public static void RemoveAt(this MathList self, ref MathListIndex index)
{
index ??= MathListIndex.Level0Index(0);
if (index.AtomIndex > self.Atoms.Count)
{
throw new IndexOutOfRangeException($"Index {index.AtomIndex} is out of bounds for list of size {self.Atoms.Count}");
}
switch (index.SubIndexType)
{
case MathListSubIndexType.None:
self.RemoveAt(index.AtomIndex);
break;
case var _ when index.SubIndex is null:
throw new InvalidCodePathException("index.SubIndex is null despite non-None subindex type");
case MathListSubIndexType.BetweenBaseAndScripts:
var currentAtom = self.Atoms[index.AtomIndex];
if (currentAtom.Subscript.IsEmpty() && currentAtom.Superscript.IsEmpty())
{
throw new SubIndexTypeMismatchException(index);
}
var downIndex = index.LevelDown();
if (downIndex is null)
{
throw new InvalidCodePathException("downIndex is null");
}
if (index.AtomIndex > 0 &&
self.Atoms[index.AtomIndex - 1] is MathAtom previous &&
previous.Subscript.IsEmpty() &&
previous.Superscript.IsEmpty() &&
previous switch
{
Atoms.BinaryOperator _ => false,
Atoms.UnaryOperator _ => false,
Atoms.Relation _ => false,
Atoms.Punctuation _ => false,
Atoms.Space _ => false,
_ => true
})
{
previous.Superscript.Append(currentAtom.Superscript);
previous.Subscript.Append(currentAtom.Subscript);
self.RemoveAt(index.AtomIndex);
// it was in the nucleus and we removed it, get out of the nucleus and get in the nucleus of the previous one.
index = downIndex.Previous is MathListIndex downPrev
? downPrev.LevelUpWithSubIndex(MathListSubIndexType.BetweenBaseAndScripts, MathListIndex.Level0Index(1))
: downIndex;
break;
}
// insert placeholder since we couldn't place the scripts in previous atom
var insertionAtom = LaTeXSettings.Placeholder;
insertionAtom.Subscript.Append(currentAtom.Subscript);
insertionAtom.Superscript.Append(currentAtom.Superscript);
self.RemoveAt(index.AtomIndex);
index = downIndex;
self.InsertAndAdvance(ref index, insertionAtom, MathListSubIndexType.None);
index = index.Previous ?? throw new InvalidCodePathException("Cannot go back after insertion?");
return;
public static MathListIndex IndexForPoint <TFont, TGlyph>(this FractionDisplay <TFont, TGlyph> self, TypesettingContext <TFont, TGlyph> context, PointF point) where TFont : IFont <TGlyph>
{
// We can be before or after the fraction
if (point.X < self.Position.X - PixelDelta)
{
//We are before the fraction, so
return(MathListIndex.Level0Index(self.Range.Location));
}
else if (point.X > self.Position.X + self.Width + PixelDelta)
{
//We are after the fraction
return(MathListIndex.Level0Index(self.Range.End));
}
if (point.Y > self.LinePosition + PixelDelta)
{
return(MathListIndex.IndexAtLocation(self.Range.Location, MathListSubIndexType.Numerator, self.Numerator.IndexForPoint(context, point)));
}
else if (point.Y < self.LinePosition - PixelDelta)
{
return(MathListIndex.IndexAtLocation(self.Range.Location, MathListSubIndexType.Denominator, self.Denominator.IndexForPoint(context, point)));
}
if (point.X > self.Position.X + self.Width / 2)
{
return(MathListIndex.Level0Index(self.Range.End));
}
return(MathListIndex.Level0Index(self.Range.Location));
}
public static MathListIndex IndexForPoint <TFont, TGlyph>(this FractionDisplay <TFont, TGlyph> self, TypesettingContext <TFont, TGlyph> context, PointF point) where TFont : IFont <TGlyph>
{
// We can be before or after the fraction
if (point.X < self.Position.X - PixelDelta)
{
//We are before the fraction, so
return(MathListIndex.Level0Index(self.Range.Location));
}
else if (point.X > self.Position.X + self.Width + PixelDelta)
{
//We are after the fraction
return(MathListIndex.Level0Index(self.Range.End));
}
//We can be either near the numerator or denominator
var numeratorDistance = DistanceFromPointToRect(point, self.Numerator.DisplayBounds);
var denominatorDistance = DistanceFromPointToRect(point, self.Denominator.DisplayBounds);
if (numeratorDistance < denominatorDistance)
{
return(MathListIndex.IndexAtLocation(self.Range.Location, self.Numerator.IndexForPoint(context, point), MathListSubIndexType.Numerator));
}
else
{
return(MathListIndex.IndexAtLocation(self.Range.Location, self.Denominator.IndexForPoint(context, point), MathListSubIndexType.Denominator));
}
}
public static MathListIndex IndexForPoint <TFont, TGlyph>(this RadicalDisplay <TFont, TGlyph> self, TypesettingContext <TFont, TGlyph> context, PointF point) where TFont : IFont <TGlyph>
{
// We can be before or after the radical
if (point.X < self.Position.X - PixelDelta)
{
//We are before the radical, so
return(MathListIndex.Level0Index(self.Range.Location));
}
else if (point.X > self.Position.X + self.Width + PixelDelta)
{
//We are after the radical
return(MathListIndex.Level0Index(self.Range.End));
}
//We can be either near the degree or the radicand
var degreeRect = self.Degree != null ? new RectangleF(self.Degree.Position, self.Degree.DisplayBounds.Size) : default;
var radicandRect = new RectangleF(self.Radicand.Position, self.Radicand.DisplayBounds.Size);
var degreeDistance = DistanceFromPointToRect(point, degreeRect);
var radicandDistance = DistanceFromPointToRect(point, radicandRect);
if (degreeDistance < radicandDistance)
{
if (self.Degree != null)
{
return(MathListIndex.IndexAtLocation(self.Range.Location, MathListSubIndexType.Degree, self.Degree.IndexForPoint(context, point)));
}
return(MathListIndex.Level0Index(self.Range.Location));
}
else
{
return(MathListIndex.IndexAtLocation(self.Range.Location, MathListSubIndexType.Radicand, self.Radicand.IndexForPoint(context, point)));
}
}
public static MathListIndex IndexForPoint <TFont, TGlyph>(this TextLineDisplay <TFont, TGlyph> self, TypesettingContext <TFont, TGlyph> context, PointF point) where TFont : IFont <TGlyph>
{
// Convert the point to the reference of the CTLine
var relativePoint = new PointF(point.X - self.Position.X, point.Y - self.Position.Y);
var runsAndIndicies =
self.Runs
.Select(run => ValueTuple.Create(run, run.Run.GlyphIndexForXOffset(context, relativePoint.Plus(run.Position).X)))
.Where(x => x.Item2.HasValue)
.ToArray();
if (runsAndIndicies.Length == 0)
{
return(null);
}
var(r, nindex) = runsAndIndicies.Single();
var index = nindex.GetValueOrDefault();
var diffLng = r.Run.Length != r.Range.Length;
if (index < 0 || (!diffLng && index > self.Range.Length) || (diffLng && index > r.Run.Length))
{
throw new InvalidCodePathException($"Returned index out of range: {index}, range ({self.Range.Location}, {self.Range.Length})");
}
if (!diffLng)
{
return(MathListIndex.Level0Index(self.Range.Location + index));
}
if (index > r.Run.Length / 2)
{
return(MathListIndex.Level0Index(self.Range.End));
}
return(MathListIndex.Level0Index(self.Range.Location));
}
public static MathListIndex IndexForPoint <TFont, TGlyph>(this RadicalDisplay <TFont, TGlyph> self, TypesettingContext <TFont, TGlyph> context, PointF point) where TFont : IFont <TGlyph>
{
// We can be before or after the radical
if (point.X < self.Position.X - PixelDelta)
{
//We are before the radical, so
return(MathListIndex.Level0Index(self.Range.Location));
}
else if (point.X > self.Position.X + self.Width + PixelDelta)
{
//We are after the radical
return(MathListIndex.Level0Index(self.Range.End));
}
//We can be either near the degree or the radicand
var degreeDistance = DistanceFromPointToRect(point, self.Degree?.DisplayBounds ?? default);
var radicandDistance = DistanceFromPointToRect(point, self.Radicand.DisplayBounds);
if (degreeDistance < radicandDistance)
{
return(MathListIndex.IndexAtLocation(self.Range.Location, self.Degree.IndexForPoint(context, point), MathListSubIndexType.Numerator));
}
else
{
return(MathListIndex.IndexAtLocation(self.Range.Location, self.Radicand.IndexForPoint(context, point), MathListSubIndexType.Denominator));
}
}
public static MathListIndex IndexForPoint <TFont, TGlyph>(
this IGlyphDisplay <TFont, TGlyph> self,
TypesettingContext <TFont, TGlyph> _,
PointF point) where TFont : IFont <TGlyph> =>
point.X > self.Position.X + self.Width / 2
? MathListIndex.Level0Index(self.Range.End)
: MathListIndex.Level0Index(self.Range.Location);
public static void HighlightCharacterAt <TFont, TGlyph>(
this IGlyphDisplay <TFont, TGlyph> self,
MathListIndex index, Color color) where TFont : IFont <TGlyph>
{
if (index.SubIndexType != MathListSubIndexType.None)
{
throw new ArgumentException
("The subindex must be none to get the highlight a character in it.", nameof(index));
}
self.Highlight(color);
}
public static PointF?PointForIndex <TFont, TGlyph>(
this IGlyphDisplay <TFont, TGlyph> self,
TypesettingContext <TFont, TGlyph> _,
MathListIndex index) where TFont : IFont <TGlyph> =>
index.SubIndexType != MathListSubIndexType.None
? throw new ArgumentException
("The subindex must be none to get the closest point for it.", nameof(index))
: index.AtomIndex == self.Range.End
// draw a caret after the glyph
? self.Position.Plus(new PointF(self.DisplayBounds().Right, 0))
// draw a caret before the glyph
: self.Position;
public static PointF?PointForIndex <TFont, TGlyph>(this ListDisplay <TFont, TGlyph> self, TypesettingContext <TFont, TGlyph> context, MathListIndex index) where TFont : IFont <TGlyph>
{
if (index is null)
{
return(null);
}
PointF?position;
if (index.AtomIndex == self.Range.End)
{
// Special case the edge of the range
position = new PointF(self.Width, 0);
}
else if (self.Range.Contains(index.AtomIndex) && self.SubDisplayForIndex(index) is IDisplay <TFont, TGlyph> display)
{
switch (index.SubIndexType)
{
case MathListSubIndexType.Nucleus:
var nucleusPosition = index.AtomIndex + index.SubIndex.AtomIndex;
position = display.PointForIndex(context, MathListIndex.Level0Index(nucleusPosition));
break;
case MathListSubIndexType.None:
position = display.PointForIndex(context, index);
break;
default:
// Recurse
position = display.PointForIndex(context, index.SubIndex);
break;
}
}
else
{
// Outside the range
return(null);
}
if (position is PointF found)
{
// Convert bounds from our coordinate system before returning
found.X += self.Position.X;
found.Y += self.Position.Y;
return(found);
}
else
{
// We didn't find the position
return(null);
}
}
public static MathListIndex IndexForPoint <TFont, TGlyph>(
this InnerDisplay <TFont, TGlyph> self,
TypesettingContext <TFont, TGlyph> context,
PointF point) where TFont : IFont <TGlyph> =>
// We can be before or after the inner
point.X <self.Position.X + (self.Left?.Width / 2 ?? 0)
//We are before the inner, so
? MathListIndex.Level0Index(self.Range.Location)
: point.X> self.Position.X + self.Width - (self.Right?.Width / 2 ?? 0)
//We are after the inner
? MathListIndex.Level0Index(self.Range.End)
: MathListIndex.IndexAtLocation(self.Range.Location,
MathListSubIndexType.Inner, self.Inner.IndexForPoint(context, point));
public static MathListIndex IndexForPoint <TFont, TGlyph>(
this LargeOpLimitsDisplay <TFont, TGlyph> self,
TypesettingContext <TFont, TGlyph> context,
PointF point) where TFont : IFont <TGlyph> =>
// We can be before or after the large operator
point.X <self.Position.X - PixelDelta
// We are before the large operator, so
?MathListIndex.Level0Index(self.Range.Location)
: point.X> self.Position.X + self.Width + PixelDelta
// We are after the large operator
? MathListIndex.Level0Index(self.Range.End)
: self.UpperLimit is
{
public static MathListIndex IndexForPoint <TFont, TGlyph>(
this RadicalDisplay <TFont, TGlyph> self,
TypesettingContext <TFont, TGlyph> context,
PointF point) where TFont : IFont <TGlyph> =>
// We can be before or after the radical
point.X <self.Position.X - PixelDelta
//We are before the radical, so
?MathListIndex.Level0Index(self.Range.Location)
: point.X> self.Position.X + self.Width + PixelDelta
//We are after the radical
? MathListIndex.Level0Index(self.Range.End)
//We can be either near the degree or the radicand
: DistanceFromPointToRect(point, self.Degree != null ? new RectangleF(self.Degree.Position, self.Degree.DisplayBounds().Size) : default)
< DistanceFromPointToRect(point, new RectangleF(self.Radicand.Position, self.Radicand.DisplayBounds().Size))
? self.Degree != null
? MathListIndex.IndexAtLocation(self.Range.Location, MathListSubIndexType.Degree, self.Degree.IndexForPoint(context, point))
: MathListIndex.Level0Index(self.Range.Location)
: MathListIndex.IndexAtLocation(self.Range.Location, MathListSubIndexType.Radicand, self.Radicand.IndexForPoint(context, point));
static void InsertAtAtomIndexAndAdvance(this MathList self, int atomIndex, MathAtom atom, ref MathListIndex advance, MathListSubIndexType advanceType)
{
if (atomIndex < 0 || atomIndex > self.Count)
{
throw new IndexOutOfRangeException($"Index {atomIndex} is out of bounds for list of size {self.Atoms.Count}");
}
// Test for placeholder to the right of index, e.g. \sqrt{‸■} -> \sqrt{2‸}
if (atomIndex < self.Count && self[atomIndex] is Atoms.Placeholder placeholder)
{
atom.Superscript.Append(placeholder.Superscript);
atom.Subscript.Append(placeholder.Subscript);
self[atomIndex] = atom;
}
else
{
self.Insert(atomIndex, atom);
}
advance = advanceType switch
{
MathListSubIndexType.None => advance.Next,
_ => advance.LevelUpWithSubIndex(advanceType, MathListIndex.Level0Index(0)),
};
}
public static IMathAtom AtomAt(this IMathList self, MathListIndex index)
{
if (index is null || index.AtomIndex >= self.Atoms.Count)
{
return(null);
}
var atom = self.Atoms[index.AtomIndex];
switch (index.SubIndexType)
{
case MathListSubIndexType.None:
case MathListSubIndexType.Nucleus:
return(atom);
case MathListSubIndexType.Subscript:
return(atom.Subscript.AtomAt(index.SubIndex));
case MathListSubIndexType.Superscript:
return(atom.Superscript.AtomAt(index.SubIndex));
case MathListSubIndexType.Radicand:
case MathListSubIndexType.Degree:
if (atom is Radical radical && radical.AtomType == Enumerations.MathAtomType.Radical)
{
if (index.SubIndexType == MathListSubIndexType.Degree)
{
return(radical.Degree.AtomAt(index.SubIndex));
}
else
{
return(radical.Radicand.AtomAt(index.SubIndex));
}
}
else
{
return(null);
}
public static MathListIndex IndexForPoint <TFont, TGlyph>(this TextLineDisplay <TFont, TGlyph> self, TypesettingContext <TFont, TGlyph> context, PointF point) where TFont : IFont <TGlyph>
{
// Convert the point to the reference of the CTLine
var relativePoint = new PointF(point.X - self.Position.X, point.Y - self.Position.Y);
var indices = self.Runs.Select(run => run.Run.GlyphIndexForXOffset(context, relativePoint.Plus(run.Position).X)).Where(x => x.HasValue);
if (indices.IsEmpty())
{
return(null);
}
var index = indices.Single().GetValueOrDefault();
// The index returned is in UTF-16, translate to codepoint index.
// NSUInteger codePointIndex = stringIndexToCodePointIndex(self.attributedString.string, index);
// Convert the code point index to an index into the mathlist
var mlIndex = self.StringIndexToMathListIndex(index);
// index will be between 0 and _range.length inclusive
if (mlIndex < 0 || mlIndex > self.Range.Length)
{
throw new InvalidCodePathException($"Returned index out of range: {index}, range ({self.Range.Location}, {self.Range.Length})");
}
// translate to the current index
return(MathListIndex.Level0Index(self.Range.Location + mlIndex));
}
public SubIndexTypeMismatchException(Type atomType, MathListIndex index) : base(
$"{atomType} not found at index {index.AtomIndex}.")
{
}
public static PointF?PointForIndex <TFont, TGlyph>(this FractionDisplay <TFont, TGlyph> self, TypesettingContext <TFont, TGlyph> context, MathListIndex index) where TFont : IFont <TGlyph>
{
if (index.SubIndexType != MathListSubIndexType.None)
{
throw Arg("The subindex must be none to get the closest point for it.", nameof(index));
}
// draw a caret after the fraction
return(new PointF(self.DisplayBounds.Right, self.Position.Y));
}
public static MathListIndex?IndexForPoint <TFont, TGlyph>
(this ListDisplay <TFont, TGlyph> self, TypesettingContext <TFont, TGlyph> context, PointF point)
where TFont : IFont <TGlyph>
{
// The origin of for the subelements of a MathList is the current position,
// so translate the current point to our origin.
var translatedPoint = new PointF(point.X - self.Position.X, point.Y - self.Position.Y);
IDisplay <TFont, TGlyph>?closest = null;
var xbounds = new List <IDisplay <TFont, TGlyph> >();
float minDistance = float.MaxValue;
foreach (var display in self.Displays)
{
var bounds = display.DisplayBounds();
var rect = new RectangleF(display.Position, bounds.Size);
var maxBoundsX = rect.Right;
if (rect.X - PixelDelta <= translatedPoint.X && translatedPoint.X <= maxBoundsX + PixelDelta)
{
xbounds.Add(display);
}
var distance = DistanceFromPointToRect(translatedPoint, rect);
if (distance < minDistance)
{
closest = display;
minDistance = distance;
}
}
IDisplay <TFont, TGlyph>?displayWithPoint;
switch (xbounds.Count)
{
case 0:
if (translatedPoint.X <= -PixelDelta)
{
// All the way to the left
return(self.Range.Location < 0
? null
: MathListIndex.Level0Index(self.Range.Location));
}
else if (translatedPoint.X >= self.Width + PixelDelta)
{
// if closest is a script
if (closest is ListDisplay <TFont, TGlyph> ld && ld.LinePosition != LinePosition.Regular)
{
// then we try to find its parent
var parent = self.Displays.FirstOrDefault(d => d.HasScript && d.Range.Contains(ld.IndexInParent));
if (parent != null)
{
return(MathListIndex.Level0Index(parent.Range.End));
}
}
// All the way to the right
return
(self.Range.End < 0
? null
: self.Displays.Count == 1 &&
self.Displays[0] is TextLineDisplay <TFont, TGlyph> {
Atoms : var atoms
} &&
atoms.Count == 1 &&
atoms[0] is Atom.Atoms.Placeholder
? MathListIndex.Level0Index(self.Range.Location)
: MathListIndex.Level0Index(self.Range.End));
}
public static MathListIndex IndexForPoint <TFont, TGlyph>(this ListDisplay <TFont, TGlyph> self, TypesettingContext <TFont, TGlyph> context, PointF point) where TFont : IFont <TGlyph>
{
// The origin of for the subelements of a MathList is the current position, so translate the current point to our origin.
var translatedPoint = new PointF(point.X - self.Position.X, point.Y - self.Position.Y);
IDisplay <TFont, TGlyph> closest = null;
var xbounds = new List <IDisplay <TFont, TGlyph> >();
float minDistance = float.MaxValue;
foreach (var display in self.Displays)
{
var bounds = display.DisplayBounds;
var rect = new RectangleF(display.Position, bounds.Size);
var maxBoundsX = rect.Right;
if (rect.X - PixelDelta <= translatedPoint.X && translatedPoint.X <= maxBoundsX + PixelDelta)
{
xbounds.Add(display);
}
var distance = DistanceFromPointToRect(translatedPoint, rect);
if (distance < minDistance)
{
closest = display;
minDistance = distance;
}
}
IDisplay <TFont, TGlyph> displayWithPoint;
switch (xbounds.Count)
{
case 0:
if (translatedPoint.X <= -PixelDelta)
{
// All the way to the left
return(self.Range.Location < 0 ? null : MathListIndex.Level0Index(self.Range.Location));
}
else if (translatedPoint.X >= self.Width + PixelDelta)
{
// if closest is a script
if (closest != null && closest is ListDisplay <TFont, TGlyph> ld &&
ld.LinePosition != Enumerations.LinePosition.Regular)
{
// then we try to find its parent
var parent = self.Displays.FirstOrDefault(d => d.HasScript && d.Range.Contains(ld.IndexInParent));
if (parent != null)
{
return(MathListIndex.Level0Index(parent.Range.End));
}
}
// All the way to the right
return(self.Range.End < 0 ? null : MathListIndex.Level0Index(self.Range.End));
}
else
{
// It is within the ListDisplay but not within the X bounds of any sublist. Use the closest in that case.
displayWithPoint = closest;
}
break;
case 1:
displayWithPoint = xbounds[0];
var rect = new RectangleF(displayWithPoint.Position, displayWithPoint.DisplayBounds.Size);
if (translatedPoint.X >= self.Width - PixelDelta)
{
//The point is close to the end. Only use the selected X bounds if the Y is within range.
if (translatedPoint.Y <= rect.YMin() - PixelDelta)
{
//The point is less than the Y including the delta. Move the cursor to the end rather than in this atom.
return(MathListIndex.Level0Index(self.Range.End));
}
}
break;
default:
//Use the closest since there are more than 2 sublists which have this X position.
displayWithPoint = closest;
break;
}
if (displayWithPoint is null)
{
return(null);
}
var index = displayWithPoint.IndexForPoint(context, translatedPoint);
if (displayWithPoint is ListDisplay <TFont, TGlyph> closestLine)
{
if (closestLine.LinePosition is Enumerations.LinePosition.Regular)
{
throw Arg($"{nameof(ListDisplay<TFont, TGlyph>)} {nameof(ListDisplay<TFont, TGlyph>.LinePosition)} {nameof(Enumerations.LinePosition.Regular)} " +
$"inside an {nameof(ListDisplay<TFont, TGlyph>)} - shouldn't happen", nameof(self));
}
// This is a subscript or a superscript, return the right type of subindex
var indexType = closestLine.LinePosition is Enumerations.LinePosition.Subscript ? MathListSubIndexType.Subscript : MathListSubIndexType.Superscript;
// The index of the atom this denotes.
if (closestLine.IndexInParent is int.MinValue)
{
throw Arg($"Index was not set for a {indexType} in the {nameof(ListDisplay<TFont, TGlyph>)}.", nameof(self));
}
return(MathListIndex.IndexAtLocation(closestLine.IndexInParent, indexType, index));
}
else if (displayWithPoint.HasScript)
{
//The display list has a subscript or a superscript. If the index is at the end of the atom, then we need to put it before the sub/super script rather than after.
if (index?.AtomIndex == displayWithPoint.Range.End)
{
return(MathListIndex.IndexAtLocation(index.AtomIndex - 1, MathListSubIndexType.BetweenBaseAndScripts, MathListIndex.Level0Index(1)));
}
}
return(index);
}
public static PointF?PointForIndex <TFont, TGlyph>(this RadicalDisplay <TFont, TGlyph> self, TypesettingContext <TFont, TGlyph> context, MathListIndex index) where TFont : IFont <TGlyph>
{
if (index.SubIndexType != MathListSubIndexType.None)
{
throw Arg("The subindex must be none to get the closest point for it.", nameof(index));
}
if (index.AtomIndex == self.Range.End)
{
// draw a caret after the radical
return(self.Position.Plus(new PointF(self.DisplayBounds.Right, 0)));
}
// draw a caret before the radical
return(self.Position);
}
///<summary>The bounds of the display indicated by the given index</summary>
public static PointF?PointForIndex <TFont, TGlyph>(this IDisplay <TFont, TGlyph> display, FrontEnd.TypesettingContext <TFont, TGlyph> context, MathListIndex index) where TFont : IFont <TGlyph>
{
switch (display)
{
case TextLineDisplay <TFont, TGlyph> text:
return(text.PointForIndex(context, index));
case FractionDisplay <TFont, TGlyph> frac:
return(frac.PointForIndex(context, index));
case RadicalDisplay <TFont, TGlyph> radical:
return(radical.PointForIndex(context, index));
case ListDisplay <TFont, TGlyph> list:
return(list.PointForIndex(context, index));
default:
return(null);
}
}
public static void HighlightCharacterAt <TFont, TGlyph>(this IDisplay <TFont, TGlyph> display, MathListIndex index, Structures.Color color) where TFont : IFont <TGlyph>
{
switch (display)
{
case TextLineDisplay <TFont, TGlyph> text:
text.HighlightCharacterAt(index, color);
break;
case FractionDisplay <TFont, TGlyph> frac:
frac.HighlightCharacterAt(index, color);
break;
case RadicalDisplay <TFont, TGlyph> radical:
radical.HighlightCharacterAt(index, color);
break;
case ListDisplay <TFont, TGlyph> list:
list.HighlightCharacterAt(index, color);
break;
default:
break;
}
}
static void InsertAtAtomIndexAndAdvance(this IMathList self, int atomIndex, IMathAtom atom, ref MathListIndex advance, MathListSubIndexType advanceType)
{
if (atomIndex < 0 || atomIndex > self.Count)
{
throw new IndexOutOfRangeException($"Index {atomIndex} is out of bounds for list of size {self.Atoms.Count}");
}
// Test for placeholder to the right of index, e.g. \sqrt{‸■} -> \sqrt{2‸}
if (atomIndex < self.Count && self[atomIndex] is MathAtom placeholder &&
placeholder?.AtomType is Enumerations.MathAtomType.Placeholder)
{
if (placeholder.Superscript is IMathList super)
{
if (atom.Superscript != null)
{
super.Append(atom.Superscript);
}
atom.Superscript = super;
}
if (placeholder.Subscript is IMathList sub)
{
if (atom.Subscript != null)
{
sub.Append(atom.Subscript);
}
atom.Subscript = sub;
}
self[atomIndex] = atom;
}
public static PointF?PointForIndex <TFont, TGlyph>(this ListDisplay <TFont, TGlyph> self, TypesettingContext <TFont, TGlyph> context, MathListIndex index) where TFont : IFont <TGlyph>
{
if (index is null)
{
return(null);
}
PointF?position = null;
var nonScripted =
self.Displays
.Where(d => !(d is ListDisplay <TFont, TGlyph> ld &&
ld.LinePosition != Enumerations.LinePosition.Regular))
.ToArray();
if (index.SubIndexType == MathListSubIndexType.None &&
nonScripted.Length > 0 &&
nonScripted.All(d => d.Range.End <= index.AtomIndex))
{
position = new PointF(self.Width, 0);
}
else
{
if (index.AtomIndex == self.Range.End)
{
// Special case the edge of the range
position = new PointF(self.Width, 0);
}
else if (self.Range.Contains(index.AtomIndex) && self.SubDisplayForIndex(index) is IDisplay <TFont, TGlyph> display)
{
switch (index.SubIndexType)
{
case MathListSubIndexType.BetweenBaseAndScripts:
var nucleusPosition = index.AtomIndex + index.SubIndex.AtomIndex;
position = display.PointForIndex(context, MathListIndex.Level0Index(nucleusPosition));
break;
case MathListSubIndexType.None:
if (!display.HasScript)
{
position = display.PointForIndex(context, index);
}
else
{
var mainPosition = display.PointForIndex(context, index);
position = self.Displays.SingleOrDefault(d =>
d is ListDisplay <TFont, TGlyph> ld && ld.IndexInParent == index.AtomIndex - 1)
is IDisplay <TFont, TGlyph> scripted && mainPosition != null
? new PointF(mainPosition.Value.X + scripted.Width, 0)
: mainPosition;
}
break;
default:
// Recurse
position = display.PointForIndex(context, index.SubIndex);
break;
}
}
else
{
// Outside the range
return(null);
}
}
if (position is PointF found)
{
// Convert bounds from our coordinate system before returning
found.X += self.Position.X;
found.Y += self.Position.Y;
return(found);
}
else
{
// We didn't find the position
return(null);
}
}
public static void HighlightCharacterAt <TFont, TGlyph>(this ListDisplay <TFont, TGlyph> self, MathListIndex index, Color color) where TFont : IFont <TGlyph>
{
if (index is null)
{
return;
}
if (self.Range.Contains(index.AtomIndex) && self.SubDisplayForIndex(index) is IDisplay <TFont, TGlyph> display)
{
if (index.SubIndexType is MathListSubIndexType.BetweenBaseAndScripts || index.SubIndexType is MathListSubIndexType.None)
{
display.HighlightCharacterAt(index, color);
}
else
{
// Recurse
display.HighlightCharacterAt(index.SubIndex, color);
}
}
}
/// <summary>Inserts <paramref name="atom"/> and modifies <paramref name="index"/> to advance to the next position.</summary>
public static void InsertAndAdvance(this MathList self, ref MathListIndex index, MathAtom atom, MathListSubIndexType advanceType)
{
index ??= MathListIndex.Level0Index(0);
if (index.AtomIndex > self.Atoms.Count)
{
throw new IndexOutOfRangeException($"Index {index.AtomIndex} is out of bounds for list of size {self.Atoms.Count}");
}
switch (index.SubIndexType)
{
case MathListSubIndexType.None:
self.InsertAtAtomIndexAndAdvance(index.AtomIndex, atom, ref index, advanceType);
break;
case var _ when index.SubIndex is null:
throw new InvalidCodePathException("index.SubIndex is null despite non-None subindex type");
case MathListSubIndexType.BetweenBaseAndScripts:
var currentAtom = self.Atoms[index.AtomIndex];
if (currentAtom.Subscript.IsEmpty() && currentAtom.Superscript.IsEmpty())
{
throw new SubIndexTypeMismatchException(index);
}
if (atom.Subscript.IsNonEmpty() || atom.Superscript.IsNonEmpty())
{
throw new ArgumentException("Cannot fuse with an atom that already has a subscript or a superscript");
}
atom.Subscript.Append(currentAtom.Subscript);
atom.Superscript.Append(currentAtom.Superscript);
currentAtom.Subscript.Clear();
currentAtom.Superscript.Clear();
var atomIndex = index.AtomIndex;
// Prevent further subindexing inside BetweenBaseAndScripts
if (advanceType != MathListSubIndexType.None &&
index.LevelDown() is MathListIndex levelDown)
{
index = levelDown.Next;
}
self.InsertAtAtomIndexAndAdvance(atomIndex + 1, atom, ref index, advanceType);
break;
case MathListSubIndexType.Degree:
case MathListSubIndexType.Radicand:
if (!(self.Atoms[index.AtomIndex] is Atoms.Radical radical))
{
throw new SubIndexTypeMismatchException(typeof(Atoms.Radical), index);
}
if (index.SubIndexType == MathListSubIndexType.Degree)
{
radical.Degree.InsertAndAdvance(ref index.SubIndex, atom, advanceType);
}
else
{
radical.Radicand.InsertAndAdvance(ref index.SubIndex, atom, advanceType);
}
break;
case MathListSubIndexType.Numerator:
case MathListSubIndexType.Denominator:
if (!(self.Atoms[index.AtomIndex] is Atoms.Fraction frac))
{
throw new SubIndexTypeMismatchException(typeof(Atoms.Fraction), index);
}
if (index.SubIndexType == MathListSubIndexType.Numerator)
{
frac.Numerator.InsertAndAdvance(ref index.SubIndex, atom, advanceType);
}
else
{
frac.Denominator.InsertAndAdvance(ref index.SubIndex, atom, advanceType);
}
break;
case MathListSubIndexType.Subscript:
self.Atoms[index.AtomIndex].Subscript.InsertAndAdvance(ref index.SubIndex, atom, advanceType);
break;
case MathListSubIndexType.Superscript:
self.Atoms[index.AtomIndex].Superscript.InsertAndAdvance(ref index.SubIndex, atom, advanceType);
break;
case MathListSubIndexType.Inner:
if (!(self.Atoms[index.AtomIndex] is Atoms.Inner inner))
{
throw new SubIndexTypeMismatchException(typeof(Atoms.Inner), index);
}
inner.InnerList.InsertAndAdvance(ref index.SubIndex, atom, advanceType);
break;
default:
throw new SubIndexTypeMismatchException(index);
}
}
public static IDisplay <TFont, TGlyph> SubDisplayForIndex <TFont, TGlyph>(this ListDisplay <TFont, TGlyph> self, MathListIndex index) where TFont : IFont <TGlyph>
{
// Inside the range
if (index.SubIndexType is MathListSubIndexType.Superscript || index.SubIndexType is MathListSubIndexType.Subscript)
{
foreach (var display in self.Displays)
{
if (display is ListDisplay <TFont, TGlyph> list && index.AtomIndex == list.IndexInParent &&
// This is the right character for the sub/superscript, check that it's type matches the index
((list.LinePosition is Enumerations.LinePosition.Subscript && index.SubIndexType is MathListSubIndexType.Subscript) ||
(list.LinePosition is Enumerations.LinePosition.Superscript && index.SubIndexType is MathListSubIndexType.Superscript)))
{
return(list);
}
else
{
}
}
public SubIndexTypeMismatchException(MathListIndex index) : base(
Array.IndexOf(typeof(MathListSubIndexType).GetEnumValues(), index.SubIndexType) == -1
? $"{index.SubIndexType} is an invalid subindex type."
: $"{index.SubIndexType} not found at index {index.AtomIndex}.")
{
}
public static void RemoveAt(this IMathList self, MathListIndex index)
{
index = index ?? MathListIndex.Level0Index(0);
if (index.AtomIndex > self.Atoms.Count)
{
throw new IndexOutOfRangeException($"Index {index.AtomIndex} is out of bounds for list of size {self.Atoms.Count}");
}
switch (index.SubIndexType)
{
case MathListSubIndexType.None:
self.RemoveAt(index.AtomIndex);
break;
case MathListSubIndexType.Nucleus:
var currentAtom = self.Atoms[index.AtomIndex];
if (currentAtom.Subscript == null && currentAtom.Superscript == null)
{
throw new SubIndexTypeMismatchException("Nuclear fission is not supported if there are no subscripts or superscripts.");
}
if (index.AtomIndex > 0)
{
var previous = self.Atoms[index.AtomIndex - 1];
if (previous.Subscript != null && previous.Superscript != null)
{
previous.Superscript = currentAtom.Superscript;
previous.Subscript = currentAtom.Subscript;
self.RemoveAt(index.AtomIndex);
break;
}
}
// no previous atom or the previous atom sucks (has sub/super scripts)
currentAtom.Nucleus = "";
break;
case MathListSubIndexType.Radicand:
case MathListSubIndexType.Degree:
if (!(self.Atoms[index.AtomIndex] is Radical radical && radical.AtomType == Enumerations.MathAtomType.Radical))
{
throw new SubIndexTypeMismatchException($"No radical found at index {index.AtomIndex}");
}
if (index.SubIndexType == MathListSubIndexType.Degree)
{
radical.Degree.RemoveAt(index.SubIndex);
}
else
{
radical.Radicand.RemoveAt(index.SubIndex);
}
break;
case MathListSubIndexType.Numerator:
case MathListSubIndexType.Denominator:
if (!(self.Atoms[index.AtomIndex] is Fraction frac && frac.AtomType == Enumerations.MathAtomType.Fraction))
{
throw new SubIndexTypeMismatchException($"No fraction found at index {index.AtomIndex}");
}
if (index.SubIndexType == MathListSubIndexType.Numerator)
{
frac.Numerator.RemoveAt(index.SubIndex);
}
else
{
frac.Denominator.RemoveAt(index.SubIndex);
}
break;
case MathListSubIndexType.Subscript:
var current = self.Atoms[index.AtomIndex];
if (current.Subscript == null)
{
throw new SubIndexTypeMismatchException($"No subscript for atom at index {index.AtomIndex}");
}
current.Subscript.RemoveAt(index.SubIndex);
break;
case MathListSubIndexType.Superscript:
current = self.Atoms[index.AtomIndex];
if (current.Superscript == null)
{
throw new SubIndexTypeMismatchException($"No superscript for atom at index {index.AtomIndex}");
}
current.Superscript.RemoveAt(index.SubIndex);
break;
}
}