public static void ParseLoop()
{
ParseNextLexem();
CodeGens.AddLabel();
string TopLabel = CodeGens.GetCurrentLabel();
CodeGens.AddLabel();
string LowLabel = CodeGens.GetCurrentLabel();
CodeGens.AddLabel();
string Thirdlabel = CodeGens.GetCurrentLabel();
currentLabel = Thirdlabel;
CodeGens.AddInstructions("jmp " + LowLabel);
CodeGens.AddInstructions(TopLabel + ":");
//ParseExpression();
ParseInstructionsSequence();
//
CheckSyntax(Lexems.While);
ParseNextLexem();
CodeGens.AddInstructions(LowLabel + ":");
ParseExpression();
CodeGens.AddInstructions("jmp " + TopLabel);
CodeGens.AddInstructions(Thirdlabel + ":");
//{
// ParseNextLexem();
// CodeGens.AddLabel();
// string label = CodeGens.GetCurrentLabel();
// CodeGens.AddInstructions(label + ":");
// ParseInstructionsSequence();
// CheckLexems(Lexems.While);
// ParseExpression();
//}
}
public static void ParseBranching()
{
// //CheckLexems(Lexems.If);
// ParseNextLexem();
// ParseExpression();
// CodeGens.AddLabel();
// string lowlable=CodeGens.GetCurrentLabel();
// currentLabel=lowlable;
// CheckLexems(Lexems.Then);
// ParseInstructionsSequence();
// while (currentLexem == Lexems.ElseIf)
// {
// ParseExpression();
// CheckLexems(Lexems.Then);
// ParseInstructionsSequence();
// }
// if (currentLexem == Lexems.Else)
// {
// ParseNextLexem();
// ParseInstructionsSequence();
// }
// CheckLexems(Lexems.EndIf);
ParseNextLexem();
CodeGens.AddLabel();
string lowestLabel = CodeGens.GetCurrentLabel();
currentLabel = lowestLabel;
CodeGens.AddLabel();
string exitLabel = CodeGens.GetCurrentLabel();
ParseExpression();
CheckSyntax(Lexems.Then);
ParseInstructionsSequence();
CodeGens.AddInstructions("jmp " + exitLabel);
while (currentLexem == Lexems.ElseIf)
{
CodeGens.AddInstructions(lowestLabel + ":");
CodeGens.AddLabel();
lowestLabel = CodeGens.GetCurrentLabel();
currentLabel = lowestLabel;
ParseNextLexem();
ParseExpression();
CheckSyntax(Lexems.Then);
ParseInstructionsSequence();
CodeGens.AddInstructions("jmp " + exitLabel);
}
if (currentLexem == Lexems.Else)
{
CodeGens.AddInstructions(lowestLabel + ":");
// ParseNextLexem();
ParseInstructionsSequence();
}
CheckSyntax(Lexems.EndIf);
CodeGens.AddInstructions(exitLabel + ":");
}