public While(Condition condition, Statement first, End end)
{
Condition = condition;
FirstStatement = first;
Head = condition;
Tail = end;
}
public If(Condition condition, Statement ifBlock, Statement elseBlock, End end, Node.Coords coords)
{
Condition = condition;
IfBlock = ifBlock;
ElseBlock = elseBlock;
Head = condition;
Tail = end;
this.Coords = coords;
}
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.While While()
{
Nodes.Node.Coords coords = Lexer.Coords;
if (Lexer.LookAhead().LexType != Lexer.LexType.While)
return null;
Lexer.NextLexem();
//Lexer.SkipSpacesCoords();
if (Lexer.LookAhead().LexType != Lexer.LexType.OpenBreaket)
ErrorList.Add(new Error(ParserException.MissedOpenBracket, Lexer.LookBack().EndCoords));
else
Lexer.NextLexem();
Nodes.Condition condition = Condition();
if (Lexer.LookAhead().LexType != Lexer.LexType.CloseBracket)
ErrorList.Add(new Error(ParserException.MissedCloseBracket, Lexer.LookBack().EndCoords));
else
Lexer.NextLexem();
Nodes.End end = new Nodes.End();
Nodes.Statement head = Block(condition);
condition.NextFalse = end;
condition.NextTrue = head.Head;
//Statements.Add(end);
Nodes.While result = new Nodes.While(condition, head, end);
result.Head = result;
result.Tail = result;
result.Coords = coords;
return result;
}
private static Nodes.If If()
{
Nodes.Node.Coords coords = Lexer.Coords;
if (Lexer.LookAhead().LexType != Lexer.LexType.If)
{
return null;
}
Lexer.NextLexem();
//Lexer.SkipSpacesCoords();
if (Lexer.LookAhead().LexType != Lexer.LexType.OpenBreaket)
{
ErrorList.Add(new Error(ParserException.MissedOpenBracket, Lexer.LookBack().EndCoords));
}
else
Lexer.NextLexem();
/*Lexer.Lexem nextLexem = Lexer.LookAhead();
if (nextLexem.LexType != Lexer.LexType.Number && nextLexem.LexType != Lexer.LexType.Variable && nextLexem.LexType != Lexer.LexType.OpenBreaket)
Lexer.NextLexem();*/
Nodes.Condition condition = Condition();
if (Lexer.LookAhead().LexType != Lexer.LexType.CloseBracket)
{
ErrorList.Add(new Error(ParserException.MissedCloseBracket, Lexer.LookBack().EndCoords));
}
else
Lexer.NextLexem();
Nodes.End end = new Nodes.End();
Nodes.Statement ifBlock = Block(end);
Nodes.Statement elseBlock = null;
if (Lexer.LookAhead().LexType == Lexer.LexType.Else)
{
Lexer.NextLexem();
elseBlock = Block(end);
}
condition.NextTrue = ifBlock.Head;
if (elseBlock != null)
condition.NextFalse = elseBlock.Head;
else
condition.NextFalse = end;
//Statements.Add(end);
return new Nodes.If(condition, ifBlock, elseBlock, end, coords);
}
private static Nodes.For For()
{
Nodes.Node.Coords coords = Lexer.Coords;
if (Lexer.LookAhead().LexType != Lexer.LexType.For)
{
return null;
}
Lexer.NextLexem();
//Lexer.SkipSpacesCoords();
if (Lexer.LookAhead().LexType != Lexer.LexType.OpenBreaket)
{
ErrorList.Add(new Error(ParserException.MissedOpenBracket, Lexer.LookBack().EndCoords));
}
else
Lexer.NextLexem();
/*if (Lexer.LookAhead().LexType != Lexer.LexType.Variable)
Lexer.NextLexem();*/
Nodes.Assignment assgn = Assignment();
//Statements.Add(assgn);
if (Lexer.LookAhead().LexType != Lexer.LexType.Semicolon)
ErrorList.Add(new Error(ParserException.NeedSemicolon, Lexer.LookBack().EndCoords));
else
Lexer.NextLexem();
/*Lexer.Lexem nextLexem = Lexer.LookAhead();
if (nextLexem.LexType != Lexer.LexType.Number && nextLexem.LexType != Lexer.LexType.Variable && nextLexem.LexType != Lexer.LexType.OpenBreaket)
Lexer.NextLexem();*/
Nodes.Condition cond = Condition();
assgn.Next = cond;
//Statements.Add(cond);
if (Lexer.LookAhead().LexType != Lexer.LexType.Semicolon)
ErrorList.Add(new Error(ParserException.NeedSemicolon, Lexer.LookBack().EndCoords));
else
Lexer.NextLexem();
/*if (Lexer.LookAhead().LexType != Lexer.LexType.Variable)
Lexer.NextLexem();*/
Nodes.Assignment chngAssgn = Assignment();
chngAssgn.Next = cond;
Nodes.End end = new Nodes.End();
cond.NextFalse = end;
if (Lexer.LookAhead().LexType != Lexer.LexType.CloseBracket)
ErrorList.Add(new Error(ParserException.MissedCloseBracket, Lexer.LookBack().EndCoords));
else
Lexer.NextLexem();
Nodes.Statement FirstStatement = Block(chngAssgn);
cond.NextTrue = FirstStatement.Head;
//Statements.Add(end);
return new Nodes.For(assgn, cond, chngAssgn, FirstStatement, end, coords);
}