`url(Representation)`

Representation - URL and is components representation. Valid values are atom, codes, and chars. URL validating, parsing, and normalizing predicates following RFC3986 nomenclature.
| Availability: | logtalk_load(url(loader))

| Author: Paulo Moura | Version: 1:0:0 | Date: 2026-01-22

| Compilation flags: | static, context_switching_calls

| Uses: | :ref:`list <list/0>`

| Remarks: | (none)

| Inherited public predicates: | (none)

.. contents:: :local: :backlinks: top

Public predicates

.. index:: valid/1 .. _url/1::valid/1:

valid/1 ^^^^^^^^^^^

True iff the argument is a valid URL, including optional query and fragment components.

| Compilation flags: | static

| Template: | valid(URL) | Mode and number of proofs: | valid(++text) - zero_or_one

.. index:: parse/2 .. _url/1::parse/2:

parse/2 ^^^^^^^^^^^

Parses a URL into a list of its components: [scheme(Scheme), authority(Authority), path(Path), query(Query), fragment(Fragment)]. Fails if the URL is invalid and cannot be parsed.

| Compilation flags: | static

| Template: | parse(URL,Components) | Mode and number of proofs: | parse(++text,-list(compound)) - zero_or_one

.. index:: generate/2 .. _url/1::generate/2:

generate/2 ^^^^^^^^^^^^^^

Generates a URL from a list of its components: [scheme(Scheme), authority(Authority), path(Path), query(Query), fragment(Fragment)] for standard URLs, or scheme-specific components for mailto, news, tel, and urn URLs. Fails if the components are invalid.

| Compilation flags: | static

| Template: | generate(Components,URL) | Mode and number of proofs: | generate(++list(compound),-text) - zero_or_one

.. index:: normalize/2 .. _url/1::normalize/2:

normalize/2 ^^^^^^^^^^^^^^^

Normalizes a URL by standardizing its components. Normalization includes converting scheme and authority to lowercase, ensuring proper path separators, and handling relative paths.

| Compilation flags: | static

| Template: | normalize(URL,NormalizedURL) | Mode and number of proofs: | normalize(++text,-text) - one

Protected predicates

(no local declarations; see entity ancestors if any)

Private predicates

.. index:: downcase_text/2 .. _url/1::downcase_text/2:

downcase_text/2 ^^^^^^^^^^^^^^^^^^^

Converts text to lowercase (ASCII only). Only uppercase letters A-Z are converted to lowercase.

| Compilation flags: | static

| Template: | downcase_text(Text,LowerText) | Mode and number of proofs: | downcase_text(+text,-text) - one

Operators

(none)