The command line syntax for Alex is entirely standard:
$ alex { option } file.x { option }Alex expects a single file.x to be named on the command line. By default, Alex will create file.hs containing the Haskell source for the lexer.
The options that Alex accepts are listed below:
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.
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 informative.
Look in dir for template files.
Causes Alex to produce 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.
Causes Alex to produce a lexer which will output debugging messsages as it runs.
Display help and exit.
Output version information and exit. Note that for legacy reasons -v is supported, too, but the use of it is deprecated. -v will be used for verbose mode when it is actually implemented.