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145 lines
3.1 KiB
145 lines
3.1 KiB
'use strict'
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/**
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* # API
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*
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* @author Ivan Voischev (@voischev),
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* Anton Winogradov (@awinogradov),
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* Alexej Yaroshevich (@zxqfox),
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* Vasiliy (@Yeti-or)
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*
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* @namespace tree
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*/
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function Api () {
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this.walk = walk
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this.match = match
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}
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/**
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* Walks the tree and passes all nodes via a callback
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*
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* @memberof tree
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*
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* @param {Function} cb Callback
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* @return {Function} Callback(node)
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*
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*@example
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* ```js
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* export const walk = (tree) => {
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* tree.walk((node) => {
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* let classes = node.attrs && node.attrs.class.split(' ') || []
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*
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* if (classes.includes(className)) return cb(node)
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* return node
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* })
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* }
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* ```
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*/
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function walk (cb) {
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return traverse(this, cb)
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}
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/**
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* Matches an expression to search for nodes in the tree
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*
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* @memberof tree
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*
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* @param {String|RegExp|Object|Array} expression - Matcher(s) to search
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* @param {Function} cb Callback
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*
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* @return {Function} Callback(node)
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*
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* @example
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* ```js
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* export const match = (tree) => {
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* // Single matcher
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* tree.match({ tag: 'custom-tag' }, (node) => {
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* let tag = node.tag
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*
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* Object.assign(node, { tag: 'div', attrs: {class: tag} })
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*
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* return node
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* })
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* // Multiple matchers
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* tree.match([{ tag: 'b' }, { tag: 'strong' }], (node) => {
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* let style = 'font-weight: bold;'
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*
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* node.tag = 'span'
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*
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* node.attrs
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* ? ( node.attrs.style
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* ? ( node.attrs.style += style )
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* : node.attrs.style = style
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* )
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* : node.attrs = { style: style }
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*
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* return node
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* })
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* }
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* ```
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*/
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function match (expression, cb) {
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return Array.isArray(expression)
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? traverse(this, node => {
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for (let i = 0; i < expression.length; i++) {
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if (compare(expression[i], node)) return cb(node)
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}
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return node
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})
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: traverse(this, node => {
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if (compare(expression, node)) return cb(node)
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return node
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})
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}
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module.exports = Api
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module.exports.match = match
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module.exports.walk = walk
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/** @private */
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function traverse (tree, cb) {
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if (Array.isArray(tree)) {
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for (let i = 0; i < tree.length; i++) {
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tree[i] = traverse(cb(tree[i]), cb)
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}
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} else if (
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tree &&
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typeof tree === 'object' &&
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Object.prototype.hasOwnProperty.call(tree, 'content')
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) traverse(tree.content, cb)
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return tree
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}
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/** @private */
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function compare (expected, actual) {
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if (expected instanceof RegExp) {
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if (typeof actual === 'object') return false
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if (typeof actual === 'string') return expected.test(actual)
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}
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if (typeof expected !== typeof actual) return false
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if (typeof expected !== 'object' || expected === null) {
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return expected === actual
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}
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if (Array.isArray(expected)) {
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return expected.every(exp => [].some.call(actual, act => compare(exp, act)))
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}
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return Object.keys(expected).every(key => {
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const ao = actual[key]
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const eo = expected[key]
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if (typeof eo === 'object' && eo !== null && ao !== null) {
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return compare(eo, ao)
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}
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if (typeof eo === 'boolean') {
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return eo !== (ao == null)
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}
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return ao === eo
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})
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}
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