public override void Execute(ParserContext context)
{
context.SendLogMessage(MessageSeverity.Message, ToString());
CustomAction?.Invoke(context);
context.ParserStack.Push(context.CurrentNode);
context.CurrentState = context.CurrentNode.State = NextState;
context.CurrentNode = null;
}
public override void Execute(ParserContext context)
{
context.SendLogMessage(MessageSeverity.Message, ToString());
context.Root = context.ParserStack.Pop();
context.CurrentNode = null;
context.CurrentState = context.ParserStack.Peek().State;
}
public override void Execute(ParserContext context)
{
ReportSyntaxError(context);
if (!TryRecover(context))
{
context.SendLogMessage(MessageSeverity.Error, "Failed to recover from syntax error.");
context.CurrentState = null;
}
}
private static void ReportSyntaxError(ParserContext context)
{
var expectedTokens = context.CurrentState.Actions.Keys.OfType<TokenGrammarElement>().ToArray();
var node = context.CurrentNode;
var message = string.Format("Unexpected {0} token. Expected {1}.",
node.GrammarElement.Name,
string.Join(" or ", expectedTokens.Select(x => x.Name)));
context.SyntaxErrors.Add(new SyntaxError(node.Result.Range.Start, message, MessageSeverity.Error));
context.SendLogMessage(MessageSeverity.Error, message);
}
public override void Execute(ParserContext context)
{
context.SendLogMessage(MessageSeverity.Message, ToString());
var temp = context.CurrentNode;
var node = context.CurrentNode = CreateNode(context);
context.CurrentState = context.ParserStack.Peek().State;
var action = context.CurrentState.Actions[node.GrammarElement];
action.Execute(context);
context.CurrentNode = temp;
}
private static ShiftParserAction PopToErrorShifter(ParserContext context)
{
ParserAction action = null;
while (context.ParserStack.Any())
{
var state = context.ParserStack.Peek().State;
context.SendLogMessage(MessageSeverity.Message, "Going back to state " + state.Id + ".");
state.Actions.TryGetValue(Grammar.Error, out action);
if (action is ShiftParserAction)
break;
context.ParserStack.Pop();
}
return action as ShiftParserAction;
}
public void ReadNextToken(ParserContext context)
{
context.SendLogMessage(MessageSeverity.Message, "Read next token.");
var lexer = context.Lexer;
lexer.Advance();
context.CurrentNode = new ParserNode(context, Automaton.Grammar.ToElement(lexer.Current.GetTokenCode()), lexer.Current);
}