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73 lines
1.4 KiB
Text
73 lines
1.4 KiB
Text
/**
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* @fileoverview
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* Get the plain-text value of a hast node.
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* @longdescription
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* ## Use
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*
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* ```js
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* import {h} from 'hastscript'
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* import {toString} from 'hast-util-to-string'
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*
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* toString(h('p', 'Alpha'))
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* //=> 'Alpha'
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* toString(h('div', [h('b', 'Bold'), ' and ', h('i', 'italic'), '.']))
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* //=> 'Bold and italic.'
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* ```
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*
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* ## API
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*
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* ### `toString(node)`
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*
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* Transform a node to a string.
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*/
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/**
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* @typedef {import('hast').Root} Root
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* @typedef {import('hast').Element} Element
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* @typedef {Root|Root['children'][number]} Node
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*/
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/**
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* Get the plain-text value of a hast node.
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*
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* @param {Node} node
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* @returns {string}
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*/
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export function toString(node) {
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// “The concatenation of data of all the Text node descendants of the context
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// object, in tree order.”
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if ('children' in node) {
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return all(node)
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}
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// “Context object’s data.”
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return 'value' in node ? node.value : ''
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}
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/**
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* @param {Node} node
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* @returns {string}
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*/
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function one(node) {
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if (node.type === 'text') {
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return node.value
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}
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return 'children' in node ? all(node) : ''
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}
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/**
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* @param {Root|Element} node
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* @returns {string}
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*/
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function all(node) {
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let index = -1
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/** @type {string[]} */
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const result = []
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while (++index < node.children.length) {
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result[index] = one(node.children[index])
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}
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return result.join('')
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}
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