public override bool? AcceptsLetter(ParseContext context, char letter) {
if (letter == '\r' || letter == '\n') return false; // don't allow multiline html
if (context.MatchedString.Length == 1 && context.MatchedString[0] != '<') return false;
if (context.MatchedString.Length == 2 && context.MatchedString[1] == ' ') return false;
if (context.MatchedString.Length > 2 && letter == '>')
{
var tag = Regex.Match(context.MatchedString, "</?([a-z0-9]+)[ />]",RegexOptions.IgnoreCase).Groups[1].Value;
// invalid opening tag
if (!validTags.ContainsKey(tag)) return false;
if (context.MatchedString.StartsWith("</")) return true; // for closing elements, end here
var csr = context.MatchedString;
if (!csr.EndsWith("/>")) csr = $"{csr}</{tag}>"; // close tag for xelement parsing
try
{
XElement.Parse(csr);
return true;
}
catch
{
return false;
}
}
return null;
}
public override bool? AcceptsLetter(ParseContext context, char letter) {
if (letter == '\n' || letter == '\r')
{
if (sb.ToString().Contains("\n")) return false; // allow only one \n in the same tag
return true;
}
return false;
}
public override bool? AcceptsLetter(ParseContext context, char letter) {
if (letter == '_')
{
if (context.PreviousTag?.Value is SpaceTag || context.PreviousTag?.Value is NewLineTag || context.NextChar == ' ' ||
context.NextChar == '\r' || context.NextChar == '\n')
{
var lastLit = (context.PreviousTag?.Value as LiteralTag);
if (lastLit?.Text.IsValidLink() == true) return false;
} else return false;
}
return base.AcceptsLetter(context, letter);
}
public override bool? AcceptsLetter(ParseContext context, char letter) {
if (context.MatchedString.Length > Match.Length)
{
if (letter == MatchTerminator)
{
if (ValidateArgs(context, ExtractArgs(context.MatchedString))) return true;
return false;
}
if (letter == '\n') return false;
} else if (Match[context.MatchedString.Length-1] != context.CurrentCharLowerCase) return false;
return null;
}
public override bool? AcceptsLetter(ParseContext context, char letter) {
if (letter == '=')
{
if (context.MatchedString.Length > 6) return false; // max is h6
if (context.NextChar != '=')
{
if (context.PreviousTag == null || context.PreviousTag.Value is SpaceTag || context.PreviousTag.Value is NewLineTag ||
context.NextChar == null || context.NextChar == ' ' || context.NextChar == '\r' || context.NextChar == '\n') return true;
return false;
}
return null;
} else return false;
}
public override bool? AcceptsLetter(ParseContext context, char letter) {
if (letter == ' ' || letter == '\t' || letter == '\r' || letter == '\n') return false;
return true;
}
/// <summary>
/// Parses terminal symbols - like string constants
/// </summary>
static void ParseTerminals(ParseContext context) {
for (var i = context.NonterminalStartPos; i <= context.Pos; i++)
{
var scanChar = context.Input[i];
var lastTerm = context.PreviousTag?.Value as TerminalTag;
if (lastTerm == null || lastTerm.AcceptsLetter(context, scanChar) == false)
{
foreach (var tt in terminalTags)
{
if (tt.AcceptsLetter(context, scanChar) != false)
{
context.AddTag(((TerminalTag)tt.Create()).AppendChar(scanChar));
break;
}
}
} else lastTerm.AppendChar(scanChar);
}
}
public abstract bool? AcceptsLetter(ParseContext context, char letter);
public override bool? AcceptsLetter(ParseContext context, char letter) {
if (Match[context.MatchedString.Length-1] != context.CurrentCharLowerCase) return false;
if (context.MatchedString.Length == Match.Length) return true;
return null;
}
protected override bool ValidateArgs(ParseContext context, string args) => true;
public override bool? AcceptsLetter(ParseContext context, char letter) {
if (letter == '\r' || letter == '\n') return false;
return base.AcceptsLetter(context, letter);
}
public override bool? AcceptsLetter(ParseContext context, char letter) {
var ret =base.AcceptsLetter(context, letter);
if (ret == true && !(context.NextChar ==null|| context.NextChar =='\r' || context.NextChar=='\n')) return false;
return ret;
}
protected abstract bool ValidateArgs(ParseContext context, string args);
protected override bool ValidateArgs(ParseContext context, string args) {
var parts = args.Split(' ');
if (string.IsNullOrEmpty(parts[0])) return false;
return parts[0].IsValidLink() || context.IsWikiKey(parts[0]);
}
protected override bool ValidateArgs(ParseContext context, string args)
{
return(args.Length > 0 && !args.Contains("'") && !args.Contains("\""));
}