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@@ -1,252 +1,260 b'' | |||
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1 | 1 | # coding: utf-8 |
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2 | 2 | """Compatibility tricks for Python 3. Mainly to do with unicode.""" |
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3 | 3 | import functools |
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4 | 4 | import os |
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5 | 5 | import sys |
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6 | 6 | import re |
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7 | 7 | import types |
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8 | 8 | |
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9 | 9 | from .encoding import DEFAULT_ENCODING |
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10 | 10 | |
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11 | 11 | def no_code(x, encoding=None): |
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12 | 12 | return x |
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13 | 13 | |
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14 | 14 | def decode(s, encoding=None): |
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15 | 15 | encoding = encoding or DEFAULT_ENCODING |
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16 | 16 | return s.decode(encoding, "replace") |
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17 | 17 | |
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18 | 18 | def encode(u, encoding=None): |
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19 | 19 | encoding = encoding or DEFAULT_ENCODING |
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20 | 20 | return u.encode(encoding, "replace") |
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21 | 21 | |
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22 | 22 | |
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23 | 23 | def cast_unicode(s, encoding=None): |
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24 | 24 | if isinstance(s, bytes): |
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25 | 25 | return decode(s, encoding) |
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26 | 26 | return s |
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27 | 27 | |
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28 | 28 | def cast_bytes(s, encoding=None): |
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29 | 29 | if not isinstance(s, bytes): |
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30 | 30 | return encode(s, encoding) |
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31 | 31 | return s |
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32 | 32 | |
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33 | def buffer_to_bytes(buf): | |
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34 | """Cast a buffer object to bytes""" | |
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35 | if not isinstance(buf, bytes): | |
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36 | buf = bytes(buf) | |
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37 | return buf | |
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38 | ||
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33 | 39 | def _modify_str_or_docstring(str_change_func): |
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34 | 40 | @functools.wraps(str_change_func) |
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35 | 41 | def wrapper(func_or_str): |
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36 | 42 | if isinstance(func_or_str, string_types): |
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37 | 43 | func = None |
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38 | 44 | doc = func_or_str |
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39 | 45 | else: |
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40 | 46 | func = func_or_str |
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41 | 47 | doc = func.__doc__ |
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42 | 48 | |
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43 | 49 | doc = str_change_func(doc) |
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44 | 50 | |
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45 | 51 | if func: |
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46 | 52 | func.__doc__ = doc |
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47 | 53 | return func |
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48 | 54 | return doc |
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49 | 55 | return wrapper |
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50 | 56 | |
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51 | 57 | def safe_unicode(e): |
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52 | 58 | """unicode(e) with various fallbacks. Used for exceptions, which may not be |
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53 | 59 | safe to call unicode() on. |
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54 | 60 | """ |
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55 | 61 | try: |
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56 | 62 | return unicode_type(e) |
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57 | 63 | except UnicodeError: |
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58 | 64 | pass |
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59 | 65 | |
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60 | 66 | try: |
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61 | 67 | return str_to_unicode(str(e)) |
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62 | 68 | except UnicodeError: |
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63 | 69 | pass |
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64 | 70 | |
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65 | 71 | try: |
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66 | 72 | return str_to_unicode(repr(e)) |
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67 | 73 | except UnicodeError: |
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68 | 74 | pass |
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69 | 75 | |
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70 | 76 | return u'Unrecoverably corrupt evalue' |
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71 | 77 | |
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72 | 78 | if sys.version_info[0] >= 3: |
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73 | 79 | PY3 = True |
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74 | 80 | |
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75 | 81 | # keep reference to builtin_mod because the kernel overrides that value |
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76 | 82 | # to forward requests to a frontend. |
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77 | 83 | def input(prompt=''): |
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78 | 84 | return builtin_mod.input(prompt) |
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79 | 85 | |
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80 | 86 | builtin_mod_name = "builtins" |
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81 | 87 | import builtins as builtin_mod |
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82 | 88 | |
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83 | 89 | str_to_unicode = no_code |
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84 | 90 | unicode_to_str = no_code |
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85 | 91 | str_to_bytes = encode |
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86 | 92 | bytes_to_str = decode |
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87 | 93 | cast_bytes_py2 = no_code |
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88 | 94 | cast_unicode_py2 = no_code |
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95 | buffer_to_bytes_py2 = no_code | |
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89 | 96 | |
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90 | 97 | string_types = (str,) |
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91 | 98 | unicode_type = str |
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92 | 99 | |
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93 | 100 | def isidentifier(s, dotted=False): |
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94 | 101 | if dotted: |
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95 | 102 | return all(isidentifier(a) for a in s.split(".")) |
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96 | 103 | return s.isidentifier() |
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97 | 104 | |
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98 | 105 | xrange = range |
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99 | 106 | def iteritems(d): return iter(d.items()) |
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100 | 107 | def itervalues(d): return iter(d.values()) |
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101 | 108 | getcwd = os.getcwd |
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102 | 109 | |
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103 | 110 | MethodType = types.MethodType |
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104 | 111 | |
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105 | 112 | def execfile(fname, glob, loc=None, compiler=None): |
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106 | 113 | loc = loc if (loc is not None) else glob |
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107 | 114 | with open(fname, 'rb') as f: |
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108 | 115 | compiler = compiler or compile |
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109 | 116 | exec(compiler(f.read(), fname, 'exec'), glob, loc) |
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110 | 117 | |
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111 | 118 | # Refactor print statements in doctests. |
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112 | 119 | _print_statement_re = re.compile(r"\bprint (?P<expr>.*)$", re.MULTILINE) |
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113 | 120 | def _print_statement_sub(match): |
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114 | 121 | expr = match.groups('expr') |
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115 | 122 | return "print(%s)" % expr |
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116 | 123 | |
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117 | 124 | @_modify_str_or_docstring |
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118 | 125 | def doctest_refactor_print(doc): |
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119 | 126 | """Refactor 'print x' statements in a doctest to print(x) style. 2to3 |
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120 | 127 | unfortunately doesn't pick up on our doctests. |
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121 | 128 | |
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122 | 129 | Can accept a string or a function, so it can be used as a decorator.""" |
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123 | 130 | return _print_statement_re.sub(_print_statement_sub, doc) |
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124 | 131 | |
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125 | 132 | # Abstract u'abc' syntax: |
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126 | 133 | @_modify_str_or_docstring |
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127 | 134 | def u_format(s): |
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128 | 135 | """"{u}'abc'" --> "'abc'" (Python 3) |
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129 | 136 | |
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130 | 137 | Accepts a string or a function, so it can be used as a decorator.""" |
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131 | 138 | return s.format(u='') |
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132 | 139 | |
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133 | 140 | def get_closure(f): |
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134 | 141 | """Get a function's closure attribute""" |
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135 | 142 | return f.__closure__ |
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136 | 143 | |
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137 | 144 | else: |
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138 | 145 | PY3 = False |
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139 | 146 | |
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140 | 147 | # keep reference to builtin_mod because the kernel overrides that value |
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141 | 148 | # to forward requests to a frontend. |
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142 | 149 | def input(prompt=''): |
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143 | 150 | return builtin_mod.raw_input(prompt) |
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144 | 151 | |
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145 | 152 | builtin_mod_name = "__builtin__" |
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146 | 153 | import __builtin__ as builtin_mod |
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147 | 154 | |
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148 | 155 | str_to_unicode = decode |
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149 | 156 | unicode_to_str = encode |
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150 | 157 | str_to_bytes = no_code |
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151 | 158 | bytes_to_str = no_code |
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152 | 159 | cast_bytes_py2 = cast_bytes |
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153 | 160 | cast_unicode_py2 = cast_unicode |
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161 | buffer_to_bytes_py2 = buffer_to_bytes | |
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154 | 162 | |
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155 | 163 | string_types = (str, unicode) |
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156 | 164 | unicode_type = unicode |
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157 | 165 | |
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158 | 166 | import re |
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159 | 167 | _name_re = re.compile(r"[a-zA-Z_][a-zA-Z0-9_]*$") |
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160 | 168 | def isidentifier(s, dotted=False): |
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161 | 169 | if dotted: |
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162 | 170 | return all(isidentifier(a) for a in s.split(".")) |
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163 | 171 | return bool(_name_re.match(s)) |
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164 | 172 | |
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165 | 173 | xrange = xrange |
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166 | 174 | def iteritems(d): return d.iteritems() |
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167 | 175 | def itervalues(d): return d.itervalues() |
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168 | 176 | getcwd = os.getcwdu |
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169 | 177 | |
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170 | 178 | def MethodType(func, instance): |
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171 | 179 | return types.MethodType(func, instance, type(instance)) |
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172 | 180 | |
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173 | 181 | def doctest_refactor_print(func_or_str): |
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174 | 182 | return func_or_str |
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175 | 183 | |
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176 | 184 | def get_closure(f): |
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177 | 185 | """Get a function's closure attribute""" |
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178 | 186 | return f.func_closure |
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179 | 187 | |
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180 | 188 | # Abstract u'abc' syntax: |
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181 | 189 | @_modify_str_or_docstring |
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182 | 190 | def u_format(s): |
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183 | 191 | """"{u}'abc'" --> "u'abc'" (Python 2) |
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184 | 192 | |
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185 | 193 | Accepts a string or a function, so it can be used as a decorator.""" |
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186 | 194 | return s.format(u='u') |
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187 | 195 | |
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188 | 196 | if sys.platform == 'win32': |
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189 | 197 | def execfile(fname, glob=None, loc=None, compiler=None): |
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190 | 198 | loc = loc if (loc is not None) else glob |
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191 | 199 | scripttext = builtin_mod.open(fname).read()+ '\n' |
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192 | 200 | # compile converts unicode filename to str assuming |
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193 | 201 | # ascii. Let's do the conversion before calling compile |
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194 | 202 | if isinstance(fname, unicode): |
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195 | 203 | filename = unicode_to_str(fname) |
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196 | 204 | else: |
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197 | 205 | filename = fname |
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198 | 206 | compiler = compiler or compile |
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199 | 207 | exec(compiler(scripttext, filename, 'exec'), glob, loc) |
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200 | 208 | |
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201 | 209 | else: |
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202 | 210 | def execfile(fname, glob=None, loc=None, compiler=None): |
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203 | 211 | if isinstance(fname, unicode): |
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204 | 212 | filename = fname.encode(sys.getfilesystemencoding()) |
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205 | 213 | else: |
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206 | 214 | filename = fname |
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207 | 215 | where = [ns for ns in [glob, loc] if ns is not None] |
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208 | 216 | if compiler is None: |
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209 | 217 | builtin_mod.execfile(filename, *where) |
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210 | 218 | else: |
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211 | 219 | scripttext = builtin_mod.open(fname).read().rstrip() + '\n' |
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212 | 220 | exec(compiler(scripttext, filename, 'exec'), glob, loc) |
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213 | 221 | |
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214 | 222 | |
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215 | 223 | def annotate(**kwargs): |
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216 | 224 | """Python 3 compatible function annotation for Python 2.""" |
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217 | 225 | if not kwargs: |
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218 | 226 | raise ValueError('annotations must be provided as keyword arguments') |
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219 | 227 | def dec(f): |
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220 | 228 | if hasattr(f, '__annotations__'): |
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221 | 229 | for k, v in kwargs.items(): |
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222 | 230 | f.__annotations__[k] = v |
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223 | 231 | else: |
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224 | 232 | f.__annotations__ = kwargs |
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225 | 233 | return f |
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226 | 234 | return dec |
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227 | 235 | |
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228 | 236 | |
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229 | 237 | # Parts below taken from six: |
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230 | 238 | # Copyright (c) 2010-2013 Benjamin Peterson |
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231 | 239 | # |
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232 | 240 | # Permission is hereby granted, free of charge, to any person obtaining a copy |
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233 | 241 | # of this software and associated documentation files (the "Software"), to deal |
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234 | 242 | # in the Software without restriction, including without limitation the rights |
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235 | 243 | # to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
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236 | 244 | # copies of the Software, and to permit persons to whom the Software is |
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237 | 245 | # furnished to do so, subject to the following conditions: |
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238 | 246 | # |
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239 | 247 | # The above copyright notice and this permission notice shall be included in all |
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240 | 248 | # copies or substantial portions of the Software. |
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241 | 249 | # |
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242 | 250 | # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
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243 | 251 | # IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
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244 | 252 | # FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
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245 | 253 | # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
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246 | 254 | # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
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247 | 255 | # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE |
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248 | 256 | # SOFTWARE. |
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249 | 257 | |
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250 | 258 | def with_metaclass(meta, *bases): |
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251 | 259 | """Create a base class with a metaclass.""" |
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252 | 260 | return meta("_NewBase", bases, {}) |
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