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export function escapeHTML(value) {
  return value.replace(/&/g, '&').replace(/</g, '<').replace(/>/g, '>');
}

/**
 * performs a shallow merge of multiple objects into one
 *
 * @arguments list of objects with properties to merge
 * @returns a single new object
 */
export function inherit(parent) { // inherit(parent, override_obj, override_obj, ...)
  var result = {};
  var objects = Array.prototype.slice.call(arguments, 1);

for (const key in parent) {
    result[key] = parent[key];
  }
  objects.forEach(function(obj) {
    for (const key in obj) {
      result[key] = obj[key];
    }
  });
  return result;
}

/* Stream merging */

function tag(node) {
  return node.nodeName.toLowerCase();
}

export function nodeStream(node) {
  var result = [];
  (function _nodeStream(node, offset) {
    for (var child = node.firstChild; child; child = child.nextSibling) {
      if (child.nodeType === 3) {
        offset += child.nodeValue.length;
      } else if (child.nodeType === 1) {
        result.push({
          event: 'start',
          offset: offset,
          node: child
        });
        offset = _nodeStream(child, offset);
        // Prevent void elements from having an end tag that would actually
        // double them in the output. There are more void elements in HTML
        // but we list only those realistically expected in code display.
        if (!tag(child).match(/br|hr|img|input/)) {
          result.push({
            event: 'stop',
            offset: offset,
            node: child
          });
        }
      }
    }
    return offset;
  })(node, 0);
  return result;
}

export function mergeStreams(original, highlighted, value) {
  var processed = 0;
  var result = '';
  var nodeStack = [];

function selectStream() {
    if (!original.length || !highlighted.length) {
      return original.length ? original : highlighted;
    }
    if (original[0].offset !== highlighted[0].offset) {
      return (original[0].offset < highlighted[0].offset) ? original : highlighted;
    }

/*
    To avoid starting the stream just before it should stop the order is
    ensured that original always starts first and closes last:

if (event1 == 'start' && event2 == 'start')
      return original;
    if (event1 == 'start' && event2 == 'stop')
      return highlighted;
    if (event1 == 'stop' && event2 == 'start')
      return original;
    if (event1 == 'stop' && event2 == 'stop')
      return highlighted;

... which is collapsed to:
    */
    return highlighted[0].event === 'start' ? original : highlighted;
  }

function open(node) {
    function attr_str(a) {
      return ' ' + a.nodeName + '="' + escapeHTML(a.value).replace(/"/g, '"') + '"';
    }
    result += '<' + tag(node) + [].map.call(node.attributes, attr_str).join('') + '>';
  }

function close(node) {
    result += '</' + tag(node) + '>';
  }

function render(event) {
    (event.event === 'start' ? open : close)(event.node);
  }

while (original.length || highlighted.length) {
    var stream = selectStream();
    result += escapeHTML(value.substring(processed, stream[0].offset));
    processed = stream[0].offset;
    if (stream === original) {
      /*
      On any opening or closing tag of the original markup we first close
      the entire highlighted node stack, then render the original tag along
      with all the following original tags at the same offset and then
      reopen all the tags on the highlighted stack.
      */
      nodeStack.reverse().forEach(close);
      do {
        render(stream.splice(0, 1)[0]);
        stream = selectStream();
      } while (stream === original && stream.length && stream[0].offset === processed);
      nodeStack.reverse().forEach(open);
    } else {
      if (stream[0].event === 'start') {
        nodeStack.push(stream[0].node);
      } else {
        nodeStack.pop();
      }
      render(stream.splice(0, 1)[0]);
    }
  }
  return result + escapeHTML(value.substr(processed));
}