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# The asciimath2jax Preprocessor

The options below control the operation of the asciimath2jax preprocessor that is run when you include `"asciimath2jax.js"` in the extensions array of your configuration. They are listed with their default values. To set any of these options, include a `asciimath2jax` section in your `MathJax.Hub.Config()` call. For example

    MathJax.Hub.Config({
      asciimath2jax: {
        delimiters: [['`','`'], ['$','$']]
      }
    });

would set the ASCIIMath delimiters for the asciimath2jax preprocessor to include dollar signs as well as back-ticks.

`delimiters: [['`','`']]`

  Array of pairs of strings that are to be used as math delimiters. The first in each pair is the initial delimiter and the second is the terminal delimiter. You can have as many pairs as you want. For example,

      inlineMath: [ ['$','$'], ['`','`'] ]

  would cause asciimath2jax to look for `$...$` and ``...`` as delimiters for inline mathematics. (Note that the single dollar signs are not enabled by default because they are used too frequently in normal text, so if you want to use them for math delimiters, you must specify them explicitly.)

  Note that the delimiters can’t look like HTML tags (i.e., can’t include the less-than sign), as these would be turned into tags by the browser before MathJax has the chance to run. You can only include text, not tags, as your math delimiters.

`preview: "AsciiMath"`

  This controls whether asciimath2jax inserts `MathJax_Preview` spans to make a preview available, and what preview to use, when it locates in-line or display mathematics in the page. The default is `"AsciiMath"`, which means use the ASCIIMath code as the preview (which will be visible until it is processed by MathJax). Set to `"none"` to prevent previews from being inserted (the math will simply disappear until it is typeset). Set to an array containing the description of an HTML snippet in order to use the same preview for all equations on the page.

  Examples:

      preview: ["[math]"],     //  insert the text "[math]" as the preview

      preview: [["img",{src: "/images/mypic.jpg"}]],  // insert an image as the preview

  See the description of HTML snippets for details on how to represent HTML code in this way.

`skipTags: ["script","noscript","style","textarea","pre","code"]`

  This array lists the names of the tags whose contents should not be processed by asciimath2jax (other than to look for ignore/process classes as listed below). You can add to (or remove from) this list to prevent MathJax from processing mathematics in specific contexts.

`ignoreClass: "asciimath2jax_ignore"`

  This is the class name used to mark elements whose contents should not be processed by asciimath2jax (other than to look for the `processClass` pattern below). Note that this is a regular expression, and so you need to be sure to quote any regexp special characters. The pattern is inserted into one that requires your pattern to match a complete word, so setting `ignoreClass: "class2"` would cause it to match an element with `class="class1 class2 class3"` but not `class="myclass2"`. Note that you can assign several classes by separating them by the vertical line character (`|`). For instance, with `ignoreClass: "class1|class2"` any element assigned a class of either `class1` or `class2` will be skipped.

`processClass: "asciimath2jax_process"`

  This is the class name used to mark elements whose contents should be processed by asciimath2jax. This is used to restart processing within tags that have been marked as ignored via the `ignoreClass` or to cause a tag that appears in the `skipTags` list to be processed rather than skipped. Note that this is a regular expression, and so you need to be sure to quote any regexp special characters. The pattern is inserted into one that requires your pattern to match a complete word, so setting `processClass: "class2"` would cause it to match an element with `class="class1 class2 class3"` but not `class="myclass2"`. Note that you can assign several classes by separating them by the vertical line character (`|`). For instance, with `processClass: "class1|class2"` any element assigned a class of either `class1` or `class2` will have its contents processed.

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