mirror of
https://github.com/thegeeklab/ansible-later.git
synced 2024-06-26 20:21:01 +02:00
329 lines
10 KiB
Python
329 lines
10 KiB
Python
from __future__ import absolute_import
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from __future__ import division
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from __future__ import print_function
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import ast
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import inspect
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import linecache
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import sys
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import textwrap
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import tokenize
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import warnings
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from ast import PyCF_ONLY_AST as _AST_FLAG
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from bisect import bisect_right
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import py
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import six
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class Source(object):
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""" an immutable object holding a source code fragment,
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possibly deindenting it.
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"""
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_compilecounter = 0
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def __init__(self, *parts, **kwargs):
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self.lines = lines = []
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de = kwargs.get("deindent", True)
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for part in parts:
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if not part:
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partlines = []
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elif isinstance(part, Source):
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partlines = part.lines
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elif isinstance(part, (tuple, list)):
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partlines = [x.rstrip("\n") for x in part]
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elif isinstance(part, six.string_types):
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partlines = part.split("\n")
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else:
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partlines = getsource(part, deindent=de).lines
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if de:
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partlines = deindent(partlines)
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lines.extend(partlines)
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def __eq__(self, other):
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try:
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return self.lines == other.lines
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except AttributeError:
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if isinstance(other, str):
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return str(self) == other
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return False
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__hash__ = None
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def __getitem__(self, key):
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if isinstance(key, int):
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return self.lines[key]
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else:
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if key.step not in (None, 1):
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raise IndexError("cannot slice a Source with a step")
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newsource = Source()
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newsource.lines = self.lines[key.start : key.stop]
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return newsource
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def __len__(self):
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return len(self.lines)
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def strip(self):
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""" return new source object with trailing
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and leading blank lines removed.
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"""
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start, end = 0, len(self)
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while start < end and not self.lines[start].strip():
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start += 1
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while end > start and not self.lines[end - 1].strip():
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end -= 1
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source = Source()
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source.lines[:] = self.lines[start:end]
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return source
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def putaround(self, before="", after="", indent=" " * 4):
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""" return a copy of the source object with
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'before' and 'after' wrapped around it.
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"""
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before = Source(before)
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after = Source(after)
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newsource = Source()
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lines = [(indent + line) for line in self.lines]
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newsource.lines = before.lines + lines + after.lines
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return newsource
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def indent(self, indent=" " * 4):
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""" return a copy of the source object with
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all lines indented by the given indent-string.
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"""
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newsource = Source()
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newsource.lines = [(indent + line) for line in self.lines]
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return newsource
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def getstatement(self, lineno):
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""" return Source statement which contains the
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given linenumber (counted from 0).
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"""
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start, end = self.getstatementrange(lineno)
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return self[start:end]
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def getstatementrange(self, lineno):
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""" return (start, end) tuple which spans the minimal
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statement region which containing the given lineno.
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"""
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if not (0 <= lineno < len(self)):
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raise IndexError("lineno out of range")
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ast, start, end = getstatementrange_ast(lineno, self)
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return start, end
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def deindent(self):
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"""return a new source object deindented."""
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newsource = Source()
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newsource.lines[:] = deindent(self.lines)
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return newsource
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def isparseable(self, deindent=True):
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""" return True if source is parseable, heuristically
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deindenting it by default.
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"""
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from parser import suite as syntax_checker
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if deindent:
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source = str(self.deindent())
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else:
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source = str(self)
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try:
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# compile(source+'\n', "x", "exec")
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syntax_checker(source + "\n")
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except KeyboardInterrupt:
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raise
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except Exception:
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return False
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else:
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return True
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def __str__(self):
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return "\n".join(self.lines)
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def compile(
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self, filename=None, mode="exec", flag=0, dont_inherit=0, _genframe=None
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):
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""" return compiled code object. if filename is None
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invent an artificial filename which displays
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the source/line position of the caller frame.
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"""
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if not filename or py.path.local(filename).check(file=0):
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if _genframe is None:
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_genframe = sys._getframe(1) # the caller
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fn, lineno = _genframe.f_code.co_filename, _genframe.f_lineno
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base = "<%d-codegen " % self._compilecounter
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self.__class__._compilecounter += 1
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if not filename:
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filename = base + "%s:%d>" % (fn, lineno)
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else:
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filename = base + "%r %s:%d>" % (filename, fn, lineno)
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source = "\n".join(self.lines) + "\n"
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try:
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co = compile(source, filename, mode, flag)
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except SyntaxError:
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ex = sys.exc_info()[1]
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# re-represent syntax errors from parsing python strings
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msglines = self.lines[: ex.lineno]
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if ex.offset:
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msglines.append(" " * ex.offset + "^")
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msglines.append("(code was compiled probably from here: %s)" % filename)
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newex = SyntaxError("\n".join(msglines))
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newex.offset = ex.offset
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newex.lineno = ex.lineno
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newex.text = ex.text
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raise newex
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else:
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if flag & _AST_FLAG:
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return co
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lines = [(x + "\n") for x in self.lines]
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linecache.cache[filename] = (1, None, lines, filename)
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return co
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#
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# public API shortcut functions
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#
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def compile_(source, filename=None, mode="exec", flags=0, dont_inherit=0):
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""" compile the given source to a raw code object,
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and maintain an internal cache which allows later
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retrieval of the source code for the code object
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and any recursively created code objects.
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"""
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if isinstance(source, ast.AST):
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# XXX should Source support having AST?
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return compile(source, filename, mode, flags, dont_inherit)
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_genframe = sys._getframe(1) # the caller
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s = Source(source)
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co = s.compile(filename, mode, flags, _genframe=_genframe)
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return co
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def getfslineno(obj):
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""" Return source location (path, lineno) for the given object.
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If the source cannot be determined return ("", -1).
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The line number is 0-based.
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"""
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from .code import Code
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try:
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code = Code(obj)
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except TypeError:
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try:
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fn = inspect.getsourcefile(obj) or inspect.getfile(obj)
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except TypeError:
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return "", -1
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fspath = fn and py.path.local(fn) or None
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lineno = -1
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if fspath:
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try:
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_, lineno = findsource(obj)
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except IOError:
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pass
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else:
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fspath = code.path
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lineno = code.firstlineno
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assert isinstance(lineno, int)
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return fspath, lineno
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#
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# helper functions
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#
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def findsource(obj):
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try:
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sourcelines, lineno = inspect.findsource(obj)
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except Exception:
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return None, -1
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source = Source()
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source.lines = [line.rstrip() for line in sourcelines]
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return source, lineno
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def getsource(obj, **kwargs):
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from .code import getrawcode
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obj = getrawcode(obj)
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try:
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strsrc = inspect.getsource(obj)
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except IndentationError:
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strsrc = '"Buggy python version consider upgrading, cannot get source"'
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assert isinstance(strsrc, str)
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return Source(strsrc, **kwargs)
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def deindent(lines):
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return textwrap.dedent("\n".join(lines)).splitlines()
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def get_statement_startend2(lineno, node):
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import ast
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# flatten all statements and except handlers into one lineno-list
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# AST's line numbers start indexing at 1
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values = []
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for x in ast.walk(node):
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if isinstance(x, (ast.stmt, ast.ExceptHandler)):
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values.append(x.lineno - 1)
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for name in ("finalbody", "orelse"):
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val = getattr(x, name, None)
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if val:
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# treat the finally/orelse part as its own statement
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values.append(val[0].lineno - 1 - 1)
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values.sort()
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insert_index = bisect_right(values, lineno)
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start = values[insert_index - 1]
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if insert_index >= len(values):
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end = None
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else:
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end = values[insert_index]
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return start, end
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def getstatementrange_ast(lineno, source, assertion=False, astnode=None):
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if astnode is None:
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content = str(source)
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# See #4260:
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# don't produce duplicate warnings when compiling source to find ast
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with warnings.catch_warnings():
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warnings.simplefilter("ignore")
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astnode = compile(content, "source", "exec", _AST_FLAG)
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start, end = get_statement_startend2(lineno, astnode)
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# we need to correct the end:
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# - ast-parsing strips comments
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# - there might be empty lines
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# - we might have lesser indented code blocks at the end
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if end is None:
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end = len(source.lines)
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if end > start + 1:
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# make sure we don't span differently indented code blocks
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# by using the BlockFinder helper used which inspect.getsource() uses itself
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block_finder = inspect.BlockFinder()
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# if we start with an indented line, put blockfinder to "started" mode
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block_finder.started = source.lines[start][0].isspace()
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it = ((x + "\n") for x in source.lines[start:end])
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try:
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for tok in tokenize.generate_tokens(lambda: next(it)):
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block_finder.tokeneater(*tok)
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except (inspect.EndOfBlock, IndentationError):
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end = block_finder.last + start
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except Exception:
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pass
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# the end might still point to a comment or empty line, correct it
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while end:
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line = source.lines[end - 1].lstrip()
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if line.startswith("#") or not line:
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end -= 1
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else:
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break
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return astnode, start, end
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