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plammar

A Prolog grammar written in Prolog, for parsing and serialising Prolog code.

Installation

First, you need SWI-Prolog. See there for installation instructions.

We make use of the following packages:

• library(tap)
• library(dcg4pt)
• library(cli_table)

All can be installed by calling the following query in SWI-Prolog:

?- pack_install(tap), pack_install(dcg4pt), pack_install(cli_table).

Development Version

To get the latest development version, clone it via git and link it to the package directory of SWI-Prolog:

git clone https://github.com/fnogatz/plammar.git
ln -s $PWD/plammar $(swipl -q -g "absolute_file_name(pack(.),D,[file_type(directory)]), write(D), halt")

Pre-Compilation

It is possible to create a pre-compiled file which increases the tool's performance significantly. The command line interface is compiled using swipl's -c option:

swipl -g main -o cli.exe -c cli.pl

The .exe suffix is chosen for compatibility with Windows systems. You can also use make cli to generate the pre-compiled CLI.

Usage with SWI-Prolog

First, load the package:

?- use_module(library(plammar)).

Examples:

?- prolog_tokens(string("a(1)."), Tokens).
?- prolog_parsetree(string("a(1)."), PT).
?- prolog_ast(string("a(1)."), AST).

All three predicates can also take an additional Options list. The first argument accepts several data formats, including string(_), file(_), stream(_), chars(_) and tokens(_). The predicates can be used to parse and serialise Prolog source code.

For more examples, have a look at the /test directory.

Usage as CLI

plammar comes with a command line interface to parse given source code. You can directly execute it via

swipl -g main cli.pl -- [options] [<filename>]

Call with --help instead of the filenames to get more options. The CLI accepts a filename as the first argument. If called without this filename, the source is read from stdin.

After the pre-compilation step mentioned before, the created executable can be called via:

./cli.exe [options] [<filename>]