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Diffstat (limited to 'lib/python2.7/codeop.py')
| -rw-r--r-- | lib/python2.7/codeop.py | 168 |
1 files changed, 0 insertions, 168 deletions
diff --git a/lib/python2.7/codeop.py b/lib/python2.7/codeop.py deleted file mode 100644 index 5616d92..0000000 --- a/lib/python2.7/codeop.py +++ /dev/null @@ -1,168 +0,0 @@ -r"""Utilities to compile possibly incomplete Python source code. - -This module provides two interfaces, broadly similar to the builtin -function compile(), which take program text, a filename and a 'mode' -and: - -- Return code object if the command is complete and valid -- Return None if the command is incomplete -- Raise SyntaxError, ValueError or OverflowError if the command is a - syntax error (OverflowError and ValueError can be produced by - malformed literals). - -Approach: - -First, check if the source consists entirely of blank lines and -comments; if so, replace it with 'pass', because the built-in -parser doesn't always do the right thing for these. - -Compile three times: as is, with \n, and with \n\n appended. If it -compiles as is, it's complete. If it compiles with one \n appended, -we expect more. If it doesn't compile either way, we compare the -error we get when compiling with \n or \n\n appended. If the errors -are the same, the code is broken. But if the errors are different, we -expect more. Not intuitive; not even guaranteed to hold in future -releases; but this matches the compiler's behavior from Python 1.4 -through 2.2, at least. - -Caveat: - -It is possible (but not likely) that the parser stops parsing with a -successful outcome before reaching the end of the source; in this -case, trailing symbols may be ignored instead of causing an error. -For example, a backslash followed by two newlines may be followed by -arbitrary garbage. This will be fixed once the API for the parser is -better. - -The two interfaces are: - -compile_command(source, filename, symbol): - - Compiles a single command in the manner described above. - -CommandCompiler(): - - Instances of this class have __call__ methods identical in - signature to compile_command; the difference is that if the - instance compiles program text containing a __future__ statement, - the instance 'remembers' and compiles all subsequent program texts - with the statement in force. - -The module also provides another class: - -Compile(): - - Instances of this class act like the built-in function compile, - but with 'memory' in the sense described above. -""" - -import __future__ - -_features = [getattr(__future__, fname) - for fname in __future__.all_feature_names] - -__all__ = ["compile_command", "Compile", "CommandCompiler"] - -PyCF_DONT_IMPLY_DEDENT = 0x200 # Matches pythonrun.h - -def _maybe_compile(compiler, source, filename, symbol): - # Check for source consisting of only blank lines and comments - for line in source.split("\n"): - line = line.strip() - if line and line[0] != '#': - break # Leave it alone - else: - if symbol != "eval": - source = "pass" # Replace it with a 'pass' statement - - err = err1 = err2 = None - code = code1 = code2 = None - - try: - code = compiler(source, filename, symbol) - except SyntaxError, err: - pass - - try: - code1 = compiler(source + "\n", filename, symbol) - except SyntaxError, err1: - pass - - try: - code2 = compiler(source + "\n\n", filename, symbol) - except SyntaxError, err2: - pass - - if code: - return code - if not code1 and repr(err1) == repr(err2): - raise SyntaxError, err1 - -def _compile(source, filename, symbol): - return compile(source, filename, symbol, PyCF_DONT_IMPLY_DEDENT) - -def compile_command(source, filename="<input>", symbol="single"): - r"""Compile a command and determine whether it is incomplete. - - Arguments: - - source -- the source string; may contain \n characters - filename -- optional filename from which source was read; default - "<input>" - symbol -- optional grammar start symbol; "single" (default) or "eval" - - Return value / exceptions raised: - - - Return a code object if the command is complete and valid - - Return None if the command is incomplete - - Raise SyntaxError, ValueError or OverflowError if the command is a - syntax error (OverflowError and ValueError can be produced by - malformed literals). - """ - return _maybe_compile(_compile, source, filename, symbol) - -class Compile: - """Instances of this class behave much like the built-in compile - function, but if one is used to compile text containing a future - statement, it "remembers" and compiles all subsequent program texts - with the statement in force.""" - def __init__(self): - self.flags = PyCF_DONT_IMPLY_DEDENT - - def __call__(self, source, filename, symbol): - codeob = compile(source, filename, symbol, self.flags, 1) - for feature in _features: - if codeob.co_flags & feature.compiler_flag: - self.flags |= feature.compiler_flag - return codeob - -class CommandCompiler: - """Instances of this class have __call__ methods identical in - signature to compile_command; the difference is that if the - instance compiles program text containing a __future__ statement, - the instance 'remembers' and compiles all subsequent program texts - with the statement in force.""" - - def __init__(self,): - self.compiler = Compile() - - def __call__(self, source, filename="<input>", symbol="single"): - r"""Compile a command and determine whether it is incomplete. - - Arguments: - - source -- the source string; may contain \n characters - filename -- optional filename from which source was read; - default "<input>" - symbol -- optional grammar start symbol; "single" (default) or - "eval" - - Return value / exceptions raised: - - - Return a code object if the command is complete and valid - - Return None if the command is incomplete - - Raise SyntaxError, ValueError or OverflowError if the command is a - syntax error (OverflowError and ValueError can be produced by - malformed literals). - """ - return _maybe_compile(self.compiler, source, filename, symbol) |