public Msubsup(IBuildable[] contents)
{ // handle star superscript
List <IBuildable> localCopy = new List <IBuildable>(contents);
if (localCopy.Count == 3)
{
Mo mo = localCopy[2] as Mo;
if (mo != null && mo.IsTimesOrStar)
{
Mi subscript = localCopy[1] as Mi;
if (subscript != null)
{
subscript.Content += Semantics.starPrefix;
localCopy.RemoveAt(2);
}
else
{
// maybe the subscript is an mrow
Mrow row = localCopy[1] as Mrow;
if (row != null && row.LastElement != null && row.LastElement is WithTextContent)
{
WithTextContent lastElem = (WithTextContent)row.LastElement;
lastElem.Content += Semantics.starPrefix;
localCopy.RemoveAt(2);
}
}
}
}
base.contents = localCopy.ToArray();
}
public override void Visit(StringBuilder sb, BuildContext bc)
{
bc.Tokens.Add(this);
bool needReduce = false;
// note: the use of double is a judgement call here
double result = 0.0;
if (bc.Options.ReduceFractions)
{
Mrow row1 = first as Mrow;
Mrow row2 = second as Mrow;
if (row1 != null && row2 != null && row1.Contents.Length > 0 && row2.Contents.Length > 0)
{
Mn mn1 = row1.Contents[0] as Mn;
Mn mn2 = row2.Contents[0] as Mn;
if (mn1 != null && mn2 != null)
{
try
{
double _1, _2;
if (double.TryParse(mn1.Content, out _1) &&
double.TryParse(mn2.Content, out _2) &&
_2 != 0.0)
{
result = _1 / _2;
needReduce = true;
}
}
catch
{
}
}
}
}
if (needReduce)
{
sb.Append(result);
}
else
{
sb.Append("((");
first.Visit(sb, bc);
sb.Append(") / (");
second.Visit(sb, bc);
sb.Append("))");
// add to checks
bc.PossibleDivisionsByZero.Add(second);
}
}
/// <summary>
/// This function replaces all known inverse trig functions (in the msup blocks)
/// by inverse names, so that sin^-1 becomes arcsin.
/// </summary>
/// <param name="contents">Buidlable contents</param>
private static void ReplaceInverseTrigFunctions(IBuildable[] contents)
{
for (int i = 0; i < contents.Length; i++)
{
IBuildable c = contents[i];
string trigFunction = string.Empty;
if (c is Msup)
{
bool funcIsTrig = false, radixIsNeg1 = false;
Pair <IBuildable, IBuildable> terms = (c as Msup).Values;
if (terms.First is Mrow)
{
Mrow row1 = terms.First as Mrow;
if (row1.Contents.Length > 0 && row1.Contents[0] is Mi)
{
if (Semantics.inverseTrigs.ContainsKey((row1.Contents[0] as Mi).Content))
{
trigFunction = (row1.Contents[0] as Mi).Content;
funcIsTrig = true;
}
}
}
if (terms.Second is Mrow)
{
Mrow row2 = terms.Second as Mrow;
StringBuilder sb = new StringBuilder();
BuildContext bc = new BuildContext();
row2.Visit(sb, bc);
if (sb.ToString() == "-1")
{
radixIsNeg1 = true;
}
}
// if this is an inverse function, replace an <msup> with an inverse <mi>
if (funcIsTrig && radixIsNeg1)
{
Mi mi = new Mi(Semantics.inverseTrigs[trigFunction]);
contents[i] = mi;
}
}
}
}