gremlin
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JavaScript Gremlin Language Variant
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<h1 class="page-title">Source: process/translator.js</h1>
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<pre class="prettyprint source linenums"><code>/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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';
const Traversal = require('./traversal').Traversal;
const Bytecode = require('./bytecode');
/**
* Class to translate glv bytecode steps into executable Gremlin-Groovy script
*/
class Translator {
constructor(traversalSource) {
this._traversalSource = traversalSource;
}
getTraversalSource() {
return this._traversalSource;
}
getTargetLanguage() {
return 'gremlin-groovy';
}
of(traversalSource) {
this._traversalSource = traversalSource;
}
/**
* Returns a script representation of the given bytecode instructions.
* @param {Object} bytecodeOrTraversal The traversal or bytecode of a traversal containing step instructions.
* @param {boolean} child Determines if a traversal object should be treated as an anonymous child or if it is a spawn from "g"
* @returns {string} Gremlin-Groovy script
*/
translate(bytecodeOrTraversal, child = false) {
let script = child ? '__' : this._traversalSource;
const bc = bytecodeOrTraversal instanceof Bytecode ? bytecodeOrTraversal : bytecodeOrTraversal.getBytecode();
const instructions = bc.stepInstructions;
// build the script from the glv instructions.
for (let i = 0; i < instructions.length; i++) {
const params = instructions[i].slice(1);
script += '.' + instructions[i][0] + '(';
if (params.length) {
for (let k = 0; k < params.length; k++) {
if (k > 0) {
script += ', ';
}
script += this.convert(params[k]);
}
}
script += ')';
}
return script;
}
/**
* Converts an object to a Gremlin script representation.
* @param {Object} anyObject The object to convert to a script representation
* @returns {string} The Gremlin script representation
*/
convert(anyObject) {
let script = '';
if (Object(anyObject) === anyObject) {
if (anyObject instanceof Traversal) {
script += this.translate(anyObject.getBytecode(), true);
} else if (anyObject.toString() === '[object Object]') {
Object.keys(anyObject).forEach(function (key, index) {
if (index > 0) {
script += ', ';
}
script += `('${key}', `;
if (anyObject[key] instanceof String || typeof anyObject[key] === 'string') {
script += `'${`${anyObject[key]}`.replaceAll("'", "\\'")}'`; // eslint-disable-line quotes
} else {
script += anyObject[key];
}
script += ')';
});
} else if (Array.isArray(anyObject)) {
const parts = [];
for (const item of anyObject) {
parts.push(this.convert(item));
}
script += '[' + parts.join(', ') + ']';
} else {
script += anyObject.toString();
}
} else if (anyObject === undefined || anyObject === null) {
script += 'null';
} else if (typeof anyObject === 'number' || typeof anyObject === 'boolean') {
script += anyObject;
} else {
script += `'${`${anyObject}`.replaceAll("'", "\\'")}'`; // eslint-disable-line quotes
}
return script;
}
}
module.exports = Translator;
</code></pre>
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