Add hacktastic support for primitive static methods in C#

3 files changed, 68 insertions, 9 deletions

diff --git a/src/main/java/org/zwobble/couscous/backends/csharp/CsharpPrimitiveMethods.java b/src/main/java/org/zwobble/couscous/backends/csharp/CsharpPrimitiveMethods.java
new file mode 100644
index 0000000..b53560d
--- /dev/null
+++ b/src/main/java/org/zwobble/couscous/backends/csharp/CsharpPrimitiveMethods.java
@@ -0,0 +1,42 @@
+package org.zwobble.couscous.backends.csharp;
+
+import com.google.common.collect.ImmutableMap;
+import org.zwobble.couscous.ast.ExpressionNode;
+import org.zwobble.couscous.ast.TypeName;
+import org.zwobble.couscous.backends.SourceCodeWriter;
+import org.zwobble.couscous.values.ObjectValues;
+
+import java.util.List;
+import java.util.Map;
+import java.util.Optional;
+
+public class CsharpPrimitiveMethods {
+    private static final Map<String, PrimitiveStaticMethodGenerator> STATIC_INT_METHODS =
+        ImmutableMap.<String, PrimitiveStaticMethodGenerator>builder()
+
+            .put("parseInt", (arguments, writer) -> {
+                writer.writeIdentifier("int");
+                writer.writeSymbol(".");
+                writer.writeIdentifier("Parse");
+                writer.writeSymbol("(");
+                writer.writeIdentifier(CsharpSerializer.serialize(arguments.get(0), ""));
+                writer.writeSymbol(")");
+            })
+
+            .build();
+
+    private static final Map<TypeName, Map<String, PrimitiveStaticMethodGenerator>> STATIC_METHODS =
+        ImmutableMap.<TypeName, Map<String, PrimitiveStaticMethodGenerator>>builder()
+            .put(ObjectValues.BOXED_INT, STATIC_INT_METHODS)
+            .build();
+
+    public static Optional<PrimitiveStaticMethodGenerator> getPrimitiveStaticMethod(TypeName type, String methodName) {
+        return Optional.ofNullable(STATIC_METHODS.get(type))
+            .flatMap(methodsForType -> Optional.ofNullable(methodsForType.get(methodName)));
+    }
+
+    @FunctionalInterface
+    public interface PrimitiveStaticMethodGenerator {
+        void generate(List<ExpressionNode> arguments, SourceCodeWriter writer);
+    }
+}
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 6dc7c34..275ae13 100644
--- a/src/main/java/org/zwobble/couscous/backends/csharp/CsharpSerializer.java
+++ b/src/main/java/org/zwobble/couscous/backends/csharp/CsharpSerializer.java
@@ -117,10 +117,32 @@ public class CsharpSerializer implements NodeVisitor {
 
     @Override
     public void visit(MethodCallNode methodCall) {
-        write(methodCall.getReceiver());
-        writer.writeSymbol(".");
-        writer.writeIdentifier(methodCall.getMethodName());
-        writeArguments(methodCall.getArguments());
+        if (!writePrimitiveMethod(methodCall)) {
+            write(methodCall.getReceiver());
+            writer.writeSymbol(".");
+            writer.writeIdentifier(methodCall.getMethodName());
+            writeArguments(methodCall.getArguments());
+        }
+    }
+
+    private boolean writePrimitiveMethod(MethodCallNode methodCall) {
+        return methodCall.getReceiver().accept(new Receiver.Mapper<Boolean>() {
+            @Override
+            public Boolean visit(ExpressionNode receiver) {
+                return false;
+            }
+
+            @Override
+            public Boolean visit(TypeName receiver) {
+                // TODO: transform AST before serialisation instead of exposing write to CsharpPrimitiveMethods
+                return CsharpPrimitiveMethods.getPrimitiveStaticMethod(receiver, methodCall.getMethodName())
+                    .map(generator -> {
+                        generator.generate(methodCall.getArguments(), writer);
+                        return true;
+                    })
+                    .orElse(false);
+            }
+        });
     }
 
     @Override
diff --git a/src/test/java/org/zwobble/couscous/tests/backends/csharp/CsharpCompilerEvalTests.java b/src/test/java/org/zwobble/couscous/tests/backends/csharp/CsharpCompilerEvalTests.java
index 56897e1..24588df 100644
--- a/src/test/java/org/zwobble/couscous/tests/backends/csharp/CsharpCompilerEvalTests.java
+++ b/src/test/java/org/zwobble/couscous/tests/backends/csharp/CsharpCompilerEvalTests.java
@@ -32,11 +32,6 @@ public class CsharpCompilerEvalTests extends BackendEvalTests {
 
     @Test
     @Ignore
-    public void canCallBuiltinStaticMethod() {
-    }
-
-    @Test
-    @Ignore
     public void canCallStaticMethodFromUserDefinedStaticMethod() {
     }