// parsing routines
internal void ParseProduction()
{
TOKEN tok = m_tok;
CSymbol lhs = null;
try
{
lhs = ((CSymbol)m_tok).Resolve();
}
catch(Exception e)
{
erh.Error(new CSToolsFatalException(45,tok,string.Format("Syntax error in Parser script - possibly extra semicolon?",e.Message)));
}
m_tok = lhs;
if (m_tok.IsTerminal())
Error(39,m_tok.pos,string.Format("Illegal left hand side <{0}> for production",m_tok.yytext));
if (m_symbols.m_startSymbol==null)
m_symbols.m_startSymbol = lhs;
if (lhs.m_symtype==CSymbol.SymType.unknown)
lhs.m_symtype = CSymbol.SymType.nonterminal;
if ((!lhs.m_defined) && lhs.m_prods.Count==0)
{ // lhs not defined in %symbol statement and not previously a lhs
// so declare it as a new symbol
m_outFile.WriteLine(@"/// <summary/>");
m_outFile.WriteLine("public class "+lhs.yytext+" : SYMBOL {");
m_outFile.WriteLine(@"/// <summary/>");
m_outFile.WriteLine(@"/// <param name='yyq'></param>");
m_outFile.WriteLine(" public "+lhs.yytext+"(Parser yyq):base(yyq) { }");
m_outFile.WriteLine(@"/// <summary/>");
m_outFile.WriteLine(" public override string yyname() { return \""+lhs.yytext+"\"; }}");
}
if (!Find(lhs))
new SymbolType(this,lhs.yytext);
m_prod = new Production(this,lhs);
m_lexer.yy_begin("rhs");
Advance();
if (!m_tok.Matches(":"))
Error(40,m_tok.pos,String.Format("Colon expected for production {0}",lhs.yytext));
Advance();
RhSide(m_prod);
while(m_tok!=null && m_tok.Matches("|"))
{
Advance();
m_prod = new Production(this,lhs);
RhSide(m_prod);
}
if (m_tok==null || !m_tok.Matches(";"))
Error(41,m_lexer.m_pch,"Semicolon expected");
Advance();
m_prod = null;
m_lexer.yy_begin("YYINITIAL");
}
