X-Git-Url: https://git.ayoreis.com/relax.git/blobdiff_plain/d7baaea4f90491d77b416fbf53935e090bbf7f7f..18760afc494c80d43ef455b9ef21859069936963:/relax/url-pattern-compare-component.ts?ds=inline

diff --git a/relax/url-pattern-compare-component.ts b/relax/url-pattern-compare-component.ts
index e69de29..76f8c85 100644
--- a/relax/url-pattern-compare-component.ts
+++ b/relax/url-pattern-compare-component.ts
@@ -0,0 +1,67 @@
+import type { COMPONENTS } from "./url-pattern-list.ts";
+import {
+	DEFAULT_OPTIONS,
+	HOSTNAME_OPTIONS,
+	parse_a_pattern_string,
+	Part,
+	PATHNAME_OPTIONS,
+} from "./url-pattern-pattern-string-parser.ts";
+
+const FINAL_PART = new Part("fixed-text", "", "none");
+const TYPE_SPECIFICITY = {
+	"fixed-text": 3,
+	"regexp": 2,
+	"segment-wildcard": 1,
+	"full-wildcard": 0,
+} as const;
+const MODIFIER_SPECIFICITY = {
+	"none": 3,
+	"one-or-more": 2,
+	"optional": 1,
+	"zero-or-more": 0,
+} as const;
+
+/** https://github.com/whatwg/urlpattern/issues/61#issuecomment-887000984' */
+export function compareComponent(
+	component: typeof COMPONENTS[number],
+	left: URLPattern,
+	right: URLPattern,
+) {
+	const options = component === "hostname"
+		? HOSTNAME_OPTIONS
+		: component === "pathname"
+		? PATHNAME_OPTIONS
+		: DEFAULT_OPTIONS;
+	const left_parts = parse_a_pattern_string(left[component], options, identity);
+	const right_parts = parse_a_pattern_string(
+		right[component],
+		options,
+		identity,
+	);
+	const length = Math.min(left_parts.length, right_parts.length) + 1;
+
+	for (let index = 0; index < length; index++) {
+		return compare_part(left_parts[index], right_parts[index]);
+	}
+
+	return 0;
+}
+
+function identity<Type>(value: Type): Type {
+	return value;
+}
+
+function compare_part(left: Part = FINAL_PART, right: Part = FINAL_PART) {
+	const type_specificity = TYPE_SPECIFICITY[left.type] -
+		TYPE_SPECIFICITY[right.type];
+	if (type_specificity !== 0) return type_specificity;
+
+	const modifier_specificity = MODIFIER_SPECIFICITY[left.modifier] -
+		MODIFIER_SPECIFICITY[right.modifier];
+	if (modifier_specificity !== 0) return modifier_specificity;
+
+	return (left.prefix + left.value + left.suffix).localeCompare(
+		right.prefix + right.value + right.suffix,
+		"en",
+	);
+}