katoikia-app/web-ui/web-react/node_modules/postcss-values-parser/old-lib/container.js

49 lines
1.2 KiB
JavaScript

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;