/// <summary>
/// Replaces the text variables by their formatted values.
/// The original text in the argument remains unchanged.
/// </summary>
private StringBuilder ReplaceTextVariablesWithValues(StringBuilder text, List <Variable> textVariables)
{
// work on a copy of the orginal text
var textResult = new StringBuilder(text.ToString());
if (textResult.Length == 0)
{
return(textResult);
}
// first read in all external files - this is done only once - no recursion.
bool textFileWasIncluded = false;
foreach (Variable variable in textVariables.Where(variable => !string.IsNullOrEmpty(variable.Format) && _formatAsFilename == variable.Format.ToLower()))
{
// If a format name called "file" is found, the variable's value is interpreted as a file name
// The file name may contain variables as well.
using (TextVariableManager tvm = Clone())
{
string filename = tvm.Process(variable.Value as string ?? string.Empty);
// add all new bad variable names to the list
foreach (string badVar in tvm.BadVariables.Where(badVar => !BadVariables.Contains(badVar)))
{
BadVariables.Add(badVar);
}
filename = MakeFullPath(filename);
string content = ReadFile(filename);
if (content == null)
{
if (FileVariableErrors == VariableError.ReplaceWithEmptyString)
{
textResult = textResult.Replace(variable.MatchingString, string.Empty);
}
}
else
{
textResult = textResult.Replace(variable.MatchingString, content);
}
textFileWasIncluded = true;
}
}
// if a text file was included, re-search and replace the text for variables
if (textFileWasIncluded)
{
foreach (Variable variable in SearchTextVariables(textResult).Where(variable => variable.Format != _formatAsFilename || FileVariableErrors != VariableError.ShowTextVariable))
{
textResult = textResult.Replace(variable.MatchingString, variable.ToString());
}
}
// Next replace variables for the whole text (including any text files read before).
// If a text file was included, it could again contain variables - but do NOT process
// external text files recursively.
return(textVariables.Aggregate(textResult, (current, variable) => current.Replace(variable.MatchingString, variable.ToString())));
}
/// <summary>
/// Replaces all variables in the text with their corresponding values.
/// Used for subject, body and attachment.
/// </summary>
/// <param name="text">Text to search and replace.</param>
/// <returns>Returns the text with all variables replaced.</returns>
private StringBuilder SearchAndReplaceVars(StringBuilder text)
{
_textVariableManager.Text = text;
StringBuilder toReturn = _textVariableManager.Process();
_badVariableNames = _textVariableManager.BadVariables;
_badInlineFiles = _textVariableManager.BadFiles;
return(toReturn);
}