Mathics-Scanner 2.0.0

Character Tables and Tokenizer for Mathics and the Wolfram Language.

Mathics Character Tables and Scanner

This repository really contains two things:

• extensive tables describing WL symbols, operators, and their properties

• a tokenizer or scanner portion for the Wolfram Language.

Concerning the first item, there are two commented YAML files that contain a full set of translations between:

• Wolfram Language named characters,

• Unicode/ASCII equivalents and Unicode and WL code-points,

• AMSLaTeX equivalent names,

• Operator name (if symbol is an operator),

• Operator arity (if an operator)

• Operator precedence (if an operator)

• Operator associativity (if an operator)

• Keyboard escape sequences for the symbol

Uses

The scanner and character tables are used inside Mathics3. However information can also be used by other programs for tokenizing and formatting Wolfram Language code.

For example, tables are used in mathics-pygments, a Pygments-based lexer and highlighter for Mathematica/Wolfram Language source code.

This library may be useful if you need to work with the Wolfram Language named character and convert it to various formats.

Usage

• For tokenizing and scanning Wolfram Language code, use the mathics_scanner.tokenizer.Tokenizer class.

• To convert between Wolfram Language named characters and Unicode/ASCII, use the mathics_scanner.characters.replace_wl_with_plain_text and mathics_scanner.characters.replace_unicode_with_wl functions.

• To convert between qualified names of named characters (such FormalA for \[FormalA]) and Wolfram’s internal representation use the m̀athics_scanner.characters.named_characters dictionary.

To regenerate JSON-format tables, run:

$ mathics3-generate-json-table
$ mathics3-generate-operator-json-table

Without options, mathics3-generate-json-table produces the maximum set of correspondences.

In most applications, though, you may need just a few of these. The --field option can be used to narrow the list of entries to output in JSON. Run mathics3-generate-json-table --help for a full list of fields.

Utility for showing token parsing

There is a command-line utility, mathics3-tokens, for showing how an input stream is tokenized. The --CodeTokenize or -C option will try to show the token as it would appear using CodeTokenize. type mathics3-tokens --help information on command-line options.

Implementation

For notes on the implementation of the packages or details on the conversion scheme please read Implementation.

Contributing

Please feel encouraged to contribute to this package or Mathics3! Create your own fork, make the desired changes, commit, and make a pull request.

License

Mathics3 is released under the GNU General Public License Version 3 (GPL3).