OCaml library : Stdlib.Genlex

# Module Stdlib.Genlex

    module Genlex: Genlex

    type token =

`|` | `Kwd of `string``
`|` | `Ident of `string``
`|` | `Int of `int``
`|` | `Float of `float``
`|` | `String of `string``
`|` | `Char of `char``

The type of tokens. The lexical classes are: `Int` and `Float` for integer and floating-point numbers; `String` for string literals, enclosed in double quotes; `Char` for character literals, enclosed in single quotes; `Ident` for identifiers (either sequences of letters, digits, underscores and quotes, or sequences of 'operator characters' such as `+`, `*`, etc); and `Kwd` for keywords (either identifiers or single 'special characters' such as `(`, `}`, etc).

    val make_lexer : string list -> char Stream.t -> token Stream.t

Construct the lexer function. The first argument is the list of keywords. An identifier `s` is returned as `Kwd s` if `s` belongs to this list, and as `Ident s` otherwise. A special character `s` is returned as `Kwd s` if `s` belongs to this list, and cause a lexical error (exception `Stream.Error` with the offending lexeme as its parameter) otherwise. Blanks and newlines are skipped. Comments delimited by `(*` and `*)` are skipped as well, and can be nested. A `Stream.Failure` exception is raised if end of stream is unexpectedly reached.