mirror of https://github.com/python/cpython
1349 lines
43 KiB
Python
1349 lines
43 KiB
Python
"""Parse tree transformation module.
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Transforms Python source code into an abstract syntax tree (AST)
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defined in the ast module.
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The simplest ways to invoke this module are via parse and parseFile.
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parse(buf) -> AST
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parseFile(path) -> AST
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"""
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# Original version written by Greg Stein (gstein@lyra.org)
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# and Bill Tutt (rassilon@lima.mudlib.org)
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# February 1997.
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#
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# Modifications and improvements for Python 2.0 by Jeremy Hylton and
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# Mark Hammond
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# Portions of this file are:
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# Copyright (C) 1997-1998 Greg Stein. All Rights Reserved.
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#
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# This module is provided under a BSD-ish license. See
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# http://www.opensource.org/licenses/bsd-license.html
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# and replace OWNER, ORGANIZATION, and YEAR as appropriate.
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from ast import *
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import parser
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# Care must be taken to use only symbols and tokens defined in Python
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# 1.5.2 for code branches executed in 1.5.2
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import symbol
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import token
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import string
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import sys
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error = 'walker.error'
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from consts import CO_VARARGS, CO_VARKEYWORDS
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from consts import OP_ASSIGN, OP_DELETE, OP_APPLY
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def parseFile(path):
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f = open(path)
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src = f.read()
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f.close()
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return parse(src)
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def parse(buf):
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return Transformer().parsesuite(buf)
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def asList(nodes):
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l = []
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for item in nodes:
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if hasattr(item, "asList"):
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l.append(item.asList())
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else:
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if type(item) is type( (None, None) ):
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l.append(tuple(asList(item)))
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elif type(item) is type( [] ):
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l.append(asList(item))
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else:
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l.append(item)
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return l
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def Node(*args):
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kind = args[0]
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if nodes.has_key(kind):
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try:
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return apply(nodes[kind], args[1:])
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except TypeError:
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print nodes[kind], len(args), args
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raise
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else:
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raise error, "Can't find appropriate Node type: %s" % str(args)
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#return apply(ast.Node, args)
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class Transformer:
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"""Utility object for transforming Python parse trees.
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Exposes the following methods:
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tree = transform(ast_tree)
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tree = parsesuite(text)
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tree = parseexpr(text)
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tree = parsefile(fileob | filename)
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"""
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def __init__(self):
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self._dispatch = {}
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for value, name in symbol.sym_name.items():
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if hasattr(self, name):
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self._dispatch[value] = getattr(self, name)
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self._dispatch[token.NEWLINE] = self.com_NEWLINE
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self._atom_dispatch = {token.LPAR: self.atom_lpar,
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token.LSQB: self.atom_lsqb,
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token.LBRACE: self.atom_lbrace,
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token.BACKQUOTE: self.atom_backquote,
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token.NUMBER: self.atom_number,
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token.STRING: self.atom_string,
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token.NAME: self.atom_name,
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}
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def transform(self, tree):
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"""Transform an AST into a modified parse tree."""
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if type(tree) != type(()) and type(tree) != type([]):
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tree = parser.ast2tuple(tree, line_info=1)
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return self.compile_node(tree)
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def parsesuite(self, text):
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"""Return a modified parse tree for the given suite text."""
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# Hack for handling non-native line endings on non-DOS like OSs.
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text = string.replace(text, '\x0d', '')
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return self.transform(parser.suite(text))
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def parseexpr(self, text):
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"""Return a modified parse tree for the given expression text."""
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return self.transform(parser.expr(text))
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def parsefile(self, file):
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"""Return a modified parse tree for the contents of the given file."""
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if type(file) == type(''):
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file = open(file)
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return self.parsesuite(file.read())
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# --------------------------------------------------------------
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#
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# PRIVATE METHODS
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#
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def compile_node(self, node):
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### emit a line-number node?
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n = node[0]
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if n == symbol.single_input:
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return self.single_input(node[1:])
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if n == symbol.file_input:
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return self.file_input(node[1:])
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if n == symbol.eval_input:
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return self.eval_input(node[1:])
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if n == symbol.lambdef:
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return self.lambdef(node[1:])
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if n == symbol.funcdef:
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return self.funcdef(node[1:])
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if n == symbol.classdef:
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return self.classdef(node[1:])
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raise error, ('unexpected node type', n)
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def single_input(self, node):
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### do we want to do anything about being "interactive" ?
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# NEWLINE | simple_stmt | compound_stmt NEWLINE
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n = node[0][0]
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if n != token.NEWLINE:
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return self.com_stmt(node[0])
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return Pass()
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def file_input(self, nodelist):
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doc = self.get_docstring(nodelist, symbol.file_input)
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if doc is not None:
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i = 1
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else:
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i = 0
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stmts = []
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for node in nodelist[i:]:
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if node[0] != token.ENDMARKER and node[0] != token.NEWLINE:
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self.com_append_stmt(stmts, node)
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return Module(doc, Stmt(stmts))
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def eval_input(self, nodelist):
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# from the built-in function input()
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### is this sufficient?
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return self.com_node(nodelist[0])
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def funcdef(self, nodelist):
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# funcdef: 'def' NAME parameters ':' suite
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# parameters: '(' [varargslist] ')'
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lineno = nodelist[1][2]
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name = nodelist[1][1]
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args = nodelist[2][2]
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if args[0] == symbol.varargslist:
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names, defaults, flags = self.com_arglist(args[1:])
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else:
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names = defaults = ()
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flags = 0
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doc = self.get_docstring(nodelist[4])
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# code for function
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code = self.com_node(nodelist[4])
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if doc is not None:
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assert isinstance(code, Stmt)
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assert isinstance(code.nodes[0], Discard)
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del code.nodes[0]
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n = Function(name, names, defaults, flags, doc, code)
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n.lineno = lineno
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return n
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def lambdef(self, nodelist):
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# lambdef: 'lambda' [varargslist] ':' test
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if nodelist[2][0] == symbol.varargslist:
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names, defaults, flags = self.com_arglist(nodelist[2][1:])
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else:
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names = defaults = ()
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flags = 0
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# code for lambda
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code = self.com_node(nodelist[-1])
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n = Lambda(names, defaults, flags, code)
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n.lineno = nodelist[1][2]
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return n
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def classdef(self, nodelist):
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# classdef: 'class' NAME ['(' testlist ')'] ':' suite
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name = nodelist[1][1]
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doc = self.get_docstring(nodelist[-1])
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if nodelist[2][0] == token.COLON:
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bases = []
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else:
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bases = self.com_bases(nodelist[3])
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# code for class
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code = self.com_node(nodelist[-1])
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if doc is not None:
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assert isinstance(code, Stmt)
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assert isinstance(code.nodes[0], Discard)
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del code.nodes[0]
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n = Class(name, bases, doc, code)
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n.lineno = nodelist[1][2]
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return n
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def stmt(self, nodelist):
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return self.com_stmt(nodelist[0])
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small_stmt = stmt
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flow_stmt = stmt
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compound_stmt = stmt
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def simple_stmt(self, nodelist):
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# small_stmt (';' small_stmt)* [';'] NEWLINE
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stmts = []
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for i in range(0, len(nodelist), 2):
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self.com_append_stmt(stmts, nodelist[i])
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return Stmt(stmts)
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def parameters(self, nodelist):
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raise error
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def varargslist(self, nodelist):
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raise error
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def fpdef(self, nodelist):
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raise error
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def fplist(self, nodelist):
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raise error
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def dotted_name(self, nodelist):
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raise error
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def comp_op(self, nodelist):
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raise error
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def trailer(self, nodelist):
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raise error
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def sliceop(self, nodelist):
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raise error
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def argument(self, nodelist):
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raise error
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# --------------------------------------------------------------
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#
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# STATEMENT NODES (invoked by com_node())
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#
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def expr_stmt(self, nodelist):
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# augassign testlist | testlist ('=' testlist)*
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en = nodelist[-1]
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exprNode = self.lookup_node(en)(en[1:])
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if len(nodelist) == 1:
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n = Discard(exprNode)
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n.lineno = exprNode.lineno
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return n
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if nodelist[1][0] == token.EQUAL:
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nodes = []
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for i in range(0, len(nodelist) - 2, 2):
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nodes.append(self.com_assign(nodelist[i], OP_ASSIGN))
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n = Assign(nodes, exprNode)
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n.lineno = nodelist[1][2]
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else:
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lval = self.com_augassign(nodelist[0])
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op = self.com_augassign_op(nodelist[1])
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n = AugAssign(lval, op[1], exprNode)
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n.lineno = op[2]
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return n
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def print_stmt(self, nodelist):
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# print ([ test (',' test)* [','] ] | '>>' test [ (',' test)+ [','] ])
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items = []
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if len(nodelist) == 1:
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start = 1
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dest = None
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elif nodelist[1][0] == token.RIGHTSHIFT:
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assert len(nodelist) == 3 \
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or nodelist[3][0] == token.COMMA
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dest = self.com_node(nodelist[2])
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start = 4
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else:
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dest = None
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start = 1
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for i in range(start, len(nodelist), 2):
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items.append(self.com_node(nodelist[i]))
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if nodelist[-1][0] == token.COMMA:
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n = Print(items, dest)
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n.lineno = nodelist[0][2]
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return n
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n = Printnl(items, dest)
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n.lineno = nodelist[0][2]
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return n
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def del_stmt(self, nodelist):
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return self.com_assign(nodelist[1], OP_DELETE)
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def pass_stmt(self, nodelist):
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n = Pass()
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n.lineno = nodelist[0][2]
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return n
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def break_stmt(self, nodelist):
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n = Break()
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n.lineno = nodelist[0][2]
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return n
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def continue_stmt(self, nodelist):
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n = Continue()
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n.lineno = nodelist[0][2]
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return n
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def return_stmt(self, nodelist):
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# return: [testlist]
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if len(nodelist) < 2:
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n = Return(Const(None))
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n.lineno = nodelist[0][2]
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return n
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n = Return(self.com_node(nodelist[1]))
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n.lineno = nodelist[0][2]
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return n
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def yield_stmt(self, nodelist):
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n = Yield(self.com_node(nodelist[1]))
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n.lineno = nodelist[0][2]
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return n
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def raise_stmt(self, nodelist):
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# raise: [test [',' test [',' test]]]
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if len(nodelist) > 5:
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expr3 = self.com_node(nodelist[5])
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else:
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expr3 = None
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if len(nodelist) > 3:
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expr2 = self.com_node(nodelist[3])
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else:
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expr2 = None
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if len(nodelist) > 1:
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expr1 = self.com_node(nodelist[1])
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else:
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expr1 = None
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n = Raise(expr1, expr2, expr3)
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n.lineno = nodelist[0][2]
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return n
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def import_stmt(self, nodelist):
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# import_stmt: 'import' dotted_as_name (',' dotted_as_name)* |
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# from: 'from' dotted_name 'import'
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# ('*' | import_as_name (',' import_as_name)*)
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if nodelist[0][1] == 'from':
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names = []
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if nodelist[3][0] == token.NAME:
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for i in range(3, len(nodelist), 2):
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names.append((nodelist[i][1], None))
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else:
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for i in range(3, len(nodelist), 2):
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names.append(self.com_import_as_name(nodelist[i]))
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n = From(self.com_dotted_name(nodelist[1]), names)
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n.lineno = nodelist[0][2]
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return n
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if nodelist[1][0] == symbol.dotted_name:
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names = [(self.com_dotted_name(nodelist[1][1:]), None)]
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else:
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names = []
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for i in range(1, len(nodelist), 2):
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names.append(self.com_dotted_as_name(nodelist[i]))
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n = Import(names)
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n.lineno = nodelist[0][2]
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return n
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def global_stmt(self, nodelist):
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# global: NAME (',' NAME)*
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names = []
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for i in range(1, len(nodelist), 2):
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names.append(nodelist[i][1])
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n = Global(names)
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n.lineno = nodelist[0][2]
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return n
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def exec_stmt(self, nodelist):
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# exec_stmt: 'exec' expr ['in' expr [',' expr]]
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expr1 = self.com_node(nodelist[1])
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if len(nodelist) >= 4:
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expr2 = self.com_node(nodelist[3])
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if len(nodelist) >= 6:
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expr3 = self.com_node(nodelist[5])
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else:
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expr3 = None
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else:
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expr2 = expr3 = None
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n = Exec(expr1, expr2, expr3)
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n.lineno = nodelist[0][2]
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return n
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def assert_stmt(self, nodelist):
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# 'assert': test, [',' test]
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expr1 = self.com_node(nodelist[1])
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if (len(nodelist) == 4):
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expr2 = self.com_node(nodelist[3])
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else:
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expr2 = None
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n = Assert(expr1, expr2)
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n.lineno = nodelist[0][2]
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return n
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def if_stmt(self, nodelist):
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# if: test ':' suite ('elif' test ':' suite)* ['else' ':' suite]
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tests = []
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for i in range(0, len(nodelist) - 3, 4):
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testNode = self.com_node(nodelist[i + 1])
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suiteNode = self.com_node(nodelist[i + 3])
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tests.append((testNode, suiteNode))
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if len(nodelist) % 4 == 3:
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elseNode = self.com_node(nodelist[-1])
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## elseNode.lineno = nodelist[-1][1][2]
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else:
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elseNode = None
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n = If(tests, elseNode)
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n.lineno = nodelist[0][2]
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return n
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def while_stmt(self, nodelist):
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# 'while' test ':' suite ['else' ':' suite]
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testNode = self.com_node(nodelist[1])
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bodyNode = self.com_node(nodelist[3])
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if len(nodelist) > 4:
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elseNode = self.com_node(nodelist[6])
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else:
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elseNode = None
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n = While(testNode, bodyNode, elseNode)
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n.lineno = nodelist[0][2]
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return n
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def for_stmt(self, nodelist):
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# 'for' exprlist 'in' exprlist ':' suite ['else' ':' suite]
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assignNode = self.com_assign(nodelist[1], OP_ASSIGN)
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listNode = self.com_node(nodelist[3])
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bodyNode = self.com_node(nodelist[5])
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if len(nodelist) > 8:
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elseNode = self.com_node(nodelist[8])
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else:
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elseNode = None
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n = For(assignNode, listNode, bodyNode, elseNode)
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n.lineno = nodelist[0][2]
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return n
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def try_stmt(self, nodelist):
|
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# 'try' ':' suite (except_clause ':' suite)+ ['else' ':' suite]
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# | 'try' ':' suite 'finally' ':' suite
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if nodelist[3][0] != symbol.except_clause:
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return self.com_try_finally(nodelist)
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return self.com_try_except(nodelist)
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def suite(self, nodelist):
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# simple_stmt | NEWLINE INDENT NEWLINE* (stmt NEWLINE*)+ DEDENT
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if len(nodelist) == 1:
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return self.com_stmt(nodelist[0])
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stmts = []
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for node in nodelist:
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if node[0] == symbol.stmt:
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self.com_append_stmt(stmts, node)
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return Stmt(stmts)
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|
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# --------------------------------------------------------------
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#
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# EXPRESSION NODES (invoked by com_node())
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#
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def testlist(self, nodelist):
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# testlist: expr (',' expr)* [',']
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# exprlist: expr (',' expr)* [',']
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return self.com_binary(Tuple, nodelist)
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|
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exprlist = testlist
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|
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def test(self, nodelist):
|
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# and_test ('or' and_test)* | lambdef
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if len(nodelist) == 1 and nodelist[0][0] == symbol.lambdef:
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return self.lambdef(nodelist[0])
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return self.com_binary(Or, nodelist)
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def and_test(self, nodelist):
|
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# not_test ('and' not_test)*
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return self.com_binary(And, nodelist)
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|
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def not_test(self, nodelist):
|
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# 'not' not_test | comparison
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result = self.com_node(nodelist[-1])
|
|
if len(nodelist) == 2:
|
|
n = Not(result)
|
|
n.lineno = nodelist[0][2]
|
|
return n
|
|
return result
|
|
|
|
def comparison(self, nodelist):
|
|
# comparison: expr (comp_op expr)*
|
|
node = self.com_node(nodelist[0])
|
|
if len(nodelist) == 1:
|
|
return node
|
|
|
|
results = []
|
|
for i in range(2, len(nodelist), 2):
|
|
nl = nodelist[i-1]
|
|
|
|
# comp_op: '<' | '>' | '=' | '>=' | '<=' | '<>' | '!=' | '=='
|
|
# | 'in' | 'not' 'in' | 'is' | 'is' 'not'
|
|
n = nl[1]
|
|
if n[0] == token.NAME:
|
|
type = n[1]
|
|
if len(nl) == 3:
|
|
if type == 'not':
|
|
type = 'not in'
|
|
else:
|
|
type = 'is not'
|
|
else:
|
|
type = _cmp_types[n[0]]
|
|
|
|
lineno = nl[1][2]
|
|
results.append((type, self.com_node(nodelist[i])))
|
|
|
|
# we need a special "compare" node so that we can distinguish
|
|
# 3 < x < 5 from (3 < x) < 5
|
|
# the two have very different semantics and results (note that the
|
|
# latter form is always true)
|
|
|
|
n = Compare(node, results)
|
|
n.lineno = lineno
|
|
return n
|
|
|
|
def expr(self, nodelist):
|
|
# xor_expr ('|' xor_expr)*
|
|
return self.com_binary(Bitor, nodelist)
|
|
|
|
def xor_expr(self, nodelist):
|
|
# xor_expr ('^' xor_expr)*
|
|
return self.com_binary(Bitxor, nodelist)
|
|
|
|
def and_expr(self, nodelist):
|
|
# xor_expr ('&' xor_expr)*
|
|
return self.com_binary(Bitand, nodelist)
|
|
|
|
def shift_expr(self, nodelist):
|
|
# shift_expr ('<<'|'>>' shift_expr)*
|
|
node = self.com_node(nodelist[0])
|
|
for i in range(2, len(nodelist), 2):
|
|
right = self.com_node(nodelist[i])
|
|
if nodelist[i-1][0] == token.LEFTSHIFT:
|
|
node = LeftShift([node, right])
|
|
node.lineno = nodelist[1][2]
|
|
elif nodelist[i-1][0] == token.RIGHTSHIFT:
|
|
node = RightShift([node, right])
|
|
node.lineno = nodelist[1][2]
|
|
else:
|
|
raise ValueError, "unexpected token: %s" % nodelist[i-1][0]
|
|
return node
|
|
|
|
def arith_expr(self, nodelist):
|
|
node = self.com_node(nodelist[0])
|
|
for i in range(2, len(nodelist), 2):
|
|
right = self.com_node(nodelist[i])
|
|
if nodelist[i-1][0] == token.PLUS:
|
|
node = Add([node, right])
|
|
node.lineno = nodelist[1][2]
|
|
elif nodelist[i-1][0] == token.MINUS:
|
|
node = Sub([node, right])
|
|
node.lineno = nodelist[1][2]
|
|
else:
|
|
raise ValueError, "unexpected token: %s" % nodelist[i-1][0]
|
|
return node
|
|
|
|
def term(self, nodelist):
|
|
node = self.com_node(nodelist[0])
|
|
for i in range(2, len(nodelist), 2):
|
|
right = self.com_node(nodelist[i])
|
|
t = nodelist[i-1][0]
|
|
if t == token.STAR:
|
|
node = Mul([node, right])
|
|
elif t == token.SLASH:
|
|
node = Div([node, right])
|
|
elif t == token.PERCENT:
|
|
node = Mod([node, right])
|
|
elif t == token.DOUBLESLASH:
|
|
node = FloorDiv([node, right])
|
|
else:
|
|
raise ValueError, "unexpected token: %s" % t
|
|
node.lineno = nodelist[1][2]
|
|
return node
|
|
|
|
def factor(self, nodelist):
|
|
elt = nodelist[0]
|
|
t = elt[0]
|
|
node = self.com_node(nodelist[-1])
|
|
if t == token.PLUS:
|
|
node = UnaryAdd(node)
|
|
node.lineno = elt[2]
|
|
elif t == token.MINUS:
|
|
node = UnarySub(node)
|
|
node.lineno = elt[2]
|
|
elif t == token.TILDE:
|
|
node = Invert(node)
|
|
node.lineno = elt[2]
|
|
return node
|
|
|
|
def power(self, nodelist):
|
|
# power: atom trailer* ('**' factor)*
|
|
node = self.com_node(nodelist[0])
|
|
for i in range(1, len(nodelist)):
|
|
elt = nodelist[i]
|
|
if elt[0] == token.DOUBLESTAR:
|
|
n = Power([node, self.com_node(nodelist[i+1])])
|
|
n.lineno = elt[2]
|
|
return n
|
|
|
|
node = self.com_apply_trailer(node, elt)
|
|
|
|
return node
|
|
|
|
def atom(self, nodelist):
|
|
n = self._atom_dispatch[nodelist[0][0]](nodelist)
|
|
n.lineno = nodelist[0][2]
|
|
return n
|
|
|
|
def atom_lpar(self, nodelist):
|
|
if nodelist[1][0] == token.RPAR:
|
|
n = Tuple(())
|
|
n.lineno = nodelist[0][2]
|
|
return n
|
|
return self.com_node(nodelist[1])
|
|
|
|
def atom_lsqb(self, nodelist):
|
|
if nodelist[1][0] == token.RSQB:
|
|
n = List(())
|
|
n.lineno = nodelist[0][2]
|
|
return n
|
|
return self.com_list_constructor(nodelist[1])
|
|
|
|
def atom_lbrace(self, nodelist):
|
|
if nodelist[1][0] == token.RBRACE:
|
|
return Dict(())
|
|
return self.com_dictmaker(nodelist[1])
|
|
|
|
def atom_backquote(self, nodelist):
|
|
n = Backquote(self.com_node(nodelist[1]))
|
|
n.lineno = nodelist[0][2]
|
|
return n
|
|
|
|
def atom_number(self, nodelist):
|
|
### need to verify this matches compile.c
|
|
k = eval(nodelist[0][1])
|
|
n = Const(k)
|
|
n.lineno = nodelist[0][2]
|
|
return n
|
|
|
|
def atom_string(self, nodelist):
|
|
### need to verify this matches compile.c
|
|
k = ''
|
|
for node in nodelist:
|
|
k = k + eval(node[1])
|
|
n = Const(k)
|
|
n.lineno = nodelist[0][2]
|
|
return n
|
|
|
|
def atom_name(self, nodelist):
|
|
### any processing to do?
|
|
n = Name(nodelist[0][1])
|
|
n.lineno = nodelist[0][2]
|
|
return n
|
|
|
|
# --------------------------------------------------------------
|
|
#
|
|
# INTERNAL PARSING UTILITIES
|
|
#
|
|
|
|
# The use of com_node() introduces a lot of extra stack frames,
|
|
# enough to cause a stack overflow compiling test.test_parser with
|
|
# the standard interpreter recursionlimit. The com_node() is a
|
|
# convenience function that hides the dispatch details, but comes
|
|
# at a very high cost. It is more efficient to dispatch directly
|
|
# in the callers. In these cases, use lookup_node() and call the
|
|
# dispatched node directly.
|
|
|
|
def lookup_node(self, node):
|
|
return self._dispatch[node[0]]
|
|
|
|
def com_node(self, node):
|
|
# Note: compile.c has handling in com_node for del_stmt, pass_stmt,
|
|
# break_stmt, stmt, small_stmt, flow_stmt, simple_stmt,
|
|
# and compound_stmt.
|
|
# We'll just dispatch them.
|
|
return self._dispatch[node[0]](node[1:])
|
|
|
|
def com_NEWLINE(self, *args):
|
|
# A ';' at the end of a line can make a NEWLINE token appear
|
|
# here, Render it harmless. (genc discards ('discard',
|
|
# ('const', xxxx)) Nodes)
|
|
return Discard(Const(None))
|
|
|
|
def com_arglist(self, nodelist):
|
|
# varargslist:
|
|
# (fpdef ['=' test] ',')* ('*' NAME [',' ('**'|'*' '*') NAME]
|
|
# | fpdef ['=' test] (',' fpdef ['=' test])* [',']
|
|
# | ('**'|'*' '*') NAME)
|
|
# fpdef: NAME | '(' fplist ')'
|
|
# fplist: fpdef (',' fpdef)* [',']
|
|
names = []
|
|
defaults = []
|
|
flags = 0
|
|
|
|
i = 0
|
|
while i < len(nodelist):
|
|
node = nodelist[i]
|
|
if node[0] == token.STAR or node[0] == token.DOUBLESTAR:
|
|
if node[0] == token.STAR:
|
|
node = nodelist[i+1]
|
|
if node[0] == token.NAME:
|
|
names.append(node[1])
|
|
flags = flags | CO_VARARGS
|
|
i = i + 3
|
|
|
|
if i < len(nodelist):
|
|
# should be DOUBLESTAR or STAR STAR
|
|
t = nodelist[i][0]
|
|
if t == token.DOUBLESTAR:
|
|
node = nodelist[i+1]
|
|
elif t == token.STARSTAR:
|
|
node = nodelist[i+2]
|
|
else:
|
|
raise ValueError, "unexpected token: %s" % t
|
|
names.append(node[1])
|
|
flags = flags | CO_VARKEYWORDS
|
|
|
|
break
|
|
|
|
# fpdef: NAME | '(' fplist ')'
|
|
names.append(self.com_fpdef(node))
|
|
|
|
i = i + 1
|
|
if i >= len(nodelist):
|
|
break
|
|
|
|
if nodelist[i][0] == token.EQUAL:
|
|
defaults.append(self.com_node(nodelist[i + 1]))
|
|
i = i + 2
|
|
elif len(defaults):
|
|
# Treat "(a=1, b)" as "(a=1, b=None)"
|
|
defaults.append(Const(None))
|
|
|
|
i = i + 1
|
|
|
|
return names, defaults, flags
|
|
|
|
def com_fpdef(self, node):
|
|
# fpdef: NAME | '(' fplist ')'
|
|
if node[1][0] == token.LPAR:
|
|
return self.com_fplist(node[2])
|
|
return node[1][1]
|
|
|
|
def com_fplist(self, node):
|
|
# fplist: fpdef (',' fpdef)* [',']
|
|
if len(node) == 2:
|
|
return self.com_fpdef(node[1])
|
|
list = []
|
|
for i in range(1, len(node), 2):
|
|
list.append(self.com_fpdef(node[i]))
|
|
return tuple(list)
|
|
|
|
def com_dotted_name(self, node):
|
|
# String together the dotted names and return the string
|
|
name = ""
|
|
for n in node:
|
|
if type(n) == type(()) and n[0] == 1:
|
|
name = name + n[1] + '.'
|
|
return name[:-1]
|
|
|
|
def com_dotted_as_name(self, node):
|
|
dot = self.com_dotted_name(node[1])
|
|
if len(node) <= 2:
|
|
return dot, None
|
|
if node[0] == symbol.dotted_name:
|
|
pass
|
|
else:
|
|
assert node[2][1] == 'as'
|
|
assert node[3][0] == token.NAME
|
|
return dot, node[3][1]
|
|
|
|
def com_import_as_name(self, node):
|
|
if node[0] == token.STAR:
|
|
return '*', None
|
|
assert node[0] == symbol.import_as_name
|
|
node = node[1:]
|
|
if len(node) == 1:
|
|
assert node[0][0] == token.NAME
|
|
return node[0][1], None
|
|
|
|
assert node[1][1] == 'as', node
|
|
assert node[2][0] == token.NAME
|
|
return node[0][1], node[2][1]
|
|
|
|
def com_bases(self, node):
|
|
bases = []
|
|
for i in range(1, len(node), 2):
|
|
bases.append(self.com_node(node[i]))
|
|
return bases
|
|
|
|
def com_try_finally(self, nodelist):
|
|
# try_fin_stmt: "try" ":" suite "finally" ":" suite
|
|
n = TryFinally(self.com_node(nodelist[2]),
|
|
self.com_node(nodelist[5]))
|
|
n.lineno = nodelist[0][2]
|
|
return n
|
|
|
|
def com_try_except(self, nodelist):
|
|
# try_except: 'try' ':' suite (except_clause ':' suite)* ['else' suite]
|
|
#tryexcept: [TryNode, [except_clauses], elseNode)]
|
|
stmt = self.com_node(nodelist[2])
|
|
clauses = []
|
|
elseNode = None
|
|
for i in range(3, len(nodelist), 3):
|
|
node = nodelist[i]
|
|
if node[0] == symbol.except_clause:
|
|
# except_clause: 'except' [expr [',' expr]] */
|
|
if len(node) > 2:
|
|
expr1 = self.com_node(node[2])
|
|
if len(node) > 4:
|
|
expr2 = self.com_assign(node[4], OP_ASSIGN)
|
|
else:
|
|
expr2 = None
|
|
else:
|
|
expr1 = expr2 = None
|
|
clauses.append((expr1, expr2, self.com_node(nodelist[i+2])))
|
|
|
|
if node[0] == token.NAME:
|
|
elseNode = self.com_node(nodelist[i+2])
|
|
n = TryExcept(self.com_node(nodelist[2]), clauses, elseNode)
|
|
n.lineno = nodelist[0][2]
|
|
return n
|
|
|
|
def com_augassign_op(self, node):
|
|
assert node[0] == symbol.augassign
|
|
return node[1]
|
|
|
|
def com_augassign(self, node):
|
|
"""Return node suitable for lvalue of augmented assignment
|
|
|
|
Names, slices, and attributes are the only allowable nodes.
|
|
"""
|
|
l = self.com_node(node)
|
|
if l.__class__ in (Name, Slice, Subscript, Getattr):
|
|
return l
|
|
raise SyntaxError, "can't assign to %s" % l.__class__.__name__
|
|
|
|
def com_assign(self, node, assigning):
|
|
# return a node suitable for use as an "lvalue"
|
|
# loop to avoid trivial recursion
|
|
while 1:
|
|
t = node[0]
|
|
if t == symbol.exprlist or t == symbol.testlist:
|
|
if len(node) > 2:
|
|
return self.com_assign_tuple(node, assigning)
|
|
node = node[1]
|
|
elif t in _assign_types:
|
|
if len(node) > 2:
|
|
raise SyntaxError, "can't assign to operator"
|
|
node = node[1]
|
|
elif t == symbol.power:
|
|
if node[1][0] != symbol.atom:
|
|
raise SyntaxError, "can't assign to operator"
|
|
if len(node) > 2:
|
|
primary = self.com_node(node[1])
|
|
for i in range(2, len(node)-1):
|
|
ch = node[i]
|
|
if ch[0] == token.DOUBLESTAR:
|
|
raise SyntaxError, "can't assign to operator"
|
|
primary = self.com_apply_trailer(primary, ch)
|
|
return self.com_assign_trailer(primary, node[-1],
|
|
assigning)
|
|
node = node[1]
|
|
elif t == symbol.atom:
|
|
t = node[1][0]
|
|
if t == token.LPAR:
|
|
node = node[2]
|
|
if node[0] == token.RPAR:
|
|
raise SyntaxError, "can't assign to ()"
|
|
elif t == token.LSQB:
|
|
node = node[2]
|
|
if node[0] == token.RSQB:
|
|
raise SyntaxError, "can't assign to []"
|
|
return self.com_assign_list(node, assigning)
|
|
elif t == token.NAME:
|
|
return self.com_assign_name(node[1], assigning)
|
|
else:
|
|
raise SyntaxError, "can't assign to literal"
|
|
else:
|
|
raise SyntaxError, "bad assignment"
|
|
|
|
def com_assign_tuple(self, node, assigning):
|
|
assigns = []
|
|
for i in range(1, len(node), 2):
|
|
assigns.append(self.com_assign(node[i], assigning))
|
|
return AssTuple(assigns)
|
|
|
|
def com_assign_list(self, node, assigning):
|
|
assigns = []
|
|
for i in range(1, len(node), 2):
|
|
assigns.append(self.com_assign(node[i], assigning))
|
|
return AssList(assigns)
|
|
|
|
def com_assign_name(self, node, assigning):
|
|
n = AssName(node[1], assigning)
|
|
n.lineno = node[2]
|
|
return n
|
|
|
|
def com_assign_trailer(self, primary, node, assigning):
|
|
t = node[1][0]
|
|
if t == token.DOT:
|
|
return self.com_assign_attr(primary, node[2], assigning)
|
|
if t == token.LSQB:
|
|
return self.com_subscriptlist(primary, node[2], assigning)
|
|
if t == token.LPAR:
|
|
raise SyntaxError, "can't assign to function call"
|
|
raise SyntaxError, "unknown trailer type: %s" % t
|
|
|
|
def com_assign_attr(self, primary, node, assigning):
|
|
return AssAttr(primary, node[1], assigning)
|
|
|
|
def com_binary(self, constructor, nodelist):
|
|
"Compile 'NODE (OP NODE)*' into (type, [ node1, ..., nodeN ])."
|
|
l = len(nodelist)
|
|
if l == 1:
|
|
n = nodelist[0]
|
|
return self.lookup_node(n)(n[1:])
|
|
items = []
|
|
for i in range(0, l, 2):
|
|
n = nodelist[i]
|
|
items.append(self.lookup_node(n)(n[1:]))
|
|
return constructor(items)
|
|
|
|
def com_stmt(self, node):
|
|
result = self.lookup_node(node)(node[1:])
|
|
assert result is not None
|
|
if isinstance(result, Stmt):
|
|
return result
|
|
return Stmt([result])
|
|
|
|
def com_append_stmt(self, stmts, node):
|
|
result = self.com_node(node)
|
|
assert result is not None
|
|
if isinstance(result, Stmt):
|
|
stmts.extend(result.nodes)
|
|
else:
|
|
stmts.append(result)
|
|
|
|
if hasattr(symbol, 'list_for'):
|
|
def com_list_constructor(self, nodelist):
|
|
# listmaker: test ( list_for | (',' test)* [','] )
|
|
values = []
|
|
for i in range(1, len(nodelist)):
|
|
if nodelist[i][0] == symbol.list_for:
|
|
assert len(nodelist[i:]) == 1
|
|
return self.com_list_comprehension(values[0],
|
|
nodelist[i])
|
|
elif nodelist[i][0] == token.COMMA:
|
|
continue
|
|
values.append(self.com_node(nodelist[i]))
|
|
return List(values)
|
|
|
|
def com_list_comprehension(self, expr, node):
|
|
# list_iter: list_for | list_if
|
|
# list_for: 'for' exprlist 'in' testlist [list_iter]
|
|
# list_if: 'if' test [list_iter]
|
|
|
|
# XXX should raise SyntaxError for assignment
|
|
|
|
lineno = node[1][2]
|
|
fors = []
|
|
while node:
|
|
t = node[1][1]
|
|
if t == 'for':
|
|
assignNode = self.com_assign(node[2], OP_ASSIGN)
|
|
listNode = self.com_node(node[4])
|
|
newfor = ListCompFor(assignNode, listNode, [])
|
|
newfor.lineno = node[1][2]
|
|
fors.append(newfor)
|
|
if len(node) == 5:
|
|
node = None
|
|
else:
|
|
node = self.com_list_iter(node[5])
|
|
elif t == 'if':
|
|
test = self.com_node(node[2])
|
|
newif = ListCompIf(test)
|
|
newif.lineno = node[1][2]
|
|
newfor.ifs.append(newif)
|
|
if len(node) == 3:
|
|
node = None
|
|
else:
|
|
node = self.com_list_iter(node[3])
|
|
else:
|
|
raise SyntaxError, \
|
|
("unexpected list comprehension element: %s %d"
|
|
% (node, lineno))
|
|
n = ListComp(expr, fors)
|
|
n.lineno = lineno
|
|
return n
|
|
|
|
def com_list_iter(self, node):
|
|
assert node[0] == symbol.list_iter
|
|
return node[1]
|
|
else:
|
|
def com_list_constructor(self, nodelist):
|
|
values = []
|
|
for i in range(1, len(nodelist), 2):
|
|
values.append(self.com_node(nodelist[i]))
|
|
return List(values)
|
|
|
|
def com_dictmaker(self, nodelist):
|
|
# dictmaker: test ':' test (',' test ':' value)* [',']
|
|
items = []
|
|
for i in range(1, len(nodelist), 4):
|
|
items.append((self.com_node(nodelist[i]),
|
|
self.com_node(nodelist[i+2])))
|
|
return Dict(items)
|
|
|
|
def com_apply_trailer(self, primaryNode, nodelist):
|
|
t = nodelist[1][0]
|
|
if t == token.LPAR:
|
|
return self.com_call_function(primaryNode, nodelist[2])
|
|
if t == token.DOT:
|
|
return self.com_select_member(primaryNode, nodelist[2])
|
|
if t == token.LSQB:
|
|
return self.com_subscriptlist(primaryNode, nodelist[2], OP_APPLY)
|
|
|
|
raise SyntaxError, 'unknown node type: %s' % t
|
|
|
|
def com_select_member(self, primaryNode, nodelist):
|
|
if nodelist[0] != token.NAME:
|
|
raise SyntaxError, "member must be a name"
|
|
n = Getattr(primaryNode, nodelist[1])
|
|
n.lineno = nodelist[2]
|
|
return n
|
|
|
|
def com_call_function(self, primaryNode, nodelist):
|
|
if nodelist[0] == token.RPAR:
|
|
return CallFunc(primaryNode, [])
|
|
args = []
|
|
kw = 0
|
|
len_nodelist = len(nodelist)
|
|
for i in range(1, len_nodelist, 2):
|
|
node = nodelist[i]
|
|
if node[0] == token.STAR or node[0] == token.DOUBLESTAR:
|
|
break
|
|
kw, result = self.com_argument(node, kw)
|
|
args.append(result)
|
|
else:
|
|
# No broken by star arg, so skip the last one we processed.
|
|
i = i + 1
|
|
if i < len_nodelist and nodelist[i][0] == token.COMMA:
|
|
# need to accept an application that looks like "f(a, b,)"
|
|
i = i + 1
|
|
star_node = dstar_node = None
|
|
while i < len_nodelist:
|
|
tok = nodelist[i]
|
|
ch = nodelist[i+1]
|
|
i = i + 3
|
|
if tok[0]==token.STAR:
|
|
if star_node is not None:
|
|
raise SyntaxError, 'already have the varargs indentifier'
|
|
star_node = self.com_node(ch)
|
|
elif tok[0]==token.DOUBLESTAR:
|
|
if dstar_node is not None:
|
|
raise SyntaxError, 'already have the kwargs indentifier'
|
|
dstar_node = self.com_node(ch)
|
|
else:
|
|
raise SyntaxError, 'unknown node type: %s' % tok
|
|
|
|
return CallFunc(primaryNode, args, star_node, dstar_node)
|
|
|
|
def com_argument(self, nodelist, kw):
|
|
if len(nodelist) == 2:
|
|
if kw:
|
|
raise SyntaxError, "non-keyword arg after keyword arg"
|
|
return 0, self.com_node(nodelist[1])
|
|
result = self.com_node(nodelist[3])
|
|
n = nodelist[1]
|
|
while len(n) == 2 and n[0] != token.NAME:
|
|
n = n[1]
|
|
if n[0] != token.NAME:
|
|
raise SyntaxError, "keyword can't be an expression (%s)"%n[0]
|
|
node = Keyword(n[1], result)
|
|
node.lineno = n[2]
|
|
return 1, node
|
|
|
|
def com_subscriptlist(self, primary, nodelist, assigning):
|
|
# slicing: simple_slicing | extended_slicing
|
|
# simple_slicing: primary "[" short_slice "]"
|
|
# extended_slicing: primary "[" slice_list "]"
|
|
# slice_list: slice_item ("," slice_item)* [","]
|
|
|
|
# backwards compat slice for '[i:j]'
|
|
if len(nodelist) == 2:
|
|
sub = nodelist[1]
|
|
if (sub[1][0] == token.COLON or \
|
|
(len(sub) > 2 and sub[2][0] == token.COLON)) and \
|
|
sub[-1][0] != symbol.sliceop:
|
|
return self.com_slice(primary, sub, assigning)
|
|
|
|
subscripts = []
|
|
for i in range(1, len(nodelist), 2):
|
|
subscripts.append(self.com_subscript(nodelist[i]))
|
|
|
|
return Subscript(primary, assigning, subscripts)
|
|
|
|
def com_subscript(self, node):
|
|
# slice_item: expression | proper_slice | ellipsis
|
|
ch = node[1]
|
|
t = ch[0]
|
|
if t == token.DOT and node[2][0] == token.DOT:
|
|
return Ellipsis()
|
|
if t == token.COLON or len(node) > 2:
|
|
return self.com_sliceobj(node)
|
|
return self.com_node(ch)
|
|
|
|
def com_sliceobj(self, node):
|
|
# proper_slice: short_slice | long_slice
|
|
# short_slice: [lower_bound] ":" [upper_bound]
|
|
# long_slice: short_slice ":" [stride]
|
|
# lower_bound: expression
|
|
# upper_bound: expression
|
|
# stride: expression
|
|
#
|
|
# Note: a stride may be further slicing...
|
|
|
|
items = []
|
|
|
|
if node[1][0] == token.COLON:
|
|
items.append(Const(None))
|
|
i = 2
|
|
else:
|
|
items.append(self.com_node(node[1]))
|
|
# i == 2 is a COLON
|
|
i = 3
|
|
|
|
if i < len(node) and node[i][0] == symbol.test:
|
|
items.append(self.com_node(node[i]))
|
|
i = i + 1
|
|
else:
|
|
items.append(Const(None))
|
|
|
|
# a short_slice has been built. look for long_slice now by looking
|
|
# for strides...
|
|
for j in range(i, len(node)):
|
|
ch = node[j]
|
|
if len(ch) == 2:
|
|
items.append(Const(None))
|
|
else:
|
|
items.append(self.com_node(ch[2]))
|
|
|
|
return Sliceobj(items)
|
|
|
|
def com_slice(self, primary, node, assigning):
|
|
# short_slice: [lower_bound] ":" [upper_bound]
|
|
lower = upper = None
|
|
if len(node) == 3:
|
|
if node[1][0] == token.COLON:
|
|
upper = self.com_node(node[2])
|
|
else:
|
|
lower = self.com_node(node[1])
|
|
elif len(node) == 4:
|
|
lower = self.com_node(node[1])
|
|
upper = self.com_node(node[3])
|
|
return Slice(primary, assigning, lower, upper)
|
|
|
|
def get_docstring(self, node, n=None):
|
|
if n is None:
|
|
n = node[0]
|
|
node = node[1:]
|
|
if n == symbol.suite:
|
|
if len(node) == 1:
|
|
return self.get_docstring(node[0])
|
|
for sub in node:
|
|
if sub[0] == symbol.stmt:
|
|
return self.get_docstring(sub)
|
|
return None
|
|
if n == symbol.file_input:
|
|
for sub in node:
|
|
if sub[0] == symbol.stmt:
|
|
return self.get_docstring(sub)
|
|
return None
|
|
if n == symbol.atom:
|
|
if node[0][0] == token.STRING:
|
|
s = ''
|
|
for t in node:
|
|
s = s + eval(t[1])
|
|
return s
|
|
return None
|
|
if n == symbol.stmt or n == symbol.simple_stmt \
|
|
or n == symbol.small_stmt:
|
|
return self.get_docstring(node[0])
|
|
if n in _doc_nodes and len(node) == 1:
|
|
return self.get_docstring(node[0])
|
|
return None
|
|
|
|
|
|
_doc_nodes = [
|
|
symbol.expr_stmt,
|
|
symbol.testlist,
|
|
symbol.test,
|
|
symbol.and_test,
|
|
symbol.not_test,
|
|
symbol.comparison,
|
|
symbol.expr,
|
|
symbol.xor_expr,
|
|
symbol.and_expr,
|
|
symbol.shift_expr,
|
|
symbol.arith_expr,
|
|
symbol.term,
|
|
symbol.factor,
|
|
symbol.power,
|
|
]
|
|
|
|
# comp_op: '<' | '>' | '=' | '>=' | '<=' | '<>' | '!=' | '=='
|
|
# | 'in' | 'not' 'in' | 'is' | 'is' 'not'
|
|
_cmp_types = {
|
|
token.LESS : '<',
|
|
token.GREATER : '>',
|
|
token.EQEQUAL : '==',
|
|
token.EQUAL : '==',
|
|
token.LESSEQUAL : '<=',
|
|
token.GREATEREQUAL : '>=',
|
|
token.NOTEQUAL : '!=',
|
|
}
|
|
|
|
_legal_node_types = [
|
|
symbol.funcdef,
|
|
symbol.classdef,
|
|
symbol.stmt,
|
|
symbol.small_stmt,
|
|
symbol.flow_stmt,
|
|
symbol.simple_stmt,
|
|
symbol.compound_stmt,
|
|
symbol.expr_stmt,
|
|
symbol.print_stmt,
|
|
symbol.del_stmt,
|
|
symbol.pass_stmt,
|
|
symbol.break_stmt,
|
|
symbol.continue_stmt,
|
|
symbol.return_stmt,
|
|
symbol.raise_stmt,
|
|
symbol.import_stmt,
|
|
symbol.global_stmt,
|
|
symbol.exec_stmt,
|
|
symbol.assert_stmt,
|
|
symbol.if_stmt,
|
|
symbol.while_stmt,
|
|
symbol.for_stmt,
|
|
symbol.try_stmt,
|
|
symbol.suite,
|
|
symbol.testlist,
|
|
symbol.test,
|
|
symbol.and_test,
|
|
symbol.not_test,
|
|
symbol.comparison,
|
|
symbol.exprlist,
|
|
symbol.expr,
|
|
symbol.xor_expr,
|
|
symbol.and_expr,
|
|
symbol.shift_expr,
|
|
symbol.arith_expr,
|
|
symbol.term,
|
|
symbol.factor,
|
|
symbol.power,
|
|
symbol.atom,
|
|
]
|
|
|
|
if hasattr(symbol, 'yield_stmt'):
|
|
_legal_node_types.append(symbol.yield_stmt)
|
|
|
|
_assign_types = [
|
|
symbol.test,
|
|
symbol.and_test,
|
|
symbol.not_test,
|
|
symbol.comparison,
|
|
symbol.expr,
|
|
symbol.xor_expr,
|
|
symbol.and_expr,
|
|
symbol.shift_expr,
|
|
symbol.arith_expr,
|
|
symbol.term,
|
|
symbol.factor,
|
|
]
|
|
|
|
import types
|
|
_names = {}
|
|
for k, v in symbol.sym_name.items():
|
|
_names[k] = v
|
|
for k, v in token.tok_name.items():
|
|
_names[k] = v
|
|
|
|
def debug_tree(tree):
|
|
l = []
|
|
for elt in tree:
|
|
if type(elt) == types.IntType:
|
|
l.append(_names.get(elt, elt))
|
|
elif type(elt) == types.StringType:
|
|
l.append(elt)
|
|
else:
|
|
l.append(debug_tree(elt))
|
|
return l
|