| Safe Haskell | Safe-Inferred |
|---|---|
| Language | Haskell2010 |
Language.Lexer.Applicative
Description
For an example, see https://ro-che.info/articles/2015-01-02-lexical-analysis
Documentation
Arguments
| :: RE Char token | regular expression for tokens |
| -> RE Char () | regular expression for whitespace and comments |
| -> String | source file name (used in locations) |
| -> String | source text |
| -> [L token] |
The lexer.
In case of a lexical error, throws the LexicalError exception.
This may seem impure compared to using Either, but it allows to
consume the token list lazily.
Both token and whitespace regexes consume as many characters as possible (the maximal munch rule). When a regex returns without consuming any characters, a lexical error is signaled.