aaac7fed
 liuqimichale
add
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'use strict';
exports.__esModule = true;
var _postcss = require('postcss');
var _postcssValueParser = require('postcss-value-parser');
var _postcssValueParser2 = _interopRequireDefault(_postcssValueParser);
var _evenValues = require('./evenValues');
var _evenValues2 = _interopRequireDefault(_evenValues);
var _getMatch = require('./getMatch');
var _getMatch2 = _interopRequireDefault(_getMatch);
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
var keywords = [['ease', [0.25, 0.1, 0.25, 1]], ['linear', [0, 0, 1, 1]], ['ease-in', [0.42, 0, 1, 1]], ['ease-out', [0, 0, 0.58, 1]], ['ease-in-out', [0.42, 0, 0.58, 1]]];
var getValue = function getValue(node) {
return parseFloat(node.value);
};
var getMatch = (0, _getMatch2.default)(keywords);
function reduce(node) {
if (node.type !== 'function') {
return false;
}
if (node.value === 'steps') {
// Don't bother checking the step-end case as it has the same length
// as steps(1)
if (getValue(node.nodes[0]) === 1 && node.nodes[2] && node.nodes[2].value === 'start') {
node.type = 'word';
node.value = 'step-start';
delete node.nodes;
return;
}
// The end case is actually the browser default, so it isn't required.
if (node.nodes[2] && node.nodes[2].value === 'end') {
node.nodes = [node.nodes[0]];
return;
}
return false;
}
if (node.value === 'cubic-bezier') {
var match = getMatch(node.nodes.filter(_evenValues2.default).map(getValue));
if (match.length) {
node.type = 'word';
node.value = match[0][0];
delete node.nodes;
return;
}
}
}
exports.default = (0, _postcss.plugin)('cssnano-reduce-timing-functions', function () {
return function (css) {
css.walkDecls(/(animation|transition)(-timing-function|$)/, function (decl) {
decl.value = (0, _postcssValueParser2.default)(decl.value).walk(reduce).toString();
});
};
});
module.exports = exports['default'];
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