134 lines
3.5 KiB
TypeScript
134 lines
3.5 KiB
TypeScript
import { ParserOptions } from '@vue/compiler-core'
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import namedCharacterReferences from './namedChars.json'
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// lazy compute this to make this file tree-shakable for browser
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let maxCRNameLength: number
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export const decodeHtml: ParserOptions['decodeEntities'] = (
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rawText,
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asAttr
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) => {
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let offset = 0
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const end = rawText.length
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let decodedText = ''
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function advance(length: number) {
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offset += length
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rawText = rawText.slice(length)
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}
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while (offset < end) {
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const head = /&(?:#x?)?/i.exec(rawText)
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if (!head || offset + head.index >= end) {
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const remaining = end - offset
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decodedText += rawText.slice(0, remaining)
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advance(remaining)
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break
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}
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// Advance to the "&".
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decodedText += rawText.slice(0, head.index)
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advance(head.index)
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if (head[0] === '&') {
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// Named character reference.
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let name = ''
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let value: string | undefined = undefined
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if (/[0-9a-z]/i.test(rawText[1])) {
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if (!maxCRNameLength) {
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maxCRNameLength = Object.keys(namedCharacterReferences).reduce(
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(max, name) => Math.max(max, name.length),
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0
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)
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}
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for (let length = maxCRNameLength; !value && length > 0; --length) {
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name = rawText.substr(1, length)
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value = (namedCharacterReferences as Record<string, string>)[name]
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}
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if (value) {
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const semi = name.endsWith(';')
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if (
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asAttr &&
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!semi &&
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/[=a-z0-9]/i.test(rawText[name.length + 1] || '')
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) {
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decodedText += '&' + name
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advance(1 + name.length)
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} else {
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decodedText += value
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advance(1 + name.length)
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}
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} else {
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decodedText += '&' + name
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advance(1 + name.length)
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}
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} else {
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decodedText += '&'
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advance(1)
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}
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} else {
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// Numeric character reference.
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const hex = head[0] === '&#x'
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const pattern = hex ? /^&#x([0-9a-f]+);?/i : /^&#([0-9]+);?/
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const body = pattern.exec(rawText)
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if (!body) {
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decodedText += head[0]
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advance(head[0].length)
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} else {
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// https://html.spec.whatwg.org/multipage/parsing.html#numeric-character-reference-end-state
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let cp = Number.parseInt(body[1], hex ? 16 : 10)
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if (cp === 0) {
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cp = 0xfffd
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} else if (cp > 0x10ffff) {
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cp = 0xfffd
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} else if (cp >= 0xd800 && cp <= 0xdfff) {
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cp = 0xfffd
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} else if ((cp >= 0xfdd0 && cp <= 0xfdef) || (cp & 0xfffe) === 0xfffe) {
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// noop
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} else if (
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(cp >= 0x01 && cp <= 0x08) ||
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cp === 0x0b ||
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(cp >= 0x0d && cp <= 0x1f) ||
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(cp >= 0x7f && cp <= 0x9f)
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) {
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cp = CCR_REPLACEMENTS[cp] || cp
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}
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decodedText += String.fromCodePoint(cp)
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advance(body[0].length)
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}
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}
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}
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return decodedText
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}
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// https://html.spec.whatwg.org/multipage/parsing.html#numeric-character-reference-end-state
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const CCR_REPLACEMENTS: Record<number, number | undefined> = {
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0x80: 0x20ac,
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0x82: 0x201a,
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0x83: 0x0192,
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0x84: 0x201e,
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0x85: 0x2026,
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0x86: 0x2020,
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0x87: 0x2021,
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0x88: 0x02c6,
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0x89: 0x2030,
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0x8a: 0x0160,
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0x8b: 0x2039,
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0x8c: 0x0152,
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0x8e: 0x017d,
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0x91: 0x2018,
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0x92: 0x2019,
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0x93: 0x201c,
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0x94: 0x201d,
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0x95: 0x2022,
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0x96: 0x2013,
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0x97: 0x2014,
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0x98: 0x02dc,
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0x99: 0x2122,
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0x9a: 0x0161,
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0x9b: 0x203a,
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0x9c: 0x0153,
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0x9e: 0x017e,
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0x9f: 0x0178
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}
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