All files / shared/src escapeHtml.ts

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const escapeRE = /["'&<>]/
 
export function escapeHtml(string: unknown): string {
  const str = '' + string
  const match = escapeRE.exec(str)
 
  if (!match) {
    return str
  }
 
  let html = ''
  let escaped: string
  let index: number
  let lastIndex = 0
  for (index = match.index; index < str.length; index++) {
    switch (str.charCodeAt(index)) {
      case 34: // "
        escaped = '&quot;'
        break
      case 38: // &
        escaped = '&amp;'
        break
      case 39: // '
        escaped = '&#39;'
        break
      case 60: // <
        escaped = '&lt;'
        break
      case 62: // >
        escaped = '&gt;'
        break
      default:
        continue
    }
 
    if (lastIndex !== index) {
      html += str.slice(lastIndex, index)
    }
 
    lastIndex = index + 1
    html += escaped
  }
 
  return lastIndex !== index ? html + str.slice(lastIndex, index) : html
}
 
// https://www.w3.org/TR/html52/syntax.html#comments
const commentStripRE = /^(?:-?>)+|<!--|-->|--!>|<!-$/g
 
export function escapeHtmlComment(src: string): string {
  let prev: string
  do {
    prev = src
    src = src.replace(commentStripRE, '')
  } while (src !== prev)
  return src
}
 
export const cssVarNameEscapeSymbolsRE: RegExp =
  /[ !"#$%&'()*+,./:;<=>?@[\\\]^`{|}~]/g
 
export function getEscapedCssVarName(
  key: string,
  doubleEscape: boolean,
): string {
  return key.replace(cssVarNameEscapeSymbolsRE, s =>
    doubleEscape ? (s === '"' ? '\\\\\\"' : `\\\\${s}`) : `\\${s}`,
  )
}