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hono/deno_dist/utils/html.ts

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export type HtmlEscaped = { isEscaped: true; promises?: Promise<string>[] }
export type HtmlEscapedString = string & HtmlEscaped
export type StringBuffer = (string | Promise<string>)[]
// The `escapeToBuffer` implementation is based on code from the MIT licensed `react-dom` package.
// https://github.com/facebook/react/blob/main/packages/react-dom-bindings/src/server/escapeTextForBrowser.js
const escapeRe = /[&<>'"]/
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export const stringBufferToString = async (buffer: StringBuffer): Promise<HtmlEscapedString> => {
let str = ''
const promises: Promise<string>[] = []
for (let i = buffer.length - 1; i >= 0; i--) {
let r = await buffer[i]
if (typeof r === 'object') {
promises.push(...((r as HtmlEscapedString).promises || []))
}
r = await (typeof r === 'object' ? (r as HtmlEscapedString).toString() : r)
if (typeof r === 'object') {
promises.push(...((r as HtmlEscapedString).promises || []))
}
str += r
}
const res = new String(str) as HtmlEscapedString
res.isEscaped = true
res.promises = promises
return res
}
export const escapeToBuffer = (str: string, buffer: StringBuffer): void => {
const match = str.search(escapeRe)
if (match === -1) {
buffer[0] += str
return
}
let escape
let index
let lastIndex = 0
for (index = match; index < str.length; index++) {
switch (str.charCodeAt(index)) {
case 34: // "
escape = '&quot;'
break
case 39: // '
escape = '&#39;'
break
case 38: // &
escape = '&amp;'
break
case 60: // <
escape = '&lt;'
break
case 62: // >
escape = '&gt;'
break
default:
continue
}
buffer[0] += str.substring(lastIndex, index) + escape
lastIndex = index + 1
}
buffer[0] += str.substring(lastIndex, index)
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}