https://github.com/lwakefield/lexer.cr

A super simple regex based lexer written in Crystal.
https://github.com/lwakefield/lexer.cr

crystal crystal-lang crystal-language lexer

Last synced: 12 months ago
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A super simple regex based lexer written in Crystal.

• Host: GitHub
• URL: https://github.com/lwakefield/lexer.cr
• Owner: lwakefield
• Created: 2020-07-05T15:53:13.000Z (over 5 years ago)
• Default Branch: master
• Last Pushed: 2020-07-05T15:59:00.000Z (over 5 years ago)
• Last Synced: 2025-02-05T21:27:27.372Z (about 1 year ago)
• Topics: crystal, crystal-lang, crystal-language, lexer
• Language: Crystal
• Homepage:
• Size: 1000 Bytes
• Stars: 4
• Watchers: 3
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: readme.md

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README

          
lexer.cr

========

A super simple regex based lexer written in Crystal.

```crystal

# precedence defined by order in which keys are defined ie. def has a higher

# precedence than identifier.

token_map = {

  "def"        => /def/,

  "end"        => /end/,

  "identifier" => /\w+/,

  "number"     => /\d+/,

  "lparen"     => /\(/,

  "rparen"     => /\)/,

  "plus"       => /\+/,

  "whitespace" => /\s+/,

}

Lexer.lex(token_map, "def inc (a) a + 1 end")

```

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Lex away!