tptimer/env/lib/python2.7/site-packages/execjs/_pyv8runtime.py

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2018-07-20 05:43:02 +00:00
import json
import contextlib
import execjs._exceptions as exceptions
from execjs._abstract_runtime import AbstractRuntime
from execjs._abstract_runtime_context import AbstractRuntimeContext
from execjs._misc import encode_unicode_codepoints
try:
import PyV8
except ImportError:
_pyv8_available = False
else:
_pyv8_available = True
class PyV8Runtime(AbstractRuntime):
'''Runtime to execute codes with PyV8.'''
def __init__(self):
pass
@property
def name(self):
return "PyV8"
def _compile(self, source, cwd=None):
return self.Context(source)
def is_available(self):
return _pyv8_available
class Context(AbstractRuntimeContext):
def __init__(self, source=""):
self._source = source
def is_available(self):
return _pyv8_available
def _exec_(self, source):
source = '''\
(function() {{
{0};
{1};
}})()'''.format(
encode_unicode_codepoints(self._source),
encode_unicode_codepoints(source)
)
source = str(source)
# backward compatibility
with contextlib.nested(PyV8.JSContext(), PyV8.JSEngine()) as (ctxt, engine):
js_errors = (PyV8.JSError, IndexError, ReferenceError, SyntaxError, TypeError)
try:
script = engine.compile(source)
except js_errors as e:
raise exceptions.RuntimeError(e)
try:
value = script.run()
except js_errors as e:
raise exceptions.ProgramError(e)
return self.convert(value)
def _eval(self, source):
return self.exec_('return ' + encode_unicode_codepoints(source))
def _call(self, identifier, *args):
args = json.dumps(args)
return self.eval("{identifier}.apply(this, {args})".format(identifier=identifier, args=args))
@classmethod
def convert(cls, obj):
from PyV8 import _PyV8
if isinstance(obj, bytes):
return obj.decode('utf8')
if isinstance(obj, _PyV8.JSArray):
return [cls.convert(v) for v in obj]
elif isinstance(obj, _PyV8.JSFunction):
return None
elif isinstance(obj, _PyV8.JSObject):
ret = {}
for k in obj.keys():
v = cls.convert(obj[k])
if v is not None:
ret[cls.convert(k)] = v
return ret
else:
return obj