From 26105034da4fcce7ac883c899d781f016559310d Mon Sep 17 00:00:00 2001
From: ruki <waruqi@gmail.com>
Date: Thu, 8 Nov 2018 00:38:48 +0800
Subject: switch to vuepress

---
 .../csso/lib/compressor/compress/Attribute.js      | 33 ++++++++++++++++++++++
 1 file changed, 33 insertions(+)
 create mode 100644 node_modules/csso/lib/compressor/compress/Attribute.js

(limited to 'node_modules/csso/lib/compressor/compress/Attribute.js')

diff --git a/node_modules/csso/lib/compressor/compress/Attribute.js b/node_modules/csso/lib/compressor/compress/Attribute.js
new file mode 100644
index 00000000..99cafdce
--- /dev/null
+++ b/node_modules/csso/lib/compressor/compress/Attribute.js
@@ -0,0 +1,33 @@
+// Can unquote attribute detection
+// Adopted implementation of Mathias Bynens
+// https://github.com/mathiasbynens/mothereff.in/blob/master/unquoted-attributes/eff.js
+var escapesRx = /\\([0-9A-Fa-f]{1,6})[ \t\n\f\r]?|\\./g;
+var blockUnquoteRx = /^(-?\d|--)|[\u0000-\u002c\u002e\u002f\u003A-\u0040\u005B-\u005E\u0060\u007B-\u009f]/;
+
+function canUnquote(value) {
+    if (value === '' || value === '-') {
+        return;
+    }
+
+    // Escapes are valid, so replace them with a valid non-empty string
+    value = value.replace(escapesRx, 'a');
+
+    return !blockUnquoteRx.test(value);
+}
+
+module.exports = function(node) {
+    var attrValue = node.value;
+
+    if (!attrValue || attrValue.type !== 'String') {
+        return;
+    }
+
+    var unquotedValue = attrValue.value.replace(/^(.)(.*)\1$/, '$2');
+    if (canUnquote(unquotedValue)) {
+        node.value = {
+            type: 'Identifier',
+            info: attrValue.info,
+            name: unquotedValue
+        };
+    }
+};
-- 
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