visitSymbol method
Implementation
@override
String visitSymbol(SymbolNode node) {
final unicode = node.unicode;
if (unicode.length == 1 &&
RegExp(r'^\p{L}+$', unicode: true).hasMatch(unicode)) {
return "<mi>${_escapeXml(unicode)}</mi>";
} else {
return "<mo>${_escapeXml(unicode)}</mo>";
}
}