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/**
* Hydrilla/Lernette operations on page url patterns
*
* Copyright (C) 2021 Wojtek Kosior
* Redistribution terms are gathered in the `copyright' file.
*/
const proto_re = "[a-zA-Z]*:\/\/";
const domain_re = "[^/?#]+";
const segments_re = "/[^?#]*";
const query_re = "\\?[^#]*";
const url_regex = new RegExp(`\
^\
(${proto_re})\
(${domain_re})\
(${segments_re})?\
(${query_re})?\
#?.*\$\
`);
function deconstruct_url(url)
{
const regex_match = url_regex.exec(url);
if (regex_match === null)
return undefined;
let [_, proto, domain, path, query] = regex_match;
domain = domain.split(".");
let path_trailing_dash =
path && path[path.length - 1] === "/";
path = (path || "").split("/").filter(s => s !== "");
path.unshift("");
return {proto, domain, path, query, path_trailing_dash};
}
/* Be sane: both arguments should be arrays of length >= 2 */
function domain_matches(url_domain, pattern_domain)
{
const length_difference = url_domain.length - pattern_domain.length;
for (let i = 1; i <= url_domain.length; i++) {
const url_part = url_domain[url_domain.length - i];
const pattern_part = pattern_domain[pattern_domain.length - i];
if (pattern_domain.length === i) {
if (pattern_part === "*")
return length_difference === 0;
if (pattern_part === "**")
return length_difference > 0;
if (pattern_part === "***")
return true;
return length_difference === 0 && pattern_part === url_part;
}
if (pattern_part !== url_part)
return false;
}
return pattern_domain.length === url_domain.length + 1 &&
pattern_domain[0] === "***";
}
function path_matches(url_path, url_trailing_dash,
pattern_path, pattern_trailing_dash)
{
const dashes_ok = !(pattern_trailing_dash && !url_trailing_dash);
if (pattern_path.length === 0)
return url_path.length === 0 && dashes_ok;
const length_difference = url_path.length - pattern_path.length;
for (let i = 0; i < url_path.length; i++) {
if (pattern_path.length === i + 1) {
if (pattern_path[i] === "*")
return length_difference === 0;
if (pattern_path[i] === "**") {
return length_difference > 0 ||
(url_path[i] === "**" && dashes_ok);
}
if (pattern_path[i] === "***")
return length_difference >= 0;
return length_difference === 0 &&
pattern_path[i] === url_path[i] && dashes_ok;
}
if (pattern_path[i] !== url_path[i])
return false;
}
return false;
}
function url_matches(url, pattern)
{
const url_deco = deconstruct_url(url);
const pattern_deco = deconstruct_url(pattern);
if (url_deco === undefined || pattern_deco === undefined) {
console.log(`bad comparison: ${url} and ${pattern}`);
return false
}
if (pattern_deco.proto !== url_deco.proto)
return false;
return domain_matches(url_deco.domain, pattern_deco.domain) &&
path_matches(url_deco.path, url_deco.path_trailing_dash,
pattern_deco.path, pattern_deco.path_trailing_dash);
}
/*
* Call callback for every possible pattern that matches url. Return when there
* are no more patterns or callback returns false.
*/
function for_each_possible_pattern(url, callback)
{
const deco = deconstruct_url(url);
if (deco === undefined) {
console.log("bad url format", url);
return;
}
for (let d_slice = 0; d_slice < deco.domain.length; d_slice++) {
const domain_part = deco.domain.slice(d_slice).join(".");
const domain_wildcards = [];
if (d_slice === 0)
domain_wildcards.push("");
if (d_slice === 1)
domain_wildcards.push("*.");
if (d_slice > 0)
domain_wildcards.push("**.");
domain_wildcards.push("***.");
for (const domain_wildcard of domain_wildcards) {
const domain_pattern = domain_wildcard + domain_part;
for (let s_slice = deco.path.length; s_slice > 0; s_slice--) {
const path_part = deco.path.slice(0, s_slice).join("/");
const path_wildcards = [];
if (s_slice === deco.path.length) {
if (deco.path_trailing_dash)
path_wildcards.push("/");
path_wildcards.push("");
}
if (s_slice === deco.path.length - 1 &&
deco.path[s_slice] !== "*")
path_wildcards.push("/*");
if (s_slice < deco.path.length &&
(deco.path[s_slice] !== "**" ||
s_slice < deco.path.length - 1))
path_wildcards.push("/**");
if (deco.path[s_slice] !== "***" || s_slice < deco.path.length)
path_wildcards.push("/***");
for (const path_wildcard of path_wildcards) {
const path_pattern = path_part + path_wildcard;
const pattern = deco.proto + domain_pattern + path_pattern;
if (callback(pattern) === false)
return;
}
}
}
}
}
function possible_patterns(url)
{
const patterns = [];
for_each_possible_pattern(url, patterns.push);
return patterns;
}
/*
* EXPORTS_START
* EXPORT url_matches
* EXPORT for_each_possible_pattern
* EXPORT possible_patterns
* EXPORTS_END
*/
|
