text: ////////////////////////////////////////////////////////////////////////////////
  //
  // Copyright 2006 - 2021, Tomas Babej, Paul Beckingham, Federico Hernandez.
  //
  // Permission is hereby granted, free of charge, to any person obtaining a copy
  // of this software and associated documentation files (the "Software"), to deal
  // in the Software without restriction, including without limitation the rights
  // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  // copies of the Software, and to permit persons to whom the Software is
  // furnished to do so, subject to the following conditions:
  //
  // The above copyright notice and this permission notice shall be included
  // in all copies or substantial portions of the Software.
  //
  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
  // OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  // THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  // SOFTWARE.
  //
  // https://www.opensource.org/licenses/mit-license.php
  //
  ////////////////////////////////////////////////////////////////////////////////
  
  #include <cmake.h>
  #include <ColTypeString.h>
  #include <Context.h>
  #include <Eval.h>
  #include <Variant.h>
  #include <Filter.h>
  #include <format.h>
  
  #define STRING_INVALID_MOD           "The '{1}' attribute does not allow a value of '{2}'."
  
  ////////////////////////////////////////////////////////////////////////////////
  ColumnTypeString::ColumnTypeString ()
  {
    _type = "string";
  }
  
  ////////////////////////////////////////////////////////////////////////////////
  bool ColumnTypeString::validate (const std::string& input) const
  {
    return input.length () ? true : false;
  }
  
  ////////////////////////////////////////////////////////////////////////////////
  void ColumnTypeString::modify (Task& task, const std::string& value)
  {
    std::string label = "  [1;37;43mMODIFICATION[0m ";
  
    // Only if it's a DOM ref, eval it first.
    Lexer lexer (value);
    std::string domRef;
    Lexer::Type type;
    if (lexer.token (domRef, type) &&
        type == Lexer::Type::dom &&
        // Ensure 'value' contains only the DOM reference and no other tokens
        // The lexer.token returns false for end-of-string.
        // This works as long as all the DOM references we should support consist
        // only of a single token.
        lexer.token (domRef, type) == false)
    {
      Eval e;
      e.addSource (domSource);
  
      Variant v;
      e.evaluateInfixExpression (value, v);
      std::string strValue = (std::string) v;
      if (validate (strValue))
      {
        task.set (_name, strValue);
        Context::getContext ().debug (label + _name + " <-- '" + strValue + "' <-- '" + value + '\'');
      }
      else
        throw format (STRING_INVALID_MOD, _name, value);
    }
    else
    {
      if (validate (value))
      {
        task.set (_name, value);
        Context::getContext ().debug (label + _name + " <-- '" + value + '\'');
      }
      else
        throw format (STRING_INVALID_MOD, _name, value);
    }
  }
  
  ////////////////////////////////////////////////////////////////////////////////
  