Scanning on Demand 16

src/clox/main.d

@@ -1,38 +1,46 @@
 module clox.main;
 
 import std.stdio;
+import std.file;
 
 import clox.chunk;
 import clox.dbg;
 import clox.vm;
 
-int main(string[] argv){
-	Chunk chunk;
+extern(C) int isatty(int);
 
-	ubyte constant = chunk.addConstant(1.2);
-	chunk.write(OpCode.Constant);
-	chunk.write(constant);
-
-	constant = chunk.addConstant(3.4);
-	chunk.write(OpCode.Constant);
-	chunk.write(constant);
-
-	chunk.write(OpCode.Add);
-
-	constant = chunk.addConstant(5.6);
-	chunk.write(OpCode.Constant);
-	chunk.write(constant);
-
-	chunk.write(OpCode.Divide);
-
-	chunk.write(OpCode.Negate);
-
-	chunk.write(OpCode.Return);
-
-	VM vm = VM(0);
-	vm.interpret(&chunk);
-
-
-	return 0;
+struct Lox{
+	VM vm;
+	this(int _){
+		vm = VM(0);
+	}
+	int runFile(string path){
+		string source = path.readText();
+		VM.InterpretResult result = vm.interpret(source);
+		final switch(result){
+			case VM.InterpretResult.CompileError: return 65;
+			case VM.InterpretResult.RuntimeError: return 70;
+			case VM.InterpretResult.Ok: return 0;
+		}
+	}
+	int runPrompt(){
+		while(true){
+			write("> ");
+			string line = stdin.readln();
+			if(!line){
+				writeln();
+				return 0;
+			}
+			vm.interpret(line);
+		}
+	}
+}
+
+int main(string[] argv){
+	Lox lox = Lox(0);
+	if(isatty(stdin.fileno))
+		return lox.runPrompt();
+	else
+		return lox.runFile("/dev/stdin");
 }