public ParseResult Parse(Lexer lexer, ParserState initialState)
{
var context = new ParserContext(this, Automaton.Grammar, lexer);
context.CurrentState = initialState;
context.ParserStack.Push(new ParserNode(context, new GrammarDefinition("init"))
{
State = initialState
});
ReadNextToken(context);
context.CurrentNode = new ParserNode(context, Automaton.Grammar.ToElement(lexer.Current.GetTokenCode()), lexer.Current);
while (lexer.Current != null && context.Root == null && context.CurrentState != null)
{
// If no input and no default action (e.g. a grammar reduction),
// that means we have to read the next token.
if (context.CurrentNode == null && context.CurrentState.DefaultAction == null)
ReadNextToken(context);
var action = GetNextAction(context);
action.Execute(context);
}
lexer.SpecialBag.InsertNodesIntoAstNode(context.Root.Result);
return ParseResult.FromContext(context);
}
public AstTokenStream(Lexer lexer)
{
if (lexer == null)
throw new ArgumentNullException(nameof(lexer));
Lexer = lexer;
Advance();
}
public ParserContext(AutomatonSourceParser parser, Grammar grammar, Lexer lexer)
{
Parser = parser;
Grammar = grammar;
Lexer = lexer;
ParserStack = new Stack<ParserNode>();
SyntaxErrors = new List<SyntaxError>();
}
public ParseResult Parse(Lexer lexer, GrammarDefinition rootDefinition)
{
return Parse(lexer, Automaton.InitialStates[rootDefinition]);
}
public override ParseResult Parse(Lexer lexer)
{
return Parse(lexer, Automaton.DefaultInitialState);
}
public abstract ParseResult Parse(Lexer lexer);
