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node_modules/stylelint/lib/rules/function-url-no-scheme-relative/README.md

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+# function-url-no-scheme-relative
+
+Disallow scheme-relative urls.
+
+```css
+a { background-image: url('//www.google.com/file.jpg'); }
+/**                        ↑ 
+ *  This scheme-relative url */
+```
+
+A [scheme-relative url](https://url.spec.whatwg.org/#syntax-url-scheme-relative) is a url that begins with `//` followed by a host.
+
+This rule ignores url arguments that are variables (`$sass`, `@less`, `--custom-property`).
+
+## Options
+
+### `true`
+
+The following patterns are considered warnings:
+
+```css
+a { 
+  background: url("//www.google.com/file.jpg"); 
+}
+```
+
+The following patterns are *not* considered warnings:
+
+```css
+a { 
+  background: url("../file.jpg"); 
+}
+```
+
+```css
+a { 
+  background: url("http://www.google.com/file.jpg"); 
+}
+```
+
+```css
+a { 
+  background: url("/path/to/file.jpg"); 
+}
+```

node_modules/stylelint/lib/rules/function-url-no-scheme-relative/index.js

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+"use strict"
+
+const functionArgumentsSearch = require("../../utils/functionArgumentsSearch")
+const isStandardSyntaxUrl = require("../../utils/isStandardSyntaxUrl")
+const report = require("../../utils/report")
+const ruleMessages = require("../../utils/ruleMessages")
+const validateOptions = require("../../utils/validateOptions")
+const _ = require("lodash")
+
+const ruleName = "function-url-no-scheme-relative"
+
+const messages = ruleMessages(ruleName, {
+  rejected: "Unexpected scheme-relative url",
+})
+
+const rule = function (actual) {
+  return (root, result) => {
+    const validOptions = validateOptions(result, ruleName, { actual })
+    if (!validOptions) {
+      return
+    }
+
+    root.walkDecls(function (decl) {
+      functionArgumentsSearch(decl.toString().toLowerCase(), "url", (args, index) => {
+        const url = _.trim(args, " '\"")
+
+        if (!isStandardSyntaxUrl(url) || url.indexOf("//") !== 0) {
+          return
+        }
+
+        report({
+          message: messages.rejected,
+          node: decl,
+          index,
+          result,
+          ruleName,
+        })
+      })
+    })
+  }
+}
+
+rule.ruleName = ruleName
+rule.messages = messages
+module.exports = rule