public List <Instruction> VisitWhile(object context, AstStatement.WhileStmt whileStmt)
{
/*
* while ( condition() ) { statement(); }
*
* #labelStart
* condition()
* not[]
* jumpIf #labelEnd
* statement()
* jump #labelStart
* #labelEnd
*/
var labelStart = this.GetNextLabel(whileStmt);
var labelEnd = this.GetNextLabel(whileStmt);
var list = new List <Instruction>();
list.Add(Label, new int[] { labelStart });
list.AddRange(whileStmt.Condition.Accept(whileStmt.Scope, this));
list.Add(Not);
list.Add(JumpIf, new int[] { labelEnd });
list.AddRange(whileStmt.Body.Accept(context, this));
list.Add(Jump, new int[] { labelStart });
list.Add(Label, new int[] { labelEnd });
return(list);
}
public void VisitWhile(IndentWriter context, AstStatement.WhileStmt whileStmt)
{
context.WriteLine("while(");
context.Indent();
this.PrintExpression(context, whileStmt.Condition, whileStmt.Scope);
context.Unindent();
context.WriteLine(") {");
context.Indent();
whileStmt.Body.Accept(context, this);
context.Unindent();
context.WriteLine("}");
}
public AstStatement VisitWhile(Scope context, AstStatement.WhileStmt whileStmt)
{
whileStmt.Condition = whileStmt.Condition.Accept(context, this);
whileStmt.Body = whileStmt.Body.Accept(context, this);
return(whileStmt);
}
public Tree VisitWhile(object c, AstStatement.WhileStmt whileStmt)
=> new Tree("while", Expr(whileStmt.Condition), whileStmt.Body.Accept(c, this));