public void RhSide(Production p)
{
CSymbol s;
ParserOldAction a = null; // last old action seen
while (m_tok!=null)
{
if (m_tok.Matches(";"))
break;
if (m_tok.Matches("|"))
break;
if (m_tok.Matches(":"))
{
Advance();
p.m_alias[m_tok.yytext] = p.m_rhs.Count;
Advance();
}
else if (m_tok is PrecReference)
{
if (p.m_rhs.Count==0)
erh.Error(new CSToolsException(21,"%prec cannot be at the start of a right hand side"));
PrecReference pr = (PrecReference)m_tok;
CSymbol r = (CSymbol)p.m_rhs[p.m_rhs.Count-1];
r.m_prec = pr.precref.m_prec;
Advance();
}
else
{
s = (CSymbol)m_tok;
if (s.m_symtype==CSymbol.SymType.oldaction)
{
if (a!=null)
Error(42,s.pos,"adjacent actions");
a = (ParserOldAction)s;
if (a.m_action<0)
{ // an OldAction that has been converted to a SimpleAction: discard it
s = a.m_sym; // add the SimpleAction instead
s.m_symtype = CSymbol.SymType.simpleaction;
ParserSimpleAction sa = (ParserSimpleAction)s;
}
else // add it to the Actions function
m_actions += String.Format("\ncase {0} : {1} break;", a.m_action, a.m_initialisation);
a = null;
}
else if (s.m_symtype!=CSymbol.SymType.simpleaction)
s = ((CSymbol)m_tok).Resolve();
p.AddToRhs(s);
Advance();
}
}
Precedence.Check(p);
}
void _Create()
{
ptokens tks = new ptokens(erh);
m_outname = "syntax";
tks.m_sgen = this;
m_lexer = tks;
m_symbols.erh = erh;
m_symbols.ClassInit(this);
m_outname = "syntax";
m_outFile.WriteLine("using System;using Tools;");
Production special = new Production(this,m_symbols.Special);
m_lexer.yytext = "error";
CSymbol e = (new CSymbol(this)).Resolve();
e.m_symtype = CSymbol.SymType.nonterminal;
e.m_defined=true;
// 1: INPUT
// top-down parsing of script
m_lexer.Start(m_inFile);
m_tok = (TOKEN)m_lexer.Next();
//Console.WriteLine("Token <{0}> {1}",m_tok.yytext,m_tok.GetType().Name);
while (m_tok!=null)
ParseProduction();
// that's the end of the script
if (!m_parserseen)
Error(30,0,"no parser directive detected - possibly incorrect text encoding?");
m_outFile.WriteLine(m_actions); // output the action function
m_outFile.WriteLine("} return null; }");
special.AddToRhs(m_symbols.m_startSymbol);
special.AddToRhs(m_symbols.EOFSymbol);
// 2: PROCESSING
Console.WriteLine("First");
DoFirst();
Console.WriteLine("Follow");
DoFollow();
Console.WriteLine("Parse Table");
ParseState start = new ParseState(this,null);
m_symbols.m_states[0] = start;
start.MaybeAdd(new ProdItem(special,0));
start.Closure();
start.AddEntries();
Transition tfinal = (Transition)start.m_transitions[m_symbols.m_startSymbol.yytext];
ParserShift pe = tfinal.m_next;
m_symbols.m_accept = pe.m_next;
if (m_symbols.m_accept==null)
m_symbols.erh.Error(new CSToolsFatalException(43,0,0,"","No accept state. ParserGenerator cannot continue."));
// 2A: Reduce States for the LR(0) parser
foreach (ParseState ps in m_symbols.m_states.Values)
ps.ReduceStates();
/* if (m_showParser)
{
foreach (ParseState ps in m_symbols.m_states.Values)
{
ps.Print0();
if (ps==m_symbols.m_accept)
Console.WriteLine(" EOF accept");
}
} */
// 3: Compute Look-ahead sets
if (m_lalrParser)
{
m_symbols.Transitions(new Builder(Transition.BuildDR));
/* if (m_showParser)
m_symbols.PrintTransitions(new Func(Transition.DR),"DR"); */
m_symbols.Transitions(new Builder(Transition.BuildReads));
new Digraph(this,
new Relation(Transition.reads),
new Func(Transition.DR),
new Func(Transition.Read),
new AddToFunc(Transition.AddToRead)).Compute();
// detect cycles in Read TBD
/* if (m_showParser)
m_symbols.PrintTransitions(new Func(Transition.Read),"Read"); */
m_symbols.Transitions(new Builder(Transition.BuildIncludes));
m_symbols.Transitions(new Builder(Transition.BuildLookback));
new Digraph(this,
new Relation(Transition.includes),
new Func(Transition.Read),
new Func(Transition.Follow),
new AddToFunc(Transition.AddToFollow)).Compute();
// detect cycles for which Read is non empty TBD
/* if (m_showParser)
m_symbols.PrintTransitions(new Func(Transition.Follow),"Follow"); */
m_symbols.Transitions(new Builder(Transition.BuildLA));
}
// 5: OUTPUT
// output the run-time ParsingInfo table
Console.WriteLine("Building parse table");
m_symbols.Transitions(new Builder(Transition.BuildParseTable));
foreach (CSymbol v in m_symbols.symbols.Values)
{
if (v.m_symtype!=CSymbol.SymType.nodesymbol)
continue;
ParsingInfo pi = new ParsingInfo(v.yytext);
CSymbol r = v;
while (r.m_symtype==CSymbol.SymType.nodesymbol)
r = r.m_refSymbol;
if (m_symbols.symbolInfo[v.yytext]!=null)
m_symbols.erh.Error(new CSToolsException(45,"Bad %node/%symbol hierarchy"));
pi.m_parsetable = m_symbols.GetSymbolInfo(r.yytext).m_parsetable;
m_symbols.symbolInfo[v.yytext] = pi;
}
Console.WriteLine("Writing the output file");
m_outFile.WriteLine(@"/// <summary/>");
m_outFile.WriteLine("public yy"+m_outname+"():base() { arr = new int[] { ");
m_symbols.Emit(m_outFile);
// output the class factories
CSymbol s;
Console.WriteLine("Class factories");
IDictionaryEnumerator de = m_symbols.symbols.GetEnumerator();
for (int pos = 0; pos<m_symbols.symbols.Count; pos++)
{
de.MoveNext();
string str = (string)de.Key;
s = (CSymbol)de.Value;
if ((s==null) // might happen because of error recovery
|| (s.m_symtype!=CSymbol.SymType.nonterminal && s.m_symtype!=CSymbol.SymType.nodesymbol))
continue;
//Console.WriteLine("{0} {1}",s.yytext,s.m_symtype);
m_outFile.WriteLine("new Sfactory(this,\"{0}\",new SCreator({0}_factory));",str);
}
m_outFile.WriteLine("}");
de.Reset();
for (int pos = 0; pos<m_symbols.symbols.Count; pos++)
{
de.MoveNext();
string str = (string)de.Key;
s = (CSymbol)de.Value;
if ((s==null) // might happen because of error recovery
|| (s.m_symtype!=CSymbol.SymType.nonterminal && s.m_symtype!=CSymbol.SymType.nodesymbol))
continue;
//Console.WriteLine("{0} {1}",s.yytext,s.m_symtype);
m_outFile.WriteLine(@"/// <summary/>");
m_outFile.WriteLine("public static object "+str+"_factory(Parser yyp) { return new "+str+"(yyp); }");
}
m_outFile.WriteLine("}");
m_outFile.WriteLine(@"/// <summary/>");
m_outFile.WriteLine("public class "+m_outname+": Parser {");
m_outFile.WriteLine(@"/// <summary/>");
m_outFile.WriteLine("public "+m_outname+"():base(new yy"+m_outname+"(),new "+m_lexerClass+"()) {}");
m_outFile.WriteLine(@"/// <summary/>");
m_outFile.WriteLine("public "+m_outname+"(Symbols syms):base(syms,new "+m_lexerClass+"()) {}");
m_outFile.WriteLine(@"/// <summary/>");
m_outFile.WriteLine("public "+m_outname+"(Symbols syms,ErrorHandler erh):base(syms,new "+m_lexerClass+"(erh)) {}");
m_outFile.WriteLine(m_actvars);
m_outFile.WriteLine(" }");
if (m_namespace)
m_outFile.WriteLine("}");
Console.WriteLine("Done");
if (m_showParser)
{
foreach (ParseState ps in m_symbols.m_states.Values)
{
ps.Print();
if (ps==m_symbols.m_accept)
Console.WriteLine(" EOF accept");
}
}
}
