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visitor.py
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855 lines (736 loc) · 35.9 KB
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#!/usr/bin/env python
# -*- coding: utf-8 -*-
# java2python.compiler.visitor -> Base classes for walking ASTs.
#
# This module defines classes that accept nodes during AST walking. These
# classes are the primary source of the language translation semantics as
# implemented by java2python.
#
# These classes implement the node handling behavior of the block classes built
# at runtime. These classes use their factory callable more often than their
# template counterparts; during walking, the typical behavior is to either define
# the specific Python source, or to defer it to another block, or both.
from functools import reduce, partial
from itertools import ifilter, ifilterfalse, izip, tee
from logging import debug, warn
from re import compile as recompile, sub as resub
from java2python.lang import tokens
from java2python.lib import FS
class Memo(object):
""" Memo -> AST walking luggage. """
def __init__(self):
self.comments, self.last = set(), 0
class Base(object):
""" Base -> Parent class for AST visitors. """
commentSubs = map(recompile, ['^\s*/(\*)+', '(\*)+/\s*$', '^\s*//'])
def accept(self, node, memo):
""" Accept a node, possibly creating a child visitor. """
tokType = tokens.map.get(node.token.type)
missing = lambda node, memo:self
call = getattr(self, 'accept{0}'.format(tokens.title(tokType)), missing)
if call is missing:
debug('no visitor accept method for %s', tokType)
return call(node, memo)
def insertComments(self, tmpl, tree, index, memo):
""" Add comments to the template from tokens in the tree. """
prefix = self.config.last('commentPrefix', '# ')
cache, parser, comTypes = memo.comments, tree.parser, tokens.commentTypes
comNew = lambda t:t.type in comTypes and t.index not in cache
for tok in ifilter(comNew, parser.input.tokens[memo.last:index]):
cache.add(tok.index)
# loop over parents until we find the top expression
base = tmpl
while base:
if base and base.parent and base.parent.isExpression:
base = base.parent
else:
break
if hasattr(base, 'tail') and tok.line==parser.input.tokens[index].line:
base.tail += prefix if not base.tail.startswith(prefix) else ''
base.tail += ''.join(self.stripComment(tok.text))
else:
for line in self.stripComment(tok.text):
self.factory.comment(left=prefix, right=line, parent=self)
memo.last = index
def stripComment(self, text):
""" Regex substitutions for comments; removes comment characters. """
subText = lambda value, regex:resub(regex, '', value)
for text in ifilter(unicode.strip, text.split('\n')):
yield reduce(subText, self.commentSubs, text)
def walk(self, tree, memo=None):
""" Depth-first visiting of the given AST. """
if not tree:
return
memo = Memo() if memo is None else memo
comIns = self.insertComments
comIns(self, tree, tree.tokenStartIndex, memo)
visitor = self.accept(tree, memo)
if visitor:
for child in tree.children:
visitor.walk(child, memo)
comIns(visitor, child, child.tokenStopIndex, memo)
comIns(self, tree, tree.tokenStopIndex, memo)
if tree.isJavaSource:
comIns(self, tree, len(tree.parser.input.tokens), memo)
# fixme: we're calling the mutators far too frequently instead
# of only once per object after its walk is finished.
for handler in self.configHandlers('PostWalk', suffix='Mutators'):
handler(self)
def zipWalk(self, nodes, visitors, memo):
""" Walk the given nodes zipped with the given visitors. """
for node, visitor in izip(nodes, visitors):
visitor.walk(node, memo)
def nodeTypeToString(self, node):
""" Returns the TYPE or QUALIFIED_TYPE_IDENT of the given node. """
alt = self.altIdent
ntype = node.firstChildOfType(tokens.TYPE)
nnext = ntype.children[0]
if nnext.type == tokens.QUALIFIED_TYPE_IDENT:
names = [alt(t.text) for t in nnext.childrenOfType(tokens.IDENT)]
stype = '.'.join(names)
else:
stype = nnext.text
return alt(stype)
class TypeAcceptor(object):
""" TypeAcceptor -> shared visitor method(s) for type declarations. """
def makeAcceptType(ft):
""" Creates an accept function for the given factory type. """
def acceptType(self, node, memo):
""" Creates and returns a new template for a type. """
try:
name = node.firstChildOfType(tokens.IDENT).text
except (AttributeError, ):
return
self.variables.append(name)
return getattr(self.factory, ft)(name=name, parent=self)
return acceptType
acceptAt = makeAcceptType('at')
acceptClass = makeAcceptType('klass')
acceptEnum = makeAcceptType('enum')
acceptInterface = makeAcceptType('interface')
class Module(TypeAcceptor, Base):
""" Module -> accepts AST branches for module-level objects. """
def makeAcceptHandledDecl(part):
""" Creates an accept function for a decl to be processed by a handler. """
def acceptDecl(self, node, memo):
""" Processes a decl by creating a new template expression. """
expr = self.factory.expr()
expr.walk(node.firstChild(), memo)
handler = self.configHandler(part)
if handler:
handler(self, expr)
return acceptDecl
acceptImport = makeAcceptHandledDecl('ImportDeclaration')
acceptPackage = makeAcceptHandledDecl('PackageDeclaration')
class ModifiersAcceptor(object):
""" ModifiersAcceptor -> shared behavior of classes and methods. """
def acceptModifierList(self, node, memo):
""" Accept and process class and method modifiers. """
isAnno = lambda token:token.type==tokens.AT
for ano in ifilter(isAnno, node.children):
self.nodesToAnnos(ano, memo)
for mod in ifilterfalse(isAnno, node.children):
self.nodesToModifiers(mod, node)
return self
def nodesToAnnos(self, branch, memo):
""" Convert the annotations in the given branch to a decorator. """
name = branch.firstChildOfType(tokens.IDENT).text
init = branch.firstChildOfType(tokens.ANNOTATION_INIT_BLOCK)
if not init:
deco = self.factory.expr(left=name, fs='@{left}()')
else:
defKey = init.firstChildOfType(tokens.ANNOTATION_INIT_DEFAULT_KEY)
if defKey:
deco = self.factory.expr(left=name, fs='@{left}({right})')
deco.right = right = self.factory.expr(parent=deco)
right.walk(defKey.firstChild())
else:
deco = self.factory.expr(left=name, fs='@{left}({right})')
arg = deco.right = self.factory.expr(parent=deco)
keys = init.firstChildOfType(tokens.ANNOTATION_INIT_KEY_LIST)
for child in keys.children:
fs, expr = child.text + '={right}', child.firstChild()
fs += (', ' if child is not keys.children[-1] else '')
arg.left = self.factory.expr(fs=fs, parent=arg)
arg.left.walk(expr, memo)
arg.right = arg = self.factory.expr(parent=arg)
self.decorators.append(deco)
def nodesToModifiers(self, branch, root):
""" Convert the modifiers in the given branch to template modifiers. """
if root.parentType in tokens.methodTypes:
self.modifiers.extend(n.text for n in root.children)
if self.isStatic and self.parameters:
self.parameters[0]['name'] = 'cls'
self.modifiers.append(branch.text)
class VarAcceptor(object):
""" Mixin for blocks that accept handle var declarations. """
def acceptVarDeclaration(self, node, memo):
""" Creates a new expression for a variable declaration. """
varDecls = node.firstChildOfType(tokens.VAR_DECLARATOR_LIST)
for varDecl in varDecls.childrenOfType(tokens.VAR_DECLARATOR):
ident = varDecl.firstChildOfType(tokens.IDENT)
self.variables.append(ident.text)
identExp = self.factory.expr(left=ident.text, parent=self)
identExp.type = self.nodeTypeToString(node)
if node.firstChildOfType(tokens.MODIFIER_LIST):
identExp.modifiers = [child.text for child in node.firstChildOfType(tokens.MODIFIER_LIST).children]
declExp = varDecl.firstChildOfType(tokens.EXPR)
assgnExp = identExp.pushRight(' = ')
declArr = varDecl.firstChildOfType(tokens.ARRAY_INITIALIZER)
if declExp:
assgnExp.walk(declExp, memo)
elif declArr:
assgnExp.right = exp = self.factory.expr(fs='['+FS.lr+']', parent=identExp)
children = list(declArr.childrenOfType(tokens.EXPR))
for child in children:
fs = FS.lr if child is children[-1] else FS.lr + ', '
exp.left = self.factory.expr(fs=fs, parent=identExp)
exp.left.walk(child, memo)
exp.right = exp = self.factory.expr(parent=identExp)
else:
if node.firstChildOfType(tokens.TYPE).firstChildOfType(tokens.ARRAY_DECLARATOR_LIST):
val = assgnExp.pushRight('[]')
else:
val = assgnExp.pushRight('{0}()'.format(identExp.type))
return self
class Class(VarAcceptor, TypeAcceptor, ModifiersAcceptor, Base):
""" Class -> accepts AST branches for class-level objects. """
def nodeIdentsToBases(self, node, memo):
""" Turns node idents into template bases. """
idents = node.findChildrenOfType(tokens.IDENT)
self.bases.extend(n.text for n in idents)
acceptExtendsClause = nodeIdentsToBases
acceptImplementsClause = nodeIdentsToBases
def acceptAt(self, node, memo):
""" Accept and ignore an annotation declaration. """
# this overrides the TypeAcceptor implementation and
# ignores AT tokens; they're sent within the class modifier
# list and we have no use for them here.
def acceptConstructorDecl(self, node, memo):
""" Accept and process a constructor declaration. """
method = self.factory.method(name='__init__', type=self.name, parent=self)
superCalls = node.findChildrenOfType(tokens.SUPER_CONSTRUCTOR_CALL)
if not any(superCalls) and any(self.bases):
# from the java tutorial:
# Note: If a constructor does not explicitly invoke a
# superclass constructor, the Java compiler automatically
# inserts a call to the no-argument constructor of the
# superclass.
fs = 'super(' + FS.r + ', self).__init__()'
self.factory.expr(fs=fs, right=self.name, parent=method)
return method
def acceptFunctionMethodDecl(self, node, memo):
""" Accept and process a typed method declaration. """
ident = node.firstChildOfType(tokens.IDENT)
type = node.firstChildOfType(tokens.TYPE).children[0].text
mods = node.firstChildOfType(tokens.MODIFIER_LIST)
self.variables.append(ident.text)
return self.factory.method(name=ident.text, type=type, parent=self)
def acceptVoidMethodDecl(self, node, memo):
""" Accept and process a void method declaration. """
ident = node.firstChildOfType(tokens.IDENT)
mods = node.firstChildOfType(tokens.MODIFIER_LIST)
self.variables.append(ident.text)
return self.factory.method(name=ident.text, type='void', parent=self)
class Annotation(Class):
""" Annotation -> accepts AST branches for Java annotations. """
def acceptAnnotationTopLevelScope(self, node, memo):
""" Accept and process an annotation scope. """
# We're processing the entire annotation top level scope here
# so as to easily find all of the default values and construct
# the various python statements in one pass.
args = []
for child in node.children:
if child.type == tokens.ANNOTATION_METHOD_DECL:
mods, type, ident = child.children[0:3]
type, name = type.children[0].text, ident.text
meth = self.factory.method(parent=self, name=name, type=type)
meth.factory.expr(fs='return self._{left}', parent=meth, left=name)
default = child.children[3] if len(child.children) > 3 else None
args.append((name, type, default))
elif child.type == tokens.VAR_DECLARATION:
self.acceptVarDeclaration(child, memo)
else:
self.walk(child, memo)
self.addCall(args, memo)
self.addInit(args, memo)
self.children.sort(lambda a, b:-1 if a.name == '__call__' else 0)
self.children.sort(lambda a, b:-1 if a.name == '__init__' else 0)
def addInit(self, args, memo):
""" Make an __init__ function in this annotation class. """
meth = self.factory.method(parent=self, name='__init__')
factory = partial(meth.factory.expr, fs='self._{left} = {right}', parent=meth)
for name, type, default in args:
if default is not None:
expr = self.factory.expr()
expr.walk(default, memo)
else:
expr = None
meth.parameters.append(self.makeParam(name, type, default=expr))
factory(left=name, right=name)
def addCall(self, args, memo):
""" Make a __call__ function in this class (so it's a decorator). """
meth = self.factory.method(parent=self, name='__call__')
meth.parameters.append(self.makeParam('obj', 'object'))
factory = partial(self.factory.expr, parent=meth)
factory(fs='setattr(obj, self.__class__.__name__, self)')
factory(fs='return obj')
class Enum(Class):
""" Enum -> accepts AST branches for Java enums. """
def acceptEnumTopLevelScope(self, node, memo):
""" Accept and process an enum scope """
idents = node.childrenOfType(tokens.IDENT)
factory = self.factory.expr
handler = self.configHandler('Value')
setFs = lambda v:'{0}.{1} = {2}'.format(self.name, v, self.name)
for index, ident in enumerate(idents):
args = list(ident.findChildrenOfType(tokens.ARGUMENT_LIST))
if args:
call = factory(left=setFs(ident), parent=self.parent)
call.right = arg = factory(fs='('+FS.lr+')')
argl = ident.firstChildOfType(tokens.ARGUMENT_LIST)
exprs = list(argl.findChildrenOfType(tokens.EXPR))
for expr in exprs:
fs = FS.r + ('' if expr is exprs[-1] else ', ')
arg.left = factory(fs=fs)
arg.left.walk(expr, memo)
arg.right = arg = factory()
else:
expr = factory(fs=ident.text+' = '+FS.r, parent=self)
expr.pushRight(handler(self, index, ident.text))
return self
class Interface(Class):
""" Interface -> accepts AST branches for Java interfaces. """
class MethodContent(Base):
""" MethodContent -> accepts trees for blocks within methods. """
def acceptAssert(self, node, memo):
""" Accept and process an assert statement. """
assertStat = self.factory.statement('assert', fs=FS.lsr, parent=self)
assertStat.expr.walk(node.firstChild(), memo)
def acceptBreak(self, node, memo):
""" Accept and process a break statement. """
# possible parents of a break statement: switch, while, do, for
# we want to skip inserting a break statement if we're inside a switch.
insert, ok_types = True, [tokens.WHILE, tokens.DO, tokens.FOR]
for parent in node.parents():
if parent.type == tokens.SWITCH:
insert = False
break
if parent.type in ok_types:
break
if insert:
if len(node.children):
warn('Detected unhandled break statement with label; generated code incorrect.')
breakStat = self.factory.statement('break', parent=self)
def acceptCatch(self, node, memo):
""" Accept and process a catch statement. """
decl = node.firstChildOfType(tokens.FORMAL_PARAM_STD_DECL)
dtype = decl.firstChildOfType(tokens.TYPE)
tnames = dtype.findChildrenOfType(tokens.IDENT)
cname = '.'.join(n.text for n in tnames)
cvar = decl.firstChildOfType(tokens.IDENT)
block = node.firstChildOfType(tokens.BLOCK_SCOPE)
if not block.children:
self.factory.expr(left='pass', parent=self)
self.expr.fs = FS.lsrc
self.expr.right = self.factory.expr(fs=FS.l+' as '+FS.r, left=cname, right=cvar)
self.walk(block, memo)
def acceptContinue(self, node, memo):
""" Accept and process a continue statement. """
contStat = self.factory.statement('continue', fs=FS.lsr, parent=self)
if len(node.children):
warn('Detected unhandled continue statement with label; generated code incorrect.')
def acceptDo(self, node, memo):
""" Accept and process a do-while block. """
# DO - BLOCK_SCOPE - PARENTESIZED_EXPR
blkNode, parNode = node.children
whileStat = self.factory.statement('while', fs=FS.lsrc, parent=self)
whileStat.expr.right = 'True'
whileStat.walk(blkNode, memo)
fs = FS.l+ ' ' + 'not ({right}):'
ifStat = self.factory.statement('if', fs=fs, parent=whileStat)
ifStat.expr.walk(parNode, memo)
breakStat = self.factory.statement('break', parent=ifStat)
goodExprParents = (
tokens.BLOCK_SCOPE,
tokens.CASE,
tokens.DEFAULT,
tokens.FOR_EACH,
tokens.METHOD_CALL,
tokens.ARGUMENT_LIST,
)
def acceptExpr(self, node, memo):
""" Creates a new expression. """
# this works but isn't precise
if node.parentType in self.goodExprParents:
return self.factory.expr(parent=self)
def acceptFor(self, node, memo):
""" Accept and process a 'for' statement. """
self.walk(node.firstChildOfType(tokens.FOR_INIT))
whileStat = self.factory.statement('while', fs=FS.lsrc, parent=self)
cond = node.firstChildOfType(tokens.FOR_CONDITION)
if not cond.children:
whileStat.expr.right = 'True'
else:
whileStat.expr.walk(cond)
whileBlock = self.factory.methodContent(parent=self)
whileBlock.walk(node.firstChildOfType(tokens.BLOCK_SCOPE))
updateStat = self.factory.expr(parent=whileBlock)
updateStat.walk(node.firstChildOfType(tokens.FOR_UPDATE))
def acceptForEach(self, node, memo):
""" Accept and process a 'for each' style statement. """
forEach = self.factory.statement('for', fs=FS.lsrc, parent=self)
identExpr = forEach.expr.right = self.factory.expr(fs=FS.l+' in '+FS.r)
identExpr.walk(node.firstChildOfType(tokens.IDENT), memo)
inExpr = identExpr.right = self.factory.expr()
inExpr.walk(node.firstChildOfType(tokens.EXPR), memo)
forBlock = self.factory.methodContent(parent=self)
forBlock.walk(node.children[4], memo)
def acceptIf(self, node, memo):
""" Accept and process an if statement. """
children = node.children
ifStat = self.factory.statement('if', fs=FS.lsrc, parent=self)
ifStat.expr.walk(children[0], memo)
if node.children[1].type == tokens.EXPR:
ifBlock = self.factory.expr(parent=ifStat)
ifBlock.walk(node.children[1], memo)
else:
ifBlock = self.factory.methodContent(parent=self)
ifBlock.walk(node.children[1], memo)
if len(children) == 3:
nextNode = children[2]
nextType = nextNode.type
while nextType == tokens.IF:
nextStat = self.factory.statement('elif', fs=FS.lsrc, parent=self)
nextStat.expr.walk(nextNode.children[0], memo)
if nextNode.children[1].type == tokens.EXPR:
nextBlock = self.factory.expr(parent=nextStat)
else:
nextBlock = self.factory.methodContent(parent=self)
nextBlock.walk(nextNode.children[1], memo)
nextNode = nextNode.children[2]
nextType = nextNode.type
if nextType == tokens.EXPR:
elseStat = self.factory.statement('else', fs=FS.lc, parent=self)
elseBlock = self.factory.expr(parent=elseStat)
elseBlock.walk(nextNode, memo)
else: # nextType != tokens.BLOCK_SCOPE:
self.factory.statement('else', fs=FS.lc, parent=self)
self.factory.methodContent(parent=self).walk(nextNode, memo)
def acceptSwitch(self, node, memo):
""" Accept and process a switch block. """
# This implementation needs a lot of work to handle case
# statements without breaks, out-of-order default labels, etc.
# Given the current size and complexity, consider growing a
# Case block type.
parNode = node.firstChildOfType(tokens.PARENTESIZED_EXPR)
lblNode = node.firstChildOfType(tokens.SWITCH_BLOCK_LABEL_LIST)
caseNodes = lblNode.children
# empty switch statement
if not len(caseNodes):
return
# we have at least one node...
parExpr = self.factory.expr(parent=self)
parExpr.walk(parNode)
eqFs = FS.l + '==' + FS.r
for caseIdx, caseNode in enumerate(caseNodes):
isDefault, isFirst = caseNode.type==tokens.DEFAULT, caseIdx==0
if isFirst:
caseExpr = self.factory.statement('if', fs=FS.lsrc, parent=self)
elif not isDefault:
caseExpr = self.factory.statement('elif', fs=FS.lsrc, parent=self)
elif isDefault:
caseExpr = self.factory.statement('else', fs=FS.lc, parent=self)
if not isDefault:
right = self.factory.expr(parent=parExpr)
right.walk(caseNode.firstChildOfType(tokens.EXPR))
caseExpr.expr.right = self.factory.expr(left=parExpr, right=right, fs=eqFs)
caseContent = self.factory.methodContent(parent=self)
for child in caseNode.children[1:]:
caseContent.walk(child, memo)
if not caseNode.children[1:]:
self.factory.expr(left='pass', parent=caseContent)
if isDefault:
if isFirst:
caseExpr.expr.right = 'True'
caseContent = self.factory.methodContent(parent=self)
for child in caseNode.children:
caseContent.walk(child, memo)
if not caseNode.children:
self.factory.expr(left='pass', parent=caseContent)
self.children.remove(parExpr)
def acceptSynchronized(self, node, memo):
""" Accept and process a synchronized statement (not a modifier). """
module = self.parents(lambda x:x.isModule).next()
module.needsSyncHelpers = True
if node.parent.type == tokens.MODIFIER_LIST:
# Skip any synchronized modifier
return
lockName = self.configHandler('LockFunction', 'Name', 'lock_for_object')
withFs = '{left} %s({right}):' % lockName
sync = self.factory.statement('with', fs=withFs, parent=self)
sync.expr.walk(node.children[0], memo)
sync.walk(node.children[1], memo)
def acceptThrow(self, node, memo):
""" Accept and process a throw statement. """
throw = self.factory.statement('raise', fs=FS.lsr, parent=self)
throw.expr.walk(node.children[0], memo)
def acceptTry(self, node, memo):
""" Accept and process a try/catch block. """
children = node.children
tryNode = children[0]
if len(children) == 3:
catchClausesNode, finNode = children[1:3]
elif len(children) == 2:
catchClausesNode = finNode = None
if children[1].type == tokens.CATCH_CLAUSE_LIST:
catchClausesNode = children[1]
else:
finNode = children[1]
tryStat = self.factory.statement('try', fs=FS.lc, parent=self)
tryStat.walk(tryNode, memo)
if catchClausesNode:
for catchNode in catchClausesNode.children:
exStat = self.factory.statement('except', fs=FS.lsrc, parent=self)
exStat.walk(catchNode, memo)
if finNode:
finStat = self.factory.statement('finally', fs=FS.lc, parent=self)
finStat.walk(finNode, memo)
goodReturnParents = (
tokens.BLOCK_SCOPE,
)
def acceptReturn(self, node, memo):
""" Creates a new return expression. """
# again, this works but isn't as precise as it should be
if node.parentType: # in self.goodReturnParents:
expr = self.factory.expr(left='return', parent=self)
if node.children:
expr.fs, expr.right = FS.lsr, self.factory.expr(parent=expr)
expr.right.walk(node, memo)
return expr
def acceptWhile(self, node, memo):
""" Accept and process a while block. """
# WHILE - PARENTESIZED_EXPR - BLOCK_SCOPE
parNode, blkNode = node.children
whileStat = self.factory.statement('while', fs=FS.lsrc, parent=self)
whileStat.expr.walk(parNode, memo)
if not blkNode.children:
self.factory.expr(left='pass', parent=whileStat)
else:
whileStat.walk(blkNode, memo)
class Method(VarAcceptor, ModifiersAcceptor, MethodContent):
""" Method -> accepts AST branches for method-level objects. """
def acceptFormalParamStdDecl(self, node, memo):
""" Accept and process a single parameter declaration. """
ident = node.firstChildOfType(tokens.IDENT)
ptype = self.nodeTypeToString(node)
self.parameters.append(self.makeParam(ident.text, ptype))
return self
def acceptFormalParamVarargDecl(self, node, memo):
""" Accept and process a var arg declaration. """
ident = node.firstChildOfType(tokens.IDENT)
param = {'name':'*{0}'.format(ident.text), 'type':'A'}
self.parameters.append(param)
return self
class Expression(Base):
""" Expression -> accepts trees for expression objects. """
def nodeTextExpr(self, node, memo):
""" Assigns node text to the left side of this expression. """
self.left = node.text
acceptCharacterLiteral = nodeTextExpr
acceptStringLiteral = nodeTextExpr
acceptFloatingPointLiteral = nodeTextExpr
acceptDecimalLiteral = nodeTextExpr
acceptHexLiteral = nodeTextExpr
acceptOctalLiteral = nodeTextExpr
acceptTrue = nodeTextExpr
acceptFalse = nodeTextExpr
acceptNull = nodeTextExpr
def nodeOpExpr(self, node, memo):
""" Accept and processes an operator expression. """
factory = self.factory.expr
self.fs = FS.l + ' ' + node.text + ' ' + FS.r
self.left, self.right = visitors = factory(parent=self), factory()
self.zipWalk(node.children, visitors, memo)
acceptAnd = nodeOpExpr
acceptAndAssign = nodeOpExpr
acceptAssign = nodeOpExpr
acceptDivAssign = nodeOpExpr
acceptEqual = nodeOpExpr
acceptGreaterOrEqual = nodeOpExpr
acceptGreaterThan = nodeOpExpr
acceptLessOrEqual = nodeOpExpr
acceptLessThan = nodeOpExpr
acceptMinusAssign = nodeOpExpr
acceptMod = nodeOpExpr
acceptModAssign = nodeOpExpr
acceptNotEqual = nodeOpExpr
acceptOr = nodeOpExpr
acceptOrAssign = nodeOpExpr
acceptPlusAssign = nodeOpExpr
acceptShiftLeft = nodeOpExpr
acceptShiftLeftAssign = nodeOpExpr
acceptShiftRight = nodeOpExpr
acceptShiftRightAssign = nodeOpExpr
acceptStarAssign = nodeOpExpr
acceptXor = nodeOpExpr
acceptXorAssign = nodeOpExpr
def makeNodePreformattedExpr(fs):
""" Make an accept method for expressions with a predefined format string. """
def acceptPreformatted(self, node, memo):
expr = self.factory.expr
self.fs = fs
self.left, self.right = vs = expr(parent=self), expr(parent=self)
self.zipWalk(node.children, vs, memo)
return acceptPreformatted
acceptArrayElementAccess = makeNodePreformattedExpr(FS.l + '[' + FS.r + ']')
acceptCastExpr = makeNodePreformattedExpr(FS.l + '(' + FS.r + ')' ) # problem?
acceptDiv = makeNodePreformattedExpr(FS.l + ' / ' + FS.r)
acceptLogicalAnd = makeNodePreformattedExpr(FS.l + ' and ' + FS.r)
acceptLogicalNot = makeNodePreformattedExpr('not ' + FS.l)
acceptLogicalOr = makeNodePreformattedExpr(FS.l + ' or ' + FS.r)
acceptMinus = makeNodePreformattedExpr(FS.l + ' - ' + FS.r)
acceptNot = makeNodePreformattedExpr('~' + FS.l)
acceptPlus = makeNodePreformattedExpr(FS.l + ' + ' + FS.r)
acceptStar = makeNodePreformattedExpr(FS.l + ' * ' + FS.r)
acceptUnaryMinus = makeNodePreformattedExpr('-' + FS.l)
acceptUnaryPlus = makeNodePreformattedExpr('+' + FS.l)
def makeAcceptPrePost(suffix, pre):
""" Make an accept method for pre- and post- assignment expressions. """
def acceptPrePost(self, node, memo):
factory = self.factory.expr
if node.withinExpr:
name = node.firstChildOfType(tokens.IDENT).text
handler = self.configHandler('VariableNaming')
rename = handler(name)
block = self.parents(lambda x:x.isMethod).next()
if pre:
left = name
else:
left = rename
block.adopt(factory(fs=FS.l+' = '+FS.r, left=rename, right=name))
self.left = factory(parent=self, fs=FS.l, left=left)
block.adopt(factory(fs=FS.l + suffix, left=name))
else:
self.fs = FS.l + suffix
self.left, self.right = vs = factory(parent=self), factory(parent=self)
self.zipWalk(node.children, vs, memo)
return acceptPrePost
acceptPostInc = makeAcceptPrePost(' += 1', pre=False)
acceptPreInc = makeAcceptPrePost(' += 1', pre=True)
acceptPostDec = makeAcceptPrePost(' -= 1', pre=False)
acceptPreDec = makeAcceptPrePost(' -= 1', pre=True)
def acceptBitShiftRight(self, node, memo):
""" Accept and process a bit shift right expression. """
factory = self.factory.expr
self.fs = 'bsr(' + FS.l + ', ' + FS.r + ')'
self.left, self.right = visitors = factory(parent=self), factory()
self.zipWalk(node.children, visitors, memo)
module = self.parents(lambda x:x.isModule).next()
module.needsBsrFunc = True
def acceptBitShiftRightAssign(self, node, memo):
""" Accept and process a bit shift right expression with assignment. """
factory = self.factory.expr
self.fs = FS.l + ' = bsr(' + FS.l + ', ' + FS.r + ')'
self.left, self.right = visitors = factory(parent=self), factory()
self.zipWalk(node.children, visitors, memo)
module = self.parents(lambda x:x.isModule).next()
module.needsBsrFunc = True
def acceptClassConstructorCall(self, node, memo):
""" Accept and process a class constructor call. """
self.acceptMethodCall(node, memo)
typeIdent = node.firstChildOfType(tokens.QUALIFIED_TYPE_IDENT)
if typeIdent and typeIdent.children:
names = [self.altIdent(child.text) for child in typeIdent.children]
self.left = '.'.join(names)
def acceptDot(self, node, memo):
""" Accept and process a dotted expression. """
expr = self.factory.expr
self.fs = FS.l + '.' + FS.r
self.left, self.right = visitors = expr(parent=self), expr()
self.zipWalk(node.children, visitors, memo)
def acceptExpr(self, node, memo):
""" Create a new expression within this one. """
return self.pushRight()
def acceptIdent(self, node, memo):
""" Accept and process an ident expression. """
self.left = self.altIdent(node.text)
def acceptInstanceof(self, node, memo):
""" Accept and process an instanceof expression. """
self.fs = 'isinstance({right}, ({left}, ))'
self.right = self.factory.expr(parent=self)
self.right.walk(node.firstChildOfType(tokens.IDENT), memo)
self.left = self.factory.expr(parent=self)
self.left.walk(node.firstChildOfType(tokens.TYPE), memo)
def acceptMethodCall(self, node, memo):
""" Accept and process a method call. """
# NB: this creates one too many expression levels.
expr = self.factory.expr
self.fs = FS.l + '(' + FS.r + ')'
self.left = expr(parent=self)
self.left.walk(node.firstChild(), memo)
children = node.firstChildOfType(tokens.ARGUMENT_LIST).children
self.right = arg = expr(parent=self)
for child in children:
fs = FS.r + (', ' if child is not children[-1] else '')
arg.left = expr(fs=fs, parent=self)
arg.left.walk(child, memo)
arg.right = arg = expr(parent=self)
skipParensParents = (
tokens.IF,
tokens.WHILE,
tokens.SWITCH,
tokens.SYNCHRONIZED,
)
def acceptParentesizedExpr(self, node, memo):
if node.parent.type not in self.skipParensParents:
right = self.pushRight()
right.fs = '(' + FS.lr + ')'
return right
return self
def acceptThisConstructorCall(self, node, memo):
""" Accept and process a 'this(...)' constructor call. """
self.acceptMethodCall(node, memo)
self.left = 'self.__init__'
def acceptStaticArrayCreator(self, node, memo):
""" Accept and process a static array expression. """
self.right = self.factory.expr(fs='[None]*{left}')
self.right.left = self.factory.expr()
self.right.left.walk(node.firstChildOfType(tokens.EXPR), memo)
def acceptSuper(self, node, memo):
""" Accept and process a super expression. """
cls = self.parents(lambda c:c.isClass).next()
self.right = self.factory.expr(fs='super({name}, self)'.format(name=cls.name))
def acceptSuperConstructorCall(self, node, memo):
""" Accept and process a super constructor call. """
cls = self.parents(lambda c:c.isClass).next()
fs = 'super(' + FS.l + ', self).__init__(' + FS.r + ')'
self.right = self.factory.expr(fs=fs, left=cls.name)
return self.right
def acceptThis(self, node, memo):
""" Accept and process a 'this' expression. """
self.pushRight('self')
def acceptQuestion(self, node, memo):
""" Accept and process a terinary expression. """
expr = self.factory.expr
self.fs = FS.l + ' if ' + FS.r
self.left = expr(parent=self)
self.right = expr(fs=FS.l+' else '+FS.r, parent=self)
self.right.left = expr(parent=self.right)
self.right.right = expr(parent=self.right)
visitors = (self.right.left, self.left, self.right.right)
self.zipWalk(node.children, visitors, memo)
def acceptVoid(self, node, memo):
""" Accept and process a the void half of a void.class expression. """
self.pushRight('None')
def acceptClass(self, node, memo):
""" Accept and process a .class expression. """
self.pushRight('__class__')
def pushRight(self, value=''):
""" Creates a new right expression, sets it, and returns it. """
self.right = self.factory.expr(left=value, parent=self)
return self.right
class Comment(Expression):
""" Comment -> implemented for type building in __init__.py. """
class Statement(MethodContent):
""" Statement -> accept AST branches for statement objects. """