assertvanish/glasses.js

assert that an object will vanish

(function() {
  var extractWayFromTree, getIndentation, getParentLine;
  extractWayFromTree = function(tree, line) {
    var lines, way;
    lines = tree.split('\n');
    way = [];
    while (line != null) {
      way.unshift(lines[line]);
      line = getParentLine(lines, line);
    }
    return way.join('\n');
  };
  getIndentation = function(line) {
    return line.match(/^ */)[0].length;
  };
  getParentLine = function(lines, line) {
    var childIndentation;
    childIndentation = getIndentation(lines[line]);
    while (line > 0) {
      line--;
      if (childIndentation - 2 === getIndentation(lines[line])) {
        return line;
      }
    }
    return null;
  };
  module.exports = {
    extractWayFromTree: extractWayFromTree
  };
}).call(this);