Mercurial > cpython-lru_cache-weakref

annotate Lib/codeop.py @ 49955:878d40468c4e legacy-trunk

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Issue #4384: Added logging integration with warnings module using captureWarnings(). This change includes a NullHandler which does nothing; it will be of use to library developers who want to avoid the "No handlers could be found for logger XXX" message which can appear if the library user doesn't configure logging.
author Vinay Sajip <vinay_sajip@yahoo.co.uk>
date Wed, 03 Dec 2008 23:22:58 +0000
parents 4c0823f0a0a1
children 6b18a095c2e7
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 r"""Utilities to compile possibly incomplete Python source code.
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2
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3 This module provides two interfaces, broadly similar to the builtin
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4 function compile(), which take program text, a filename and a 'mode'
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5 and:
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6
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7 - Return code object if the command is complete and valid
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8 - Return None if the command is incomplete
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9 - Raise SyntaxError, ValueError or OverflowError if the command is a
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10 syntax error (OverflowError and ValueError can be produced by
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11 malformed literals).
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12
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13 Approach:
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14
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15 First, check if the source consists entirely of blank lines and
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16 comments; if so, replace it with 'pass', because the built-in
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17 parser doesn't always do the right thing for these.
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18
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19 Compile three times: as is, with \n, and with \n\n appended. If it
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20 compiles as is, it's complete. If it compiles with one \n appended,
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21 we expect more. If it doesn't compile either way, we compare the
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22 error we get when compiling with \n or \n\n appended. If the errors
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23 are the same, the code is broken. But if the errors are different, we
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24 expect more. Not intuitive; not even guaranteed to hold in future
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25 releases; but this matches the compiler's behavior from Python 1.4
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26 through 2.2, at least.
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27
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28 Caveat:
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29
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30 It is possible (but not likely) that the parser stops parsing with a
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31 successful outcome before reaching the end of the source; in this
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32 case, trailing symbols may be ignored instead of causing an error.
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33 For example, a backslash followed by two newlines may be followed by
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34 arbitrary garbage. This will be fixed once the API for the parser is
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35 better.
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36
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37 The two interfaces are:
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38
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39 compile_command(source, filename, symbol):
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40
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41 Compiles a single command in the manner described above.
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42
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43 CommandCompiler():
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44
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45 Instances of this class have __call__ methods identical in
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46 signature to compile_command; the difference is that if the
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47 instance compiles program text containing a __future__ statement,
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48 the instance 'remembers' and compiles all subsequent program texts
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49 with the statement in force.
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50
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51 The module also provides another class:
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52
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53 Compile():
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54
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55 Instances of this class act like the built-in function compile,
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56 but with 'memory' in the sense described above.
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57 """
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58
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59 import __future__
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60
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61 _features = [getattr(__future__, fname)
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62 for fname in __future__.all_feature_names]
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64 __all__ = ["compile_command", "Compile", "CommandCompiler"]
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65
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66 PyCF_DONT_IMPLY_DEDENT = 0x200 # Matches pythonrun.h
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67
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68 def _maybe_compile(compiler, source, filename, symbol):
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69 # Check for source consisting of only blank lines and comments
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70 for line in source.split("\n"):
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71 line = line.strip()
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72 if line and line[0] != '#':
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73 break # Leave it alone
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74 else:
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75 if symbol != "eval":
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76 source = "pass" # Replace it with a 'pass' statement
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77
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78 err = err1 = err2 = None
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79 code = code1 = code2 = None
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80
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81 try:
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82 code = compiler(source, filename, symbol)
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83 except SyntaxError, err:
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84 pass
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85
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86 try:
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87 code1 = compiler(source + "\n", filename, symbol)
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88 except SyntaxError, err1:
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89 pass
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91 try:
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92 code2 = compiler(source + "\n\n", filename, symbol)
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93 except SyntaxError, err2:
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94 pass
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96 if code:
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97 return code
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98 if not code1 and repr(err1) == repr(err2):
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99 raise SyntaxError, err1
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100
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101 def _compile(source, filename, symbol):
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102 return compile(source, filename, symbol, PyCF_DONT_IMPLY_DEDENT)
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103
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104 def compile_command(source, filename="<input>", symbol="single"):
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105 r"""Compile a command and determine whether it is incomplete.
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106
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107 Arguments:
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108
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109 source -- the source string; may contain \n characters
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110 filename -- optional filename from which source was read; default
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111 "<input>"
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112 symbol -- optional grammar start symbol; "single" (default) or "eval"
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113
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114 Return value / exceptions raised:
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115
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116 - Return a code object if the command is complete and valid
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117 - Return None if the command is incomplete
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118 - Raise SyntaxError, ValueError or OverflowError if the command is a
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119 syntax error (OverflowError and ValueError can be produced by
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120 malformed literals).
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121 """
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122 return _maybe_compile(_compile, source, filename, symbol)
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123
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124 class Compile:
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125 """Instances of this class behave much like the built-in compile
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126 function, but if one is used to compile text containing a future
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127 statement, it "remembers" and compiles all subsequent program texts
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128 with the statement in force."""
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129 def __init__(self):
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130 self.flags = PyCF_DONT_IMPLY_DEDENT
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131
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132 def __call__(self, source, filename, symbol):
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133 codeob = compile(source, filename, symbol, self.flags, 1)
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134 for feature in _features:
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135 if codeob.co_flags & feature.compiler_flag:
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136 self.flags |= feature.compiler_flag
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137 return codeob
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138
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139 class CommandCompiler:
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140 """Instances of this class have __call__ methods identical in
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141 signature to compile_command; the difference is that if the
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142 instance compiles program text containing a __future__ statement,
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143 the instance 'remembers' and compiles all subsequent program texts
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144 with the statement in force."""
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145
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146 def __init__(self,):
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147 self.compiler = Compile()
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148
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149 def __call__(self, source, filename="<input>", symbol="single"):
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150 r"""Compile a command and determine whether it is incomplete.
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151
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152 Arguments:
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153
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154 source -- the source string; may contain \n characters
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155 filename -- optional filename from which source was read;
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156 default "<input>"
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157 symbol -- optional grammar start symbol; "single" (default) or
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158 "eval"
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159
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160 Return value / exceptions raised:
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161
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162 - Return a code object if the command is complete and valid
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163 - Return None if the command is incomplete
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164 - Raise SyntaxError, ValueError or OverflowError if the command is a
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165 syntax error (OverflowError and ValueError can be produced by
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166 malformed literals).
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167 """
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168 return _maybe_compile(self.compiler, source, filename, symbol)