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GFM strikethrough compatibility #1258

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merged 2 commits into from
Jul 9, 2018
Merged

GFM strikethrough compatibility #1258

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1420eb3
Strikethrough support for GFM
May 5, 2018
22b17fe
Merge branch 'master' of https://github.com/markedjs/marked into gfm-…
May 9, 2018
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2 changes: 1 addition & 1 deletion lib/marked.js
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Expand Up @@ -588,7 +588,7 @@ inline.gfm = merge({}, inline.normal, {
.replace('email', inline._email)
.getRegex(),
_backpedal: /(?:[^?!.,:;*_~()&]+|\([^)]*\)|&(?![a-zA-Z0-9]+;$)|[?!.,:;*_~)]+(?!$))+/,
del: /^~~(?=\S)([\s\S]*?\S)~~/,
del: /^~+(?=\S)([\s\S]*?\S)~+/,
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  1. Could this be simplified (no look-ahead) to /^~+([^\s~][\s\S]*?\S)~+/?
  2. Why not ~~ leading/trailing spaces ~~? Seems like the spec permits this.

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  1. The spec might allow it but github doesn't

without space:
asdf

with space:
~ asdf ~

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@davisjam davisjam May 9, 2018 •
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Interesting. Would this work? /^~+([^~]+)~+/.

(This regex will accept the "with space" version which I think is appropriate despite GitHub's treatment of it).

The spec says "No nesting" which I think means that the first ~ should terminate the strike-through.

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I think we should act like GitHub when the spec is ambiguous

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To answer my own question, /^~+([^\s~][\s\S]*?\S)~+/ won't work -- it requires a minimum of two characters between the ~s.

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@davisjam davisjam May 9, 2018 •
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I'm a little concerned that this regex (old and new versions) will match ~~~. How about

/^~+(?=[^\s~])([^~]*[^\s~])~+/

which will:

  1. Ensure that the "text" neither begins nor ends with whitespace or a ~; and
  2. Explicitly prevent nesting without needing to rely on the non-greedy *? behavior.

Thoughts?

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Is there any particular reason to avoid the non-greedy modifier?

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I'm nervous about the structure /~+...[\s\S]*?...~+/. I do not believe that as written the regex is vulnerable, but a slight modification would make it so. If the middle group excludes a ~ character then the risk is removed.

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@davisjam If this is not vulnerable as written then I think we should merge it because it brings us into compliance. Adding @joshbruce to take a look.

text: edit(inline.text)
.replace(']|', '~]|')
.replace('|', '|https?://|ftp://|www\\.|[a-zA-Z0-9.!#$%&\'*+/=?^_`{\\|}~-]+@|')
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2 changes: 1 addition & 1 deletion test/specs/gfm/gfm-spec.js
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Expand Up @@ -56,7 +56,7 @@ describe('GFM 0.28 Task list items', function() {
describe('GFM 0.28 Strikethrough', function() {
var section = 'Strikethrough';

var shouldPassButFails = [469, 470];
var shouldPassButFails = [];

var willNotBeAttemptedByCoreTeam = [];

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