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Versions: 26
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Contents
const Node = require('./node'); class Container extends Node { walk(callback) { return this.each((child, i) => { let result = callback(child, i); if (result !== false && child.walk) { result = child.walk(callback); } return result; }); } walkType(type, callback) { if (!type || !callback) { throw new Error('Parameters {type} and {callback} are required.'); } // allow users to pass a constructor, or node type string; eg. Word. const isTypeCallable = typeof type === 'function'; return this.walk((node, index) => { if ((isTypeCallable && node instanceof type) || (!isTypeCallable && node.type === type)) { return callback.call(this, node, index); } }); } } Container.registerWalker = (constructor) => { let walkerName = `walk${constructor.name}`; // plural sugar if (walkerName.lastIndexOf('s') !== walkerName.length - 1) { walkerName += 's'; } if (Container.prototype[walkerName]) { return; } // we need access to `this` so we can't use an arrow function Container.prototype[walkerName] = function(callback) { return this.walkType(constructor, callback); }; }; module.exports = Container;
Version data entries
26 entries across 25 versions & 8 rubygems