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/*** EXPORT ------------------------------------------- ***/
export default (input: string): string => {
const codeBlocks: { content: string; index: number; language: string; }[] = [];
const codeBlockPattern = /```(\w*)[ \t]*\r?\n([\s\S]*?)\r?\n[ \t]*```/g;
const inlineCode: string[] = [];
const inlineCodePattern = /`([^`]+)`/g;
const refPattern = /\s*\[(\w+)\]\s+<([^>]+)>$/gm;
const refs = new Map<string, string>();
/*** extract and replace code blocks with placeholders ***/
let processed = input.replace(codeBlockPattern, (_match, language, content) => {
const index = codeBlocks.length;
codeBlocks.push({
content: content.trimEnd(),
index,
language: language || ""
});
return `<!--CODE:BLOCK:${index}-->`;
});
/*** extract inline code ***/
processed = processed.replace(inlineCodePattern, (_match, content) => {
const index = inlineCode.length;
inlineCode.push(content);
return `<!--INLINE:CODE:${index}-->`;
});
/*** extract reference definitions (images/links) ***/
for (const match of processed.matchAll(refPattern)) {
const [, ref, url] = match;
refs.set(ref, url);
}
/*** remove reference definitions before blockquote processing ***/
processed = processed.replace(refPattern, "");
/*** process blockquotes ***/
processed = processBlockquotes(processed);
processed = processed
.replace(/(\n){6}/g, "") /*** remove 6 lines from the top of the memo ***/
.replace("References", "") /*** remove reference to reference definitions from output ***/
.replace(/(\*\*|__)(.*?)\1/g, `<strong style="white-space: nowrap;">$2</strong>`) /*** bold ***/
.replace(/(\*|_)(.*?)\1/g, "<em>$2</em>") /*** italic ***/
.replace(/(\~\~)(.*?)\1/g, `<del>$2</del>`) /*** strikethrough ***/
.replace(/'/g, "’") /*** fancy apostrophe ***/
.replace(/(:nbhyp:)/g, "‑") /*** non‑breaking hyphen ***/
// deno-lint-ignore no-irregular-whitespace
.replace(/(:nbsp:)/g, " ") /*** non‑breaking space ***/
.replace(/(\.\.\.)/g, "…") /*** ellipsis ***/
.replace(/---/g, "<hr/>")
.replace(/📸\[([^\]]+)\]\[(\w+)\]/g, (match, alt, ref) => {
const url = refs.get(ref);
return url ? `<img src="${url}" alt="${alt}" loading="lazy">` : match;
})
.replace(/📼\[([^\]]+)\]\[(\w+)\]/g, (match, alt, ref) => {
const url = refs.get(ref);
return url ? `<iframe allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share" allowfullscreen frameborder="0" referrerpolicy="strict-origin-when-cross-origin" src="${url}" title="${alt}"></iframe>` : match;
})
.replace(/\[(\w+)\](?!\s+<|\()/g, (match, ref) => {
const url = refs.get(ref);
const isExternal = url && url.startsWith("http://") || url && url.startsWith("https://");
return url ?
isExternal ?
`<a href="${url + (url.includes("?") ? "&" : "?")}ref=blog.webb.page" target="_blank">[${ref}]</a>` :
`<a href="${url}">[${ref}]</a>` :
match;
})
.replace(/\[([^\]]+)\]\(([^)]+)\)/g, (_match, text, url) => {
const isExternal = url.startsWith("http://") || url.startsWith("https://");
return isExternal ?
`<a href="${url}?ref=blog.webb.page" target="_blank">${text}</a>` :
`<a href="${url}">${text}</a>`;
});
/*** restore inline code ***/
for (const block in inlineCode) {
processed = processed.replace(`<!--INLINE:CODE:${block}-->`, `<code>${escapeHtml(inlineCode[block])}</code>`);
}
/*** restore code blocks ***/
for (const block of codeBlocks) {
const langAttr = block.language ? ` data-language="${block.language}"` : "";
const html = `<pre><code${langAttr}>\n${escapeHtml(block.content)}\n\n</code></pre>`;
processed = processed.replace(`<!--CODE:BLOCK:${block.index}-->`, html);
}
// console.log(processed); /*** for troubleshooting ***/
return processed.trimEnd();
}
/*** HELPER ------------------------------------------- ***/
function escapeHtml(str: string): string {
return str
.replace(/&/g, "&")
.replace(/</g, "<")
.replace(/>/g, ">")
.replace(/"/g, """);
}
function processBlockquotes(input: string): string {
const lines = input.split("\n");
const result: string[] = [];
let quoteBuffer: string[] = [];
const flushQuote = () => {
if (quoteBuffer.length > 0) {
/*** special indentation to fit memo/remark formatting ***/
result.push(`<blockquote>\n ${quoteBuffer.join("\n ")}\n\n</blockquote>`);
quoteBuffer = [];
// TODO
// : handle links within blockquotes (WM-032)
}
};
for (const line of lines) {
/*** preserve code block placeholders ***/
if (line.includes("<!--CODE:BLOCK") || line.includes("<!--INLINE:CODE")) {
flushQuote();
result.push(line);
continue;
}
const quoteMatch = line.match(/\s*>\s?(.*)$/);
if (quoteMatch) {
quoteBuffer.push(quoteMatch[1]);
} else {
flushQuote();
result.push(line);
}
}
flushQuote();
return result.join("\n");
}
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