Stdlib.Genlex(3)

NAME
Stdlib.Genlex - no description

Module
Module Stdlib.Genlex

Documentation

Module Genlex
 : (module Stdlib__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.