public GoldGrammar()
: base("gold")
{
Parser oldSeparator = DefaultSeparator;
// Special Terminals
ExceptParser parameterCh = Terminals.Printable - Terminals.Set("\"'");
AlternativeParser nonterminalCh = Terminals.LetterOrDigit | Terminals.Set("_-. ");
AlternativeParser terminalCh = Terminals.LetterOrDigit | Terminals.Set("_-.");
ExceptParser literalCh = Terminals.Printable - Terminals.Set('\'');
ExceptParser setLiteralCh = Terminals.Printable - Terminals.Set("[]'");
ExceptParser setNameCh = Terminals.Printable - Terminals.Set("{}");
SequenceParser parameterName = ('"' & (+parameterCh).WithName("value") & '"').Separate();
SequenceParser nonterminal = ('<' & (+nonterminalCh).WithName("value") & '>').Separate();
AlternativeParser terminal =
((+terminalCh).WithName("terminal") | ('\'' & (-literalCh).WithName("literal") & '\'')).Separate();
SequenceParser setLiteral =
('[' & +(setLiteralCh.WithName("ch") | '\'' & (-literalCh).WithName("ch") & '\'') & ']').WithName(
"setLiteral");
SequenceParser setName = ('{' & (+setNameCh).WithName("value") & '}').WithName("setName");
// Line-Based Grammar Declarations
var comments = new GroupParser("!*", "*!", "!");
Parser newline = Terminals.Eol;
whitespace = -(Terminals.SingleLineWhiteSpace | comments);
DefaultSeparator = whitespace;
RepeatParser nlOpt = -newline;
AlternativeParser nl = +newline | Terminals.End;
// Parameter Definition
AlternativeParser parameterItem = parameterName | terminal | setLiteral | setName | nonterminal;
RepeatParser parameterItems = +parameterItem;
SequenceParser parameterBody = parameterItems & -(nlOpt & '|' & parameterItems);
parameter =
(parameterName.Named("name") & nlOpt & '=' & parameterBody.WithName("body") & nl).WithName("parameter");
// Set Definition
AlternativeParser setItem = setLiteral | setName;
var setExp = new AlternativeParser {
Name = "setExp"
};
setExp.Add((setExp & nlOpt & '+' & setItem).WithName("add"),
(setExp & nlOpt & '-' & setItem).WithName("sub"),
setItem);
setDecl = (setName & nlOpt & '=' & setExp & nl).WithName("setDecl");
// Terminal Definition
var regExp2 = new SequenceParser();
OptionalParser kleeneOpt = (~((Parser)'+' | '?' | '*')).WithName("kleene");
regExpItem = ((setLiteral & kleeneOpt)
| (setName & kleeneOpt)
| (terminal.Named("terminal") & kleeneOpt)
| ('(' & regExp2.Named("regExp2") & ')' & kleeneOpt)).WithName("regExpItem");
RepeatParser regExpSeq = (+regExpItem).WithName("regExpSeq");
regExp2.Items.Add(regExpSeq);
regExp2.Items.Add(-('|' & regExpSeq));
regExp = (regExpSeq & -(nlOpt & '|' & regExpSeq)).WithName("regExp");
RepeatParser terminalName = +terminal;
terminalDecl = (terminalName.Named("name") & nlOpt & '=' & regExp & nl).WithName("terminalDecl");
// Rule Definition
symbol = (terminal.Named("terminal") | nonterminal.Named("nonterminal")).WithName("symbol");
handle = (-symbol).WithName("handle");
SequenceParser handles = handle & -(nlOpt & '|' & handle);
ruleDecl = (nonterminal.Named("name") & nlOpt & "::=" & handles & nl).WithName("ruleDecl");
// Rules
AlternativeParser definitionDecl = parameter | setDecl | terminalDecl | ruleDecl;
RepeatParser content = -definitionDecl;
Inner = nlOpt & content & nlOpt;
DefaultSeparator = oldSeparator;
AttachEvents();
}
