public CodeBlockNode AddNode(IAbstractSyntaxTree lexerNode)
{
switch (lexerNode.Type)
{
case Lexer.TokenType.WhileLoop:
return(AddNode(WhileBlock.Parse(this, lexerNode)));
case Lexer.TokenType.ConditionalSentence:
return(AddNode(ConditionBlockNode.Parse(this, lexerNode)));
case Lexer.TokenType.CodeBlockNode:
return(AddNode(CodeBlockNode.Parse(this, lexerNode)));
case Lexer.TokenType.ForLoop:
return(AddNode(ForLoopNode.Parse(this, lexerNode)));
case Lexer.TokenType.ForEachLoop:
return(AddNode(ForEachNode.Parse(this, lexerNode)));
case Lexer.TokenType.StatementWithEndOfLine:
if (lexerNode.Children.Count == 2)
{
return(AddStatement(lexerNode.Children[0]));
}
else
{
//empty statement a.k.a ";"
return(this);
}
case Lexer.TokenType.UnknownNode:
ErrorCode.InvalidStructure.ReportAndThrow(Parser.GetSequencePoint(lexerNode), "Could not parse as a statement");
return(null); //unreachable
default:
ErrorCode.InvalidStructure.ReportAndThrow(Parser.GetSequencePoint(lexerNode), "Unexpected node {0} in while parsing code block", lexerNode.Type);
return(null); //unreachable
}
}
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)));
}
