hackmd-to-html-cli/src/markdown/utils.ts

A node.js CLI tool for converting HackMD markdown to HTML.

// modified from:
// https://github.com/markdown-it/markdown-it/blob/0fe7ccb4b7f30236fb05f623be6924961d296d3d/lib/common/utils.mjs

const HTML_ESCAPE_TEST_RE = /[&<>"]/
const HTML_ESCAPE_REPLACE_RE = /[&<>"]/g

function replaceUnsafeChar(ch: string): string {
    switch (ch) {
        case '&':
            return '&amp;'
        case '<':
            return '&lt;'
        case '>':
            return '&gt;'
        case '"':
            return '&quot;'
    }
    return ""
}

export function escapeHtml(str: string): string {
    if (HTML_ESCAPE_TEST_RE.test(str)) {
        return str.replace(HTML_ESCAPE_REPLACE_RE, replaceUnsafeChar)
    }
    return str
}