#! /usr/bin/env python3
# -*- coding: utf-8 -*-
# Copyright 2013, 2017, Marten de Vries
#
# This file is part of OpenTeacher.
#
# OpenTeacher is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# OpenTeacher is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with OpenTeacher. If not, see <http://www.gnu.org/licenses/>.
import os
class JSEvaluatorModule:
"""Note that this class only implements a small subset of Node, just enough
for the JS modules OT needs to run at the time of writing.
"""
def __init__(self, moduleManager, *args, **kwargs):
super().__init__(*args, **kwargs)
self._mm = moduleManager
self.type = "javaScriptEvaluator"
self.requires = (
self._mm.mods(type="qtApp"),
self._mm.mods(type="javaScriptResolver"),
)
@property
def _getCode(self):
modules = next(iter(self._mm.mods(type='modules')))
return modules.default('active', type='javaScriptResolver').resolve
def _buildFsMod(self):
mod = {}
def readFileSync(path, opts):
with open(path, encoding=opts.encoding) as f:
return f.read()
mod['readFileSync'] = readFileSync
return mod
def _require(self, evaluator, modName):
if modName == 'fs':
return self._buildFsMod()
path, code = self._getCode(modName)
loadMod = evaluator.eval('''
function load(module, exports, __dirname) {
"use strict";
%s};
function (dirName) {
var mod = {exports: {}};
load(mod, mod.exports, dirName);
return mod.exports;
};
''' % code)
return loadMod(os.path.dirname(path))
def loadModule(self, modName):
evaluator = self.createEvaluator()
evaluator.global_[modName] = self._require(evaluator, modName)
return evaluator
def createEvaluator(self):
__doc__ = "Returns a:\n\n" + jseval.JSEvaluator.__doc__
evaluator = jseval.JSEvaluator()
evaluator.global_.require = lambda *args: self._require(evaluator, *args)
return evaluator
def enable(self):
global jseval
try:
import jseval
except ImportError as e:
print(e)
return
self.active = True
def disable(self):
self.active = False
def init(moduleManager):
return JSEvaluatorModule(moduleManager)