public AccentedAtom(Atom baseAtom, string accentName)
{
BaseAtom = baseAtom;
AccentAtom = SymbolAtom.GetAtom(accentName);
if (AccentAtom.Type != TexAtomType.Accent)
{
throw new ArgumentException(@"The specified symbol name is not an accent.", nameof(accentName));
}
}
private Atom ConvertCharacter(TexFormula formula, string value, ref int position, char character)
{
position++;
if (IsSymbol(character))
{
// Character is symbol.
var symbolName = symbols[character];
if (symbolName is null)
{
throw new TexParseException($"Unknown character : '{character}'");
}
try
{
return(SymbolAtom.GetAtom(symbolName));
} catch (SymbolNotFoundException e)
{
throw new TexParseException(
$"The character '{character}' was mapped to an unknown symbol with the name '{symbolName}'!", e);
}
}
// Character is alpha-numeric.
return(new CharAtom(character, formula.TextStyle));
}
internal static SymbolAtom GetDelimiterSymbol(string name)
{
var result = SymbolAtom.GetAtom(name);
return(!result.IsDelimeter ? null : result);
}
private Atom AttachScripts(TexFormula formula, string value, ref int position, Atom atom)
{
SkipWhiteSpace(value, ref position);
if (position == value.Length)
{
return(atom);
}
// Check for prime marks.
var primesRowAtom = new RowAtom();
var i = position + 1;
while (i < value.Length)
{
if (value[i] == primeChar)
{
primesRowAtom.Add(SymbolAtom.GetAtom("prime"));
}
else if (!IsWhiteSpace(value[i]))
{
break;
}
position++;
i++;
}
// Attach prime marks as superscript, if any were found.
if (primesRowAtom.Elements.Count > 0)
{
atom = new ScriptsAtom(atom, null, primesRowAtom);
}
TexFormula superscriptFormula = null;
TexFormula subscriptFormula = null;
var ch = value[position];
switch (ch)
{
case superScriptChar:
// Attach superscript.
position++;
superscriptFormula = ReadScript(formula, value, ref position);
SkipWhiteSpace(value, ref position);
if (position < value.Length && value[position] == subScriptChar)
{
// Attach subscript also.
position++;
subscriptFormula = ReadScript(formula, value, ref position);
}
break;
case subScriptChar:
// Add subscript.
position++;
subscriptFormula = ReadScript(formula, value, ref position);
SkipWhiteSpace(value, ref position);
if (position < value.Length && value[position] == superScriptChar)
{
// Attach superscript also.
position++;
superscriptFormula = ReadScript(formula, value, ref position);
}
break;
}
if (superscriptFormula is null && subscriptFormula is null)
{
return(atom);
}
// Check whether to return Big Operator or Scripts.
if (atom.GetRightType() == TexAtomType.BigOperator)
{
return(new BigOperatorAtom(atom, subscriptFormula?.RootAtom,
superscriptFormula?.RootAtom));
}
return(new ScriptsAtom(atom, subscriptFormula?.RootAtom,
superscriptFormula?.RootAtom));
}
private void ProcessEscapeSequence(TexFormula formula, string value, ref int position)
{
var result = new StringBuilder();
position++;
while (position < value.Length)
{
var ch = value[position];
var isEnd = position == value.Length - 1;
if (!char.IsLetter(ch) || isEnd)
{
// Escape sequence has ended.
if (isEnd)
{
result.Append(ch);
position++;
}
break;
}
result.Append(ch);
position++;
}
var command = result.ToString();
SymbolAtom symbolAtom = null;
try
{
symbolAtom = SymbolAtom.GetAtom(command);
} catch (SymbolNotFoundException)
{
}
var predefinedFormula = GetFormula(command);
if (symbolAtom != null)
{
// Symbol was found.
formula.Add(AttachScripts(formula, value, ref position, symbolAtom));
}
else if (predefinedFormula != null)
{
// Predefined formula was found.
formula.Add(AttachScripts(formula, value, ref position, predefinedFormula.RootAtom));
}
else if (command.Equals("nbsp"))
{
// Space was found.
formula.Add(AttachScripts(formula, value, ref position, new SpaceAtom()));
}
else if (textStyles.Contains(command))
{
// Text style was found.
SkipWhiteSpace(value, ref position);
var styledFormula = Parse(ReadGroup(formula, value, ref position, leftGroupChar, rightGroupChar));
styledFormula.TextStyle = command;
formula.Add(AttachScripts(formula, value, ref position, styledFormula.RootAtom));
}
else if (commands.Contains(command))
{
// Command was found.
formula.Add(AttachScripts(formula, value, ref position, ProcessCommand(formula, value, ref position,
command)));
}
else
{
// Escape sequence is invalid.
throw new TexParseException("Unknown symbol or command or predefined TeXFormula: '" + command + "'");
}
}