https://github.com/rla/prolog-yamltiny

A YAML subset parser for Prolog
https://github.com/rla/prolog-yamltiny

swi-prolog yaml yaml-parser

Last synced: 11 months ago
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A YAML subset parser for Prolog

• Host: GitHub
• URL: https://github.com/rla/prolog-yamltiny
• Owner: rla
• License: mit
• Created: 2013-01-27T15:23:46.000Z (over 13 years ago)
• Default Branch: master
• Last Pushed: 2013-01-27T15:31:30.000Z (over 13 years ago)
• Last Synced: 2025-04-08T20:11:14.077Z (about 1 year ago)
• Topics: swi-prolog, yaml, yaml-parser
• Language: Prolog
• Size: 105 KB
• Stars: 6
• Watchers: 2
• Forks: 1
• Open Issues: 2
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

          
Prolog-yamltiny

===============

A YAML subset parser for Prolog. The subset of YAML was partially

taken from http://search.cpan.org/~adamk/YAML-Tiny-1.51/lib/YAML/Tiny.pm#YAML_TINY_SPECIFICATION

This implementation, however, supports no directives. Single/double block

literals are not supported. At the moment, writing YAML documents is

not supported. No types are supported, all primitive values are atoms.

Dependencies

------------

The code has been tested on Swi-Prolog. It uses DCG's to implement

the lexer and the parser. For IO it depends on `library(readutil)`,

for various other predicates it depends on `library(apply)`.

Unit tests

----------

Unit tests cover most features. The tests are in the file `src/tests.pl`

and can be ran with the command `make test` or by loading the file

manually into Swi-Prolog and calling `run_tests`.

Example usage

-------------

Predicates:

* `yamltiny_parse(+Codes:list, -Documents:list) is det`.

* `yamltiny_read(+Filename:atom, -Documents:list) is det`.

Complete Prolog program:

    :- use_module(library(yamltiny)).

    

    main:-

        yamltiny_read('file.yml', Documents),

        writeln(Documents).

Input file:

    - a

    - b

    - c

Prolog term (contains one documents):

    [ array([a, b, c]) ]

    

Input file:

    a: hello

    b: world

    

Prolog term:

    

    [ hash(a-hello, b-world) ]

Installation

------------

Assuming you have Swi-Prolog installed, run `make install`. You should

first make sure that unit tests run without errors. 

License

-------

The MIT license. See LICENSE file.