Implement CharSequence.isEmpty method in stdlib.js. Remove corresponding intrinsic.

js/js.libraries/src/core/string.kt

@@ -48,8 +48,6 @@ native public fun String.match(regex : String) : Array<String> = noImpl
 native("length")
 public val CharSequence.size: Int get() = noImpl
 
-library
-public fun CharSequence.isEmpty(): Boolean = noImpl
 
 
 

js/js.libraries/src/core/stringsCode.kt

@@ -43,6 +43,7 @@ public inline fun String.matches(regex : String) : Boolean {
     return result != null && result.size() > 0
 }
 
+public inline fun CharSequence.isEmpty(): Boolean = this.length() == 0
 
 public fun String.isBlank(): Boolean = length() == 0 || matches("^[\\s\\xA0]+$")
 

js/js.translator/src/org/jetbrains/kotlin/js/translate/intrinsic/functions/factories/CompositeFIF.java

@@ -35,16 +35,6 @@ public abstract class CompositeFIF implements FunctionIntrinsicFactory {
     @NotNull
     public static final FunctionIntrinsic LENGTH_PROPERTY_INTRINSIC = new BuiltInPropertyIntrinsic("length");
     public static final FunctionIntrinsic MESSAGE_PROPERTY_INTRINSIC = new BuiltInPropertyIntrinsic("message");
-    public static final FunctionIntrinsic IS_EMPTY_INTRINSIC = new FunctionIntrinsic() {
-        @NotNull
-        @Override
-        public JsExpression apply(
-                @Nullable JsExpression receiver, @NotNull List<JsExpression> arguments, @NotNull TranslationContext context
-        ) {
-            assert receiver != null;
-            return JsAstUtils.equality(new JsNameRef("length", receiver), context.program().getNumberLiteral(0));
-        }
-    };
 
     @NotNull
     private final List<Pair<Predicate<FunctionDescriptor>, FunctionIntrinsic>> patternsAndIntrinsics = Lists.newArrayList();

js/js.translator/src/org/jetbrains/kotlin/js/translate/intrinsic/functions/factories/StringOperationFIF.java

@@ -31,6 +31,5 @@ public final class StringOperationFIF extends CompositeFIF {
         add(pattern("kotlin", "CharSequence", "charAt").checkOverridden(), new BuiltInFunctionIntrinsic("charAt"));
         add(pattern("kotlin", "CharSequence", "length").checkOverridden(), LENGTH_PROPERTY_INTRINSIC);
         add(pattern("kotlin", "CharSequence", "subSequence").checkOverridden(), new BuiltInFunctionIntrinsic("substring"));
-        add(pattern("kotlin.js", "isEmpty").isExtensionOf("kotlin.CharSequence"), IS_EMPTY_INTRINSIC);
     }
 }