411 lines
14 KiB
Python
411 lines
14 KiB
Python
from __future__ import generators
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from bisect import bisect_right
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import sys
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import inspect, tokenize
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import py
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from types import ModuleType
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cpy_compile = compile
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try:
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import _ast
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from _ast import PyCF_ONLY_AST as _AST_FLAG
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except ImportError:
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_AST_FLAG = 0
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_ast = None
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class Source(object):
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""" a 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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rstrip = kwargs.get('rstrip', 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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if 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, py.builtin._basestring):
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partlines = part.split('\n')
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if rstrip:
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while partlines:
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if partlines[-1].strip():
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break
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partlines.pop()
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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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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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return self.__getslice__(key.start, key.stop)
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def __len__(self):
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return len(self.lines)
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def __getslice__(self, start, end):
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newsource = Source()
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newsource.lines = self.lines[start:end]
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return newsource
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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, assertion=False):
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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, assertion)
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return self[start:end]
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def getstatementrange(self, lineno, assertion=False):
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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, offset=None):
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""" return a new source object deindented by offset.
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If offset is None then guess an indentation offset from
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the first non-blank line. Subsequent lines which have a
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lower indentation offset will be copied verbatim as
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they are assumed to be part of multilines.
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"""
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# XXX maybe use the tokenizer to properly handle multiline
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# strings etc.pp?
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newsource = Source()
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newsource.lines[:] = deindent(self.lines, offset)
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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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try:
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import parser
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except ImportError:
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syntax_checker = lambda x: compile(x, 'asd', 'exec')
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else:
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syntax_checker = parser.suite
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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(self, filename=None, mode='exec',
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flag=generators.compiler_flag,
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dont_inherit=0, _genframe=None):
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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 = cpy_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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import linecache
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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=
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generators.compiler_flag, 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 _ast is not None and isinstance(source, _ast.AST):
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# XXX should Source support having AST?
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return cpy_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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"""
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try:
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code = py.code.Code(obj)
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except TypeError:
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try:
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fn = (inspect.getsourcefile(obj) or
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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 py.builtin._sysex:
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raise
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except:
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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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obj = py.code.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, offset=None):
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if offset is None:
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for line in lines:
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line = line.expandtabs()
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s = line.lstrip()
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if s:
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offset = len(line)-len(s)
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break
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else:
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offset = 0
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if offset == 0:
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return list(lines)
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newlines = []
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def readline_generator(lines):
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for line in lines:
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yield line + '\n'
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while True:
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yield ''
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it = readline_generator(lines)
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try:
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for _, _, (sline, _), (eline, _), _ in tokenize.generate_tokens(lambda: next(it)):
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if sline > len(lines):
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break # End of input reached
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if sline > len(newlines):
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line = lines[sline - 1].expandtabs()
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if line.lstrip() and line[:offset].isspace():
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line = line[offset:] # Deindent
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newlines.append(line)
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for i in range(sline, eline):
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# Don't deindent continuing lines of
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# multiline tokens (i.e. multiline strings)
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newlines.append(lines[i])
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except (IndentationError, tokenize.TokenError):
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pass
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# Add any lines we didn't see. E.g. if an exception was raised.
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newlines.extend(lines[len(newlines):])
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return newlines
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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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l = []
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for x in ast.walk(node):
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if isinstance(x, _ast.stmt) or isinstance(x, _ast.ExceptHandler):
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l.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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l.append(val[0].lineno - 1 - 1)
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l.sort()
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insert_index = bisect_right(l, lineno)
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start = l[insert_index - 1]
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if insert_index >= len(l):
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end = None
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else:
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end = l[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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try:
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astnode = compile(content, "source", "exec", 1024) # 1024 for AST
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except ValueError:
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start, end = getstatementrange_old(lineno, source, assertion)
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return None, start, end
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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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def getstatementrange_old(lineno, source, assertion=False):
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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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raise an IndexError if no such statementrange can be found.
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"""
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# XXX this logic is only used on python2.4 and below
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# 1. find the start of the statement
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from codeop import compile_command
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for start in range(lineno, -1, -1):
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if assertion:
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line = source.lines[start]
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# the following lines are not fully tested, change with care
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if 'super' in line and 'self' in line and '__init__' in line:
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raise IndexError("likely a subclass")
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if "assert" not in line and "raise" not in line:
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continue
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trylines = source.lines[start:lineno+1]
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# quick hack to prepare parsing an indented line with
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# compile_command() (which errors on "return" outside defs)
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trylines.insert(0, 'def xxx():')
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trysource = '\n '.join(trylines)
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# ^ space here
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try:
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compile_command(trysource)
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except (SyntaxError, OverflowError, ValueError):
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continue
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# 2. find the end of the statement
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for end in range(lineno+1, len(source)+1):
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trysource = source[start:end]
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if trysource.isparseable():
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return start, end
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raise SyntaxError("no valid source range around line %d " % (lineno,))
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