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https://github.com/davidhalter/jedi.git
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1493 lines
53 KiB
Python
1493 lines
53 KiB
Python
"""
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Maintainer: David Halter <davidhalter88@gmail.com>
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Version: 0.1
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py_fuzzyparser parses python code, with the goal of a good representation of
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the code within a tree structure. Variables, Classes and Functions are defined
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within this tree structure, containing their exact locations in the code.
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It is also a primary goal to work with code which contains syntax errors.
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This behaviour may be used to refactor, modify, search and complete code.
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To understand this code it is extremely important to understand the behaviour
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of the python module 'tokenize'.
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This original codebase of this parser, which has been refactored and heavily
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changed, was programmed by Aaron Griffin <aaronmgriffin@gmail.com>.
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**The structure of the following script:**
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A Scope has
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- imports (Import)
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- subscopes (Scope, Class, Function, Flow)
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- statements (Statement)
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All those classes are being generated by PyFuzzyParser, which takes python text
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as input.
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Ignored statements:
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- print (no use for it, just slows down)
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- exec (dangerous - not controllable)
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"""
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from _compatibility import (next, literal_eval, tokenize_func, BytesIO,
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property, is_py3k)
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import tokenize
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import re
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import keyword
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import debug
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class ParserError(Exception):
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pass
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def indent_block(text, indention=" "):
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""" This function indents a text block with a default of four spaces """
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temp = ''
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while text and text[-1] == '\n':
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temp += text[-1]
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text = text[:-1]
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lines = text.split('\n')
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return '\n'.join(map(lambda s: indention + s, lines)) + temp
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class Simple(object):
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"""
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The super class for Scope, Import, Name and Statement. Every object in
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the parser tree inherits from this class.
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"""
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def __init__(self, start_pos, end_pos=(None, None)):
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self.start_pos = start_pos
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self.end_pos = end_pos
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self.parent = None
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def get_parent_until(self, *classes):
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""" Takes always the parent, until one class (not a Class) """
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scope = self
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while not (scope.parent is None or scope.__class__ in classes):
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scope = scope.parent
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return scope
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def __repr__(self):
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code = self.get_code().replace('\n', ' ')
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return "<%s: %s@%s>" % \
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(self.__class__.__name__, code, self.start_pos[0])
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class Scope(Simple):
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"""
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Super class for the parser tree, which represents the state of a python
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text file.
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A Scope manages and owns its subscopes, which are classes and functions, as
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well as variables and imports. It is used to access the structure of python
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files.
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:param start_pos: The position (line and column) of the scope.
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:type start_pos: tuple(int, int)
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:param docstr: The docstring for the current Scope.
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:type docstr: str
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"""
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def __init__(self, start_pos, docstr=''):
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super(Scope, self).__init__(start_pos)
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self.subscopes = []
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self.imports = []
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self.statements = []
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self.docstr = docstr
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def add_scope(self, sub, decorators):
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# print 'push scope: [%s@%s]' % sub.start_pos
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sub.parent = self
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sub.decorators = decorators
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for d in decorators:
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# the parent is the same, because the decorator has not the scope
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# of the function
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d.parent = sub.parent
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self.subscopes.append(sub)
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return sub
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def add_statement(self, stmt):
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"""
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Used to add a Statement or a Scope.
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A statement would be a normal command (Statement) or a Scope (Flow).
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"""
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stmt.parent = self
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self.statements.append(stmt)
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return stmt
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def add_docstr(self, string):
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""" Clean up a docstring """
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# TODO use prefixes, to format the doc strings -> inspect.cleandoc
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# scan for string prefixes like r, u, etc.
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index1 = string.find("'")
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index2 = string.find('"')
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index = index1 if index1 < index2 and index1 > -1 else index2
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prefix = string[:index]
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d = string[index:]
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debug.dbg('add_docstr', d, prefix)
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# now clean docstr
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d = d.replace('\n', ' ')
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d = d.replace('\t', ' ')
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while d.find(' ') > -1:
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d = d.replace(' ', ' ')
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while d[0] in '"\'\t ':
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d = d[1:]
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while d[-1] in '"\'\t ':
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d = d[:-1]
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debug.dbg("Scope(%s)::docstr = %s" % (self, d))
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self.docstr = d
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def add_import(self, imp):
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self.imports.append(imp)
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imp.parent = self
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def get_imports(self):
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""" Gets also the imports within flow statements """
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i = [] + self.imports
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for s in self.statements:
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if isinstance(s, Scope):
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i += s.get_imports()
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return i
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def get_code(self, first_indent=False, indention=" "):
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"""
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:return: Returns the code of the current scope.
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:rtype: str
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"""
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string = ""
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if len(self.docstr) > 0:
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string += '"""' + self.docstr + '"""\n'
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for i in self.imports:
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string += i.get_code()
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for sub in self.subscopes:
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string += sub.get_code(first_indent=True, indention=indention)
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for stmt in self.statements:
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string += stmt.get_code()
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if first_indent:
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string = indent_block(string, indention=indention)
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return string
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def get_set_vars(self):
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"""
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Get all the names, that are active and accessible in the current
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scope.
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:return: list of Name
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:rtype: list
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"""
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return self._get_set_vars(self)
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@staticmethod
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def _get_set_vars(self):
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"""
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This is a hack, because Python 2 has another understanding of methods,
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than Python 3. In Python 2 it is not possible to use a method without
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the `self` being an instance of the class.
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"""
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n = []
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for stmt in self.statements:
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try:
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n += stmt.get_set_vars(True)
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except TypeError:
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n += stmt.get_set_vars()
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# function and class names
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n += [s.name for s in self.subscopes]
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for i in self.imports:
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if not i.star:
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n += i.get_defined_names()
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return n
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def get_defined_names(self):
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return [n for n in self.get_set_vars() \
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if isinstance(n, Import) or len(n) == 1]
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def is_empty(self):
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"""
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:return: True if there are no subscopes, imports and statements.
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:rtype: bool
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"""
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return not (self.imports or self.subscopes or self.statements)
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def __repr__(self):
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try:
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name = self.name
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except AttributeError:
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try:
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name = self.command
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except AttributeError:
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name = self.path
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return "<%s: %s@%s-%s>" % (self.__class__.__name__, name,
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self.start_pos[0], self.end_pos[0])
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class Module(Scope):
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"""
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The top scope, which is always a module.
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"""
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def __init__(self, path, docstr=''):
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super(Module, self).__init__((1, 0), docstr)
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self.path = path
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self.global_vars = []
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def add_global(self, name):
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"""
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Global means in these context a function (subscope) which has a global
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statement.
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This is only relevant for the top scope.
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:param name: The name of the global.
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:type name: Name
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"""
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self.global_vars.append(name)
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# set no parent here, because globals are not defined in this scope.
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def get_set_vars(self):
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n = super(Module, self).get_set_vars()
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n += self.global_vars
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return n
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class Class(Scope):
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"""
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Used to store the parsed contents of a python class.
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:param name: The Class name.
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:type name: string
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:param supers: The super classes of a Class.
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:type supers: list
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:param start_pos: The start position (line, column) of the class.
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:type start_pos: tuple(int, int)
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:param docstr: The docstring for the current Scope.
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:type docstr: str
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"""
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def __init__(self, name, supers, start_pos, docstr=''):
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super(Class, self).__init__(start_pos, docstr)
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self.name = name
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name.parent = self
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self.supers = supers
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for s in self.supers:
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s.parent = self
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self.decorators = []
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def get_code(self, first_indent=False, indention=" "):
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str = "\n".join('@' + stmt.get_code() for stmt in self.decorators)
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str += 'class %s' % (self.name)
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if len(self.supers) > 0:
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sup = ','.join(stmt.code for stmt in self.supers)
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str += '(%s)' % sup
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str += ':\n'
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str += super(Class, self).get_code(True, indention)
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if self.is_empty():
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str += "pass\n"
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return str
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class Function(Scope):
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"""
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Used to store the parsed contents of a python function.
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:param name: The Function name.
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:type name: string
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:param params: The parameters (Statement) of a Function.
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:type params: list
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:param start_pos: The start position (line, column) the Function.
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:type start_pos: tuple(int, int)
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:param docstr: The docstring for the current Scope.
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:type docstr: str
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"""
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def __init__(self, name, params, start_pos, docstr=''):
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Scope.__init__(self, start_pos, docstr)
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self.name = name
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name.parent = self
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self.params = params
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for p in params:
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p.parent = self
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self.decorators = []
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self.returns = []
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self.is_generator = False
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def get_code(self, first_indent=False, indention=" "):
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str = "\n".join('@' + stmt.get_code() for stmt in self.decorators)
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params = ','.join([stmt.code for stmt in self.params])
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str += "def %s(%s):\n" % (self.name, params)
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str += super(Function, self).get_code(True, indention)
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if self.is_empty():
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str += "pass\n"
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return str
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def get_set_vars(self):
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n = super(Function, self).get_set_vars()
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for p in self.params:
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try:
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n.append(p.get_name())
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except IndexError:
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debug.warning("multiple names in param %s" % n)
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return n
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class Flow(Scope):
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"""
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Used to describe programming structure - flow statements,
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which indent code, but are not classes or functions:
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- for
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- while
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- if
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- try
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- with
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Therefore statements like else, except and finally are also here,
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they are now saved in the root flow elements, but in the next variable.
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:param command: The flow command, if, while, else, etc.
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:type command: str
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:param inits: The initializations of a flow -> while 'statement'.
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:type inits: list(Statement)
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:param start_pos: Position (line, column) of the Flow statement.
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:type start_pos: tuple(int, int)
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:param set_vars: Local variables used in the for loop (only there).
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:type set_vars: list
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"""
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def __init__(self, command, inits, start_pos, set_vars=None):
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self._parent = None
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self.next = None
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super(Flow, self).__init__(start_pos, '')
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self.command = command
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# These have to be statements, because of with, which takes multiple.
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self.inits = inits
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for s in inits:
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s.parent = self
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if set_vars == None:
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self.set_vars = []
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else:
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self.set_vars = set_vars
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for s in self.set_vars:
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s.parent = self
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@property
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def parent(self):
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return self._parent
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@parent.setter
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def parent(self, value):
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self._parent = value
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if self.next:
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self.next.parent = value
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def get_code(self, first_indent=False, indention=" "):
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if self.set_vars:
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vars = ",".join(map(lambda x: x.get_code(), self.set_vars))
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vars += ' in '
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else:
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vars = ''
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stmts = []
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for s in self.inits:
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stmts.append(s.get_code(new_line=False))
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stmt = ', '.join(stmts)
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str = "%s %s%s:\n" % (self.command, vars, stmt)
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str += super(Flow, self).get_code(True, indention)
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if self.next:
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str += self.next.get_code()
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return str
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def get_set_vars(self, is_internal_call=False):
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"""
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Get the names for the flow. This includes also a call to the super
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class.
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:param is_internal_call: defines an option for internal files to crawl\
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through this class. Normally it will just call its superiors, to\
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generate the output.
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"""
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if is_internal_call:
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n = list(self.set_vars)
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for s in self.inits:
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n += s.set_vars
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if self.next:
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n += self.next.get_set_vars(is_internal_call)
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n += super(Flow, self).get_set_vars()
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return n
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else:
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return self.get_parent_until(Class, Function).get_set_vars()
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def get_imports(self):
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i = super(Flow, self).get_imports()
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if self.next:
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i += self.next.get_imports()
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return i
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def set_next(self, next):
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""" Set the next element in the flow, those are else, except, etc. """
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if self.next:
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return self.next.set_next(next)
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else:
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self.next = next
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next.parent = self.parent
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return next
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|
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class ForFlow(Flow):
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"""
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Used for the for loop, because there are two statement parts.
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"""
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def __init__(self, command, inits, start_pos, set_stmt):
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super(ForFlow, self).__init__(command, inits, start_pos,
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set_stmt.used_vars)
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self.set_stmt = set_stmt
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|
|
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class Import(Simple):
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"""
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Stores the imports of any Scopes.
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|
>>> 1+1
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2
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:param start_pos: Position (line, column) of the Import.
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:type start_pos: tuple(int, int)
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:param namespace: The import, can be empty if a star is given
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:type namespace: Name
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:param alias: The alias of a namespace(valid in the current namespace).
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:type alias: Name
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:param from_ns: Like the namespace, can be equally used.
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:type from_ns: Name
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:param star: If a star is used -> from time import *.
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:type star: bool
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:param defunct: An Import is valid or not.
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:type defunct: bool
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|
"""
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def __init__(self, start_pos, end_pos, namespace, alias='', from_ns='', \
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star=False, relative_count=None, defunct=False):
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super(Import, self).__init__(start_pos, end_pos)
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self.namespace = namespace
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if namespace:
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namespace.parent = self
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|
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self.alias = alias
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|
if alias:
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alias.parent = self
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|
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|
self.from_ns = from_ns
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|
if from_ns:
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from_ns.parent = self
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|
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|
self.star = star
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|
self.relative_count = relative_count
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self.defunct = defunct
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|
|
|
def get_code(self):
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|
if self.alias:
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|
ns_str = "%s as %s" % (self.namespace, self.alias)
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|
else:
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|
ns_str = str(self.namespace)
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|
if self.from_ns:
|
|
if self.star:
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|
ns_str = '*'
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|
return "from %s import %s" % (self.from_ns, ns_str) + '\n'
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|
else:
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|
return "import " + ns_str + '\n'
|
|
|
|
def get_defined_names(self):
|
|
if self.defunct:
|
|
return []
|
|
if self.star:
|
|
return [self]
|
|
return [self.alias] if self.alias else [self.namespace]
|
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|
|
|
|
class Statement(Simple):
|
|
"""
|
|
This is the class for all the possible statements. Which means, this class
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|
stores pretty much all the Python code, except functions, classes, imports,
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|
and flow functions like if, for, etc.
|
|
|
|
:param code: The full code of a statement. This is import, if one wants \
|
|
to execute the code at some level.
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|
:param code: str
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|
:param set_vars: The variables which are defined by the statement.
|
|
:param set_vars: str
|
|
:param used_funcs: The functions which are used by the statement.
|
|
:param used_funcs: str
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|
:param used_vars: The variables which are used by the statement.
|
|
:param used_vars: str
|
|
:param token_list: Token list which is also peppered with Name.
|
|
:param token_list: list
|
|
:param start_pos: Position (line, column) of the Statement.
|
|
:type start_pos: tuple(int, int)
|
|
"""
|
|
def __init__(self, code, set_vars, used_funcs, used_vars, token_list,
|
|
start_pos, end_pos):
|
|
super(Statement, self).__init__(start_pos, end_pos)
|
|
self.code = code
|
|
self.set_vars = set_vars
|
|
self.used_funcs = used_funcs
|
|
self.used_vars = used_vars
|
|
self.token_list = token_list
|
|
for s in set_vars + used_funcs + used_vars:
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|
s.parent = self
|
|
|
|
# cache
|
|
self._assignment_calls = None
|
|
self._assignment_details = None
|
|
# this is important for other scripts
|
|
self._assignment_calls_calculated = False
|
|
|
|
def get_code(self, new_line=True):
|
|
if new_line:
|
|
return self.code + '\n'
|
|
else:
|
|
return self.code
|
|
|
|
def get_set_vars(self):
|
|
""" Get the names for the statement. """
|
|
return list(self.set_vars)
|
|
|
|
@property
|
|
def assignment_details(self):
|
|
if self._assignment_details is None:
|
|
# normally, this calls sets this variable
|
|
self.get_assignment_calls()
|
|
# it may not have been set by get_assignment_calls -> just use an empty
|
|
# array
|
|
return self._assignment_details or []
|
|
|
|
def is_global(self):
|
|
# first keyword of the first token is global -> must be a global
|
|
return str(self.token_list[0]) == "global"
|
|
|
|
def get_assignment_calls(self):
|
|
"""
|
|
This is not done in the main parser, because it might be slow and
|
|
most of the statements won't need this data anyway. This is something
|
|
'like' a lazy execution.
|
|
|
|
This is not really nice written, sorry for that. If you plan to replace
|
|
it and make it nicer, that would be cool :-)
|
|
"""
|
|
if self._assignment_calls_calculated:
|
|
return self._assignment_calls
|
|
self._assignment_details = []
|
|
result = Array(Array.NOARRAY, self)
|
|
top = result
|
|
level = 0
|
|
is_chain = False
|
|
close_brackets = False
|
|
|
|
debug.dbg('tok_list', self.token_list)
|
|
tok_iter = enumerate(self.token_list)
|
|
for i, tok_temp in tok_iter:
|
|
#print 'tok', tok_temp, result
|
|
try:
|
|
token_type, tok = tok_temp
|
|
except TypeError:
|
|
# the token is a Name, which has already been parsed
|
|
tok = tok_temp
|
|
token_type = None
|
|
except ValueError:
|
|
debug.warning("unkown value, shouldn't happen",
|
|
tok_temp, type(tok_temp))
|
|
raise
|
|
else:
|
|
if tok in ['return', 'yield'] or level == 0 and \
|
|
'=' in tok and not tok in ['>=', '<=', '==', '!=']:
|
|
# This means, there is an assignment here.
|
|
|
|
# Add assignments, which can be more than one
|
|
self._assignment_details.append((tok, top))
|
|
# All these calls wouldn't be important if nonlocal would
|
|
# exist. -> Initialize the first item again.
|
|
result = Array(Array.NOARRAY, self)
|
|
top = result
|
|
level = 0
|
|
close_brackets = False
|
|
is_chain = False
|
|
continue
|
|
elif tok == 'as':
|
|
next(tok_iter)
|
|
continue
|
|
|
|
brackets = {'(': Array.TUPLE, '[': Array.LIST, '{': Array.SET}
|
|
is_call = lambda: result.__class__ == Call
|
|
is_call_or_close = lambda: is_call() or close_brackets
|
|
|
|
is_literal = token_type in [tokenize.STRING, tokenize.NUMBER]
|
|
if isinstance(tok, Name) or is_literal:
|
|
c_type = Call.NAME
|
|
if is_literal:
|
|
tok = literal_eval(tok)
|
|
if token_type == tokenize.STRING:
|
|
c_type = Call.STRING
|
|
elif token_type == tokenize.NUMBER:
|
|
c_type = Call.NUMBER
|
|
|
|
if is_chain:
|
|
call = Call(tok, c_type, parent=result)
|
|
result = result.set_next_chain_call(call)
|
|
is_chain = False
|
|
close_brackets = False
|
|
else:
|
|
if close_brackets:
|
|
result = result.parent
|
|
close_brackets = False
|
|
if result.__class__ == Call:
|
|
result = result.parent
|
|
close_brackets = False
|
|
call = Call(tok, c_type, parent=result)
|
|
result.add_to_current_field(call)
|
|
result = call
|
|
elif tok in brackets.keys(): # brackets
|
|
level += 1
|
|
if is_call_or_close():
|
|
result = Array(brackets[tok], parent=result)
|
|
result = result.parent.add_execution(result)
|
|
close_brackets = False
|
|
else:
|
|
result = Array(brackets[tok], parent=result)
|
|
result.parent.add_to_current_field(result)
|
|
elif tok == ':':
|
|
if is_call_or_close():
|
|
result = result.parent
|
|
close_brackets = False
|
|
if result.type == Array.LIST: # [:] lookups
|
|
result.add_to_current_field(tok)
|
|
else:
|
|
result.add_dictionary_key()
|
|
elif tok == '.':
|
|
if close_brackets and result.parent != top:
|
|
# only get out of the array, if it is a array execution
|
|
result = result.parent
|
|
close_brackets = False
|
|
is_chain = True
|
|
elif tok == ',':
|
|
while is_call_or_close():
|
|
result = result.parent
|
|
close_brackets = False
|
|
result.add_field()
|
|
# important - it cannot be empty anymore
|
|
if result.type == Array.NOARRAY:
|
|
result.type = Array.TUPLE
|
|
elif tok in [')', '}', ']']:
|
|
while is_call_or_close():
|
|
result = result.parent
|
|
close_brackets = False
|
|
if tok == '}' and not len(result):
|
|
# this is a really special case - empty brackets {} are
|
|
# always dictionaries and not sets.
|
|
result.type = Array.DICT
|
|
level -= 1
|
|
#result = result.parent
|
|
close_brackets = True
|
|
else:
|
|
while is_call_or_close():
|
|
result = result.parent
|
|
close_brackets = False
|
|
result.add_to_current_field(tok)
|
|
|
|
#print 'tok_end', tok_temp, result, close_brackets
|
|
|
|
if level != 0:
|
|
raise ParserError("Brackets don't match: %s. This is not normal "
|
|
"behaviour. Please submit a bug" % level)
|
|
|
|
self._assignment_calls = top
|
|
return top
|
|
|
|
|
|
class Param(Statement):
|
|
"""
|
|
The class which shows definitions of params of classes and functions.
|
|
But this is not to define function calls.
|
|
"""
|
|
def __init__(self, code, set_vars, used_funcs, used_vars, token_list,
|
|
start_pos, end_pos):
|
|
super(Param, self).__init__(code, set_vars, used_funcs,
|
|
used_vars, token_list, start_pos, end_pos)
|
|
|
|
# this is defined by the parser later on, not at the initialization
|
|
# it is the position in the call (first argument, second...)
|
|
self.position = None
|
|
|
|
def get_name(self):
|
|
""" get the name of the param """
|
|
n = self.set_vars or self.used_vars
|
|
if len(n) > 1:
|
|
raise IndexError("Multiple param names (%s)." % n)
|
|
return n[0]
|
|
|
|
|
|
class Call(object):
|
|
"""
|
|
TODO doc
|
|
"""
|
|
NAME = 1
|
|
NUMBER = 2
|
|
STRING = 3
|
|
|
|
""" The statement object of functions, to """
|
|
def __init__(self, name, type, parent_stmt=None, parent=None):
|
|
self.name = name
|
|
# parent is not the oposite of next. The parent of c: a = [b.c] would
|
|
# be an array.
|
|
self.parent = parent
|
|
self.type = type
|
|
|
|
self.next = None
|
|
self.execution = None
|
|
self._parent_stmt = parent_stmt
|
|
|
|
@property
|
|
def parent_stmt(self):
|
|
if self._parent_stmt:
|
|
return self._parent_stmt
|
|
elif self.parent:
|
|
return self.parent.parent_stmt
|
|
else:
|
|
return None
|
|
|
|
@parent_stmt.setter
|
|
def parent_stmt(self, value):
|
|
self._parent_stmt = value
|
|
|
|
def set_next_chain_call(self, call):
|
|
""" Adds another part of the statement"""
|
|
self.next = call
|
|
#print '\n\npar', call.parent, self.parent, type(call), type(self)
|
|
call.parent = self.parent
|
|
return call
|
|
|
|
def add_execution(self, call):
|
|
"""
|
|
An execution is nothing else than brackets, with params in them, which
|
|
shows access on the internals of this name.
|
|
"""
|
|
self.execution = call
|
|
# there might be multiple executions, like a()[0], in that case, they
|
|
# have the same parent. Otherwise it's not possible to parse proper.
|
|
if self.parent.execution == self:
|
|
call.parent = self.parent
|
|
else:
|
|
call.parent = self
|
|
return call
|
|
|
|
def generate_call_list(self):
|
|
try:
|
|
for name_part in self.name.names:
|
|
yield name_part
|
|
except AttributeError:
|
|
yield self
|
|
if self.execution is not None:
|
|
for y in self.execution.generate_call_list():
|
|
yield y
|
|
if self.next is not None:
|
|
for y in self.next.generate_call_list():
|
|
yield y
|
|
|
|
def __repr__(self):
|
|
return "<%s: %s>" % \
|
|
(self.__class__.__name__, self.name)
|
|
|
|
|
|
class Array(Call):
|
|
"""
|
|
Describes the different python types for an array, but also empty
|
|
statements. In the Python syntax definitions this type is named 'atom'.
|
|
http://docs.python.org/release/3.0.1/reference/grammar.html
|
|
Array saves sub-arrays as well as normal operators and calls to methods.
|
|
|
|
:param array_type: The type of an array, which can be one of the constants\
|
|
below.
|
|
:type array_type: int
|
|
"""
|
|
NOARRAY = None
|
|
TUPLE = 'tuple'
|
|
LIST = 'list'
|
|
DICT = 'dict'
|
|
SET = 'set'
|
|
|
|
def __init__(self, arr_type, parent_stmt=None, parent=None, values=None):
|
|
super(Array, self).__init__(None, arr_type, parent_stmt, parent)
|
|
|
|
self.values = values if values else []
|
|
self.keys = []
|
|
|
|
def add_field(self):
|
|
"""
|
|
Just add a new field to the values.
|
|
|
|
Each value has a sub-array, because there may be different tokens in
|
|
one array.
|
|
"""
|
|
self.values.append([])
|
|
|
|
def add_to_current_field(self, tok):
|
|
""" Adds a token to the latest field (in content). """
|
|
if not self.values:
|
|
# An empty round brace is just a tuple, filled it is unnecessary.
|
|
if self.type == Array.TUPLE:
|
|
self.type = Array.NOARRAY
|
|
# Add the first field, this is done here, because if nothing
|
|
# gets added, the list is empty, which is also needed sometimes.
|
|
self.values.append([])
|
|
self.values[-1].append(tok)
|
|
|
|
def add_dictionary_key(self):
|
|
"""
|
|
Only used for dictionaries, automatically adds the tokens added by now
|
|
from the values to keys, because the parser works this way.
|
|
"""
|
|
self.type = Array.DICT
|
|
self.keys.append(self.values.pop())
|
|
self.values.append([])
|
|
|
|
def get_only_subelement(self):
|
|
"""
|
|
Returns the only element that an array contains. If it contains
|
|
more than one element, raise an exception.
|
|
"""
|
|
if len(self.values) != 1 or len(self.values[0]) != 1:
|
|
raise AttributeError("More than one value found")
|
|
return self.values[0][0]
|
|
|
|
@staticmethod
|
|
def is_type(instance, *types):
|
|
"""
|
|
This is not only used for calls on the actual object, but for
|
|
ducktyping, to invoke this function with anything as `self`.
|
|
"""
|
|
if isinstance(instance, Array):
|
|
if instance.type in types:
|
|
return True
|
|
return False
|
|
|
|
def __len__(self):
|
|
return len(self.values)
|
|
|
|
def __getitem__(self, key):
|
|
return self.values[key]
|
|
|
|
def __iter__(self):
|
|
if self.type == self.DICT:
|
|
return iter(zip(self.keys, self.values))
|
|
else:
|
|
return iter(self.values)
|
|
|
|
def __repr__(self):
|
|
if self.type == self.NOARRAY:
|
|
type = 'noarray'
|
|
else:
|
|
type = self.type
|
|
return "<%s: %s%s>" % (self.__class__.__name__, type, self.values)
|
|
|
|
|
|
class NamePart(str):
|
|
"""
|
|
A string. Sometimes it is important to know if the string belongs to a name
|
|
or not.
|
|
"""
|
|
pass
|
|
|
|
|
|
class Name(Simple):
|
|
"""
|
|
Used to define names in python.
|
|
Which means the whole namespace/class/function stuff.
|
|
So a name like "module.class.function"
|
|
would result in an array of [module, class, function]
|
|
"""
|
|
def __init__(self, names, start_pos, end_pos):
|
|
super(Name, self).__init__(start_pos, end_pos)
|
|
self.names = tuple(NamePart(n) for n in names)
|
|
|
|
def get_code(self):
|
|
""" Returns the names in a full string format """
|
|
return ".".join(self.names)
|
|
|
|
def __str__(self):
|
|
return self.get_code()
|
|
|
|
def __eq__(self, other):
|
|
return self.names == other.names and self.start_pos == other.end_pos
|
|
|
|
def __ne__(self, other):
|
|
return not self.__eq__(other)
|
|
|
|
def __hash__(self):
|
|
return hash(self.names) + hash(self.start_pos[0]) \
|
|
+ hash(self.start_pos[1])
|
|
|
|
def __len__(self):
|
|
return len(self.names)
|
|
|
|
|
|
class PyFuzzyParser(object):
|
|
"""
|
|
This class is used to parse a Python file, it then divides them into a
|
|
class structure of different scopes.
|
|
|
|
:param code: The codebase for the parser.
|
|
:type code: str
|
|
:param user_position: The line/column, the user is currently on.
|
|
:type user_position: tuple(int, int)
|
|
"""
|
|
def __init__(self, code, module_path=None, user_position=None):
|
|
self.user_position = user_position
|
|
self.user_stmt = None
|
|
self.code = code + '\n' # end with \n, because the parser needs it
|
|
if is_py3k():
|
|
self.code = self.code.encode()
|
|
|
|
# initialize global Scope
|
|
self.top = Module(module_path)
|
|
self.scope = self.top
|
|
self.current = (None, None, None)
|
|
|
|
# Stuff to fix tokenize errors. The parser is pretty good in tolerating
|
|
# any errors of tokenize and just parse ahead.
|
|
self._tokenize_start_pos = 0
|
|
self._line_of_tokenize_restart = 0
|
|
|
|
self.parse()
|
|
|
|
# delete code again, only the parser needs it
|
|
del self.code
|
|
|
|
def __repr__(self):
|
|
return "<%s: %s>" % (self.__class__.__name__, self.top)
|
|
|
|
@property
|
|
def start_pos(self):
|
|
return (self._line_of_tokenize_restart + self._tokenize_start_pos[0],
|
|
self._tokenize_start_pos[1])
|
|
|
|
@property
|
|
def end_pos(self):
|
|
return (self._line_of_tokenize_restart + self._tokenize_end_pos[0],
|
|
self._tokenize_end_pos[1])
|
|
|
|
def check_user_stmt(self, simple):
|
|
if not self.user_position:
|
|
return
|
|
# the position is right
|
|
if simple.start_pos < self.user_position <= simple.end_pos:
|
|
if self.user_stmt is not None:
|
|
# if there is already a user position (another import, because
|
|
# imports are splitted) the names are checked.
|
|
for n in simple.get_defined_names():
|
|
if n.start_pos < self.user_position <= n.end_pos:
|
|
self.user_stmt = simple
|
|
else:
|
|
self.user_stmt = simple
|
|
|
|
|
|
def _parsedotname(self, pre_used_token=None):
|
|
"""
|
|
The dot name parser parses a name, variable or function and returns
|
|
their names.
|
|
|
|
:return: Tuple of Name, token_type, nexttoken.
|
|
:rtype: tuple(Name, int, str)
|
|
"""
|
|
names = []
|
|
if pre_used_token is None:
|
|
token_type, tok = self.next()
|
|
if token_type != tokenize.NAME and tok != '*':
|
|
return ([], token_type, tok, self.start_pos)
|
|
else:
|
|
token_type, tok = pre_used_token
|
|
|
|
names.append(tok)
|
|
first_pos = self.start_pos
|
|
while True:
|
|
token_type, tok = self.next()
|
|
if tok != '.':
|
|
break
|
|
token_type, tok = self.next()
|
|
if token_type != tokenize.NAME:
|
|
break
|
|
names.append(tok)
|
|
|
|
n = Name(names, first_pos, self.end_pos) if names else None
|
|
return (n, token_type, tok)
|
|
|
|
def _parseimportlist(self):
|
|
"""
|
|
The parser for the imports. Unlike the class and function parse
|
|
function, this returns no Import class, but rather an import list,
|
|
which is then added later on.
|
|
The reason, why this is not done in the same class lies in the nature
|
|
of imports. There are two ways to write them:
|
|
|
|
- from ... import ...
|
|
- import ...
|
|
|
|
To distinguish, this has to be processed after the parser.
|
|
|
|
:return: List of imports.
|
|
:rtype: list
|
|
"""
|
|
imports = []
|
|
brackets = False
|
|
continue_kw = [",", ";", "\n", ')'] \
|
|
+ list(set(keyword.kwlist) - set(['as']))
|
|
while True:
|
|
defunct = False
|
|
token_type, tok = self.next()
|
|
if brackets and tok == '\n':
|
|
self.next()
|
|
if tok == '(': # python allows only one `(` in the statement.
|
|
brackets = True
|
|
self.next()
|
|
i, token_type, tok = self._parsedotname(self.current)
|
|
if not i:
|
|
defunct = True
|
|
name2 = None
|
|
if tok == 'as':
|
|
name2, token_type, tok = self._parsedotname()
|
|
imports.append((i, name2, defunct))
|
|
while tok not in continue_kw:
|
|
token_type, tok = self.next()
|
|
if not (tok == "," or brackets and tok == '\n'):
|
|
break
|
|
return imports
|
|
|
|
def _parseparen(self):
|
|
"""
|
|
Functions and Classes have params (which means for classes
|
|
super-classes). They are parsed here and returned as Statements.
|
|
|
|
:return: List of Statements
|
|
:rtype: list
|
|
"""
|
|
names = []
|
|
tok = None
|
|
pos = 0
|
|
while tok not in [')', ':']:
|
|
stmt, tok = self._parse_statement(added_breaks=',',
|
|
stmt_class=Param)
|
|
if stmt:
|
|
stmt.position = pos
|
|
names.append(stmt)
|
|
pos += 1
|
|
|
|
return names
|
|
|
|
def _parsefunction(self):
|
|
"""
|
|
The parser for a text functions. Process the tokens, which follow a
|
|
function definition.
|
|
|
|
:return: Return a Scope representation of the tokens.
|
|
:rtype: Function
|
|
"""
|
|
first_pos = self.start_pos
|
|
token_type, fname = self.next()
|
|
if token_type != tokenize.NAME:
|
|
return None
|
|
|
|
fname = Name([fname], self.start_pos, self.end_pos)
|
|
|
|
token_type, open = self.next()
|
|
if open != '(':
|
|
return None
|
|
params = self._parseparen()
|
|
|
|
token_type, colon = self.next()
|
|
if colon != ':':
|
|
return None
|
|
|
|
return Function(fname, params, first_pos)
|
|
|
|
def _parseclass(self):
|
|
"""
|
|
The parser for a text class. Process the tokens, which follow a
|
|
class definition.
|
|
|
|
:return: Return a Scope representation of the tokens.
|
|
:rtype: Class
|
|
"""
|
|
first_pos = self.start_pos
|
|
token_type, cname = self.next()
|
|
if token_type != tokenize.NAME:
|
|
debug.dbg("class: syntax error - token is not a name@%s (%s: %s)"
|
|
% (self.start_pos[0], tokenize.tok_name[token_type], cname))
|
|
return None
|
|
|
|
cname = Name([cname], self.start_pos, self.end_pos)
|
|
|
|
super = []
|
|
token_type, next = self.next()
|
|
if next == '(':
|
|
super = self._parseparen()
|
|
token_type, next = self.next()
|
|
|
|
if next != ':':
|
|
debug.dbg("class syntax: %s@%s" % (cname, self.start_pos[0]))
|
|
return None
|
|
|
|
return Class(cname, super, first_pos)
|
|
|
|
def _parse_statement(self, pre_used_token=None, added_breaks=None,
|
|
stmt_class=Statement):
|
|
"""
|
|
Parses statements like:
|
|
|
|
>>> a = test(b)
|
|
>>> a += 3 - 2 or b
|
|
|
|
and so on. One line at a time.
|
|
|
|
:param pre_used_token: The pre parsed token.
|
|
:type pre_used_token: set
|
|
:return: Statement + last parsed token.
|
|
:rtype: (Statement, str)
|
|
|
|
TODO improve abort criterion of not closing parentheses
|
|
"""
|
|
|
|
string = ''
|
|
set_vars = []
|
|
used_funcs = []
|
|
used_vars = []
|
|
level = 0 # The level of parentheses
|
|
is_return = None
|
|
|
|
if pre_used_token:
|
|
token_type, tok = pre_used_token
|
|
else:
|
|
token_type, tok = self.next()
|
|
|
|
first_pos = self.start_pos
|
|
|
|
# the difference between "break" and "always break" is that the latter
|
|
# will even break in parentheses. This is true for typical flow
|
|
# commands like def and class and the imports, which will never be used
|
|
# in a statement.
|
|
breaks = ['\n', ':', ')']
|
|
always_break = [';', 'import', 'from', 'class', 'def', 'try', 'except',
|
|
'finally', 'while']
|
|
if added_breaks:
|
|
breaks += added_breaks
|
|
|
|
tok_list = []
|
|
while not (tok in always_break or tok in breaks and level <= 0):
|
|
set_string = None
|
|
#print 'parse_stmt', tok, tokenize.tok_name[token_type]
|
|
tok_list.append(self.current)
|
|
if tok == 'as':
|
|
string += " %s " % tok
|
|
token_type, tok = self.next()
|
|
if token_type == tokenize.NAME:
|
|
n, token_type, tok = self._parsedotname(self.current)
|
|
if n:
|
|
set_vars.append(n)
|
|
tok_list.append(n)
|
|
string += ".".join(n.names)
|
|
continue
|
|
elif token_type == tokenize.NAME:
|
|
#print 'is_name', tok
|
|
if tok in ['return', 'yield', 'del', 'raise', 'assert']:
|
|
if len(tok_list) > 1:
|
|
# this happens, when a statement has opening brackets,
|
|
# which are not closed again, here I just start a new
|
|
# statement. This is a hack, but I could not come up
|
|
# with a better solution.
|
|
# This is basically a reset of the statement.
|
|
debug.warning('keyword in statement %s@%s', tok_list,
|
|
self.start_pos[0])
|
|
tok_list = [self.current]
|
|
set_vars = []
|
|
used_funcs = []
|
|
used_vars = []
|
|
level = 0
|
|
set_string = tok + ' '
|
|
if tok in ['return', 'yield']:
|
|
is_return = tok
|
|
elif tok in ['print', 'exec']:
|
|
# TODO they should be reinstated, since the goal of the
|
|
# parser is a different one.
|
|
# delete those statements, just let the rest stand there
|
|
set_string = ''
|
|
else:
|
|
n, token_type, tok = self._parsedotname(self.current)
|
|
tok_list.pop() # removed last entry, because we add Name
|
|
tok_list.append(n)
|
|
if tok == '(':
|
|
# it must be a function
|
|
used_funcs.append(n)
|
|
else:
|
|
used_vars.append(n)
|
|
if string and re.match(r'[\w\d\'"]', string[-1]):
|
|
string += ' '
|
|
string += ".".join(n.names)
|
|
#print 'parse_stmt', tok, tokenize.tok_name[token_type]
|
|
continue
|
|
elif '=' in tok and not tok in ['>=', '<=', '==', '!=']:
|
|
# there has been an assignement -> change vars
|
|
if level == 0:
|
|
set_vars = used_vars
|
|
used_vars = []
|
|
elif tok in ['{', '(', '[']:
|
|
level += 1
|
|
elif tok in ['}', ')', ']']:
|
|
level -= 1
|
|
|
|
if set_string is not None:
|
|
string = set_string
|
|
else:
|
|
string += tok
|
|
token_type, tok = self.next()
|
|
if not string:
|
|
return None, tok
|
|
#print 'new_stat', string, set_vars, used_funcs, used_vars
|
|
if self.freshscope and len(tok_list) > 1 \
|
|
and self.last_token[1] == tokenize.STRING:
|
|
self.scope.add_docstr(self.last_token[1])
|
|
print('i want to see you')
|
|
else:
|
|
stmt = stmt_class(string, set_vars, used_funcs, used_vars, \
|
|
tok_list, first_pos, self.end_pos)
|
|
self.check_user_stmt(stmt)
|
|
if is_return:
|
|
# add returns to the scope
|
|
func = self.scope.get_parent_until(Function)
|
|
if is_return == 'yield':
|
|
func.is_generator = True
|
|
try:
|
|
func.returns.append(stmt)
|
|
except AttributeError:
|
|
debug.warning('return in non-function')
|
|
|
|
return stmt, tok
|
|
|
|
def next(self):
|
|
""" Generate the next tokenize pattern. """
|
|
type, tok, self._tokenize_start_pos, self._tokenize_end_pos, \
|
|
self.parserline = next(self.gen)
|
|
if self.user_position and self.start_pos[0] == self.user_position[0]:
|
|
debug.dbg('user scope found [%s] =%s' % \
|
|
(self.parserline.replace('\n', ''), repr(self.scope)))
|
|
self.user_scope = self.scope
|
|
self.last_token = self.current
|
|
self.current = (type, tok)
|
|
return self.current
|
|
|
|
def parse(self):
|
|
"""
|
|
The main part of the program. It analyzes the given code-text and
|
|
returns a tree-like scope. For a more detailed description, see the
|
|
class description.
|
|
|
|
:param text: The code which should be parsed.
|
|
:param type: str
|
|
|
|
:raises: IndentationError
|
|
"""
|
|
buf = BytesIO(self.code)
|
|
self.gen = tokenize_func(buf.readline)
|
|
self.currentscope = self.scope
|
|
|
|
extended_flow = ['else', 'elif', 'except', 'finally']
|
|
statement_toks = ['{', '[', '(', '`']
|
|
|
|
decorators = []
|
|
self.freshscope = True
|
|
while True:
|
|
try:
|
|
token_type, tok = self.next()
|
|
#debug.dbg('main: tok=[%s] type=[%s] indent=[%s]'\
|
|
# % (tok, token_type, start_position[0]))
|
|
|
|
while token_type == tokenize.DEDENT and self.scope != self.top:
|
|
debug.dbg('dedent', self.scope)
|
|
token_type, tok = self.next()
|
|
if self.start_pos[1] <= self.scope.start_pos[1]:
|
|
self.scope.end_pos = self.start_pos
|
|
self.scope = self.scope.parent
|
|
|
|
# check again for unindented stuff. this is true for syntax
|
|
# errors. only check for names, because thats relevant here. If
|
|
# some docstrings are not indented, I don't care.
|
|
while self.start_pos[1] <= self.scope.start_pos[1] \
|
|
and (token_type == tokenize.NAME or tok in ['(', '['])\
|
|
and self.scope != self.top:
|
|
debug.dbg('syntax: dedent @%s - %s<=%s', self.start_pos)
|
|
self.scope.end_pos = self.start_pos
|
|
self.scope = self.scope.parent
|
|
|
|
first_pos = self.start_pos
|
|
if tok == 'def':
|
|
func = self._parsefunction()
|
|
if func is None:
|
|
debug.warning("function: syntax error@%s" %
|
|
self.start_pos[0])
|
|
continue
|
|
debug.dbg("new scope: function %s" % (func.name))
|
|
self.freshscope = True
|
|
self.scope = self.scope.add_scope(func, decorators)
|
|
decorators = []
|
|
elif tok == 'class':
|
|
cls = self._parseclass()
|
|
if cls is None:
|
|
debug.warning("class: syntax error@%s" %
|
|
self.start_pos[0])
|
|
continue
|
|
self.freshscope = True
|
|
debug.dbg("new scope: class %s" % (cls.name))
|
|
self.scope = self.scope.add_scope(cls, decorators)
|
|
decorators = []
|
|
# import stuff
|
|
elif tok == 'import':
|
|
imports = self._parseimportlist()
|
|
for m, alias, defunct in imports:
|
|
i = Import(first_pos, self.end_pos, m, alias,
|
|
defunct=defunct)
|
|
self.check_user_stmt(i)
|
|
self.scope.add_import(i)
|
|
debug.dbg("new import: %s" % (i), self.current)
|
|
if not imports:
|
|
i = Import(first_pos, self.end_pos, None, defunct=True)
|
|
self.check_user_stmt(i)
|
|
self.freshscope = False
|
|
elif tok == 'from':
|
|
defunct = False
|
|
# take care for relative imports
|
|
relative_count = 0
|
|
while 1:
|
|
token_type, tok = self.next()
|
|
if tok != '.':
|
|
break
|
|
relative_count += 1
|
|
# the from import
|
|
mod, token_type, tok = self._parsedotname(self.current)
|
|
if not mod or tok != "import":
|
|
debug.warning("from: syntax error@%s" %
|
|
self.start_pos[0])
|
|
defunct = True
|
|
names = self._parseimportlist()
|
|
for name, alias, defunct2 in names:
|
|
star = name.names[0] == '*'
|
|
if star:
|
|
name = None
|
|
i = Import(first_pos, self.end_pos, name, alias, mod,
|
|
star, relative_count, defunct=defunct or defunct2)
|
|
self.check_user_stmt(i)
|
|
self.scope.add_import(i)
|
|
debug.dbg("new from: %s" % (i))
|
|
if not names:
|
|
i = Import(first_pos, self.end_pos, mod, defunct=True,
|
|
relative_count=relative_count)
|
|
self.check_user_stmt(i)
|
|
self.freshscope = False
|
|
#loops
|
|
elif tok == 'for':
|
|
set_stmt, tok = self._parse_statement(added_breaks=['in'])
|
|
if tok == 'in':
|
|
statement, tok = self._parse_statement()
|
|
if tok == ':':
|
|
f = ForFlow('for', [statement], first_pos,
|
|
set_stmt)
|
|
debug.dbg("new scope: forflow@%s" % f.start_pos[0])
|
|
self.scope = self.scope.add_statement(f)
|
|
|
|
elif tok in ['if', 'while', 'try', 'with'] + extended_flow:
|
|
added_breaks = []
|
|
command = tok
|
|
if command in ['except', 'with']:
|
|
added_breaks.append(',')
|
|
# multiple statements because of with
|
|
inits = []
|
|
first = True
|
|
while first or command == 'with' and tok != ':':
|
|
statement, tok = \
|
|
self._parse_statement(added_breaks=added_breaks)
|
|
if command == 'except' and tok in added_breaks:
|
|
# the except statement defines a var
|
|
# this is only true for python 2
|
|
n, token_type, tok = self._parsedotname()
|
|
if n:
|
|
statement.set_vars.append(n)
|
|
statement.code += ',' + n.get_code()
|
|
if statement:
|
|
inits.append(statement)
|
|
first = False
|
|
|
|
if tok == ':':
|
|
f = Flow(command, inits, first_pos)
|
|
debug.dbg("new scope: flow %s@%s"
|
|
% (command, self.start_pos[0]))
|
|
if command in extended_flow:
|
|
# the last statement has to be another part of
|
|
# the flow statement, because a dedent releases the
|
|
# main scope, so just take the last statement.
|
|
try:
|
|
s = self.scope.statements[-1].set_next(f)
|
|
except (AttributeError, IndexError):
|
|
# If set_next doesn't exist, just add it.
|
|
s = self.scope.add_statement(f)
|
|
else:
|
|
s = self.scope.add_statement(f)
|
|
self.scope = s
|
|
else:
|
|
debug.warning('syntax err, flow started @%s',
|
|
self.start_pos[0])
|
|
# globals
|
|
elif tok == 'global':
|
|
stmt, tok = self._parse_statement(self.current)
|
|
if stmt:
|
|
self.scope.add_statement(stmt)
|
|
debug.dbg('global_vars', stmt.used_vars)
|
|
for name in stmt.used_vars:
|
|
# add the global to the top, because there it is
|
|
# important.
|
|
self.top.add_global(name)
|
|
# decorator
|
|
elif tok == '@':
|
|
stmt, tok = self._parse_statement()
|
|
decorators.append(stmt)
|
|
elif tok == 'pass':
|
|
continue
|
|
# default
|
|
elif token_type in [tokenize.NAME, tokenize.STRING,
|
|
tokenize.NUMBER] \
|
|
or tok in statement_toks:
|
|
# this is the main part - a name can be a function or a
|
|
# normal var, which can follow anything. but this is done
|
|
# by the statement parser.
|
|
stmt, tok = self._parse_statement(self.current)
|
|
if stmt:
|
|
debug.dbg('new stmt', stmt)
|
|
self.scope.add_statement(stmt)
|
|
self.freshscope = False
|
|
else:
|
|
if token_type not in [tokenize.COMMENT, tokenize.INDENT,
|
|
tokenize.NEWLINE, tokenize.NL,
|
|
tokenize.ENDMARKER]:
|
|
debug.warning('token not classified', tok, token_type,
|
|
self.start_pos[0])
|
|
except StopIteration: # thrown on EOF
|
|
break
|
|
except tokenize.TokenError:
|
|
# We just ignore this error, I try to handle it earlier - as
|
|
# good as possible
|
|
debug.warning('parentheses not closed error')
|
|
except IndentationError:
|
|
# This is an error, that tokenize may produce, because the code
|
|
# is not indented as it should. Here it just ignores this line
|
|
# and restarts the parser.
|
|
# (This is a rather unlikely error message, for normal code,
|
|
# tokenize seems to be pretty tolerant)
|
|
self._line_of_tokenize_restart = self.start_pos[0] + 1
|
|
self._tokenize_start_pos = (0,0)
|
|
self._tokenize_end_pos = (0,0)
|
|
debug.warning('indentation error on line %s, ignoring it' %
|
|
(self.start_pos[0]))
|
|
self.gen = tokenize.generate_tokens(buf.readline)
|
|
return self.top
|