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node_modules/stylelint/lib/rules/string-quotes/README.md

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+# string-quotes
+
+Specify single or double quotes around strings.
+
+```css
+a[id="foo"] { content: "x"; }
+/**  ↑   ↑             ↑ ↑
+ * These quotes and these quotes */
+```
+
+Quotes within comments are ignored.
+
+```css
+/* "This is fine" */
+/* 'And this is also fine' */
+```
+
+## Options
+
+`string`: `"single"|"double"`
+
+### `"single"`
+
+Strings *must always* be wrapped with single quotes.
+
+The following patterns are considered warnings:
+
+```css
+a { content: "x"; }
+```
+
+```css
+a[id="foo"] {}
+```
+
+The following patterns are *not* considered warnings:
+
+```css
+a { content: 'x'; }
+```
+
+```css
+a[id='foo'] {}
+```
+
+### `"double"`
+
+Strings *must always* be wrapped with double quotes.
+
+The following patterns are considered warnings:
+
+```css
+a { content: 'x'; }
+```
+
+```css
+a[id='foo'] {}
+```
+
+The following patterns are *not* considered warnings:
+
+```css
+a { content: "x"; }
+```
+
+```css
+a[id="foo"] {}
+```

node_modules/stylelint/lib/rules/string-quotes/index.js

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+"use strict"
+
+const report = require("../../utils/report")
+const ruleMessages = require("../../utils/ruleMessages")
+const validateOptions = require("../../utils/validateOptions")
+const styleSearch = require("style-search")
+
+const ruleName = "string-quotes"
+
+const messages = ruleMessages(ruleName, {
+  expected: q => `Expected ${q} quotes`,
+})
+
+const rule = function (expectation) {
+  const erroneousQuote = expectation === "single" ? "\"" : "'"
+
+  return (root, result) => {
+    const validOptions = validateOptions(result, ruleName, {
+      actual: expectation,
+      possible: [
+        "single",
+        "double",
+      ],
+    })
+    if (!validOptions) {
+      return
+    }
+
+    const cssString = root.toString()
+    styleSearch({ source: cssString, target: erroneousQuote }, match => {
+      report({
+        message: messages.expected(expectation),
+        node: root,
+        index: match.startIndex,
+        result,
+        ruleName,
+      })
+    })
+  }
+}
+
+rule.ruleName = ruleName
+rule.messages = messages
+module.exports = rule