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138 lines
3.7 KiB
138 lines
3.7 KiB
/*
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Copyright 2012-2015, Yahoo Inc.
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Copyrights licensed under the New BSD License. See the accompanying LICENSE file for terms.
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*/
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'use strict';
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/**
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* An object with methods that are called during the traversal of the coverage tree.
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* A visitor has the following methods that are called during tree traversal.
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*
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* * `onStart(root, state)` - called before traversal begins
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* * `onSummary(node, state)` - called for every summary node
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* * `onDetail(node, state)` - called for every detail node
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* * `onSummaryEnd(node, state)` - called after all children have been visited for
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* a summary node.
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* * `onEnd(root, state)` - called after traversal ends
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*
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* @param delegate - a partial visitor that only implements the methods of interest
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* The visitor object supplies the missing methods as noops. For example, reports
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* that only need the final coverage summary need implement `onStart` and nothing
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* else. Reports that use only detailed coverage information need implement `onDetail`
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* and nothing else.
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* @constructor
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*/
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class Visitor {
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constructor(delegate) {
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this.delegate = delegate;
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}
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}
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['Start', 'End', 'Summary', 'SummaryEnd', 'Detail']
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.map(k => `on${k}`)
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.forEach(fn => {
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Object.defineProperty(Visitor.prototype, fn, {
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writable: true,
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value(node, state) {
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if (typeof this.delegate[fn] === 'function') {
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this.delegate[fn](node, state);
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}
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}
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});
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});
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class CompositeVisitor extends Visitor {
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constructor(visitors) {
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super();
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if (!Array.isArray(visitors)) {
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visitors = [visitors];
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}
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this.visitors = visitors.map(v => {
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if (v instanceof Visitor) {
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return v;
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}
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return new Visitor(v);
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});
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}
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}
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['Start', 'Summary', 'SummaryEnd', 'Detail', 'End']
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.map(k => `on${k}`)
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.forEach(fn => {
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Object.defineProperty(CompositeVisitor.prototype, fn, {
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value(node, state) {
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this.visitors.forEach(v => {
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v[fn](node, state);
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});
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}
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});
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});
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class BaseNode {
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isRoot() {
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return !this.getParent();
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}
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/**
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* visit all nodes depth-first from this node down. Note that `onStart`
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* and `onEnd` are never called on the visitor even if the current
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* node is the root of the tree.
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* @param visitor a full visitor that is called during tree traversal
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* @param state optional state that is passed around
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*/
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visit(visitor, state) {
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if (this.isSummary()) {
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visitor.onSummary(this, state);
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} else {
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visitor.onDetail(this, state);
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}
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this.getChildren().forEach(child => {
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child.visit(visitor, state);
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});
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if (this.isSummary()) {
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visitor.onSummaryEnd(this, state);
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}
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}
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}
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/**
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* abstract base class for a coverage tree.
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* @constructor
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*/
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class BaseTree {
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constructor(root) {
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this.root = root;
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}
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/**
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* returns the root node of the tree
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*/
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getRoot() {
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return this.root;
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}
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/**
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* visits the tree depth-first with the supplied partial visitor
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* @param visitor - a potentially partial visitor
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* @param state - the state to be passed around during tree traversal
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*/
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visit(visitor, state) {
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if (!(visitor instanceof Visitor)) {
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visitor = new Visitor(visitor);
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}
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visitor.onStart(this.getRoot(), state);
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this.getRoot().visit(visitor, state);
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visitor.onEnd(this.getRoot(), state);
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}
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}
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module.exports = {
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BaseTree,
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BaseNode,
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Visitor,
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CompositeVisitor
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};
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