Support math latex.

[ahuigo]

Marked version:
Release 0.4.0

Contributor

I don't know how to test this project exactly. Any advice?

• Test(s) exist to ensure functionality and minimize regression (if no tests added, list tests covering this PR); or,
• no tests required for this PR.
• If submitting new feature, it has been documented in the appropriate places.

The demo for this feature:

https://github.com/ahuigo/marked/blob/master/docs/demo/latex.html

Committer

In most cases, this should be a different person than the contributor.

• Draft GitHub release notes have been updated.
• CI is green (no forced merge required).
• Merge PR

[UziTech]

This seems like it would be better as a wrapper around marked.

You could create a separate npm package that extends the lexer

[ahuigo]

@UziTech
It's hard to add a wrapper for marked. I have to add a math lexer to marked.( If user want to parse math, he should pass option latexParser).

1. I wish marked itself would support math lexer, because many people need math latex.
2. If I create a separate npm, it was hard to pull code back to upstream , as I have changed marked's lexer directly.

[UziTech]

We are trying to slim marked down. By the 1.0 release we would like to deprecate most of the options.

We are trying to focus on making marked spec compliant with CommonMark and GFM. For everything else we would like to create separate modules that extend marked.

I can leave this PR open so we can revisit it in the future and possibly create a module ourselves but it will be a while before that happens.

[BenjaminHoegh]

Is there a API for marked or is it code it from the ground if you wanna make extensions to it?

[UziTech]

You can check out the documentation here for extending marked.

[BenjaminHoegh]

@UziTech Posible without node.js? Some web hotels don't support nodejs and would like to keep it working on so many server types as possible

[UziTech]

@BenjaminHoegh Is what possible without node? marked is written in js so it needs a js engine in order to run at all.

If you use marked on the client side it will create a global variable marked so you just replace var myMarked = require('marked'); with var myMarked = marked;

[BenjaminHoegh]

@UziTech Is there documentation about how to add new rules to inline and block

[UziTech]

I don't believe there is a way to add new rules easily yet. All of our documentation is at marked.js.org

[yhcharles]

@ahuigo
It seems the blocklatex is not rendering in display mode, which gives this:

but it's better to be this:

[ahuigo]

@yhcharles What you need is \displaystyle , for example$\displaystyle \sum_i^j$. You can try it here: https://ahuigo.github.io/a/md.html

[BrianHung]

@yhcharles

This is a bit late, but another solution would be to change the source code beginning at line 935 from

      var html = marked.defaults.latexRender(text);
      if (block) {
        out = '<div style="text-align:center">' + html + '</div>';
      }else{
        out = html;
      }

to

      if (block) {
        out = marked.defaults.latexRender(text, {displayMode: true});
      }else{
        out = marked.defaults.latexRender(text);
      }

This assumes you're using KaTeX to render LaTeX; documentation here. I'm sure that MathJax has the same setting.

Note I haven't tested this implementation yet.