just-the-docs/node_modules/stylelint/lib/rules/at-rule-name-case/index.js

"use strict"

const report = require("../../utils/report")
const ruleMessages = require("../../utils/ruleMessages")
const validateOptions = require("../../utils/validateOptions")

const ruleName = "at-rule-name-case"

const messages = ruleMessages(ruleName, {
  expected: (actual, expected) => `Expected "${actual}" to be "${expected}"`,
})

const rule = function (expectation) {
  return (root, result) => {
    const validOptions = validateOptions(result, ruleName, {
      actual: expectation,
      possible: [
        "lower",
        "upper",
      ],
    })
    if (!validOptions) {
      return
    }

    root.walkAtRules(atRule => {
      const name = atRule.name

      const expectedName = expectation === "lower"
        ? name.toLowerCase()
        : name.toUpperCase()

      if (name === expectedName) {
        return
      }

      report({
        message: messages.expected(name, expectedName),
        node: atRule,
        ruleName,
        result,
      })
    })
  }
}

rule.ruleName = ruleName
rule.messages = messages
module.exports = rule