641 lines
20 KiB
JavaScript
641 lines
20 KiB
JavaScript
function extend(destination) {
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for (var i = 1; i < arguments.length; i++) {
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var source = arguments[i];
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for (var key in source) {
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if (Object.prototype.hasOwnProperty.call(source, key)) destination[key] = source[key];
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}
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}
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return destination;
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}
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function repeat(character, count) {
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return Array(count + 1).join(character);
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}
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function trimLeadingNewlines(string) {
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return string.replace(/^\n*/, "");
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}
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function trimTrailingNewlines(string) {
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var indexEnd = string.length;
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while (indexEnd > 0 && string[indexEnd - 1] === "\n") indexEnd--;
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return string.substring(0, indexEnd);
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}
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function trimNewlines(string) {
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return trimTrailingNewlines(trimLeadingNewlines(string));
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}
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var blockElements = ["ADDRESS", "ARTICLE", "ASIDE", "AUDIO", "BLOCKQUOTE", "BODY", "CANVAS", "CENTER", "DD", "DIR", "DIV", "DL", "DT", "FIELDSET", "FIGCAPTION", "FIGURE", "FOOTER", "FORM", "FRAMESET", "H1", "H2", "H3", "H4", "H5", "H6", "HEADER", "HGROUP", "HR", "HTML", "ISINDEX", "LI", "MAIN", "MENU", "NAV", "NOFRAMES", "NOSCRIPT", "OL", "OUTPUT", "P", "PRE", "SECTION", "TABLE", "TBODY", "TD", "TFOOT", "TH", "THEAD", "TR", "UL"];
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function isBlock(node) {
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return is(node, blockElements);
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}
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var voidElements = ["AREA", "BASE", "BR", "COL", "COMMAND", "EMBED", "HR", "IMG", "INPUT", "KEYGEN", "LINK", "META", "PARAM", "SOURCE", "TRACK", "WBR"];
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function isVoid(node) {
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return is(node, voidElements);
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}
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function hasVoid(node) {
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return has(node, voidElements);
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}
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var meaningfulWhenBlankElements = ["A", "TABLE", "THEAD", "TBODY", "TFOOT", "TH", "TD", "IFRAME", "SCRIPT", "AUDIO", "VIDEO"];
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function isMeaningfulWhenBlank(node) {
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return is(node, meaningfulWhenBlankElements);
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}
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function hasMeaningfulWhenBlank(node) {
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return has(node, meaningfulWhenBlankElements);
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}
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function is(node, tagNames) {
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return tagNames.indexOf(node.nodeName) >= 0;
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}
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function has(node, tagNames) {
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return node.getElementsByTagName && tagNames.some(function(tagName) {
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return node.getElementsByTagName(tagName).length;
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});
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}
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var markdownEscapes = [[/\\/g, "\\\\"], [/\*/g, "\\*"], [/^-/g, "\\-"], [/^\+ /g, "\\+ "], [/^(=+)/g, "\\$1"], [/^(#{1,6}) /g, "\\$1 "], [/`/g, "\\`"], [/^~~~/g, "\\~~~"], [/\[/g, "\\["], [/\]/g, "\\]"], [/^>/g, "\\>"], [/_/g, "\\_"], [/^(\d+)\. /g, "$1\\. "]];
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function escapeMarkdown(string) {
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return markdownEscapes.reduce(function(accumulator, escape) {
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return accumulator.replace(escape[0], escape[1]);
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}, string);
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}
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var rules = {};
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rules.paragraph = {
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filter: "p",
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replacement: function(content) {
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return "\n\n" + content + "\n\n";
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}
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};
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rules.lineBreak = {
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filter: "br",
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replacement: function(content, node, options) {
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return options.br + "\n";
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}
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};
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rules.heading = {
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filter: ["h1", "h2", "h3", "h4", "h5", "h6"],
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replacement: function(content, node, options) {
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var hLevel = Number(node.nodeName.charAt(1));
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if (options.headingStyle === "setext" && hLevel < 3) {
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var underline = repeat(hLevel === 1 ? "=" : "-", content.length);
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return "\n\n" + content + "\n" + underline + "\n\n";
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} else {
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return "\n\n" + repeat("#", hLevel) + " " + content + "\n\n";
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}
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}
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};
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rules.blockquote = {
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filter: "blockquote",
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replacement: function(content) {
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content = trimNewlines(content).replace(/^/gm, "> ");
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return "\n\n" + content + "\n\n";
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}
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};
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rules.list = {
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filter: ["ul", "ol"],
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replacement: function(content, node) {
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var parent = node.parentNode;
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if (parent.nodeName === "LI" && parent.lastElementChild === node) {
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return "\n" + content;
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} else {
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return "\n\n" + content + "\n\n";
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}
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}
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};
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rules.listItem = {
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filter: "li",
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replacement: function(content, node, options) {
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var prefix = options.bulletListMarker + " ";
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var parent = node.parentNode;
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if (parent.nodeName === "OL") {
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var start = parent.getAttribute("start");
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var index = Array.prototype.indexOf.call(parent.children, node);
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prefix = (start ? Number(start) + index : index + 1) + ". ";
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}
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var isParagraph = /\n$/.test(content);
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content = trimNewlines(content) + (isParagraph ? "\n" : "");
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content = content.replace(/\n/gm, "\n" + " ".repeat(prefix.length));
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return prefix + content + (node.nextSibling ? "\n" : "");
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}
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};
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rules.indentedCodeBlock = {
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filter: function(node, options) {
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return options.codeBlockStyle === "indented" && node.nodeName === "PRE" && node.firstChild && node.firstChild.nodeName === "CODE";
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},
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replacement: function(content, node, options) {
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return "\n\n " + node.firstChild.textContent.replace(/\n/g, "\n ") + "\n\n";
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}
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};
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rules.fencedCodeBlock = {
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filter: function(node, options) {
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return options.codeBlockStyle === "fenced" && node.nodeName === "PRE" && node.firstChild && node.firstChild.nodeName === "CODE";
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},
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replacement: function(content, node, options) {
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var className = node.firstChild.getAttribute("class") || "";
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var language = (className.match(/language-(\S+)/) || [null, ""])[1];
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var code = node.firstChild.textContent;
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var fenceChar = options.fence.charAt(0);
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var fenceSize = 3;
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var fenceInCodeRegex = new RegExp("^" + fenceChar + "{3,}", "gm");
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var match;
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while (match = fenceInCodeRegex.exec(code)) {
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if (match[0].length >= fenceSize) {
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fenceSize = match[0].length + 1;
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}
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}
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var fence = repeat(fenceChar, fenceSize);
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return "\n\n" + fence + language + "\n" + code.replace(/\n$/, "") + "\n" + fence + "\n\n";
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}
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};
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rules.horizontalRule = {
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filter: "hr",
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replacement: function(content, node, options) {
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return "\n\n" + options.hr + "\n\n";
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}
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};
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rules.inlineLink = {
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filter: function(node, options) {
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return options.linkStyle === "inlined" && node.nodeName === "A" && node.getAttribute("href");
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},
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replacement: function(content, node) {
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var href = escapeLinkDestination(node.getAttribute("href"));
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var title = escapeLinkTitle(cleanAttribute(node.getAttribute("title")));
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var titlePart = title ? ' "' + title + '"' : "";
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return "[" + content + "](" + href + titlePart + ")";
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}
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};
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rules.referenceLink = {
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filter: function(node, options) {
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return options.linkStyle === "referenced" && node.nodeName === "A" && node.getAttribute("href");
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},
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replacement: function(content, node, options) {
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var href = escapeLinkDestination(node.getAttribute("href"));
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var title = cleanAttribute(node.getAttribute("title"));
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if (title) title = ' "' + escapeLinkTitle(title) + '"';
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var replacement;
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var reference;
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switch (options.linkReferenceStyle) {
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case "collapsed":
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replacement = "[" + content + "][]";
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reference = "[" + content + "]: " + href + title;
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break;
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case "shortcut":
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replacement = "[" + content + "]";
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reference = "[" + content + "]: " + href + title;
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break;
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default:
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var id = this.references.length + 1;
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replacement = "[" + content + "][" + id + "]";
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reference = "[" + id + "]: " + href + title;
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}
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this.references.push(reference);
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return replacement;
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},
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references: [],
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append: function(options) {
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var references = "";
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if (this.references.length) {
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references = "\n\n" + this.references.join("\n") + "\n\n";
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this.references = [];
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}
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return references;
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}
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};
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rules.emphasis = {
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filter: ["em", "i"],
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replacement: function(content, node, options) {
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if (!content.trim()) return "";
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return options.emDelimiter + content + options.emDelimiter;
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}
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};
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rules.strong = {
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filter: ["strong", "b"],
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replacement: function(content, node, options) {
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if (!content.trim()) return "";
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return options.strongDelimiter + content + options.strongDelimiter;
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}
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};
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rules.code = {
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filter: function(node) {
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var hasSiblings = node.previousSibling || node.nextSibling;
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var isCodeBlock = node.parentNode.nodeName === "PRE" && !hasSiblings;
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return node.nodeName === "CODE" && !isCodeBlock;
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},
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replacement: function(content) {
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if (!content) return "";
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content = content.replace(/\r?\n|\r/g, " ");
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var extraSpace = /^`|^ .*?[^ ].* $|`$/.test(content) ? " " : "";
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var delimiter = "`";
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var matches = content.match(/`+/gm) || [];
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while (matches.indexOf(delimiter) !== -1) delimiter = delimiter + "`";
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return delimiter + extraSpace + content + extraSpace + delimiter;
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}
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};
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rules.image = {
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filter: "img",
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replacement: function(content, node) {
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var alt = escapeMarkdown(cleanAttribute(node.getAttribute("alt")));
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var src = escapeLinkDestination(node.getAttribute("src") || "");
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var title = cleanAttribute(node.getAttribute("title"));
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var titlePart = title ? ' "' + escapeLinkTitle(title) + '"' : "";
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return src ? "![" + alt + "](" + src + titlePart + ")" : "";
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}
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};
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function cleanAttribute(attribute) {
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return attribute ? attribute.replace(/(\n+\s*)+/g, "\n") : "";
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}
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function escapeLinkDestination(destination) {
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var escaped = destination.replace(/([<>()])/g, "\\$1");
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return escaped.indexOf(" ") >= 0 ? "<" + escaped + ">" : escaped;
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}
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function escapeLinkTitle(title) {
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return title.replace(/"/g, '\\"');
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}
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function Rules(options) {
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this.options = options;
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this._keep = [];
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this._remove = [];
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this.blankRule = {
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replacement: options.blankReplacement
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};
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this.keepReplacement = options.keepReplacement;
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this.defaultRule = {
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replacement: options.defaultReplacement
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};
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this.array = [];
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for (var key in options.rules) this.array.push(options.rules[key]);
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}
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Rules.prototype = {
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add: function(key, rule) {
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this.array.unshift(rule);
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},
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keep: function(filter) {
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this._keep.unshift({
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filter,
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replacement: this.keepReplacement
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});
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},
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remove: function(filter) {
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this._remove.unshift({
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filter,
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replacement: function() {
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return "";
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}
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});
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},
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forNode: function(node) {
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if (node.isBlank) return this.blankRule;
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var rule;
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if (rule = findRule(this.array, node, this.options)) return rule;
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if (rule = findRule(this._keep, node, this.options)) return rule;
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if (rule = findRule(this._remove, node, this.options)) return rule;
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return this.defaultRule;
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},
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forEach: function(fn) {
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for (var i = 0; i < this.array.length; i++) fn(this.array[i], i);
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}
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};
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function findRule(rules2, node, options) {
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for (var i = 0; i < rules2.length; i++) {
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var rule = rules2[i];
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if (filterValue(rule, node, options)) return rule;
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}
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return void 0;
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}
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function filterValue(rule, node, options) {
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var filter = rule.filter;
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if (typeof filter === "string") {
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if (filter === node.nodeName.toLowerCase()) return true;
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} else if (Array.isArray(filter)) {
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if (filter.indexOf(node.nodeName.toLowerCase()) > -1) return true;
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} else if (typeof filter === "function") {
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if (filter.call(rule, node, options)) return true;
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} else {
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throw new TypeError("`filter` needs to be a string, array, or function");
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}
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}
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function collapseWhitespace(options) {
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var element = options.element;
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var isBlock2 = options.isBlock;
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var isVoid2 = options.isVoid;
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var isPre = options.isPre || function(node2) {
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return node2.nodeName === "PRE";
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};
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if (!element.firstChild || isPre(element)) return;
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var prevText = null;
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var keepLeadingWs = false;
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var prev = null;
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var node = next(prev, element, isPre);
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while (node !== element) {
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if (node.nodeType === 3 || node.nodeType === 4) {
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var text = node.data.replace(/[ \r\n\t]+/g, " ");
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if ((!prevText || / $/.test(prevText.data)) && !keepLeadingWs && text[0] === " ") {
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text = text.substr(1);
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}
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if (!text) {
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node = remove(node);
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continue;
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}
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node.data = text;
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prevText = node;
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} else if (node.nodeType === 1) {
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if (isBlock2(node) || node.nodeName === "BR") {
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if (prevText) {
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prevText.data = prevText.data.replace(/ $/, "");
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}
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prevText = null;
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keepLeadingWs = false;
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} else if (isVoid2(node) || isPre(node)) {
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prevText = null;
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keepLeadingWs = true;
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} else if (prevText) {
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keepLeadingWs = false;
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}
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} else {
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node = remove(node);
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continue;
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}
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var nextNode = next(prev, node, isPre);
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prev = node;
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node = nextNode;
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}
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if (prevText) {
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prevText.data = prevText.data.replace(/ $/, "");
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if (!prevText.data) {
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remove(prevText);
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}
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}
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}
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function remove(node) {
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var next2 = node.nextSibling || node.parentNode;
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node.parentNode.removeChild(node);
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return next2;
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}
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function next(prev, current, isPre) {
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if (prev && prev.parentNode === current || isPre(current)) {
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return current.nextSibling || current.parentNode;
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}
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return current.firstChild || current.nextSibling || current.parentNode;
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}
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var root = typeof window !== "undefined" ? window : {};
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function canParseHTMLNatively() {
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var Parser = root.DOMParser;
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var canParse = false;
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try {
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if (new Parser().parseFromString("", "text/html")) {
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canParse = true;
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}
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} catch (e) {
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}
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return canParse;
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}
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function createHTMLParser() {
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var Parser = function() {
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};
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{
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var domino = require("@mixmark-io/domino");
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Parser.prototype.parseFromString = function(string) {
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return domino.createDocument(string);
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};
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}
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return Parser;
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}
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var HTMLParser = canParseHTMLNatively() ? root.DOMParser : createHTMLParser();
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function RootNode(input, options) {
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var root2;
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if (typeof input === "string") {
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var doc = htmlParser().parseFromString(
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// DOM parsers arrange elements in the <head> and <body>.
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// Wrapping in a custom element ensures elements are reliably arranged in
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// a single element.
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'<x-turndown id="turndown-root">' + input + "</x-turndown>",
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"text/html"
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);
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root2 = doc.getElementById("turndown-root");
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} else {
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root2 = input.cloneNode(true);
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}
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collapseWhitespace({
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element: root2,
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isBlock,
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isVoid,
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isPre: options.preformattedCode ? isPreOrCode : null
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});
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return root2;
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}
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var _htmlParser;
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function htmlParser() {
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_htmlParser = _htmlParser || new HTMLParser();
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return _htmlParser;
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}
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function isPreOrCode(node) {
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return node.nodeName === "PRE" || node.nodeName === "CODE";
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}
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function Node(node, options) {
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node.isBlock = isBlock(node);
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node.isCode = node.nodeName === "CODE" || node.parentNode.isCode;
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node.isBlank = isBlank(node);
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node.flankingWhitespace = flankingWhitespace(node, options);
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return node;
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}
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function isBlank(node) {
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return !isVoid(node) && !isMeaningfulWhenBlank(node) && /^\s*$/i.test(node.textContent) && !hasVoid(node) && !hasMeaningfulWhenBlank(node);
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}
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function flankingWhitespace(node, options) {
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if (node.isBlock || options.preformattedCode && node.isCode) {
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return {
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leading: "",
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trailing: ""
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};
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}
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var edges = edgeWhitespace(node.textContent);
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if (edges.leadingAscii && isFlankedByWhitespace("left", node, options)) {
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edges.leading = edges.leadingNonAscii;
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}
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if (edges.trailingAscii && isFlankedByWhitespace("right", node, options)) {
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edges.trailing = edges.trailingNonAscii;
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}
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return {
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leading: edges.leading,
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trailing: edges.trailing
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};
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}
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function edgeWhitespace(string) {
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var m = string.match(/^(([ \t\r\n]*)(\s*))(?:(?=\S)[\s\S]*\S)?((\s*?)([ \t\r\n]*))$/);
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return {
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leading: m[1],
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// whole string for whitespace-only strings
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leadingAscii: m[2],
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leadingNonAscii: m[3],
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trailing: m[4],
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// empty for whitespace-only strings
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trailingNonAscii: m[5],
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trailingAscii: m[6]
|
|
};
|
|
}
|
|
function isFlankedByWhitespace(side, node, options) {
|
|
var sibling;
|
|
var regExp;
|
|
var isFlanked;
|
|
if (side === "left") {
|
|
sibling = node.previousSibling;
|
|
regExp = / $/;
|
|
} else {
|
|
sibling = node.nextSibling;
|
|
regExp = /^ /;
|
|
}
|
|
if (sibling) {
|
|
if (sibling.nodeType === 3) {
|
|
isFlanked = regExp.test(sibling.nodeValue);
|
|
} else if (options.preformattedCode && sibling.nodeName === "CODE") {
|
|
isFlanked = false;
|
|
} else if (sibling.nodeType === 1 && !isBlock(sibling)) {
|
|
isFlanked = regExp.test(sibling.textContent);
|
|
}
|
|
}
|
|
return isFlanked;
|
|
}
|
|
var reduce = Array.prototype.reduce;
|
|
function TurndownService(options) {
|
|
if (!(this instanceof TurndownService)) return new TurndownService(options);
|
|
var defaults = {
|
|
rules,
|
|
headingStyle: "setext",
|
|
hr: "* * *",
|
|
bulletListMarker: "*",
|
|
codeBlockStyle: "indented",
|
|
fence: "```",
|
|
emDelimiter: "_",
|
|
strongDelimiter: "**",
|
|
linkStyle: "inlined",
|
|
linkReferenceStyle: "full",
|
|
br: " ",
|
|
preformattedCode: false,
|
|
blankReplacement: function(content, node) {
|
|
return node.isBlock ? "\n\n" : "";
|
|
},
|
|
keepReplacement: function(content, node) {
|
|
return node.isBlock ? "\n\n" + node.outerHTML + "\n\n" : node.outerHTML;
|
|
},
|
|
defaultReplacement: function(content, node) {
|
|
return node.isBlock ? "\n\n" + content + "\n\n" : content;
|
|
}
|
|
};
|
|
this.options = extend({}, defaults, options);
|
|
this.rules = new Rules(this.options);
|
|
}
|
|
TurndownService.prototype = {
|
|
/**
|
|
* The entry point for converting a string or DOM node to Markdown
|
|
* @public
|
|
* @param {String|HTMLElement} input The string or DOM node to convert
|
|
* @returns A Markdown representation of the input
|
|
* @type String
|
|
*/
|
|
turndown: function(input) {
|
|
if (!canConvert(input)) {
|
|
throw new TypeError(input + " is not a string, or an element/document/fragment node.");
|
|
}
|
|
if (input === "") return "";
|
|
var output = process.call(this, new RootNode(input, this.options));
|
|
return postProcess.call(this, output);
|
|
},
|
|
/**
|
|
* Add one or more plugins
|
|
* @public
|
|
* @param {Function|Array} plugin The plugin or array of plugins to add
|
|
* @returns The Turndown instance for chaining
|
|
* @type Object
|
|
*/
|
|
use: function(plugin) {
|
|
if (Array.isArray(plugin)) {
|
|
for (var i = 0; i < plugin.length; i++) this.use(plugin[i]);
|
|
} else if (typeof plugin === "function") {
|
|
plugin(this);
|
|
} else {
|
|
throw new TypeError("plugin must be a Function or an Array of Functions");
|
|
}
|
|
return this;
|
|
},
|
|
/**
|
|
* Adds a rule
|
|
* @public
|
|
* @param {String} key The unique key of the rule
|
|
* @param {Object} rule The rule
|
|
* @returns The Turndown instance for chaining
|
|
* @type Object
|
|
*/
|
|
addRule: function(key, rule) {
|
|
this.rules.add(key, rule);
|
|
return this;
|
|
},
|
|
/**
|
|
* Keep a node (as HTML) that matches the filter
|
|
* @public
|
|
* @param {String|Array|Function} filter The unique key of the rule
|
|
* @returns The Turndown instance for chaining
|
|
* @type Object
|
|
*/
|
|
keep: function(filter) {
|
|
this.rules.keep(filter);
|
|
return this;
|
|
},
|
|
/**
|
|
* Remove a node that matches the filter
|
|
* @public
|
|
* @param {String|Array|Function} filter The unique key of the rule
|
|
* @returns The Turndown instance for chaining
|
|
* @type Object
|
|
*/
|
|
remove: function(filter) {
|
|
this.rules.remove(filter);
|
|
return this;
|
|
},
|
|
/**
|
|
* Escapes Markdown syntax
|
|
* @public
|
|
* @param {String} string The string to escape
|
|
* @returns A string with Markdown syntax escaped
|
|
* @type String
|
|
*/
|
|
escape: function(string) {
|
|
return escapeMarkdown(string);
|
|
}
|
|
};
|
|
function process(parentNode) {
|
|
var self = this;
|
|
return reduce.call(parentNode.childNodes, function(output, node) {
|
|
node = new Node(node, self.options);
|
|
var replacement = "";
|
|
if (node.nodeType === 3) {
|
|
replacement = node.isCode ? node.nodeValue : self.escape(node.nodeValue);
|
|
} else if (node.nodeType === 1) {
|
|
replacement = replacementForNode.call(self, node);
|
|
}
|
|
return join(output, replacement);
|
|
}, "");
|
|
}
|
|
function postProcess(output) {
|
|
var self = this;
|
|
this.rules.forEach(function(rule) {
|
|
if (typeof rule.append === "function") {
|
|
output = join(output, rule.append(self.options));
|
|
}
|
|
});
|
|
return output.replace(/^[\t\r\n]+/, "").replace(/[\t\r\n\s]+$/, "");
|
|
}
|
|
function replacementForNode(node) {
|
|
var rule = this.rules.forNode(node);
|
|
var content = process.call(this, node);
|
|
var whitespace = node.flankingWhitespace;
|
|
if (whitespace.leading || whitespace.trailing) content = content.trim();
|
|
return whitespace.leading + rule.replacement(content, node, this.options) + whitespace.trailing;
|
|
}
|
|
function join(output, replacement) {
|
|
var s1 = trimTrailingNewlines(output);
|
|
var s2 = trimLeadingNewlines(replacement);
|
|
var nls = Math.max(output.length - s1.length, replacement.length - s2.length);
|
|
var separator = "\n\n".substring(0, nls);
|
|
return s1 + separator + s2;
|
|
}
|
|
function canConvert(input) {
|
|
return input != null && (typeof input === "string" || input.nodeType && (input.nodeType === 1 || input.nodeType === 9 || input.nodeType === 11));
|
|
}
|
|
export {
|
|
TurndownService as default
|
|
};
|