Compiling Expressions 17

src/clox/emitter.d

@@ -0,0 +1,51 @@
+module clox.emitter;
+
+import clox.compiler;
+import clox.chunk;
+import clox.value;
+import clox.util;
+import clox.dbg;
+
+import clox.container.varint;
+
+struct Emitter{
+	Compiler* compiler;
+	Chunk* chunk;
+	private uint line;
+	Chunk* currentChunk(){
+		return chunk;
+	}
+	void emit(Args...)(Args args){
+		static foreach(v; args){{
+			static if(is(typeof(v) == OpCode)){
+				auto bytes = v;
+			} else static if(is(typeof(v) == uint)){
+				auto bytes = VarUint(v).bytes;
+			} else {
+				static assert(0);
+			}
+			currentChunk.write(bytes, line);
+		}}
+	}
+	void emitConstant(Value value){
+		emit(OpCode.Constant, makeConstant(value));
+	}
+	void emitReturn(){
+		emit(OpCode.Return);
+	}
+	void endCompiler(){
+		emitReturn();
+		debug(printCode){
+			if(!compiler.parser.hadError)
+				disassembleChunk(currentChunk());
+		}
+	}
+	uint makeConstant(Value value){
+		uint constant = chunk.addConstant(value);
+		return constant;
+	}
+	void setLine(uint l){
+		this.line = l;
+	}
+}
+