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 While(Expr condition, Stmt body)
{
Condition = condition;
Body = body;
}
private void Execute(Stmt stmt)
{
stmt.Accept(this);
}
private Stmt ForStatement()
{
Expect(TokenType.LeftParen, ErrorType.ExpectedOpenParen);
Stmt initializer;
if (CheckCurrentToken(TokenType.Semicolon))
{
initializer = null;
Advance();
}
else if (CheckCurrentToken(TokenType.Var))
{
Advance();
initializer = VarDeclaration();
}
else
{
initializer = ExpressionStatement();
}
Expr condition = null;
if (!CheckCurrentToken(TokenType.Semicolon))
{
condition = Expression();
}
Expect(TokenType.Semicolon, ErrorType.ExpectedSemicolon);
Expr increment = null;
if (!CheckCurrentToken(TokenType.RightParen))
{
increment = Expression();
}
Expect(TokenType.RightParen, ErrorType.ExpectedClosedParen);
Stmt body = Statement();
if (increment != null)
{
body = new BlockStmt(new List <Stmt> {
body, new ExpressionStmt(increment)
});
}
if (condition == null)
{
condition = new LiteralExpr(true);
}
body = new WhileStmt(condition, body);
if (initializer != null)
{
body = new BlockStmt(new List <Stmt> {
initializer, body
});
}
return(body);
}
public If(Expr condition, Stmt thenBranch, Stmt elseBranch)
{
Condition = condition;
ThenBranch = thenBranch;
ElseBranch = elseBranch;
}
private Stmt ForStatement()
{
Consume(LEFT_PAREN, "Expect '(' after 'for'.");
Stmt initializer;
if (Match(SEMICOLON))
{
initializer = null;
}
else if (Match(VAR))
{
initializer = VarDeclaration();
}
else
{
initializer = ExpressionStatement();
}
Expr condition = null;
if (!Check(SEMICOLON))
{
condition = Expression();
}
Consume(SEMICOLON, "Expect ';' after loop condition");
Expr increment = null;
if (!Check(SEMICOLON))
{
increment = Expression();
}
Consume(RIGHT_PAREN, "Expect ';' after for clauses");
Stmt body = Statement();
if (increment != null)
{
body = new Stmt.Block(new List <Stmt>()
{
body,
new Stmt.Expression(increment)
});
}
if (condition == null)
{
condition = new Expr.Literal(true);
}
body = new Stmt.While(condition, body);
if (initializer != null)
{
body = new Stmt.Block(new List <Stmt>()
{
initializer, body
});
}
return(body);
}
void Resolve(Stmt stmt)
{
stmt.Accept(this);
}
public IfStmt(Expr condition, Stmt thenBranch, Stmt elseBranch)
{
this.condition = condition;
this.thenBranch = thenBranch;
this.elseBranch = elseBranch;
}
public WhileStmt(Expr condition, Stmt body)
{
this.condition = condition;
this.body = body;
}
public String Print(Stmt stmt)
{
return(stmt.Accept(this));
}