55 lines
1.7 KiB
JavaScript
55 lines
1.7 KiB
JavaScript
/*
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* Copyright 2014 Mirantis, Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may
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* not use this file except in compliance with the License. You may obtain
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* a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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**/
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import _ from 'underscore';
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import ExpressionParser from 'expression/parser';
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import * as expressionObjects from 'expression/objects';
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var expressionCache = {};
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class Expression {
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constructor(expressionText, models = {}, {strict = true} = {}) {
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this.strict = strict;
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this.expressionText = expressionText;
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this.models = models;
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this.compiledExpression = this.getCompiledExpression();
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return this;
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}
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evaluate(extraModels) {
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// FIXME(vkramskikh): currently Jison supports sharing state
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// only via ExpressionParser.yy. It is unsafe and could lead to
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// issues in case we start to use webworkers
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ExpressionParser.yy.expression = this;
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this.extraModels = extraModels;
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var value = this.compiledExpression.evaluate();
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delete this.extraModels;
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return value;
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}
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getCompiledExpression() {
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var cacheEntry = expressionCache[this.expressionText];
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if (!cacheEntry) {
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cacheEntry = expressionCache[this.expressionText] =
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ExpressionParser.parse(this.expressionText);
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}
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return cacheEntry;
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}
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}
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_.extend(ExpressionParser.yy, expressionObjects);
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export default Expression;
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