private static ProgramInstruction ParseInstruction(ReadBuffer buffer)
{
buffer.SkipSpace();
String instructionField = ReadField(buffer);
return(ProgramInstruction.Parse(instructionField));
}
private ProgramLine(String text, Label label, ProgramInstruction instruction, String errorMessage)
{
m_text = text;
m_label = label;
m_instruction = instruction;
m_errorMessage = errorMessage;
}
private static void ReadOperand(ProgramInstruction instruction, ReadBuffer buffer)
{
buffer.SkipSpace();
// ';' ならば、そのあとはコメントなので、オペランドとして解釈しない。
if (buffer.Current == Casl2Defs.Semicolon)
{
buffer.SkipToEnd();
}
instruction.ReadOperand(buffer);
}
// 命令行
// オペランドあり: [ラベル] {空白} {命令コード} {空白} {オペランド} [ {空白} [コメント]]
// オペランドなし: [ラベル] {空白} {命令コード} [ {空白} [ {;} [コメント]]]
private static ProgramLine ParseInstructionLine(String text)
{
ReadBuffer buffer = new ReadBuffer(text);
Label label = ParseLabel(buffer);
ProgramInstruction instruction = ParseInstruction(buffer);
ReadOperand(instruction, buffer);
return(MakeInstructionLine(text, label, instruction));
}
internal static ProgramInstruction Make(String instructionField)
{
if (instructionField.Length == 0)
{
String message = Resources.MSG_NoInstructionInInstructionLine;
throw new Casl2SimulatorException(message);
}
if (!m_factoryMethodDictionary.ContainsKey(instructionField))
{
String message = String.Format(Resources.MSG_InstructionNotDefined, instructionField);
throw new Casl2SimulatorException(message);
}
Func <ProgramInstruction> factoryMethod = m_factoryMethodDictionary[instructionField];
ProgramInstruction instruction = factoryMethod();
return(instruction);
}
private static ProgramLine MakeInstructionLine(String text, Label label, ProgramInstruction instruction)
{
return(new ProgramLine(text, label, instruction, null));
}
