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Prolog URI parser

Group members:

  • Alessandro Pucci 869177
  • Matias Aldo Ruiz 869139

The purpose of this project is to create a Prolog library that can build structures, internally representing URIs (Uniform Resource Identifiers), starting from their representations as strings. Parsing requires analyzing and decomposing the input string in sequence, character from character from left to right, in order to build a proper structure that stores its seven components.

We adopted DCGs (Definite Clause Grammars) in our Prolog program to carry out the project.

An URI is made of "Scheme", "Userinfo, "Host", "Port", "Path", "Query" and "Fragment".

An uri-structure is like this: uri(Scheme, Userinfo, Host, Port, Path, Query, Fragment).

If not specified, in every scheme, 80 is the default port. An empty field, if the URI is still valid, is set to [] (empty list).

If uri_parse is called with an invalid URIString, it returns the following error: "URI is not valid!".

Call uri_parse(URIString, URI). in order to get URI structure.

Call uri_display(URI). in order to print on screen (std output) URI fields.

Note that uri_display(URI) automatically closes the stream!

Call uri_display(URI, Stream). in order to print on the provided Stream URI fields.

Note that uri_display(URI, Stream) automatically closes the stream!

Thanks for reading!