///Returning: 0-Not found, 1-Symbol, 2-Command, 3-Font, 4-Misc
static int FindPossibleEscape(string text, int pos, out int start, out int end)
{
start = 0;
end = 0;
pos--;
if (text.Length <= 0 || pos < 0 || pos >= text.Length)
{
return(0);
}
if (TexFormulaParser.IsParserReserved(text[pos]))
{
if (pos == 0 || text[pos - 1] != '\\')
{
if (pos == 0 || text[pos] != '\\')
{
return(0);
}
else if (pos < text.Length - 1)
{
pos++;
}
else
{
start = pos - 1;
end = pos;
return(4);
}
}
else
{
start = pos - 1;
end = pos;
return(4);
}
}
end = pos;
while (true)
{
if (char.IsLetter(text[pos]))
{
pos--;
if (pos >= 0)
{
continue;
}
else
{
return(0);
}
}
if (text[pos] == '\\')
{
if (pos == 0 || text[pos - 1] != '\\')
{
start = pos;
break;
}
}
return(0);
}
while (end < text.Length && char.IsLetter(text[end]))
{
end++;
}
end--;
var s = text.Substring(start + 1, end - start);
if (TEXPreference.main.GetFontIndexByID(s) >= 0)
{
return(3);
}
if (TexFormulaParser.isCommandRegistered(s))
{
return(2);
}
if (TEXPreference.main.GetChar(s) != null)
{
return(1);
}
return(4);
}
public override string ReplaceString(string original)
{
blocks.Clear();
int line = 0;
original = m_pattern.Replace(original, (match) =>
{
if (!match.Groups[5].Success && match.Length > 2)
{
// skip commands, fonts, big operators, delimiter
var g = match.Groups[1];
int s;
var m = TEXPreference.main;
if (!g.Success || TexFormulaParser.isCommandRegistered(g.Value) ||
m.GetFontIndexByID(g.Value) >= 0)
{
return(match.Value);
}
else if ((s = m.symbols.GetValue(g.Value)) > 0 &&
(m.GetChar(s).nextLargerExist || m.GetChar(s).extensionExist))
{
return(match.Value);
}
else if (match.Length > g.Length + 1)
{
// extra spaces can't be tolerated
// alternate to custom logic
return(Group2WithSpaceElimination(match, g));
}
}
var cmd = "\\vlink[" + blocks.Count + "]";
Block dyn = new Block()
{
index = blocks.Count,
start = match.Index,
length = match.Length,
// see text input cursor
lineSeparator = -1,
};
if (match.Value == "\n")
{
dyn.lineSeparator = line++;
blocks.Add(dyn);
return("\n" + cmd + "{}");
}
else if (match.Value == "\\")
{
blocks.Add(dyn);
return(cmd + "{\\\\}");
}
else if (match.Groups[4].Success)
{
dyn.start++;
dyn.length = 0;
blocks.Add(dyn);
return("{" + cmd + "{" + emptyPlaceholder + "}}");
}
else
{
blocks.Add(dyn);
return(cmd + "{" + match.Value + "}");
}
});
{
// keep things stable by capturing words
original = m_wrapholder.Replace(original, @"{$1}");
// sanitize invalid scripts
original = m_scriptEscape.Replace(original, @"{$1}$2");
}
return(original);
}