313 lines
10 KiB
Python
313 lines
10 KiB
Python
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from __future__ import with_statement
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from _compatibility import exec_function
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import re
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import tokenize
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import sys
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import os
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import time
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import parsing
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import builtin
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import debug
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import evaluate
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import settings
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import imports
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class Module(builtin.CachedModule):
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"""
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Manages all files, that are parsed and caches them.
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:param path: The module path of the file.
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:param source: The source code of the file.
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"""
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def __init__(self, path, source):
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super(Module, self).__init__(path=path)
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self.source = source
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self._line_cache = None
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def _get_source(self):
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""" Just one time """
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s = self.source
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del self.source # memory efficiency
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return s
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class ModuleWithCursor(Module):
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"""
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Manages all files, that are parsed and caches them.
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Important are the params source and path, one of them has to
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be there.
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:param source: The source code of the file.
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:param path: The module path of the file or None.
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:param position: The position, the user is currently in. Only important \
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for the main file.
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"""
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def __init__(self, path, source, position):
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super(ModuleWithCursor, self).__init__(path, source)
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self.position = position
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# this two are only used, because there is no nonlocal in Python 2
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self._line_temp = None
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self._relevant_temp = None
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self.source = source
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self._part_parser = None
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@property
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def parser(self):
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""" get the parser lazy """
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if not self._parser:
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try:
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ts, parser = builtin.CachedModule.cache[self.path]
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imports.invalidate_star_import_cache(parser.module)
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del builtin.CachedModule.cache[self.path]
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except KeyError:
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pass
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# Call the parser already here, because it will be used anyways.
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# Also, the position is here important (which will not be used by
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# default), therefore fill the cache here.
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self._parser = parsing.PyFuzzyParser(self.source, self.path,
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self.position)
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if self.path is not None:
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builtin.CachedModule.cache[self.path] = time.time(), \
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self._parser
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return self._parser
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def get_path_until_cursor(self):
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""" Get the path under the cursor. """
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result = self._get_path_until_cursor()
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self._start_cursor_pos = self._line_temp + 1, self._column_temp
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return result
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def _get_path_until_cursor(self, start_pos=None):
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def fetch_line():
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line = self.get_line(self._line_temp)
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if self._is_first:
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self._is_first = False
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self._line_length = self._column_temp
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line = line[:self._column_temp]
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else:
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self._line_length = len(line)
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line = line + '\n'
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# add lines with a backslash at the end
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while 1:
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self._line_temp -= 1
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last_line = self.get_line(self._line_temp)
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if last_line and last_line[-1] == '\\':
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line = last_line[:-1] + ' ' + line
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else:
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break
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return line[::-1]
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self._is_first = True
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if start_pos is None:
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self._line_temp = self.position[0]
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self._column_temp = self.position[1]
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else:
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self._line_temp, self._column_temp = start_pos
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open_brackets = ['(', '[', '{']
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close_brackets = [')', ']', '}']
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gen = tokenize.generate_tokens(fetch_line)
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string = ''
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level = 0
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force_point = False
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try:
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for token_type, tok, start, end, line in gen:
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#print 'tok', token_type, tok, force_point
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if level > 0:
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if tok in close_brackets:
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level += 1
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if tok in open_brackets:
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level -= 1
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elif tok == '.':
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force_point = False
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elif force_point:
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# it is reversed, therefore a number is getting recognized
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# as a floating point number
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if token_type == tokenize.NUMBER and tok[0] == '.':
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force_point = False
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else:
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break
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elif tok in close_brackets:
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level += 1
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elif token_type in [tokenize.NAME, tokenize.STRING]:
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force_point = True
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elif token_type == tokenize.NUMBER:
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pass
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else:
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break
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self._column_temp = self._line_length - end[1]
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string += tok
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except tokenize.TokenError:
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debug.warning("Tokenize couldn't finish", sys.exc_info)
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return string[::-1]
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def get_path_under_cursor(self):
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"""
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Return the path under the cursor. If there is a rest of the path left,
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it will be added to the stuff before it.
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"""
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line = self.get_line(self.position[0])
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after = re.search("[\w\d]*", line[self.position[1]:]).group(0)
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return self.get_path_until_cursor() + after
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def get_operator_under_cursor(self):
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line = self.get_line(self.position[0])
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after = re.match("[^\w\s]+", line[self.position[1]:])
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before = re.match("[^\w\s]+", line[:self.position[1]][::-1])
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return (before.group(0) if before is not None else '') \
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+ (after.group(0) if after is not None else '')
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def get_context(self):
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pos = self._start_cursor_pos
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while pos > (1, 0):
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# remove non important white space
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line = self.get_line(pos[0])
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while pos[1] > 0 and line[pos[1] - 1].isspace():
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pos = pos[0], pos[1] - 1
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try:
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yield self._get_path_until_cursor(start_pos=pos)
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except StopIteration:
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yield ''
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pos = self._line_temp, self._column_temp
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while True:
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yield ''
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def get_line(self, line_nr):
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if not self._line_cache:
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self._line_cache = self.source.split('\n')
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if line_nr == 0:
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# This is a fix for the zeroth line. We need a newline there, for
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# the backwards parser.
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return ''
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if line_nr < 0:
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raise StopIteration()
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try:
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return self._line_cache[line_nr - 1]
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except IndexError:
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raise StopIteration()
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def get_part_parser(self):
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""" Returns a parser that contains only part of the source code. This
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exists only because of performance reasons.
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"""
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if self._part_parser:
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return self._part_parser
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# TODO check for docstrings
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length = settings.part_line_length
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offset = max(self.position[0] - length, 0)
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s = '\n'.join(self.source.split('\n')[offset:offset + length])
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self._part_parser = parsing.PyFuzzyParser(s, self.path, self.position,
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line_offset=offset)
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return self._part_parser
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@evaluate.memoize_default([])
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def sys_path_with_modifications(module):
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def execute_code(code):
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c = "import os; from os.path import *; result=%s"
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variables = {'__file__': module.path}
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try:
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exec_function(c % code, variables)
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except Exception:
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debug.warning('sys path detected, but failed to evaluate')
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return None
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try:
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res = variables['result']
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if isinstance(res, str):
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return os.path.abspath(res)
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else:
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return None
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except KeyError:
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return None
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def check_module(module):
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try:
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possible_stmts = module.used_names['path']
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except KeyError:
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return builtin.get_sys_path()
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sys_path = list(builtin.get_sys_path()) # copy
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for p in possible_stmts:
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try:
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call = p.get_assignment_calls().get_only_subelement()
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except AttributeError:
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continue
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n = call.name
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if not isinstance(n, parsing.Name) or len(n.names) != 3:
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continue
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if n.names[:2] != ('sys', 'path'):
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continue
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array_cmd = n.names[2]
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if call.execution is None:
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continue
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exe = call.execution
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if not (array_cmd == 'insert' and len(exe) == 2
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or array_cmd == 'append' and len(exe) == 1):
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continue
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if array_cmd == 'insert':
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exe_type, exe.type = exe.type, parsing.Array.NOARRAY
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exe_pop = exe.values.pop(0)
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res = execute_code(exe.get_code())
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if res is not None:
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sys_path.insert(0, res)
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debug.dbg('sys path inserted: %s' % res)
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exe.type = exe_type
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exe.values.insert(0, exe_pop)
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elif array_cmd == 'append':
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res = execute_code(exe.get_code())
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if res is not None:
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sys_path.append(res)
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debug.dbg('sys path added: %s' % res)
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return sys_path
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if module.path is None:
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return [] # support for modules without a path is intentionally bad.
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curdir = os.path.abspath(os.curdir)
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try:
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os.chdir(os.path.dirname(module.path))
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except OSError:
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pass
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result = check_module(module)
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result += detect_django_path(module.path)
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# cleanup, back to old directory
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os.chdir(curdir)
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return result
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def detect_django_path(module_path):
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""" Detects the path of the very well known Django library (if used) """
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result = []
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while True:
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new = os.path.dirname(module_path)
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# If the module_path doesn't change anymore, we're finished -> /
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if new == module_path:
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break
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else:
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module_path = new
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try:
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with open(module_path + os.path.sep + 'manage.py'):
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debug.dbg('Found django path: %s' % module_path)
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result.append(module_path)
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except IOError:
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pass
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return result
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