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node_modules/stylelint/lib/rules/media-feature-parentheses-space-inside/README.md

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+# media-feature-parentheses-space-inside
+
+Require a single space or disallow whitespace on the inside of the parentheses within media features.
+
+```css
+@media ( max-width: 300px ) {}
+/**    ↑                  ↑
+ * The space inside these two parentheses */
+```
+
+## Options
+
+`string`: `"always"|"never"`
+
+### `"always"`
+
+There *must always* be a single space inside the parentheses.
+
+The following patterns are considered warnings:
+
+```css
+@media (max-width: 300px) {}
+```
+
+```css
+@media (max-width: 300px ) {}
+```
+
+The following patterns are *not* considered warnings:
+
+```css
+@media ( max-width: 300px ) {}
+```
+
+### `"never"`
+
+There *must never* be whitespace on the inside the parentheses.
+
+The following patterns are considered warnings:
+
+```css
+@media ( max-width: 300px ) {}
+```
+
+```css
+@media ( max-width: 300px) {}
+```
+
+The following patterns are *not* considered warnings:
+
+```css
+@media (max-width: 300px) {}
+```

node_modules/stylelint/lib/rules/media-feature-parentheses-space-inside/index.js

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+"use strict"
+
+const atRuleParamIndex = require("../../utils/atRuleParamIndex")
+const report = require("../../utils/report")
+const ruleMessages = require("../../utils/ruleMessages")
+const validateOptions = require("../../utils/validateOptions")
+const _ = require("lodash")
+const styleSearch = require("style-search")
+
+const ruleName = "media-feature-parentheses-space-inside"
+
+const messages = ruleMessages(ruleName, {
+  expectedOpening: "Expected single space after \"(\"",
+  rejectedOpening: "Unexpected whitespace after \"(\"",
+  expectedClosing: "Expected single space before \")\"",
+  rejectedClosing: "Unexpected whitespace before \")\"",
+})
+
+const rule = function (expectation) {
+  return (root, result) => {
+    const validOptions = validateOptions(result, ruleName, {
+      actual: expectation,
+      possible: [
+        "always",
+        "never",
+      ],
+    })
+    if (!validOptions) {
+      return
+    }
+
+    root.walkAtRules(/^media$/i, atRule => {
+      // If there are comments in the params, the complete string
+      // will be at atRule.raws.params.raw
+      const params = _.get(atRule, "raws.params.raw", atRule.params)
+      const indexBoost = atRuleParamIndex(atRule)
+
+      styleSearch({ source: params, target: "(" }, match => {
+        const nextCharIsSpace = params[match.startIndex + 1] === " "
+        if (nextCharIsSpace && expectation === "never") {
+          report({
+            message: messages.rejectedOpening,
+            node: atRule,
+            index: match.startIndex + 1 + indexBoost,
+            result,
+            ruleName,
+          })
+        }
+        if (!nextCharIsSpace && expectation === "always") {
+          report({
+            message: messages.expectedOpening,
+            node: atRule,
+            index: match.startIndex + 1 + indexBoost,
+            result,
+            ruleName,
+          })
+        }
+      })
+
+      styleSearch({ source: params, target: ")" }, match => {
+        const prevCharIsSpace = params[match.startIndex - 1] === " "
+        if (prevCharIsSpace && expectation === "never") {
+          report({
+            message: messages.rejectedClosing,
+            node: atRule,
+            index: match.startIndex - 1 + indexBoost,
+            result,
+            ruleName,
+          })
+        }
+        if (!prevCharIsSpace && expectation === "always") {
+          report({
+            message: messages.expectedClosing,
+            node: atRule,
+            index: match.startIndex - 1 + indexBoost,
+            result,
+            ruleName,
+          })
+        }
+      })
+    })
+  }
+}
+
+rule.ruleName = ruleName
+rule.messages = messages
+module.exports = rule