ocamllex.opt - Online in the Cloud

PROGRAM:

NAME

ocamllex - The OCaml lexer generator

SYNOPSIS

ocamllex [ -o output-file ] [ -ml ] filename.mll

DESCRIPTION

The ocamllex(1) command generates OCaml lexers from a set of regular expressions with
associated semantic actions, in the style of lex(1).

Running ocamllex(1) on the input file lexer.mll produces OCaml code for a lexical analyzer
in file lexer.ml.

This file defines one lexing function per entry point in the lexer definition. These
functions have the same names as the entry points. Lexing functions take as argument a
lexer buffer, and return the semantic attribute of the corresponding entry point.

Lexer buffers are an abstract data type implemented in the standard library module Lexing.
The functions Lexing.from_channel, Lexing.from_string and Lexing.from_function create
lexer buffers that read from an input channel, a character string, or any reading
function, respectively.

When used in conjunction with a parser generated by ocamlyacc(1), the semantic actions
compute a value belonging to the type token defined by the generated parsing module.

OPTIONS

The ocamllex(1) command recognizes the following options:

-ml Output code that does not use OCaml's built-in automata interpreter. Instead, the
automaton is encoded by OCaml functions. This option is mainly useful for
debugging ocamllex(1), using it for production lexers is not recommended.

-o output-file
Specify the name of the output file produced by ocamllex(1). The default is the
input file name, with its extension replaced by .ml.

-q Quiet mode. ocamllex(1) normally outputs informational messages to standard
output. They are suppressed if option -q is used.

-v or -version
Print version string and exit.

-vnum Print short version number and exit.

-help or --help
Display a short usage summary and exit.

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