public While(Expr condition, Stmt body)
{
Condition = condition;
Body = body;
}
public StmtIf(Expr _condition, Stmt _thenBranch, Stmt _elseBranch)
{
condition = _condition;
thenBranch = _thenBranch;
elseBranch = _elseBranch;
}
void execute(Stmt s)
{
s.accept(this);
}
private void Execute(Stmt stmt)
{
stmt.Accept(this);
}
public StmtWhile(Expr _condition, Stmt _body)
{
condition = _condition;
body = _body;
}
public If(Expr condition, Stmt thenBranch, Stmt elseBranch)
{
this.condition = condition;
this.thenBranch = thenBranch;
this.elseBranch = elseBranch;
}
private Stmt ForStatement()
{
//forStmt → "for" "(" ( varDecl | exprStmt | ";" ) expression? ";" expression? ")" statement ;
if (!TryParse(LEFT_PAREN))
{
throw new ParserError(Current, "'(' expected after 'for'.");
}
//initializer is optional
Stmt initializer = null;
if (!TryParse(SEMICOLON)) //initializer skipped?
{
if (TryParse(VAR))
{
initializer = VarDeclaration();
}
else
{
initializer = ExpressionStatement();
}
}
//condition is optional
Expr condition = null;
if (!TryParse(SEMICOLON)) //condition skipped?
{
condition = Expression();
}
if (!TryParse(SEMICOLON))
{
throw new ParserError(Current, "';' expected after 'for' loop condition.");
}
//increment is also optional
Expr increment = null;
if (!TryParse(RIGHT_PAREN)) //increment skipped?
{
increment = Expression();
}
if (!TryParse(RIGHT_PAREN))
{
throw new ParserError(Current, "')' expected after 'for' clauses.");
}
//For is represented as Syntax-Tree build from primitives
//{
// var i = 0;
// while (i < 10)
// {
// print i;
// i = i + 1;
// }
//}
Stmt body = Statement();
//combine body and increment in the inner block
if (increment != null)
{
body = new Block(new List <Stmt>
{
body,
new ExpressionStatement(increment)
});
}
//wrap body in while loop with condition
if (condition != null)
{
body = new WhileStatement(condition, body);
}
//if there's an initializer combine it with body to form the outer block
if (initializer != null)
{
body = new Block(new List <Stmt>
{
initializer,
body
});
}
return(body);
}
void Resolve(Stmt stmt)
{
stmt.Accept(this);
}
public While(Expr condition, Stmt body)
{
this.condition = condition;
this.body = body;
}
public If(Expr Condition, Stmt ThenBranch, Stmt ElseBranch)
{
this.Condition = Condition;
this.ThenBranch = ThenBranch;
this.ElseBranch = ElseBranch;
}
public While(Expr Condition, Stmt Body)
{
this.Condition = Condition;
this.Body = Body;
}
public IfStatement(Expr condition, Stmt thenBranch, Stmt elseBranch)
{
Condition = condition;
ThenBranch = thenBranch;
ElseBranch = elseBranch;
}
public WhileStatement(Expr condition, Stmt body)
{
Condition = condition;
Body = body;
}
private void Resolve(Stmt statement)
{
statement.Accept(this);
}