mirror of https://github.com/evilhero/mylar
642 lines
22 KiB
Python
642 lines
22 KiB
Python
from __future__ import unicode_literals
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from .pyjsparserdata import *
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from .friendly_nodes import *
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import random
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import six
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if six.PY3:
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from functools import reduce
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xrange = range
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unicode = str
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# number of characters above which expression will be split to multiple lines in order to avoid python parser stack overflow
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# still experimental so I suggest to set it to 400 in order to avoid common errors
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# set it to smaller value only if you have problems with parser stack overflow
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LINE_LEN_LIMIT = 400 # 200 # or any other value - the larger the smaller probability of errors :)
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class ForController:
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def __init__(self):
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self.inside = [False]
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self.update = ''
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def enter_for(self, update):
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self.inside.append(True)
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self.update = update
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def leave_for(self):
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self.inside.pop()
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def enter_other(self):
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self.inside.append(False)
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def leave_other(self):
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self.inside.pop()
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def is_inside(self):
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return self.inside[-1]
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class InlineStack:
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NAME = 'PyJs_%s_%d_'
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def __init__(self):
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self.reps = {}
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self.names = []
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def inject_inlines(self, source):
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for lval in self.names: # first in first out! Its important by the way
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source = inject_before_lval(source, lval, self.reps[lval])
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return source
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def require(self, typ):
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name = self.NAME % (typ, len(self.names))
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self.names.append(name)
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return name
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def define(self, name, val):
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self.reps[name] = val
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def reset(self):
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self.rel = {}
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self.names = []
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class ContextStack:
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def __init__(self):
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self.to_register = set([])
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self.to_define = {}
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def reset(self):
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self.to_register = set([])
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self.to_define = {}
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def register(self, var):
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self.to_register.add(var)
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def define(self, name, code):
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self.to_define[name] = code
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self.register(name)
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def get_code(self):
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code = 'var.registers([%s])\n' % ', '.join(repr(e) for e in self.to_register)
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for name, func_code in six.iteritems(self.to_define):
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code += func_code
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return code
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def clean_stacks():
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global Context, inline_stack
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Context = ContextStack()
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inline_stack = InlineStack()
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def to_key(literal_or_identifier):
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''' returns string representation of this object'''
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if literal_or_identifier['type']=='Identifier':
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return literal_or_identifier['name']
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elif literal_or_identifier['type']=='Literal':
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k = literal_or_identifier['value']
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if isinstance(k, float):
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return unicode(float_repr(k))
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elif 'regex' in literal_or_identifier:
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return compose_regex(k)
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elif isinstance(k, bool):
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return 'true' if k else 'false'
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elif k is None:
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return 'null'
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else:
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return unicode(k)
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def trans(ele, standard=False):
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"""Translates esprima syntax tree to python by delegating to appropriate translating node"""
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try:
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node = globals().get(ele['type'])
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if not node:
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raise NotImplementedError('%s is not supported!' % ele['type'])
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if standard:
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node = node.__dict__['standard'] if 'standard' in node.__dict__ else node
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return node(**ele)
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except:
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#print ele
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raise
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def limited(func):
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'''Decorator limiting resulting line length in order to avoid python parser stack overflow -
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If expression longer than LINE_LEN_LIMIT characters then it will be moved to upper line
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USE ONLY ON EXPRESSIONS!!! '''
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def f(standard=False, **args):
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insert_pos = len(inline_stack.names) # in case line is longer than limit we will have to insert the lval at current position
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# this is because calling func will change inline_stack.
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# we cant use inline_stack.require here because we dont know whether line overflows yet
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res = func(**args)
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if len(res)>LINE_LEN_LIMIT:
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name = inline_stack.require('LONG')
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inline_stack.names.pop()
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inline_stack.names.insert(insert_pos, name)
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res = 'def %s(var=var):\n return %s\n' % (name, res)
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inline_stack.define(name, res)
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return name+'()'
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else:
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return res
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f.__dict__['standard'] = func
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return f
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# ==== IDENTIFIERS AND LITERALS =======
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inf = float('inf')
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def Literal(type, value, raw, regex=None):
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if regex: # regex
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return 'JsRegExp(%s)' % repr(compose_regex(value))
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elif value is None: # null
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return 'var.get(u"null")'
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# Todo template
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# String, Bool, Float
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return 'Js(%s)' % repr(value) if value!=inf else 'Js(float("inf"))'
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def Identifier(type, name):
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return 'var.get(%s)' % repr(name)
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@limited
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def MemberExpression(type, computed, object, property):
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far_left = trans(object)
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if computed: # obj[prop] type accessor
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# may be literal which is the same in every case so we can save some time on conversion
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if property['type'] == 'Literal':
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prop = repr(to_key(property))
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else: # worst case
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prop = trans(property)
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else: # always the same since not computed (obj.prop accessor)
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prop = repr(to_key(property))
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return far_left + '.get(%s)' % prop
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def ThisExpression(type):
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return 'var.get(u"this")'
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@limited
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def CallExpression(type, callee, arguments):
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arguments = [trans(e) for e in arguments]
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if callee['type']=='MemberExpression':
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far_left = trans(callee['object'])
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if callee['computed']: # obj[prop] type accessor
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# may be literal which is the same in every case so we can save some time on conversion
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if callee['property']['type'] == 'Literal':
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prop = repr(to_key(callee['property']))
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else: # worst case
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prop = trans(callee['property']) # its not a string literal! so no repr
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else: # always the same since not computed (obj.prop accessor)
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prop = repr(to_key(callee['property']))
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arguments.insert(0, prop)
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return far_left + '.callprop(%s)' % ', '.join(arguments)
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else: # standard call
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return trans(callee) + '(%s)' % ', '.join(arguments)
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# ========== ARRAYS ============
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def ArrayExpression(type, elements): # todo fix null inside problem
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return 'Js([%s])' % ', '.join(trans(e) if e else 'None' for e in elements)
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# ========== OBJECTS =============
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def ObjectExpression(type, properties):
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name = inline_stack.require('Object')
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elems = []
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after = ''
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for p in properties:
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if p['kind']=='init':
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elems.append('%s:%s' % Property(**p))
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elif p['kind']=='set':
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k, setter = Property(**p) # setter is just a lval referring to that function, it will be defined in InlineStack automatically
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after += '%s.define_own_property(%s, {"set":%s, "configurable":True, "enumerable":True})\n' % (name, k, setter)
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elif p['kind']=='get':
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k, getter = Property(**p)
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after += '%s.define_own_property(%s, {"get":%s, "configurable":True, "enumerable":True})\n' % (name, k, getter)
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else:
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raise RuntimeError('Unexpected object propery kind')
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obj = '%s = Js({%s})\n' % (name, ','.join(elems))
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inline_stack.define(name, obj+after)
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return name
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def Property(type, kind, key, computed, value, method, shorthand):
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if shorthand or computed:
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raise NotImplementedError('Shorthand and Computed properties not implemented!')
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k = to_key(key)
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if k is None:
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raise SyntaxError('Invalid key in dictionary! Or bug in Js2Py')
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v = trans(value)
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return repr(k), v
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# ========== EXPRESSIONS ============
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@limited
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def UnaryExpression(type, operator, argument, prefix):
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a = trans(argument, standard=True) # unary involve some complex operations so we cant use line shorteners here
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if operator=='delete':
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if argument['type'] in {'Identifier', 'MemberExpression'}:
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# means that operation is valid
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return js_delete(a)
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return 'PyJsComma(%s, Js(True))' % a # otherwise not valid, just perform expression and return true.
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elif operator=='typeof':
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return js_typeof(a)
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return UNARY[operator](a)
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@limited
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def BinaryExpression(type, operator, left, right):
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a = trans(left)
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b = trans(right)
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# delegate to our friends
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return BINARY[operator](a,b)
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@limited
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def UpdateExpression(type, operator, argument, prefix):
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a = trans(argument, standard=True) # also complex operation involving parsing of the result so no line length reducing here
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return js_postfix(a, operator=='++', not prefix)
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@limited
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def AssignmentExpression(type, operator, left, right):
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operator = operator[:-1]
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if left['type']=='Identifier':
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if operator:
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return 'var.put(%s, %s, %s)' % (repr(to_key(left)), trans(right), repr(operator))
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else:
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return 'var.put(%s, %s)' % (repr(to_key(left)), trans(right))
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elif left['type']=='MemberExpression':
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far_left = trans(left['object'])
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if left['computed']: # obj[prop] type accessor
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# may be literal which is the same in every case so we can save some time on conversion
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if left['property']['type'] == 'Literal':
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prop = repr(to_key(left['property']))
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else: # worst case
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prop = trans(left['property']) # its not a string literal! so no repr
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else: # always the same since not computed (obj.prop accessor)
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prop = repr(to_key(left['property']))
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if operator:
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return far_left + '.put(%s, %s, %s)' % (prop, trans(right), repr(operator))
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else:
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return far_left + '.put(%s, %s)' % (prop, trans(right))
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else:
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raise SyntaxError('Invalid left hand side in assignment!')
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six
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@limited
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def SequenceExpression(type, expressions):
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return reduce(js_comma, (trans(e) for e in expressions))
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@limited
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def NewExpression(type, callee, arguments):
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return trans(callee) + '.create(%s)' % ', '.join(trans(e) for e in arguments)
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@limited
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def ConditionalExpression(type, test, consequent, alternate): # caused plenty of problems in my home-made translator :)
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return '(%s if %s else %s)' % (trans(consequent), trans(test), trans(alternate))
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# =========== STATEMENTS =============
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def BlockStatement(type, body):
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return StatementList(body) # never returns empty string! In the worst case returns pass\n
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def ExpressionStatement(type, expression):
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return trans(expression) + '\n' # end expression space with new line
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def BreakStatement(type, label):
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if label:
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return 'raise %s("Breaked")\n' % (get_break_label(label['name']))
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else:
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return 'break\n'
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def ContinueStatement(type, label):
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if label:
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return 'raise %s("Continued")\n' % (get_continue_label(label['name']))
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else:
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return 'continue\n'
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def ReturnStatement(type, argument):
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return 'return %s\n' % (trans(argument) if argument else "var.get('undefined')")
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def EmptyStatement(type):
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return 'pass\n'
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def DebuggerStatement(type):
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return 'pass\n'
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def DoWhileStatement(type, body, test):
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inside = trans(body) + 'if not %s:\n' % trans(test) + indent('break\n')
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result = 'while 1:\n' + indent(inside)
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return result
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def ForStatement(type, init, test, update, body):
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update = indent(trans(update)) if update else ''
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init = trans(init) if init else ''
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if not init.endswith('\n'):
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init += '\n'
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test = trans(test) if test else '1'
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if not update:
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result = '#for JS loop\n%swhile %s:\n%s%s\n' % (init, test, indent(trans(body)), update)
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else:
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result = '#for JS loop\n%swhile %s:\n' % (init, test)
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body = 'try:\n%sfinally:\n %s\n' % (indent(trans(body)), update)
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result += indent(body)
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return result
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def ForInStatement(type, left, right, body, each):
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res = 'for PyJsTemp in %s:\n' % trans(right)
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if left['type']=="VariableDeclaration":
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addon = trans(left) # make sure variable is registered
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if addon != 'pass\n':
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res = addon + res # we have to execute this expression :(
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# now extract the name
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try:
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name = left['declarations'][0]['id']['name']
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except:
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raise RuntimeError('Unusual ForIn loop')
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elif left['type']=='Identifier':
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name = left['name']
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else:
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raise RuntimeError('Unusual ForIn loop')
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res += indent('var.put(%s, PyJsTemp)\n' % repr(name) + trans(body))
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return res
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def IfStatement(type, test, consequent, alternate):
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# NOTE we cannot do elif because function definition inside elif statement would not be possible!
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IF = 'if %s:\n' % trans(test)
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IF += indent(trans(consequent))
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if not alternate:
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return IF
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ELSE = 'else:\n' + indent(trans(alternate))
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return IF + ELSE
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def LabeledStatement(type, label, body):
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# todo consider using smarter approach!
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inside = trans(body)
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defs = ''
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if inside.startswith('while ') or inside.startswith('for ') or inside.startswith('#for'):
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# we have to add contine label as well...
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# 3 or 1 since #for loop type has more lines before real for.
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sep = 1 if not inside.startswith('#for') else 3
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cont_label = get_continue_label(label['name'])
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temp = inside.split('\n')
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injected = 'try:\n'+'\n'.join(temp[sep:])
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injected += 'except %s:\n pass\n'%cont_label
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inside = '\n'.join(temp[:sep])+'\n'+indent(injected)
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defs += 'class %s(Exception): pass\n'%cont_label
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break_label = get_break_label(label['name'])
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inside = 'try:\n%sexcept %s:\n pass\n'% (indent(inside), break_label)
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defs += 'class %s(Exception): pass\n'%break_label
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return defs + inside
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def StatementList(lis):
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if lis: # ensure we don't return empty string because it may ruin indentation!
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code = ''.join(trans(e) for e in lis)
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return code if code else 'pass\n'
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else:
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return 'pass\n'
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def PyimportStatement(type, imp):
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lib = imp['name']
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jlib = 'PyImport_%s' % lib
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code = 'import %s as %s\n' % (lib, jlib)
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#check whether valid lib name...
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try:
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compile(code, '', 'exec')
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except:
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raise SyntaxError('Invalid Python module name (%s) in pyimport statement'%lib)
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# var.pyimport will handle module conversion to PyJs object
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code += 'var.pyimport(%s, %s)\n' % (repr(lib), jlib)
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return code
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def SwitchStatement(type, discriminant, cases):
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#TODO there will be a problem with continue in a switch statement.... FIX IT
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code = 'while 1:\n' + indent('SWITCHED = False\nCONDITION = (%s)\n')
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code = code % trans(discriminant)
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for case in cases:
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case_code = None
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if case['test']: # case (x):
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case_code = 'if SWITCHED or PyJsStrictEq(CONDITION, %s):\n' % (trans(case['test']))
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else: # default:
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case_code = 'if True:\n'
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case_code += indent('SWITCHED = True\n')
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case_code += indent(StatementList(case['consequent']))
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# one more indent for whole
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code += indent(case_code)
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# prevent infinite loop and sort out nested switch...
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code += indent('SWITCHED = True\nbreak\n')
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return code
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def ThrowStatement(type, argument):
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return 'PyJsTempException = JsToPyException(%s)\nraise PyJsTempException\n' % trans(argument)
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def TryStatement(type, block, handler, handlers, guardedHandlers, finalizer):
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result = 'try:\n%s' % indent(trans(block))
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# complicated catch statement...
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if handler:
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identifier = handler['param']['name']
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holder = 'PyJsHolder_%s_%d'%(to_hex(identifier), random.randrange(1e8))
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identifier = repr(identifier)
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result += 'except PyJsException as PyJsTempException:\n'
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# fill in except ( catch ) block and remember to recover holder variable to its previous state
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result += indent(TRY_CATCH.replace('HOLDER', holder).replace('NAME', identifier).replace('BLOCK', indent(trans(handler['body']))))
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# translate finally statement if present
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if finalizer:
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result += 'finally:\n%s' % indent(trans(finalizer))
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return result
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def LexicalDeclaration(type, declarations, kind):
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raise NotImplementedError('let and const not implemented yet but they will be soon! Check github for updates.')
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def VariableDeclarator(type, id, init):
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name = id['name']
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# register the name if not already registered
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Context.register(name)
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if init:
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return 'var.put(%s, %s)\n' % (repr(name), trans(init))
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return ''
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def VariableDeclaration(type, declarations, kind):
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code = ''.join(trans(d) for d in declarations)
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return code if code else 'pass\n'
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def WhileStatement(type, test, body):
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result = 'while %s:\n'%trans(test) + indent(trans(body))
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return result
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def WithStatement(type, object, body):
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raise NotImplementedError('With statement not implemented!')
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def Program(type, body):
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inline_stack.reset()
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code = ''.join(trans(e) for e in body)
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# here add hoisted elements (register variables and define functions)
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code = Context.get_code() + code
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# replace all inline variables
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code = inline_stack.inject_inlines(code)
|
|
return code
|
|
|
|
|
|
|
|
# ======== FUNCTIONS ============
|
|
|
|
def FunctionDeclaration(type, id, params, defaults, body, generator, expression):
|
|
if generator:
|
|
raise NotImplementedError('Generators not supported')
|
|
if defaults:
|
|
raise NotImplementedError('Defaults not supported')
|
|
if not id:
|
|
return FunctionExpression(type, id, params, defaults, body, generator, expression)
|
|
JsName = id['name']
|
|
PyName = 'PyJsHoisted_%s_' % JsName
|
|
PyName = PyName if is_valid_py_name(PyName) else 'PyJsHoistedNonPyName'
|
|
# this is quite complicated
|
|
global Context
|
|
previous_context = Context
|
|
# change context to the context of this function
|
|
Context = ContextStack()
|
|
# translate body within current context
|
|
code = trans(body)
|
|
# get arg names
|
|
vars = [v['name'] for v in params]
|
|
# args are automaticaly registered variables
|
|
Context.to_register.update(vars)
|
|
# add all hoisted elements inside function
|
|
code = Context.get_code() + code
|
|
# check whether args are valid python names:
|
|
used_vars = []
|
|
for v in vars:
|
|
if is_valid_py_name(v):
|
|
used_vars.append(v)
|
|
else: # invalid arg in python, for example $, replace with alternatice arg
|
|
used_vars.append('PyJsArg_%s_' % to_hex(v))
|
|
header = '@Js\n'
|
|
header+= 'def %s(%sthis, arguments, var=var):\n' % (PyName, ', '.join(used_vars) +(', ' if vars else ''))
|
|
# transfer names from Py scope to Js scope
|
|
arg_map = dict(zip(vars, used_vars))
|
|
arg_map.update({'this':'this', 'arguments':'arguments'})
|
|
arg_conv = 'var = Scope({%s}, var)\n' % ', '.join(repr(k)+':'+v for k,v in six.iteritems(arg_map))
|
|
# and finally set the name of the function to its real name:
|
|
footer = '%s.func_name = %s\n' % (PyName, repr(JsName))
|
|
footer+= 'var.put(%s, %s)\n' % (repr(JsName), PyName)
|
|
whole_code = header + indent(arg_conv+code) + footer
|
|
# restore context
|
|
Context = previous_context
|
|
# define in upper context
|
|
Context.define(JsName, whole_code)
|
|
return 'pass\n'
|
|
|
|
|
|
def FunctionExpression(type, id, params, defaults, body, generator, expression):
|
|
if generator:
|
|
raise NotImplementedError('Generators not supported')
|
|
if defaults:
|
|
raise NotImplementedError('Defaults not supported')
|
|
JsName = id['name'] if id else 'anonymous'
|
|
if not is_valid_py_name(JsName):
|
|
ScriptName = 'InlineNonPyName'
|
|
else:
|
|
ScriptName = JsName
|
|
PyName = inline_stack.require(ScriptName) # this is unique
|
|
|
|
# again quite complicated
|
|
global Context
|
|
previous_context = Context
|
|
# change context to the context of this function
|
|
Context = ContextStack()
|
|
# translate body within current context
|
|
code = trans(body)
|
|
# get arg names
|
|
vars = [v['name'] for v in params]
|
|
# args are automaticaly registered variables
|
|
Context.to_register.update(vars)
|
|
# add all hoisted elements inside function
|
|
code = Context.get_code() + code
|
|
# check whether args are valid python names:
|
|
used_vars = []
|
|
for v in vars:
|
|
if is_valid_py_name(v):
|
|
used_vars.append(v)
|
|
else: # invalid arg in python, for example $, replace with alternatice arg
|
|
used_vars.append('PyJsArg_%s_' % to_hex(v))
|
|
header = '@Js\n'
|
|
header+= 'def %s(%sthis, arguments, var=var):\n' % (PyName, ', '.join(used_vars) +(', ' if vars else ''))
|
|
# transfer names from Py scope to Js scope
|
|
arg_map = dict(zip(vars, used_vars))
|
|
arg_map.update({'this':'this', 'arguments':'arguments'})
|
|
if id: # make self available from inside...
|
|
if id['name'] not in arg_map:
|
|
arg_map[id['name']] = PyName
|
|
arg_conv = 'var = Scope({%s}, var)\n' % ', '.join(repr(k)+':'+v for k,v in six.iteritems(arg_map))
|
|
# and finally set the name of the function to its real name:
|
|
footer = '%s._set_name(%s)\n' % (PyName, repr(JsName))
|
|
whole_code = header + indent(arg_conv+code) + footer
|
|
# restore context
|
|
Context = previous_context
|
|
# define in upper context
|
|
inline_stack.define(PyName, whole_code)
|
|
return PyName
|
|
|
|
|
|
LogicalExpression = BinaryExpression
|
|
PostfixExpression = UpdateExpression
|
|
|
|
clean_stacks()
|
|
|
|
if __name__=='__main__':
|
|
import codecs
|
|
import time
|
|
import pyjsparser
|
|
|
|
c = None#'''`ijfdij`'''
|
|
if not c:
|
|
with codecs.open("esp.js", "r", "utf-8") as f:
|
|
c = f.read()
|
|
|
|
print('Started')
|
|
t = time.time()
|
|
res = trans(pyjsparser.PyJsParser().parse(c))
|
|
dt = time.time() - t+ 0.000000001
|
|
print('Translated everyting in', round(dt,5), 'seconds.')
|
|
print('Thats %d characters per second' % int(len(c)/dt))
|
|
with open('res.py', 'w') as f:
|
|
f.write(res)
|
|
|