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bazarr/libs/js2py/internals/constructors/jsfunction.py

77 lines
2.6 KiB

from ..base import *
from ..conversions import *
from ..func_utils import *
from pyjsparser import parse
from ..byte_trans import ByteCodeGenerator, Code
def Function(this, args):
# convert arguments to python list of strings
a = map(to_string, tuple(args))
_body = u';'
_args = ()
if len(a):
_body = u'%s;' % a[-1]
_args = a[:-1]
return executable_function(_body, _args, args.space, global_context=True)
def executable_function(_body, _args, space, global_context=True):
func_str = u'(function (%s) { ; %s ; });' % (u', '.join(_args), _body)
co = executable_code(
code_str=func_str, space=space, global_context=global_context)
return co()
# you can use this one lovely piece of function to compile and execute code on the fly! Watch out though as it may generate lots of code.
# todo tape cleanup? we dont know which pieces are needed and which are not so rather impossible without smarter machinery something like GC,
# a one solution would be to have a separate tape for functions
def executable_code(code_str, space, global_context=True):
# parse first to check if any SyntaxErrors
parsed = parse(code_str)
old_tape_len = len(space.byte_generator.exe.tape)
space.byte_generator.record_state()
start = space.byte_generator.exe.get_new_label()
skip = space.byte_generator.exe.get_new_label()
space.byte_generator.emit('JUMP', skip)
space.byte_generator.emit('LABEL', start)
space.byte_generator.emit(parsed)
space.byte_generator.emit('NOP')
space.byte_generator.emit('LABEL', skip)
space.byte_generator.emit('NOP')
space.byte_generator.restore_state()
space.byte_generator.exe.compile(
start_loc=old_tape_len
) # dont read the code from the beginning, dont be stupid!
ctx = space.GlobalObj if global_context else space.exe.current_ctx
def ex_code():
ret, status, token = space.byte_generator.exe.execute_fragment_under_context(
ctx, start, skip)
# todo Clean up the tape!
# this is NOT a way to do that because the fragment may contain the executable code! We dont want to remove it
#del space.byte_generator.exe.tape[old_tape_len:]
if status == 0:
return ret
elif status == 3:
raise token
else:
raise RuntimeError(
'Unexpected return status during JIT execution: %d' % status)
return ex_code
def _eval(this, args):
code_str = to_string(get_arg(args, 0))
return executable_code(code_str, args.space, global_context=True)()
def log(this, args):
print(' '.join(map(to_string, args)))
return undefined