public override void Visit(SqlUnaryScalarExpression sqlUnaryScalarExpression)
{
this.writer.Write("(");
this.writer.Write(SqlObjectTextSerializer.SqlUnaryScalarOperatorKindToString(sqlUnaryScalarExpression.OperatorKind));
this.writer.Write(" ");
sqlUnaryScalarExpression.Expression.Accept(this);
this.writer.Write(")");
}
unsafe private static void WriteEscapedString(StringBuilder stringBuilder, ReadOnlySpan <char> unescapedString)
{
while (!unescapedString.IsEmpty)
{
int?indexOfFirstCharacterThatNeedsEscaping = SqlObjectTextSerializer.IndexOfCharacterThatNeedsEscaping(unescapedString);
if (!indexOfFirstCharacterThatNeedsEscaping.HasValue)
{
// No escaping needed;
indexOfFirstCharacterThatNeedsEscaping = unescapedString.Length;
}
// Write as much of the string as possible
ReadOnlySpan <char> noEscapeNeededPrefix = unescapedString.Slice(
start: 0,
length: indexOfFirstCharacterThatNeedsEscaping.Value);
fixed(char *noEscapeNeedPrefixPointer = noEscapeNeededPrefix)
{
stringBuilder.Append(noEscapeNeedPrefixPointer, noEscapeNeededPrefix.Length);
}
unescapedString = unescapedString.Slice(start: indexOfFirstCharacterThatNeedsEscaping.Value);
// Escape the next character if it exists
if (!unescapedString.IsEmpty)
{
char character = unescapedString[0];
unescapedString = unescapedString.Slice(start: 1);
switch (character)
{
case '\\':
stringBuilder.Append('\\');
stringBuilder.Append('\\');
break;
case '"':
stringBuilder.Append('\\');
stringBuilder.Append('"');
break;
case '/':
stringBuilder.Append('\\');
stringBuilder.Append('/');
break;
case '\b':
stringBuilder.Append('\\');
stringBuilder.Append('b');
break;
case '\f':
stringBuilder.Append('\\');
stringBuilder.Append('f');
break;
case '\n':
stringBuilder.Append('\\');
stringBuilder.Append('n');
break;
case '\r':
stringBuilder.Append('\\');
stringBuilder.Append('r');
break;
case '\t':
stringBuilder.Append('\\');
stringBuilder.Append('t');
break;
default:
char wideCharToEscape = (char)character;
// We got a control character (U+0000 through U+001F).
stringBuilder.Append('\\');
stringBuilder.Append('u');
stringBuilder.Append(SqlObjectTextSerializer.GetHexDigit((wideCharToEscape >> 12) & 0xF));
stringBuilder.Append(SqlObjectTextSerializer.GetHexDigit((wideCharToEscape >> 8) & 0xF));
stringBuilder.Append(SqlObjectTextSerializer.GetHexDigit((wideCharToEscape >> 4) & 0xF));
stringBuilder.Append(SqlObjectTextSerializer.GetHexDigit((wideCharToEscape >> 0) & 0xF));
break;
}
}
}
}
public override void Visit(SqlStringLiteral sqlStringLiteral)
{
this.writer.Write("\"");
SqlObjectTextSerializer.WriteEscapedString(this.writer.GetStringBuilder(), sqlStringLiteral.Value.AsSpan());
this.writer.Write("\"");
}
public override void Visit(SqlNumberLiteral sqlNumberLiteral)
{
SqlObjectTextSerializer.WriteNumber64(this.writer.GetStringBuilder(), sqlNumberLiteral.Value);
}