/// <summary>
/// Reads an attribute value and returns it.
/// </summary>
private string _readAttributeValue()
{
char quote = m_str[m_pos];
if (quote != '"' && quote != '\'')
{
throw _error(ErrorCode.XML_PARSER_ELEMENT_MALFORMED);
}
m_pos++;
ReadOnlySpan <char> span = m_str.AsSpan(m_pos);
int charsLeft = m_str.Length - m_pos;
char newline = s_newLineChar;
ReadOnlySpan <char> searchChars = stackalloc char[] { quote, '&', '<', newline };
bool mayHaveEntities = false;
while (true)
{
int index = span.IndexOfAny(searchChars);
if (index == -1)
{
throw _error(ErrorCode.XML_PARSER_UNTERMINATED_ATTR);
}
char charAtIndex = span[index];
if (charAtIndex == quote)
{
span = span.Slice(index);
break;
}
else if (charAtIndex == '&')
{
span = span.Slice(index);
mayHaveEntities = true;
break;
}
else if (charAtIndex == newline)
{
m_curLine++;
span = span.Slice(index + 1);
}
else
{
// Attributes cannot contain '<'.
throw _error(ErrorCode.XML_PARSER_ELEMENT_MALFORMED);
}
}
int charsRead = charsLeft - span.Length;
if (!mayHaveEntities)
{
int startPos = m_pos;
m_pos += charsRead + 1; // +1 for the closing quote
return(m_str.Substring(startPos, charsRead));
}
char[] textBuffer = m_buffer;
if (textBuffer.Length < charsRead)
{
DataStructureUtil.resizeArray(ref textBuffer, textBuffer.Length, charsRead);
}
m_str.CopyTo(m_pos, textBuffer, 0, charsRead);
m_pos += charsRead;
int textBufPos = charsRead;
while (true)
{
char ch = m_str[m_pos];
if (ch == '&')
{
int entityCode = _readEntity();
_writeCodePoint(ref textBuffer, ref textBufPos, entityCode);
}
else if (ch == quote)
{
break;
}
else if (ch == '<')
{
throw _error(ErrorCode.XML_PARSER_ELEMENT_MALFORMED);
}
else if (ch == newline)
{
m_curLine++;
m_pos++;
}
span = m_str.AsSpan(m_pos);
int nextIndex = span.IndexOfAny(searchChars);
if (nextIndex == -1)
{
throw _error(ErrorCode.XML_PARSER_UNTERMINATED_ATTR);
}
if (textBuffer.Length - textBufPos < nextIndex)
{
DataStructureUtil.resizeArray(ref textBuffer, textBufPos, textBufPos + nextIndex);
}
span.Slice(0, nextIndex).CopyTo(textBuffer.AsSpan(textBufPos));
textBufPos += nextIndex;
m_pos += nextIndex;
}
m_pos++; // For closing quote
m_buffer = textBuffer;
return((textBufPos == 0) ? "" : new string(textBuffer, 0, textBufPos));
}
/// <summary>
/// Reads a text node and adds it as a child to the element currently being processed.
/// </summary>
private void _readText()
{
ReadOnlySpan <char> span = m_str.AsSpan(m_pos);
int charsLeft = m_str.Length - m_pos;
char newline = s_newLineChar;
ReadOnlySpan <char> searchChars = stackalloc char[3] {
'<', '&', newline
};
bool mayHaveEntities = false;
while (!span.IsEmpty)
{
int index = span.IndexOfAny(searchChars);
char charAtIndex = (index == -1) ? '\0' : span[index];
if (charAtIndex == '<')
{
span = span.Slice(index);
break;
}
else if (charAtIndex == '&')
{
span = span.Slice(index);
mayHaveEntities = true;
break;
}
else if (charAtIndex == newline)
{
m_curLine++;
span = span.Slice(index + 1);
}
else
{
span = default;
}
}
int charsRead = charsLeft - span.Length;
string text;
if (!mayHaveEntities)
{
text = ((m_parserFlags & FLAG_IGNORE_SPACE) != 0)
? XMLHelper.stripWhitespace(m_str, m_pos, charsRead)
: m_str.Substring(m_pos, charsRead);
if (text.Length != 0)
{
m_nodeStack.add(ASXML.createTextNode(text));
}
m_pos += charsRead;
return;
}
char[] textBuffer = m_buffer;
if (charsRead > textBuffer.Length)
{
DataStructureUtil.resizeArray(ref textBuffer, textBuffer.Length, charsRead);
}
m_str.CopyTo(m_pos, textBuffer, 0, charsRead);
int textBufPos = charsRead;
m_pos += charsRead;
while (true)
{
char ch = m_str[m_pos];
if (ch == '&')
{
int entityCode = _readEntity();
_writeCodePoint(ref textBuffer, ref textBufPos, entityCode);
}
else if (ch == '<')
{
break;
}
else if (ch == newline)
{
m_curLine++;
m_pos++;
}
span = m_str.AsSpan(m_pos);
int nextIndex = span.IndexOfAny(searchChars);
int charsToCopy = (nextIndex == -1) ? span.Length : nextIndex;
if (textBuffer.Length - textBufPos < charsToCopy)
{
DataStructureUtil.resizeArray(ref textBuffer, textBufPos, textBufPos + charsToCopy);
}
span.Slice(0, charsToCopy).CopyTo(textBuffer.AsSpan(textBufPos));
textBufPos += charsToCopy;
m_pos += charsToCopy;
if (nextIndex == -1)
{
break;
}
}
m_buffer = textBuffer;
if (textBufPos == 0)
{
return;
}
text = ((m_parserFlags & FLAG_IGNORE_SPACE) != 0)
? XMLHelper.stripWhitespace(textBuffer, 0, textBufPos)
: new string(textBuffer, 0, textBufPos);
if (text.Length != 0)
{
m_nodeStack.add(ASXML.createTextNode(text));
}
}
