/// <summary>
/// Processes a parser token with type <see cref="TextParserTokenType.PopLink"/>.
/// </summary>
private void ProcessPopLinkToken(TextLayoutCommandStream output,
ref TextParserToken token, ref LayoutState state, ref Int32 index)
{
output.WritePopLink();
state.AdvanceLineToNextCommand();
index++;
}
/// <summary>
/// Processes a parser token with type <see cref="TextParserTokenType.PopStyle"/>.
/// </summary>
private void ProcessPopStyleToken(TextLayoutCommandStream output, ref Boolean bold, ref Boolean italic,
ref TextParserToken token, ref LayoutState state, ref Int32 index)
{
output.WritePopStyle();
state.AdvanceLineToNextCommand();
PopStyle(ref bold, ref italic);
index++;
}
/// <summary>
/// Processes a parser token with type <see cref="TextParserTokenType.PushLink"/>.
/// </summary>
private void ProcessPushLinkToken(TextLayoutCommandStream output,
ref TextParserToken token, ref LayoutState state, ref Int32 index)
{
var pushedLinkTargetIndex = RegisterLinkTargetWithCommandStream(output, token.Text);
output.WritePushLink(new TextLayoutLinkCommand(pushedLinkTargetIndex));
state.AdvanceLineToNextCommand();
index++;
}
/// <summary>
/// Processes a parser token with type <see cref="TextParserTokenType.PushColor"/>.
/// </summary>
private void ProcessPushColorToken(TextLayoutCommandStream output,
ref TextParserToken token, ref LayoutState state, ref Int32 index)
{
var pushedColor = ParseColor(token.Text);
output.WritePushColor(new TextLayoutColorCommand(pushedColor));
state.AdvanceLineToNextCommand();
index++;
}
/// <summary>
/// Processes a parser token with type <see cref="TextParserTokenType.PushGlyphShader"/>.
/// </summary>
private void ProcessPushGlyphShaderToken(TextLayoutCommandStream output,
ref TextParserToken token, ref LayoutState state, ref Int32 index)
{
var pushedGlyphShader = default(GlyphShader);
var pushedGlyphShaderIndex = RegisterGlyphShaderWithCommandStream(output, token.Text, out pushedGlyphShader);
output.WritePushGlyphShader(new TextLayoutGlyphShaderCommand(pushedGlyphShaderIndex));
state.AdvanceLineToNextCommand();
index++;
}
/// <summary>
/// Processes a parser token with type <see cref="TextParserTokenType.Custom"/>.
/// </summary>
private void ProcessCustomCommandToken(TextLayoutCommandStream output,
ref TextParserToken token, ref LayoutState state, ref Int32 index)
{
var commandID = (token.TokenType - TextParserTokenType.Custom);
var commandValue = token.Text.IsEmpty ? default(Int32) : StringSegmentConversion.ParseInt32(token.Text);
output.WriteCustomCommand(new TextLayoutCustomCommand(commandID, commandValue));
state.AdvanceLineToNextCommand();
index++;
}
/// <summary>
/// Processes a parser token with type <see cref="TextParserTokenType.PushStyle"/>.
/// </summary>
private void ProcessPushStyleToken(TextLayoutCommandStream output, ref Boolean bold, ref Boolean italic,
ref TextParserToken token, ref LayoutState state, ref Int32 index)
{
var pushedStyle = default(TextStyle);
var pushedStyleIndex = RegisterStyleWithCommandStream(output, token.Text, out pushedStyle);
output.WritePushStyle(new TextLayoutStyleCommand(pushedStyleIndex));
state.AdvanceLineToNextCommand();
PushStyle(pushedStyle, ref bold, ref italic);
index++;
}
/// <summary>
/// Processes a parser token with type <see cref="TextParserTokenType.PushFont"/>.
/// </summary>
private void ProcessPushFontToken(TextLayoutCommandStream output,
ref TextParserToken token, ref LayoutState state, ref Int32 index)
{
var pushedFont = default(SpriteFont);
var pushedFontIndex = RegisterFontWithCommandStream(output, token.Text, out pushedFont);
output.WritePushFont(new TextLayoutFontCommand(pushedFontIndex));
state.AdvanceLineToNextCommand();
PushFont(pushedFont);
index++;
}
/// <summary>
/// Processes a parser token with type <see cref="TextParserTokenType.Text"/>.
/// </summary>
private Boolean ProcessTextToken(TextParserTokenStream input, TextLayoutCommandStream output, SpriteFontFace currentFontFace,
ref TextParserToken token, ref LayoutState state, ref TextLayoutSettings settings, ref Int32 index)
{
if (token.IsNewLine)
{
state.AdvanceLayoutToNextLineWithBreak(output, token.SourceLength, ref settings);
index++;
}
else
{
if (!AccumulateText(input, output, currentFontFace, ref index, ref state, ref settings))
{
return(false);
}
}
return(true);
}
/// <summary>
/// Processes a parser token with type <see cref="TextParserTokenType.Icon"/>.
/// </summary>
private Boolean ProcessIconToken(TextLayoutCommandStream output,
ref TextParserToken token, ref LayoutState state, ref TextLayoutSettings settings, ref Int32 index)
{
var icon = default(TextIconInfo);
var iconIndex = RegisterIconWithCommandStream(output, token.Text, out icon);
var iconSize = MeasureToken(null, token.TokenType, token.Text);
if (state.PositionX + iconSize.Width > (settings.Width ?? Int32.MaxValue))
{
state.AdvanceLayoutToNextLine(output, ref settings);
}
if (state.PositionY + iconSize.Height > (settings.Height ?? Int32.MaxValue))
{
return(false);
}
output.WriteIcon(new TextLayoutIconCommand(iconIndex, state.PositionX, state.PositionY, (Int16)iconSize.Width, (Int16)iconSize.Height));
state.AdvanceLineToNextCommand(iconSize.Width, iconSize.Height, 1, 1);
index++;
return(true);
}
/// <summary>
/// Adds an item to the token stream.
/// </summary>
/// <param name="item">The item to add to the token stream.</param>
internal void Add(TextParserToken item)
{
tokens.Add(item);
}
/// <summary>
/// Processes a parser token with type <see cref="TextParserTokenType.Icon"/>.
/// </summary>
private Boolean ProcessIconToken(TextLayoutCommandStream output,
ref TextParserToken token, ref LayoutState state, ref TextLayoutSettings settings, ref Int32 index)
{
var icon = default(TextIconInfo);
var iconIndex = RegisterIconWithCommandStream(output, token.Text, out icon);
var iconSize = MeasureToken(null, token.TokenType, token.Text);
if (state.PositionX + iconSize.Width > (settings.Width ?? Int32.MaxValue))
state.AdvanceLayoutToNextLine(output, ref settings);
if (state.PositionY + iconSize.Height > (settings.Height ?? Int32.MaxValue))
return false;
output.WriteIcon(new TextLayoutIconCommand(iconIndex, state.PositionX, state.PositionY, (Int16)iconSize.Width, (Int16)iconSize.Height));
state.AdvanceLineToNextCommand(iconSize.Width, iconSize.Height, 1, 1);
index++;
return true;
}
/// <summary>
/// Processes a parser token with type <see cref="TextParserTokenType.PushLink"/>.
/// </summary>
private void ProcessPushLinkToken(TextLayoutCommandStream output,
ref TextParserToken token, ref LayoutState state, ref Int32 index)
{
var pushedLinkTargetIndex = RegisterLinkTargetWithCommandStream(output, token.Text);
output.WritePushLink(new TextLayoutLinkCommand(pushedLinkTargetIndex));
state.AdvanceLineToNextCommand();
index++;
}
/// <summary>
/// Processes a parser token with type <see cref="TextParserTokenType.PopStyle"/>.
/// </summary>
private void ProcessPopStyleToken(TextLayoutCommandStream output, ref Boolean bold, ref Boolean italic,
ref TextParserToken token, ref LayoutState state, ref Int32 index)
{
output.WritePopStyle();
state.AdvanceLineToNextCommand();
PopStyle(ref bold, ref italic);
index++;
}
/// <summary>
/// Processes a parser token with type <see cref="TextParserTokenType.PushGlyphShader"/>.
/// </summary>
private void ProcessPushGlyphShaderToken(TextLayoutCommandStream output,
ref TextParserToken token, ref LayoutState state, ref Int32 index)
{
var pushedGlyphShader = default(GlyphShader);
var pushedGlyphShaderIndex = RegisterGlyphShaderWithCommandStream(output, token.Text, out pushedGlyphShader);
output.WritePushGlyphShader(new TextLayoutGlyphShaderCommand(pushedGlyphShaderIndex));
state.AdvanceLineToNextCommand();
index++;
}
/// <summary>
/// Processes a parser token with type <see cref="TextParserTokenType.PushStyle"/>.
/// </summary>
private void ProcessPushStyleToken(TextLayoutCommandStream output, ref Boolean bold, ref Boolean italic,
ref TextParserToken token, ref LayoutState state, ref Int32 index)
{
var pushedStyle = default(TextStyle);
var pushedStyleIndex = RegisterStyleWithCommandStream(output, token.Text, out pushedStyle);
output.WritePushStyle(new TextLayoutStyleCommand(pushedStyleIndex));
state.AdvanceLineToNextCommand();
PushStyle(pushedStyle, ref bold, ref italic);
index++;
}
/// <summary>
/// Processes a parser token with type <see cref="TextParserTokenType.PushColor"/>.
/// </summary>
private void ProcessPushColorToken(TextLayoutCommandStream output,
ref TextParserToken token, ref LayoutState state, ref Int32 index)
{
var pushedColor = ParseColor(token.Text);
output.WritePushColor(new TextLayoutColorCommand(pushedColor));
state.AdvanceLineToNextCommand();
index++;
}
/// <summary>
/// Processes a parser token with type <see cref="TextParserTokenType.PushFont"/>.
/// </summary>
private void ProcessPushFontToken(TextLayoutCommandStream output,
ref TextParserToken token, ref LayoutState state, ref Int32 index)
{
var pushedFont = default(SpriteFont);
var pushedFontIndex = RegisterFontWithCommandStream(output, token.Text, out pushedFont);
output.WritePushFont(new TextLayoutFontCommand(pushedFontIndex));
state.AdvanceLineToNextCommand();
PushFont(pushedFont);
index++;
}
/// <summary>
/// Processes a parser token with type <see cref="TextParserTokenType.Custom"/>.
/// </summary>
private void ProcessCustomCommandToken(TextLayoutCommandStream output,
ref TextParserToken token, ref LayoutState state, ref Int32 index)
{
var commandID = (token.TokenType - TextParserTokenType.Custom);
var commandValue = token.Text.IsEmpty ? default(Int32) : StringSegmentConversion.ParseInt32(token.Text);
output.WriteCustomCommand(new TextLayoutCustomCommand(commandID, commandValue));
state.AdvanceLineToNextCommand();
index++;
}
/// <summary>
/// Processes a parser token with type <see cref="TextParserTokenType.PopGlyphShader"/>.
/// </summary>
private void ProcessPopGlyphShaderToken(TextLayoutCommandStream output,
ref TextParserToken token, ref LayoutState state, ref Int32 index)
{
output.WritePopGlyphShader();
state.AdvanceLineToNextCommand();
index++;
}
/// <summary>
/// Processes a parser token with type <see cref="TextParserTokenType.Text"/>.
/// </summary>
private Boolean ProcessTextToken(TextParserTokenStream input, TextLayoutCommandStream output, SpriteFontFace currentFontFace,
ref TextParserToken token, ref LayoutState state, ref TextLayoutSettings settings, ref Int32 index)
{
if (token.IsNewLine)
{
state.AdvanceLayoutToNextLineWithBreak(output, token.SourceLength, ref settings);
index++;
}
else
{
if (!AccumulateText(input, output, currentFontFace, ref index, ref state, ref settings))
return false;
}
return true;
}
/// <summary>
/// Adds a <see cref="TextLayoutCommandType.ChangeSourceString"/> or <see cref="TextLayoutCommandType.ChangeSourceStringBuilder"/> command to the output
/// stream if it is necessary to do so for the specified parser token.
/// </summary>
private Boolean EmitChangeSourceIfNecessary(TextParserTokenStream input, TextLayoutCommandStream output, ref TextParserToken token)
{
if (!IsSegmentForCurrentSource(token.Text))
{
var isFirstSource = (sourceString == null && sourceStringBuilder == null);
sourceString = token.Text.SourceString;
sourceStringBuilder = token.Text.SourceStringBuilder;
// NOTE: To save memory, we can elide the first change source command if it's just going to change to the input source.
if (!isFirstSource || input.SourceText.SourceString != sourceString || input.SourceText.SourceStringBuilder != sourceStringBuilder)
{
if (sourceString != null)
{
var sourceIndex = output.RegisterSourceString(sourceString);
output.WriteChangeSourceString(new TextLayoutSourceStringCommand(sourceIndex));
}
else
{
var sourceIndex = output.RegisterSourceStringBuilder(sourceStringBuilder);
output.WriteChangeSourceStringBuilder(new TextLayoutSourceStringBuilderCommand(sourceIndex));
}
return true;
}
}
return false;
}
/// <summary>
/// Calculates the size of the specified parser token when rendered according to the current layout state.
/// </summary>
/// <param name="font">The current font face.</param>
/// <param name="tokenType">The type of the current token.</param>
/// <param name="tokenText">The text of the current token.</param>
/// <param name="tokenNext">The next token after the current token, excluding command tokens.</param>
/// <returns>The size of the specified token in pixels.</returns>
private Size2 MeasureToken(SpriteFontFace font, TextParserTokenType tokenType, StringSegment tokenText, TextParserToken? tokenNext = null)
{
switch (tokenType)
{
case TextParserTokenType.Icon:
{
TextIconInfo icon;
if (!registeredIcons.TryGetValue(tokenText, out icon))
throw new InvalidOperationException(UltravioletStrings.UnrecognizedIcon.Format(tokenText));
return new Size2(icon.Width ?? icon.Icon.Controller.Width, icon.Height ?? icon.Icon.Controller.Height);
}
case TextParserTokenType.Text:
{
var size = font.MeasureString(tokenText);
if (tokenNext.HasValue)
{
var tokenNextValue = tokenNext.GetValueOrDefault();
if (tokenNextValue.TokenType == TextParserTokenType.Text && !tokenNextValue.Text.IsEmpty && !tokenNextValue.IsNewLine)
{
var charLast = tokenText[tokenText.Length - 1];
var charNext = tokenNextValue.Text[0];
var kerning = font.Kerning.Get(charLast, charNext);
return new Size2(size.Width + kerning, size.Height);
}
}
return size;
}
}
return Size2.Zero;
}
/// <summary>
/// Adds a <see cref="TextLayoutCommandType.ChangeSourceString"/> or <see cref="TextLayoutCommandType.ChangeSourceStringBuilder"/> command to the output
/// stream if it is necessary to do so for the specified parser token.
/// </summary>
private Boolean EmitChangeSourceIfNecessary(TextParserTokenStream input, TextLayoutCommandStream output, ref TextParserToken token)
{
if (!IsSegmentForCurrentSource(token.Text))
{
var isFirstSource = (sourceString == null && sourceStringBuilder == null);
sourceString = token.Text.SourceString;
sourceStringBuilder = token.Text.SourceStringBuilder;
// NOTE: To save memory, we can elide the first change source command if it's just going to change to the input source.
if (!isFirstSource || input.SourceText.SourceString != sourceString || input.SourceText.SourceStringBuilder != sourceStringBuilder)
{
if (sourceString != null)
{
var sourceIndex = output.RegisterSourceString(sourceString);
output.WriteChangeSourceString(new TextLayoutSourceStringCommand(sourceIndex));
}
else
{
var sourceIndex = output.RegisterSourceStringBuilder(sourceStringBuilder);
output.WriteChangeSourceStringBuilder(new TextLayoutSourceStringBuilderCommand(sourceIndex));
}
return(true);
}
}
return(false);
}
/// <summary>
/// Adds an item to the token stream.
/// </summary>
/// <param name="item">The item to add to the token stream.</param>
internal void Add(TextParserToken item)
{
tokens.Add(item);
}
