private static INfa Character(RegexCharacterClassCharacter character, bool negate)
{
var start = new NfaState();
var end = new NfaState();
ITerminal terminal = new CharacterTerminal(character.Value);
if (negate)
terminal = new NegationTerminal(terminal);
var transition = new TerminalNfaTransition(
terminal: terminal,
target: end);
start.AddTransistion(transition);
return new Nfa(start, end);
}
private static BaseLexerRule CreateNotSingleQuoteLexerRule()
{
var start = new DfaState();
var final = new DfaState(true);
var terminal = new NegationTerminal(new CharacterTerminal('\''));
var edge = new DfaTransition(terminal, final);
start.AddTransition(edge);
final.AddTransition(edge);
return new DfaLexerRule(start, new TokenType(@"([^']|(\\.))+"));
}
private static BaseLexerRule CreateNotDoubleQuoteLexerRule()
{
// ([^"]|(\\.))*
var start = new DfaState();
var escape = new DfaState();
var final = new DfaState(true);
var notDoubleQuoteTerminal = new NegationTerminal(
new CharacterTerminal('"'));
var escapeTerminal = new CharacterTerminal('\\');
var anyTerminal = new AnyTerminal();
var notDoubleQuoteEdge = new DfaTransition(notDoubleQuoteTerminal, final);
start.AddTransition(notDoubleQuoteEdge);
final.AddTransition(notDoubleQuoteEdge);
var escapeEdge = new DfaTransition(escapeTerminal, escape);
start.AddTransition(escapeEdge);
final.AddTransition(escapeEdge);
var anyEdge = new DfaTransition(anyTerminal, final);
escape.AddTransition(anyEdge);
return new DfaLexerRule(start, new TokenType(@"([^""]|(\\.))+"));
}
private static BaseLexerRule CreateMultiLineCommentLexerRule()
{
var pattern = @"\/[*]([*][^\/]|[^*])*[*][\/]";
var states = new DfaState[5];
for (int i = 0; i < states.Length; i++)
states[i] = new DfaState();
var slash = new CharacterTerminal('/');
var star = new CharacterTerminal('*');
var notStar = new NegationTerminal(star);
var notSlash = new NegationTerminal(slash);
var firstSlash = new DfaTransition(slash, states[1]);
var firstStar = new DfaTransition(star, states[2]);
var repeatNotStar = new DfaTransition(notStar, states[2]);
var lastStar = new DfaTransition(star, states[3]);
var goBackNotSlash = new DfaTransition(notSlash, states[2]);
var lastSlash = new DfaTransition(slash, states[4]);
states[0].AddTransition(firstSlash);
states[1].AddTransition(firstStar);
states[2].AddTransition(repeatNotStar);
states[2].AddTransition(lastStar);
states[3].AddTransition(goBackNotSlash);
states[3].AddTransition(lastSlash);
return new DfaLexerRule(states[0], pattern);
}
private static ILexerRule CreateNotSingleQuoteLexerRule()
{
var start = new DfaState();
var final = new DfaState(true);
var terminal = new NegationTerminal(new Terminal('\''));
var edge = new DfaEdge(terminal, final);
start.AddEdge(edge);
final.AddEdge(edge);
return new DfaLexerRule(start, new TokenType("not-single-quote"));
}
private static ILexerRule CreateNotDoubleQuoteLexerRule()
{
// ( [^"\\] | (\\ .) ) +
var start = new DfaState();
var escape = new DfaState();
var final = new DfaState(true);
var notQuoteTerminal = new NegationTerminal(
new SetTerminal('"', '\\'));
var escapeTerminal = new Terminal('\\');
var anyTerminal = new AnyTerminal();
var notQuoteEdge = new DfaEdge(notQuoteTerminal, final);
start.AddEdge(notQuoteEdge);
final.AddEdge(notQuoteEdge);
var escapeEdge = new DfaEdge(escapeTerminal, escape);
start.AddEdge(escapeEdge);
final.AddEdge(escapeEdge);
var anyEdge = new DfaEdge(anyTerminal, final);
escape.AddEdge(anyEdge);
return new DfaLexerRule(start, new TokenType("not-double-quote"));
}
private static INfa Range(RegexCharacterRange range, bool negate)
{
// combine characters into a character range terminal
var start = range.StartCharacter.Value;
var end = range.EndCharacter.Value;
ITerminal terminal = new RangeTerminal(start, end);
var nfaStartState = new NfaState();
var nfaEndState = new NfaState();
if (negate)
terminal = new NegationTerminal(terminal);
nfaStartState.AddTransistion(
new TerminalNfaTransition(terminal, nfaEndState));
return new Nfa(nfaStartState, nfaEndState);
}
