private static Nodes.Assignment ArrayAssignment(Lexer.Lexem currLexem, Nodes.Node.Coords coords)
{
Nodes.Expression index = Expr();
if (Lexer.LookAhead().LexType != Lexer.LexType.CloseSquadBracket)
ErrorList.Add(new Error(ParserException.NeedCloseSquadBracket, Lexer.LookBack().EndCoords));
else
Lexer.NextLexem();
if (Lexer.LookAhead().LexType == Lexer.LexType.EqualSign)
{
Lexer.NextLexem();
Nodes.Expression value = Expr();
/*if (Lexer.LookAhead().LexType != Lexer.LexType.Semicolon)
ErrorList.Add(new Error(ParserException.NeedSemicolon, Lexer.LookBack().EndCoords));
else
Lexer.NextLexem();*/
Nodes.Assignment result = new Nodes.Assignment(new Nodes.ElementOfArray(currLexem.VarName, index), value, coords);
result.Head = result;
result.Tail = result;
return result;
}
else
{
while (Lexer.LookBack().LexType != Lexer.LexType.Variable)
Lexer.RollBack();
Lexer.RollBack();
return null;
}
}
public For(Assignment assn, Condition cond, Assignment chngAssn, Statement first, End end, Node.Coords coords)
{
Assignment = assn;
Condition = cond;
ChngAssignment = chngAssn;
FirstStatement = first;
Head = assn;
Tail = end;
this.Coords = coords;
}
private static Nodes.Assignment Assignment()
{
Nodes.Node.Coords coords = Lexer.Coords;
if (Lexer.LookAhead().LexType != Lexer.LexType.Variable)
return null;
Lexer.Lexem currLexem = Lexer.NextLexem();
if (Lexer.LookAhead().LexType == Lexer.LexType.EqualSign)
{
Lexer.NextLexem();
if (Lexer.LookAhead().LexType == Lexer.LexType.String)
{
Nodes.Expression strValue = Expr();
/*if (Lexer.LookAhead().LexType != Lexer.LexType.Semicolon)
ErrorList.Add(new Error(ParserException.NeedSemicolon, Lexer.LookBack().EndCoords));
else
Lexer.NextLexem();*/
Nodes.Assignment result = new Nodes.Assignment(new Nodes.Variable(currLexem.VarName), strValue, coords);
result.Head = result;
result.Tail = result;
return result;
}
else
return VariableAssignment(currLexem, coords);
}
else
if (Lexer.LookAhead().LexType == Lexer.LexType.OpenSquadBracket)
{
Lexer.NextLexem();
return ArrayAssignment(currLexem, coords);
}
else
{
Lexer.RollBack();
return null;
}
}
private static Nodes.Assignment VariableAssignment(Lexer.Lexem currLexem, Nodes.Node.Coords coords)
{
Nodes.Expression value = Expr();
/*if (Lexer.LookAhead().LexType != Lexer.LexType.Semicolon)
{
throw new ParserException();
}
Lexer.NextLexem();*/
/*if (Lexer.LookAhead().LexType != Lexer.LexType.Semicolon)
ErrorList.Add(new Error(ParserException.NeedSemicolon, Lexer.LookBack().EndCoords));
else
Lexer.NextLexem();*/
Nodes.Assignment result = new Nodes.Assignment(new Nodes.IntVar(currLexem.VarName), value, coords);
//Statements.Add(result);
result.Head = result;
result.Tail = result;
return result;
}
