"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.default = void 0;

var _postcssValueParser = _interopRequireDefault(require("postcss-value-parser"));

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

const getValue = node => parseFloat(node.value);
/* Works because toString() normalizes the formatting,
   so comparing the string forms behaves the same as number equality*/


const conversions = new Map([[[0.25, 0.1, 0.25, 1].toString(), 'ease'], [[0, 0, 1, 1].toString(), 'linear'], [[0.42, 0, 1, 1].toString(), 'ease-in'], [[0, 0, 0.58, 1].toString(), 'ease-out'], [[0.42, 0, 0.58, 1].toString(), 'ease-in-out']]);

function reduce(node) {
  if (node.type !== 'function') {
    return false;
  }

  if (!node.value) {
    return;
  }

  const lowerCasedValue = node.value.toLowerCase();

  if (lowerCasedValue === 'steps') {
    // Don't bother checking the step-end case as it has the same length
    // as steps(1)
    if (node.nodes[0].type === 'word' && getValue(node.nodes[0]) === 1 && node.nodes[2] && node.nodes[2].type === 'word' && (node.nodes[2].value.toLowerCase() === 'start' || node.nodes[2].value.toLowerCase() === 'jump-start')) {
      node.type = 'word';
      node.value = 'step-start';
      delete node.nodes;
      return;
    }

    if (node.nodes[0].type === 'word' && getValue(node.nodes[0]) === 1 && node.nodes[2] && node.nodes[2].type === 'word' && (node.nodes[2].value.toLowerCase() === 'end' || node.nodes[2].value.toLowerCase() === 'jump-end')) {
      node.type = 'word';
      node.value = 'step-end';
      delete node.nodes;
      return;
    } // The end case is actually the browser default, so it isn't required.


    if (node.nodes[2] && node.nodes[2].type === 'word' && (node.nodes[2].value.toLowerCase() === 'end' || node.nodes[2].value.toLowerCase() === 'jump-end')) {
      node.nodes = [node.nodes[0]];
      return;
    }

    return false;
  }

  if (lowerCasedValue === 'cubic-bezier') {
    const values = node.nodes.filter((list, index) => {
      return index % 2 === 0;
    }).map(getValue);

    if (values.length !== 4) {
      return;
    }

    const match = conversions.get(values.toString());

    if (match) {
      node.type = 'word';
      node.value = match;
      delete node.nodes;
      return;
    }
  }
}

function transform(value) {
  return (0, _postcssValueParser.default)(value).walk(reduce).toString();
}

function pluginCreator() {
  return {
    postcssPlugin: 'postcss-normalize-timing-functions',

    OnceExit(css) {
      const cache = new Map();
      css.walkDecls(/^(-\w+-)?(animation|transition)(-timing-function)?$/i, decl => {
        const value = decl.value;

        if (cache.has(value)) {
          decl.value = cache.get(value);
          return;
        }

        const result = transform(value);
        decl.value = result;
        cache.set(value, result);
      });
    }

  };
}

pluginCreator.postcss = true;
var _default = pluginCreator;
exports.default = _default;
module.exports = exports.default;