JS lib: introduced different output strategies, and chose them depending of environment.

#KT-2994 Fixed

js/js.tests/test/org/jetbrains/k2js/test/rhino/RhinoUtils.java

@@ -140,6 +140,9 @@ public final class RhinoUtils {
         try {
             ScriptableObject scope = getScope(ecmaVersion, context, jsLibraries);
             putGlobalVariablesIntoScope(scope, variables);
+
+            context.evaluateString(scope, "Kotlin.out = new Kotlin.BufferedOutput();", "setup Kotlin.out", 0, null);
+
             for (String filename : fileNames) {
                 runFileWithRhino(filename, context, scope);
                 //String problems = lintIt(context, filename, scope);

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

@@ -130,4 +130,8 @@ public final class NativeInteropTest extends SingleFileTranslationTest {
     public void testNestedElements() throws Exception {
         checkFooBoxIsOk();
     }
+
+    public void testPrint() throws Exception {
+        checkFooBoxIsOk();
+    }
 }

js/js.translator/src/org/jetbrains/k2js/facade/K2JSTranslator.java

@@ -60,8 +60,8 @@ import static org.jetbrains.k2js.facade.FacadeUtils.parseString;
  */
 public final class K2JSTranslator {
 
-    public static final String FLUSH_SYSTEM_OUT = "Kotlin.System.flush();\n";
-    public static final String GET_SYSTEM_OUT = "Kotlin.System.output();\n";
+    public static final String FLUSH_SYSTEM_OUT = "Kotlin.out.flush();\n";
+    public static final String GET_SYSTEM_OUT = "Kotlin.out.buffer;\n";
 
     public static OutputFileCollection translateWithMainCallParameters(
             @NotNull MainCallParameters mainCall,

js/js.translator/testData/kotlin_lib.js

@@ -529,46 +529,87 @@
         return true;
     };
 
-    Kotlin.System = function () {
-        var output = "";
-
-        var print = function (obj) {
-            if (obj !== undefined) {
-                if (obj === null || typeof obj !== "object") {
-                    output += obj;
-                }
-                else {
-                    output += obj.toString();
-                }
-            }
-        };
-        var println = function (obj) {
-            this.print(obj);
-            output += "\n";
-        };
-
-        return {
-            out: function () {
-                return {
-                    print: print,
-                    println: println
-                };
-            },
-            output: function () {
-                return output;
+    var BaseOutput = Kotlin.createClassNow(null, null, {
+            println: function (a) {
+                if (typeof a !== "undefined") this.print(a);
+                this.print("\n");
             },
             flush: function () {
-                output = "";
             }
-        };
+        }
+    );
+
+    Kotlin.NodeJsOutput = Kotlin.createClassNow(BaseOutput,
+        function(outputStream) {
+            this.outputStream = outputStream;
+        }, {
+            print: function (a) {
+                this.outputStream.write(a);
+            }
+        }
+    );
+
+    Kotlin.OutputToConsoleLog = Kotlin.createClassNow(BaseOutput, null, {
+            print: function (a) {
+                console.log(a);
+            },
+            println: function (a) {
+                this.print(typeof a !== "undefined" ? a : "");
+            }
+        }
+    );
+
+    Kotlin.BufferedOutput = Kotlin.createClassNow(BaseOutput,
+        function() {
+            this.buffer = ""
+        }, {
+            print: function (a) {
+                this.buffer += String(a);
+            },
+            flush: function () {
+                this.buffer = "";
+            }
+        }
+    );
+
+    Kotlin.BufferedOutputToConsoleLog = Kotlin.createClassNow(Kotlin.BufferedOutput,
+        function() {
+            Kotlin.BufferedOutput.call(this);
+        }, {
+            print: function (a) {
+                var s = String(a);
+
+                var i = s.lastIndexOf("\n");
+                if (i != -1) {
+                    this.buffer += s.substr(0, i);
+
+                    this.flush();
+
+                    s = s.substr(i + 1);
+                }
+
+                this.buffer += s;
+            },
+            flush: function () {
+                console.log(this.buffer);
+                this.buffer = "";
+            }
+        }
+    );
+    Kotlin.out = function() {
+        var isNode = typeof process !== 'undefined' && process.versions && !!process.versions.node;
+
+        if (isNode) return new Kotlin.NodeJsOutput(process.stdout);
+
+        return new Kotlin.BufferedOutputToConsoleLog();
     }();
 
     Kotlin.println = function (s) {
-        Kotlin.System.out().println(s);
+        Kotlin.out.println(s);
     };
 
     Kotlin.print = function (s) {
-        Kotlin.System.out().print(s);
+        Kotlin.out.print(s);
     };
 
     lazyInitClasses.RangeIterator = Kotlin.createClass(

js/js.translator/testData/native/cases/print.kt

@@ -0,0 +1,63 @@
+package foo
+
+val EXPECTED = """Hello, World
+
+***
+####
+"""
+
+val EXPECTED_NEWLINE_FOR_EACH = """Hello
+, World
+
+
+
+***
+##
+##
+
+"""
+
+native
+fun eval(code: String): Any? = noImpl
+
+native
+var buffer: String = noImpl
+
+fun test(expected: String, initCode: String, getResult: () -> String) {
+    buffer = ""
+
+    eval("Kotlin.out = new $initCode")
+
+    print("Hello")
+    print(", World")
+    print("\n")
+    println()
+    println("***")
+    print("##")
+    print("##")
+    println()
+
+    val actual = getResult()
+
+    assertEquals(expected, actual, initCode)
+}
+
+fun box(): String {
+    test(EXPECTED, "Kotlin.NodeJsOutput(outputStream)") {
+        buffer
+    }
+
+    test(EXPECTED_NEWLINE_FOR_EACH, "Kotlin.OutputToConsoleLog()") {
+        buffer
+    }
+
+    test(EXPECTED, "Kotlin.BufferedOutput()") {
+        eval("Kotlin.out.buffer") as String
+    }
+
+    test(EXPECTED, "Kotlin.BufferedOutputToConsoleLog()") {
+        buffer
+    }
+
+    return "OK"
+}

js/js.translator/testData/native/native/print.js

@@ -0,0 +1,24 @@
+var buffer = "";
+
+function writeToBuffer(a) {
+    var type = typeof a;
+    if (type !== "string") throw Error("Expected string argument type, but got: " + type);
+
+    buffer += a;
+}
+
+function writelnToBuffer(a) {
+    writeToBuffer(a);
+    writeToBuffer("\n");
+}
+
+var GLOBAL = (0, eval)("this");
+
+GLOBAL.console = {
+    log: writelnToBuffer
+};
+
+GLOBAL.outputStream =  {
+    write: writeToBuffer
+};
+