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node_modules/stylelint/lib/rules/function-name-case/README.md

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+# function-name-case
+
+Specify lowercase or uppercase for function names.
+
+```css
+a { width: calc(5% - 10em); }
+/**        ↑
+ * These functions */
+```
+
+Camel case function names, e.g. `translateX`, are accounted for when the `lower` option is used.
+
+## Options
+
+`string`: `"lower"|"upper"`
+
+### `"lower"`
+
+The following patterns are considered warnings:
+
+```css
+a {
+  width: Calc(5% - 10em);
+}
+```
+
+```css
+a {
+  width: cAlC(5% - 10em);
+}
+```
+
+```css
+a {
+  width: CALC(5% - 10em);
+}
+```
+
+```css
+a {
+  background: -WEBKIT-RADIAL-GRADIENT(red, green, blue);
+}
+```
+
+The following patterns are *not* considered warnings:
+
+```css
+a {
+  width: calc(5% - 10em);
+}
+```
+
+```css
+a {
+  background: -webkit-radial-gradient(red, green, blue);
+}
+```
+
+### `"upper"`
+
+The following patterns are considered warnings:
+
+```css
+a {
+  width: Calc(5% - 10em);
+}
+```
+
+```css
+a {
+  width: cAlC(5% - 10em);
+}
+```
+
+```css
+a {
+  width: calc(5% - 10em);
+}
+```
+
+```css
+a {
+  background: -webkit-radial-gradient(red, green, blue);
+}
+```
+
+The following patterns are *not* considered warnings:
+
+```css
+a {
+  width: CALC(5% - 10em);
+}
+```
+
+```css
+a {
+  background: -WEBKIT-RADIAL-GRADIENT(red, green, blue);
+}
+```
+
+## Optional secondary options
+
+### `ignoreFunctions: ["/regex/", "non-regex"]`
+
+Ignore case of function names.
+
+For example, with `"lower"`.
+
+Given:
+
+```js
+["SOME-FUNCTION", "/^get.*$/"]
+```
+
+The following patterns are considered warnings:
+
+```css
+a {
+  color: sOmE-FuNcTiOn();
+}
+```
+
+```css
+a {
+  color: OTHER-SOME-FUNCTION();
+}
+```
+
+```css
+a {
+  color: GetColor();
+}
+```
+
+```css
+a {
+  color: GET_COLOR();
+}
+```
+
+The following patterns are *not* considered warnings:
+
+```css
+a {
+  display: some-function();
+}
+```
+
+```css
+a {
+  display: SOME-FUNCTION();
+}
+```
+
+```css
+a {
+  display: getColor();
+}
+```
+
+```css
+a {
+  display: get_color();
+}
+```
+
+For example, with `"upper"`.
+
+Given:
+
+```js
+["some-function", "/^get.*$/"]
+```
+
+The following patterns are considered warnings:
+
+```css
+a {
+  color: sOmE-FuNcTiOn();
+}
+```
+
+```css
+a {
+  color: other-some-function();
+}
+```
+
+```css
+a {
+  color: GetColor();
+}
+```
+
+```css
+a {
+  color: GET_COLOR();
+}
+```
+
+The following patterns are *not* considered warnings:
+
+```css
+a {
+  display: some-function();
+}
+```
+
+```css
+a {
+  display: SOME-FUNCTION();
+}
+```
+
+```css
+a {
+  display: getColor();
+}
+```
+
+```css
+a {
+  display: get_color();
+}
+```

node_modules/stylelint/lib/rules/function-name-case/index.js

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+"use strict"
+
+const declarationValueIndex = require("../../utils/declarationValueIndex")
+const isStandardSyntaxFunction = require("../../utils/isStandardSyntaxFunction")
+const matchesStringOrRegExp = require("../../utils/matchesStringOrRegExp")
+const report = require("../../utils/report")
+const ruleMessages = require("../../utils/ruleMessages")
+const validateOptions = require("../../utils/validateOptions")
+const keywordSets = require("../../reference/keywordSets")
+const _ = require("lodash")
+const valueParser = require("postcss-value-parser")
+
+const ruleName = "function-name-case"
+
+const messages = ruleMessages(ruleName, {
+  expected: (actual, expected) => `Expected "${actual}" to be "${expected}"`,
+})
+
+const mapLowercaseFunctionNamesToCamelCase = new Map()
+keywordSets.camelCaseFunctionNames.forEach(func => {
+  mapLowercaseFunctionNamesToCamelCase.set(func.toLowerCase(), func)
+})
+
+const rule = function (expectation, options) {
+  return (root, result) => {
+    const validOptions = validateOptions(result, ruleName, {
+      actual: expectation,
+      possible: [
+        "lower",
+        "upper",
+      ],
+    }, {
+      actual: options,
+      possible: {
+        ignoreFunctions: [_.isString],
+      },
+      optional: true,
+    })
+    if (!validOptions) {
+      return
+    }
+
+    root.walkDecls(decl => {
+      const value = decl.value
+
+      valueParser(value).walk(function (node) {
+        if (node.type !== "function" || !isStandardSyntaxFunction(node)) {
+          return
+        }
+
+        const functionName = node.value
+        const functionNameLowerCase = functionName.toLowerCase()
+
+        const ignoreFunctions = options && options.ignoreFunctions || []
+
+        if (ignoreFunctions.length > 0 && matchesStringOrRegExp(functionName, ignoreFunctions)) {
+          return
+        }
+
+        let expectedFunctionName = null
+
+        if (expectation === "lower" && mapLowercaseFunctionNamesToCamelCase.has(functionNameLowerCase)) {
+          expectedFunctionName = mapLowercaseFunctionNamesToCamelCase.get(functionNameLowerCase)
+        } else if (expectation === "lower") {
+          expectedFunctionName = functionNameLowerCase
+        } else {
+          expectedFunctionName = functionName.toUpperCase()
+        }
+
+        if (functionName === expectedFunctionName) {
+          return
+        }
+
+        report({
+          message: messages.expected(functionName, expectedFunctionName),
+          node: decl,
+          index: declarationValueIndex(decl) + node.sourceIndex,
+          result,
+          ruleName,
+        })
+      })
+    })
+  }
+}
+
+rule.ruleName = ruleName
+rule.messages = messages
+module.exports = rule