fix: allow setting the placeholder type for nls (#5584)

Author: akoreman

src/config_test.js

@@ -53,8 +53,7 @@ module.exports = {
         var nls = config.nls;
         config.setMessages({
             foo: "hello world of $1",
-            test_key: "hello world for test key",
-            test_with_curly_brackets: "hello world $0 of {1} and $2 to the {3} degree"
+            test_key: "hello world for test key"
         });
         assert.equal(nls("untranslated_key","bar $1"), "bar $1");
         assert.equal(nls("untranslated_key", "bar"), "bar");
@@ -63,7 +62,25 @@ module.exports = {
         assert.equal(nls("untranslated_key", "$0B is $1$$", [0.11, 22]), "0.11B is 22$");
         assert.equal(nls("untranslated_key_but_translated_default_string", "foo", {1: "goo"}), "hello world of goo");
         assert.equal(nls("test_key", "this text should not appear"), "hello world for test key");
-        assert.equal(nls("test_with_curly_brackets", "hello world $0 of {1} and $2 to the {3} degree", ["foo", "bar", "yay", "third"]), "hello world foo of bar and yay to the third degree");
+    },
+    "test: nls setting nlsPlaceholders": function() {
+        var nls = config.nls;
+
+        // Should default to using dollar signs
+        config.setMessages({
+            test_with_curly_brackets: "hello world $0 of {0} and $1 to the {1} degree"
+        });
+        assert.equal(nls("test_with_curly_brackets", "hello world $0 of {1} and $1 to the {1} degree", ["bar", "third"]), "hello world bar of {0} and third to the {1} degree");
+
+        config.setMessages({
+            test_with_curly_brackets: "hello world $0 of {0} and $1 to the {1} degree"
+        }, {placeholders: "curlyBrackets"});
+        assert.equal(nls("test_with_curly_brackets", "hello world $0 of {1} and $1 to the {1} degree", ["bar", "third"]), "hello world $0 of bar and $1 to the third degree");
+
+        config.setMessages({
+            test_with_curly_brackets: "hello world $0 of {0} and $1 to the {1} degree"
+        }, {placeholders: "dollarSigns"});
+        assert.equal(nls("test_with_curly_brackets", "hello world $0 of {1} and $1 to the {1} degree", ["bar", "third"]), "hello world bar of {0} and third to the {1} degree");
     },
     "test: define options" : function() {
         var o = {};

src/lib/app_config.js

@@ -59,11 +59,13 @@ function warn(message) {
 }
 
 var messages;
+var nlsPlaceholders;
 
 class AppConfig {
     constructor() {
             this.$defaultOptions = {};
             messages = defaultEnglishMessages;
+            nlsPlaceholders = "dollarSigns";
         }
 
     /**
@@ -138,9 +140,13 @@ class AppConfig {
 
     /**
      * @param {any} value
+     * @param {{placeholders?: "dollarSigns" | "curlyBrackets"}} [options]
      */
-    setMessages(value) {
+    setMessages(value, options) {
         messages = value;
+        if (options && options.placeholders) {
+            nlsPlaceholders = options.placeholders;
+        }
     }
 
     /**
@@ -159,15 +165,19 @@ class AppConfig {
         var translated = messages[key] || messages[defaultString] || defaultString;
         if (params) {
             // We support both $n or {n} as placeholder indicators in the provided translated strings
-            // Replace $n with the nth element in params
-            translated = translated.replace(/\$(\$|[\d]+)/g, function(_, dollarMatch) {
-                if (dollarMatch == "$") return "$";
-                return params[dollarMatch];
-            });
-             // Replace {n} with the nth element in params
-            translated = translated.replace(/\{([^\}]+)\}/g, function(_, curlyBracketMatch) {
-                return params[curlyBracketMatch];
-            });
+            if (nlsPlaceholders === "dollarSigns") {
+                // Replace $n with the nth element in params
+                translated = translated.replace(/\$(\$|[\d]+)/g, function(_, dollarMatch) {
+                    if (dollarMatch == "$") return "$";
+                    return params[dollarMatch];
+                });
+            }
+            if (nlsPlaceholders === "curlyBrackets") {
+                // Replace {n} with the nth element in params
+                translated = translated.replace(/\{([^\}]+)\}/g, function(_, curlyBracketMatch) {
+                    return params[curlyBracketMatch];
+                });
+            }
         }
         return translated;
     }