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annotate planemo/lib/python3.7/site-packages/boltons/funcutils.py @ 0:d30785e31577 draft

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"planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
author guerler
date Fri, 31 Jul 2020 00:18:57 -0400
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1 # -*- coding: utf-8 -*-
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2 """Python's built-in :mod:`functools` module builds several useful
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3 utilities on top of Python's first-class function
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4 support. ``funcutils`` generally stays in the same vein, adding to and
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5 correcting Python's standard metaprogramming facilities.
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6 """
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7 from __future__ import print_function
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8
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9 import sys
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10 import re
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11 import inspect
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12 import functools
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13 import itertools
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14 from types import MethodType, FunctionType
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15
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16 try:
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17 xrange
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18 make_method = MethodType
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19 except NameError:
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20 # Python 3
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21 make_method = lambda desc, obj, obj_type: MethodType(desc, obj)
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22 basestring = (str, bytes) # Python 3 compat
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23 _IS_PY2 = False
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24 else:
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25 _IS_PY2 = True
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26
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27
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28 try:
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29 _inspect_iscoroutinefunction = inspect.iscoroutinefunction
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30 except AttributeError:
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31 # Python 3.4
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32 _inspect_iscoroutinefunction = lambda func: False
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33
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34
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35 try:
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36 from boltons.typeutils import make_sentinel
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37 NO_DEFAULT = make_sentinel(var_name='NO_DEFAULT')
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38 except ImportError:
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39 NO_DEFAULT = object()
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40
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41 try:
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42 from functools import partialmethod
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43 except ImportError:
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44 partialmethod = None
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45
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46
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47 _IS_PY35 = sys.version_info >= (3, 5)
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48 if not _IS_PY35:
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49 # py35+ wants you to use signature instead, but
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50 # inspect_formatargspec is way simpler for what it is. Copied the
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51 # vendoring approach from alembic:
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52 # https://github.com/sqlalchemy/alembic/blob/4cdad6aec32b4b5573a2009cc356cb4b144bd359/alembic/util/compat.py#L92
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53 from inspect import formatargspec as inspect_formatargspec
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54 else:
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55 from inspect import formatannotation
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56
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57 def inspect_formatargspec(
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58 args, varargs=None, varkw=None, defaults=None,
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59 kwonlyargs=(), kwonlydefaults={}, annotations={},
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60 formatarg=str,
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61 formatvarargs=lambda name: '*' + name,
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62 formatvarkw=lambda name: '**' + name,
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63 formatvalue=lambda value: '=' + repr(value),
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64 formatreturns=lambda text: ' -> ' + text,
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65 formatannotation=formatannotation):
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66 """Copy formatargspec from python 3.7 standard library.
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67 Python 3 has deprecated formatargspec and requested that Signature
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68 be used instead, however this requires a full reimplementation
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69 of formatargspec() in terms of creating Parameter objects and such.
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70 Instead of introducing all the object-creation overhead and having
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71 to reinvent from scratch, just copy their compatibility routine.
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72 """
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73
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74 def formatargandannotation(arg):
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75 result = formatarg(arg)
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76 if arg in annotations:
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77 result += ': ' + formatannotation(annotations[arg])
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78 return result
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79 specs = []
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80 if defaults:
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81 firstdefault = len(args) - len(defaults)
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82 for i, arg in enumerate(args):
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83 spec = formatargandannotation(arg)
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84 if defaults and i >= firstdefault:
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85 spec = spec + formatvalue(defaults[i - firstdefault])
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86 specs.append(spec)
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87 if varargs is not None:
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88 specs.append(formatvarargs(formatargandannotation(varargs)))
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89 else:
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90 if kwonlyargs:
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91 specs.append('*')
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92 if kwonlyargs:
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93 for kwonlyarg in kwonlyargs:
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94 spec = formatargandannotation(kwonlyarg)
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95 if kwonlydefaults and kwonlyarg in kwonlydefaults:
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96 spec += formatvalue(kwonlydefaults[kwonlyarg])
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97 specs.append(spec)
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98 if varkw is not None:
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99 specs.append(formatvarkw(formatargandannotation(varkw)))
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100 result = '(' + ', '.join(specs) + ')'
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101 if 'return' in annotations:
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102 result += formatreturns(formatannotation(annotations['return']))
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103 return result
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104
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105
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106 def get_module_callables(mod, ignore=None):
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107 """Returns two maps of (*types*, *funcs*) from *mod*, optionally
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108 ignoring based on the :class:`bool` return value of the *ignore*
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109 callable. *mod* can be a string name of a module in
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110 :data:`sys.modules` or the module instance itself.
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111 """
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112 if isinstance(mod, basestring):
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113 mod = sys.modules[mod]
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114 types, funcs = {}, {}
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115 for attr_name in dir(mod):
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116 if ignore and ignore(attr_name):
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117 continue
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118 try:
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119 attr = getattr(mod, attr_name)
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120 except Exception:
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121 continue
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122 try:
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123 attr_mod_name = attr.__module__
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124 except AttributeError:
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125 continue
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126 if attr_mod_name != mod.__name__:
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127 continue
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128 if isinstance(attr, type):
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129 types[attr_name] = attr
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130 elif callable(attr):
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131 funcs[attr_name] = attr
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132 return types, funcs
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133
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134
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135 def mro_items(type_obj):
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136 """Takes a type and returns an iterator over all class variables
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137 throughout the type hierarchy (respecting the MRO).
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138
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139 >>> sorted(set([k for k, v in mro_items(int) if not k.startswith('__') and 'bytes' not in k and not callable(v)]))
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140 ['denominator', 'imag', 'numerator', 'real']
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141 """
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142 # TODO: handle slots?
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143 return itertools.chain.from_iterable(ct.__dict__.items()
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144 for ct in type_obj.__mro__)
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145
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146
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147 def dir_dict(obj, raise_exc=False):
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148 """Return a dictionary of attribute names to values for a given
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149 object. Unlike ``obj.__dict__``, this function returns all
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150 attributes on the object, including ones on parent classes.
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151 """
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152 # TODO: separate function for handling descriptors on types?
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153 ret = {}
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154 for k in dir(obj):
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155 try:
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156 ret[k] = getattr(obj, k)
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157 except Exception:
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158 if raise_exc:
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159 raise
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160 return ret
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161
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162
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163 def copy_function(orig, copy_dict=True):
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164 """Returns a shallow copy of the function, including code object,
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165 globals, closure, etc.
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166
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167 >>> func = lambda: func
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168 >>> func() is func
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169 True
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170 >>> func_copy = copy_function(func)
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171 >>> func_copy() is func
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172 True
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173 >>> func_copy is not func
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174 True
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175
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176 Args:
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177 orig (function): The function to be copied. Must be a
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178 function, not just any method or callable.
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179 copy_dict (bool): Also copy any attributes set on the function
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180 instance. Defaults to ``True``.
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181 """
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182 ret = FunctionType(orig.__code__,
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183 orig.__globals__,
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184 name=orig.__name__,
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185 argdefs=getattr(orig, "__defaults__", None),
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186 closure=getattr(orig, "__closure__", None))
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187 if copy_dict:
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188 ret.__dict__.update(orig.__dict__)
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189 return ret
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190
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191
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192 def partial_ordering(cls):
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193 """Class decorator, similar to :func:`functools.total_ordering`,
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194 except it is used to define `partial orderings`_ (i.e., it is
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195 possible that *x* is neither greater than, equal to, or less than
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196 *y*). It assumes the presence of the ``__le__()`` and ``__ge__()``
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197 method, but nothing else. It will not override any existing
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198 additional comparison methods.
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199
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200 .. _partial orderings: https://en.wikipedia.org/wiki/Partially_ordered_set
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201
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202 >>> @partial_ordering
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203 ... class MySet(set):
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204 ... def __le__(self, other):
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205 ... return self.issubset(other)
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206 ... def __ge__(self, other):
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207 ... return self.issuperset(other)
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208 ...
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209 >>> a = MySet([1,2,3])
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210 >>> b = MySet([1,2])
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211 >>> c = MySet([1,2,4])
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212 >>> b < a
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213 True
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214 >>> b > a
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215 False
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216 >>> b < c
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217 True
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218 >>> a < c
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219 False
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220 >>> c > a
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221 False
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222 """
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223 def __lt__(self, other): return self <= other and not self >= other
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224 def __gt__(self, other): return self >= other and not self <= other
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225 def __eq__(self, other): return self >= other and self <= other
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226
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227 if not hasattr(cls, '__lt__'): cls.__lt__ = __lt__
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228 if not hasattr(cls, '__gt__'): cls.__gt__ = __gt__
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229 if not hasattr(cls, '__eq__'): cls.__eq__ = __eq__
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230
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231 return cls
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232
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233
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234 class InstancePartial(functools.partial):
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235 """:class:`functools.partial` is a huge convenience for anyone
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236 working with Python's great first-class functions. It allows
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237 developers to curry arguments and incrementally create simpler
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238 callables for a variety of use cases.
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239
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240 Unfortunately there's one big gap in its usefulness:
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241 methods. Partials just don't get bound as methods and
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242 automatically handed a reference to ``self``. The
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243 ``InstancePartial`` type remedies this by inheriting from
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244 :class:`functools.partial` and implementing the necessary
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245 descriptor protocol. There are no other differences in
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246 implementation or usage. :class:`CachedInstancePartial`, below,
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247 has the same ability, but is slightly more efficient.
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248
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249 """
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250 if partialmethod is not None: # NB: See https://github.com/mahmoud/boltons/pull/244
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251 @property
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252 def _partialmethod(self):
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253 return partialmethod(self.func, *self.args, **self.keywords)
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254
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255 def __get__(self, obj, obj_type):
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256 return make_method(self, obj, obj_type)
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257
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258
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259
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260 class CachedInstancePartial(functools.partial):
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261 """The ``CachedInstancePartial`` is virtually the same as
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262 :class:`InstancePartial`, adding support for method-usage to
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263 :class:`functools.partial`, except that upon first access, it
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264 caches the bound method on the associated object, speeding it up
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265 for future accesses, and bringing the method call overhead to
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266 about the same as non-``partial`` methods.
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267
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268 See the :class:`InstancePartial` docstring for more details.
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269 """
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270 if partialmethod is not None: # NB: See https://github.com/mahmoud/boltons/pull/244
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271 @property
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272 def _partialmethod(self):
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273 return partialmethod(self.func, *self.args, **self.keywords)
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274
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275 def __get__(self, obj, obj_type):
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276 # These assignments could've been in __init__, but there was
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277 # no simple way to do it without breaking one of PyPy or Py3.
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278 self.__name__ = None
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279 self.__doc__ = self.func.__doc__
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280 self.__module__ = self.func.__module__
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281
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282 name = self.__name__
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283 if name is None:
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284 for k, v in mro_items(obj_type):
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285 if v is self:
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286 self.__name__ = name = k
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287 if obj is None:
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288 return make_method(self, obj, obj_type)
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289 try:
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290 # since this is a data descriptor, this block
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291 # is probably only hit once (per object)
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292 return obj.__dict__[name]
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293 except KeyError:
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294 obj.__dict__[name] = ret = make_method(self, obj, obj_type)
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295 return ret
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296
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297
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298 partial = CachedInstancePartial
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299
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300
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301 def format_invocation(name='', args=(), kwargs=None):
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302 """Given a name, positional arguments, and keyword arguments, format
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303 a basic Python-style function call.
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304
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305 >>> print(format_invocation('func', args=(1, 2), kwargs={'c': 3}))
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306 func(1, 2, c=3)
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307 >>> print(format_invocation('a_func', args=(1,)))
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308 a_func(1)
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309 >>> print(format_invocation('kw_func', kwargs=[('a', 1), ('b', 2)]))
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310 kw_func(a=1, b=2)
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311
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312 """
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313 kwargs = kwargs or {}
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314 a_text = ', '.join([repr(a) for a in args])
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315 if isinstance(kwargs, dict):
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316 kwarg_items = [(k, kwargs[k]) for k in sorted(kwargs)]
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317 else:
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318 kwarg_items = kwargs
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319 kw_text = ', '.join(['%s=%r' % (k, v) for k, v in kwarg_items])
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320
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321 all_args_text = a_text
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322 if all_args_text and kw_text:
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323 all_args_text += ', '
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324 all_args_text += kw_text
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325
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326 return '%s(%s)' % (name, all_args_text)
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327
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328
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329 def format_exp_repr(obj, pos_names, req_names=None, opt_names=None, opt_key=None):
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330 """Render an expression-style repr of an object, based on attribute
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331 names, which are assumed to line up with arguments to an initializer.
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332
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333 >>> class Flag(object):
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334 ... def __init__(self, length, width, depth=None):
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335 ... self.length = length
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336 ... self.width = width
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337 ... self.depth = depth
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338 ...
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339
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340 That's our Flag object, here are some example reprs for it:
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341
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342 >>> flag = Flag(5, 10)
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343 >>> print(format_exp_repr(flag, ['length', 'width'], [], ['depth']))
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344 Flag(5, 10)
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345 >>> flag2 = Flag(5, 15, 2)
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346 >>> print(format_exp_repr(flag2, ['length'], ['width', 'depth']))
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347 Flag(5, width=15, depth=2)
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348
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349 By picking the pos_names, req_names, opt_names, and opt_key, you
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350 can fine-tune how you want the repr to look.
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351
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352 Args:
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353 obj (object): The object whose type name will be used and
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354 attributes will be checked
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355 pos_names (list): Required list of attribute names which will be
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356 rendered as positional arguments in the output repr.
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357 req_names (list): List of attribute names which will always
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358 appear in the keyword arguments in the output repr. Defaults to None.
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359 opt_names (list): List of attribute names which may appear in
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360 the keyword arguments in the output repr, provided they pass
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361 the *opt_key* check. Defaults to None.
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362 opt_key (callable): A function or callable which checks whether
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363 an opt_name should be in the repr. Defaults to a
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364 ``None``-check.
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365
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366 """
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367 cn = obj.__class__.__name__
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368 req_names = req_names or []
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369 opt_names = opt_names or []
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370 uniq_names, all_names = set(), []
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371 for name in req_names + opt_names:
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372 if name in uniq_names:
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373 continue
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374 uniq_names.add(name)
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375 all_names.append(name)
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376
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377 if opt_key is None:
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378 opt_key = lambda v: v is None
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379 assert callable(opt_key)
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380
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381 args = [getattr(obj, name, None) for name in pos_names]
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382
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383 kw_items = [(name, getattr(obj, name, None)) for name in all_names]
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384 kw_items = [(name, val) for name, val in kw_items
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385 if not (name in opt_names and opt_key(val))]
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386
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387 return format_invocation(cn, args, kw_items)
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388
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389
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390 def format_nonexp_repr(obj, req_names=None, opt_names=None, opt_key=None):
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391 """Format a non-expression-style repr
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392
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393 Some object reprs look like object instantiation, e.g., App(r=[], mw=[]).
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394
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395 This makes sense for smaller, lower-level objects whose state
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396 roundtrips. But a lot of objects contain values that don't
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397 roundtrip, like types and functions.
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398
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399 For those objects, there is the non-expression style repr, which
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400 mimic's Python's default style to make a repr like so:
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401
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402 >>> class Flag(object):
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403 ... def __init__(self, length, width, depth=None):
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404 ... self.length = length
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405 ... self.width = width
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406 ... self.depth = depth
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407 ...
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408 >>> flag = Flag(5, 10)
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409 >>> print(format_nonexp_repr(flag, ['length', 'width'], ['depth']))
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410 <Flag length=5 width=10>
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411
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412 If no attributes are specified or set, utilizes the id, not unlike Python's
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413 built-in behavior.
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414
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415 >>> print(format_nonexp_repr(flag))
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416 <Flag id=...>
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417 """
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418 cn = obj.__class__.__name__
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419 req_names = req_names or []
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420 opt_names = opt_names or []
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421 uniq_names, all_names = set(), []
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422 for name in req_names + opt_names:
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423 if name in uniq_names:
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424 continue
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425 uniq_names.add(name)
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426 all_names.append(name)
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427
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428 if opt_key is None:
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429 opt_key = lambda v: v is None
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430 assert callable(opt_key)
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431
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432 items = [(name, getattr(obj, name, None)) for name in all_names]
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433 labels = ['%s=%r' % (name, val) for name, val in items
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434 if not (name in opt_names and opt_key(val))]
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435 if not labels:
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436 labels = ['id=%s' % id(obj)]
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437 ret = '<%s %s>' % (cn, ' '.join(labels))
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438 return ret
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439
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440
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441
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442 # # #
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443 # # # Function builder
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444 # # #
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445
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446
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447 def wraps(func, injected=None, expected=None, **kw):
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448 """Decorator factory to apply update_wrapper() to a wrapper function.
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449
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450 Modeled after built-in :func:`functools.wraps`. Returns a decorator
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451 that invokes update_wrapper() with the decorated function as the wrapper
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452 argument and the arguments to wraps() as the remaining arguments.
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453 Default arguments are as for update_wrapper(). This is a convenience
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454 function to simplify applying partial() to update_wrapper().
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455
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456 Same example as in update_wrapper's doc but with wraps:
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457
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458 >>> from boltons.funcutils import wraps
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459 >>>
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460 >>> def print_return(func):
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461 ... @wraps(func)
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462 ... def wrapper(*args, **kwargs):
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463 ... ret = func(*args, **kwargs)
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464 ... print(ret)
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465 ... return ret
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466 ... return wrapper
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467 ...
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468 >>> @print_return
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469 ... def example():
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470 ... '''docstring'''
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471 ... return 'example return value'
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472 >>>
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473 >>> val = example()
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474 example return value
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475 >>> example.__name__
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476 'example'
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477 >>> example.__doc__
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478 'docstring'
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479 """
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480 return partial(update_wrapper, func=func, build_from=None,
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481 injected=injected, expected=expected, **kw)
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482
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483
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484 def update_wrapper(wrapper, func, injected=None, expected=None, build_from=None, **kw):
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485 """Modeled after the built-in :func:`functools.update_wrapper`,
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486 this function is used to make your wrapper function reflect the
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487 wrapped function's:
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488
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489 * Name
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490 * Documentation
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491 * Module
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492 * Signature
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493
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494 The built-in :func:`functools.update_wrapper` copies the first three, but
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495 does not copy the signature. This version of ``update_wrapper`` can copy
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496 the inner function's signature exactly, allowing seamless usage
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497 and :mod:`introspection <inspect>`. Usage is identical to the
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498 built-in version::
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499
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500 >>> from boltons.funcutils import update_wrapper
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501 >>>
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502 >>> def print_return(func):
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503 ... def wrapper(*args, **kwargs):
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504 ... ret = func(*args, **kwargs)
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505 ... print(ret)
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506 ... return ret
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507 ... return update_wrapper(wrapper, func)
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508 ...
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509 >>> @print_return
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510 ... def example():
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511 ... '''docstring'''
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512 ... return 'example return value'
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513 >>>
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514 >>> val = example()
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515 example return value
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516 >>> example.__name__
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517 'example'
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518 >>> example.__doc__
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519 'docstring'
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520
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521 In addition, the boltons version of update_wrapper supports
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522 modifying the outer signature. By passing a list of
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523 *injected* argument names, those arguments will be removed from
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524 the outer wrapper's signature, allowing your decorator to provide
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guerler
parents:
diff changeset
525 arguments that aren't passed in.
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guerler
parents:
diff changeset
526
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
527 Args:
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
528
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parents:
diff changeset
529 wrapper (function) : The callable to which the attributes of
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
530 *func* are to be copied.
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
531 func (function): The callable whose attributes are to be copied.
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guerler
parents:
diff changeset
532 injected (list): An optional list of argument names which
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parents:
diff changeset
533 should not appear in the new wrapper's signature.
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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parents:
diff changeset
534 expected (list): An optional list of argument names (or (name,
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
535 default) pairs) representing new arguments introduced by
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
536 the wrapper (the opposite of *injected*). See
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
537 :meth:`FunctionBuilder.add_arg()` for more details.
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
538 build_from (function): The callable from which the new wrapper
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
539 is built. Defaults to *func*, unless *wrapper* is partial object
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guerler
parents:
diff changeset
540 built from *func*, in which case it defaults to *wrapper*.
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guerler
parents:
diff changeset
541 Useful in some specific cases where *wrapper* and *func* have the
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
542 same arguments but differ on which are keyword-only and positional-only.
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parents:
diff changeset
543 update_dict (bool): Whether to copy other, non-standard
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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parents:
diff changeset
544 attributes of *func* over to the wrapper. Defaults to True.
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guerler
parents:
diff changeset
545 inject_to_varkw (bool): Ignore missing arguments when a
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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parents:
diff changeset
546 ``**kwargs``-type catch-all is present. Defaults to True.
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parents:
diff changeset
547 hide_wrapped (bool): Remove reference to the wrapped function(s)
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parents:
diff changeset
548 in the updated function.
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diff changeset
549
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parents:
diff changeset
550 In opposition to the built-in :func:`functools.update_wrapper` bolton's
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diff changeset
551 version returns a copy of the function and does not modifiy anything in place.
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parents:
diff changeset
552 For more in-depth wrapping of functions, see the
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
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553 :class:`FunctionBuilder` type, on which update_wrapper was built.
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parents:
diff changeset
554 """
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parents:
diff changeset
555 if injected is None:
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diff changeset
556 injected = []
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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diff changeset
557 elif isinstance(injected, basestring):
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diff changeset
558 injected = [injected]
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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diff changeset
559 else:
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diff changeset
560 injected = list(injected)
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diff changeset
561
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562 expected_items = _parse_wraps_expected(expected)
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guerler
parents:
diff changeset
563
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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564 if isinstance(func, (classmethod, staticmethod)):
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
565 raise TypeError('wraps does not support wrapping classmethods and'
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
566 ' staticmethods, change the order of wrapping to'
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
567 ' wrap the underlying function: %r'
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
568 % (getattr(func, '__func__', None),))
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parents:
diff changeset
569
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570 update_dict = kw.pop('update_dict', True)
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571 inject_to_varkw = kw.pop('inject_to_varkw', True)
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572 hide_wrapped = kw.pop('hide_wrapped', False)
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diff changeset
573 if kw:
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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574 raise TypeError('unexpected kwargs: %r' % kw.keys())
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diff changeset
575
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diff changeset
576 if isinstance(wrapper, functools.partial) and func is wrapper.func:
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diff changeset
577 build_from = build_from or wrapper
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diff changeset
578
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diff changeset
579 fb = FunctionBuilder.from_func(build_from or func)
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diff changeset
580
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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581 for arg in injected:
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diff changeset
582 try:
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parents:
diff changeset
583 fb.remove_arg(arg)
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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parents:
diff changeset
584 except MissingArgument:
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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diff changeset
585 if inject_to_varkw and fb.varkw is not None:
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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diff changeset
586 continue # keyword arg will be caught by the varkw
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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parents:
diff changeset
587 raise
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parents:
diff changeset
588
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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diff changeset
589 for arg, default in expected_items:
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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diff changeset
590 fb.add_arg(arg, default) # may raise ExistingArgument
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guerler
parents:
diff changeset
591
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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diff changeset
592 if fb.is_async:
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diff changeset
593 fb.body = 'return await _call(%s)' % fb.get_invocation_str()
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
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diff changeset
594 else:
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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parents:
diff changeset
595 fb.body = 'return _call(%s)' % fb.get_invocation_str()
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guerler
parents:
diff changeset
596
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guerler
parents:
diff changeset
597 execdict = dict(_call=wrapper, _func=func)
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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diff changeset
598 fully_wrapped = fb.get_func(execdict, with_dict=update_dict)
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
599
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
600 if hide_wrapped and hasattr(fully_wrapped, '__wrapped__'):
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
601 del fully_wrapped.__dict__['__wrapped__']
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
602 elif not hide_wrapped:
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
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diff changeset
603 fully_wrapped.__wrapped__ = func # ref to the original function (#115)
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
604
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
605 return fully_wrapped
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
606
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
607
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
608 def _parse_wraps_expected(expected):
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
609 # expected takes a pretty powerful argument, it's processed
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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parents:
diff changeset
610 # here. admittedly this would be less trouble if I relied on
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
611 # OrderedDict (there's an impl of that in the commit history if
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
612 # you look
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
613 if expected is None:
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
614 expected = []
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
615 elif isinstance(expected, basestring):
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
616 expected = [(expected, NO_DEFAULT)]
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
617
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
618 expected_items = []
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
619 try:
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
620 expected_iter = iter(expected)
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
621 except TypeError as e:
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
622 raise ValueError('"expected" takes string name, sequence of string names,'
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
623 ' iterable of (name, default) pairs, or a mapping of '
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
624 ' {name: default}, not %r (got: %r)' % (expected, e))
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
625 for argname in expected_iter:
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
626 if isinstance(argname, basestring):
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
627 # dict keys and bare strings
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
628 try:
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
629 default = expected[argname]
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
630 except TypeError:
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
631 default = NO_DEFAULT
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
632 else:
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
633 # pairs
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
634 try:
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
635 argname, default = argname
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
636 except (TypeError, ValueError):
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
637 raise ValueError('"expected" takes string name, sequence of string names,'
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
638 ' iterable of (name, default) pairs, or a mapping of '
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
639 ' {name: default}, not %r')
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
640 if not isinstance(argname, basestring):
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
641 raise ValueError('all "expected" argnames must be strings, not %r' % (argname,))
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
642
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
643 expected_items.append((argname, default))
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
644
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
645 return expected_items
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
646
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
647
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
648 class FunctionBuilder(object):
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
649 """The FunctionBuilder type provides an interface for programmatically
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
650 creating new functions, either based on existing functions or from
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
651 scratch.
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
652
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
653 Values are passed in at construction or set as attributes on the
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
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diff changeset
654 instance. For creating a new function based of an existing one,
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655 see the :meth:`~FunctionBuilder.from_func` classmethod. At any
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656 point, :meth:`~FunctionBuilder.get_func` can be called to get a
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657 newly compiled function, based on the values configured.
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658
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659 >>> fb = FunctionBuilder('return_five', doc='returns the integer 5',
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660 ... body='return 5')
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661 >>> f = fb.get_func()
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662 >>> f()
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663 5
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664 >>> fb.varkw = 'kw'
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665 >>> f_kw = fb.get_func()
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666 >>> f_kw(ignored_arg='ignored_val')
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667 5
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668
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669 Note that function signatures themselves changed quite a bit in
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670 Python 3, so several arguments are only applicable to
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671 FunctionBuilder in Python 3. Except for *name*, all arguments to
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672 the constructor are keyword arguments.
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673
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674 Args:
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675 name (str): Name of the function.
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676 doc (str): `Docstring`_ for the function, defaults to empty.
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677 module (str): Name of the module from which this function was
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678 imported. Defaults to None.
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679 body (str): String version of the code representing the body
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680 of the function. Defaults to ``'pass'``, which will result
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681 in a function which does nothing and returns ``None``.
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682 args (list): List of argument names, defaults to empty list,
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683 denoting no arguments.
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684 varargs (str): Name of the catch-all variable for positional
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685 arguments. E.g., "args" if the resultant function is to have
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686 ``*args`` in the signature. Defaults to None.
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687 varkw (str): Name of the catch-all variable for keyword
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688 arguments. E.g., "kwargs" if the resultant function is to have
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689 ``**kwargs`` in the signature. Defaults to None.
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690 defaults (tuple): A tuple containing default argument values for
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691 those arguments that have defaults.
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692 kwonlyargs (list): Argument names which are only valid as
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693 keyword arguments. **Python 3 only.**
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694 kwonlydefaults (dict): A mapping, same as normal *defaults*,
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695 but only for the *kwonlyargs*. **Python 3 only.**
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696 annotations (dict): Mapping of type hints and so
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697 forth. **Python 3 only.**
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698 filename (str): The filename that will appear in
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699 tracebacks. Defaults to "boltons.funcutils.FunctionBuilder".
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700 indent (int): Number of spaces with which to indent the
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701 function *body*. Values less than 1 will result in an error.
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702 dict (dict): Any other attributes which should be added to the
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703 functions compiled with this FunctionBuilder.
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704
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705 All of these arguments are also made available as attributes which
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706 can be mutated as necessary.
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707
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708 .. _Docstring: https://en.wikipedia.org/wiki/Docstring#Python
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709
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710 """
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711
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712 if _IS_PY2:
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713 _argspec_defaults = {'args': list,
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714 'varargs': lambda: None,
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715 'varkw': lambda: None,
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716 'defaults': lambda: None}
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717
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718 @classmethod
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diff changeset
719 def _argspec_to_dict(cls, f):
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720 args, varargs, varkw, defaults = inspect.getargspec(f)
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721 return {'args': args,
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722 'varargs': varargs,
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diff changeset
723 'varkw': varkw,
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724 'defaults': defaults}
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725
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726 else:
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727 _argspec_defaults = {'args': list,
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728 'varargs': lambda: None,
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729 'varkw': lambda: None,
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diff changeset
730 'defaults': lambda: None,
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731 'kwonlyargs': list,
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732 'kwonlydefaults': dict,
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733 'annotations': dict}
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734
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735 @classmethod
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diff changeset
736 def _argspec_to_dict(cls, f):
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737 argspec = inspect.getfullargspec(f)
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738 return dict((attr, getattr(argspec, attr))
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739 for attr in cls._argspec_defaults)
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740
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741 _defaults = {'doc': str,
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diff changeset
742 'dict': dict,
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diff changeset
743 'is_async': lambda: False,
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744 'module': lambda: None,
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745 'body': lambda: 'pass',
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746 'indent': lambda: 4,
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747 "annotations": dict,
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748 'filename': lambda: 'boltons.funcutils.FunctionBuilder'}
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749
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750 _defaults.update(_argspec_defaults)
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751
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752 _compile_count = itertools.count()
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753
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754 def __init__(self, name, **kw):
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755 self.name = name
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756 for a, default_factory in self._defaults.items():
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757 val = kw.pop(a, None)
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758 if val is None:
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759 val = default_factory()
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760 setattr(self, a, val)
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761
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762 if kw:
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763 raise TypeError('unexpected kwargs: %r' % kw.keys())
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764 return
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765
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766 # def get_argspec(self): # TODO
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767
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768 if _IS_PY2:
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769 def get_sig_str(self, with_annotations=True):
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770 """Return function signature as a string.
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771
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772 with_annotations is ignored on Python 2. On Python 3 signature
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773 will omit annotations if it is set to False.
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774 """
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775 return inspect_formatargspec(self.args, self.varargs,
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776 self.varkw, [])
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777
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778 def get_invocation_str(self):
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779 return inspect_formatargspec(self.args, self.varargs,
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780 self.varkw, [])[1:-1]
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781 else:
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782 def get_sig_str(self, with_annotations=True):
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783 """Return function signature as a string.
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784
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diff changeset
785 with_annotations is ignored on Python 2. On Python 3 signature
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diff changeset
786 will omit annotations if it is set to False.
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787 """
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788 if with_annotations:
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diff changeset
789 annotations = self.annotations
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790 else:
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diff changeset
791 annotations = {}
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792
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793 return inspect_formatargspec(self.args,
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diff changeset
794 self.varargs,
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diff changeset
795 self.varkw,
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796 [],
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diff changeset
797 self.kwonlyargs,
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798 {},
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799 annotations)
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800
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801 _KWONLY_MARKER = re.compile(r"""
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diff changeset
802 \* # a star
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diff changeset
803 \s* # followed by any amount of whitespace
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804 , # followed by a comma
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805 \s* # followed by any amount of whitespace
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diff changeset
806 """, re.VERBOSE)
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807
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808 def get_invocation_str(self):
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809 kwonly_pairs = None
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810 formatters = {}
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811 if self.kwonlyargs:
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812 kwonly_pairs = dict((arg, arg)
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813 for arg in self.kwonlyargs)
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814 formatters['formatvalue'] = lambda value: '=' + value
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815
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816 sig = inspect_formatargspec(self.args,
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817 self.varargs,
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818 self.varkw,
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819 [],
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820 kwonly_pairs,
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821 kwonly_pairs,
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822 {},
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823 **formatters)
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824 sig = self._KWONLY_MARKER.sub('', sig)
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825 return sig[1:-1]
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826
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827 @classmethod
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828 def from_func(cls, func):
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diff changeset
829 """Create a new FunctionBuilder instance based on an existing
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diff changeset
830 function. The original function will not be stored or
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diff changeset
831 modified.
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832 """
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diff changeset
833 # TODO: copy_body? gonna need a good signature regex.
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diff changeset
834 # TODO: might worry about __closure__?
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835 if not callable(func):
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836 raise TypeError('expected callable object, not %r' % (func,))
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837
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838 if isinstance(func, functools.partial):
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839 if _IS_PY2:
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840 raise ValueError('Cannot build FunctionBuilder instances from partials in python 2.')
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841 kwargs = {'name': func.func.__name__,
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842 'doc': func.func.__doc__,
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843 'module': getattr(func.func, '__module__', None), # e.g., method_descriptor
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844 'annotations': getattr(func.func, "__annotations__", {}),
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845 'dict': getattr(func.func, '__dict__', {})}
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846 else:
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847 kwargs = {'name': func.__name__,
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848 'doc': func.__doc__,
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849 'module': getattr(func, '__module__', None), # e.g., method_descriptor
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850 'annotations': getattr(func, "__annotations__", {}),
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851 'dict': getattr(func, '__dict__', {})}
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852
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853 kwargs.update(cls._argspec_to_dict(func))
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854
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855 if _inspect_iscoroutinefunction(func):
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856 kwargs['is_async'] = True
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857
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858 return cls(**kwargs)
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859
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860 def get_func(self, execdict=None, add_source=True, with_dict=True):
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861 """Compile and return a new function based on the current values of
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
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862 the FunctionBuilder.
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863
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864 Args:
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865 execdict (dict): The dictionary representing the scope in
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866 which the compilation should take place. Defaults to an empty
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867 dict.
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868 add_source (bool): Whether to add the source used to a
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869 special ``__source__`` attribute on the resulting
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870 function. Defaults to True.
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871 with_dict (bool): Add any custom attributes, if
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872 applicable. Defaults to True.
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873
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874 To see an example of usage, see the implementation of
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875 :func:`~boltons.funcutils.wraps`.
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876 """
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877 execdict = execdict or {}
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878 body = self.body or self._default_body
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879
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880 tmpl = 'def {name}{sig_str}:'
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881 tmpl += '\n{body}'
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882
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883 if self.is_async:
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884 tmpl = 'async ' + tmpl
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885
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886 body = _indent(self.body, ' ' * self.indent)
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887
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888 name = self.name.replace('<', '_').replace('>', '_') # lambdas
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889 src = tmpl.format(name=name, sig_str=self.get_sig_str(with_annotations=False),
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890 doc=self.doc, body=body)
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891 self._compile(src, execdict)
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892 func = execdict[name]
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893
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894 func.__name__ = self.name
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895 func.__doc__ = self.doc
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896 func.__defaults__ = self.defaults
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897 if not _IS_PY2:
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898 func.__kwdefaults__ = self.kwonlydefaults
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899 func.__annotations__ = self.annotations
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900
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901 if with_dict:
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902 func.__dict__.update(self.dict)
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903 func.__module__ = self.module
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904 # TODO: caller module fallback?
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905
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906 if add_source:
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907 func.__source__ = src
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908
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909 return func
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910
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911 def get_defaults_dict(self):
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912 """Get a dictionary of function arguments with defaults and the
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913 respective values.
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914 """
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915 ret = dict(reversed(list(zip(reversed(self.args),
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diff changeset
916 reversed(self.defaults or [])))))
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
917 kwonlydefaults = getattr(self, 'kwonlydefaults', None)
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
918 if kwonlydefaults:
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
919 ret.update(kwonlydefaults)
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
920 return ret
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
921
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
922 def get_arg_names(self, only_required=False):
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
923 arg_names = tuple(self.args) + tuple(getattr(self, 'kwonlyargs', ()))
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
924 if only_required:
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
925 defaults_dict = self.get_defaults_dict()
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
926 arg_names = tuple([an for an in arg_names if an not in defaults_dict])
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
927 return arg_names
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
928
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
929 if _IS_PY2:
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
930 def add_arg(self, arg_name, default=NO_DEFAULT):
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
931 "Add an argument with optional *default* (defaults to ``funcutils.NO_DEFAULT``)."
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
932 if arg_name in self.args:
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
933 raise ExistingArgument('arg %r already in func %s arg list' % (arg_name, self.name))
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
934 self.args.append(arg_name)
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
935 if default is not NO_DEFAULT:
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
936 self.defaults = (self.defaults or ()) + (default,)
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
937 return
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
938 else:
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
939 def add_arg(self, arg_name, default=NO_DEFAULT, kwonly=False):
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
940 """Add an argument with optional *default* (defaults to
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
941 ``funcutils.NO_DEFAULT``). Pass *kwonly=True* to add a
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
942 keyword-only argument
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
943 """
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
944 if arg_name in self.args:
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
945 raise ExistingArgument('arg %r already in func %s arg list' % (arg_name, self.name))
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
946 if arg_name in self.kwonlyargs:
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
947 raise ExistingArgument('arg %r already in func %s kwonly arg list' % (arg_name, self.name))
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
948 if not kwonly:
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
949 self.args.append(arg_name)
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
950 if default is not NO_DEFAULT:
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
951 self.defaults = (self.defaults or ()) + (default,)
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
952 else:
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
953 self.kwonlyargs.append(arg_name)
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
954 if default is not NO_DEFAULT:
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
955 self.kwonlydefaults[arg_name] = default
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
956 return
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
957
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
958 def remove_arg(self, arg_name):
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
959 """Remove an argument from this FunctionBuilder's argument list. The
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
960 resulting function will have one less argument per call to
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
961 this function.
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
962
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
963 Args:
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
964 arg_name (str): The name of the argument to remove.
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
965
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
966 Raises a :exc:`ValueError` if the argument is not present.
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
967
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
968 """
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
969 args = self.args
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
970 d_dict = self.get_defaults_dict()
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
971 try:
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
972 args.remove(arg_name)
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
973 except ValueError:
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
974 try:
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
975 self.kwonlyargs.remove(arg_name)
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
976 except (AttributeError, ValueError):
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
977 # py2, or py3 and missing from both
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
978 exc = MissingArgument('arg %r not found in %s argument list:'
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
979 ' %r' % (arg_name, self.name, args))
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
980 exc.arg_name = arg_name
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
981 raise exc
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
982 else:
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
983 self.kwonlydefaults.pop(arg_name, None)
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
984 else:
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
985 d_dict.pop(arg_name, None)
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
986 self.defaults = tuple([d_dict[a] for a in args if a in d_dict])
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
987 return
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
988
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
989 def _compile(self, src, execdict):
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
990
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
991 filename = ('<%s-%d>'
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
992 % (self.filename, next(self._compile_count),))
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
993 try:
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
994 code = compile(src, filename, 'single')
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
995 exec(code, execdict)
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
996 except Exception:
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
997 raise
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
998 return execdict
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
999
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
1000
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
1001 class MissingArgument(ValueError):
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
1002 pass
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
1003
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
1004
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
1005 class ExistingArgument(ValueError):
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
1006 pass
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
1007
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
1008
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
1009 def _indent(text, margin, newline='\n', key=bool):
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
1010 "based on boltons.strutils.indent"
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
1011 indented_lines = [(margin + line if key(line) else line)
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
1012 for line in text.splitlines()]
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
1013 return newline.join(indented_lines)
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
1014
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
1015
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
1016 try:
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
1017 from functools import total_ordering # 2.7+
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
1018 except ImportError:
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
1019 # python 2.6
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
1020 def total_ordering(cls):
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
1021 """Class decorator that fills in missing comparators/ordering
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
1022 methods. Backport of :func:`functools.total_ordering` to work
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
1023 with Python 2.6.
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
1024
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
1025 Code from http://code.activestate.com/recipes/576685/
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
1026 """
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
1027 convert = {
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
1028 '__lt__': [
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
1029 ('__gt__',
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
1030 lambda self, other: not (self < other or self == other)),
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
1031 ('__le__',
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
1032 lambda self, other: self < other or self == other),
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
1033 ('__ge__',
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
1034 lambda self, other: not self < other)],
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
1035 '__le__': [
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
1036 ('__ge__',
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
1037 lambda self, other: not self <= other or self == other),
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
1038 ('__lt__',
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
1039 lambda self, other: self <= other and not self == other),
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
1040 ('__gt__',
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
1041 lambda self, other: not self <= other)],
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
1042 '__gt__': [
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
1043 ('__lt__',
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
1044 lambda self, other: not (self > other or self == other)),
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
diff changeset
1045 ('__ge__',
d30785e31577 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
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1046 lambda self, other: self > other or self == other),
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1047 ('__le__',
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1048 lambda self, other: not self > other)],
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1049 '__ge__': [
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1050 ('__le__',
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1051 lambda self, other: (not self >= other) or self == other),
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1052 ('__gt__',
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1053 lambda self, other: self >= other and not self == other),
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1054 ('__lt__',
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1055 lambda self, other: not self >= other)]
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1056 }
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1057 roots = set(dir(cls)) & set(convert)
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1058 if not roots:
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1059 raise ValueError('must define at least one ordering operation:'
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1060 ' < > <= >=')
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1061 root = max(roots) # prefer __lt__ to __le__ to __gt__ to __ge__
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1062 for opname, opfunc in convert[root]:
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1063 if opname not in roots:
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1064 opfunc.__name__ = opname
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1065 opfunc.__doc__ = getattr(int, opname).__doc__
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1066 setattr(cls, opname, opfunc)
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1067 return cls
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1068
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1069 # end funcutils.py