Mercurial > repos > shellac > guppy_basecaller

annotate env/lib/python3.7/site-packages/jinja2/nodes.py @ 0:26e78fe6e8c4 draft

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"planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
author shellac
date Sat, 02 May 2020 07:14:21 -0400
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0
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1 # -*- coding: utf-8 -*-
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2 """AST nodes generated by the parser for the compiler. Also provides
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3 some node tree helper functions used by the parser and compiler in order
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4 to normalize nodes.
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5 """
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6 import operator
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7 from collections import deque
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8
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9 from markupsafe import Markup
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10
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11 from ._compat import izip
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12 from ._compat import PY2
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13 from ._compat import text_type
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14 from ._compat import with_metaclass
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15
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16 _binop_to_func = {
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17 "*": operator.mul,
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18 "/": operator.truediv,
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19 "//": operator.floordiv,
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20 "**": operator.pow,
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21 "%": operator.mod,
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22 "+": operator.add,
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23 "-": operator.sub,
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24 }
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25
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26 _uaop_to_func = {"not": operator.not_, "+": operator.pos, "-": operator.neg}
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27
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28 _cmpop_to_func = {
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29 "eq": operator.eq,
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30 "ne": operator.ne,
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31 "gt": operator.gt,
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32 "gteq": operator.ge,
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33 "lt": operator.lt,
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34 "lteq": operator.le,
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35 "in": lambda a, b: a in b,
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36 "notin": lambda a, b: a not in b,
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37 }
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38
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39
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40 class Impossible(Exception):
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41 """Raised if the node could not perform a requested action."""
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42
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43
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44 class NodeType(type):
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45 """A metaclass for nodes that handles the field and attribute
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46 inheritance. fields and attributes from the parent class are
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47 automatically forwarded to the child."""
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48
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49 def __new__(mcs, name, bases, d):
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50 for attr in "fields", "attributes":
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51 storage = []
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52 storage.extend(getattr(bases[0], attr, ()))
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53 storage.extend(d.get(attr, ()))
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54 assert len(bases) == 1, "multiple inheritance not allowed"
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55 assert len(storage) == len(set(storage)), "layout conflict"
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56 d[attr] = tuple(storage)
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57 d.setdefault("abstract", False)
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58 return type.__new__(mcs, name, bases, d)
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59
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60
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61 class EvalContext(object):
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62 """Holds evaluation time information. Custom attributes can be attached
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63 to it in extensions.
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64 """
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65
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66 def __init__(self, environment, template_name=None):
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67 self.environment = environment
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68 if callable(environment.autoescape):
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69 self.autoescape = environment.autoescape(template_name)
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70 else:
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71 self.autoescape = environment.autoescape
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72 self.volatile = False
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73
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74 def save(self):
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75 return self.__dict__.copy()
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76
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77 def revert(self, old):
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78 self.__dict__.clear()
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79 self.__dict__.update(old)
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80
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81
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82 def get_eval_context(node, ctx):
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83 if ctx is None:
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84 if node.environment is None:
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85 raise RuntimeError(
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86 "if no eval context is passed, the "
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87 "node must have an attached "
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88 "environment."
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89 )
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90 return EvalContext(node.environment)
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91 return ctx
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92
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93
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94 class Node(with_metaclass(NodeType, object)):
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95 """Baseclass for all Jinja nodes. There are a number of nodes available
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96 of different types. There are four major types:
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97
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98 - :class:`Stmt`: statements
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99 - :class:`Expr`: expressions
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100 - :class:`Helper`: helper nodes
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101 - :class:`Template`: the outermost wrapper node
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102
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103 All nodes have fields and attributes. Fields may be other nodes, lists,
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104 or arbitrary values. Fields are passed to the constructor as regular
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105 positional arguments, attributes as keyword arguments. Each node has
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106 two attributes: `lineno` (the line number of the node) and `environment`.
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107 The `environment` attribute is set at the end of the parsing process for
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108 all nodes automatically.
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109 """
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110
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111 fields = ()
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112 attributes = ("lineno", "environment")
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113 abstract = True
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114
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115 def __init__(self, *fields, **attributes):
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116 if self.abstract:
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117 raise TypeError("abstract nodes are not instantiable")
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118 if fields:
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119 if len(fields) != len(self.fields):
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120 if not self.fields:
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121 raise TypeError("%r takes 0 arguments" % self.__class__.__name__)
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122 raise TypeError(
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123 "%r takes 0 or %d argument%s"
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124 % (
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125 self.__class__.__name__,
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126 len(self.fields),
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127 len(self.fields) != 1 and "s" or "",
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128 )
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129 )
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130 for name, arg in izip(self.fields, fields):
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131 setattr(self, name, arg)
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132 for attr in self.attributes:
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133 setattr(self, attr, attributes.pop(attr, None))
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134 if attributes:
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135 raise TypeError("unknown attribute %r" % next(iter(attributes)))
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136
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137 def iter_fields(self, exclude=None, only=None):
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138 """This method iterates over all fields that are defined and yields
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139 ``(key, value)`` tuples. Per default all fields are returned, but
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140 it's possible to limit that to some fields by providing the `only`
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141 parameter or to exclude some using the `exclude` parameter. Both
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142 should be sets or tuples of field names.
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143 """
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144 for name in self.fields:
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145 if (
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146 (exclude is only is None)
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147 or (exclude is not None and name not in exclude)
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148 or (only is not None and name in only)
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149 ):
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150 try:
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151 yield name, getattr(self, name)
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152 except AttributeError:
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153 pass
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154
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155 def iter_child_nodes(self, exclude=None, only=None):
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156 """Iterates over all direct child nodes of the node. This iterates
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157 over all fields and yields the values of they are nodes. If the value
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158 of a field is a list all the nodes in that list are returned.
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159 """
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160 for _, item in self.iter_fields(exclude, only):
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161 if isinstance(item, list):
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162 for n in item:
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163 if isinstance(n, Node):
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164 yield n
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165 elif isinstance(item, Node):
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166 yield item
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167
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168 def find(self, node_type):
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169 """Find the first node of a given type. If no such node exists the
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170 return value is `None`.
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171 """
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172 for result in self.find_all(node_type):
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173 return result
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174
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175 def find_all(self, node_type):
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176 """Find all the nodes of a given type. If the type is a tuple,
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177 the check is performed for any of the tuple items.
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178 """
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179 for child in self.iter_child_nodes():
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180 if isinstance(child, node_type):
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181 yield child
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182 for result in child.find_all(node_type):
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183 yield result
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184
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185 def set_ctx(self, ctx):
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186 """Reset the context of a node and all child nodes. Per default the
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187 parser will all generate nodes that have a 'load' context as it's the
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188 most common one. This method is used in the parser to set assignment
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189 targets and other nodes to a store context.
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190 """
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191 todo = deque([self])
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192 while todo:
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193 node = todo.popleft()
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194 if "ctx" in node.fields:
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195 node.ctx = ctx
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196 todo.extend(node.iter_child_nodes())
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197 return self
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198
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199 def set_lineno(self, lineno, override=False):
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200 """Set the line numbers of the node and children."""
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201 todo = deque([self])
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202 while todo:
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203 node = todo.popleft()
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204 if "lineno" in node.attributes:
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205 if node.lineno is None or override:
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206 node.lineno = lineno
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207 todo.extend(node.iter_child_nodes())
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208 return self
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209
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210 def set_environment(self, environment):
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211 """Set the environment for all nodes."""
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212 todo = deque([self])
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213 while todo:
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214 node = todo.popleft()
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215 node.environment = environment
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216 todo.extend(node.iter_child_nodes())
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217 return self
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218
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219 def __eq__(self, other):
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220 return type(self) is type(other) and tuple(self.iter_fields()) == tuple(
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221 other.iter_fields()
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222 )
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223
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224 def __ne__(self, other):
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225 return not self.__eq__(other)
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226
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227 # Restore Python 2 hashing behavior on Python 3
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228 __hash__ = object.__hash__
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229
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230 def __repr__(self):
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231 return "%s(%s)" % (
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232 self.__class__.__name__,
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233 ", ".join("%s=%r" % (arg, getattr(self, arg, None)) for arg in self.fields),
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234 )
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235
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236 def dump(self):
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237 def _dump(node):
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238 if not isinstance(node, Node):
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239 buf.append(repr(node))
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240 return
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241
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242 buf.append("nodes.%s(" % node.__class__.__name__)
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243 if not node.fields:
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244 buf.append(")")
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245 return
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246 for idx, field in enumerate(node.fields):
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247 if idx:
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248 buf.append(", ")
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249 value = getattr(node, field)
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250 if isinstance(value, list):
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251 buf.append("[")
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252 for idx, item in enumerate(value):
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253 if idx:
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254 buf.append(", ")
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255 _dump(item)
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256 buf.append("]")
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257 else:
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258 _dump(value)
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259 buf.append(")")
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260
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261 buf = []
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262 _dump(self)
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263 return "".join(buf)
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264
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265
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266 class Stmt(Node):
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267 """Base node for all statements."""
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268
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269 abstract = True
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270
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271
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272 class Helper(Node):
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273 """Nodes that exist in a specific context only."""
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274
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275 abstract = True
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276
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277
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278 class Template(Node):
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279 """Node that represents a template. This must be the outermost node that
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280 is passed to the compiler.
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281 """
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282
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283 fields = ("body",)
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284
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285
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286 class Output(Stmt):
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287 """A node that holds multiple expressions which are then printed out.
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288 This is used both for the `print` statement and the regular template data.
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289 """
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290
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291 fields = ("nodes",)
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292
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293
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294 class Extends(Stmt):
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295 """Represents an extends statement."""
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296
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297 fields = ("template",)
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298
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299
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300 class For(Stmt):
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301 """The for loop. `target` is the target for the iteration (usually a
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302 :class:`Name` or :class:`Tuple`), `iter` the iterable. `body` is a list
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303 of nodes that are used as loop-body, and `else_` a list of nodes for the
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304 `else` block. If no else node exists it has to be an empty list.
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305
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306 For filtered nodes an expression can be stored as `test`, otherwise `None`.
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307 """
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308
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309 fields = ("target", "iter", "body", "else_", "test", "recursive")
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310
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311
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312 class If(Stmt):
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313 """If `test` is true, `body` is rendered, else `else_`."""
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314
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315 fields = ("test", "body", "elif_", "else_")
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316
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317
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318 class Macro(Stmt):
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319 """A macro definition. `name` is the name of the macro, `args` a list of
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320 arguments and `defaults` a list of defaults if there are any. `body` is
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321 a list of nodes for the macro body.
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322 """
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323
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324 fields = ("name", "args", "defaults", "body")
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325
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326
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327 class CallBlock(Stmt):
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328 """Like a macro without a name but a call instead. `call` is called with
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329 the unnamed macro as `caller` argument this node holds.
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330 """
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331
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332 fields = ("call", "args", "defaults", "body")
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333
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334
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335 class FilterBlock(Stmt):
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336 """Node for filter sections."""
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337
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338 fields = ("body", "filter")
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339
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340
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341 class With(Stmt):
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342 """Specific node for with statements. In older versions of Jinja the
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343 with statement was implemented on the base of the `Scope` node instead.
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344
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345 .. versionadded:: 2.9.3
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346 """
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347
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348 fields = ("targets", "values", "body")
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349
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350
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351 class Block(Stmt):
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352 """A node that represents a block."""
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353
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354 fields = ("name", "body", "scoped")
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355
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356
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357 class Include(Stmt):
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358 """A node that represents the include tag."""
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359
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360 fields = ("template", "with_context", "ignore_missing")
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361
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362
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363 class Import(Stmt):
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364 """A node that represents the import tag."""
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365
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366 fields = ("template", "target", "with_context")
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367
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368
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369 class FromImport(Stmt):
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370 """A node that represents the from import tag. It's important to not
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371 pass unsafe names to the name attribute. The compiler translates the
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372 attribute lookups directly into getattr calls and does *not* use the
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373 subscript callback of the interface. As exported variables may not
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374 start with double underscores (which the parser asserts) this is not a
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375 problem for regular Jinja code, but if this node is used in an extension
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376 extra care must be taken.
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377
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378 The list of names may contain tuples if aliases are wanted.
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379 """
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380
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381 fields = ("template", "names", "with_context")
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382
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383
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384 class ExprStmt(Stmt):
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385 """A statement that evaluates an expression and discards the result."""
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386
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387 fields = ("node",)
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388
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389
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390 class Assign(Stmt):
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391 """Assigns an expression to a target."""
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392
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393 fields = ("target", "node")
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394
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parents:
diff changeset
395
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parents:
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396 class AssignBlock(Stmt):
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parents:
diff changeset
397 """Assigns a block to a target."""
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parents:
diff changeset
398
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parents:
diff changeset
399 fields = ("target", "filter", "body")
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parents:
diff changeset
400
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parents:
diff changeset
401
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parents:
diff changeset
402 class Expr(Node):
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parents:
diff changeset
403 """Baseclass for all expressions."""
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parents:
diff changeset
404
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parents:
diff changeset
405 abstract = True
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parents:
diff changeset
406
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parents:
diff changeset
407 def as_const(self, eval_ctx=None):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
408 """Return the value of the expression as constant or raise
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
409 :exc:`Impossible` if this was not possible.
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parents:
diff changeset
410
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parents:
diff changeset
411 An :class:`EvalContext` can be provided, if none is given
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parents:
diff changeset
412 a default context is created which requires the nodes to have
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parents:
diff changeset
413 an attached environment.
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parents:
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414
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parents:
diff changeset
415 .. versionchanged:: 2.4
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parents:
diff changeset
416 the `eval_ctx` parameter was added.
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parents:
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417 """
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parents:
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418 raise Impossible()
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parents:
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419
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parents:
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420 def can_assign(self):
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parents:
diff changeset
421 """Check if it's possible to assign something to this node."""
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parents:
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422 return False
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parents:
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423
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parents:
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424
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parents:
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425 class BinExpr(Expr):
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parents:
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426 """Baseclass for all binary expressions."""
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parents:
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427
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parents:
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428 fields = ("left", "right")
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parents:
diff changeset
429 operator = None
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parents:
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430 abstract = True
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parents:
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431
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parents:
diff changeset
432 def as_const(self, eval_ctx=None):
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parents:
diff changeset
433 eval_ctx = get_eval_context(self, eval_ctx)
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parents:
diff changeset
434 # intercepted operators cannot be folded at compile time
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parents:
diff changeset
435 if (
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
436 self.environment.sandboxed
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
437 and self.operator in self.environment.intercepted_binops
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parents:
diff changeset
438 ):
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parents:
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439 raise Impossible()
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parents:
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440 f = _binop_to_func[self.operator]
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parents:
diff changeset
441 try:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
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442 return f(self.left.as_const(eval_ctx), self.right.as_const(eval_ctx))
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
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443 except Exception:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
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444 raise Impossible()
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
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445
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parents:
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446
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parents:
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447 class UnaryExpr(Expr):
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parents:
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448 """Baseclass for all unary expressions."""
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parents:
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449
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450 fields = ("node",)
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parents:
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451 operator = None
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parents:
diff changeset
452 abstract = True
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parents:
diff changeset
453
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parents:
diff changeset
454 def as_const(self, eval_ctx=None):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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diff changeset
455 eval_ctx = get_eval_context(self, eval_ctx)
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parents:
diff changeset
456 # intercepted operators cannot be folded at compile time
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parents:
diff changeset
457 if (
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
458 self.environment.sandboxed
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parents:
diff changeset
459 and self.operator in self.environment.intercepted_unops
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parents:
diff changeset
460 ):
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parents:
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461 raise Impossible()
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parents:
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462 f = _uaop_to_func[self.operator]
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parents:
diff changeset
463 try:
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parents:
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464 return f(self.node.as_const(eval_ctx))
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
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465 except Exception:
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parents:
diff changeset
466 raise Impossible()
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
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467
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parents:
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468
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parents:
diff changeset
469 class Name(Expr):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
470 """Looks up a name or stores a value in a name.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
471 The `ctx` of the node can be one of the following values:
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parents:
diff changeset
472
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parents:
diff changeset
473 - `store`: store a value in the name
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parents:
diff changeset
474 - `load`: load that name
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
475 - `param`: like `store` but if the name was defined as function parameter.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
476 """
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
477
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parents:
diff changeset
478 fields = ("name", "ctx")
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parents:
diff changeset
479
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parents:
diff changeset
480 def can_assign(self):
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parents:
diff changeset
481 return self.name not in ("true", "false", "none", "True", "False", "None")
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parents:
diff changeset
482
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
483
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
484 class NSRef(Expr):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
485 """Reference to a namespace value assignment"""
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
486
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parents:
diff changeset
487 fields = ("name", "attr")
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parents:
diff changeset
488
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
489 def can_assign(self):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
490 # We don't need any special checks here; NSRef assignments have a
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
491 # runtime check to ensure the target is a namespace object which will
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
492 # have been checked already as it is created using a normal assignment
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
493 # which goes through a `Name` node.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
494 return True
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
495
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
496
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parents:
diff changeset
497 class Literal(Expr):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
498 """Baseclass for literals."""
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parents:
diff changeset
499
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parents:
diff changeset
500 abstract = True
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
501
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
502
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
503 class Const(Literal):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
504 """All constant values. The parser will return this node for simple
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
505 constants such as ``42`` or ``"foo"`` but it can be used to store more
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
506 complex values such as lists too. Only constants with a safe
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
507 representation (objects where ``eval(repr(x)) == x`` is true).
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
508 """
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
509
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
510 fields = ("value",)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
511
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parents:
diff changeset
512 def as_const(self, eval_ctx=None):
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parents:
diff changeset
513 rv = self.value
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parents:
diff changeset
514 if (
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
515 PY2
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
516 and type(rv) is text_type
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
517 and self.environment.policies["compiler.ascii_str"]
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
518 ):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
519 try:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
520 rv = rv.encode("ascii")
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
521 except UnicodeError:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
522 pass
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
523 return rv
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
524
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
525 @classmethod
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
526 def from_untrusted(cls, value, lineno=None, environment=None):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
527 """Return a const object if the value is representable as
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
528 constant value in the generated code, otherwise it will raise
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diff changeset
529 an `Impossible` exception.
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parents:
diff changeset
530 """
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parents:
diff changeset
531 from .compiler import has_safe_repr
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532
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diff changeset
533 if not has_safe_repr(value):
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parents:
diff changeset
534 raise Impossible()
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
535 return cls(value, lineno=lineno, environment=environment)
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536
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537
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538 class TemplateData(Literal):
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diff changeset
539 """A constant template string."""
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diff changeset
540
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541 fields = ("data",)
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542
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diff changeset
543 def as_const(self, eval_ctx=None):
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diff changeset
544 eval_ctx = get_eval_context(self, eval_ctx)
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diff changeset
545 if eval_ctx.volatile:
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diff changeset
546 raise Impossible()
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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547 if eval_ctx.autoescape:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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diff changeset
548 return Markup(self.data)
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diff changeset
549 return self.data
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550
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551
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552 class Tuple(Literal):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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diff changeset
553 """For loop unpacking and some other things like multiple arguments
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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diff changeset
554 for subscripts. Like for :class:`Name` `ctx` specifies if the tuple
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
555 is used for loading the names or storing.
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parents:
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556 """
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557
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558 fields = ("items", "ctx")
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559
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parents:
diff changeset
560 def as_const(self, eval_ctx=None):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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diff changeset
561 eval_ctx = get_eval_context(self, eval_ctx)
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562 return tuple(x.as_const(eval_ctx) for x in self.items)
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563
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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564 def can_assign(self):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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565 for item in self.items:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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diff changeset
566 if not item.can_assign():
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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567 return False
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
568 return True
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569
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570
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parents:
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571 class List(Literal):
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572 """Any list literal such as ``[1, 2, 3]``"""
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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573
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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574 fields = ("items",)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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575
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diff changeset
576 def as_const(self, eval_ctx=None):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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diff changeset
577 eval_ctx = get_eval_context(self, eval_ctx)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
578 return [x.as_const(eval_ctx) for x in self.items]
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parents:
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579
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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580
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
581 class Dict(Literal):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
582 """Any dict literal such as ``{1: 2, 3: 4}``. The items must be a list of
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
583 :class:`Pair` nodes.
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parents:
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584 """
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diff changeset
585
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diff changeset
586 fields = ("items",)
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587
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diff changeset
588 def as_const(self, eval_ctx=None):
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parents:
diff changeset
589 eval_ctx = get_eval_context(self, eval_ctx)
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diff changeset
590 return dict(x.as_const(eval_ctx) for x in self.items)
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diff changeset
591
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
592
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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593 class Pair(Helper):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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diff changeset
594 """A key, value pair for dicts."""
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parents:
diff changeset
595
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
596 fields = ("key", "value")
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diff changeset
597
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parents:
diff changeset
598 def as_const(self, eval_ctx=None):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
599 eval_ctx = get_eval_context(self, eval_ctx)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
600 return self.key.as_const(eval_ctx), self.value.as_const(eval_ctx)
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diff changeset
601
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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diff changeset
602
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
603 class Keyword(Helper):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
604 """A key, value pair for keyword arguments where key is a string."""
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
605
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
606 fields = ("key", "value")
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
607
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
608 def as_const(self, eval_ctx=None):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
609 eval_ctx = get_eval_context(self, eval_ctx)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
610 return self.key, self.value.as_const(eval_ctx)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
611
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
612
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
613 class CondExpr(Expr):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
614 """A conditional expression (inline if expression). (``{{
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
615 foo if bar else baz }}``)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
616 """
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
617
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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diff changeset
618 fields = ("test", "expr1", "expr2")
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
619
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
620 def as_const(self, eval_ctx=None):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
621 eval_ctx = get_eval_context(self, eval_ctx)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
622 if self.test.as_const(eval_ctx):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
623 return self.expr1.as_const(eval_ctx)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
624
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
625 # if we evaluate to an undefined object, we better do that at runtime
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
626 if self.expr2 is None:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
627 raise Impossible()
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
628
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
629 return self.expr2.as_const(eval_ctx)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
630
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
631
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
632 def args_as_const(node, eval_ctx):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
633 args = [x.as_const(eval_ctx) for x in node.args]
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
634 kwargs = dict(x.as_const(eval_ctx) for x in node.kwargs)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
635
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
636 if node.dyn_args is not None:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
637 try:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
638 args.extend(node.dyn_args.as_const(eval_ctx))
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
639 except Exception:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
640 raise Impossible()
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
641
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
642 if node.dyn_kwargs is not None:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
643 try:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
644 kwargs.update(node.dyn_kwargs.as_const(eval_ctx))
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
645 except Exception:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
646 raise Impossible()
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
647
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
648 return args, kwargs
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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diff changeset
649
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
650
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
651 class Filter(Expr):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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diff changeset
652 """This node applies a filter on an expression. `name` is the name of
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
653 the filter, the rest of the fields are the same as for :class:`Call`.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
654
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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diff changeset
655 If the `node` of a filter is `None` the contents of the last buffer are
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
656 filtered. Buffers are created by macros and filter blocks.
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parents:
diff changeset
657 """
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
658
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
diff changeset
659 fields = ("node", "name", "args", "kwargs", "dyn_args", "dyn_kwargs")
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
660
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
661 def as_const(self, eval_ctx=None):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
662 eval_ctx = get_eval_context(self, eval_ctx)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
663
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
664 if eval_ctx.volatile or self.node is None:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
665 raise Impossible()
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
666
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
667 # we have to be careful here because we call filter_ below.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
668 # if this variable would be called filter, 2to3 would wrap the
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
669 # call in a list because it is assuming we are talking about the
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
670 # builtin filter function here which no longer returns a list in
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
671 # python 3. because of that, do not rename filter_ to filter!
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
672 filter_ = self.environment.filters.get(self.name)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
673
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
674 if filter_ is None or getattr(filter_, "contextfilter", False) is True:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
675 raise Impossible()
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
676
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
677 # We cannot constant handle async filters, so we need to make sure
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
678 # to not go down this path.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
679 if eval_ctx.environment.is_async and getattr(
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
680 filter_, "asyncfiltervariant", False
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
681 ):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
682 raise Impossible()
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
683
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
684 args, kwargs = args_as_const(self, eval_ctx)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
685 args.insert(0, self.node.as_const(eval_ctx))
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
686
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
687 if getattr(filter_, "evalcontextfilter", False) is True:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
688 args.insert(0, eval_ctx)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
689 elif getattr(filter_, "environmentfilter", False) is True:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
690 args.insert(0, self.environment)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
691
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
692 try:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
693 return filter_(*args, **kwargs)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
694 except Exception:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
695 raise Impossible()
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
696
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
697
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
698 class Test(Expr):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
699 """Applies a test on an expression. `name` is the name of the test, the
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
700 rest of the fields are the same as for :class:`Call`.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
701 """
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
702
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
703 fields = ("node", "name", "args", "kwargs", "dyn_args", "dyn_kwargs")
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
704
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
705 def as_const(self, eval_ctx=None):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
706 test = self.environment.tests.get(self.name)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
707
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
708 if test is None:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
709 raise Impossible()
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
710
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
711 eval_ctx = get_eval_context(self, eval_ctx)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
712 args, kwargs = args_as_const(self, eval_ctx)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
713 args.insert(0, self.node.as_const(eval_ctx))
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
714
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
715 try:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
716 return test(*args, **kwargs)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
717 except Exception:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
718 raise Impossible()
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
719
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
720
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
721 class Call(Expr):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
722 """Calls an expression. `args` is a list of arguments, `kwargs` a list
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
723 of keyword arguments (list of :class:`Keyword` nodes), and `dyn_args`
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
724 and `dyn_kwargs` has to be either `None` or a node that is used as
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
725 node for dynamic positional (``*args``) or keyword (``**kwargs``)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
726 arguments.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
727 """
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
728
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
729 fields = ("node", "args", "kwargs", "dyn_args", "dyn_kwargs")
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
730
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
731
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
732 class Getitem(Expr):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
733 """Get an attribute or item from an expression and prefer the item."""
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
734
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
735 fields = ("node", "arg", "ctx")
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
736
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
737 def as_const(self, eval_ctx=None):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
738 eval_ctx = get_eval_context(self, eval_ctx)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
739 if self.ctx != "load":
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
740 raise Impossible()
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
741 try:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
742 return self.environment.getitem(
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
743 self.node.as_const(eval_ctx), self.arg.as_const(eval_ctx)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
744 )
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
745 except Exception:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
746 raise Impossible()
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
747
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
748 def can_assign(self):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
749 return False
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
750
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
751
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
752 class Getattr(Expr):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
753 """Get an attribute or item from an expression that is a ascii-only
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
754 bytestring and prefer the attribute.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
755 """
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
756
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
757 fields = ("node", "attr", "ctx")
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
758
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
759 def as_const(self, eval_ctx=None):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
760 if self.ctx != "load":
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
761 raise Impossible()
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
762 try:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
763 eval_ctx = get_eval_context(self, eval_ctx)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
764 return self.environment.getattr(self.node.as_const(eval_ctx), self.attr)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
765 except Exception:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
766 raise Impossible()
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
767
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
768 def can_assign(self):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
769 return False
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
770
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
771
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
772 class Slice(Expr):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
773 """Represents a slice object. This must only be used as argument for
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
774 :class:`Subscript`.
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
775 """
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
776
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
777 fields = ("start", "stop", "step")
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
778
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
779 def as_const(self, eval_ctx=None):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
780 eval_ctx = get_eval_context(self, eval_ctx)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
781
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
782 def const(obj):
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
783 if obj is None:
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
784 return None
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
785 return obj.as_const(eval_ctx)
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
786
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
787 return slice(const(self.start), const(self.stop), const(self.step))
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
788
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
shellac
parents:
diff changeset
789
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790 class Concat(Expr):
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791 """Concatenates the list of expressions provided after converting them to
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792 unicode.
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793 """
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parents:
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794
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795 fields = ("nodes",)
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796
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797 def as_const(self, eval_ctx=None):
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diff changeset
798 eval_ctx = get_eval_context(self, eval_ctx)
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parents:
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799 return "".join(text_type(x.as_const(eval_ctx)) for x in self.nodes)
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parents:
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800
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parents:
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801
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parents:
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802 class Compare(Expr):
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803 """Compares an expression with some other expressions. `ops` must be a
26e78fe6e8c4 "planemo upload commit c699937486c35866861690329de38ec1a5d9f783"
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parents:
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804 list of :class:`Operand`\\s.
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parents:
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805 """
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806
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807 fields = ("expr", "ops")
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808
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809 def as_const(self, eval_ctx=None):
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810 eval_ctx = get_eval_context(self, eval_ctx)
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diff changeset
811 result = value = self.expr.as_const(eval_ctx)
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parents:
diff changeset
812
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parents:
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813 try:
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parents:
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814 for op in self.ops:
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diff changeset
815 new_value = op.expr.as_const(eval_ctx)
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diff changeset
816 result = _cmpop_to_func[op.op](value, new_value)
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817
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818 if not result:
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819 return False
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820
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821 value = new_value
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822 except Exception:
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parents:
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823 raise Impossible()
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824
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825 return result
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parents:
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826
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827
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828 class Operand(Helper):
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829 """Holds an operator and an expression."""
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830
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831 fields = ("op", "expr")
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832
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833
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834 if __debug__:
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835 Operand.__doc__ += "\nThe following operators are available: " + ", ".join(
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parents:
diff changeset
836 sorted(
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parents:
diff changeset
837 "``%s``" % x
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parents:
diff changeset
838 for x in set(_binop_to_func) | set(_uaop_to_func) | set(_cmpop_to_func)
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diff changeset
839 )
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840 )
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parents:
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841
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parents:
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842
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parents:
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843 class Mul(BinExpr):
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diff changeset
844 """Multiplies the left with the right node."""
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845
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846 operator = "*"
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847
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parents:
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848
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parents:
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849 class Div(BinExpr):
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parents:
diff changeset
850 """Divides the left by the right node."""
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parents:
diff changeset
851
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852 operator = "/"
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parents:
diff changeset
853
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parents:
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854
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parents:
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855 class FloorDiv(BinExpr):
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parents:
diff changeset
856 """Divides the left by the right node and truncates conver the
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parents:
diff changeset
857 result into an integer by truncating.
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parents:
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858 """
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parents:
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859
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parents:
diff changeset
860 operator = "//"
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parents:
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861
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parents:
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862
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parents:
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863 class Add(BinExpr):
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parents:
diff changeset
864 """Add the left to the right node."""
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parents:
diff changeset
865
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parents:
diff changeset
866 operator = "+"
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parents:
diff changeset
867
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parents:
diff changeset
868
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parents:
diff changeset
869 class Sub(BinExpr):
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parents:
diff changeset
870 """Subtract the right from the left node."""
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parents:
diff changeset
871
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parents:
diff changeset
872 operator = "-"
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parents:
diff changeset
873
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parents:
diff changeset
874
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parents:
diff changeset
875 class Mod(BinExpr):
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parents:
diff changeset
876 """Left modulo right."""
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parents:
diff changeset
877
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parents:
diff changeset
878 operator = "%"
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parents:
diff changeset
879
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parents:
diff changeset
880
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diff changeset
881 class Pow(BinExpr):
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parents:
diff changeset
882 """Left to the power of right."""
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parents:
diff changeset
883
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parents:
diff changeset
884 operator = "**"
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parents:
diff changeset
885
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parents:
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886
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diff changeset
887 class And(BinExpr):
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parents:
diff changeset
888 """Short circuited AND."""
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parents:
diff changeset
889
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diff changeset
890 operator = "and"
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parents:
diff changeset
891
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diff changeset
892 def as_const(self, eval_ctx=None):
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parents:
diff changeset
893 eval_ctx = get_eval_context(self, eval_ctx)
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parents:
diff changeset
894 return self.left.as_const(eval_ctx) and self.right.as_const(eval_ctx)
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parents:
diff changeset
895
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parents:
diff changeset
896
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parents:
diff changeset
897 class Or(BinExpr):
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parents:
diff changeset
898 """Short circuited OR."""
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parents:
diff changeset
899
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parents:
diff changeset
900 operator = "or"
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parents:
diff changeset
901
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diff changeset
902 def as_const(self, eval_ctx=None):
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diff changeset
903 eval_ctx = get_eval_context(self, eval_ctx)
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parents:
diff changeset
904 return self.left.as_const(eval_ctx) or self.right.as_const(eval_ctx)
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parents:
diff changeset
905
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parents:
diff changeset
906
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parents:
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907 class Not(UnaryExpr):
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parents:
diff changeset
908 """Negate the expression."""
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parents:
diff changeset
909
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parents:
diff changeset
910 operator = "not"
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parents:
diff changeset
911
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parents:
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912
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parents:
diff changeset
913 class Neg(UnaryExpr):
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parents:
diff changeset
914 """Make the expression negative."""
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parents:
diff changeset
915
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parents:
diff changeset
916 operator = "-"
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parents:
diff changeset
917
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parents:
diff changeset
918
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parents:
diff changeset
919 class Pos(UnaryExpr):
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parents:
diff changeset
920 """Make the expression positive (noop for most expressions)"""
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parents:
diff changeset
921
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parents:
diff changeset
922 operator = "+"
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parents:
diff changeset
923
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parents:
diff changeset
924
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925 # Helpers for extensions
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926
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927
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928 class EnvironmentAttribute(Expr):
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diff changeset
929 """Loads an attribute from the environment object. This is useful for
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930 extensions that want to call a callback stored on the environment.
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931 """
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932
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933 fields = ("name",)
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934
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935
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936 class ExtensionAttribute(Expr):
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parents:
diff changeset
937 """Returns the attribute of an extension bound to the environment.
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parents:
diff changeset
938 The identifier is the identifier of the :class:`Extension`.
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939
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940 This node is usually constructed by calling the
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diff changeset
941 :meth:`~jinja2.ext.Extension.attr` method on an extension.
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942 """
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943
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944 fields = ("identifier", "name")
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diff changeset
945
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diff changeset
946
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diff changeset
947 class ImportedName(Expr):
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diff changeset
948 """If created with an import name the import name is returned on node
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parents:
diff changeset
949 access. For example ``ImportedName('cgi.escape')`` returns the `escape`
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parents:
diff changeset
950 function from the cgi module on evaluation. Imports are optimized by the
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diff changeset
951 compiler so there is no need to assign them to local variables.
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952 """
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953
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954 fields = ("importname",)
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955
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956
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957 class InternalName(Expr):
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958 """An internal name in the compiler. You cannot create these nodes
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959 yourself but the parser provides a
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960 :meth:`~jinja2.parser.Parser.free_identifier` method that creates
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diff changeset
961 a new identifier for you. This identifier is not available from the
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parents:
diff changeset
962 template and is not threated specially by the compiler.
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diff changeset
963 """
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parents:
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964
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diff changeset
965 fields = ("name",)
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diff changeset
966
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967 def __init__(self):
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968 raise TypeError(
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969 "Can't create internal names. Use the "
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970 "`free_identifier` method on a parser."
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parents:
diff changeset
971 )
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972
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973
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974 class MarkSafe(Expr):
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975 """Mark the wrapped expression as safe (wrap it as `Markup`)."""
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976
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977 fields = ("expr",)
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978
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979 def as_const(self, eval_ctx=None):
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980 eval_ctx = get_eval_context(self, eval_ctx)
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981 return Markup(self.expr.as_const(eval_ctx))
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diff changeset
982
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983
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984 class MarkSafeIfAutoescape(Expr):
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diff changeset
985 """Mark the wrapped expression as safe (wrap it as `Markup`) but
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diff changeset
986 only if autoescaping is active.
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diff changeset
987
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988 .. versionadded:: 2.5
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989 """
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diff changeset
990
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diff changeset
991 fields = ("expr",)
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diff changeset
992
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993 def as_const(self, eval_ctx=None):
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diff changeset
994 eval_ctx = get_eval_context(self, eval_ctx)
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995 if eval_ctx.volatile:
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diff changeset
996 raise Impossible()
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diff changeset
997 expr = self.expr.as_const(eval_ctx)
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diff changeset
998 if eval_ctx.autoescape:
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parents:
diff changeset
999 return Markup(expr)
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diff changeset
1000 return expr
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diff changeset
1001
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diff changeset
1002
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1003 class ContextReference(Expr):
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diff changeset
1004 """Returns the current template context. It can be used like a
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diff changeset
1005 :class:`Name` node, with a ``'load'`` ctx and will return the
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diff changeset
1006 current :class:`~jinja2.runtime.Context` object.
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diff changeset
1007
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diff changeset
1008 Here an example that assigns the current template name to a
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diff changeset
1009 variable named `foo`::
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diff changeset
1010
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1011 Assign(Name('foo', ctx='store'),
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diff changeset
1012 Getattr(ContextReference(), 'name'))
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1013
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1014 This is basically equivalent to using the
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diff changeset
1015 :func:`~jinja2.contextfunction` decorator when using the
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diff changeset
1016 high-level API, which causes a reference to the context to be passed
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parents:
diff changeset
1017 as the first argument to a function.
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diff changeset
1018 """
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diff changeset
1019
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diff changeset
1020
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1021 class DerivedContextReference(Expr):
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diff changeset
1022 """Return the current template context including locals. Behaves
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parents:
diff changeset
1023 exactly like :class:`ContextReference`, but includes local
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diff changeset
1024 variables, such as from a ``for`` loop.
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diff changeset
1025
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diff changeset
1026 .. versionadded:: 2.11
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diff changeset
1027 """
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parents:
diff changeset
1028
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diff changeset
1029
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diff changeset
1030 class Continue(Stmt):
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diff changeset
1031 """Continue a loop."""
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diff changeset
1032
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diff changeset
1033
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diff changeset
1034 class Break(Stmt):
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diff changeset
1035 """Break a loop."""
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1036
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1037
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1038 class Scope(Stmt):
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diff changeset
1039 """An artificial scope."""
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diff changeset
1040
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1041 fields = ("body",)
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diff changeset
1042
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diff changeset
1043
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diff changeset
1044 class OverlayScope(Stmt):
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diff changeset
1045 """An overlay scope for extensions. This is a largely unoptimized scope
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parents:
diff changeset
1046 that however can be used to introduce completely arbitrary variables into
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parents:
diff changeset
1047 a sub scope from a dictionary or dictionary like object. The `context`
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parents:
diff changeset
1048 field has to evaluate to a dictionary object.
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diff changeset
1049
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1050 Example usage::
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1051
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1052 OverlayScope(context=self.call_method('get_context'),
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parents:
diff changeset
1053 body=[...])
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diff changeset
1054
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diff changeset
1055 .. versionadded:: 2.10
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1056 """
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1057
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1058 fields = ("context", "body")
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1059
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1060
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1061 class EvalContextModifier(Stmt):
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1062 """Modifies the eval context. For each option that should be modified,
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1063 a :class:`Keyword` has to be added to the :attr:`options` list.
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1064
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1065 Example to change the `autoescape` setting::
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1066
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1067 EvalContextModifier(options=[Keyword('autoescape', Const(True))])
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1068 """
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1069
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1070 fields = ("options",)
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1071
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1072
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1073 class ScopedEvalContextModifier(EvalContextModifier):
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1074 """Modifies the eval context and reverts it later. Works exactly like
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1075 :class:`EvalContextModifier` but will only modify the
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1076 :class:`~jinja2.nodes.EvalContext` for nodes in the :attr:`body`.
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1077 """
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1078
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1079 fields = ("body",)
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1080
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1081
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1082 # make sure nobody creates custom nodes
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1083 def _failing_new(*args, **kwargs):
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1084 raise TypeError("can't create custom node types")
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1085
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1086
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1087 NodeType.__new__ = staticmethod(_failing_new)
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1088 del _failing_new