forked from VimPlug/jedi
457 lines
15 KiB
Python
457 lines
15 KiB
Python
"""
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A big part of the Python standard libraries are unfortunately not only written
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in Python. The process works like this:
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- ``BuiltinModule`` imports the builtin module (e.g. ``sys``)
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- then ``BuiltinModule`` generates code with the docstrings of builtin
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functions.
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- The :mod:`parsing` parser processes the generated code.
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This is possible, because many builtin functions supply docstrings, for example
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the method ``list.index`` has the following attribute ``__doc__``:
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L.index(value, [start, [stop]]) -> integer -- return first index of value.
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Raises ValueError if the value is not present.
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`PEP 257 <http://www.python.org/dev/peps/pep-0257/#one-line-docstrings>`_
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teaches how docstrings should look like for C functions.
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Additionally there's a ``Builtin`` instance in this module, to make it
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possible to access functions like ``list`` and ``int`` directly, the same way
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|jedi| access other functions.
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"""
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from __future__ import with_statement
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from jedi._compatibility import exec_function, is_py3k
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import re
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import sys
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import os
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if is_py3k:
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import io
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import types
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import inspect
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from jedi import common
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from jedi import debug
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from jedi.parser import Parser
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from jedi.parser import fast
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from jedi import modules
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from jedi import cache
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class BuiltinModule(object):
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"""
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This module is a parser for all builtin modules, which are programmed in
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C/C++. It should also work on third party modules.
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It can be instantiated with either a path or a name of the module. The path
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is important for third party modules.
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:param name: The name of the module.
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:param path: The path of the module.
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:param sys_path: The sys.path, which is can be customizable.
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"""
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map_types = {
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'floating point number': '0.0',
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'string': '""',
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'str': '""',
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'character': '"a"',
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'integer': '0',
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'int': '0',
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'dictionary': '{}',
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'list': '[]',
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'file object': 'file("")',
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# TODO things like dbg: ('not working', 'tuple of integers')
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}
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if is_py3k:
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map_types['file object'] = 'import io; return io.TextIOWrapper()'
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def __init__(self, path=None, name=None, sys_path=None):
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if sys_path is None:
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sys_path = modules.get_sys_path()
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self.sys_path = list(sys_path)
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if not name:
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name = os.path.basename(path)
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name = name.rpartition('.')[0] # cut file type (normally .so)
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self.name = name
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self.path = path and os.path.abspath(path)
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@property
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@cache.underscore_memoization
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def parser(self):
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""" get the parser lazy """
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return cache.load_parser(self.path, self.name) or self._load_module()
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def _load_module(self):
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source = _generate_code(self.module, self._load_mixins())
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p = self.path or self.name
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p = fast.FastParser(source, p)
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cache.save_parser(self.path, self.name, p)
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return p
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@property
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@cache.underscore_memoization
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def module(self):
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"""get module also lazy"""
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def load_module(name, path):
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if path:
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self.sys_path.insert(0, path)
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temp, sys.path = sys.path, self.sys_path
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content = {}
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try:
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exec_function('import %s as module' % name, content)
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module = content['module']
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except AttributeError:
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# use sys.modules, because you cannot access some modules
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# directly. -> #59
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module = sys.modules[name]
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sys.path = temp
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if path:
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self.sys_path.pop(0)
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return module
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# module might already be defined
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path = self.path
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name = self.name
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if self.path:
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dot_path = []
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p = self.path
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# search for the builtin with the correct path
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while p and p not in sys.path:
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p, sep, mod = p.rpartition(os.path.sep)
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dot_path.append(mod.partition('.')[0])
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if p:
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name = ".".join(reversed(dot_path))
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path = p
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else:
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path = os.path.dirname(self.path)
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return load_module(name, path)
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def _load_mixins(self):
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"""
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Load functions that are mixed in to the standard library.
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E.g. builtins are written in C (binaries), but my autocompletion only
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understands Python code. By mixing in Python code, the autocompletion
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should work much better for builtins.
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"""
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regex = r'^(def|class)\s+([\w\d]+)'
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def process_code(code, depth=0):
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funcs = {}
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matches = list(re.finditer(regex, code, re.MULTILINE))
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positions = [m.start() for m in matches]
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for i, pos in enumerate(positions):
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try:
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code_block = code[pos:positions[i + 1]]
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except IndexError:
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code_block = code[pos:len(code)]
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structure_name = matches[i].group(1)
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name = matches[i].group(2)
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if structure_name == 'def':
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funcs[name] = code_block
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elif structure_name == 'class':
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if depth > 0:
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raise NotImplementedError()
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# remove class line
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c = re.sub(r'^[^\n]+', '', code_block)
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# remove whitespace
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c = re.compile(r'^[ ]{4}', re.MULTILINE).sub('', c)
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funcs[name] = process_code(c)
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else:
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raise NotImplementedError()
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return funcs
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name = self.name
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# sometimes there are stupid endings like `_sqlite3.cpython-32mu`
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name = re.sub(r'\..*', '', name)
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if name == '__builtin__' and not is_py3k:
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name = 'builtins'
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path = os.path.dirname(os.path.abspath(__file__))
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try:
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with open(os.path.join(path, 'mixin', name) + '.pym') as f:
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s = f.read()
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except IOError:
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return {}
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else:
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mixin_dct = process_code(s)
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if is_py3k and self.name == Builtin.name:
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# in the case of Py3k xrange is now range
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mixin_dct['range'] = mixin_dct['xrange']
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return mixin_dct
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def _generate_code(scope, mixin_funcs={}, depth=0):
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"""
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Generate a string, which uses python syntax as an input to the Parser.
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"""
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def get_doc(obj, indent=False):
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doc = inspect.getdoc(obj)
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if doc:
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doc = ('r"""\n%s\n"""\n' % doc)
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if indent:
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doc = common.indent_block(doc)
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return doc
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return ''
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def is_in_base_classes(cls, name, comparison):
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""" Base classes may contain the exact same object """
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if name in mixin_funcs:
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return False
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try:
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mro = cls.mro()
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except TypeError:
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# this happens, if cls == type
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return False
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for base in mro[1:]:
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try:
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attr = getattr(base, name)
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except AttributeError:
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continue
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if attr == comparison:
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return True
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return False
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def get_scope_objects(names):
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"""
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Looks for the names defined with dir() in an objects and divides
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them into different object types.
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"""
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classes = {}
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funcs = {}
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stmts = {}
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members = {}
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for n in names:
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try:
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# this has a builtin_function_or_method
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exe = getattr(scope, n)
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except AttributeError:
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# happens e.g. in properties of
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# PyQt4.QtGui.QStyleOptionComboBox.currentText
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# -> just set it to None
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members[n] = None
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else:
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if inspect.isclass(scope):
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if is_in_base_classes(scope, n, exe):
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continue
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if inspect.isbuiltin(exe) or inspect.ismethod(exe) \
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or inspect.ismethoddescriptor(exe):
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funcs[n] = exe
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elif inspect.isclass(exe) or inspect.ismodule(exe):
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classes[n] = exe
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elif inspect.ismemberdescriptor(exe):
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members[n] = exe
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else:
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stmts[n] = exe
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return classes, funcs, stmts, members
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code = ''
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if inspect.ismodule(scope): # generate comment where the code's from.
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try:
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path = scope.__file__
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except AttributeError:
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path = '?'
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code += '# Generated module %s from %s\n' % (scope.__name__, path)
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code += get_doc(scope)
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# Remove some magic vars, (TODO why?)
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names = set(dir(scope)) - set(['__file__', '__name__', '__doc__',
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'__path__', '__package__'])
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classes, funcs, stmts, members = get_scope_objects(names)
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# classes
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for name, cl in classes.items():
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bases = (c.__name__ for c in cl.__bases__) if inspect.isclass(cl) \
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else []
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code += 'class %s(%s):\n' % (name, ','.join(bases))
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if depth == 0:
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try:
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mixin = mixin_funcs[name]
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except KeyError:
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mixin = {}
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cl_code = _generate_code(cl, mixin, depth + 1)
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code += common.indent_block(cl_code)
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code += '\n'
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# functions
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for name, func in funcs.items():
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params, ret = _parse_function_doc(func)
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if depth > 0:
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params = 'self, ' + params
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doc_str = get_doc(func, indent=True)
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try:
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mixin = mixin_funcs[name]
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except KeyError:
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# normal code generation
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code += 'def %s(%s):\n' % (name, params)
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code += doc_str
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code += common.indent_block('%s\n\n' % ret)
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else:
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# generation of code with mixins
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# the parser only supports basic functions with a newline after
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# the double dots
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# find doc_str place
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try:
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pos = re.search(r'\):\s*\n', mixin).end()
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except TypeError:
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# pypy uses a different reversed builtin
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if name == 'reversed':
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mixin = 'def reversed(sequence):\n' \
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' for i in self.__sequence: yield i'
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pos = 24
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else:
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debug.warning('mixin trouble in pypy: %s', name)
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raise
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if pos is None:
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raise Exception("Builtin function not parsed correctly")
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code += mixin[:pos] + doc_str + mixin[pos:]
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# class members (functions) properties?
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for name, func in members.items():
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# recursion problem in properties TODO remove
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if name in ['fget', 'fset', 'fdel']:
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continue
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ret = 'pass'
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code += '@property\ndef %s(self):\n' % (name)
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code += common.indent_block(get_doc(func) + '%s\n\n' % ret)
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# variables
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for name, value in stmts.items():
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if is_py3k:
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file_type = io.TextIOWrapper
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else:
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file_type = types.FileType
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if isinstance(value, file_type):
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value = 'open()'
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elif name == 'None':
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value = ''
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elif type(value).__name__ in ['int', 'bool', 'float',
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'dict', 'list', 'tuple']:
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value = repr(value)
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else:
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# get the type, if the type is not simple.
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mod = type(value).__module__
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value = type(value).__name__ + '()'
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if mod != '__builtin__':
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value = '%s.%s' % (mod, value)
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code += '%s = %s\n' % (name, value)
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return code
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def _parse_function_doc(func):
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"""
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Takes a function and returns the params and return value as a tuple.
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This is nothing more than a docstring parser.
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"""
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# TODO: things like utime(path, (atime, mtime)) and a(b [, b]) -> None
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doc = inspect.getdoc(func)
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if doc is None:
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return '', 'pass'
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# get full string, parse round parentheses: def func(a, (b,c))
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try:
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# unbound methods such as pyqtSignals have no __name__
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if not hasattr(func, "__name__"):
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return '', 'pass'
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count = 0
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debug.dbg(func, func.__name__, doc)
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start = doc.index('(')
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for i, s in enumerate(doc[start:]):
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if s == '(':
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count += 1
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elif s == ')':
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count -= 1
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if count == 0:
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end = start + i
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break
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param_str = doc[start + 1:end]
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except (ValueError, UnboundLocalError):
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# ValueError for doc.index
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# UnboundLocalError for undefined end in last line
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debug.dbg('no brackets found - no param')
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end = 0
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param_str = ''
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else:
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# remove square brackets, that show an optional param ( = None)
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def change_options(m):
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args = m.group(1).split(',')
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for i, a in enumerate(args):
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if a and '=' not in a:
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args[i] += '=None'
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return ','.join(args)
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while True:
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param_str, changes = re.subn(r' ?\[([^\[\]]+)\]',
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change_options, param_str)
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if changes == 0:
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break
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param_str = param_str.replace('-', '_') # see: isinstance.__doc__
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# parse return value
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r = re.search('-[>-]* ', doc[end:end + 7])
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if r is None:
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ret = ''
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else:
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index = end + r.end()
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# get result type, which can contain newlines
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pattern = re.compile(r'(,\n|[^\n-])+')
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ret_str = pattern.match(doc, index).group(0).strip()
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# New object -> object()
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ret_str = re.sub(r'[nN]ew (.*)', r'\1()', ret_str)
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ret = BuiltinModule.map_types.get(ret_str, ret_str)
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if ret == ret_str and ret not in ['None', 'object', 'tuple', 'set']:
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debug.dbg('not working', ret_str)
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ret = ('return ' if 'return' not in ret else '') + ret
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return param_str, ret
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class Builtin(object):
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""" The builtin scope / module """
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# Python 3 compatibility
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if is_py3k:
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name = 'builtins'
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else:
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name = '__builtin__'
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@property
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@cache.underscore_memoization
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def builtin(self):
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return BuiltinModule(name=self.name)
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@property
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def scope(self):
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return self.builtin.parser.module
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def magic_function_scope(self, evaluator):
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try:
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return self._magic_function_scope
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except AttributeError:
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# depth = 1 because this is not a module
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class Container(object):
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FunctionType = types.FunctionType
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source = _generate_code(Container, depth=0)
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parser = Parser(source, None)
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module = parser.module
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module.parent = self.scope
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typ = evaluator.follow_path(iter(['FunctionType']), [module], module)
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s = self._magic_function_scope = typ.pop()
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return s
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Builtin = Builtin()
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