Initial commit

node_modules/stylelint/lib/rules/function-url-scheme-whitelist/index.js

@@ -0,0 +1,73 @@
+"use strict"
+
+const containsString = require("../../utils/containsString")
+const functionArgumentsSearch = require("../../utils/functionArgumentsSearch")
+const isStandardSyntaxUrl = require("../../utils/isStandardSyntaxUrl")
+const report = require("../../utils/report")
+const ruleMessages = require("../../utils/ruleMessages")
+const validateOptions = require("../../utils/validateOptions")
+const _ = require("lodash")
+const parse = require("url").parse
+
+const ruleName = "function-url-scheme-whitelist"
+
+const messages = ruleMessages(ruleName, {
+  rejected: scheme => `Unexpected url scheme "${scheme}:"`,
+})
+
+const rule = function (whitelist) {
+  return (root, result) => {
+    const validOptions = validateOptions(result, ruleName, {
+      actual: whitelist,
+      possible: [_.isString],
+    })
+    if (!validOptions) {
+      return
+    }
+
+    root.walkDecls(function (decl) {
+      functionArgumentsSearch(decl.toString().toLowerCase(), "url", (args, index) => {
+        const unspacedUrlString = _.trim(args, " ")
+        if (!isStandardSyntaxUrl(unspacedUrlString)) {
+          return
+        }
+        const urlString = _.trim(unspacedUrlString, "'\"")
+
+        const url = parse(urlString)
+        if (url.protocol === null) {
+          return
+        }
+
+        const scheme = url.protocol.toLowerCase().slice(0, -1) // strip trailing `:`
+
+        // The URL spec does not require a scheme to be followed by `//`, but checking
+        // for it allows this rule to differentiate <scheme>:<hostname> urls from
+        // <hostname>:<port> urls. `data:` scheme urls are an exception to this rule.
+        const slashIndex = url.protocol.length
+        const expectedSlashes = urlString.slice(slashIndex, slashIndex + 2)
+        const isSchemeLessUrl = expectedSlashes !== "//" && scheme !== "data"
+        if (isSchemeLessUrl) {
+          return
+        }
+
+        const whitelistLowerCase = typeof whitelist === "string" ? whitelist.toLowerCase() : whitelist.join("|").toLowerCase().split("|")
+
+        if (containsString(scheme, whitelistLowerCase)) {
+          return
+        }
+
+        report({
+          message: messages.rejected(scheme),
+          node: decl,
+          index,
+          result,
+          ruleName,
+        })
+      })
+    })
+  }
+}
+
+rule.ruleName = ruleName
+rule.messages = messages
+module.exports = rule