/// <summary>
/// Simple parsing to check if input fragment is well-formed,
/// HTML elements that do not required end tags (i.e. <BR>)
/// will be ignored by this parser.
/// </summary>
/// <param name="text">
/// text being parsed
/// </param>
internal static bool IsWellFormed(String text)
{
int textPos = 0;
TagStack stack = new TagStack();
StringBuilder builder = new StringBuilder();
for (;;)
{
Match match = null;
// 1: scan for text up to the next tag.
if ((match = _textRegex.Match(text, textPos)).Success)
{
textPos = match.Index + match.Length;
}
// we might be done now
if (textPos == text.Length)
{
while (!stack.IsEmpty())
{
if (!IsEndTagOptional(stack.Pop()))
{
return(false);
}
}
return(true);
}
// First check if it's a unclosed tag (i.e. <mobile:Form >)
if ((match = _unclosedTagRegex.Match(text, textPos)).Success)
{
String startTag = match.Groups["tagname"].Value;
stack.Push(startTag);
}
// Check to see if it's a tag
else if ((match = _tagRegex.Match(text, textPos)).Success)
{
// skip
}
// Check to see if it's an end tag
else if ((match = _endtagRegex.Match(text, textPos)).Success)
{
String endTag = match.Groups["tagname"].Value;
bool matched = false;
while (!stack.IsEmpty())
{
String startTag = stack.Pop();
if (String.Compare(endTag, startTag, true /*ignoreCase*/, CultureInfo.InvariantCulture) != 0)
{
if (IsEndTagOptional(startTag))
{
continue;
}
// no match against start tag that requires an end tag
return(false);
}
// we found a match here.
matched = true;
break;
}
if (!matched && stack.IsEmpty())
{
return(false);
}
}
// Check to see if it's a directive (i.e. <%@ %> block)
else if ((match = _directiveRegex.Match(text, textPos)).Success)
{
// skip
}
// Check to see if it's a server side include
// e.g. <!-- #include file="foo.inc" -->
else if ((match = _includeRegex.Match(text, textPos)).Success)
{
// skip it
}
// Check to see if it's a comment (<%-- --%> block
// e.g. <!-- Blah! -->
else if ((match = _commentRegex.Match(text, textPos)).Success)
{
// skip
}
// Check to see if it's an asp expression block (i.e. <%= %> block)
else if ((match = _aspExprRegex.Match(text, textPos)).Success)
{
// skip
}
// Check to see if it's a databinding expression block (i.e. <%# %> block)
// This does not include <%# %> blocks used as values for
// attributes of server tags.
else if ((match = _databindExprRegex.Match(text, textPos)).Success)
{
// skip
}
// Check to see if it's an asp code block
else if ((match = _aspCodeRegex.Match(text, textPos)).Success)
{
// skip
}
// Did we process the block that started with a '<'?
if (match == null || !match.Success)
{
// Skip the '<'
textPos++;
}
else
{
textPos = match.Index + match.Length;
}
// we might be done now
if (textPos == text.Length)
{
while (!stack.IsEmpty())
{
if (!IsEndTagOptional(stack.Pop()))
{
return(false);
}
}
return(true);
}
}
}
/// <summary>
/// Simple parsing to check if input fragment is well-formed,
/// HTML elements that do not required end tags (i.e. <BR>)
/// will be ignored by this parser.
/// </summary>
/// <param name="text">
/// text being parsed
/// </param>
internal static bool IsWellFormed(String text)
{
int textPos = 0;
TagStack stack = new TagStack();
for (;;)
{
Match match = null;
// 1: scan for text up to the next tag.
if ((match = _textRegex.Match(text, textPos)).Success)
{
textPos = match.Index + match.Length;
}
// we might be done now
if (textPos == text.Length)
{
while (!stack.IsEmpty())
{
if (!IsEndTagOptional(stack.Pop()))
{
return false;
}
}
return true;
}
// First check if it's a unclosed tag (i.e. <mobile:Form >)
if ((match = _unclosedTagRegex.Match(text, textPos)).Success)
{
String startTag = match.Groups["tagname"].Value;
stack.Push(startTag);
}
// Check to see if it's a tag
else if ((match = _tagRegex.Match(text, textPos)).Success)
{
// skip
}
// Check to see if it's an end tag
else if ((match = _endtagRegex.Match(text, textPos)).Success)
{
String endTag = match.Groups["tagname"].Value;
bool matched = false;
while (!stack.IsEmpty())
{
String startTag = stack.Pop();
if (String.Compare(endTag, startTag, StringComparison.OrdinalIgnoreCase) != 0)
{
if (IsEndTagOptional(startTag))
{
continue;
}
// no match against start tag that requires an end tag
return false;
}
// we found a match here.
matched = true;
break;
}
if (!matched && stack.IsEmpty())
{
return false;
}
}
// Check to see if it's a directive (i.e. <%@ %> block)
else if ((match = _directiveRegex.Match(text, textPos)).Success)
{
// skip
}
// Check to see if it's a server side include
// e.g. <!-- #include file="foo.inc" -->
else if ((match = _includeRegex.Match(text, textPos)).Success)
{
// skip it
}
// Check to see if it's a comment (<%-- --%> block
// e.g. <!-- Blah! -->
else if ((match = _commentRegex.Match(text, textPos)).Success)
{
// skip
}
// Check to see if it's an asp expression block (i.e. <%= %> block)
else if ((match = _aspExprRegex.Match(text, textPos)).Success)
{
// skip
}
// Check to see if it's a databinding expression block (i.e. <%# %> block)
// This does not include <%# %> blocks used as values for
// attributes of server tags.
else if ((match = _databindExprRegex.Match(text, textPos)).Success)
{
// skip
}
// Check to see if it's an asp code block
else if ((match = _aspCodeRegex.Match(text, textPos)).Success)
{
// skip
}
// Did we process the block that started with a '<'?
if (match == null || !match.Success)
{
// Skip the '<'
textPos++;
}
else
{
textPos = match.Index + match.Length;
}
// we might be done now
if (textPos == text.Length)
{
while (!stack.IsEmpty())
{
if (!IsEndTagOptional(stack.Pop()))
{
return false;
}
}
return true;
}
}
}