598 lines
18 KiB
JavaScript
598 lines
18 KiB
JavaScript
import guid from 'pretty-text/guid';
|
|
import { default as WhiteLister, whiteListFeature } from 'pretty-text/white-lister';
|
|
import { escape } from 'pretty-text/sanitizer';
|
|
|
|
var parser = window.BetterMarkdown,
|
|
MD = parser.Markdown,
|
|
DialectHelpers = parser.DialectHelpers,
|
|
hoisted;
|
|
|
|
let currentOpts;
|
|
|
|
const emitters = [];
|
|
const preProcessors = [];
|
|
const parseNodes = [];
|
|
|
|
function findEndPos(text, start, stop, args, offset) {
|
|
let endPos, nextStart;
|
|
do {
|
|
endPos = text.indexOf(stop, offset);
|
|
if (endPos === -1) { return -1; }
|
|
nextStart = text.indexOf(start, offset);
|
|
offset = endPos + stop.length;
|
|
} while (nextStart !== -1 && nextStart < endPos);
|
|
return endPos;
|
|
}
|
|
|
|
class DialectHelper {
|
|
constructor() {
|
|
this._dialect = MD.dialects.Discourse = DialectHelpers.subclassDialect(MD.dialects.Gruber);
|
|
this._setup = false;
|
|
}
|
|
|
|
escape(str) {
|
|
return escape(str);
|
|
}
|
|
|
|
getOptions() {
|
|
return currentOpts;
|
|
}
|
|
|
|
registerInlineFeature(featureName, start, fn) {
|
|
this._dialect.inline[start] = function() {
|
|
if (!currentOpts.features[featureName]) { return; }
|
|
return fn.apply(this, arguments);
|
|
};
|
|
}
|
|
|
|
addPreProcessorFeature(featureName, fn) {
|
|
preProcessors.push(raw => {
|
|
if (!currentOpts.features[featureName]) { return raw; }
|
|
return fn(raw, hoister);
|
|
});
|
|
}
|
|
|
|
/**
|
|
The simplest kind of replacement possible. Replace a stirng token with JsonML.
|
|
|
|
For example to replace all occurrances of :) with a smile image:
|
|
|
|
```javascript
|
|
helper.inlineReplace(':)', text => ['img', {src: '/images/smile.png'}]);
|
|
```
|
|
**/
|
|
inlineReplaceFeature(featureName, token, emitter) {
|
|
this.registerInline(token, (text, match, prev) => {
|
|
if (!currentOpts.features[featureName]) { return; }
|
|
return [token.length, emitter.call(this, token, match, prev)];
|
|
});
|
|
}
|
|
|
|
/**
|
|
After the parser has been executed, change the contents of a HTML tag.
|
|
|
|
Let's say you want to replace the contents of all code tags to prepend
|
|
"EVIL TROUT HACKED YOUR CODE!":
|
|
|
|
```javascript
|
|
helper.postProcessTag('code', contents => `EVIL TROUT HACKED YOUR CODE!\n\n${contents}`);
|
|
```
|
|
**/
|
|
postProcessTagFeature(featureName, tag, emitter) {
|
|
this.onParseNode(event => {
|
|
if (!currentOpts.features[featureName]) { return; }
|
|
const node = event.node;
|
|
if (node[0] === tag) {
|
|
node[node.length-1] = emitter(node[node.length-1]);
|
|
}
|
|
});
|
|
}
|
|
|
|
/**
|
|
Matches inline using a regular expression. The emitter function is passed
|
|
the matches from the regular expression.
|
|
|
|
For example, this auto links URLs:
|
|
|
|
```javascript
|
|
helper.inlineRegexp({
|
|
matcher: /((?:https?:(?:\/{1,3}|[a-z0-9%])|www\d{0,3}[.])(?:[^\s()<>]+|\([^\s()<>]+\))+(?:\([^\s()<>]+\)|[^`!()\[\]{};:'".,<>?«»“”‘’\s]))/gm,
|
|
spaceBoundary: true,
|
|
start: 'http',
|
|
|
|
emitter(matches) {
|
|
const url = matches[1];
|
|
return ['a', {href: url}, url];
|
|
}
|
|
});
|
|
```
|
|
**/
|
|
inlineRegexpFeature(featureName, args) {
|
|
this.registerInline(args.start, function(text, match, prev) {
|
|
if (!currentOpts.features[featureName]) { return; }
|
|
if (invalidBoundary(args, prev)) { return; }
|
|
|
|
args.matcher.lastIndex = 0;
|
|
const m = args.matcher.exec(text);
|
|
if (m) {
|
|
const result = args.emitter.call(this, m);
|
|
if (result) {
|
|
return [m[0].length, result];
|
|
}
|
|
}
|
|
});
|
|
}
|
|
|
|
/**
|
|
Handles inline replacements surrounded by tokens.
|
|
|
|
For example, to handle markdown style bold. Note we use `concat` on the array because
|
|
the contents are JsonML too since we didn't pass `rawContents` as true. This supports
|
|
recursive markup.
|
|
|
|
```javascript
|
|
helper.inlineBetween({
|
|
between: '**',
|
|
wordBoundary: true.
|
|
emitter(contents) {
|
|
return ['strong'].concat(contents);
|
|
}
|
|
});
|
|
```
|
|
**/
|
|
inlineBetweenFeature(featureName, args) {
|
|
const start = args.start || args.between;
|
|
const stop = args.stop || args.between;
|
|
const startLength = start.length;
|
|
|
|
this.registerInline(start, function(text, match, prev) {
|
|
if (!currentOpts.features[featureName]) { return; }
|
|
if (invalidBoundary(args, prev)) { return; }
|
|
|
|
const endPos = findEndPos(text, start, stop, args, startLength);
|
|
if (endPos === -1) { return; }
|
|
var between = text.slice(startLength, endPos);
|
|
|
|
// If rawcontents is set, don't process inline
|
|
if (!args.rawContents) {
|
|
between = this.processInline(between);
|
|
}
|
|
|
|
var contents = args.emitter.call(this, between);
|
|
if (contents) {
|
|
return [endPos+stop.length, contents];
|
|
}
|
|
});
|
|
}
|
|
|
|
/**
|
|
Replaces a block of text between a start and stop. As opposed to inline, these
|
|
might span multiple lines.
|
|
|
|
Here's an example that takes the content between `[code]` ... `[/code]` and
|
|
puts them inside a `pre` tag:
|
|
|
|
```javascript
|
|
helper.replaceBlock({
|
|
start: /(\[code\])([\s\S]*)/igm,
|
|
stop: '[/code]',
|
|
rawContents: true,
|
|
|
|
emitter(blockContents) {
|
|
return ['p', ['pre'].concat(blockContents)];
|
|
}
|
|
});
|
|
```
|
|
**/
|
|
replaceBlockFeature(featureName, args) {
|
|
function blockFunc(block, next) {
|
|
if (!currentOpts.features[featureName]) { return; }
|
|
|
|
const linebreaks = currentOpts.traditionalMarkdownLinebreaks;
|
|
if (linebreaks && args.skipIfTradtionalLinebreaks) { return; }
|
|
|
|
args.start.lastIndex = 0;
|
|
const result = [];
|
|
const match = (args.start).exec(block);
|
|
if (!match) { return; }
|
|
|
|
const lastChance = () => !next.some(blk => blk.match(args.stop));
|
|
|
|
// shave off start tag and leading text, if any.
|
|
const pos = args.start.lastIndex - match[0].length;
|
|
const leading = block.slice(0, pos);
|
|
const trailing = match[2] ? match[2].replace(/^\n*/, "") : "";
|
|
|
|
// The other leading block should be processed first! eg a code block wrapped around a code block.
|
|
if (args.withoutLeading && args.withoutLeading.test(leading)) {
|
|
return;
|
|
}
|
|
|
|
// just give up if there's no stop tag in this or any next block
|
|
args.stop.lastIndex = block.length - trailing.length;
|
|
if (!args.stop.exec(block) && lastChance()) { return; }
|
|
if (leading.length > 0) {
|
|
var parsedLeading = this.processBlock(MD.mk_block(leading), []);
|
|
if (parsedLeading && parsedLeading[0]) {
|
|
result.push(parsedLeading[0]);
|
|
}
|
|
}
|
|
if (trailing.length > 0) {
|
|
next.unshift(MD.mk_block(trailing, block.trailing,
|
|
block.lineNumber + countLines(leading) + (match[2] ? match[2].length : 0) - trailing.length));
|
|
}
|
|
|
|
// go through the available blocks to find the matching stop tag.
|
|
const contentBlocks = [];
|
|
let nesting = 0;
|
|
let actualEndPos = -1;
|
|
let currentBlock;
|
|
|
|
blockloop:
|
|
while (currentBlock = next.shift()) {
|
|
|
|
// collect all the start and stop tags in the current block
|
|
args.start.lastIndex = 0;
|
|
const startPos = [];
|
|
let m;
|
|
while (m = (args.start).exec(currentBlock)) {
|
|
startPos.push(args.start.lastIndex - m[0].length);
|
|
args.start.lastIndex = args.start.lastIndex - (m[2] ? m[2].length : 0);
|
|
}
|
|
args.stop.lastIndex = 0;
|
|
const endPos = [];
|
|
while (m = (args.stop).exec(currentBlock)) {
|
|
endPos.push(args.stop.lastIndex - m[0].length);
|
|
}
|
|
|
|
// go through the available end tags:
|
|
let ep = 0;
|
|
let sp = 0;
|
|
while (ep < endPos.length) {
|
|
if (sp < startPos.length && startPos[sp] < endPos[ep]) {
|
|
// there's an end tag, but there's also another start tag first. we need to go deeper.
|
|
sp++; nesting++;
|
|
} else if (nesting > 0) {
|
|
// found an end tag, but we must go up a level first.
|
|
ep++; nesting--;
|
|
} else {
|
|
// found an end tag and we're at the top: done! -- or: start tag and end tag are
|
|
// identical, (i.e. startPos[sp] == endPos[ep]), so we don't do nesting at all.
|
|
actualEndPos = endPos[ep];
|
|
break blockloop;
|
|
}
|
|
}
|
|
|
|
if (lastChance()) {
|
|
// when lastChance() becomes true the first time, currentBlock contains the last
|
|
// end tag available in the input blocks but it's not on the right nesting level
|
|
// or we would have terminated the loop already. the only thing we can do is to
|
|
// treat the last available end tag as tho it were matched with our start tag
|
|
// and let the emitter figure out how to render the garbage inside.
|
|
actualEndPos = endPos[endPos.length - 1];
|
|
break;
|
|
}
|
|
|
|
// any left-over start tags still increase the nesting level
|
|
nesting += startPos.length - sp;
|
|
contentBlocks.push(currentBlock);
|
|
}
|
|
|
|
const stopLen = currentBlock.match(args.stop)[0].length;
|
|
const before = currentBlock.slice(0, actualEndPos).replace(/\n*$/, "");
|
|
const after = currentBlock.slice(actualEndPos + stopLen).replace(/^\n*/, "");
|
|
if (before.length > 0) contentBlocks.push(MD.mk_block(before, "", currentBlock.lineNumber));
|
|
if (after.length > 0) next.unshift(MD.mk_block(after, currentBlock.trailing, currentBlock.lineNumber + countLines(before)));
|
|
|
|
const emitterResult = args.emitter.call(this, contentBlocks, match);
|
|
if (emitterResult) { result.push(emitterResult); }
|
|
return result;
|
|
};
|
|
|
|
if (args.priority) {
|
|
blockFunc.priority = args.priority;
|
|
}
|
|
|
|
this.registerBlock(args.start.toString(), blockFunc);
|
|
}
|
|
|
|
/**
|
|
After the parser has been executed, post process any text nodes in the HTML document.
|
|
This is useful if you want to apply a transformation to the text.
|
|
|
|
If you are generating HTML from the text, it is preferable to use the replacer
|
|
functions and do it in the parsing part of the pipeline. This function is best for
|
|
simple transformations or transformations that have to happen after all earlier
|
|
processing is done.
|
|
|
|
For example, to convert all text to upper case:
|
|
|
|
```javascript
|
|
helper.postProcessText(function (text) {
|
|
return text.toUpperCase();
|
|
});
|
|
```
|
|
**/
|
|
postProcessTextFeature(featureName, fn) {
|
|
emitters.push(function () {
|
|
if (!currentOpts.features[featureName]) { return; }
|
|
return fn.apply(this, arguments);
|
|
});
|
|
}
|
|
|
|
onParseNodeFeature(featureName, fn) {
|
|
parseNodes.push(function () {
|
|
if (!currentOpts.features[featureName]) { return; }
|
|
return fn.apply(this, arguments);
|
|
});
|
|
}
|
|
|
|
registerBlockFeature(featureName, name, fn) {
|
|
const blockFunc = function() {
|
|
if (!currentOpts.features[featureName]) { return; }
|
|
return fn.apply(this, arguments);
|
|
};
|
|
|
|
blockFunc.priority = fn.priority;
|
|
this._dialect.block[name] = blockFunc;
|
|
}
|
|
|
|
applyFeature(featureName, module) {
|
|
helper.registerInline = (code, fn) => helper.registerInlineFeature(featureName, code, fn);
|
|
helper.replaceBlock = args => helper.replaceBlockFeature(featureName, args);
|
|
helper.addPreProcessor = fn => helper.addPreProcessorFeature(featureName, fn);
|
|
helper.inlineReplace = (token, emitter) => helper.inlineReplaceFeature(featureName, token, emitter);
|
|
helper.postProcessTag = (token, emitter) => helper.postProcessTagFeature(featureName, token, emitter);
|
|
helper.inlineRegexp = args => helper.inlineRegexpFeature(featureName, args);
|
|
helper.inlineBetween = args => helper.inlineBetweenFeature(featureName, args);
|
|
helper.postProcessText = fn => helper.postProcessTextFeature(featureName, fn);
|
|
helper.onParseNode = fn => helper.onParseNodeFeature(featureName, fn);
|
|
helper.registerBlock = (name, fn) => helper.registerBlockFeature(featureName, name, fn);
|
|
|
|
module.setup(this);
|
|
}
|
|
|
|
setup() {
|
|
if (this._setup) { return; }
|
|
this._setup = true;
|
|
|
|
Object.keys(require._eak_seen).forEach(entry => {
|
|
if (entry.indexOf('discourse-markdown') !== -1) {
|
|
const module = require(entry);
|
|
if (module && module.setup) {
|
|
const featureName = entry.split('/').reverse()[0];
|
|
helper.whiteList = info => whiteListFeature(featureName, info);
|
|
|
|
this.applyFeature(featureName, module);
|
|
helper.whiteList = undefined;
|
|
}
|
|
}
|
|
});
|
|
|
|
MD.buildBlockOrder(this._dialect.block);
|
|
var index = this._dialect.block.__order__.indexOf("code");
|
|
if (index > -1) {
|
|
this._dialect.block.__order__.splice(index, 1);
|
|
this._dialect.block.__order__.unshift("code");
|
|
}
|
|
MD.buildInlinePatterns(this._dialect.inline);
|
|
}
|
|
};
|
|
|
|
const helper = new DialectHelper();
|
|
|
|
export function cook(raw, opts) {
|
|
currentOpts = opts;
|
|
|
|
hoisted = {};
|
|
|
|
if (!currentOpts.enableExperimentalMarkdownIt) {
|
|
raw = hoistCodeBlocksAndSpans(raw);
|
|
preProcessors.forEach(p => raw = p(raw));
|
|
}
|
|
|
|
const whiteLister = new WhiteLister(opts);
|
|
|
|
let result;
|
|
|
|
if (currentOpts.enableExperimentalMarkdownIt) {
|
|
result = opts.sanitizer(
|
|
require('pretty-text/engines/markdown-it/instance').default(opts).render(raw),
|
|
whiteLister
|
|
);
|
|
} else {
|
|
const tree = parser.toHTMLTree(raw, 'Discourse');
|
|
result = opts.sanitizer(parser.renderJsonML(parseTree(tree, opts)), whiteLister);
|
|
}
|
|
|
|
// If we hoisted out anything, put it back
|
|
const keys = Object.keys(hoisted);
|
|
if (keys.length) {
|
|
let found = true;
|
|
|
|
const unhoist = function(key) {
|
|
result = result.replace(new RegExp(key, "g"), function() {
|
|
found = true;
|
|
return hoisted[key];
|
|
});
|
|
};
|
|
|
|
while (found) {
|
|
found = false;
|
|
keys.forEach(unhoist);
|
|
}
|
|
}
|
|
|
|
return result.trim();
|
|
}
|
|
|
|
export function setup() {
|
|
helper.setup();
|
|
}
|
|
|
|
function processTextNodes(node, event, emitter) {
|
|
if (node.length < 2) { return; }
|
|
|
|
if (node[0] === '__RAW') {
|
|
const hash = guid();
|
|
hoisted[hash] = node[1];
|
|
node[1] = hash;
|
|
return;
|
|
}
|
|
|
|
for (var j=1; j<node.length; j++) {
|
|
var textContent = node[j];
|
|
if (typeof textContent === "string") {
|
|
var result = emitter(textContent, event);
|
|
if (result) {
|
|
if (result instanceof Array) {
|
|
node.splice.apply(node, [j, 1].concat(result));
|
|
} else {
|
|
node[j] = result;
|
|
}
|
|
} else {
|
|
node[j] = textContent;
|
|
}
|
|
|
|
}
|
|
}
|
|
}
|
|
|
|
// Parse a JSON ML tree, using registered handlers to adjust it if necessary.
|
|
function parseTree(tree, options, path, insideCounts) {
|
|
|
|
if (tree instanceof Array) {
|
|
const event = {node: tree, options, path, insideCounts: insideCounts || {}};
|
|
parseNodes.forEach(fn => fn(event));
|
|
|
|
for (var j=0; j<emitters.length; j++) {
|
|
processTextNodes(tree, event, emitters[j]);
|
|
}
|
|
|
|
path = path || [];
|
|
insideCounts = insideCounts || {};
|
|
|
|
path.push(tree);
|
|
|
|
for (var i=1; i<tree.length; i++) {
|
|
var n = tree[i],
|
|
tagName = n[0];
|
|
|
|
insideCounts[tagName] = (insideCounts[tagName] || 0) + 1;
|
|
|
|
if (n && n.length === 2 && n[0] === "p" && /^<!--([\s\S]*)-->$/.exec(n[1])) {
|
|
// Remove paragraphs around comment-only nodes.
|
|
tree[i] = n[1];
|
|
} else {
|
|
parseTree(n, options, path, insideCounts);
|
|
}
|
|
|
|
insideCounts[tagName] = insideCounts[tagName] - 1;
|
|
}
|
|
|
|
// If raw nodes are in paragraphs, pull them up
|
|
if (tree.length === 2 && tree[0] === 'p' && tree[1] instanceof Array && tree[1][0] === "__RAW") {
|
|
var text = tree[1][1];
|
|
tree[0] = "__RAW";
|
|
tree[1] = text;
|
|
}
|
|
|
|
path.pop();
|
|
}
|
|
return tree;
|
|
}
|
|
|
|
// Returns true if there's an invalid word boundary for a match.
|
|
function invalidBoundary(args, prev) {
|
|
if (!(args.wordBoundary || args.spaceBoundary || args.spaceOrTagBoundary)) { return false; }
|
|
|
|
var last = prev[prev.length - 1];
|
|
if (typeof last !== "string") { return false; }
|
|
|
|
if (args.wordBoundary && (!last.match(/\W$/))) { return true; }
|
|
if (args.spaceBoundary && (!last.match(/\s$/))) { return true; }
|
|
if (args.spaceOrTagBoundary && (!last.match(/(\s|\>|\()$/))) { return true; }
|
|
}
|
|
|
|
function countLines(str) {
|
|
let index = -1, count = 0;
|
|
while ((index = str.indexOf("\n", index + 1)) !== -1) { count++; }
|
|
return count;
|
|
}
|
|
|
|
function hoister(t, target, replacement) {
|
|
const regexp = new RegExp(target.replace(/[-\/\\^$*+?.()|[\]{}]/g, '\\$&'), "g");
|
|
if (t.match(regexp)) {
|
|
const hash = guid();
|
|
t = t.replace(regexp, hash);
|
|
hoisted[hash] = replacement;
|
|
}
|
|
return t;
|
|
}
|
|
|
|
function outdent(t) {
|
|
return t.replace(/^([ ]{4}|\t)/gm, "");
|
|
}
|
|
|
|
function removeEmptyLines(t) {
|
|
return t.replace(/^\n+/, "").replace(/\s+$/, "");
|
|
}
|
|
|
|
function hideBackslashEscapedCharacters(t) {
|
|
return t.replace(/\\\\/g, "\u1E800").replace(/\\`/g, "\u1E8001");
|
|
}
|
|
|
|
function showBackslashEscapedCharacters(t) {
|
|
return t.replace(/\u1E8001/g, "\\`").replace(/\u1E800/g, "\\\\");
|
|
}
|
|
|
|
function hoistCodeBlocksAndSpans(text) {
|
|
// replace all "\`" with a single character
|
|
text = hideBackslashEscapedCharacters(text);
|
|
|
|
// /!\ the order is important /!\
|
|
|
|
// fenced code blocks (AKA GitHub code blocks)
|
|
text = text.replace(/(^\n*|\n)```([a-z0-9\-]*)\n([\s\S]*?)\n```/g, function(_, before, language, content) {
|
|
const hash = guid();
|
|
hoisted[hash] = escape(showBackslashEscapedCharacters(removeEmptyLines(content)));
|
|
return before + "```" + language + "\n" + hash + "\n```";
|
|
});
|
|
|
|
// markdown code blocks
|
|
text = text.replace(/(^\n*|\n\n)((?:(?:[ ]{4}|\t).*\n*)+)/g, function(match, before, content, index) {
|
|
// make sure we aren't in a list
|
|
var previousLine = text.slice(0, index).trim().match(/.*$/);
|
|
if (previousLine && previousLine[0].length) {
|
|
previousLine = previousLine[0].trim();
|
|
if (/^(?:\*|\+|-|\d+\.)\s+/.test(previousLine)) {
|
|
return match;
|
|
}
|
|
}
|
|
// we can safely hoist the code block
|
|
const hash = guid();
|
|
hoisted[hash] = escape(outdent(showBackslashEscapedCharacters(removeEmptyLines(content))));
|
|
return before + " " + hash + "\n";
|
|
});
|
|
|
|
// <pre>...</pre> code blocks
|
|
text = text.replace(/(\s|^)<pre>([\s\S]*?)<\/pre>/ig, function(_, before, content) {
|
|
const hash = guid();
|
|
hoisted[hash] = escape(showBackslashEscapedCharacters(removeEmptyLines(content)));
|
|
return before + "<pre>" + hash + "</pre>";
|
|
});
|
|
|
|
// code spans (double & single `)
|
|
["``", "`"].forEach(function(delimiter) {
|
|
var regexp = new RegExp("(^|[^`])" + delimiter + "([^`\\n]+?)" + delimiter + "([^`]|$)", "g");
|
|
text = text.replace(regexp, function(_, before, content, after) {
|
|
const hash = guid();
|
|
hoisted[hash] = escape(showBackslashEscapedCharacters(content.trim()));
|
|
return before + delimiter + hash + delimiter + after;
|
|
});
|
|
});
|
|
|
|
// replace back all weird character with "\`"
|
|
return showBackslashEscapedCharacters(text);
|
|
}
|