gelex - lexical analyser to generate Eiffel classes

gelex [options] files ...

This manual page documents briefly the gelex, command. This manual page was written for the Debian GNU/Linux distribution because the original program does not have a manual page. Instead, it has documentation in HTML format; see below.

gelex is a program that reads an input file containing the description of a lexical scanner and generates an Eiffel class file to implement the scanner. The description may contain option keywords, some of which can be implemented by command-line options mentioned below.

The programs follow the usual GNU command line syntax, with long options starting with two dashes (`-'). A summary of options are included below. For a complete description, see the HTML pages.

--version

Print gelex version number to the standard output and exit.

--help

Print gelex usage message to the standard output and exit.

-a size

Some Eiffel compilers experience difficulties in processing large manifest arrays. This option directs gelex to split manifest arrays with more than size elements into several smaller arrays. This option can be disabled by setting size to 0. [default: 3000]

-b

Equivalent to backup.

-c

Equivalent to nofull.

-e

Equivalent to ecs.

-f

Equivalent to full.

-h

Synonym for --help.

-i

Equivalent to case-insensitive.

-m

Equivalent to meta-ecs.

-s

Equivalent to nodefault.

-V

Synonym for --version.

-w

Equivalent to nowarn.

-x

Write each semantic action into a separate routine. The default is to write all actions into the same routine, which can become too large for C back-end compilers to handle.

-z

The generated code uses an inspect instruction to find out which ation to execute. The default is to use binary-search implemented with if instructions.

-?

Synonym for --help.

-o filename

Equivalent to outfile=" filename"

--

Mark the end of the options. Useful when the scanner description filename begins with character '-'.

filename

Name of gelex input file containing the scanner description. By convention gelex input filenames have the extension '.l', as in my_scanner.l. One is not required to follow this convention though.

GOBO and its programs are documented fully by HTML pages in gobo-doc package.

This manual page was written by Oliver Elphick <Oliver.Elphick@lfix.co.uk>, and updated by Julien LEMOINE <speedblue@debian.org> for the Debian GNU/Linux system (but may be used by others).