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move processing to output function #1227

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merged 5 commits into from
Apr 18, 2018
Merged

move processing to output function #1227

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090debd
move processing
UziTech Apr 17, 2018
4b7cfbe
remove unnecessary trim
UziTech Apr 17, 2018
5bc83ea
fix href `<`
UziTech Apr 17, 2018
5aed724
remove () around pedantic title
UziTech Apr 17, 2018
6869998
set title to empty string
UziTech Apr 17, 2018
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80 changes: 16 additions & 64 deletions lib/marked.js
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Expand Up @@ -554,68 +554,9 @@ inline.normal = merge({}, inline);
inline.pedantic = merge({}, inline.normal, {
strong: /^__(?=\S)([\s\S]*?\S)__(?!_)|^\*\*(?=\S)([\s\S]*?\S)\*\*(?!\*)/,
em: /^_(?=\S)([\s\S]*?\S)_(?!_)|^\*(?=\S)([\s\S]*?\S)\*(?!\*)/,
/* Original link re: /^!?\[(label)\]\(\s*<?([\s\S]*?)>?(?:\s+(['"][\s\S]*?['"]))?\s*\)/
* This captures the spec reasonably well but is vulnerable to REDOS.
* Instead we use a custom parser that follows the RegExp.exec semantics. */
link: {
exec: function (s) {
// [TEXT](DESTINATION)
var generalLinkRe = edit(/^!?\[(label)\]\((.*?)\)/)
.replace('label', inline._label)
.getRegex();

// destination: DESTINATION from generalLinkRe
// returns [destination, title]: no angle-brackets on destination, no quotes on title
function splitIntoDestinationAndTitle (destination) {
function unwrapAngleBrackets (str) {
if (str.match(/^<.*>$/)) {
str = str.slice(1, -1);
}
return str;
}

// Valid DESTINATIONs, in decreasing specificity.
var destinationAndTitleRe = /^([^'"(]*[^\s])\s+(['"(].*['")])/;
var destinationRe = /^(<?[\s\S]*>?)/;
var parsingRegexes = [destinationAndTitleRe, destinationRe];

var match = false;
for (var i = 0; i < parsingRegexes.length; i++) {
match = parsingRegexes[i].exec(destination);
if (match) {
break;
}
}

if (!match) {
return null;
}

var dest = match[1];
var title = match[2] || ''; // Not all parsingRegexes have 2 groups.

// Format dest.
dest = dest.trim();
dest = unwrapAngleBrackets(dest);

return [dest, title];
}

var fullMatch = generalLinkRe.exec(s);
if (!fullMatch) {
return null;
}

var text = fullMatch[1];
var destination = fullMatch[2];

var destinationAndTitle = splitIntoDestinationAndTitle(destination);
if (!destinationAndTitle) {
return null;
}
return [fullMatch[0], text, destinationAndTitle[0], destinationAndTitle[1]];
}
},
link: edit(/^!?\[(label)\]\((.*?)\)/)
.replace('label', inline._label)
.getRegex(),
reflink: edit(/^!?\[(label)\]\s*\[([^\]]*)\]/)
.replace('label', inline._label)
.getRegex()
Expand Down Expand Up @@ -762,8 +703,19 @@ InlineLexer.prototype.output = function(src) {
src = src.substring(cap[0].length);
this.inLink = true;
href = cap[2];
href = href[0] === '<' ? href.substring(1, href.length - 1) : href;
title = cap[3] ? cap[3].substring(1, cap[3].length - 1) : cap[3];
if (this.options.pedantic) {
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We don't test for pedantic much, and I don't see it well documented anywhere. The only docs I could find are in the man page.

Can you explain when I should test for pedantic in the future?

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If I understand this code right, without pedantic we will set href but not title. If my understanding is correct, why is this behavior desirable?

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@styfle styfle Apr 17, 2018 •
edited
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The pedantic flag means follow the original 2004 spec from John Gruber (Daring Fireball).

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  1. The regexes are grouped based on the options. The link regex that you fixed was in the pedantic group

    inline.pedantic = merge({}, inline.normal, {

  2. The title is set in the else clause. The regex for a non-pedantic link is /^!?\[(label)\]\(href(?:\s+(title))?\s*\)/ which is extremely complex when constructed and probably also error prone.

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here is the actual non-pedantic link regex:

/^!?\[((?:\[[^\[\]]*\]|\\[\[\]]?|`[^`]*`|[^\[\]\\])*?)\]\(\s*(<(?:\\[<>]?|[^\s<>\\])*>|(?:\\[()]?|\([^\s\x00-\x1f()\\]*\)|[^\s\x00-\x1f()\\])*?)(?:\s+("(?:\\"?|[^"\\])*"|'(?:\\'?|[^'\\])*'|\((?:\\\)?|[^)\\])*\)))?\s*\)/

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The link regex is checking for a title. If no title is found then the href is already set to the whole string inside the parentheses and there is no title.

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The regex that you used before when there was no title (/^(<?[\s\S]*>?)/) literally matches any string and since href is already set to the whole string there is no need to change it.

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Further down we then set the title field in the returned object based on the (undefined?) value of title. Do we want to set a default value for title, e.g. ''?

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My two cents would be an empty value of expected type. Avoid null and undefined checks and possibilities.

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I see what you are saying. Yes title should probably be defined as null or ''

looks like commonmark doesn't differentiate between the title being an empty string or no title: demo

so I will set it to an empty string.

link = /^([^'"]*[^\s])\s+(['"])(.*)\2/.exec(href);

if (link) {
href = link[1];
title = link[3];
} else {
title = '';
}
} else {
title = cap[3] ? cap[3].slice(1, -1) : '';
}
href = href.trim().replace(/^<([\s\S]*)>$/, '$1');
out += this.outputLink(cap, {
href: InlineLexer.escapes(href),
title: InlineLexer.escapes(title)
Expand Down
1 change: 1 addition & 0 deletions test/new/link_lt.html
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Original file line number Diff line number Diff line change
@@ -0,0 +1 @@
<p><a href="%3Ctest">URL</a></p>
1 change: 1 addition & 0 deletions test/new/link_lt.md
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Original file line number Diff line number Diff line change
@@ -0,0 +1 @@
[URL](<test)