From c7bdef1657849d1389383a09f1a4eea7540689bf Mon Sep 17 00:00:00 2001
From: isc-auf <frederic.aubert@isc-ejpd.admin.ch>
Date: Wed, 15 Jan 2025 20:55:40 +0100
Subject: [PATCH] feat(transloco): allow method calls with transpiled arguments
 in DefaultTranspiler (#830)

Signed-off-by: isc-auf <frederic.aubert@isc-ejpd.admin.ch>
---
 libs/transloco/src/lib/helpers.ts               | 12 +++++++++++-
 libs/transloco/src/lib/tests/transpiler.spec.ts | 15 +++++++++++++++
 2 files changed, 26 insertions(+), 1 deletion(-)

diff --git a/libs/transloco/src/lib/helpers.ts b/libs/transloco/src/lib/helpers.ts
index 8d6df607..ce16429f 100644
--- a/libs/transloco/src/lib/helpers.ts
+++ b/libs/transloco/src/lib/helpers.ts
@@ -1,4 +1,5 @@
 import { ProviderScope, Translation } from './types';
+import { getFunctionArgs } from './transloco.transpiler';
 
 export function getValue<T>(obj: T, path: keyof T) {
   if (!obj) {
@@ -10,7 +11,16 @@ export function getValue<T>(obj: T, path: keyof T) {
     return obj[path];
   }
 
-  return (path as string).split('.').reduce((p, c) => p?.[c], obj as any);
+  const pathMatcher = /\s*(\w+)(?:\((.*?)\))?\s*/;
+  return (path as string).split('.').reduce((p, c) => {
+    const match = pathMatcher.exec(c);
+    if (p && match) {
+      return isDefined(match[2])
+        ? p[match[1]](...getFunctionArgs(match[2]))
+        : p[match[1]];
+    }
+    return undefined;
+  }, obj as any);
 }
 
 export function setValue(obj: any, prop: string, val: any) {
diff --git a/libs/transloco/src/lib/tests/transpiler.spec.ts b/libs/transloco/src/lib/tests/transpiler.spec.ts
index 1f212c87..2e6dceb7 100644
--- a/libs/transloco/src/lib/tests/transpiler.spec.ts
+++ b/libs/transloco/src/lib/tests/transpiler.spec.ts
@@ -303,6 +303,21 @@ describe('TranslocoTranspiler', () => {
         ).toEqual('From 1 to 10');
       });
 
+      it('should support params method calls', () => {
+        expect(
+          transpiler.transpile(
+            getTranspilerParams(
+              `Length: ${wrapParam('text.length')}, Initial: ${wrapParam('text.charAt(0)')}`,
+              {
+                params: {
+                  text: 'Hello world',
+                },
+              },
+            ),
+          ),
+        ).toEqual('Length: 11, Initial: H');
+      });
+
       it('should support key referencing', () => {
         const lang = flatten({
           ab: `a b ${wrapParam('cd')}`,