Stdlib.Genlex(3) OCaml library Stdlib.Genlex(3)

# [NAME](#NAME)

Stdlib.Genlex - no description

# [Module](#Module)

Module Stdlib.Genlex

# [Documentation](#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.

2026-10-27 OCamldoc

---

Document: Stdlib.Genlex(3o) from ocaml-4 4.14.4-r4 (Chainguard OS)
Source: https://github.com/ocaml/ocaml