public bool SyntaxError(lr_parser parser, Symbol curToken)
{
TypeCobolProgramParser tcpParser = parser as TypeCobolProgramParser;
if (tcpParser.IsTrial)
{
return(true);
}
List <string> expected = ExpectedSymbols(parser, curToken);
string symName = CodeElementTokenizer.CupTokenToString(curToken.sym);
Symbol validSymbol = GetParserValidStackSymbol(parser, curToken);
string text = validSymbol != null ? (validSymbol.value as CodeElement).Text : "";
string msg = string.Format("extraneous input '{0}' expecting {{{1}}}", text, string.Join(", ", expected));
System.Diagnostics.Debug.WriteLine(msg);
CupParserDiagnostic diagnostic = new CupParserDiagnostic(msg, validSymbol, null);
AddDiagnostic(diagnostic);
//Try to add the last encountered statement in the stack if it is not already entered.
StackList <Symbol> stack = tcpParser.getParserStack();
foreach (var symbol in stack)
{
if (symbol.value is StatementElement)
{
lr_parser stmtParser = CloneParser(parser, TypeCobolProgramSymbols.StatementEntryPoint,
symbol.value as CodeElement, true);
stmtParser.parse();
break;
}
}
return(true);
}
/// <summary>
/// Get the array of expected symbols on the given symbol current parser state.
/// </summary>
/// <param name="parser">The parser</param>
/// <param name="curToken">The Symbol</param>
/// <returns>The array of expected symbols</returns>
private static List <string> ExpectedSymbols(lr_parser parser, Symbol curToken)
{
var actionTab = parser.action_table();
int state = ((TypeCobolProgramParser)parser).getParserState();
short[] row = actionTab[state];
List <string> expected = new List <string>();
for (int probe = 0; probe < row.Length; probe++)
{
int tag = row[probe++];
if (tag != -1 && tag != parser.error_sym())
{//symbol tag different of the default symbol.
string name = CodeElementTokenizer.CupTokenToString(tag);
if (name != null)
{
expected.Add(name);
}
}
}
return(expected);
}