/// <summary>
/// Utility method to write style block into a buffer.
/// </summary>
/// <param name="style">Style block to write.</param>
/// <param name="builder">String builder buffer to write into.</param>
private static void WrteStyle(
Style style,
StringBuilder builder)
{
if (false == string.IsNullOrWhiteSpace(style.RawContent))
{
if (style.RawContent.Contains(Constants.ArrowToken))
{
throw new ArgumentException(string.Format("Style cannot contain '{0}'.", Constants.ArrowToken));
}
builder.AppendLine();
builder.Append(Constants.StyleToken);
if (style.RawContent.IndexOfAny(WebVttSerializer.newLine) >= 0)
{
builder.AppendLine();
WebVttSerializer.WriteString(style.RawContent.TrimEnd(WebVttSerializer.newLine), false, builder);
}
else
{
builder.Append(" ");
builder.Append(style.RawContent);
}
builder.AppendLine();
}
}
/// <summary>
/// Utility method to write region definition block into a buffer.
/// </summary>
/// <param name="region">Region definition to write.</param>
/// <param name="builder">String builder buffer to write into.</param>
private static void WriteRegion(
RegionDefinition region,
StringBuilder builder)
{
builder.AppendLine();
builder.AppendLine(Constants.RegionToken);
if (false == string.IsNullOrWhiteSpace(region.Id))
{
builder.Append(Constants.RegionIdName).Append(":");
WebVttSerializer.WriteString(region.Id, true, builder);
builder.AppendLine();
}
if (region.Lines.HasValue &&
region.Lines.Value >= 0)
{
builder.Append(Constants.LinesName).Append(":").AppendLine(region.Lines.Value.ToString());
}
if (region.WidthPercent.HasValue)
{
builder
.Append(Constants.WidthName)
.Append(":")
.AppendLine(WebVttSerializer.GetPercentValue(region.WidthPercent.Value));
}
if (region.RegionAnchor.HasValue)
{
builder
.Append(Constants.RegionAnchorName).Append(":")
.Append(WebVttSerializer.GetPercentValue(region.RegionAnchor.Value.XPercent))
.Append(',')
.AppendLine(WebVttSerializer.GetPercentValue(region.RegionAnchor.Value.YPercent));
}
if (region.ViewPortAnchor.HasValue)
{
builder
.Append(Constants.ViewPortAnchorName).Append(":")
.Append(WebVttSerializer.GetPercentValue(region.ViewPortAnchor.Value.XPercent))
.Append(',')
.AppendLine(WebVttSerializer.GetPercentValue(region.ViewPortAnchor.Value.YPercent));
}
if (region.Scroll.HasValue && region.Scroll.Value)
{
builder.Append(Constants.ScrollName).Append(':').AppendLine(Constants.ScrollUpValue);
}
}
/// <summary>
/// Utility method to write a single cue span into a buffer.
/// </summary>
/// <param name="span">Cue span to write.</param>
/// <param name="builder">String builder buffer to write into.</param>
private static void WriteSpan(
Span span,
StringBuilder builder)
{
if (span.Type == SpanType.Text)
{
if (string.IsNullOrEmpty(span.Text))
{
return;
}
if (span.Text.Contains(Constants.ArrowToken))
{
throw new ArgumentException("Cue text cannot contain '{0}'.", Constants.ArrowToken);
}
WebVttSerializer.WriteString(span.Text, true, builder);
return;
}
string tagName = WebVttSerializer.GetSpanTagName(span.Type);
builder.Append('<').Append(tagName);
if (span.Classes != null && span.Classes.Length > 0)
{
foreach (string cls in span.Classes)
{
if (false == string.IsNullOrWhiteSpace(cls))
{
if (WebVttSerializer.HasWhiteSpace(cls))
{
throw new ArgumentException("White space characters are not allowed in span class name.");
}
builder.Append('.').Append(cls);
}
}
}
if (false == string.IsNullOrWhiteSpace(span.Annotation))
{
builder.Append(' ');
WebVttSerializer.WriteString(span.Annotation, true, builder);
}
builder.Append('>');
if (span.Children != null && span.Children.Length > 0)
{
foreach (var child in span.Children)
{
if (child != null)
{
WebVttSerializer.WriteSpan(child, builder);
}
}
}
builder.Append("</").Append(tagName).Append('>');
}