Add utils for ranking and finding labels

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+### Added
+-   Add utils for ranking and finding labels
+
+### Deprecated
+
+### Removed
+
+### Security

arches_vue_utils/src/arches_vue_utils/constants.ts

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+export const PREF_LABEL = "prefLabel";
+export const ALT_LABEL = "altLabel";
+export const HIDDEN_LABEL = "hiddenLabel";

arches_vue_utils/src/arches_vue_utils/types.ts

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+export interface Language {
+    code: string;
+    default_direction: "ltr" | "rtl";
+    id: number;
+    isdefault: boolean;
+    name: string;
+    scope: string;
+}
+
+export interface Label {
+    value: string;
+    languageCode: string;
+    valuetype: "prefLabel" | "altLabel" | "hiddenLabel";
+}
+
+export interface Labellable {
+    labels: Label[];
+}

arches_vue_utils/src/arches_vue_utils/utils.spec.ts

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+import {
+    ALT_LABEL,
+    HIDDEN_LABEL,
+    PREF_LABEL,
+} from "@/arches_vue_utils/constants.ts";
+import { getItemLabel, rankLabel } from "@/arches_vue_utils/utils.ts";
+
+import type { Label } from "@/arches_vue_utils/types";
+
+// Test utils
+const asLabel = (
+    valuetype: "prefLabel" | "altLabel" | "hiddenLabel",
+    languageCode: string,
+): Label => {
+    return {
+        value: "arbitrary",
+        valuetype,
+        languageCode,
+    };
+};
+
+const systemLanguageCode = "en-ZA"; // arbitrary
+
+describe("rankLabel() util", () => {
+    const rank = (
+        valuetype: "prefLabel" | "altLabel" | "hiddenLabel",
+        labelLanguageCode: string,
+        desiredLanguageCode: string,
+    ) =>
+        rankLabel(
+            asLabel(valuetype, labelLanguageCode),
+            desiredLanguageCode,
+            systemLanguageCode,
+        );
+
+    // Test cases inspired from python module
+    it("Prefers explicit region", () => {
+        expect(rank(PREF_LABEL, "fr-CA", "fr-CA")).toBeGreaterThan(
+            rank(PREF_LABEL, "fr", "fr-CA"),
+        );
+    });
+    it("Prefers pref over alt", () => {
+        expect(rank(PREF_LABEL, "fr", "fr-CA")).toBeGreaterThan(
+            rank(ALT_LABEL, "fr", "fr-CA"),
+        );
+    });
+    it("Prefers alt over hidden", () => {
+        expect(rank(ALT_LABEL, "fr", "fr-CA")).toBeGreaterThan(
+            rank(HIDDEN_LABEL, "fr", "fr-CA"),
+        );
+    });
+    it("Prefers alt label in system language to anything else", () => {
+        expect(rank(ALT_LABEL, systemLanguageCode, "en")).toBeGreaterThan(
+            rank(PREF_LABEL, "de", "en"),
+        );
+    });
+    it("Prefers region-insensitive match in system language", () => {
+        expect(rank(PREF_LABEL, "en", "de")).toBeGreaterThan(
+            rank(PREF_LABEL, "fr", "de"),
+        );
+    });
+});
+
+describe("getItemLabel() util", () => {
+    it("Errors if no labels", () => {
+        expect(() =>
+            getItemLabel(
+                { labels: [] },
+                systemLanguageCode,
+                systemLanguageCode,
+            ),
+        ).toThrow();
+    });
+    it("Falls back to system language", () => {
+        expect(
+            getItemLabel(
+                {
+                    labels: [
+                        asLabel(PREF_LABEL, "de"),
+                        asLabel(PREF_LABEL, systemLanguageCode),
+                    ],
+                },
+                "fr",
+                systemLanguageCode,
+            ).languageCode,
+        ).toEqual(systemLanguageCode);
+    });
+});

arches_vue_utils/src/arches_vue_utils/utils.ts

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+import { ALT_LABEL, PREF_LABEL } from "@/arches_vue_utils/constants.ts";
+
+import type { Label, Labellable } from "@/arches_vue_utils/types";
+
+/* Port of rank_label in arches.app.utils.i18n python module */
+export const rankLabel = (
+    label: Label,
+    preferredLanguageCode: string,
+    systemLanguageCode: string,
+): number => {
+    let rank = 1;
+    if (label.valuetype === PREF_LABEL) {
+        rank = 10;
+    } else if (label.valuetype === ALT_LABEL) {
+        rank = 4;
+    }
+
+    // Some arches deployments may not have standardized capitalizations.
+    const labelLanguageFull = label.languageCode.toLowerCase();
+    const labelLanguageNoRegion = label.languageCode
+        .split(/[-_]/)[0]
+        .toLowerCase();
+    const preferredLanguageFull = preferredLanguageCode.toLowerCase();
+    const preferredLanguageNoRegion = preferredLanguageCode
+        .split(/[-_]/)[0]
+        .toLowerCase();
+    const systemLanguageFull = systemLanguageCode.toLowerCase();
+    const systemLanguageNoRegion = systemLanguageCode
+        .split(/[-_]/)[0]
+        .toLowerCase();
+
+    if (labelLanguageFull === preferredLanguageFull) {
+        rank *= 10;
+    } else if (labelLanguageNoRegion === preferredLanguageNoRegion) {
+        rank *= 5;
+    } else if (labelLanguageFull === systemLanguageFull) {
+        rank *= 3;
+    } else if (labelLanguageNoRegion === systemLanguageNoRegion) {
+        rank *= 2;
+    }
+
+    return rank;
+};
+
+export const getItemLabel = (
+    item: Labellable,
+    preferredLanguageCode: string,
+    systemLanguageCode: string,
+): Label => {
+    if (!item.labels.length) {
+        throw new Error();
+    }
+    return item.labels.sort(
+        (a, b) =>
+            rankLabel(b, preferredLanguageCode, systemLanguageCode) -
+            rankLabel(a, preferredLanguageCode, systemLanguageCode),
+    )[0];
+};