Press n or j to go to the next uncovered block, b, p or k for the previous block.
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* @license Apache-2.0
*
* Copyright (c) 2018 The Stdlib Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
'use strict';
// MODULES //
var minstd = require( '@stdlib/random/base/minstd-shuffle' );
var createContext = require( './context.js' );
var asyncSource = require( './async.js' );
var syncSource = require( './sync.js' );
var compile = require( './vm_compile.js' );
// MAIN //
/**
* Evaluates source code within a V8 virtual machine context.
*
* @private
* @param {string} src - source code
* @param {Object} opts - options
* @param {string} filename - filename
* @param {string} dirname - directory name
* @param {Callback} clbk - callback to invoke upon completion
* @returns {void}
*/
function evaluate( src, opts, filename, dirname, clbk ) {
var context;
var tmp;
var fcn;
var err;
var id;
// Create an id:
id = minstd();
// Create an execution context:
context = createContext( done );
// Generate the source code to evaluate...
if ( opts.asynchronous ) {
src = asyncSource( id, src, opts );
} else {
src = syncSource( id, src, opts );
}
// Compile the source code:
fcn = compile( filename, src );
// Execute the source code:
tmp = fcn.call( context, require, filename, dirname );
// Check that the snippet did not prematurely return...
if ( tmp !== id ) {
err = new Error( 'evaluation error. Unable to retrieve evaluation results. Ensure that the provided snippet does not return prematurely.' );
return done( err );
}
/**
* Callback invoked upon executing source code.
*
* @private
* @param {(Error|null)} error - error object
* @param {NonNegativeIntegerArray} results - results
* @returns {void}
*/
function done( error, results ) {
if ( error ) {
return clbk( error );
}
return clbk( null, results );
}
}
// EXPORTS //
module.exports = evaluate;
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