/// <summary>
/// Parses a header that starts with a hash.
/// </summary>
/// <param name="markdown"> The markdown text. </param>
/// <param name="start"> The location of the first hash character. </param>
/// <param name="end"> The location of the end of the line. </param>
/// <returns> A parsed header block, or <c>null</c> if this is not a header. </returns>
internal static HeaderBlock ParseHashPrefixedHeader(string markdown, int start, int end)
{
// This type of header starts with one or more '#' characters, followed by the header
// text, optionally followed by any number of hash characters.
var result = new HeaderBlock();
// Figure out how many consecutive hash characters there are.
int pos = start;
while (pos < end && markdown[pos] == '#' && pos - start < 6)
{
pos++;
}
result.HeaderLevel = pos - start;
if (result.HeaderLevel == 0)
{
return(null);
}
// Ignore any hashes at the end of the line.
while (pos < end && markdown[end - 1] == '#')
{
end--;
}
// Parse the inline content.
result.Inlines = Common.ParseInlineChildren(markdown, pos, end);
return(result);
}
/// <summary>
/// Parses a two-line header.
/// </summary>
/// <param name="markdown"> The markdown text. </param>
/// <param name="firstLineStart"> The location of the start of the first line. </param>
/// <param name="firstLineEnd"> The location of the end of the first line. </param>
/// <param name="secondLineStart"> The location of the start of the second line. </param>
/// <param name="secondLineEnd"> The location of the end of the second line. </param>
/// <returns> A parsed header block, or <c>null</c> if this is not a header. </returns>
internal static HeaderBlock ParseUnderlineStyleHeader(string markdown, int firstLineStart, int firstLineEnd, int secondLineStart, int secondLineEnd)
{
// This type of header starts with some text on the first line, followed by one or more
// underline characters ('=' or '-') on the second line.
// The second line can have whitespace after the underline characters, but not before
// or between each character.
// Check the second line is valid.
if (secondLineEnd <= secondLineStart)
{
return(null);
}
// Figure out what the underline character is ('=' or '-').
char underlineChar = markdown[secondLineStart];
if (underlineChar != '=' && underlineChar != '-')
{
return(null);
}
// Read past consecutive underline characters.
int pos = secondLineStart + 1;
for (; pos < secondLineEnd; pos++)
{
char c = markdown[pos];
if (c != underlineChar)
{
break;
}
pos++;
}
// The rest of the line must be whitespace.
for (; pos < secondLineEnd; pos++)
{
char c = markdown[pos];
if (c != ' ' && c != '\t')
{
return(null);
}
pos++;
}
var result = new HeaderBlock();
result.HeaderLevel = underlineChar == '=' ? 1 : 2;
// Parse the inline content.
result.Inlines = Common.ParseInlineChildren(markdown, firstLineStart, firstLineEnd);
return(result);
}
/// <summary>
/// Parses a header that starts with a hash.
/// </summary>
/// <param name="markdown"> The markdown text. </param>
/// <param name="start"> The location of the first hash character. </param>
/// <param name="end"> The location of the end of the line. </param>
/// <returns> A parsed header block, or <c>null</c> if this is not a header. </returns>
internal static HeaderBlock ParseHashPrefixedHeader(string markdown, int start, int end)
{
// This type of header starts with one or more '#' characters, followed by the header
// text, optionally followed by any number of hash characters.
var result = new HeaderBlock();
// Figure out how many consecutive hash characters there are.
int pos = start;
while (pos < end && markdown[pos] == '#' && pos - start < 6)
pos++;
result.HeaderLevel = pos - start;
if (result.HeaderLevel == 0)
return null;
// Ignore any hashes at the end of the line.
while (pos < end && markdown[end - 1] == '#')
end--;
// Parse the inline content.
result.Inlines = Common.ParseInlineChildren(markdown, pos, end);
return result;
}
/// <summary>
/// Parses a two-line header.
/// </summary>
/// <param name="markdown"> The markdown text. </param>
/// <param name="firstLineStart"> The location of the start of the first line. </param>
/// <param name="firstLineEnd"> The location of the end of the first line. </param>
/// <param name="secondLineStart"> The location of the start of the second line. </param>
/// <param name="secondLineEnd"> The location of the end of the second line. </param>
/// <returns> A parsed header block, or <c>null</c> if this is not a header. </returns>
internal static HeaderBlock ParseUnderlineStyleHeader(string markdown, int firstLineStart, int firstLineEnd, int secondLineStart, int secondLineEnd)
{
// This type of header starts with some text on the first line, followed by one or more
// underline characters ('=' or '-') on the second line.
// The second line can have whitespace after the underline characters, but not before
// or between each character.
// Check the second line is valid.
if (secondLineEnd <= secondLineStart)
return null;
// Figure out what the underline character is ('=' or '-').
char underlineChar = markdown[secondLineStart];
if (underlineChar != '=' && underlineChar != '-')
return null;
// Read past consecutive underline characters.
int pos = secondLineStart + 1;
for (; pos < secondLineEnd; pos++)
{
char c = markdown[pos];
if (c != underlineChar)
break;
pos++;
}
// The rest of the line must be whitespace.
for (; pos < secondLineEnd; pos++)
{
char c = markdown[pos];
if (c != ' ' && c != '\t')
return null;
pos++;
}
var result = new HeaderBlock();
result.HeaderLevel = underlineChar == '=' ? 1 : 2;
// Parse the inline content.
result.Inlines = Common.ParseInlineChildren(markdown, firstLineStart, firstLineEnd);
return result;
}
/// <summary>
/// Renders a header element.
/// </summary>
/// <param name="element"></param>
/// <param name="blockUIElementCollection"></param>
/// <param name="context"></param>
private void RenderHeader(HeaderBlock element, UIElementCollection blockUIElementCollection, RenderContext context)
{
var textBlock = CreateOrReuseRichTextBlock(blockUIElementCollection, context);
var paragraph = new Paragraph();
var childInlines = paragraph.Inlines;
switch (element.HeaderLevel)
{
case 1:
paragraph.Margin = Header1Margin;
paragraph.FontSize = Header1FontSize;
paragraph.FontWeight = Header1FontWeight;
break;
case 2:
paragraph.Margin = Header2Margin;
paragraph.FontSize = Header2FontSize;
paragraph.FontWeight = Header2FontWeight;
break;
case 3:
paragraph.Margin = Header3Margin;
paragraph.FontSize = Header3FontSize;
paragraph.FontWeight = Header3FontWeight;
break;
case 4:
paragraph.Margin = Header4Margin;
paragraph.FontSize = Header4FontSize;
paragraph.FontWeight = Header4FontWeight;
break;
case 5:
paragraph.Margin = Header5Margin;
paragraph.FontSize = Header5FontSize;
paragraph.FontWeight = Header5FontWeight;
break;
case 6:
paragraph.Margin = Header6Margin;
paragraph.FontSize = Header6FontSize;
paragraph.FontWeight = Header6FontWeight;
var underline = new Underline();
childInlines = underline.Inlines;
paragraph.Inlines.Add(underline);
break;
}
// Render the children into the para inline.
context.TrimLeadingWhitespace = true;
RenderInlineChildren(childInlines, element.Inlines, paragraph, context);
// Add it to the blocks
textBlock.Blocks.Add(paragraph);
}
/// <summary>
/// Renders a header element.
/// </summary>
/// <param name="element"></param>
/// <param name="currentBlocks"></param>
private void RenderHeader(HeaderBlock element, BlockCollection currentBlocks)
{
// Make the new header paragraph
Paragraph headerPara = new Paragraph();
headerPara.Margin = new Thickness(0, 18, 0, 12);
// Set the style
switch (element.HeaderLevel)
{
case 1:
headerPara.FontSize = 20;
headerPara.FontWeight = FontWeights.Bold;
break;
case 2:
headerPara.FontSize = 20;
break;
case 3:
headerPara.FontSize = 17;
headerPara.FontWeight = FontWeights.Bold;
break;
case 4:
headerPara.FontSize = 17;
break;
case 5:
default:
headerPara.FontWeight = FontWeights.Bold;
break;
}
// Add it to the blocks
currentBlocks.Add(headerPara);
// Render the children into the para inline.
bool trimTextStart = true;
RenderInlineChildren(element, headerPara.Inlines, ref trimTextStart);
}