59 lines
1.7 KiB
JavaScript
59 lines
1.7 KiB
JavaScript
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import {isBlank} from 'angular2/src/facade/lang';
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import {List, ListWrapper} from 'angular2/src/facade/collection';
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import {CompileElement} from './compile_element';
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import {CompileStep} from './compile_step';
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/**
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* Controls the processing order of elements.
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* Right now it only allows to add a parent element.
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*/
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export class CompileControl {
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_steps:List<CompileStep>;
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_currentStepIndex:number;
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_parent:CompileElement;
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_results;
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_additionalChildren;
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constructor(steps) {
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this._steps = steps;
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this._currentStepIndex = 0;
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this._parent = null;
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this._results = null;
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this._additionalChildren = null;
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}
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// only public so that it can be used by compile_pipeline
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internalProcess(results, startStepIndex, parent:CompileElement, current:CompileElement) {
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this._results = results;
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var previousStepIndex = this._currentStepIndex;
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var previousParent = this._parent;
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for (var i=startStepIndex; i<this._steps.length; i++) {
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var step = this._steps[i];
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this._parent = parent;
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this._currentStepIndex = i;
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step.process(parent, current, this);
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parent = this._parent;
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}
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ListWrapper.push(results, current);
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this._currentStepIndex = previousStepIndex;
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this._parent = previousParent;
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var localAdditionalChildren = this._additionalChildren;
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this._additionalChildren = null;
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return localAdditionalChildren;
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}
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addParent(newElement:CompileElement) {
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this.internalProcess(this._results, this._currentStepIndex+1, this._parent, newElement);
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this._parent = newElement;
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}
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addChild(element:CompileElement) {
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if (isBlank(this._additionalChildren)) {
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this._additionalChildren = ListWrapper.create();
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}
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ListWrapper.push(this._additionalChildren, element);
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}
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}
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