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node_modules/stylelint/lib/rules/selector-attribute-quotes/README.md

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+# selector-attribute-quotes
+
+Require or disallow quotes for attribute values.
+
+```css
+[target="_blank"] {}
+/**     ↑      ↑
+ * These quotes */
+```
+
+## Options
+
+`string`: `"always"|"never"`
+
+### `"always"`
+
+Attribute values *must always* be quoted.
+
+The following patterns are considered warnings:
+
+```css
+[title=flower] {}
+```
+
+```css
+[class^=top] {}
+```
+
+The following patterns are *not* considered warnings:
+
+```css
+[title] {}
+```
+
+```css
+[target="_blank"] {}
+```
+
+```css
+[class|="top"] {}
+```
+
+```css
+[title~='text'] {}
+```
+
+```css
+[data-attribute='component'] {}
+```
+
+### `"never"`
+
+Attribute values *must never* be quoted.
+
+The following patterns are considered warnings:
+
+```css
+[target="_blank"] {}
+```
+
+```css
+[class|="top"] {}
+```
+
+```css
+[title~='text'] {}
+```
+
+```css
+[data-attribute='component'] {}
+```
+
+The following patterns are *not* considered warnings:
+
+```css
+[title] {}
+```
+
+```css
+[title=flower] {}
+```
+
+```css
+[class^=top] {}
+```

node_modules/stylelint/lib/rules/selector-attribute-quotes/index.js

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+"use strict"
+
+const isStandardSyntaxRule = require("../../utils/isStandardSyntaxRule")
+const parseSelector = require("../../utils/parseSelector")
+const report = require("../../utils/report")
+const ruleMessages = require("../../utils/ruleMessages")
+const validateOptions = require("../../utils/validateOptions")
+
+const ruleName = "selector-attribute-quotes"
+
+const messages = ruleMessages(ruleName, {
+  expected: value => `Expected quotes around "${value}"`,
+  rejected: value => `Unexpected quotes around "${value}"`,
+})
+
+const rule = function (expectation) {
+  return (root, result) => {
+    const validOptions = validateOptions(result, ruleName, {
+      actual: expectation,
+      possible: [
+        "always",
+        "never",
+      ],
+    })
+    if (!validOptions) {
+      return
+    }
+
+    root.walkRules(rule => {
+      if (!isStandardSyntaxRule(rule)) {
+        return
+      }
+      if (rule.selector.indexOf("[") === -1 || rule.selector.indexOf("=") === -1) {
+        return
+      }
+
+      parseSelector(rule.selector, result, rule, selectorTree => {
+        selectorTree.walkAttributes(attributeNode => {
+          if (!attributeNode.operator) {
+            return
+          }
+
+          const attributeSelectorString = attributeNode.toString()
+
+          if (!attributeNode.quoted && expectation === "always") {
+            complain(messages.expected(attributeNode.raws.unquoted), attributeNode.sourceIndex + attributeSelectorString.indexOf(attributeNode.value))
+          }
+
+          if (attributeNode.quoted && expectation === "never") {
+            complain(messages.rejected(attributeNode.raws.unquoted), attributeNode.sourceIndex + attributeSelectorString.indexOf(attributeNode.value))
+          }
+        })
+      })
+
+      function complain(message, index) {
+        report({
+          message,
+          index,
+          result,
+          ruleName,
+          node: rule,
+        })
+      }
+    })
+  }
+}
+
+rule.ruleName = ruleName
+rule.messages = messages
+module.exports = rule