protected static bool ValidateIdentifierString(string str)
{
// stringDelimiter identifier stringDelimiter
// identifier ::= letter (letter | digit)*
if (str == null)
return true;
if (str.Length == 0)
return false; // Empty identifier
ScanResult scanResult = new ScanResult();
scanResult.SetResult(str[0]);
if (!scanResult.IsLetter())
return false; // First char non-letter
foreach (char ch in str)
{
scanResult.SetResult(ch);
if (!(scanResult.IsLetter() || scanResult.IsDigit()))
return false; // Non-letter or non-digit char
}
return true; // OK
}
protected virtual StringToken VerifyIdentifierString(StringToken token, string errorMessage)
{
// stringDelimiter identifier stringDelimiter
// identifier ::= letter (letter | digit)*
if (token == null)
return null;
string str = token.Value;
if (str.Length == 0)
{
this.ReportParserError(errorMessage, token);
return null; // Empty
}
ScanResult scanResult = new ScanResult();
scanResult.SetResult(str[0]);
if (!scanResult.IsLetter())
{
this.ReportParserError(errorMessage, token);
return null; // First char non-letter
}
foreach (char ch in str)
{
scanResult.SetResult(ch);
if (!(scanResult.IsLetter() || scanResult.IsDigit()))
{
this.ReportParserError(errorMessage, token);
return null; // Non-letter or non-digit char
}
}
return token; // OK
}
protected virtual StringToken VerifyIdentifierList(StringToken token, string errorMessage)
{
// stringDelimiter identifier* stringDelimiter
if (token == null)
return null;
if (token.Value.Length == 0)
return token;
bool inComment = false;
bool identifierStart = true;
ScanResult scanResult = new ScanResult();
foreach (char ch in token.Value)
{
scanResult.SetResult(ch);
if (scanResult.IsCommentDelimiter())
{
inComment = !inComment;
identifierStart = true;
}
else
{
if (!inComment)
{
if (scanResult.IsWhitespace())
{
identifierStart = true;
}
else
{
if (identifierStart)
{
if (!scanResult.IsLetter())
{
this.ReportParserError(errorMessage, token);
return null;
}
identifierStart = false;
}
else
{
if (!(scanResult.IsLetter() || scanResult.IsDigit()))
{
this.ReportParserError(errorMessage, token);
return null;
}
}
}
}
}
}
return token;
}