def AssignmentExpression(self, operator, left, right, **kwargs):
operator = operator[:-1]
if left['type'] == 'MemberExpression':
self.emit(left['object'])
if left['computed']:
self.emit(left['property'])
self.emit(right)
if operator:
self.emit('STORE_MEMBER_OP', operator)
else:
self.emit('STORE_MEMBER')
else:
self.emit(right)
if operator:
self.emit('STORE_MEMBER_DOT_OP', left['property']['name'],
operator)
else:
self.emit('STORE_MEMBER_DOT', left['property']['name'])
elif left['type'] == 'Identifier':
if left['name'] in SPECIAL_IDENTIFIERS:
raise MakeError('SyntaxError',
'Invalid left-hand side in assignment')
self.emit(right)
if operator:
self.emit('STORE_OP', left['name'], operator)
else:
self.emit('STORE', left['name'])
else:
raise MakeError('SyntaxError',
'Invalid left-hand side in assignment')
def VariableDeclarator(self, id, init, **kwargs):
name = id['name']
if name in SPECIAL_IDENTIFIERS:
raise MakeError('Invalid left-hand side in assignment')
self.declared_vars.append(name)
if init is not None:
self.emit(init)
self.emit('STORE', name)
self.emit('POP')
def BreakStatement(self, label, **kwargs):
if label is None:
self.emit('JUMP', self.implicit_breaks[-1])
else:
label = label.get('name')
if label not in self.declared_break_labels:
raise MakeError('SyntaxError', 'Undefined label \'%s\'' % label)
else:
self.emit('JUMP', self.declared_break_labels[label])
def ForInStatement(self, left, right, body, **kwargs):
# prepare the needed labels
body_start_label = self.exe.get_new_label()
continue_label = self.exe.get_new_label()
break_label = self.exe.get_new_label()
# prepare the name
if left['type'] == 'VariableDeclaration':
if len(left['declarations']) != 1:
raise MakeError(
'SyntaxError',
' Invalid left-hand side in for-in loop: Must have a single binding.'
)
self.emit(left)
name = left['declarations'][0]['id']['name']
elif left['type'] == 'Identifier':
name = left['name']
else:
raise MakeError('SyntaxError',
'Invalid left-hand side in for-loop')
# prepare the iterable
self.emit(right)
# emit ForIn Opcode
self.emit('FOR_IN', name, body_start_label, continue_label,
break_label)
# a special continue position
self.emit('LABEL', continue_label)
self.emit('NOP')
self.emit('LABEL', body_start_label)
self.implicit_continues.append(continue_label)
self.implicit_breaks.append(break_label)
self.emit('LOAD_UNDEFINED')
self.emit(body)
self.implicit_continues.pop()
self.implicit_breaks.pop()
self.emit('NOP')
self.emit('LABEL', break_label)
self.emit('NOP')
def UpdateExpression(self, operator, argument, prefix, **kwargs):
incr = int(operator == "++")
post = int(not prefix)
if argument['type'] == 'MemberExpression':
if argument['computed']:
self.emit(argument['object'])
self.emit(argument['property'])
self.emit('POSTFIX_MEMBER', post, incr)
else:
self.emit(argument['object'])
name = to_key(argument['property'])
self.emit('POSTFIX_MEMBER_DOT', post, incr, name)
elif argument['type'] == 'Identifier':
name = to_key(argument)
self.emit('POSTFIX', post, incr, name)
else:
raise MakeError('SyntaxError', 'Invalid left-hand side in assignment')
def UnaryExpression(self, operator, argument, **kwargs):
if operator == 'typeof' and argument['type']=='Identifier': # todo fix typeof
self.emit('TYPEOF', argument['name'])
elif operator == 'delete':
if argument['type'] == 'MemberExpression':
self.emit(argument['object'])
if argument['property']['type'] == 'Identifier':
self.emit('LOAD_STRING', unicode(argument['property']['name']))
else:
self.emit(argument['property'])
self.emit('DELETE_MEMBER')
elif argument['type'] == 'Identifier':
self.emit('DELETE', argument['name'])
else:
self.emit('LOAD_BOOLEAN', 1)
elif operator in UNARY_OPERATIONS:
self.emit(argument)
self.emit('UNARY_OP', operator)
else:
raise MakeError('SyntaxError', 'Unknown unary operator %s' % operator)
import pyjsparser
from space import Space
import fill_space
from byte_trans import ByteCodeGenerator
from code import Code
from simplex import MakeError
import sys
sys.setrecursionlimit(100000)
pyjsparser.parser.ENABLE_JS2PY_ERRORS = lambda msg: MakeError(u'SyntaxError', unicode(msg))
def eval_js_vm(js):
a = ByteCodeGenerator(Code())
s = Space()
a.exe.space = s
s.exe = a.exe
d = pyjsparser.parse(js)
a.emit(d)
fill_space.fill_space(s, a)
# print a.exe.tape
a.exe.compile()
return a.exe.run(a.exe.space.GlobalObj)