def func_super(self, type_, inst):
self.visit(
ast_call(
ast.FunctionDef(
'',
ast.arguments(
[ast_store('p'), ast_store('i')], None, None, []),
[
ast.FunctionDef('tmp', ast.arguments(
[], None, None, []), [
ast.Expr(
ast_call(ast_load('this.__bind__'),
ast_load('i'))),
], []),
ast.Assign([ast_load('tmp.prototype')], ast_load('p')),
ast.Return(ast_call(
ast_load('new'),
ast_load('tmp'),
))
], []),
ast.Attribute(
ast.Subscript(
ast_load('self.__mro__'),
ast.Index(
ast.BinOp(
ast_call(
ast_load('self.__mro__.indexOf'),
type_,
), ast.Sub(), ast.Num(1))), ast.Load()),
'prototype', ast.Load()),
inst,
))
def visit_Call(self, node):
if node.keywords:
raise Exception('keyword arguments are not supported')
if node.kwargs is not None:
raise Exception('kwargs is not supported')
if isinstance(node.func, _ast.Name):
func = getattr(self, 'func_%s' % node.func.id, None)
if func is not None:
# noinspection PyCallingNonCallable
return func(*node.args)
if not node.starargs:
self.visit(node.func)
self.group(node.args, infix=', ')
else:
# Rewrite the call without starargs using apply.
if isinstance(node.func, _ast.Attribute):
this = node.func.value
else:
this = ast_load('this')
if not node.args:
args = node.starargs
else:
args = ast_call(
ast.Attribute(ast.List(node.args, ast.Load()), 'concat',
ast.Load()), node.starargs)
self.visit(
ast_call(
ast.Attribute(node.func, 'apply', ast.Load()),
this,
args,
))
def init_module(self, module_path):
for i in range(len(module_path)):
self.load_module(module_path[:i + 1])
return ast_call(ast_call(ast_load('JS'), ast.Str('__import__')),
ast_call(ast_load('JS'), ast.Str('__module__')),
ast.Str('.'.join(module_path)))
def CmpOp_In(self, left, comparator):
self.visit(ast_call(
ast.FunctionDef(
'',
ast.arguments([ast_load('l'), ast_load('c')], None, None, []),
[
ast.Return(
ast.IfExp(
ast_call(
ast_load('Array.isArray'),
ast_load('c'),
),
ast.Compare(
ast_call(
ast_load('Array.prototype.indexOf.call'),
ast_load('c'),
ast_load('l'),
),
[ast.Gt()],
[ast.Num(-1)]
),
ast_call(
ast_load('JS'),
ast.Str("l in c"),
)
)
)
],
[]
),
left,
comparator
))
def init_module(self, module_path):
for i in range(len(module_path)):
self.load_module(module_path[:i + 1])
return ast_call(
ast_call(ast_load('JS'), ast.Str('__import__')),
ast_call(ast_load('JS'), ast.Str('__module__')),
ast.Str('.'.join(module_path))
)
def visit_TryExcept(self, node):
if node.orelse:
raise NotImplementedError('Try-except else handler not implemented')
self.indent()
self.output('try')
self.block(node.body, context=BlockContext(self.stack[-1]))
self.output(' catch($e) ')
self.push(BlockContext(self.stack[-1]))
if_start = None
if_end = None
for handler in node.handlers:
if handler.type is not None:
if handler.name is not None:
body = handler.body[:]
body.insert(0, ast.Assign(
[handler.name],
ast_call(ast_load('JS'), ast.Str('$e'))
))
else:
body = handler.body
types = [handler.type] if isinstance(handler.type, _ast.Name) else handler.type
conditions = [
ast_call(
ast_load('isinstance'),
ast_call(ast_load('JS'), ast.Str('$e')),
type_,
)
for type_ in types
]
_if = ast.If(
ast.BoolOp(ast.Or(), conditions),
body,
[]
)
if if_start is None:
if_start = if_end = _if
else:
if_end.orelse, if_end = [_if], _if
else:
if handler is not node.handlers[-1]:
raise SyntaxError("default 'except:' must be last")
if if_start is None:
self.block(handler.body)
else:
if_end.orelse = handler.body
if if_start is not None:
self.visit(if_start)
self.pop()
self.output('\n')
def visit_TryExcept(self, node):
if node.orelse:
raise NotImplementedError('Try-except else handler not implemented')
self.indent()
self.output('try')
self.block(node.body, context=BlockContext(self.stack[-1]))
self.output(' catch($e) ')
self.push(BlockContext(self.stack[-1]))
if_start = None
if_end = None
for handler in node.handlers:
if handler.type is not None:
if handler.name is not None:
body = handler.body[:]
body.insert(0, ast.Assign(
[handler.name],
ast_call(ast_load('JS'), ast.Str('$e'))
))
else:
body = handler.body
types = [handler.type] if isinstance(handler.type, _ast.Name) else handler.type
conditions = [
ast_call(
ast_load('isinstance'),
ast_call(ast_load('JS'), ast.Str('$e')),
type_,
)
for type_ in types
]
_if = ast.If(
ast.BoolOp(ast.Or(), conditions),
body,
[]
)
if if_start is None:
if_start = if_end = _if
else:
if_end.orelse, if_end = [_if], _if
else:
if handler is not node.handlers[-1]:
raise SyntaxError("default 'except:' must be last")
if if_start is None:
self.block(handler.body)
else:
if_end.orelse = handler.body
if if_start is not None:
self.visit(if_start)
self.pop()
self.output('\n')
def func_super(self, type_, inst):
self.visit(
ast_call(
ast.FunctionDef(
'',
ast.arguments([ast_store('p'), ast_store('i')], None, None, []),
[
ast.FunctionDef(
'tmp',
ast.arguments([], None, None, []),
[
ast.Expr(
ast_call(
ast_load('this.__bind__'),
ast_load('i')
)
),
],
[]
),
ast.Assign(
[ast_load('tmp.prototype')],
ast_load('p')
),
ast.Return(
ast_call(
ast_load('new'),
ast_load('tmp'),
)
)
],
[]
),
ast.Attribute(
ast.Subscript(
ast_load('self.__mro__'),
ast.Index(
ast.BinOp(
ast_call(
ast_load('self.__mro__.indexOf'),
type_,
),
ast.Sub(),
ast.Num(1)
)
),
ast.Load()
),
'prototype',
ast.Load()
),
inst,
)
)
def test_assign_expr_slice(self):
assert self.run(
[
ast.Assign(
[ast_store('test')],
ast.List([ast.Num(x) for x in range(10)], ast.Load())
),
ast.FunctionDef(
'f_test',
ast.arguments([], None, None, []),
[
ast.Return(ast_load('test')),
],
[]
),
ast.Assign(
[
ast.Subscript(
ast_call(ast_load('f_test')),
ast.Slice(ast.Num(2), ast.Num(8), None),
ast.Store()
),
],
ast.List([ast.Num(42), ast.Num(43)], ast.Load())
),
],
'test',
list
) == [0, 1, 42, 43, 8, 9]
def build_Assign_Destructuring(self, targets, value):
scope = self.stack[-1].scope
global_scope = scope.get_global_scope()
assignments = []
for target, i in zip(targets.elts, range(len(targets.elts))):
if isinstance(target, _ast.Name):
if scope.is_global(target.id):
global_scope.declare(target.id)
else:
scope.declare(target.id)
target = ast.Name(target.id, ast.Load())
assignments.append(
ast.Assign(
[target],
ast.Subscript(
ast_load('v'),
ast.Index(ast.Num(i)),
ast.Load()
)
)
)
return ast_call(
ast.FunctionDef(
'',
ast.arguments([ast_store('v')], None, None, []),
assignments + [
ast.Return(ast_load('v'))
],
[]
),
value
)
def visit_ImportFrom(self, node):
if node.level:
raise NotImplementedError('Relative imports are not supported')
module_path = node.module.split('.')
import_module = self.init_module(module_path)
if len(node.names) > 1 or node.names[0].name == '*':
self.visit(ast.Assign(
[ast_store('$t1')],
import_module
))
import_from = ast_load('$t1')
else:
import_from = import_module
if node.names[0].name == '*':
name = node.names[0]
if name.name == '*':
if self.stack[-1].scope.prefix != ['__module__']:
raise NotImplementedError('from x import * only implemented at module level')
self.visit(ast.For(
ast_store('$t2'),
import_from,
[
ast.Assign(
[
ast.Subscript(
ast_call(ast_load('JS'), ast.Str('__module__')),
ast.Index(ast_load('$t2')),
ast.Load()
)
],
ast.Subscript(
import_from,
ast.Index(ast_load('$t2')),
ast.Load(),
)
),
],
[]
))
else:
for name in node.names:
asname = name.asname if name.asname else name.name
self.visit(
ast.Assign(
[ast_store(asname)],
ast.Attribute(
import_from,
name.name,
ast.Load()
)
)
)
def visit_Print(self, node):
self.indent()
self.visit(
ast_call(
ast_load('console.log'),
*node.values
)
)
self.finish()
def visit_Call(self, node):
if node.keywords:
raise Exception('keyword arguments are not supported')
if node.kwargs is not None:
raise Exception('kwargs is not supported')
if isinstance(node.func, _ast.Name):
func = getattr(self, 'func_%s' % node.func.id, None)
if func is not None:
# noinspection PyCallingNonCallable
return func(*node.args)
if not node.starargs:
self.visit(node.func)
self.group(node.args, infix=', ')
else:
# Rewrite the call without starargs using apply.
if isinstance(node.func, _ast.Attribute):
this = node.func.value
else:
this = ast_load('this')
if not node.args:
args = node.starargs
else:
args = ast_call(
ast.Attribute(
ast.List(node.args, ast.Load()),
'concat',
ast.Load()
),
node.starargs
)
self.visit(
ast_call(
ast.Attribute(
node.func,
'apply',
ast.Load()
),
this,
args,
)
)
def visit_ListComp(self, node):
body = [ast.Expr(ast_call(ast_load('$$.push'), node.elt))]
for i, generator in reversed(
zip(range(len(node.generators)), node.generators)):
if not isinstance(generator.target, ast.Name):
raise TypeError('dereferencing assignment not supported')
if generator.ifs:
if len(generator.ifs) > 1:
cond = ast.BoolOp(ast.And(), generator.ifs)
else:
cond = generator.ifs[0]
body = [ast.If(cond, body, [])]
body = [
ast.Assign([ast_store('$$' + generator.target.id)],
generator.iter),
ast.For(
ast_store('$' + generator.target.id),
ast_call(
ast_load('range'), ast.Num(0),
ast.Attribute(ast_load('$$' + generator.target.id),
'length', ast.Load())),
[
ast.Assign(
[generator.target],
ast.Subscript(
ast_load('$$' + generator.target.id),
ast.Index(ast_load('$' + generator.target.id)),
ast.Load())),
] + body, [])
]
self.visit(
ast_call(
ast.FunctionDef('', ast.arguments([], None, None, []), [
ast.Assign([ast_store('$$')], ast.List([], ast.Load())),
] + body + [
ast.Return(ast_load('$$')),
], []), ))
def test_assign_expr_slice(self):
assert self.run([
ast.Assign([ast_store('test')],
ast.List([ast.Num(x) for x in range(10)], ast.Load())),
ast.FunctionDef('f_test', ast.arguments([], None, None, []), [
ast.Return(ast_load('test')),
], []),
ast.Assign([
ast.Subscript(ast_call(ast_load('f_test')),
ast.Slice(ast.Num(2), ast.Num(8), None),
ast.Store()),
], ast.List([ast.Num(42), ast.Num(43)], ast.Load())),
], 'test', list) == [0, 1, 42, 43, 8, 9]
def run(self, body, expression=None, converter=str):
self.v.block(body)
if not expression is None:
self.v.visit(
ast.Expr(
ast_call(ast_load('JS'), ast.Str(expression))
)
)
ctx = PyV8.JSContext()
with ctx:
js_body = str(self.v.stack[-1])
return converter(ctx.eval(js_body))
def visit_ImportFrom(self, node):
if node.level:
raise NotImplementedError('Relative imports are not supported')
module_path = node.module.split('.')
import_module = self.init_module(module_path)
if len(node.names) > 1 or node.names[0].name == '*':
self.visit(ast.Assign([ast_store('$t1')], import_module))
import_from = ast_load('$t1')
else:
import_from = import_module
if node.names[0].name == '*':
name = node.names[0]
if name.name == '*':
if self.stack[-1].scope.prefix != ['__module__']:
raise NotImplementedError(
'from x import * only implemented at module level')
self.visit(
ast.For(ast_store('$t2'), import_from, [
ast.Assign([
ast.Subscript(
ast_call(ast_load('JS'),
ast.Str('__module__')),
ast.Index(ast_load('$t2')), ast.Load())
],
ast.Subscript(
import_from,
ast.Index(ast_load('$t2')),
ast.Load(),
)),
], []))
else:
for name in node.names:
asname = name.asname if name.asname else name.name
self.visit(
ast.Assign([ast_store(asname)],
ast.Attribute(import_from, name.name,
ast.Load())))
def test_destructure(self):
assert self.run([
ast.Assign([ast_store('test2')],
ast_call(
ast.FunctionDef('', ast.arguments(
[], None, None, []), [
ast.Global(['test1']),
ast.Assign([
ast.List([
ast_store('test1'),
ast_store('test2'),
], ast.Store())
],
ast.List([
ast.Str('test1'),
ast.Str('test2'),
], ast.Load())),
ast.Return(ast_load('test2'))
], [])))
], 'test1 + "+" + test2') == 'test1+test2'
def test_destructure(self):
assert self.run(
[
ast.Assign(
[ast_store('test2')],
ast_call(
ast.FunctionDef(
'',
ast.arguments([], None, None, []),
[
ast.Global(['test1']),
ast.Assign(
[
ast.List(
[
ast_store('test1'),
ast_store('test2'),
],
ast.Store()
)
],
ast.List(
[
ast.Str('test1'),
ast.Str('test2'),
],
ast.Load()
)
),
ast.Return(ast_load('test2'))
],
[]
)
)
)
],
'test1 + "+" + test2'
) == 'test1+test2'
def visit_FunctionDef(self, node):
if node.name:
self.stack[-1].scope.declare(node.name)
args = [get_arg_id(arg) for arg in node.args.args]
if node.args.kwarg is not None:
raise Exception('**kwargs not supported')
func = FunctionContext(self.stack[-1], args)
self.push(func)
# Emit vararg
if node.args.vararg is not None:
self.visit(
ast.Assign([ast.Name(node.args.vararg, ast.Store())],
ast_call(
ast_load('Array.prototype.slice.call'),
ast.Name('arguments', ast.Load()),
ast.Num(len(args)),
)))
# Emit default arguments
def_args = node.args.defaults
for arg_name, arg_val in zip(args[-len(def_args):], def_args):
self.block([
ast.If(
ast.Compare(
ast_call(
ast.Name('type', ast.Load()),
ast.Name(arg_name, ast.Load()),
),
[
ast.Eq(),
],
[
ast.Str('undefined'),
],
),
[
ast.Assign([ast.Name(arg_name, ast.Store())], arg_val),
],
[],
)
])
# Emit function body
self.block(node.body)
body = ast_call(
ast_load('JS'),
ast.Str(str(self.stack.pop())),
)
for decorator in node.decorator_list:
body = ast_call(decorator, body)
if not node.name:
self.visit(body)
else:
self.visit(ast.Assign(
[ast_load(node.name)],
body,
))
def setUp(self):
self.c = ast_call(ast.Name('foo', ast.Load()))
def setUp(self):
self.c = ast_call(ast.Name('foo', ast.Load()), 'a', 'b', 'c')
def func_new(self, type_, *args):
self.output('(new ')
self.visit(ast_call(type_, *args))
self.output(')')
def visit_FunctionDef(self, node):
if node.name:
self.stack[-1].scope.declare(node.name)
args = [arg.id for arg in node.args.args]
if node.args.kwarg is not None:
raise Exception('**kwargs not supported')
func = FunctionContext(self.stack[-1], args)
self.push(func)
# Emit vararg
if node.args.vararg is not None:
self.visit(
ast.Assign(
[ast.Name(node.args.vararg, ast.Store())],
ast_call(
ast_load('Array.prototype.slice.call'),
ast.Name('arguments', ast.Load()),
ast.Num(len(args)),
)
)
)
# Emit default arguments
def_args = node.args.defaults
for arg_name, arg_val in zip(args[-len(def_args):], def_args):
self.block([
ast.If(
ast.Compare(
ast_call(
ast.Name('type', ast.Load()),
ast.Name(arg_name, ast.Load()),
),
[ast.Eq(), ],
[ast.Str('undefined'), ],
),
[
ast.Assign(
[ast.Name(arg_name, ast.Store())],
arg_val
),
],
[],
)
])
# Emit function body
self.block(node.body)
body = ast_call(
ast_load('JS'),
ast.Str(str(self.stack.pop())),
)
for decorator in node.decorator_list:
body = ast_call(
decorator,
body
)
if not node.name:
self.visit(body)
else:
self.visit(
ast.Assign(
[ast_load(node.name)],
body,
)
)
def visit_ListComp(self, node):
body = [
ast.Expr(
ast_call(
ast_load('$$.push'),
node.elt
)
)
]
for i, generator in reversed(zip(range(len(node.generators)), node.generators)):
if not isinstance(generator.target, ast.Name):
raise TypeError('dereferencing assignment not supported')
if generator.ifs:
if len(generator.ifs) > 1:
cond = ast.BoolOp(ast.And(), generator.ifs)
else:
cond = generator.ifs[0]
body = [
ast.If(
cond,
body,
[]
)
]
body = [
ast.Assign(
[ast_store('$$' + generator.target.id)],
generator.iter
),
ast.For(
ast_store('$' + generator.target.id),
ast_call(
ast_load('range'),
ast.Num(0),
ast.Attribute(
ast_load('$$' + generator.target.id),
'length',
ast.Load()
)
),
[
ast.Assign(
[generator.target],
ast.Subscript(
ast_load('$$' + generator.target.id),
ast.Index(ast_load('$' + generator.target.id)),
ast.Load()
)
),
] + body,
[]
)
]
self.visit(
ast_call(
ast.FunctionDef(
'',
ast.arguments(
[
], None, None, []
),
[
ast.Assign(
[
ast_store('$$')
],
ast.List(
[],
ast.Load()
)
),
] + body + [
ast.Return(ast_load('$$')),
],
[]
),
)
)
def visit_Print(self, node):
self.indent()
self.visit(ast_call(ast_load('console.log'), *node.values))
self.finish()
def setUp(self):
self.c = ast_call(ast.Name('foo', ast.Load()))
def BinOp_Pow(self, left, right):
pow_func = ast_load('Math.pow')
self.visit(ast_call(pow_func, left, right))
def setUp(self):
self.c = ast_call(ast.Name('foo', ast.Load()), 'a', 'b', 'c')
def BinOp_FloorDiv(self, left, right):
floor = ast_load('Math.floor')
self.visit(ast_call(floor, ast.BinOp(left, ast.Div(), right)))
def visit_ClassDef(self, node):
if len(node.bases) > 1:
raise Exception('Multiple inheritance not supported')
self.visit(FunctionDef(
node.name,
arguments([], None, None, []),
[
ast.If(
ast.UnaryOp(
ast.Not(),
ast_call(
ast_load('isinstance'),
ast_load('this'),
ast_load('arguments.callee'),
)
),
[
ast.Return(
ast_call(
ast_load('new'),
ast_load('arguments.callee'),
ast_load('arguments'),
)
)
],
[]
),
ast.Assign(
[ast_store('this.__class__')],
ast_load('arguments.callee')
),
ast.Expr(
ast_call(
ast_load('this.__bind__'),
ast_load('this'),
),
),
ast.If(
ast.Compare(
ast_call(
ast_load('type'),
ast_load('this.__init__'),
),
[ast.IsNot()],
[ast.Str('undefined')],
),
[
ast.Expr(
ast_call(
ast_load('this.__init__.apply'),
ast_load('this'),
ast.Subscript(
ast_load('arguments'),
ast.Index(ast.Num(0)),
ast.Load()
)
)
),
],
[]
)
],
[]
))
self.push(ClassContext(self.stack[-1], node.name))
scope = self.stack[-1].scope
if not node.bases:
scope.prefix.pop()
self.visit(
ast.Assign(
[ast_store('prototype')],
ast.Dict(
[
ast.Str('constructor'),
ast.Str('__mro__')
],
[
ast_load(node.name),
ast.List([ast_load(node.name)], ast.Load())
]
)
)
)
scope.prefix.append('prototype')
self.visit(
ast.Assign(
[ast_store('__bind__')],
FunctionDef(
'',
arguments([ast_load('self')], None, None, []),
[
ast.For(
ast_store('i'),
ast_load('this'),
[
ast.If(
ast.Compare(
ast_call(
ast_load('type'),
ast.Subscript(
ast_load('this'),
ast.Index(ast_load('i')),
ast.Load(),
)
),
[ast.Is()],
[ast.Str('function')]
),
[
ast.Assign(
[ast.Subscript(
ast_load('this'),
ast.Index(ast_load('i')),
ast.Store(),
)],
ast_call(
ast.Attribute(
ast.Subscript(
ast_load('this'),
ast.Index(ast_load('i')),
ast.Load(),
),
'bind',
ast.Load(),
),
ast_load('self'),
ast_load('self'),
)
),
],
[]
)
],
[]
),
],
[]
)
)
)
else:
base = node.bases[0]
self.visit(
ast.Assign(
[ast_store(node.name, 'prototype')],
ast_call(
FunctionDef(
'',
arguments([], None, None, []),
[
ast.Assign(
[ast_store('tmp')],
FunctionDef(
'',
arguments([], None, None, []),
[],
[]
)
),
ast.Assign(
[ast_store('tmp', 'prototype')],
ast.Attribute(base, 'prototype', ast.Load()),
),
ast.Return(
ast_call(
ast_load('new'),
ast_load('tmp'),
)
)
],
[]
),
)
)
)
self.visit(
ast.Assign(
[ast_store(node.name, 'prototype.constructor')],
ast_load(node.name)
)
)
self.visit(
ast.Assign(
[ast_store(node.name, 'prototype.__base__')],
base,
)
)
self.visit(
ast.Assign(
[ast_store(node.name, 'prototype.__mro__')],
ast_call(
ast_load(node.name, 'prototype.__mro__.concat'),
ast_load(node.name),
)
)
)
for stmt in node.body:
self.visit(stmt)
self.pop()
if node.decorator_list:
arg = ast_load(node.name)
for decorator in node.decorator_list:
arg = ast_call(decorator, arg)
self.visit(
ast.Assign(
[ast_store(node.name)],
arg
)
)
def build_Assign_Slice(self, target, value):
args = []
if target.slice.lower or target.slice.upper:
args.append(target.slice.lower or ast.Num(0))
if target.slice.upper:
args.append(target.slice.upper)
return ast_call(
ast.FunctionDef(
'',
ast.arguments(
[
ast_store('t'),
ast_store('v'),
ast_store('s'),
ast_store('e'),
], None, None, []
),
[
ast.Assign(
[ast_store('s')],
ast.IfExp(
ast.Compare(
ast_call(
ast_load('type'),
ast_load('s')
),
[ast.Eq()],
[ast.Str('undefined')],
),
ast.Num(0),
ast.IfExp(
ast.Compare(
ast_load('s'),
[ast.Lt()],
[ast.Num(0)],
),
ast.BinOp(
ast_load('s'),
ast.Add(),
ast_load('t.length')
),
ast_load('s')
)
)
),
ast.Assign(
[ast_store('e')],
ast.IfExp(
ast.Compare(
ast_call(
ast_load('type'),
ast_load('e')
),
[ast.Eq()],
[ast.Str('undefined')],
),
ast_load('t.length'),
ast.IfExp(
ast.Compare(
ast_load('e'),
[ast.Lt()],
[ast.Num(0)],
),
ast.BinOp(
ast_load('e'),
ast.Add(),
ast_load('t.length')
),
ast_load('e')
)
)
),
ast.Expr(
ast_call(
ast_load('Array.prototype.splice.apply'),
ast_load('t'),
ast_call(
ast.Attribute(
ast.List([
ast_load('s'),
ast.BinOp(
ast_load('e'),
ast.Sub(),
ast_load('s')
),
], ast.Load()),
'concat',
ast.Load(),
),
ast_load('v'),
)
)
),
ast.Return(ast_load('v')),
],
[]
),
target.value,
value,
*args
)
def func_new(self, type_, *args):
self.output('(new ')
self.visit(ast_call(type_, *args))
self.output(')')