object

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: 1:1:0
Date: 2026-04-01
Compilation flags:
static, context_switching_calls
Uses:
list
Remarks:
(none)
Inherited public predicates:
(none)

Public predicates

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

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

generate/2

Generates a normalized 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

normalize/2

Normalizes a URL by standardizing its components. Normalization includes converting the scheme to lowercase, percent-encoding characters that require escaping, ensuring proper path separators, and handling relative paths.

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

file_path_components/2

Converts a file-system path into file URL components represented as [authority(Authority), path(Path)]. Windows drive-letter and UNC paths are normalized to RFC3986-compatible file URL components.

Compilation flags:
static
Template:
file_path_components(FilePath,Components)
Mode and number of proofs:
file_path_components(++text,-list(compound)) - one

Protected predicates

(no local declarations; see entity ancestors if any)

Private predicates

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)