aaac7fed
 liuqimichale
add
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'use strict';
exports.__esModule = true;
var _postcss = require('postcss');
var _postcss2 = _interopRequireDefault(_postcss);
var _postcssValueParser = require('postcss-value-parser');
var _postcssValueParser2 = _interopRequireDefault(_postcssValueParser);
var _evenValues = require('./evenValues');
var _evenValues2 = _interopRequireDefault(_evenValues);
var _getArguments = require('./getArguments');
var _getArguments2 = _interopRequireDefault(_getArguments);
var _getMatch = require('./getMatch');
var _getMatch2 = _interopRequireDefault(_getMatch);
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
var mappings = [['repeat-x', ['repeat', 'no-repeat']], ['repeat-y', ['no-repeat', 'repeat']], ['repeat', ['repeat', 'repeat']], ['space', ['space', 'space']], ['round', ['round', 'round']], ['no-repeat', ['no-repeat', 'no-repeat']]];
var repeat = [mappings[0][0], mappings[1][0], mappings[2][0], mappings[3][0], mappings[4][0], mappings[5][0]];
var getMatch = (0, _getMatch2.default)(mappings);
function transform(decl) {
var values = (0, _postcssValueParser2.default)(decl.value);
if (values.nodes.length === 1) {
return;
}
var args = (0, _getArguments2.default)(values);
var relevant = [];
args.forEach(function (arg) {
relevant.push({
start: null,
end: null
});
arg.forEach(function (part, index) {
var isRepeat = ~repeat.indexOf(part.value);
var len = relevant.length - 1;
if (relevant[len].start === null && isRepeat) {
relevant[len].start = index;
relevant[len].end = index;
return;
}
if (relevant[len].start !== null) {
if (part.type === 'space') {
return;
} else if (isRepeat) {
relevant[len].end = index;
return;
}
return;
}
});
});
relevant.forEach(function (range, index) {
if (range.start === null) {
return;
}
var val = args[index].slice(range.start, range.end + 1);
if (val.length !== 3) {
return;
}
var match = getMatch(val.filter(_evenValues2.default).map(function (n) {
return n.value;
}));
if (match.length) {
args[index][range.start].value = match[0][0];
args[index][range.start + 1].value = '';
args[index][range.end].value = '';
}
});
decl.value = values.toString();
}
var plugin = _postcss2.default.plugin('cssnano-reduce-background-repeat', function () {
return function (css) {
return css.walkDecls(/background(-repeat|$)/, transform);
};
});
plugin.mappings = mappings;
exports.default = plugin;
module.exports = exports['default'];
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