JS backend: fixed String.split for the case when using regexp.

Added(overload) String.split with limit parameter.

js/js.libraries/src/core/javalang.kt

@@ -3,15 +3,18 @@ package java.lang
 import java.io.IOException
 import js.library
 
+library("splitString")
+public fun String.split(regex : String) : Array<String> = js.noImpl
+
+library("splitString")
+public fun String.split(regex : String, limit: Int) : Array<String> = js.noImpl
+
 library
 open public class Exception(message: String? = null) : Throwable() {}
 
 library
 open public class RuntimeException(message: String? = null) : Exception(message) {}
 
-library("splitString")
-public fun String.split(regex : String) : Array<String> = js.noImpl
-
 library
 public class IllegalArgumentException(message: String? = null) : Exception() {}
 

js/js.tests/test/org/jetbrains/k2js/test/semantics/StringTest.java

@@ -80,4 +80,8 @@ public final class StringTest extends AbstractExpressionTest {
             assertFalse(filePath + " should not contain toString calls", text.contains("toString"));
         }
     }
+
+    public void testStringSplit() throws Exception {
+        checkFooBoxIsOk();
+    }
 }

js/js.translator/testFiles/expression/string/cases/stringSplit.kt

@@ -0,0 +1,34 @@
+package foo
+
+// todo drop
+class Pair<F, S>(val first: F, val second: S)
+fun <F, S> F.to(second: S): Pair<F, S> = Pair(this, second)
+
+fun box(): String {
+    val testInput = "test data\t1foo  2 bar"
+    val tests = array(
+      " "     to array("test", "data\t1foo", "", "2", "bar"),
+      "\\s+"  to array("test", "data", "1foo", "2", "bar"),
+      "[sd]"  to array("te", "t ", "ata\t1foo  2 bar"),
+      "[\\d]" to array("test data\t", "foo  ", " bar")
+    )
+
+    for (test in tests) {
+      val regexp = test.first
+      val expected = test.second
+      val result = testInput.split(regexp)
+
+      if (result != expected) return "Wrong result for '$regexp' -- Expected: $expected | Actual: $result"
+    }
+
+    for (test in tests) {
+      val regexp = test.first
+      val limit = 2
+      val expected = Array(limit) { test.second[it] }
+      val result = testInput.split(regexp, limit)
+
+      if (result != expected) return "Wrong result for '$regexp' -- Expected: $expected | Actual: $result"
+    }
+
+    return "OK"
+}

js/js.translator/testFiles/kotlin_lib.js

@@ -482,8 +482,8 @@ String.prototype.contains = function (s) {
             }
     );
 
-    Kotlin.splitString = function (str, regex) {
+    Kotlin.splitString = function (str, regex, limit) {
-        return str.split(regex);
+        return str.split(new RegExp(regex), limit);
     };
 
     Kotlin.nullArray = function (size) {