fix: 🐛 support deep properties keyed with dots

✅ Closes: #129

.eslintrc

@@ -5,7 +5,8 @@
     "jest": true
   },
   "rules": {
-    "@typescript-eslint/no-explicit-any": "off"
+    "@typescript-eslint/no-explicit-any": "off",
+    "line-comment-position": "off"
   },
   "overrides": [
     {

package.json

@@ -102,7 +102,6 @@
   },
   "dependencies": {
     "deepmerge": "^4.2.2",
-    "dlv": "^1.1.3",
     "estree-walker": "^2.0.1",
     "intl-messageformat": "^9.3.15",
     "sade": "^1.7.4",

src/cli/extract.ts

@@ -10,11 +10,11 @@ import type {
 import { walk } from 'estree-walker';
 import type { Ast } from 'svelte/types/compiler/interfaces';
 import { parse } from 'svelte/compiler';
-import dlv from 'dlv';
 
 import { deepSet } from './includes/deepSet';
 import { getObjFromExpression } from './includes/getObjFromExpression';
 import type { Message } from './types';
+import { delve } from '../shared/delve';
 
 const LIB_NAME = 'svelte-i18n';
 const DEFINE_MESSAGES_METHOD_NAME = 'defineMessages';
@@ -189,7 +189,7 @@ export function extractMessages(
     } else {
       if (
         overwrite === false &&
-        typeof dlv(accumulator, messageObj.id) !== 'undefined'
+        typeof delve(accumulator, messageObj.id) !== 'undefined'
       ) {
         return;
       }

src/runtime/stores/dictionary.ts

@@ -1,9 +1,9 @@
 import { writable, derived } from 'svelte/store';
 import deepmerge from 'deepmerge';
-import dlv from 'dlv';
 
 import type { LocaleDictionary, LocalesDictionary } from '../types/index';
 import { getFallbackOf } from './locale';
+import { delve } from '../../shared/delve';
 
 let dictionary: LocalesDictionary;
 const $dictionary = writable<LocalesDictionary>({});
@@ -27,13 +27,7 @@ export function getMessageFromDictionary(locale: string, id: string) {
 
   const localeDictionary = getLocaleDictionary(locale);
 
-  // flat ids
-  if (id in localeDictionary) {
-    return localeDictionary[id];
-  }
-
-  // deep ids
-  const match = dlv(localeDictionary, id);
+  const match = delve(localeDictionary, id);
 
   return match;
 }

src/shared/delve.ts

@@ -0,0 +1,27 @@
+export function delve(obj: Record<string, unknown>, fullKey: string) {
+  if (fullKey in obj) {
+    return obj[fullKey];
+  }
+
+  const keys = fullKey.split('.');
+  let result: any = obj;
+
+  for (let p = 0; p < keys.length; p++) {
+    if (typeof result === 'object') {
+      if (p > 0) {
+        const partialKey = keys.slice(p, keys.length).join('.');
+
+        if (partialKey in result) {
+          result = result[partialKey];
+          break;
+        }
+      }
+
+      result = result[keys[p]];
+    } else {
+      result = undefined;
+    }
+  }
+
+  return result;
+}

test/runtime/stores/dictionary.test.ts

@@ -97,7 +97,7 @@ describe('getting messages', () => {
     expect(getMessageFromDictionary('en', 'messages.1')).toBe('Other message');
   });
 
-  it('accepts english in dictionary keys', () => {
+  it('gets a shallow message keyed with dots', () => {
     addMessages('pt', {
       'Hey man. How are you today?': 'E ai cara, como você vai hoje?',
     });
@@ -106,8 +106,34 @@ describe('getting messages', () => {
     );
   });
 
+  it('gets a deep message keyed with dots', () => {
+    addMessages('pt', {
+      WCAG: {
+        SUCCESS_CRITERION: {
+          '1.1.1': '1.1.1',
+          '1.2.1': '1.2.1',
+          '1.3.1': '1.3.1',
+          not: null,
+        },
+      },
+    });
+
+    expect(getMessageFromDictionary('pt', 'WCAG.SUCCESS_CRITERION.1.3.1')).toBe(
+      '1.3.1',
+    );
+    expect(
+      getMessageFromDictionary('pt', 'WCAG.SUCCESS_CRITERION.not'),
+    ).toBeNull();
+    expect(
+      getMessageFromDictionary(
+        'pt',
+        'WCAG.SUCCESS_CRITERION.1.3.1.not.existing',
+      ),
+    ).toBeUndefined();
+  });
+
   it('returns undefined for missing messages', () => {
     addMessages('en', {});
-    expect(getMessageFromDictionary('en', 'foo')).toBeUndefined();
+    expect(getMessageFromDictionary('en', 'foo.potato')).toBeUndefined();
   });
 });

test/runtime/stores/formatters.test.ts

@@ -1,3 +1,4 @@
+/* eslint-disable line-comment-position */
 import { get } from 'svelte/store';
 
 import type {

yarn.lock

@@ -2450,11 +2450,6 @@ dir-glob@^3.0.1:
   dependencies:
     path-type "^4.0.0"
 
-dlv@^1.1.3:
-  version "1.1.3"
-  resolved "https://registry.yarnpkg.com/dlv/-/dlv-1.1.3.tgz#5c198a8a11453596e751494d49874bc7732f2e79"
-  integrity sha512-+HlytyjlPKnIG8XuRG8WvmBP8xs8P71y+SKKS6ZXWoEgLuePxtDoUEiH7WkdePWrQ5JBpE6aoVqfZfJUQkjXwA==
-
 doctrine@1.5.0:
   version "1.5.0"
   resolved "https://registry.yarnpkg.com/doctrine/-/doctrine-1.5.0.tgz#379dce730f6166f76cefa4e6707a159b02c5a6fa"