update/upgrade

1 files changed, 72 insertions, 0 deletions

diff --git a/node_modules/postcss-unnth/index.js b/node_modules/postcss-unnth/index.js
new file mode 100644
index 00000000..a85788c7
--- /dev/null
+++ b/node_modules/postcss-unnth/index.js
@@ -0,0 +1,72 @@
+var postcss = require('postcss');
+var parser  = require('postcss-selector-parser');
+
+module.exports = postcss.plugin('postcss-unnth', function () {
+	return function (css) {
+		css.walkRules(function (rule) {
+			if (rule.selector.indexOf(':nth-child') > -1) {
+				rule.selector = parser(function (selectors) {
+					selectors.each(function (selector) {
+						selector.eachPseudo(function (pseudo) {
+							if (pseudo.value === ':nth-child') {
+								var siblings = [];
+								var firstChild = parser.pseudo({ value: ':first-child' });
+
+								// get sibling selectors
+								pseudo.parent.nodes.some(function (sibling) {
+									if (sibling === pseudo) return true;
+
+									siblings.push(sibling);
+
+									if (sibling.type === 'combinator') {
+										siblings = [];
+									}
+								});
+
+								// add sibling fallbacks
+								String(pseudo.nodes).replace('even', '2n').replace('odd', '2n+1').replace(/^([-+]?\d*)(n?)([-+]?\d+)?$/, function ($0, $1, $2, $3) {
+									if ($1 && !$2 && !$3) {
+										$3 = $1;
+										$2 = 'n';
+										$1 = '0';
+									}
+
+									$1 = parseFloat($1) || 0;
+									$3 = parseFloat($3) || 0;
+
+									if ($3 > 1) {
+										// move sibling selectors after :nth-child
+										siblings.forEach(function (sibling) {
+											sibling.removeSelf();
+
+											pseudo.parent.insertAfter(pseudo, sibling);
+										});
+
+										// add immediate fallback
+										pseudo.parent.insertBefore(pseudo, firstChild);
+										pseudo.parent.insertBefore(pseudo, parser.combinator({ value: ' + ' }));
+
+										while (--$3 > 1) {
+											pseudo.parent.insertBefore(pseudo, parser.tag({ value: '*' }));
+											pseudo.parent.insertBefore(pseudo, parser.combinator({ value: ' + ' }));
+										}
+
+										// add selector fallback
+										if (!siblings.length) {
+											pseudo.parent.insertBefore(pseudo, parser.tag({ value: '*' }));
+										}
+									} else {
+										pseudo.parent.insertAfter(pseudo, firstChild);
+									}
+								});
+
+								// remove original
+								pseudo.removeSelf();
+							}
+						});
+					});
+				}).process(rule.selector).result.toString();
+			}
+		});
+	};
+});