private void ChangeAtomToOrdinary(DummyAtom currentAtom, DummyAtom previousAtom, Atom nextAtom)
{
var type = currentAtom.GetLeftType();
if (type == TexAtomType.BinaryOperator && (previousAtom == null ||
binaryOperatorChangeSet[(int)previousAtom.GetRightType()]))
{
currentAtom.Type = TexAtomType.Ordinary;
}
else if (nextAtom != null && currentAtom.GetRightType() == TexAtomType.BinaryOperator)
{
var nextType = nextAtom.GetLeftType();
if (nextType == TexAtomType.Relation || nextType == TexAtomType.Closing || nextType == TexAtomType.Punctuation)
{
currentAtom.Type = TexAtomType.Ordinary;
}
}
}
public override Box CreateBox(TexEnvironment environment)
{
// Create result box.
var resultBox = new HorizontalBox(environment.Foreground, environment.Background);
// Create and add box for each atom in row.
for (int i = 0; i < this.Elements.Count; i++)
{
var curAtom = new DummyAtom(this.Elements[i]);
// Change atom type to Ordinary, if required.
var hasNextAtom = i < this.Elements.Count - 1;
var nextAtom = hasNextAtom ? (Atom)this.Elements[i + 1] : null;
ChangeAtomToOrdinary(curAtom, this.PreviousAtom, nextAtom);
// Check if atom is part of ligature or should be kerned.
var kern = 0d;
if (hasNextAtom && curAtom.GetRightType() == TexAtomType.Ordinary && curAtom.IsCharSymbol)
{
if (nextAtom is CharSymbol cs && ligatureKernChangeSet[(int)nextAtom.GetLeftType()])
{
var font = cs.GetStyledFont(environment);
curAtom.IsTextSymbol = true;
var leftAtomCharFont = curAtom.GetCharFont(font);
var rightAtomCharFont = cs.GetCharFont(font);
var ligatureCharFont = font.GetLigature(leftAtomCharFont, rightAtomCharFont);
if (ligatureCharFont == null)
{
// Atom should be kerned.
kern = font.GetKern(leftAtomCharFont, rightAtomCharFont, environment.Style);
}
else
{
// Atom is part of ligature.
curAtom.SetLigature(new FixedCharAtom(ligatureCharFont));
i++;
}
}
}
// Create and add glue box, unless atom is first of row or previous/current atom is kern.
if (i != 0 && this.PreviousAtom != null && !this.PreviousAtom.IsKern && !curAtom.IsKern)
{
resultBox.Add(Glue.CreateBox(this.PreviousAtom.GetRightType(), curAtom.GetLeftType(), environment));
}
// Create and add box for atom.
curAtom.PreviousAtom = this.PreviousAtom;
var curBox = curAtom.CreateBox(environment);
resultBox.Add(curBox);
environment.LastFontId = curBox.GetLastFontId();
// Insert kern, if required.
if (kern > TexUtilities.FloatPrecision)
{
resultBox.Add(new StrutBox(0, kern, 0, 0));
}
if (!curAtom.IsKern)
{
this.PreviousAtom = curAtom;
}
}
// Reset previous atom.
this.PreviousAtom = null;
return(resultBox);
}
public Atom WithPreviousAtom(DummyAtom previousAtom)
{
var rowAtom = this.RowAtom.WithPreviousAtom(previousAtom);
return(new StyledAtom(rowAtom, this.Background, this.Foreground));
}
public Atom WithPreviousAtom(DummyAtom previousAtom) => new RowAtom(previousAtom, this.Elements);
private RowAtom(DummyAtom previousAtom, ReadOnlyCollection <Atom> elements)
{
this.PreviousAtom = previousAtom;
this.Elements = elements;
}
private void ChangeAtomToOrdinary(DummyAtom currentAtom, DummyAtom previousAtom, Atom nextAtom)
{
var type = currentAtom.GetLeftType();
if (type == TexAtomType.BinaryOperator && (previousAtom == null ||
binaryOperatorChangeSet[(int)previousAtom.GetRightType()]))
{
currentAtom.Type = TexAtomType.Ordinary;
}
else if (nextAtom != null && currentAtom.GetRightType() == TexAtomType.BinaryOperator)
{
var nextType = nextAtom.GetLeftType();
if (nextType == TexAtomType.Relation || nextType == TexAtomType.Closing || nextType == TexAtomType.Punctuation)
currentAtom.Type = TexAtomType.Ordinary;
}
}
public override Box CreateBox(TexEnvironment environment)
{
var texFont = environment.TexFont;
// Create result box.
var resultBox = new HorizontalBox(environment.Foreground, environment.Background);
// Create and add box for each atom in row.
for (int i = 0; i < this.Elements.Count; i++)
{
var curAtom = new DummyAtom(this.Elements[i]);
// Change atom type to Ordinary, if required.
var hasNextAtom = i < this.Elements.Count - 1;
var nextAtom = hasNextAtom ? (Atom)this.Elements[i + 1] : null;
ChangeAtomToOrdinary(curAtom, this.PreviousAtom, nextAtom);
// Check if atom is part of ligature or should be kerned.
var kern = 0d;
if (hasNextAtom && curAtom.GetRightType() == TexAtomType.Ordinary && curAtom.IsCharSymbol)
{
if (nextAtom is CharSymbol && ligatureKernChangeSet[(int)nextAtom.GetLeftType()])
{
curAtom.IsTextSymbol = true;
var leftAtomCharFont = curAtom.GetCharFont(texFont);
var rightAtomCharFont = ((CharSymbol)nextAtom).GetCharFont(texFont);
var ligatureCharFont = texFont.GetLigature(leftAtomCharFont, rightAtomCharFont);
if (ligatureCharFont == null)
{
// Atom should be kerned.
kern = texFont.GetKern(leftAtomCharFont, rightAtomCharFont, environment.Style);
}
else
{
// Atom is part of ligature.
curAtom.SetLigature(new FixedCharAtom(ligatureCharFont));
i++;
}
}
}
// Create and add glue box, unless atom is first of row or previous/current atom is kern.
if (i != 0 && this.PreviousAtom != null && !this.PreviousAtom.IsKern && !curAtom.IsKern)
resultBox.Add(Glue.CreateBox(this.PreviousAtom.GetRightType(), curAtom.GetLeftType(), environment));
// Create and add box for atom.
curAtom.PreviousAtom = this.PreviousAtom;
var curBox = curAtom.CreateBox(environment);
resultBox.Add(curBox);
environment.LastFontId = curBox.GetLastFontId();
// Insert kern, if required.
if (kern > TexUtilities.FloatPrecision)
resultBox.Add(new StrutBox(0, kern, 0, 0));
if (!curAtom.IsKern)
this.PreviousAtom = curAtom;
}
// Reset previous atom.
this.PreviousAtom = null;
return resultBox;
}
