// Extension method. Skip an escapable character, or one normal character
public static void SkipEscapableChar(this StringScanner p, bool ExtraMode)
{
if (p.current == '\\' && IsEscapableChar(p.CharAtOffset(1), ExtraMode))
{
p.SkipForward(2);
}
else
{
p.SkipForward(1);
}
}
public static string NormalizeLineEnds(string str)
{
if (str.IndexOfAny(lineends) < 0)
{
return(str);
}
StringBuilder sb = new StringBuilder();
StringScanner sp = new StringScanner(str);
while (!sp.eof)
{
if (sp.eol)
{
sb.Append('\n');
sp.SkipEol();
}
else
{
sb.Append(sp.current);
sp.SkipForward(1);
}
}
return(sb.ToString());
}
/// <summary>
/// Parses the link target.
/// For reference link definition, this is the bit after "[id]: thisbit"
/// For inline link, this is the bit in the parens: [link text](thisbit)
/// </summary>
/// <param name="p">The p.</param>
/// <param name="id">The identifier.</param>
/// <param name="ExtraMode">if set to <c>true</c> [extra mode].</param>
/// <returns>LinkDefinition.</returns>
internal static LinkDefinition ParseLinkTarget(StringScanner p, string id, bool ExtraMode)
{
// Skip whitespace
p.SkipWhitespace();
// End of string?
if (p.eol)
{
return(null);
}
// Create the link definition
var r = new LinkDefinition(id);
// Is the url enclosed in angle brackets
if (p.SkipChar('<'))
{
// Extract the url
p.Mark();
// Find end of the url
while (p.current != '>')
{
if (p.eof)
{
return(null);
}
p.SkipEscapableChar(ExtraMode);
}
string url = p.Extract();
if (!p.SkipChar('>'))
{
return(null);
}
// Unescape it
r.url = Utils.UnescapeString(url.Trim(), ExtraMode);
// Skip whitespace
p.SkipWhitespace();
}
else
{
// Find end of the url
p.Mark();
int paren_depth = 1;
while (!p.eol)
{
char ch = p.current;
if (char.IsWhiteSpace(ch))
{
break;
}
if (id == null)
{
if (ch == '(')
{
paren_depth++;
}
else if (ch == ')')
{
paren_depth--;
if (paren_depth == 0)
{
break;
}
}
}
p.SkipEscapableChar(ExtraMode);
}
r.url = Utils.UnescapeString(p.Extract().Trim(), ExtraMode);
}
p.SkipLinespace();
// End of inline target
if (p.DoesMatch(')'))
{
return(r);
}
bool bOnNewLine = p.eol;
int posLineEnd = p.position;
if (p.eol)
{
p.SkipEol();
p.SkipLinespace();
}
// Work out what the title is delimited with
char delim;
switch (p.current)
{
case '\'':
case '\"':
delim = p.current;
break;
case '(':
delim = ')';
break;
default:
if (bOnNewLine)
{
p.position = posLineEnd;
return(r);
}
else
{
return(null);
}
}
// Skip the opening title delimiter
p.SkipForward(1);
// Find the end of the title
p.Mark();
while (true)
{
if (p.eol)
{
return(null);
}
if (p.current == delim)
{
if (delim != ')')
{
int savepos = p.position;
// Check for embedded quotes in title
// Skip the quote and any trailing whitespace
p.SkipForward(1);
p.SkipLinespace();
// Next we expect either the end of the line for a link definition
// or the close bracket for an inline link
if ((id == null && p.current != ')') ||
(id != null && !p.eol))
{
continue;
}
p.position = savepos;
}
// End of title
break;
}
p.SkipEscapableChar(ExtraMode);
}
// Store the title
r.title = Utils.UnescapeString(p.Extract(), ExtraMode);
// Skip closing quote
p.SkipForward(1);
// Done!
return(r);
}
/// <summary>
/// Parses the helper.
/// </summary>
/// <param name="p">The p.</param>
/// <returns>HtmlTag.</returns>
private static HtmlTag ParseHelper(StringScanner p)
{
// Does it look like a tag?
if (p.current != '<')
{
return(null);
}
// Skip '<'
p.SkipForward(1);
// Is it a comment?
if (p.SkipString("!--"))
{
p.Mark();
if (p.Find("-->"))
{
var t = new HtmlTag("!");
t.m_attributes.Add("content", p.Extract());
t.m_closed = true;
p.SkipForward(3);
return(t);
}
}
// Is it a closing tag eg: </div>
bool bClosing = p.SkipChar('/');
// Get the tag name
string tagName = null;
if (!p.SkipIdentifier(ref tagName))
{
return(null);
}
// Probably a tag, create the HtmlTag object now
HtmlTag tag = new HtmlTag(tagName);
tag.m_closing = bClosing;
// If it's a closing tag, no attributes
if (bClosing)
{
if (p.current != '>')
{
return(null);
}
p.SkipForward(1);
return(tag);
}
while (!p.eof)
{
// Skip whitespace
p.SkipWhitespace();
// Check for closed tag eg: <hr />
if (p.SkipString("/>"))
{
tag.m_closed = true;
return(tag);
}
// End of tag?
if (p.SkipChar('>'))
{
return(tag);
}
// attribute name
string attributeName = null;
if (!p.SkipIdentifier(ref attributeName))
{
return(null);
}
// Skip whitespace
p.SkipWhitespace();
// Skip equal sign
if (p.SkipChar('='))
{
// Skip whitespace
p.SkipWhitespace();
// Optional quotes
if (p.SkipChar('\"'))
{
// Scan the value
p.Mark();
if (!p.Find('\"'))
{
return(null);
}
// Store the value
tag.m_attributes.Add(attributeName, p.Extract());
// Skip closing quote
p.SkipForward(1);
}
else
{
// Scan the value
p.Mark();
while (!p.eof && !char.IsWhiteSpace(p.current) && p.current != '>' && p.current != '/')
{
p.SkipForward(1);
}
if (!p.eof)
{
// Store the value
tag.m_attributes.Add(attributeName, p.Extract());
}
}
}
else
{
tag.m_attributes.Add(attributeName, "");
}
}
return(null);
}
public static TableSpec Parse(StringScanner p)
{
// Leading line space allowed
p.SkipLinespace();
// Quick check for typical case
if (p.current != '|' && p.current != ':' && p.current != '-')
{
return(null);
}
// Don't create the spec until it at least looks like one
TableSpec spec = null;
// Leading bar, looks like a table spec
if (p.SkipChar('|'))
{
spec = new TableSpec();
spec.LeadingBar = true;
}
// Process all columns
while (true)
{
// Parse column spec
p.SkipLinespace();
// Must have something in the spec
if (p.current == '|')
{
return(null);
}
bool AlignLeft = p.SkipChar(':');
while (p.current == '-')
{
p.SkipForward(1);
}
bool AlignRight = p.SkipChar(':');
p.SkipLinespace();
// Work out column alignment
ColumnAlignment col = ColumnAlignment.NA;
if (AlignLeft && AlignRight)
{
col = ColumnAlignment.Center;
}
else if (AlignLeft)
{
col = ColumnAlignment.Left;
}
else if (AlignRight)
{
col = ColumnAlignment.Right;
}
if (p.eol)
{
// Not a spec?
if (spec == null)
{
return(null);
}
// Add the final spec?
spec.Columns.Add(col);
return(spec);
}
// We expect a vertical bar
if (!p.SkipChar('|'))
{
return(null);
}
// Create the table spec
if (spec == null)
{
spec = new TableSpec();
}
// Add the column
spec.Columns.Add(col);
// Check for trailing vertical bar
p.SkipLinespace();
if (p.eol)
{
spec.TrailingBar = true;
return(spec);
}
// Next column
}
}
