112 lines
3.2 KiB
Python
112 lines
3.2 KiB
Python
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# -*- coding: utf-8 -*-
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"""
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Part of the astor library for Python AST manipulation.
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License: 3-clause BSD
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Copyright (c) 2012-2015 Patrick Maupin
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Copyright (c) 2013-2015 Berker Peksag
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Functions that interact with the filesystem go here.
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"""
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import ast
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import sys
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import os
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try:
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from tokenize import open as fopen
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except ImportError:
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fopen = open
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class CodeToAst(object):
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"""Given a module, or a function that was compiled as part
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of a module, re-compile the module into an AST and extract
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the sub-AST for the function. Allow caching to reduce
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number of compiles.
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Also contains static helper utility functions to
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look for python files, to parse python files, and to extract
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the file/line information from a code object.
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"""
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@staticmethod
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def find_py_files(srctree, ignore=None):
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"""Return all the python files in a source tree
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Ignores any path that contains the ignore string
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This is not used by other class methods, but is
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designed to be used in code that uses this class.
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"""
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if not os.path.isdir(srctree):
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yield os.path.split(srctree)
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for srcpath, _, fnames in os.walk(srctree):
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# Avoid infinite recursion for silly users
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if ignore is not None and ignore in srcpath:
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continue
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for fname in (x for x in fnames if x.endswith('.py')):
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yield srcpath, fname
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@staticmethod
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def parse_file(fname):
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"""Parse a python file into an AST.
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This is a very thin wrapper around ast.parse
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TODO: Handle encodings other than the default for Python 2
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(issue #26)
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"""
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try:
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with fopen(fname) as f:
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fstr = f.read()
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except IOError:
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if fname != 'stdin':
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raise
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sys.stdout.write('\nReading from stdin:\n\n')
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fstr = sys.stdin.read()
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fstr = fstr.replace('\r\n', '\n').replace('\r', '\n')
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if not fstr.endswith('\n'):
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fstr += '\n'
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return ast.parse(fstr, filename=fname)
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@staticmethod
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def get_file_info(codeobj):
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"""Returns the file and line number of a code object.
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If the code object has a __file__ attribute (e.g. if
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it is a module), then the returned line number will
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be 0
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"""
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fname = getattr(codeobj, '__file__', None)
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linenum = 0
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if fname is None:
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func_code = codeobj.__code__
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fname = func_code.co_filename
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linenum = func_code.co_firstlineno
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fname = fname.replace('.pyc', '.py')
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return fname, linenum
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def __init__(self, cache=None):
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self.cache = cache or {}
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def __call__(self, codeobj):
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cache = self.cache
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key = self.get_file_info(codeobj)
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result = cache.get(key)
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if result is not None:
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return result
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fname = key[0]
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cache[(fname, 0)] = mod_ast = self.parse_file(fname)
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for obj in mod_ast.body:
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if not isinstance(obj, ast.FunctionDef):
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continue
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cache[(fname, obj.lineno)] = obj
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return cache[key]
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code_to_ast = CodeToAst()
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