Markdown parser, done right. 100% CommonMark support, extensions, syntax plugins & high speed
https://markdown-it.github.io/
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341 lines
8.9 KiB
341 lines
8.9 KiB
/**
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* class Renderer
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*
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* Generates HTML from parsed token stream. Each instance has independent
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* copy of rules. Those can be rewritten with ease. Also, you can add new
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* rules if you create plugin and adds new token types.
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**/
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'use strict';
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var assign = require('./common/utils').assign;
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var unescapeAll = require('./common/utils').unescapeAll;
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var escapeHtml = require('./common/utils').escapeHtml;
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////////////////////////////////////////////////////////////////////////////////
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var default_rules = {};
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default_rules.code_inline = function (tokens, idx, options, env, slf) {
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var token = tokens[idx];
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return '<code' + slf.renderAttrs(token) + '>' +
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escapeHtml(token.content) +
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'</code>';
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};
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default_rules.code_block = function (tokens, idx, options, env, slf) {
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var token = tokens[idx];
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return '<pre' + slf.renderAttrs(token) + '><code>' +
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escapeHtml(tokens[idx].content) +
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'</code></pre>\n';
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};
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default_rules.fence = function (tokens, idx, options, env, slf) {
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var token = tokens[idx],
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info = token.info ? unescapeAll(token.info).trim() : '',
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langName = '',
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langAttrs = '',
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highlighted, i, arr, tmpAttrs, tmpToken;
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if (info) {
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arr = info.split(/(\s+)/g);
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langName = arr[0];
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langAttrs = arr.slice(2).join('');
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}
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if (options.highlight) {
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highlighted = options.highlight(token.content, langName, langAttrs) || escapeHtml(token.content);
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} else {
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highlighted = escapeHtml(token.content);
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}
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if (highlighted.indexOf('<pre') === 0) {
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return highlighted + '\n';
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}
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// If language exists, inject class gently, without modifying original token.
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// May be, one day we will add .deepClone() for token and simplify this part, but
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// now we prefer to keep things local.
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if (info) {
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i = token.attrIndex('class');
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tmpAttrs = token.attrs ? token.attrs.slice() : [];
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if (i < 0) {
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tmpAttrs.push([ 'class', options.langPrefix + langName ]);
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} else {
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tmpAttrs[i] = tmpAttrs[i].slice();
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tmpAttrs[i][1] += ' ' + options.langPrefix + langName;
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}
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// Fake token just to render attributes
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tmpToken = {
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attrs: tmpAttrs
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};
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return '<pre><code' + slf.renderAttrs(tmpToken) + '>'
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+ highlighted
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+ '</code></pre>\n';
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}
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return '<pre><code' + slf.renderAttrs(token) + '>'
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+ highlighted
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+ '</code></pre>\n';
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};
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default_rules.image = function (tokens, idx, options, env, slf) {
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var token = tokens[idx];
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// "alt" attr MUST be set, even if empty. Because it's mandatory and
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// should be placed on proper position for tests.
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//
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// Replace content with actual value
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token.attrs[token.attrIndex('alt')][1] =
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slf.renderInlineAsText(token.children, options, env);
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return slf.renderToken(tokens, idx, options);
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};
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default_rules.hardbreak = function (tokens, idx, options /*, env */) {
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return options.xhtmlOut ? '<br />\n' : '<br>\n';
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};
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default_rules.softbreak = function (tokens, idx, options /*, env */) {
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return options.breaks ? (options.xhtmlOut ? '<br />\n' : '<br>\n') : '\n';
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};
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default_rules.text = function (tokens, idx /*, options, env */) {
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return escapeHtml(tokens[idx].content);
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};
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default_rules.html_block = function (tokens, idx /*, options, env */) {
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return tokens[idx].content;
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};
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default_rules.html_inline = function (tokens, idx /*, options, env */) {
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return tokens[idx].content;
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};
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/**
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* new Renderer()
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*
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* Creates new [[Renderer]] instance and fill [[Renderer#rules]] with defaults.
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**/
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function Renderer() {
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/**
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* Renderer#rules -> Object
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*
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* Contains render rules for tokens. Can be updated and extended.
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*
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* ##### Example
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*
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* ```javascript
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* var md = require('markdown-it')();
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*
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* md.renderer.rules.strong_open = function () { return '<b>'; };
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* md.renderer.rules.strong_close = function () { return '</b>'; };
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*
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* var result = md.renderInline(...);
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* ```
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*
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* Each rule is called as independent static function with fixed signature:
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*
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* ```javascript
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* function my_token_render(tokens, idx, options, env, renderer) {
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* // ...
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* return renderedHTML;
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* }
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* ```
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*
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* See [source code](https://github.com/markdown-it/markdown-it/blob/master/lib/renderer.js)
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* for more details and examples.
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**/
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this.rules = assign({}, default_rules);
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}
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/**
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* Renderer.renderAttrs(token) -> String
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*
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* Render token attributes to string.
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**/
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Renderer.prototype.renderAttrs = function renderAttrs(token) {
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var i, l, result;
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if (!token.attrs) { return ''; }
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result = '';
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for (i = 0, l = token.attrs.length; i < l; i++) {
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result += ' ' + escapeHtml(token.attrs[i][0]) + '="' + escapeHtml(token.attrs[i][1]) + '"';
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}
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return result;
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};
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/**
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* Renderer.renderToken(tokens, idx, options) -> String
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* - tokens (Array): list of tokens
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* - idx (Numbed): token index to render
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* - options (Object): params of parser instance
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*
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* Default token renderer. Can be overriden by custom function
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* in [[Renderer#rules]].
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**/
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Renderer.prototype.renderToken = function renderToken(tokens, idx, options) {
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var nextToken,
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result = '',
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needLf = false,
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token = tokens[idx];
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// Tight list paragraphs
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if (token.hidden) {
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return '';
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}
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// Insert a newline between hidden paragraph and subsequent opening
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// block-level tag.
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//
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// For example, here we should insert a newline before blockquote:
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// - a
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// >
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//
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if (token.block && token.nesting !== -1 && idx && tokens[idx - 1].hidden) {
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result += '\n';
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}
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// Add token name, e.g. `<img`
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result += (token.nesting === -1 ? '</' : '<') + token.tag;
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// Encode attributes, e.g. `<img src="foo"`
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result += this.renderAttrs(token);
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// Add a slash for self-closing tags, e.g. `<img src="foo" /`
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if (token.nesting === 0 && options.xhtmlOut) {
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result += ' /';
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}
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// Check if we need to add a newline after this tag
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if (token.block) {
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needLf = true;
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if (token.nesting === 1) {
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if (idx + 1 < tokens.length) {
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nextToken = tokens[idx + 1];
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if (nextToken.type === 'inline' || nextToken.hidden) {
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// Block-level tag containing an inline tag.
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//
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needLf = false;
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} else if (nextToken.nesting === -1 && nextToken.tag === token.tag) {
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// Opening tag + closing tag of the same type. E.g. `<li></li>`.
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//
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needLf = false;
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}
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}
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}
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}
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result += needLf ? '>\n' : '>';
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return result;
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};
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/**
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* Renderer.renderInline(tokens, options, env) -> String
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* - tokens (Array): list on block tokens to render
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* - options (Object): params of parser instance
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* - env (Object): additional data from parsed input (references, for example)
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*
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* The same as [[Renderer.render]], but for single token of `inline` type.
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**/
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Renderer.prototype.renderInline = function (tokens, options, env) {
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var type,
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result = '',
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rules = this.rules;
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for (var i = 0, len = tokens.length; i < len; i++) {
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type = tokens[i].type;
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if (typeof rules[type] !== 'undefined') {
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result += rules[type](tokens, i, options, env, this);
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} else {
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result += this.renderToken(tokens, i, options);
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}
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}
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return result;
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};
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/** internal
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* Renderer.renderInlineAsText(tokens, options, env) -> String
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* - tokens (Array): list on block tokens to render
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* - options (Object): params of parser instance
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* - env (Object): additional data from parsed input (references, for example)
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*
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* Special kludge for image `alt` attributes to conform CommonMark spec.
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* Don't try to use it! Spec requires to show `alt` content with stripped markup,
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* instead of simple escaping.
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**/
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Renderer.prototype.renderInlineAsText = function (tokens, options, env) {
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var result = '';
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for (var i = 0, len = tokens.length; i < len; i++) {
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if (tokens[i].type === 'text') {
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result += tokens[i].content;
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} else if (tokens[i].type === 'image') {
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result += this.renderInlineAsText(tokens[i].children, options, env);
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} else if (tokens[i].type === 'softbreak') {
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result += '\n';
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}
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}
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return result;
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};
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/**
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* Renderer.render(tokens, options, env) -> String
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* - tokens (Array): list on block tokens to render
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* - options (Object): params of parser instance
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* - env (Object): additional data from parsed input (references, for example)
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*
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* Takes token stream and generates HTML. Probably, you will never need to call
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* this method directly.
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**/
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Renderer.prototype.render = function (tokens, options, env) {
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var i, len, type,
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result = '',
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rules = this.rules;
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for (i = 0, len = tokens.length; i < len; i++) {
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type = tokens[i].type;
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if (type === 'inline') {
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result += this.renderInline(tokens[i].children, options, env);
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} else if (typeof rules[type] !== 'undefined') {
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result += rules[type](tokens, i, options, env, this);
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} else {
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result += this.renderToken(tokens, i, options, env);
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}
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}
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return result;
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};
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module.exports = Renderer;
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