[gen_l10n] Escape quote characters in ARB files (#51952)

dev/benchmarks/test_apps/stocks/lib/i18n/regenerate.md

@@ -17,7 +17,7 @@ for more info.
 
 ```dart
 dart ${FLUTTER_PATH}/dev/tools/localization/bin/gen_l10n.dart --arb-dir=lib/i18n \
-    --template-arb-file=stocks_en_US.arb --output-localization-file=stock_strings.dart \
+    --template-arb-file=stocks_en.arb --output-localization-file=stock_strings.dart \
     --output-class=StockStrings
 ```
 

dev/benchmarks/test_apps/stocks/lib/i18n/stocks_en.arb

@@ -1,5 +1,16 @@
 {
   "title": "Stocks",
+  "@title": {
+    "description": "Title for the Stocks application"
+  },
+
   "market": "MARKET",
-  "portfolio": "PORTFOLIO"
+  "@market": {
+    "description": "Label for the Market tab"
+  },
+
+  "portfolio": "PORTFOLIO",
+  "@portfolio": {
+    "description": "Label for the Portfolio tab"
+  }
 }

dev/benchmarks/test_apps/stocks/lib/i18n/stocks_en_US.arb

@@ -1,16 +1,5 @@
 {
   "title": "Stocks",
-  "@title": {
-    "description": "Title for the Stocks application"
-  },
-
   "market": "MARKET",
-  "@market": {
+  "portfolio": "PORTFOLIO"
-    "description": "Label for the Market tab"
-  },
-
-  "portfolio": "PORTFOLIO",
-  "@portfolio": {
-    "description": "Label for the Portfolio tab"
-  }
 }

dev/tools/localization/gen_l10n.dart

@@ -163,6 +163,11 @@ String generateMethod(Message message, AppResourceBundle bundle) {
         messageValue = messageValue.replaceAll('{${placeholder.name}}', '\${${placeholder.name}}');
       }
     }
+
+    // Escape single and double quotes.
+    messageValue = messageValue.replaceAll("'", '\\\'');
+    messageValue = messageValue.replaceAll('"', '\\\"');
+
     return "'$messageValue'";
   }
 

packages/flutter_tools/test/integration.shard/gen_l10n_test.dart

@@ -101,6 +101,8 @@ void main() {
      '#l10n 22 (Hello World of 101 citizens)\n'
      '#l10n 23 (Hello two worlds with 102 total citizens)\n'
      '#l10n 24 ([Hello] -World- #123#)\n'
+     '#l10n 25 (Flutter\'s amazing!)\n'
+     '#l10n 26 (Flutter is "amazing"!)\n'
      '#l10n END\n'
     );
   });

packages/flutter_tools/test/integration.shard/test_data/gen_l10n_project.dart

@@ -108,6 +108,8 @@ class Home extends StatelessWidget {
                 '${localizations.helloWorldPopulation(1, 101)}',
                 '${localizations.helloWorldPopulation(2, 102)}',
                 '${localizations.helloWorldsInterpolation(123, "Hello", "World")}',
+                '${localizations.singleQuote}',
+                '${localizations.doubleQuote}',
               ]);
               for (final String result in results) {
                 print('#l10n $n ($result)\n');
@@ -286,6 +288,16 @@ void main() {
       "hello": {},
       "world": {}
     }
+  },
+
+  "singleQuote": "Flutter's amazing!",
+  "@singleQuote": {
+    "description": "A message with a single quote."
+  },
+
+  "doubleQuote": "Flutter is \"amazing\"!",
+  "@doubleQuote": {
+    "description": "A message with double quotes."
   }
 }
 ''';