private UnicodeCategory validateChar()
{
char c = code[index];
if (c >= 0xD800 && c <= 0xDBFF)
{
// Leading surrogate
char c2 = code[index + 1];
if (c2 >= 0xDC00 && c2 <= 0xDFFF)
{
// Trailing surrogate - ignore for now
}
else
{
reportError("L0007", "Illegal lone surrogate");
}
}
else if (c >= 0xDC00 && c <= 0xDFFF)
{
// Trailing surrogate
reportError("L0007", "Illegal lone surrogate");
}
UnicodeCategory cat = UnicodeLookup.GetUnicodeCategory(code, index);
if (c == '\t')
{
reportError("L0001", "Tab characters are not permitted.");
}
if (cat == UnicodeCategory.ParagraphSeparator ||
cat == UnicodeCategory.SpaceSeparator)
{
if (c != ' ' && c != '\u2028')
{
reportError("L0002", new Dictionary <string, string>()
{
{ "codepoint", formatCodepoint(Char.ConvertToUtf32(code, index)) },
{ "name", UnicodeLookup.GetCodepointName(Char.ConvertToUtf32(code, index)) }
},
"Illegal whitespace.");
}
}
else if ((cat == UnicodeCategory.Control ||
cat == UnicodeCategory.Format ||
cat == UnicodeCategory.Surrogate
) &&
c != '\n' && c != '\r')
{
reportError("L0003", new Dictionary <string, string>()
{
{ "codepoint", formatCodepoint(Char.ConvertToUtf32(code, index)) },
{ "name", UnicodeLookup.GetCodepointName(Char.ConvertToUtf32(code, index)) }
},
"Illegal control character. ");
}
return(cat);
}
/// <summary>
/// Check whether a given string is an identifier.
/// </summary>
/// <param name="s">String to check</param>
public static bool IsIdentifier(string s)
{
var first = StringInfo.GetNextTextElement(s);
var cat = UnicodeLookup.GetUnicodeCategory(s, 0);
if (!isIdentifierStartCharacter(first[0], cat))
{
return(false);
}
var en = StringInfo.GetTextElementEnumerator(s);
while (en.MoveNext())
{
var el = (string)en.Current;
cat = UnicodeLookup.GetUnicodeCategory(el, 0);
if (!isIdentifierCharacter(el[0], cat))
{
return(false);
}
}
return(true);
}