"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports["default"] = collapseWhitespace;

var _normalizeHtmlWhitespace = _interopRequireDefault(require("normalize-html-whitespace"));

var _helpers = require("../helpers");

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { "default": obj }; }

var noWhitespaceCollapseElements = new Set(['script', 'style', 'pre', 'textarea']);
/** Collapses redundant whitespaces */

function collapseWhitespace(tree, options, collapseType, tag) {
  if (collapseType !== 'all') {
    collapseType = 'conservative';
  }

  tree.forEach(function (node, index) {
    if (typeof node === 'string' && !(0, _helpers.isComment)(node)) {
      var isTopLevel = !tag || tag === 'html' || tag === 'head';
      node = collapseRedundantWhitespaces(node, collapseType, isTopLevel);
    }

    var isAllowCollapseWhitespace = !noWhitespaceCollapseElements.has(node.tag);

    if (node.content && node.content.length && isAllowCollapseWhitespace) {
      node.content = collapseWhitespace(node.content, options, collapseType, node.tag);
    }

    tree[index] = node;
  });
  return tree;
}

function collapseRedundantWhitespaces(text, collapseType) {
  var isTopLevel = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : false;
  text = text && text.length > 0 ? (0, _normalizeHtmlWhitespace["default"])(text) : '';

  if (collapseType === 'all' || isTopLevel) {
    text = text.trim();
  }

  return text;
}