private static void FormatExpression(IFormattedTextBlock formattedText, IToken token, int blockOffset, string block)
{
ExpressionToken expression = (ExpressionToken)token;
IOperator op = expression.Operator;
if (op is SubstitutionOperator)
FormatItem(VttSection.Substitution, formattedText, blockOffset, block);
else if (op is FunctionOperator)
FormatFunction(formattedText, expression, blockOffset, block);
else
FormatItem(VttSection.Expression, formattedText, blockOffset, block);
}
/// <summary>
/// Highlights the text of the current block.
/// </summary>
/// <param name="formattedText">The text from the current block to highlight</param>
/// <param name="lastBlockState"></param>
/// <returns>The current block code</returns>
public void Highlight(IFormattedTextBlock formattedText, BlockState lastBlockState)
{
Initialise();
bool inComment = lastBlockState == BlockState.InComment;
string text = formattedText.Text;
int offset = 0;
string[] lines = text.Split('\n');
foreach (string line in lines)
{
inComment = FormatLine(formattedText, line, offset, inComment);
offset += line.Length + 1;
}
formattedText.State = inComment ? BlockState.InComment : BlockState.Normal;
}
private static void FormatFunction(IFormattedTextBlock formattedText, ExpressionToken token, int blockOffset, string block)
{
if (token.First is StringToken)
{
string name = token.First.Text;
int index = block.IndexOf(name);
index = block.IndexOf(':', index + name.Length);
FormatItem(VttSection.Function, formattedText, blockOffset, block.Substring(0, index + 1));
FormatToken(formattedText, token.Second, blockOffset + index + 1, block.Substring(index + 1));
}
else
{
FormatItem(VttSection.Function, formattedText, blockOffset, block);
}
}
private static void FormatItem(VttSection section, IFormattedTextBlock formattedText, int blockOffset, string block)
{
VttTextOptions options;
if (blockOffset + block.Length <= formattedText.Text.Length && s_options.TryGetValue(section, out options))
{
int length = block.Length;
if (options.Colour != null)
formattedText.SetForegroundBrush(options.Colour, blockOffset, length);
if (options.Decorations != null)
formattedText.SetTextDecorations(options.Decorations, blockOffset, length);
if (options.Family != null)
formattedText.SetFontFamily(options.Family, blockOffset, length);
if (options.Size > 0)
formattedText.SetFontSize(options.Size, blockOffset, length);
if (options.Stretch != FontStretches.Medium)
formattedText.SetFontStretch(options.Stretch, blockOffset, length);
if (options.Style != FontStyles.Normal)
formattedText.SetFontStyle(options.Style, blockOffset, length);
if (options.Weight != FontWeights.Normal)
formattedText.SetFontWeight(options.Weight, blockOffset, length);
}
}
private static void FormatValue(IFormattedTextBlock formattedText, string text, int offset)
{
try
{
List<FormattedToken> formattedTokens = new List<FormattedToken>();
IToken token = TokenGenerator.Parse(text, offset, (x, y, z) => StoreFormattedToken(formattedTokens, x, y, z));
FormatToken(formattedText, token, offset, text);
foreach (FormattedToken formattedToken in formattedTokens)
FormatToken(formattedText, formattedToken.Token, formattedToken.Offset, formattedToken.Text);
}
catch (Exception)
{
FormatItem(VttSection.Error, formattedText, offset, text);
}
}
private static void FormatToken(IFormattedTextBlock formattedText, IToken token, int blockOffset, string block)
{
if (token is StringToken)
FormatItem(VttSection.String, formattedText, blockOffset, block);
else if (token is IntToken)
FormatItem(VttSection.Integer, formattedText, blockOffset, block);
else if (token is BoolTooken)
FormatItem(VttSection.Boolean, formattedText, blockOffset, block);
else if (token is DoubleToken)
FormatItem(VttSection.Double, formattedText, blockOffset, block);
else if (token is ExpressionToken)
FormatExpression(formattedText, token, blockOffset, block);
else
FormatItem(VttSection.Default, formattedText, blockOffset, block);
}
private static bool FormatLine(IFormattedTextBlock formattedText, string line, int offset, bool inComment)
{
string trimmed = line.TrimEnd('\r', ' ', '\t');
if (trimmed.Length > 0)
{
int length = trimmed.Length;
trimmed = trimmed.TrimStart();
if (line.TrimStart().StartsWith("//"))
{
FormatItem(VttSection.Comment, formattedText, offset, line);
}
else if (line.StartsWith("/*"))
{
FormatItem(VttSection.Comment, formattedText, offset, line);
inComment = true;
}
else if (inComment)
{
FormatItem(VttSection.Comment, formattedText, offset, line);
inComment = !trimmed.EndsWith("*/");
}
else
{
offset += length - trimmed.Length;
string[] parts = trimmed.Split(new[] {':'}, 2);
FormatItem(VttSection.Key, formattedText, offset, parts[0]);
offset += parts[0].Length;
FormatItem(VttSection.Separator, formattedText, offset, ":");
if (parts.Length == 2 && parts[1].Length > 0)
FormatValue(formattedText, parts[1], offset + 1);
}
}
return inComment;
}
