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c20f20c | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 | import * as entities from 'entities'
import parseTag from './parse-tag'
const tagRE = /<[a-zA-Z0-9\-!/](?:"[^"]*"|'[^']*'|[^'">])*>/g
const whitespaceRE = /^\s*$/
const textContainerNames = ['mtext', 'mi', 'mn', 'mo', 'ms']
// re-used obj for quick lookups of components
const empty = Object.create(null)
export function parse(html, options = {}) {
const result = []
const arr = []
let current
let level = -1
html.replace(tagRE, (tag, index) => {
const isOpen = tag.charAt(1) !== '/'
const isComment = tag.startsWith('<!--')
const start = index + tag.length
const nextChar = html.charAt(start)
let parent
if (isComment) {
const comment = parseTag(tag)
// if we're at root, push new base node
if (level < 0) {
result.push(comment)
return result
}
parent = arr[level]
parent.children.push(comment)
return result
}
if (isOpen) {
level++
current = parseTag(tag)
if (current.type === 'tag' && options.components?.[current.name]) {
current.type = 'component'
}
if (
textContainerNames.includes(current.name) &&
!current.voidElement &&
nextChar &&
nextChar !== '<'
) {
const data = html.slice(start, html.indexOf('<', start)).trim()
current.children.push({
type: 'text',
data: options.disableDecode ? data : entities.decodeXML(data)
})
}
// if we're at root, push new base node
if (level === 0) {
result.push(current)
}
parent = arr[level - 1]
if (parent) {
parent.children.push(current)
}
arr[level] = current
}
if (!isOpen || current.voidElement) {
if (level > -1 && (current.voidElement || current.name === tag.slice(2, -1))) {
level--
// move current up a level to match the end tag
current = level === -1 ? result : arr[level]
}
if (
level > -1 &&
textContainerNames.includes[arr[level].name] &&
nextChar !== '<' &&
nextChar
) {
// trailing text node
parent = arr[level].children
// calculate correct end of the content slice in case there's
// no tag after the text node.
const end = html.indexOf('<', start)
let data = html.slice(start, end === -1 ? undefined : end)
// if a node is nothing but whitespace, collapse it as the spec states:
// https://www.w3.org/TR/html4/struct/text.html#h-9.1
if (whitespaceRE.test(data)) {
data = ' '
}
// don't add whitespace-only text nodes if they would be trailing text nodes
// or if they would be leading whitespace-only text nodes:
// * end > -1 indicates this is not a trailing text node
// * leading node is when level is -1 and parent has length 0
if ((end > -1 && level + parent.length >= 0) || data !== ' ') {
parent.push({
type: 'text',
data: options.disableDecode ? data : entities.decodeXML(data)
})
}
}
}
})
return result
}
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