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build/node_modules/cssnano/dist/lib/reduceBackgroundRepeat.js

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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'];