This is the command alex that can be run in the OnWorks free hosting provider using one of our multiple free online workstations such as Ubuntu Online, Fedora Online, Windows online emulator or MAC OS online emulator
alex - the lexical analyser generator for Haskell
alex [OPTION]... file [OPTION]...
This manual page documents briefly the alex 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 various other
formats, including DVI, Info and HTML; see below.
Alex is a lexical analyser generator system for Haskell. It is similar to the tool lex or
flex for C/C++.
Input files are expected to be of the form file.x and alex will produce output in file.y
Caveat: When using hbc (Chalmers Haskell) the command argument structure is slightly
different. This is because the hbc run time system takes some flags as its own (for
setting things like the heap size, etc). This problem can be circumvented by adding a
single dash (`-') to your command line. So when using a hbc generated version of Alex,
the argument structure is:
alex - [OPTION]... file [OPTION]...
The programs follow the usual GNU command line syntax, with long options starting with two
dashes (`--'). A summary of options is included below. For a complete description, see
the other documentation.
Instructs Alex to generate a lexer which will output debugging messages as it runs.
Instructs Alex to generate a lexer which is optimised for compiling with GHC. The
lexer will be significantly more efficient, both in terms of the size of the
compiled lexer and its runtime.
-o FILE, --outfile=FILE
Specifies the filename in which the output is to be placed. By default, this is the
name of the input file with the .x suffix replaced by .hs
-i [FILE], --info[=FILE]
Produces a human-readable rendition of the state machine (DFA) that Alex derives
from the lexer, in FILE (default: file.info where the input file is file.x ).
The format of the info file is currently a bit basic, and not particularly
Print version information on standard output then exit successfully.
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