private static Nfa rule()
{
int num = 0;
NfaPair nfaPair = Alloc.NewNfaPair();
Nfa nfa;
Nfa end;
if (MakeNfa.spec.current_token == Tokens.AT_BOL)
{
num |= 1;
MakeNfa.gen.Advance();
MakeNfa.expr(nfaPair);
nfa = Alloc.NewNfa(MakeNfa.spec);
nfa.Edge = MakeNfa.spec.BOL;
nfa.Next = nfaPair.start;
end = nfaPair.end;
}
else
{
MakeNfa.expr(nfaPair);
nfa = nfaPair.start;
end = nfaPair.end;
}
if (Tokens.AT_EOL == MakeNfa.spec.current_token)
{
MakeNfa.gen.Advance();
NfaPair nfaPair2 = Alloc.NewNLPair(MakeNfa.spec);
end.Next = Alloc.NewNfa(MakeNfa.spec);
Nfa next = end.Next;
next.Next = nfaPair2.start;
next.Sibling = Alloc.NewNfa(MakeNfa.spec);
next.Sibling.Edge = MakeNfa.spec.EOF;
next.Sibling.Next = nfaPair2.end;
end = nfaPair2.end;
num |= 2;
}
if (end == null)
{
Error.ParseError(Errors.ZERO, MakeNfa.gen.InputFilePath, MakeNfa.input.line_number);
}
end.SetAccept(MakeNfa.gen.packAccept());
end.SetAnchor(num);
return(nfa);
}
private static void term(NfaPair pair)
{
if (Tokens.OPEN_PAREN == MakeNfa.spec.current_token)
{
MakeNfa.gen.Advance();
MakeNfa.expr(pair);
if (Tokens.CLOSE_PAREN == MakeNfa.spec.current_token)
{
MakeNfa.gen.Advance();
return;
}
Error.ParseError(Errors.SYNTAX, MakeNfa.gen.InputFilePath, MakeNfa.input.line_number);
return;
}
else
{
Nfa nfa = Alloc.NewNfa(MakeNfa.spec);
pair.start = nfa;
nfa.Next = Alloc.NewNfa(MakeNfa.spec);
pair.end = nfa.Next;
bool flag = MakeNfa.spec.current_token == Tokens.LETTER && char.IsLetter(MakeNfa.spec.current_token_value);
if (MakeNfa.spec.current_token != Tokens.ANY && MakeNfa.spec.current_token != Tokens.CCL_START && (!MakeNfa.spec.IgnoreCase || !flag))
{
nfa.Edge = MakeNfa.spec.current_token_value;
MakeNfa.gen.Advance();
return;
}
nfa.Edge = '';
nfa.SetCharSet(new CharSet());
CharSet charSet = nfa.GetCharSet();
if (MakeNfa.spec.IgnoreCase && flag)
{
charSet.addncase(MakeNfa.spec.current_token_value);
}
else
{
if (MakeNfa.spec.current_token == Tokens.ANY)
{
charSet.add(10);
charSet.add(13);
charSet.add((int)MakeNfa.spec.BOL);
charSet.add((int)MakeNfa.spec.EOF);
charSet.complement();
}
else
{
MakeNfa.gen.Advance();
if (MakeNfa.spec.current_token == Tokens.CHAR_CLASS)
{
MakeNfa.gen.Advance();
if (!charSet.AddClass(MakeNfa.spec.class_name.ToLower()))
{
Error.ParseError(Errors.InvalidCharClass, MakeNfa.gen.InputFilePath, MakeNfa.input.line_number);
}
}
else
{
if (MakeNfa.spec.current_token == Tokens.AT_BOL)
{
MakeNfa.gen.Advance();
charSet.add((int)MakeNfa.spec.BOL);
charSet.add((int)MakeNfa.spec.EOF);
charSet.complement();
}
}
if (MakeNfa.spec.current_token != Tokens.CCL_END)
{
MakeNfa.dodash(charSet);
}
}
}
MakeNfa.gen.Advance();
return;
}
}