mirror of https://github.com/python/cpython.git
1199 lines
33 KiB
Python
1199 lines
33 KiB
Python
# Copyright 1997-1998 Greg Stein and Bill Tutt
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#
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# transformer.py -- transforms Python parse trees
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#
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# Takes an input parse tree and transforms it into a higher-level parse
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# tree that is a bit more amenable to code generation. Essentially, it
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# simply introduces some additional semantics.
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#
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# 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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# Support for Node subclasses written by
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# Jeremy Hylton (jeremy@cnri.reston.va.us)
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#
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# The output tree has the following nodes:
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#
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# Source Python line #'s appear at the end of each of all of these nodes
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# If a line # doesn't apply, there will be a None instead.
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#
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# module: doc, node
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# stmt: [ node1, ..., nodeN ]
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# function: name, argnames, defaults, flags, doc, codeNode
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# lambda: argnames, defaults, flags, codeNode
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# classdef: name, bases, doc, codeNode
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# pass:
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# break:
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# continue:
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# for: assignNode, listNode, bodyNode, elseNode
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# while: testNode, bodyNode, elseNode
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# if: [ (testNode, suiteNode), ... ], elseNode
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# exec: expr1Node, expr2Node, expr3Node
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# from: modname, [ name1, ..., nameN ]
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# import: [ name1, ..., nameN ]
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# raise: expr1Node, expr2Node, expr3Node
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# tryfinally: trySuiteNode, finSuiteNode
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# tryexcept: trySuiteNode, [ (exprNode, assgnNode, suiteNode), ... ], elseNode
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# return: valueNode
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# const: value
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# print: [ node1, ..., nodeN ]
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# printnl: [ node1, ..., nodeN ]
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# discard: exprNode
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# assign: [ node1, ..., nodeN ], exprNode
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# ass_tuple: [ node1, ..., nodeN ]
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# ass_list: [ node1, ..., nodeN ]
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# ass_name: name, flags
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# ass_attr: exprNode, attrname, flags
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# list: [ node1, ..., nodeN ]
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# dict: [ (key1, val1), ..., (keyN, valN) ]
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# not: exprNode
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# compare: exprNode, [ (op, node), ..., (op, node) ]
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# name: name
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# global: [ name1, ..., nameN ]
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# backquote: node
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# getattr: exprNode, attrname
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# call_func: node, [ arg1, ..., argN ]
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# keyword: name, exprNode
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# subscript: exprNode, flags, [ sub1, ..., subN ]
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# ellipsis:
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# sliceobj: [ node1, ..., nodeN ]
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# slice: exprNode, flags, lowerNode, upperNode
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# assert: expr1, expr2
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#
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# Compiled as "binary" ops:
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# tuple: [ node1, ..., nodeN ]
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# or: [ node1, ..., nodeN ]
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# and: [ node1, ..., nodeN ]
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# bitor: [ node1, ..., nodeN ]
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# bitxor: [ node1, ..., nodeN ]
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# bitand: [ node1, ..., nodeN ]
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#
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# Operations easily evaluateable on constants:
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# <<: exprNode, shiftNode
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# >>: exprNode, shiftNode
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# +: leftNode, rightNode
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# -: leftNode, rightNode
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# *: leftNode, rightNode
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# /: leftNode, rightNode
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# %: leftNode, rightNode
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# power: leftNode, rightNode
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# unary+: node
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# unary-: node
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# invert: node
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#
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"""Parse tree transformation module.
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Exposes the Transformer class with a number of methods for returning a
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"cleansed AST" instead of the parse tree that the parser exposes.
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"""
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import ast
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import parser
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import symbol
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import token
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import string
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import pprint
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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 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 ast.nodes.has_key(kind):
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try:
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return apply(ast.nodes[kind], args[1:])
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except TypeError:
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print ast.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."
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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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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,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 Node('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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stmts = [ ]
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for node in nodelist:
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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 Node('module', doc, Node('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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n = Node('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 = Node('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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n = Node('classdef', 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 Node('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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# testlist ('=' testlist)*
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exprNode = self.com_node(nodelist[-1])
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if len(nodelist) == 1:
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return Node('discard', exprNode)
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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 = Node('assign', nodes, exprNode)
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n.lineno = nodelist[1][2]
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return n
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def print_stmt(self, nodelist):
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# print: (test ',')* [test]
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items = [ ]
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for i in range(1, 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 = Node('print', items)
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n.lineno = nodelist[0][2]
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return n
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n = Node('printnl', items)
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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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# pass:
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n = Node('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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# break:
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n = Node('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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# continue
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n = Node('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 = Node('return', Node('const', None))
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n.lineno = nodelist[0][2]
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return n
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n = Node('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 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 = Node('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: dotted_name (',' dotted_name)* |
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# from: dotted_name 'import' ('*' | NAME (',' NAME)*)
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names = [ ]
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if nodelist[0][1][0] == 'f':
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for i in range(3, len(nodelist), 2):
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# note: nodelist[i] could be (token.STAR, '*') or (token.NAME, name)
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names.append(nodelist[i][1])
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n = Node('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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for i in range(1, len(nodelist), 2):
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names.append(self.com_dotted_name(nodelist[i]))
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n = Node('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 = Node('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 = Node('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 = Node('name', 'None')
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n = Node('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 = Node('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 = Node('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 = Node('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 Node('stmt', stmts)
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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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exprlist = testlist
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def test(self, nodelist):
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# and_test ('or' and_test)* | lambdef
|
|
if len(nodelist) == 1 and nodelist[0][0] == symbol.lambdef:
|
|
return self.lambdef(nodelist[0])
|
|
return self.com_binary('or', nodelist)
|
|
|
|
def and_test(self, nodelist):
|
|
# not_test ('and' not_test)*
|
|
return self.com_binary('and', nodelist)
|
|
|
|
def not_test(self, nodelist):
|
|
# 'not' not_test | comparison
|
|
result = self.com_node(nodelist[-1])
|
|
if len(nodelist) == 2:
|
|
n = Node('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 = Node('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 = Node('<<', [node, right])
|
|
node.lineno = nodelist[1][2]
|
|
else:
|
|
node = Node('>>', [node, right])
|
|
node.lineno = nodelist[1][2]
|
|
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 = Node('+', [node, right])
|
|
node.lineno = nodelist[1][2]
|
|
else:
|
|
node = Node('-', [node, right])
|
|
node.lineno = nodelist[1][2]
|
|
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])
|
|
if nodelist[i-1][0] == token.STAR:
|
|
node = Node('*', [node, right])
|
|
node.lineno = nodelist[1][2]
|
|
elif nodelist[i-1][0] == token.SLASH:
|
|
node = Node('/', [node, right])
|
|
node.lineno = nodelist[1][2]
|
|
else:
|
|
node = Node('%', [node, right])
|
|
node.lineno = nodelist[1][2]
|
|
return node
|
|
|
|
def factor(self, nodelist):
|
|
t = nodelist[0][0]
|
|
node = self.com_node(nodelist[-1])
|
|
if t == token.PLUS:
|
|
node = Node('unary+', node)
|
|
node.lineno = nodelist[0][2]
|
|
elif t == token.MINUS:
|
|
node = Node('unary-', node)
|
|
node.lineno = nodelist[0][2]
|
|
elif t == token.TILDE:
|
|
node = Node('invert', node)
|
|
node.lineno = nodelist[0][2]
|
|
return node
|
|
|
|
def power(self, nodelist):
|
|
# power: atom trailer* ('**' factor)*
|
|
node = self.com_node(nodelist[0])
|
|
for i in range(1, len(nodelist)):
|
|
if nodelist[i][0] == token.DOUBLESTAR:
|
|
n = Node('power', [node, self.com_node(nodelist[i+1])])
|
|
n.lineno = nodelist[i][2]
|
|
return n
|
|
|
|
node = self.com_apply_trailer(node, nodelist[i])
|
|
|
|
return node
|
|
|
|
def atom(self, nodelist):
|
|
t = nodelist[0][0]
|
|
if t == token.LPAR:
|
|
if nodelist[1][0] == token.RPAR:
|
|
n = Node('const', ())
|
|
n.lineno = nodelist[0][2]
|
|
return n
|
|
return self.com_node(nodelist[1])
|
|
|
|
if t == token.LSQB:
|
|
if nodelist[1][0] == token.RSQB:
|
|
n = Node('const', [ ])
|
|
n.lineno = nodelist[0][2]
|
|
return n
|
|
return self.com_list_constructor(nodelist[1])
|
|
|
|
if t == token.LBRACE:
|
|
if nodelist[1][0] == token.RBRACE:
|
|
return Node('const', { })
|
|
return self.com_dictmaker(nodelist[1])
|
|
|
|
if t == token.BACKQUOTE:
|
|
n = Node('backquote', self.com_node(nodelist[1]))
|
|
n.lineno = nodelist[0][2]
|
|
return n
|
|
|
|
if t == token.NUMBER:
|
|
### need to verify this matches compile.c
|
|
k = eval(nodelist[0][1])
|
|
n = Node('const', k)
|
|
n.lineno = nodelist[0][2]
|
|
return n
|
|
|
|
if t == token.STRING:
|
|
### need to verify this matches compile.c
|
|
k = ''
|
|
for node in nodelist:
|
|
k = k + eval(node[1])
|
|
n = Node('const', k)
|
|
n.lineno = nodelist[0][2]
|
|
return n
|
|
|
|
if t == token.NAME:
|
|
### any processing to do?
|
|
n = Node('name', nodelist[0][1])
|
|
n.lineno = nodelist[0][2]
|
|
return n
|
|
|
|
raise error, "unknown node type"
|
|
|
|
# --------------------------------------------------------------
|
|
#
|
|
# INTERNAL PARSING UTILITIES
|
|
#
|
|
|
|
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.
|
|
|
|
#
|
|
# A ';' at the end of a line can make a NEWLINE token appear here,
|
|
# Render it harmless. (genc discards ('discard', ('const', xxxx)) Nodes)
|
|
#
|
|
if node[0] == token.NEWLINE:
|
|
return Node('discard', Node('const', None))
|
|
|
|
if node[0] not in _legal_node_types:
|
|
raise error, 'illegal node passed to com_node: %s' % node[0]
|
|
|
|
return self._dispatch[node[0]](node[1:])
|
|
|
|
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
|
|
if nodelist[i][0] == token.DOUBLESTAR:
|
|
node = nodelist[i+1]
|
|
else:
|
|
node = nodelist[i+2]
|
|
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(Node('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_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 = Node('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 = Node('tryexcept', self.com_node(nodelist[2]), clauses, elseNode)
|
|
n.lineno = nodelist[0][2]
|
|
return n
|
|
|
|
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 Node('ass_tuple', 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 Node('ass_list', assigns)
|
|
|
|
def com_assign_name(self, node, assigning):
|
|
return Node('ass_name', node[1], assigning)
|
|
|
|
def com_assign_trailer(self, primary, node, assigning):
|
|
t = node[1][0]
|
|
if t == token.LPAR:
|
|
raise SyntaxError, "can't assign to function call"
|
|
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)
|
|
raise SyntaxError, "unknown trailer type: %s" % t
|
|
|
|
def com_assign_attr(self, primary, node, assigning):
|
|
return Node('ass_attr', primary, node[1], assigning)
|
|
|
|
def com_binary(self, type, nodelist):
|
|
"Compile 'NODE (OP NODE)*' into (type, [ node1, ..., nodeN ])."
|
|
if len(nodelist) == 1:
|
|
return self.com_node(nodelist[0])
|
|
items = [ ]
|
|
for i in range(0, len(nodelist), 2):
|
|
items.append(self.com_node(nodelist[i]))
|
|
return Node(type, items)
|
|
|
|
def com_stmt(self, node):
|
|
#pprint.pprint(node)
|
|
result = self.com_node(node)
|
|
try:
|
|
result[0]
|
|
except:
|
|
print node[0]
|
|
if result[0] == 'stmt':
|
|
return result
|
|
return Node('stmt', [ result ])
|
|
|
|
def com_append_stmt(self, stmts, node):
|
|
result = self.com_node(node)
|
|
try:
|
|
result[0]
|
|
except:
|
|
print node
|
|
if result[0] == 'stmt':
|
|
stmts[len(stmts):] = result[1]
|
|
else:
|
|
stmts.append(result)
|
|
|
|
def com_list_constructor(self, nodelist):
|
|
values = [ ]
|
|
for i in range(1, len(nodelist), 2):
|
|
values.append(self.com_node(nodelist[i]))
|
|
return Node('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 Node('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 = Node('getattr', primaryNode, nodelist[1])
|
|
n.lineno = nodelist[2]
|
|
return n
|
|
|
|
def com_call_function(self, primaryNode, nodelist):
|
|
if nodelist[0] == token.RPAR:
|
|
return Node('call_func', primaryNode, [ ])
|
|
args = [ ]
|
|
kw = 0
|
|
for i in range(1, len(nodelist), 2):
|
|
kw, result = self.com_argument(nodelist[i], kw)
|
|
args.append(result)
|
|
return Node('call_func', primaryNode, args)
|
|
|
|
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]
|
|
n = Node('keyword', n[1], result)
|
|
n.lineno = result.lineno
|
|
return 1, n
|
|
|
|
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 Node('subscript', primary, assigning, subscripts)
|
|
|
|
def com_subscript(self, node):
|
|
# slice_item: expression | proper_slice | ellipsis
|
|
ch = node[1]
|
|
if ch[0] == token.DOT and node[2][0] == token.DOT:
|
|
return ('ellipsis', None)
|
|
if ch[0] == 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(Node('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(Node('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(Node('const', None))
|
|
else:
|
|
items.append(self.com_node(ch[2]))
|
|
|
|
return Node('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 Node('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,
|
|
]
|
|
|
|
_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,
|
|
]
|
|
|
|
# Local Variables:
|
|
# mode: python
|
|
# indent-tabs-mode: nil
|
|
# py-indent-offset: 2
|
|
# py-smart-indentation: nil
|
|
# End:
|
|
|