src/ast/CompoundExpression.js
/*
* Copyright 2002-2015 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
*
* 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.
*/
import {SpelNode} from './SpelNode';
/**
* Represents a DOT separated expression sequence, such as 'property1.property2.methodOne()'
*
* @author Andy Clement
* @author Ben March
* @since 0.2.0
*/
function createNode(position, expressionComponents) {
var node = SpelNode.create.apply(null, ['compound', position].concat(expressionComponents));
function buildContextStack(state) {
var childrenCount = node.getChildren().length,
i;
for (i = 0; i < childrenCount; i += 1) {
if (node.getChildren()[i].getType() === 'indexer') {
state.activeContext.push(state.activeContext.peek()[node.getChildren()[i].getValue(state)]);
} else {
state.activeContext.push(node.getChildren()[i].getValue(state));
}
}
return function unbuildContextStack() {
for (i = 0; i < childrenCount; i += 1) {
state.activeContext.pop();
}
};
}
node.getValue = function (state) {
var context = state.activeContext.peek(),
value;
if (!context) {
throw {
name: 'ContextDoesNotExistException',
message: 'Attempting to evaluate compound expression with an undefined context.'
};
}
var unbuildContextStack = buildContextStack(state);
value = state.activeContext.peek();
unbuildContextStack();
return value;
};
node.setValue = function (value, state) {
var unbuildContextStack = buildContextStack(state),
childCount = node.getChildren().length;
state.activeContext.pop();
value = node.getChildren()[childCount - 1].setValue(value, state);
state.activeContext.push(null);
unbuildContextStack();
return value;
};
return node;
}
export var CompoundExpression = {
create: createNode
};