https://github.com/mndrix/function_expansion

Help for writing function-like macros
https://github.com/mndrix/function_expansion

Last synced: 7 months ago
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Help for writing function-like macros

• Host: GitHub
• URL: https://github.com/mndrix/function_expansion
• Owner: mndrix
• License: unlicense
• Archived: true
• Created: 2013-01-18T22:49:52.000Z (over 13 years ago)
• Default Branch: master
• Last Pushed: 2016-10-27T19:06:47.000Z (over 9 years ago)
• Last Synced: 2024-05-01T22:45:07.635Z (about 2 years ago)
• Language: Prolog
• Size: 148 KB
• Stars: 4
• Watchers: 3
• Forks: 3
• Open Issues: 1
• Metadata Files:
  • Readme: README
  • License: LICENSE

Awesome Lists containing this project

• awesome-prolog - function_expansion - Function-like macros. (Development)

README

          
# Synopsis

    :- use_module(library(function_expansion)).

    user:function_expansion(incr(N), X, X is N+1).

    main :-

        format('After 2 comes ~p~n', [incr(2)]).

# Description

Prolog doesn't offer function syntax.  Anything one can do with

functions, she can do with predicates. The syntax is a little

verbose because it requires an auxiliary variable.

For example, one might approximate pi:

    pi(3.14159).

    main :-

        pi(Pi),

        format('pi is roughly ~p~n', [Pi]).

It's often obnoxious to think up a name for an auxiliary variable.

function_expansion/3 lets you write macros so that `pi` can be included

directly in format's arguments.  Auxiliary variables are generated for

you at compile time.

Repository available on GitHub: https://github.com/mndrix/function_expansion

# Installation

Using SWI-Prolog 6.3 or later:

    $ swipl

    1 ?- pack_install(function_expansion).