From d0cf76db293b34db15245dc1ab245bd18c81c8b3 Mon Sep 17 00:00:00 2001
From: Michael Williamson <mike@zwobble.org>
Date: Sat, 6 Feb 2016 13:02:27 +0000
Subject: Implement while loops in C# backend

---
 .../zwobble/couscous/backends/csharp/CsharpSerializer.java   | 12 +++++++++++-
 .../java/org/zwobble/couscous/tests/BackendMethodTests.java  |  2 ++
 .../tests/backends/csharp/CsharpCompilerMethodTests.java     | 10 ----------
 .../tests/backends/csharp/CsharpSerializerTests.java         |  9 +++++++++
 4 files changed, 22 insertions(+), 11 deletions(-)

diff --git a/src/main/java/org/zwobble/couscous/backends/csharp/CsharpSerializer.java b/src/main/java/org/zwobble/couscous/backends/csharp/CsharpSerializer.java
index b16f684..0bd7a21 100644
--- a/src/main/java/org/zwobble/couscous/backends/csharp/CsharpSerializer.java
+++ b/src/main/java/org/zwobble/couscous/backends/csharp/CsharpSerializer.java
@@ -228,7 +228,17 @@ public class CsharpSerializer implements NodeVisitor {
 
     @Override
     public void visit(WhileNode whileLoop) {
-        throw new UnsupportedOperationException();
+        writer.writeStatement(() -> {
+            writer.writeKeyword("while");
+            writer.writeSpace();
+            writer.writeSymbol("(");
+            write(whileLoop.getCondition());
+            writer.writeSymbol(")");
+
+            writer.startBlock();
+            writeAll(whileLoop.getBody());
+            writer.endBlock();
+        });
     }
 
     @Override
diff --git a/src/test/java/org/zwobble/couscous/tests/BackendMethodTests.java b/src/test/java/org/zwobble/couscous/tests/BackendMethodTests.java
index 38627dc..d6d35af 100644
--- a/src/test/java/org/zwobble/couscous/tests/BackendMethodTests.java
+++ b/src/test/java/org/zwobble/couscous/tests/BackendMethodTests.java
@@ -121,6 +121,7 @@ public abstract class BackendMethodTests {
         LocalVariableDeclarationNode x = localVariableDeclaration(TestIds.id("x"), "x", IntegerValue.REF, literal(0));
         LocalVariableDeclarationNode y = localVariableDeclaration(TestIds.id("y"), "y", IntegerValue.REF, literal(2));
         MethodNode.Builder method = staticMethod("hello")
+            .returns(IntegerValue.REF)
             .statement(x)
             .statement(y)
             .statement(whileLoop(
@@ -135,6 +136,7 @@ public abstract class BackendMethodTests {
         LocalVariableDeclarationNode x = localVariableDeclaration(TestIds.id("x"), "x", IntegerValue.REF, literal(0));
         LocalVariableDeclarationNode y = localVariableDeclaration(TestIds.id("y"), "y", IntegerValue.REF, literal(2));
         MethodNode.Builder method = staticMethod("hello")
+            .returns(IntegerValue.REF)
             .statement(x)
             .statement(y)
             .statement(whileLoop(
diff --git a/src/test/java/org/zwobble/couscous/tests/backends/csharp/CsharpCompilerMethodTests.java b/src/test/java/org/zwobble/couscous/tests/backends/csharp/CsharpCompilerMethodTests.java
index d68c349..8817644 100644
--- a/src/test/java/org/zwobble/couscous/tests/backends/csharp/CsharpCompilerMethodTests.java
+++ b/src/test/java/org/zwobble/couscous/tests/backends/csharp/CsharpCompilerMethodTests.java
@@ -11,16 +11,6 @@ public class CsharpCompilerMethodTests extends BackendMethodTests {
     public void methodWithNoStatementsReturnsUnit() {
     }
 
-    @Ignore
-    @Test
-    public void whileLoopIsExecutedWhileConditionIsTrue() {
-    }
-
-    @Ignore
-    @Test
-    public void returnWillExitWhileLoopEarly() {
-    }
-
     @Override
     protected MethodRunner buildMethodRunner() {
         return new CsharpMethodRunner();
diff --git a/src/test/java/org/zwobble/couscous/tests/backends/csharp/CsharpSerializerTests.java b/src/test/java/org/zwobble/couscous/tests/backends/csharp/CsharpSerializerTests.java
index cc686e5..3f4ef60 100644
--- a/src/test/java/org/zwobble/couscous/tests/backends/csharp/CsharpSerializerTests.java
+++ b/src/test/java/org/zwobble/couscous/tests/backends/csharp/CsharpSerializerTests.java
@@ -23,6 +23,7 @@ import static org.zwobble.couscous.ast.TernaryConditionalNode.ternaryConditional
 import static org.zwobble.couscous.ast.ThisReferenceNode.thisReference;
 import static org.zwobble.couscous.ast.VariableDeclaration.var;
 import static org.zwobble.couscous.ast.VariableReferenceNode.reference;
+import static org.zwobble.couscous.ast.WhileNode.whileLoop;
 import static org.zwobble.couscous.util.ExtraLists.list;
 
 public class CsharpSerializerTests {
@@ -178,6 +179,14 @@ public class CsharpSerializerTests {
         assertEquals("if (true) {\n    return 1;\n} else {\n    return 2;\n}\n", output);
     }
 
+    @Test
+    public void whileLoopPrintsConditionAndBody() {
+        String output = serialize(whileLoop(
+            literal(true),
+            list(returns(literal(1)))));
+        assertEquals("while (true) {\n    return 1;\n}\n", output);
+    }
+
     @Test
     public void methodCanHaveVoidReturnType() {
         String output = serialize(MethodNode.staticMethod("nothing")
-- 
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