private Vector2 WrapLine(Vector2 position, List <ICompiledElement> lineBuffer, out float currentLineHeight, CompiledMarkup compiledMarkup)
{
currentLineHeight = 0;
for (var i = 0; i < lineBuffer.Count; i++)
{
currentLineHeight = Math.Max(currentLineHeight, lineBuffer[i].Size.Y);
}
for (var i = 0; i < lineBuffer.Count; i++)
{
lineBuffer[i].Position = new Vector2(lineBuffer[i].Position.X, position.Y + currentLineHeight / 2f);
}
compiledMarkup.AddRange(lineBuffer);
lineBuffer.Clear();
position.X = 0;
position.Y += currentLineHeight;
return(position);
}
public void Compile(string text, float width, CompiledMarkup compiledMarkup)
{
var reader = XmlReader.Create(new StringReader(text));
var position = Vector2.Zero;
var formatingStack = new Stack <FormatInstruction>();
var conditionalsStack = new Stack <bool>();
var lineBuffer = new List <ICompiledElement>();
float currentLineHeight;
float currentTotalHeight = 0;
var maxLineWidth = float.MinValue;
float currentLineWidth = 0;
while (reader.Read())
{
switch (reader.NodeType)
{
case XmlNodeType.Element:
switch (reader.Name)
{
case "text": {
SpriteFont font;
var s = reader.GetAttribute("font");
if (!string.IsNullOrEmpty(s))
{
font = fontResolver.Invoke(s);
}
else if (formatingStack.Count > 0)
{
font = formatingStack.Peek().Font;
}
else
{
throw new InvalidOperationException("Need a font.");
}
Color color;
s = reader.GetAttribute("color");
if (!string.IsNullOrEmpty(s))
{
color = ToColor(s);
}
else if (formatingStack.Count > 0)
{
color = formatingStack.Peek().Color;
}
else
{
throw new InvalidOperationException("Need a color.");
}
formatingStack.Push(new FormatInstruction(font, color));
}
break;
case "if": {
var clause = reader.GetAttribute("clause");
var condition = conditionalResolver.Invoke(clause);
conditionalsStack.Push(condition);
}
break;
case "br": {
if (lineBuffer.Count > 0)
{
position = WrapLine(position, lineBuffer, out currentLineHeight, compiledMarkup);
currentTotalHeight += currentLineHeight;
}
else
{
position.Y += formatingStack.Peek().Font.LineSpacing;
currentTotalHeight += formatingStack.Peek().Font.LineSpacing;
}
currentLineWidth = 0;
}
break;
case "img": {
if (conditionalsStack.Count != 0 && !conditionalsStack.Peek())
{
break;
}
var imgSrc = reader.GetAttribute("src");
var color = Color.White;
var s = reader.GetAttribute("color");
if (!string.IsNullOrEmpty(s))
{
color = ToColor(s);
}
var image = imageResolver.Invoke(imgSrc);
if (position.X + image.Width > width)
{
position = WrapLine(position, lineBuffer, out currentLineHeight, compiledMarkup);
currentTotalHeight += currentLineHeight;
}
lineBuffer.Add(new CompiledImageElement(image, color, position));
position.X += image.Width;
currentLineWidth += image.Width;
}
break;
}
break;
case XmlNodeType.Text: {
if (conditionalsStack.Count != 0 && !conditionalsStack.Peek())
{
break;
}
var currentFormatting = formatingStack.Peek();
var str = reader.Value;
var re = new Regex(@"\s+");
var words = re.Split(str);
var spaceX = currentFormatting.Font.MeasureString(" ").X;
for (var i = 0; i < words.Length; i++)
{
var word = words[i];
var wordSz = currentFormatting.Font.MeasureString(word);
if (position.X + wordSz.X > width)
{
position = WrapLine(position, lineBuffer, out currentLineHeight, compiledMarkup);
currentTotalHeight += currentLineHeight;
maxLineWidth = Math.Max(maxLineWidth, currentLineWidth);
currentLineWidth = 0;
}
lineBuffer.Add(new CompiledTextElement(word, position, currentFormatting));
position.X += wordSz.X;
currentLineWidth += wordSz.X;
if (i < words.Length - 1)
{
position.X += spaceX;
currentLineWidth += spaceX;
}
}
}
break;
case XmlNodeType.EndElement: {
switch (reader.Name)
{
case "text":
formatingStack.Pop();
break;
case "if":
conditionalsStack.Pop();
break;
}
}
break;
}
}
if (lineBuffer.Count > 0)
{
WrapLine(position, lineBuffer, out currentLineHeight, compiledMarkup);
foreach (var element in lineBuffer)
{
element.Position = new Vector2(element.Position.X, position.Y + currentLineHeight / 2f);
}
maxLineWidth = Math.Max(maxLineWidth, currentLineWidth);
currentTotalHeight += currentLineHeight;
compiledMarkup.Size = new Vector2(maxLineWidth, currentTotalHeight);
compiledMarkup.AddRange(lineBuffer);
lineBuffer.Clear();
}
compiledMarkup.Text = text;
}