spel2js/src/ast/ConstructorReference.js

Parse Spring Expression Language in JavaScript

/*
 * Copyright 2002-2019 the original author or 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
 *
 *      https://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.
 */

import {SpelNode} from './SpelNode';
import {Stack} from '../lib/Stack';

/**
 * Represents the invocation of a constructor. Either a constructor on a regular type or
 * construction of an array. When an array is constructed, an initializer can be specified.
 *
 * <p>Examples:<br>
 * new String('hello world')<br>
 * new int[]{1,2,3,4}<br>
 * new int[3] new int[3]{1,2,3}
 *
 * @author Andy Clement
 * @author Juergen Hoeller
 * @since 3.0
 */
 function createNode(position, dimensions, nodes) {
    var isArray = nodes !== undefined;
    var dimension;
    if (isArray) {
        dimension = dimensions.length && dimensions[0] && dimensions[0].getType() === 'number' ? dimensions[0].getValue() : null;
    } else {
        nodes = dimensions;
        dimensions = undefined;
    }
    const [_qualifiedIdentifier, ...args] = nodes;
    
    var node = SpelNode.create('constructorref', position, ...nodes);

    node.getRaw = function () {
        return dimension;
    };

    node.getValue = function (state) {
        if (isArray && args.length <= 1) {
            var compiledArgs = [];

            //populate arguments
            args.forEach(function (arg) {
                // reset the active context to root context for evaluating argument
                const currentActiveContext = state.activeContext
                state.activeContext = new Stack();
                state.activeContext.push(state.rootContext);

                // evaluate argument
                compiledArgs.push(arg.getValue(state));

                // reset the active context
                state.activeContext = currentActiveContext;
            });

            if (args.length === 1) {
                return compiledArgs[0];
            } else {
                return dimension ? new Array(dimension) : [];
            }
        }

        throw {
            name: 'MethodNotImplementedException',
            message: 'ConstructorReference: Not implemented'
        }
    };

    return node;
}

export var ConstructorReference =  {
    create: createNode
};