74 lines
2.2 KiB
JavaScript
74 lines
2.2 KiB
JavaScript
/**
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* Extract tag name from tag opener/closer.
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*
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* @param {String} tag - tag string, i.e. '<a href="...">'
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* @return {String} - tagname, i.e. "div"
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*/
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export const getTagName = (tag) => {
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const result = /(?:<\/(\w+)>|<(\w+)\s?.*?\/?>)/gi.exec(tag)
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return result && (result[1] || result[2])
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}
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/**
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* Extract attributes from tag opener.
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*
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* @param {String} tag - tag string, i.e. '<a href="...">'
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* @return {Object} - map of attributes key = attribute name, value = attribute value
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* attributes without values represented as boolean true
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*/
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export const getAttrs = tag => {
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const innertag = tag
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.substring(1, tag.length - 1)
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.replace(new RegExp('^' + getTagName(tag)), '')
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.replace(/\/?$/, '')
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.trim()
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const attrs = Array.from(innertag.matchAll(/([a-z0-9-]+)(?:=("[^"]+?"|'[^']+?'))?/gi))
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.map(([trash, key, value]) => [key, value])
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.map(([k, v]) => {
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if (!v) return [k, true]
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return [k, v.substring(1, v.length - 1)]
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})
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return Object.fromEntries(attrs)
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}
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/**
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* Finds shortcodes in text
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*
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* @param {String} text - original text to find emojis in
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* @param {{ url: String, shortcode: Sring }[]} emoji - list of shortcodes to find
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* @param {Function} processor - function to call on each encountered emoji,
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* function is passed single object containing matching emoji ({ url, shortcode })
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* return value will be inserted into resulting array instead of :shortcode:
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* @return {Array} resulting array with non-emoji parts of text and whatever {processor}
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* returned for emoji
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*/
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export const processTextForEmoji = (text, emojis, processor) => {
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const buffer = []
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let textBuffer = ''
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for (let i = 0; i < text.length; i++) {
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const char = text[i]
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if (char === ':') {
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const next = text.slice(i + 1)
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let found = false
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for (let emoji of emojis) {
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if (next.slice(0, emoji.shortcode.length + 1) === (emoji.shortcode + ':')) {
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found = emoji
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break
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}
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}
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if (found) {
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buffer.push(textBuffer)
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textBuffer = ''
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buffer.push(processor(found))
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i += found.shortcode.length + 1
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} else {
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textBuffer += char
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}
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} else {
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textBuffer += char
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}
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}
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if (textBuffer) buffer.push(textBuffer)
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return buffer
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}
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