In Pygments, a custom lexer for Magma can be defined as a subclass of `RegexLexer` named `Magma`. The class sets core metadata attributes, including `name = 'Magma'`, `aliases = ['magma']`, and filename matching patterns `filenames = ['*.m', '*.mag']`.

Magma RegexLexer Class Definition

The Magma lexer compiles its reserved keywords by concatenating multiple whitespace-delimited keyword strings derived from Emacs Magma-mode categories: `keywords`, `operators`, `extra_keywords`, `constructors`, `block_open`, and `block_close`. These strings are combined (`keywords += operators + extra_keywords + constructors + block_open + block_close`) and converted into a list using `keywords.split()`.

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