static void Run()
{
if (!File.Exists(inputFile) || Path.GetExtension(inputFile) != ".vm")
{
throw new ArgumentException("Invalid input file");
}
string outputFile = Path.GetDirectoryName(inputFile) + "/" + Path.GetFileNameWithoutExtension(inputFile) + ".asm";
using (var parser = new Parser(inputFile))
using (var codeWriter = new CodeWriter(outputFile))
{
while (parser.HasMoreCommands())
{
parser.Advance();
var type = parser.CommandType();
if (type == CommandTypeEnum.C_ARITHMETIC)
{
codeWriter.WriteArithmetric(parser.Arg1());
}
else if (type == CommandTypeEnum.C_PUSH || type == CommandTypeEnum.C_POP)
{
codeWriter.WritePushPop(type, parser.Arg1(), parser.Arg2());
}
else
{
throw new NotImplementedException();
}
}
}
}
static void Process(Parser parser, CodeWriter codeWriter)
{
while (parser.HasMoreCommands())
{
parser.Advance();
var type = parser.CommandType();
if (type == CommandTypeEnum.C_ARITHMETIC)
{
codeWriter.WriteArithmetric(parser.Arg1());
}
else if (type == CommandTypeEnum.C_PUSH || type == CommandTypeEnum.C_POP)
{
codeWriter.WritePushPop(type, parser.Arg1(), parser.Arg2());
}
else if (type == CommandTypeEnum.C_LABEL)
{
codeWriter.WriteLabel(parser.Arg1());
}
else if (type == CommandTypeEnum.C_GOTO)
{
codeWriter.WriteGoto(parser.Arg1());
}
else if (type == CommandTypeEnum.C_IF)
{
codeWriter.WriteIf(parser.Arg1());
}
else if (type == CommandTypeEnum.C_FUNCTION)
{
codeWriter.WriteFunction(parser.Arg1(), parser.Arg2());
}
else if (type == CommandTypeEnum.C_CALL)
{
codeWriter.WriteCall(parser.Arg1(), parser.Arg2());
}
else
{
codeWriter.WriteReturn();
}
}
}