protected override bool InternalMatch(ParserState p)
{
Trace.Assert(rules.Count == 1);
Rule r = rules[0];
if (!r.Match(p))
{
return(false);
}
while (true)
{
int old = p.index;
if (!r.Match(p))
{
return(true);
}
// Avoid infinite loops.
if (p.index <= old)
{
throw new Exception("Failed to advance parser input pointer, while parsing rule '" +
r.RuleNameOrDefinition + "'. This means the grammar is invalid, maybe because of nested star rules.");
}
}
}
public CppFileParser(IAstPrinter printer, string file)
{
Rule parse_rule = grammar.file;
string text = File.ReadAllText(file);
printer.Clear();
ParserState state = new ParserState(text);
try
{
if (!parse_rule.Match(state))
{
message = "Failed to parse file " + file;
}
else
{
if (state.AtEndOfInput())
{
message = "Successfully parsed file";
}
else
{
message = "Failed to read end of input";
}
}
}
catch (ParsingException e)
{
state.ForceCompletion();
message = e.Message;
}
printer.PrintNode(state.GetRoot(), 0);
}
protected override bool InternalMatch(ParserState p)
{
Rule r = rules[0];
r.Match(p);
return(true);
}
protected override bool InternalMatch(ParserState p)
{
Rule r = rules[0];
if (!r.Match(p))
{
ParsingException ex = new ParsingException(p.Peek(), r, p);
throw ex;
}
return(true);
}
protected override bool InternalMatch(ParserState p)
{
Trace.Assert(rules.Count == 1);
Rule r = rules[0];
if (r.Match(p))
{
return(false);
}
return(true);
}
protected override bool InternalMatch(ParserState p)
{
Rule r = func();
return(r.Match(p));
}