/// <summary>
/// Evaluates the expression when formatting a message.
/// </summary>
/// <param name="field">
/// It's the field to format.
/// </param>
/// <param name="formatterContext">
/// It's the context of formatting to be used by the method.
/// </param>
/// <returns>
/// A boolean value.
/// </returns>
public override bool EvaluateFormat(Field field, ref FormatterContext formatterContext)
{
return(GetSubstring(MessageExpression.GetLeafFieldValueString(ref formatterContext, null)) ==
_valueExpression.Constant);
}
/// <summary>
/// Evaluates the expression when parsing a message.
/// </summary>
/// <param name="parserContext">
/// It's the parser context.
/// </param>
/// <returns>
/// A boolean value.
/// </returns>
public override bool EvaluateParse(ref ParserContext parserContext)
{
return(GetSubstring(MessageExpression.GetLeafFieldValueString(ref parserContext, null)) ==
_valueExpression.Constant);
}