Mercurial > repos > shellac > guppy_basecaller

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

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
"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 from ._compat import iteritems
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2 from .visitor import NodeVisitor
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3
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4 VAR_LOAD_PARAMETER = "param"
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5 VAR_LOAD_RESOLVE = "resolve"
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6 VAR_LOAD_ALIAS = "alias"
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7 VAR_LOAD_UNDEFINED = "undefined"
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8
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9
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10 def find_symbols(nodes, parent_symbols=None):
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11 sym = Symbols(parent=parent_symbols)
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12 visitor = FrameSymbolVisitor(sym)
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13 for node in nodes:
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14 visitor.visit(node)
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15 return sym
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16
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17
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18 def symbols_for_node(node, parent_symbols=None):
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19 sym = Symbols(parent=parent_symbols)
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20 sym.analyze_node(node)
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21 return sym
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22
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23
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24 class Symbols(object):
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25 def __init__(self, parent=None, level=None):
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26 if level is None:
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27 if parent is None:
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28 level = 0
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29 else:
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30 level = parent.level + 1
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31 self.level = level
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32 self.parent = parent
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33 self.refs = {}
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34 self.loads = {}
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35 self.stores = set()
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36
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37 def analyze_node(self, node, **kwargs):
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38 visitor = RootVisitor(self)
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39 visitor.visit(node, **kwargs)
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40
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41 def _define_ref(self, name, load=None):
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42 ident = "l_%d_%s" % (self.level, name)
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43 self.refs[name] = ident
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44 if load is not None:
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45 self.loads[ident] = load
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46 return ident
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47
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48 def find_load(self, target):
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49 if target in self.loads:
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50 return self.loads[target]
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51 if self.parent is not None:
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52 return self.parent.find_load(target)
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53
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54 def find_ref(self, name):
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55 if name in self.refs:
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56 return self.refs[name]
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57 if self.parent is not None:
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58 return self.parent.find_ref(name)
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59
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60 def ref(self, name):
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61 rv = self.find_ref(name)
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62 if rv is None:
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63 raise AssertionError(
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64 "Tried to resolve a name to a reference that "
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65 "was unknown to the frame (%r)" % name
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66 )
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67 return rv
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68
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69 def copy(self):
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70 rv = object.__new__(self.__class__)
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71 rv.__dict__.update(self.__dict__)
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72 rv.refs = self.refs.copy()
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73 rv.loads = self.loads.copy()
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74 rv.stores = self.stores.copy()
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75 return rv
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76
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77 def store(self, name):
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78 self.stores.add(name)
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79
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80 # If we have not see the name referenced yet, we need to figure
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81 # out what to set it to.
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82 if name not in self.refs:
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83 # If there is a parent scope we check if the name has a
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84 # reference there. If it does it means we might have to alias
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85 # to a variable there.
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86 if self.parent is not None:
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87 outer_ref = self.parent.find_ref(name)
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88 if outer_ref is not None:
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89 self._define_ref(name, load=(VAR_LOAD_ALIAS, outer_ref))
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90 return
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91
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92 # Otherwise we can just set it to undefined.
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93 self._define_ref(name, load=(VAR_LOAD_UNDEFINED, None))
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94
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95 def declare_parameter(self, name):
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96 self.stores.add(name)
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97 return self._define_ref(name, load=(VAR_LOAD_PARAMETER, None))
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98
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99 def load(self, name):
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100 target = self.find_ref(name)
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101 if target is None:
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102 self._define_ref(name, load=(VAR_LOAD_RESOLVE, name))
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103
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104 def branch_update(self, branch_symbols):
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105 stores = {}
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106 for branch in branch_symbols:
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107 for target in branch.stores:
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108 if target in self.stores:
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109 continue
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110 stores[target] = stores.get(target, 0) + 1
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111
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112 for sym in branch_symbols:
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113 self.refs.update(sym.refs)
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114 self.loads.update(sym.loads)
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115 self.stores.update(sym.stores)
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116
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117 for name, branch_count in iteritems(stores):
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118 if branch_count == len(branch_symbols):
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119 continue
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120 target = self.find_ref(name)
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121 assert target is not None, "should not happen"
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122
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123 if self.parent is not None:
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124 outer_target = self.parent.find_ref(name)
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125 if outer_target is not None:
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126 self.loads[target] = (VAR_LOAD_ALIAS, outer_target)
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127 continue
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128 self.loads[target] = (VAR_LOAD_RESOLVE, name)
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129
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130 def dump_stores(self):
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131 rv = {}
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132 node = self
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133 while node is not None:
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134 for name in node.stores:
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135 if name not in rv:
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136 rv[name] = self.find_ref(name)
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137 node = node.parent
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138 return rv
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139
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140 def dump_param_targets(self):
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141 rv = set()
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142 node = self
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143 while node is not None:
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144 for target, (instr, _) in iteritems(self.loads):
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145 if instr == VAR_LOAD_PARAMETER:
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146 rv.add(target)
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147 node = node.parent
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148 return rv
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149
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150
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151 class RootVisitor(NodeVisitor):
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152 def __init__(self, symbols):
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153 self.sym_visitor = FrameSymbolVisitor(symbols)
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154
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155 def _simple_visit(self, node, **kwargs):
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156 for child in node.iter_child_nodes():
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157 self.sym_visitor.visit(child)
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158
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159 visit_Template = (
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160 visit_Block
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161 ) = (
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162 visit_Macro
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163 ) = (
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164 visit_FilterBlock
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165 ) = visit_Scope = visit_If = visit_ScopedEvalContextModifier = _simple_visit
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166
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167 def visit_AssignBlock(self, node, **kwargs):
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168 for child in node.body:
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169 self.sym_visitor.visit(child)
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170
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171 def visit_CallBlock(self, node, **kwargs):
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172 for child in node.iter_child_nodes(exclude=("call",)):
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173 self.sym_visitor.visit(child)
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174
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175 def visit_OverlayScope(self, node, **kwargs):
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176 for child in node.body:
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177 self.sym_visitor.visit(child)
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178
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179 def visit_For(self, node, for_branch="body", **kwargs):
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180 if for_branch == "body":
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181 self.sym_visitor.visit(node.target, store_as_param=True)
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182 branch = node.body
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183 elif for_branch == "else":
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184 branch = node.else_
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185 elif for_branch == "test":
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186 self.sym_visitor.visit(node.target, store_as_param=True)
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187 if node.test is not None:
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188 self.sym_visitor.visit(node.test)
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189 return
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190 else:
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191 raise RuntimeError("Unknown for branch")
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192 for item in branch or ():
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193 self.sym_visitor.visit(item)
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194
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195 def visit_With(self, node, **kwargs):
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196 for target in node.targets:
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197 self.sym_visitor.visit(target)
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198 for child in node.body:
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199 self.sym_visitor.visit(child)
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200
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201 def generic_visit(self, node, *args, **kwargs):
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202 raise NotImplementedError(
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203 "Cannot find symbols for %r" % node.__class__.__name__
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204 )
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205
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206
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207 class FrameSymbolVisitor(NodeVisitor):
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208 """A visitor for `Frame.inspect`."""
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209
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210 def __init__(self, symbols):
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211 self.symbols = symbols
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212
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213 def visit_Name(self, node, store_as_param=False, **kwargs):
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214 """All assignments to names go through this function."""
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215 if store_as_param or node.ctx == "param":
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216 self.symbols.declare_parameter(node.name)
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217 elif node.ctx == "store":
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218 self.symbols.store(node.name)
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219 elif node.ctx == "load":
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220 self.symbols.load(node.name)
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221
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222 def visit_NSRef(self, node, **kwargs):
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223 self.symbols.load(node.name)
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224
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225 def visit_If(self, node, **kwargs):
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226 self.visit(node.test, **kwargs)
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227
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228 original_symbols = self.symbols
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229
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230 def inner_visit(nodes):
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231 self.symbols = rv = original_symbols.copy()
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232 for subnode in nodes:
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233 self.visit(subnode, **kwargs)
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234 self.symbols = original_symbols
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235 return rv
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236
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237 body_symbols = inner_visit(node.body)
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238 elif_symbols = inner_visit(node.elif_)
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239 else_symbols = inner_visit(node.else_ or ())
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240
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241 self.symbols.branch_update([body_symbols, elif_symbols, else_symbols])
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242
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243 def visit_Macro(self, node, **kwargs):
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244 self.symbols.store(node.name)
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245
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246 def visit_Import(self, node, **kwargs):
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247 self.generic_visit(node, **kwargs)
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248 self.symbols.store(node.target)
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249
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250 def visit_FromImport(self, node, **kwargs):
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251 self.generic_visit(node, **kwargs)
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252 for name in node.names:
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253 if isinstance(name, tuple):
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254 self.symbols.store(name[1])
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255 else:
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256 self.symbols.store(name)
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257
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258 def visit_Assign(self, node, **kwargs):
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259 """Visit assignments in the correct order."""
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260 self.visit(node.node, **kwargs)
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261 self.visit(node.target, **kwargs)
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262
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263 def visit_For(self, node, **kwargs):
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264 """Visiting stops at for blocks. However the block sequence
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265 is visited as part of the outer scope.
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266 """
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267 self.visit(node.iter, **kwargs)
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268
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269 def visit_CallBlock(self, node, **kwargs):
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270 self.visit(node.call, **kwargs)
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271
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272 def visit_FilterBlock(self, node, **kwargs):
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273 self.visit(node.filter, **kwargs)
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274
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275 def visit_With(self, node, **kwargs):
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276 for target in node.values:
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277 self.visit(target)
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278
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279 def visit_AssignBlock(self, node, **kwargs):
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280 """Stop visiting at block assigns."""
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281 self.visit(node.target, **kwargs)
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282
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283 def visit_Scope(self, node, **kwargs):
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284 """Stop visiting at scopes."""
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285
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286 def visit_Block(self, node, **kwargs):
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287 """Stop visiting at blocks."""
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288
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289 def visit_OverlayScope(self, node, **kwargs):
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290 """Do not visit into overlay scopes."""