Mercurial > repos > shellac > guppy_basecaller

annotate env/lib/python3.7/site-packages/boltons/namedutils.py @ 3:758bc20232e8 draft

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"planemo upload commit 2a0fe2cc28b09e101d37293e53e82f61762262ec"
author shellac
date Thu, 14 May 2020 16:20:52 -0400
parents 26e78fe6e8c4
children
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1 # -*- coding: utf-8 -*-
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2 """\
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3 The ``namedutils`` module defines two lightweight container types:
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4 :class:`namedtuple` and :class:`namedlist`. Both are subtypes of built-in
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5 sequence types, which are very fast and efficient. They simply add
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6 named attribute accessors for specific indexes within themselves.
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7
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8 The :class:`namedtuple` is identical to the built-in
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9 :class:`collections.namedtuple`, with a couple of enhancements,
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10 including a ``__repr__`` more suitable to inheritance.
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11
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12 The :class:`namedlist` is the mutable counterpart to the
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13 :class:`namedtuple`, and is much faster and lighter-weight than
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14 full-blown :class:`object`. Consider this if you're implementing nodes
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15 in a tree, graph, or other mutable data structure. If you want an even
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16 skinnier approach, you'll probably have to look to C.
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17 """
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18
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19 from __future__ import print_function
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20
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21 import sys as _sys
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22 try:
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23 from collections import OrderedDict
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24 except ImportError:
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25 # backwards compatibility (2.6 has no OrderedDict)
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26 OrderedDict = dict
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27 from keyword import iskeyword as _iskeyword
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28 from operator import itemgetter as _itemgetter
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29
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30 try:
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31 basestring
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32 def exec_(code, global_env):
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33 exec("exec code in global_env")
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34 except NameError:
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35 basestring = (str, bytes) # Python 3 compat
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36 def exec_(code, global_env):
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37 exec(code, global_env)
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38
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39 __all__ = ['namedlist', 'namedtuple']
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40
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41 # Tiny templates
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42
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43 _repr_tmpl = '{name}=%r'
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44
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45 _imm_field_tmpl = '''\
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46 {name} = _property(_itemgetter({index:d}), doc='Alias for field {index:d}')
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47 '''
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48
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49 _m_field_tmpl = '''\
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50 {name} = _property(_itemgetter({index:d}), _itemsetter({index:d}), doc='Alias for field {index:d}')
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51 '''
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52
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53 #################################################################
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54 ### namedtuple
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55 #################################################################
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56
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57 _namedtuple_tmpl = '''\
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58 class {typename}(tuple):
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59 '{typename}({arg_list})'
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60
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61 __slots__ = ()
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62
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63 _fields = {field_names!r}
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64
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65 def __new__(_cls, {arg_list}): # TODO: tweak sig to make more extensible
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66 'Create new instance of {typename}({arg_list})'
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67 return _tuple.__new__(_cls, ({arg_list}))
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68
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69 @classmethod
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70 def _make(cls, iterable, new=_tuple.__new__, len=len):
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71 'Make a new {typename} object from a sequence or iterable'
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72 result = new(cls, iterable)
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73 if len(result) != {num_fields:d}:
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74 raise TypeError('Expected {num_fields:d}'
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75 ' arguments, got %d' % len(result))
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76 return result
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77
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78 def __repr__(self):
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79 'Return a nicely formatted representation string'
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80 tmpl = self.__class__.__name__ + '({repr_fmt})'
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81 return tmpl % self
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82
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83 def _asdict(self):
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84 'Return a new OrderedDict which maps field names to their values'
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85 return OrderedDict(zip(self._fields, self))
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86
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87 def _replace(_self, **kwds):
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88 'Return a new {typename} object replacing field(s) with new values'
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89 result = _self._make(map(kwds.pop, {field_names!r}, _self))
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90 if kwds:
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91 raise ValueError('Got unexpected field names: %r' % kwds.keys())
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92 return result
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93
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94 def __getnewargs__(self):
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95 'Return self as a plain tuple. Used by copy and pickle.'
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96 return tuple(self)
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97
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98 __dict__ = _property(_asdict)
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99
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100 def __getstate__(self):
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101 'Exclude the OrderedDict from pickling' # wat
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102 pass
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103
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104 {field_defs}
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105 '''
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106
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107 def namedtuple(typename, field_names, verbose=False, rename=False):
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108 """Returns a new subclass of tuple with named fields.
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109
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110 >>> Point = namedtuple('Point', ['x', 'y'])
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111 >>> Point.__doc__ # docstring for the new class
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112 'Point(x, y)'
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113 >>> p = Point(11, y=22) # instantiate with pos args or keywords
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114 >>> p[0] + p[1] # indexable like a plain tuple
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115 33
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116 >>> x, y = p # unpack like a regular tuple
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117 >>> x, y
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118 (11, 22)
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119 >>> p.x + p.y # fields also accessible by name
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120 33
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121 >>> d = p._asdict() # convert to a dictionary
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122 >>> d['x']
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123 11
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124 >>> Point(**d) # convert from a dictionary
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125 Point(x=11, y=22)
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126 >>> p._replace(x=100) # _replace() is like str.replace() but targets named fields
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127 Point(x=100, y=22)
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128 """
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129
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130 # Validate the field names. At the user's option, either generate an error
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131 # message or automatically replace the field name with a valid name.
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132 if isinstance(field_names, basestring):
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133 field_names = field_names.replace(',', ' ').split()
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134 field_names = [str(x) for x in field_names]
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135 if rename:
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136 seen = set()
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137 for index, name in enumerate(field_names):
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138 if (not all(c.isalnum() or c == '_' for c in name)
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139 or _iskeyword(name)
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140 or not name
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141 or name[0].isdigit()
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142 or name.startswith('_')
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143 or name in seen):
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144 field_names[index] = '_%d' % index
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145 seen.add(name)
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146 for name in [typename] + field_names:
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147 if not all(c.isalnum() or c == '_' for c in name):
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148 raise ValueError('Type names and field names can only contain '
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149 'alphanumeric characters and underscores: %r'
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150 % name)
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151 if _iskeyword(name):
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152 raise ValueError('Type names and field names cannot be a '
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153 'keyword: %r' % name)
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154 if name[0].isdigit():
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155 raise ValueError('Type names and field names cannot start with '
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156 'a number: %r' % name)
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157 seen = set()
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158 for name in field_names:
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159 if name.startswith('_') and not rename:
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160 raise ValueError('Field names cannot start with an underscore: '
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161 '%r' % name)
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162 if name in seen:
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163 raise ValueError('Encountered duplicate field name: %r' % name)
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164 seen.add(name)
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165
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166 # Fill-in the class template
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167 fmt_kw = {'typename': typename}
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168 fmt_kw['field_names'] = tuple(field_names)
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169 fmt_kw['num_fields'] = len(field_names)
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170 fmt_kw['arg_list'] = repr(tuple(field_names)).replace("'", "")[1:-1]
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171 fmt_kw['repr_fmt'] = ', '.join(_repr_tmpl.format(name=name)
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172 for name in field_names)
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173 fmt_kw['field_defs'] = '\n'.join(_imm_field_tmpl.format(index=index, name=name)
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174 for index, name in enumerate(field_names))
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175 class_definition = _namedtuple_tmpl.format(**fmt_kw)
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176
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177 if verbose:
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178 print(class_definition)
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179
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180 # Execute the template string in a temporary namespace and support
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181 # tracing utilities by setting a value for frame.f_globals['__name__']
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182 namespace = dict(_itemgetter=_itemgetter,
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183 __name__='namedtuple_%s' % typename,
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184 OrderedDict=OrderedDict,
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185 _property=property,
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186 _tuple=tuple)
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187 try:
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188 exec_(class_definition, namespace)
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189 except SyntaxError as e:
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190 raise SyntaxError(e.message + ':\n' + class_definition)
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191 result = namespace[typename]
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192
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193 # For pickling to work, the __module__ variable needs to be set to the frame
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194 # where the named tuple is created. Bypass this step in environments where
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195 # sys._getframe is not defined (Jython for example) or sys._getframe is not
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196 # defined for arguments greater than 0 (IronPython).
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197 try:
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198 frame = _sys._getframe(1)
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199 result.__module__ = frame.f_globals.get('__name__', '__main__')
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200 except (AttributeError, ValueError):
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201 pass
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202
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203 return result
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204
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205
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206 #################################################################
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207 ### namedlist
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208 #################################################################
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209
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210 _namedlist_tmpl = '''\
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211 class {typename}(list):
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212 '{typename}({arg_list})'
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213
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214 __slots__ = ()
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215
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216 _fields = {field_names!r}
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217
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218 def __new__(_cls, {arg_list}): # TODO: tweak sig to make more extensible
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219 'Create new instance of {typename}({arg_list})'
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220 return _list.__new__(_cls, ({arg_list}))
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221
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222 def __init__(self, {arg_list}): # tuple didn't need this but list does
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223 return _list.__init__(self, ({arg_list}))
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224
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225 @classmethod
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226 def _make(cls, iterable, new=_list, len=len):
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227 'Make a new {typename} object from a sequence or iterable'
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228 # why did this function exist? why not just star the
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229 # iterable like below?
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230 result = cls(*iterable)
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231 if len(result) != {num_fields:d}:
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232 raise TypeError('Expected {num_fields:d} arguments,'
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233 ' got %d' % len(result))
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234 return result
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235
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236 def __repr__(self):
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237 'Return a nicely formatted representation string'
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238 tmpl = self.__class__.__name__ + '({repr_fmt})'
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239 return tmpl % tuple(self)
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240
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241 def _asdict(self):
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242 'Return a new OrderedDict which maps field names to their values'
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243 return OrderedDict(zip(self._fields, self))
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244
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245 def _replace(_self, **kwds):
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246 'Return a new {typename} object replacing field(s) with new values'
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247 result = _self._make(map(kwds.pop, {field_names!r}, _self))
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248 if kwds:
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249 raise ValueError('Got unexpected field names: %r' % kwds.keys())
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250 return result
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251
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252 def __getnewargs__(self):
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253 'Return self as a plain list. Used by copy and pickle.'
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254 return tuple(self)
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255
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256 __dict__ = _property(_asdict)
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257
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258 def __getstate__(self):
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259 'Exclude the OrderedDict from pickling' # wat
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260 pass
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261
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262 {field_defs}
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263 '''
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264
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265
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266 def namedlist(typename, field_names, verbose=False, rename=False):
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267 """Returns a new subclass of list with named fields.
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268
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269 >>> Point = namedlist('Point', ['x', 'y'])
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270 >>> Point.__doc__ # docstring for the new class
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271 'Point(x, y)'
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272 >>> p = Point(11, y=22) # instantiate with pos args or keywords
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273 >>> p[0] + p[1] # indexable like a plain list
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274 33
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275 >>> x, y = p # unpack like a regular list
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276 >>> x, y
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277 (11, 22)
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278 >>> p.x + p.y # fields also accessible by name
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279 33
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280 >>> d = p._asdict() # convert to a dictionary
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281 >>> d['x']
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282 11
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283 >>> Point(**d) # convert from a dictionary
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284 Point(x=11, y=22)
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285 >>> p._replace(x=100) # _replace() is like str.replace() but targets named fields
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286 Point(x=100, y=22)
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287 """
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288
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289 # Validate the field names. At the user's option, either generate an error
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290 # message or automatically replace the field name with a valid name.
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291 if isinstance(field_names, basestring):
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292 field_names = field_names.replace(',', ' ').split()
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293 field_names = [str(x) for x in field_names]
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294 if rename:
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295 seen = set()
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296 for index, name in enumerate(field_names):
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297 if (not all(c.isalnum() or c == '_' for c in name)
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298 or _iskeyword(name)
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299 or not name
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300 or name[0].isdigit()
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301 or name.startswith('_')
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302 or name in seen):
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303 field_names[index] = '_%d' % index
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304 seen.add(name)
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305 for name in [typename] + field_names:
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306 if not all(c.isalnum() or c == '_' for c in name):
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307 raise ValueError('Type names and field names can only contain '
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308 'alphanumeric characters and underscores: %r'
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309 % name)
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310 if _iskeyword(name):
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311 raise ValueError('Type names and field names cannot be a '
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312 'keyword: %r' % name)
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313 if name[0].isdigit():
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314 raise ValueError('Type names and field names cannot start with '
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315 'a number: %r' % name)
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316 seen = set()
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317 for name in field_names:
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318 if name.startswith('_') and not rename:
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319 raise ValueError('Field names cannot start with an underscore: '
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320 '%r' % name)
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321 if name in seen:
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322 raise ValueError('Encountered duplicate field name: %r' % name)
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323 seen.add(name)
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324
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325 # Fill-in the class template
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326 fmt_kw = {'typename': typename}
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327 fmt_kw['field_names'] = tuple(field_names)
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328 fmt_kw['num_fields'] = len(field_names)
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329 fmt_kw['arg_list'] = repr(tuple(field_names)).replace("'", "")[1:-1]
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330 fmt_kw['repr_fmt'] = ', '.join(_repr_tmpl.format(name=name)
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331 for name in field_names)
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332 fmt_kw['field_defs'] = '\n'.join(_m_field_tmpl.format(index=index, name=name)
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333 for index, name in enumerate(field_names))
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334 class_definition = _namedlist_tmpl.format(**fmt_kw)
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335
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336 if verbose:
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337 print(class_definition)
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338
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339 def _itemsetter(key):
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340 def _itemsetter(obj, value):
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341 obj[key] = value
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342 return _itemsetter
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343
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344 # Execute the template string in a temporary namespace and support
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345 # tracing utilities by setting a value for frame.f_globals['__name__']
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346 namespace = dict(_itemgetter=_itemgetter,
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347 _itemsetter=_itemsetter,
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348 __name__='namedlist_%s' % typename,
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349 OrderedDict=OrderedDict,
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350 _property=property,
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351 _list=list)
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352 try:
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353 exec_(class_definition, namespace)
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354 except SyntaxError as e:
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355 raise SyntaxError(e.message + ':\n' + class_definition)
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356 result = namespace[typename]
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357
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358 # For pickling to work, the __module__ variable needs to be set to
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359 # the frame where the named list is created. Bypass this step in
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360 # environments where sys._getframe is not defined (Jython for
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361 # example) or sys._getframe is not defined for arguments greater
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362 # than 0 (IronPython).
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363 try:
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364 frame = _sys._getframe(1)
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365 result.__module__ = frame.f_globals.get('__name__', '__main__')
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366 except (AttributeError, ValueError):
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367 pass
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368
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369 return result