Atom Root(TexFormula formula, string value, ref int position)
{
TexFormula degreeFormula = Parse(ReadInsideBracket(value, ref position));
return(Radical.Get(Parse(ReadGroup(value, ref position, leftGroupChar, rightGroupChar))
.ExtractRoot(), degreeFormula == null ? null : degreeFormula.ExtractRoot()));
}
public void Add(TexFormula formula)
{
if (formula.RootAtom is RowAtom)
{
Add(RowAtom.Get(formula.ExtractRoot()));
}
else
{
Add(formula.RootAtom);
}
}
private Atom AttachScripts(TexFormula formula, string value, ref int position, Atom atom)
{
if (position == value.Length)
{
return(atom);
}
if (value[position] == superScriptChar || value[position] == subScriptChar)
{
if (position == value.Length - 1)
{
position++;
return(atom);
}
}
else
{
return(atom);
}
TexFormula superscriptFormula = null;
TexFormula subscriptFormula = null;
//0: Undetermined; 1: Not Yet; 2: Yes, we are; 3: Yes, and make it smaller
int markAsBig = 0;
//0: In Beginning;1: We are in _;2: we are in ^
int lastIsSuper = 0;
while (position < value.Length)
{
var ch = value[position];
if (ch == superScriptChar || ch == subScriptChar)
{
if (++position < value.Length && (value[position] == ch))
{
markAsBig = 2;
if (++position < value.Length && (value[position] == ch))
{
markAsBig = 3;
position++;
}
}
bool v = ch == superScriptChar;
if ((v ? superscriptFormula : subscriptFormula) == null)
{
lastIsSuper = v ? 2 : 1;
}
continue;
}
else if (ch == rightGroupChar || (value[position - 1] != '^' && value[position - 1] != '_'))
{
break;
}
if (lastIsSuper == 2)
{
if (superscriptFormula == null)
{
superscriptFormula = ReadScript(formula, value, ref position);
}
else
{
position--;
superscriptFormula.RootAtom = AttachScripts(formula, value, ref position, superscriptFormula.RootAtom);
}
}
else if (lastIsSuper == 1)
{
if (subscriptFormula == null)
{
subscriptFormula = ReadScript(formula, value, ref position);
}
else
{
position--;
subscriptFormula.RootAtom = AttachScripts(formula, value, ref position, subscriptFormula.RootAtom);
}
}
else
{
break;
}
}
if (superscriptFormula == null && subscriptFormula == null)
{
return(atom);
}
// Check whether to return Big Operator or Scripts.
if (atom != null && (atom.RightType == CharType.BigOperator || markAsBig >= 2))
{
return(BigOperatorAtom.Get(atom, subscriptFormula == null ? null : subscriptFormula.ExtractRoot(),
superscriptFormula == null ? null : superscriptFormula.ExtractRoot(), markAsBig == 3));
}
else
{
return(ScriptsAtom.Get(atom, subscriptFormula == null ? null : subscriptFormula.ExtractRoot(),
superscriptFormula == null ? null : superscriptFormula.ExtractRoot()));
}
}
