165 lines
4.4 KiB
JavaScript
165 lines
4.4 KiB
JavaScript
import fs from "fs";
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import map from "map-stream";
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import escape from "escape-html";
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import * as CSS from "./css.js";
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export const GMI_REGEX = /^((=>\s?(?<href>[^\s]+)(\s(?<title>.+))?)|(?<pre>```\s?(?<alt>.+)?)|(###\s?(?<h3>.+))|(##\s?(?<h2>.+))|(#\s?(?<h1>.+))|(\*\s?(?<li>.+))|(>\s?(?<quote>.+))|(?<text>(.+)?))$/;
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export const tokenize = (gemtext) =>
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gemtext.split("\n").map((line) => GMI_REGEX.exec(line).groups);
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export function block(
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{ text, href, title, pre, alt, h1, h2, h3, li, quote },
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options = {}
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) {
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let type = "p";
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let props = "";
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let content = "";
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if (text) {
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content = text;
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}
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if (h1) {
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type = "h1";
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content = h1;
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}
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if (h2) {
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type = "h2";
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content = h2;
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}
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if (h3) {
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type = "h3";
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content = h3;
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}
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if (li) {
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type = "li";
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content = li;
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}
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if (quote) {
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type = "blockquote";
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content = quote;
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}
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if (href) {
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const matchesExt = (url, exts) =>
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exts.some((ext) => new RegExp(`\.${ext}$`).test(url));
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if (options.image && matchesExt(href, options.image)) {
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type = "img";
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props += ` src="${href}"` + alt ? ` title="${alt}"` : "";
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} else if (options.audio && matchesExt(href, options.audio)) {
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type = "audio";
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props += ` controls src="${href}"` + alt ? ` title="${alt}"` : "";
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} else if (options.video && matchesExt(href, options.video)) {
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type = "video";
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props += ` controls src="${href}"` + alt ? ` title="${alt}"` : "";
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} else {
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type = "a";
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content = title || href;
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props += ` href="${href}"`;
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}
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}
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if (options.body || options.inline)
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content !== "" ? (props += options.inlineCSS(type)) : "";
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return `<${type}${props}>${escape(content)}</${type}>`;
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}
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export function body(tokens, options) {
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let blocks = [];
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let cursor = tokens.shift();
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while (tokens.length) {
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if (cursor.pre) {
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blocks.push(
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`<pre${cursor.alt ? ` title="${cursor.alt}"` : ""}${
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options.body || options.inline ? options.inlineCSS("pre") : ""
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}>`
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);
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const closing = tokens.findIndex((token) => token.pre);
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blocks = blocks.concat(tokens.slice(0, closing).map(({ text }) => text));
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blocks.push("</pre>");
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tokens = tokens.slice(closing + 1);
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} else if (cursor.li) {
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blocks.push(
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`<ul${options.body || options.inline ? options.inlineCSS("ul") : ""}>`
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);
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const closing = tokens.findIndex((token) => !token.li);
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blocks = blocks
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.concat([block(cursor)])
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.concat(tokens.slice(0, closing).map(block));
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blocks.push("</ul>");
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tokens = tokens.slice(closing);
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} else {
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blocks.push(block(cursor, options));
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}
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cursor = tokens.shift();
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}
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return blocks.join("\n");
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}
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export function toHTML(gemtext, options) {
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const tokens = tokenize(gemtext);
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options.inlineCSS = CSS.inline(options);
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if (options.body) return body(tokens, options);
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return `<!DOCTYPE html>
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<html lang="${options.language}" dir="${
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options.dir
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}" style='${options.inlineCSS("html")}'>
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<head>${head(
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Object.assign(options, {
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title: tokens[0].h1,
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description: description(tokens, options),
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})
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)}</head>
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<body${options.inlineCSS("body")}>
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${body(tokens, options)}
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</body>
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</html>
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`;
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}
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export function head(options) {
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return `
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<meta charset="${options.charset}">
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<meta name="viewport" content="width=device-width,initial-scale=1">${CSS.style(
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options
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)}
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<title>${options.title}</title>${
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!options.author ? "" : `\n<meta name="author" content="${options.author}">`
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}${
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!options.description
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? ""
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: `\n<meta name="description" content="${escape(options.description)}">`
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}${
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!options.canonical
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? ""
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: `\n<link rel="canonical" href="${options.canonical}">`
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}
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`;
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}
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function description(tokens, options) {
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const truncate = (text, limit) =>
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text.length > limit ? `${text.substring(0, limit)}...` : text;
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let description =
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options.descriptions > 0
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? tokens.find((token) => {
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return token.text && token.text !== "";
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})
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: false;
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return description && truncate(description.text, options.descriptions);
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}
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export const GMI_EXT = /\.gmi$/;
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export function streamHTML(options) {
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return map((file, cb) => {
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if (!GMI_EXT.test(file.path)) return cb(null);
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file.contents = Buffer.from(
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toHTML(file.contents.toString("utf-8"), options)
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);
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file.path = file.path.replace(GMI_EXT, ".html");
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return cb(null, file);
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});
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}
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