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227 lines
8.0 KiB
227 lines
8.0 KiB
import os
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from jedi._compatibility import unicode, force_unicode, all_suffixes
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from jedi.evaluate.cache import evaluator_method_cache
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from jedi.evaluate.base_context import ContextualizedNode
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from jedi.evaluate.helpers import is_string
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from jedi.common.utils import traverse_parents
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from jedi.parser_utils import get_cached_code_lines
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from jedi import settings
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from jedi import debug
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def _abs_path(module_context, path):
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if os.path.isabs(path):
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return path
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module_path = module_context.py__file__()
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if module_path is None:
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# In this case we have no idea where we actually are in the file
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# system.
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return None
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base_dir = os.path.dirname(module_path)
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path = force_unicode(path)
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return os.path.abspath(os.path.join(base_dir, path))
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def _paths_from_assignment(module_context, expr_stmt):
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"""
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Extracts the assigned strings from an assignment that looks as follows::
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sys.path[0:0] = ['module/path', 'another/module/path']
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This function is in general pretty tolerant (and therefore 'buggy').
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However, it's not a big issue usually to add more paths to Jedi's sys_path,
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because it will only affect Jedi in very random situations and by adding
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more paths than necessary, it usually benefits the general user.
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"""
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for assignee, operator in zip(expr_stmt.children[::2], expr_stmt.children[1::2]):
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try:
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assert operator in ['=', '+=']
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assert assignee.type in ('power', 'atom_expr') and \
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len(assignee.children) > 1
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c = assignee.children
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assert c[0].type == 'name' and c[0].value == 'sys'
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trailer = c[1]
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assert trailer.children[0] == '.' and trailer.children[1].value == 'path'
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# TODO Essentially we're not checking details on sys.path
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# manipulation. Both assigment of the sys.path and changing/adding
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# parts of the sys.path are the same: They get added to the end of
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# the current sys.path.
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"""
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execution = c[2]
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assert execution.children[0] == '['
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subscript = execution.children[1]
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assert subscript.type == 'subscript'
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assert ':' in subscript.children
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"""
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except AssertionError:
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continue
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cn = ContextualizedNode(module_context.create_context(expr_stmt), expr_stmt)
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for lazy_context in cn.infer().iterate(cn):
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for context in lazy_context.infer():
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if is_string(context):
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abs_path = _abs_path(module_context, context.get_safe_value())
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if abs_path is not None:
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yield abs_path
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def _paths_from_list_modifications(module_context, trailer1, trailer2):
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""" extract the path from either "sys.path.append" or "sys.path.insert" """
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# Guarantee that both are trailers, the first one a name and the second one
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# a function execution with at least one param.
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if not (trailer1.type == 'trailer' and trailer1.children[0] == '.'
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and trailer2.type == 'trailer' and trailer2.children[0] == '('
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and len(trailer2.children) == 3):
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return
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name = trailer1.children[1].value
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if name not in ['insert', 'append']:
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return
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arg = trailer2.children[1]
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if name == 'insert' and len(arg.children) in (3, 4): # Possible trailing comma.
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arg = arg.children[2]
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for context in module_context.create_context(arg).eval_node(arg):
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if is_string(context):
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abs_path = _abs_path(module_context, context.get_safe_value())
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if abs_path is not None:
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yield abs_path
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@evaluator_method_cache(default=[])
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def check_sys_path_modifications(module_context):
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"""
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Detect sys.path modifications within module.
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"""
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def get_sys_path_powers(names):
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for name in names:
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power = name.parent.parent
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if power.type in ('power', 'atom_expr'):
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c = power.children
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if c[0].type == 'name' and c[0].value == 'sys' \
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and c[1].type == 'trailer':
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n = c[1].children[1]
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if n.type == 'name' and n.value == 'path':
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yield name, power
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if module_context.tree_node is None:
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return []
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added = []
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try:
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possible_names = module_context.tree_node.get_used_names()['path']
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except KeyError:
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pass
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else:
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for name, power in get_sys_path_powers(possible_names):
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expr_stmt = power.parent
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if len(power.children) >= 4:
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added.extend(
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_paths_from_list_modifications(
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module_context, *power.children[2:4]
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)
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)
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elif expr_stmt is not None and expr_stmt.type == 'expr_stmt':
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added.extend(_paths_from_assignment(module_context, expr_stmt))
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return added
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def discover_buildout_paths(evaluator, script_path):
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buildout_script_paths = set()
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for buildout_script_path in _get_buildout_script_paths(script_path):
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for path in _get_paths_from_buildout_script(evaluator, buildout_script_path):
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buildout_script_paths.add(path)
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return buildout_script_paths
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def _get_paths_from_buildout_script(evaluator, buildout_script_path):
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try:
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module_node = evaluator.parse(
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path=buildout_script_path,
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cache=True,
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cache_path=settings.cache_directory
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)
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except IOError:
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debug.warning('Error trying to read buildout_script: %s', buildout_script_path)
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return
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from jedi.evaluate.context import ModuleContext
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module = ModuleContext(
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evaluator, module_node, buildout_script_path,
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code_lines=get_cached_code_lines(evaluator.grammar, buildout_script_path),
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)
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for path in check_sys_path_modifications(module):
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yield path
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def _get_parent_dir_with_file(path, filename):
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for parent in traverse_parents(path):
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if os.path.isfile(os.path.join(parent, filename)):
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return parent
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return None
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def _get_buildout_script_paths(search_path):
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"""
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if there is a 'buildout.cfg' file in one of the parent directories of the
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given module it will return a list of all files in the buildout bin
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directory that look like python files.
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:param search_path: absolute path to the module.
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:type search_path: str
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"""
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project_root = _get_parent_dir_with_file(search_path, 'buildout.cfg')
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if not project_root:
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return
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bin_path = os.path.join(project_root, 'bin')
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if not os.path.exists(bin_path):
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return
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for filename in os.listdir(bin_path):
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try:
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filepath = os.path.join(bin_path, filename)
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with open(filepath, 'r') as f:
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firstline = f.readline()
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if firstline.startswith('#!') and 'python' in firstline:
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yield filepath
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except (UnicodeDecodeError, IOError) as e:
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# Probably a binary file; permission error or race cond. because
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# file got deleted. Ignore it.
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debug.warning(unicode(e))
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continue
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def dotted_path_in_sys_path(sys_path, module_path):
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"""
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Returns the dotted path inside a sys.path as a list of names.
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"""
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# First remove the suffix.
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for suffix in all_suffixes():
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if module_path.endswith(suffix):
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module_path = module_path[:-len(suffix)]
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break
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else:
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# There should always be a suffix in a valid Python file on the path.
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return None
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if module_path.startswith(os.path.sep):
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# The paths in sys.path most of the times don't end with a slash.
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module_path = module_path[1:]
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for p in sys_path:
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if module_path.startswith(p):
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rest = module_path[len(p):]
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if rest:
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split = rest.split(os.path.sep)
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for string in split:
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if not string or '.' in string:
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return None
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return split
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return None
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