public static Paragraph Parse(string text, Style?style = null)
{
if (text is null)
{
throw new ArgumentNullException(nameof(text));
}
style ??= Style.Plain;
var result = new Paragraph();
using var tokenizer = new MarkupTokenizer(text);
var stack = new Stack <Style>();
while (tokenizer.MoveNext())
{
var token = tokenizer.Current;
if (token == null)
{
break;
}
if (token.Kind == MarkupTokenKind.Open)
{
var parsedStyle = StyleParser.Parse(token.Value);
stack.Push(parsedStyle);
}
else if (token.Kind == MarkupTokenKind.Close)
{
if (stack.Count == 0)
{
throw new InvalidOperationException($"Encountered closing tag when none was expected near position {token.Position}.");
}
stack.Pop();
}
else if (token.Kind == MarkupTokenKind.Text)
{
// Get the effective style.
var effectiveStyle = style.Combine(stack.Reverse());
result.Append(Emoji.Replace(token.Value), effectiveStyle);
}
else
{
throw new InvalidOperationException("Encountered unknown markup token.");
}
}
if (stack.Count > 0)
{
throw new InvalidOperationException("Unbalanced markup stack. Did you forget to close a tag?");
}
return(result);
}
/// <summary>
/// Converts the string representation of a style to its <see cref="Style"/> equivalent.
/// A return value indicates whether the operation succeeded.
/// </summary>
/// <param name="text">A string containing a style to parse.</param>
/// <param name="result">
/// When this method returns, contains the <see cref="Style"/> equivalent of the text contained in <paramref name="text"/>,
/// if the conversion succeeded, or <c>null</c> if the conversion failed.
/// </param>
/// <returns><c>true</c> if s was converted successfully; otherwise, <c>false</c>.</returns>
public static bool TryParse(string text, out Style?result)
{
return(StyleParser.TryParse(text, out result));
}
/// <summary>
/// Converts the string representation of a style to its <see cref="Style"/> equivalent.
/// </summary>
/// <param name="text">A string containing a style to parse.</param>
/// <returns>A <see cref="Style"/> equivalent of the text contained in <paramref name="text"/>.</returns>
public static Style Parse(string text)
{
return(StyleParser.Parse(text));
}
