private DiagramItem Transform(ANTLRv4Parser.LexerAtomContext context)
{
if (context.terminal() != null)
{
return(new Terminal(context.terminal().TOKEN_REF()?.GetText() ?? context.terminal().STRING_LITERAL().GetText(), noneString, noneString));
}
if (context.LEXER_CHAR_SET() != null)
{
return(new Terminal(context.LEXER_CHAR_SET().GetText(), noneString, noneString));
}
if (context.notSet() != null)
{
return(new Sequence(new DiagramItem[] { TerminalWithClass("NOT", "nots"),
context.notSet().setElement() == null ? Transform(context.notSet().blockSet()) : Transform(context.notSet().setElement()) }
.Select(FSharpChoice <DiagramItem, string> .NewChoice1Of2)));
}
if (context.DOT() != null)
{
return(new Terminal("Anything", noneString, noneString));
}
if (context.characterRange() != null)
{
var startText = context.characterRange().STRING_LITERAL()[0].GetText().Split('\'')[1];
char start = startText.Length == 1 ? startText[0] :
(char)int.Parse(startText.Substring(2).TrimStart('0'), System.Globalization.NumberStyles.HexNumber);
var endText = context.characterRange().STRING_LITERAL()[1].GetText().Split('\'')[1];
char end = endText.Length == 1 ? endText[0] :
(char)int.Parse(endText.Substring(2).TrimStart('0'), System.Globalization.NumberStyles.HexNumber);
if (Math.Abs(start - end) <= 40)
{
return(new Choice(0, Enumerable.Range(start, end - start + 1)
.Select(x => new string((char)x, 1))
.Select(x => new Terminal(x, noneString, noneString))
.Select(FSharpChoice <DiagramItem, string> .NewChoice1Of2)) as DiagramItem);
}
return(new Terminal($"[{start}=\\u{(int)start} - {end}=\\u{(int)end}]", noneString, noneString));
}
throw new InvalidOperationException("WTF?!?!");
}
/// <summary>
/// Exit a parse tree produced by <see cref="ANTLRv4Parser.lexerAtom"/>.
/// <para>The default implementation does nothing.</para>
/// </summary>
/// <param name="context">The parse tree.</param>
public virtual void ExitLexerAtom([NotNull] ANTLRv4Parser.LexerAtomContext context)
{
}
/// <summary>
/// Visit a parse tree produced by <see cref="ANTLRv4Parser.lexerAtom"/>.
/// <para>
/// The default implementation returns the result of calling <see cref="AbstractParseTreeVisitor{Result}.VisitChildren(IRuleNode)"/>
/// on <paramref name="context"/>.
/// </para>
/// </summary>
/// <param name="context">The parse tree.</param>
/// <return>The visitor result.</return>
public virtual Result VisitLexerAtom([NotNull] ANTLRv4Parser.LexerAtomContext context)
{
return(VisitChildren(context));
}
