code: function _generateLineMap (res, file) {
      if (res.errors && res.errors.length) {
          return;
      }
      var syntaxTree = res.syntaxTree, templates = [];
      // identify the templates in the syntax tree
      for (var i = 0; i < syntaxTree.length; i++) {
          if (syntaxTree[i].type === 'template') {
              templates.push(syntaxTree[i]);
          }
      }
  
      var nbrOfLinesInCompiledTemplate = 5; //all generated templates got fixed no of LOC
      var lineMap = [], pos = HEADER_SZ, template;
      var pos1 = -1; // position of the next template start
      var pos2 = -1; // position of the next template end
      var tplIdx = -1; // position of the current template
  
      for (var i = 0; i < (file.split(/\n/g).length + 1); i++) {
          if (i === 0 || i === pos2) {
              // end of current template: let's determine next pos1 and pos2
              tplIdx = (i === 0) ? 0 : tplIdx + 1;
              if (tplIdx < templates.length) {
                  // there is another template
                  template = templates[tplIdx];
                  pos1 = template.startLine;
                  pos2 = Math.max(template.endLine, pos1);
              } else {
                  // last template has been found
                  tplIdx = pos1 = pos2 = -1;
              }
              if (i === 0) {
                  lineMap[0] = 0;
              }
              i++;
          }
          if (i === pos1) {
              for (var j = pos1; j < (pos2 + 1); j++) {
                  // all lines are set to the template start
                  lineMap[i] = pos;
                  i++;
              }
              pos += nbrOfLinesInCompiledTemplate;
              i -= 2; // to enter the i===pos2 clause at next step
          } else {
              lineMap[i] = pos;
              pos++;
          }
      }
      return lineMap;
  }
docs: Generate the line map of a compilatin result
  @param {JSON} res the result object of a compilation - cf. compile function
  @param {String} file the template file (before compilation)