// "for" "(" <exp-option> ";" <exp-option> ";" <exp-option> ")" <statement>
public For Parse(Stack <Token> tokens)
{
tokens.Pop();
var token = tokens.Pop();
if (token.Name != TokenLibrary.Words.OpenParenthesis)
{
throw new SyntaxException("expected (");
}
var nextToken = tokens.Peek();
// if the next token is a variable type
if (nextToken.Name == TokenLibrary.Words.Int)
{
return(new ForDeclare(Scope).Parse(tokens));
}
Initialise = new OptionalSemicolon(Scope).Parse(tokens);
Condition = new OptionalSemicolon(Scope).Parse(tokens);
// ensuring non zero expression
if (Condition.GetType() == typeof(OptionalSemicolon))
{
Condition = new Constant(Scope, 1);
}
PostExpression = new OptionalCloseParam(Scope).Parse(tokens);
Statement = new Statement(new Scope(Scope)).Parse(tokens);
return(this);
}
public ForDeclare Parse(Stack<Token> tokens)
{
Initialise = new Declare(Scope).Parse(tokens);
Condition = new OptionalSemicolon(Scope).Parse(tokens);
PostExpression = new OptionalCloseParam(Scope).Parse(tokens);
Statement = new Statement(Scope).Parse(tokens);
return this;
}