Add quotes to toString representation of a String literal

platform/android/MapboxGLAndroidSDK/src/main/java/com/mapbox/mapboxsdk/style/expressions/Expression.java

@@ -2834,8 +2834,8 @@ public static Expression floor(Number number) {
    * CircleLayer circleLayer = new CircleLayer("layer-id", "source-id");
    * circleLayer.setProperties(
    * circleColor(switchCase(
-     eq(literal("it"), resolvedLocale(collator(true, true, "it"))), literal(ColorUtils.colorToRgbaString(Color.GREEN)),
-          literal(ColorUtils.colorToRgbaString(Color.RED))))
+   * eq(literal("it"), resolvedLocale(collator(true, true, "it"))), literal(ColorUtils.colorToRgbaString(Color.GREEN)),
+   * literal(ColorUtils.colorToRgbaString(Color.RED))))
    * );
    * }
    * </pre>
@@ -3921,13 +3921,10 @@ public String toString() {
 
           // special case for handling unusual input like 'rgba(r, g, b, a)'
           if (literalValue instanceof String) {
-            if (((String) literalValue).contains(",")) {
-              builder.append("\"").append(literalValue).append("\"");
-              continue;
-            }
+            builder.append("\"").append(literalValue).append("\"");
+          } else {
+            builder.append(literalValue);
           }
-
-          builder.append(literalValue);
         } else {
           builder.append(argument.toString());
         }

platform/android/MapboxGLAndroidSDK/src/test/java/com/mapbox/mapboxsdk/style/expressions/ExpressionTest.java

@@ -1101,7 +1101,7 @@ public void testCubicBezierExpressionLiteral() throws Exception {
 
   @Test
   public void testExpressionConcatToString() throws Exception {
-    String expected = "[\"concat\", foo, bar]";
+    String expected = "[\"concat\", \"foo\", \"bar\"]";
     String actual = concat(literal("foo"), literal("bar")).toString();
     assertEquals("toString should match", expected, actual);
   }
@@ -1116,7 +1116,7 @@ public void testExpressionMinToString() throws Exception {
   @Test
   public void testExpressionExponentialToString() throws Exception {
     String expected = "[\"interpolate\", [\"cubic-bezier\", 1.0, 1.0, 1.0, 1.0],"
-      + " [\"get\", x], 0.0, 100.0, 100.0, 200.0]";
+      + " [\"get\", \"x\"], 0.0, 100.0, 100.0, 200.0]";
     String actual = interpolate(cubicBezier(literal(1), literal(1), literal(1), literal(1)),
       get(literal("x")), literal(0), literal(100), literal(100), literal(200)).toString();
     assertEquals("toString should match", expected, actual);
@@ -1367,4 +1367,11 @@ public void testStringNestedCollator() {
     String actual = collator(literal(false), eq(literal(2), literal(1)), literal("it")).toString();
     assertEquals("expression should match", expected, actual);
   }
+
+  @Test
+  public void testStringReverseConversion() {
+    String expected = "[\"to-string\", [\"get\", \"name_en\"]]";
+    String actual = Expression.toString(get("name_en")).toString();
+    assertEquals("Reverse string conversion should match", expected, actual);
+  }
 }