0.2.0 - Mid migration

web/node_modules/postcss-discard-duplicates/dist/index.js

@@ -0,0 +1,131 @@
+'use strict';
+
+Object.defineProperty(exports, "__esModule", {
+    value: true
+});
+
+var _postcss = require('postcss');
+
+function noop() {}
+
+function trimValue(value) {
+    return value ? value.trim() : value;
+}
+
+function empty(node) {
+    return !node.nodes.filter(child => child.type !== 'comment').length;
+}
+
+function equals(a, b) {
+    if (a.type !== b.type) {
+        return false;
+    }
+
+    if (a.important !== b.important) {
+        return false;
+    }
+
+    if (a.raws && !b.raws || !a.raws && b.raws) {
+        return false;
+    }
+
+    switch (a.type) {
+        case 'rule':
+            if (a.selector !== b.selector) {
+                return false;
+            }
+            break;
+        case 'atrule':
+            if (a.name !== b.name || a.params !== b.params) {
+                return false;
+            }
+
+            if (a.raws && trimValue(a.raws.before) !== trimValue(b.raws.before)) {
+                return false;
+            }
+
+            if (a.raws && trimValue(a.raws.afterName) !== trimValue(b.raws.afterName)) {
+                return false;
+            }
+            break;
+        case 'decl':
+            if (a.prop !== b.prop || a.value !== b.value) {
+                return false;
+            }
+
+            if (a.raws && trimValue(a.raws.before) !== trimValue(b.raws.before)) {
+                return false;
+            }
+            break;
+    }
+
+    if (a.nodes) {
+        if (a.nodes.length !== b.nodes.length) {
+            return false;
+        }
+
+        for (let i = 0; i < a.nodes.length; i++) {
+            if (!equals(a.nodes[i], b.nodes[i])) {
+                return false;
+            }
+        }
+    }
+    return true;
+}
+
+function dedupeRule(last, nodes) {
+    let index = nodes.indexOf(last) - 1;
+    while (index >= 0) {
+        const node = nodes[index--];
+        if (node && node.type === 'rule' && node.selector === last.selector) {
+            last.each(child => {
+                if (child.type === 'decl') {
+                    dedupeNode(child, node.nodes);
+                }
+            });
+
+            if (empty(node)) {
+                node.remove();
+            }
+        }
+    }
+}
+
+function dedupeNode(last, nodes) {
+    let index = !!~nodes.indexOf(last) ? nodes.indexOf(last) - 1 : nodes.length - 1;
+
+    while (index >= 0) {
+        const node = nodes[index--];
+        if (node && equals(node, last)) {
+            node.remove();
+        }
+    }
+}
+
+const handlers = {
+    rule: dedupeRule,
+    atrule: dedupeNode,
+    decl: dedupeNode,
+    comment: noop
+};
+
+function dedupe(root) {
+    const { nodes } = root;
+
+    if (!nodes) {
+        return;
+    }
+
+    let index = nodes.length - 1;
+    while (index >= 0) {
+        let last = nodes[index--];
+        if (!last || !last.parent) {
+            continue;
+        }
+        dedupe(last);
+        handlers[last.type](last, nodes);
+    }
+}
+
+exports.default = (0, _postcss.plugin)('postcss-discard-duplicates', () => dedupe);
+module.exports = exports['default'];