//context should be init block if init exists
public static ForLoopNode Create(ContextNode context, CodeBlockNode init, ExpressionNode condition, CodeBlockNode increment, CodeBlockNode body, SequencePoint point)
{
if (init == null)
{
init = CodeBlockNode.Create(context, point);
}
if (condition == null)
{
condition = LiteralNode.Create(context, true, point);
}
if (increment == null)
{
increment = CodeBlockNode.Create(context, point);
}
if (!(condition.IsGettable && condition.ExpressionReturnType.IsAssignableTo(context.Parser.Bool)))
{
ErrorCode.InvalidCondition.ReportAndThrow(point, "Condition must be a gettable boolean expression");
}
return(new ForLoopNode(init, condition, increment, body, point));
}
public static ParserNode Parse(ContextNode context, IAbstractSyntaxTree lexerNode)
{
Contract.Requires(context != null);
CodeBlockNode init = null;
ExpressionNode condition = null;
CodeBlockNode increment = null;
IAbstractSyntaxTree initNode = lexerNode.Children[2];
IAbstractSyntaxTree conditionNode = lexerNode.Children[4];
IAbstractSyntaxTree incrementNode = lexerNode.Children[6];
IAbstractSyntaxTree bodyNode = lexerNode.Children[8];
if (initNode.Type != TokenType.Empty)
{
init = CodeBlockNode.Create(context, context.Parser.GetSequencePoint(initNode));
init.AddStatement(initNode);
//makes init scope encompass for scope
context = init;
}
if (conditionNode.Type != TokenType.Empty)
{
condition = ExpressionNode.Parse(context, conditionNode, context.Parser.Bool);
}
if (incrementNode.Type != TokenType.Empty)
{
increment = CodeBlockNode.Create(context, context.Parser.GetSequencePoint(incrementNode));
increment.AddStatement(incrementNode);
}
var body = CodeBlockNode.Parse(context, bodyNode);
return(ForLoopNode.Create(context, init, condition, increment, body, context.Parser.GetSequencePoint(lexerNode)));
}