--- /dev/null
+"use strict";
+
+const addEmptyLineBefore = require("../../utils/addEmptyLineBefore");
+const blockString = require("../../utils/blockString");
+const getPreviousNonSharedLineCommentNode = require("../../utils/getPreviousNonSharedLineCommentNode");
+const hasEmptyLine = require("../../utils/hasEmptyLine");
+const isAfterComment = require("../../utils/isAfterComment");
+const isCustomProperty = require("../../utils/isCustomProperty");
+const isFirstNested = require("../../utils/isFirstNested");
+const isSingleLineString = require("../../utils/isSingleLineString");
+const isStandardSyntaxDeclaration = require("../../utils/isStandardSyntaxDeclaration");
+const optionsMatches = require("../../utils/optionsMatches");
+const removeEmptyLinesBefore = require("../../utils/removeEmptyLinesBefore");
+const report = require("../../utils/report");
+const ruleMessages = require("../../utils/ruleMessages");
+const validateOptions = require("../../utils/validateOptions");
+
+const ruleName = "custom-property-empty-line-before";
+
+const messages = ruleMessages(ruleName, {
+ expected: "Expected empty line before custom property",
+ rejected: "Unexpected empty line before custom property"
+});
+
+const rule = function(expectation, options, context) {
+ return (root, result) => {
+ const validOptions = validateOptions(
+ result,
+ ruleName,
+ {
+ actual: expectation,
+ possible: ["always", "never"]
+ },
+ {
+ actual: options,
+ possible: {
+ except: ["first-nested", "after-comment", "after-custom-property"],
+ ignore: ["after-comment", "inside-single-line-block"]
+ },
+ optional: true
+ }
+ );
+ if (!validOptions) {
+ return;
+ }
+
+ root.walkDecls(decl => {
+ const prop = decl.prop,
+ parent = decl.parent;
+
+ if (!isStandardSyntaxDeclaration(decl)) {
+ return;
+ }
+ if (!isCustomProperty(prop)) {
+ return;
+ }
+
+ // Optionally ignore the node if a comment precedes it
+ if (
+ optionsMatches(options, "ignore", "after-comment") &&
+ isAfterComment(decl)
+ ) {
+ return;
+ }
+
+ // Optionally ignore nodes inside single-line blocks
+ if (
+ optionsMatches(options, "ignore", "inside-single-line-block") &&
+ isSingleLineString(blockString(parent))
+ ) {
+ return;
+ }
+
+ let expectEmptyLineBefore = expectation === "always" ? true : false;
+
+ // Optionally reverse the expectation if any exceptions apply
+ if (
+ (optionsMatches(options, "except", "first-nested") &&
+ isFirstNested(decl)) ||
+ (optionsMatches(options, "except", "after-comment") &&
+ isAfterComment(decl)) ||
+ (optionsMatches(options, "except", "after-custom-property") &&
+ isAfterCustomProperty(decl))
+ ) {
+ expectEmptyLineBefore = !expectEmptyLineBefore;
+ }
+
+ const hasEmptyLineBefore = hasEmptyLine(decl.raws.before);
+
+ // Return if the expectation is met
+ if (expectEmptyLineBefore === hasEmptyLineBefore) {
+ return;
+ }
+
+ // Fix
+ if (context.fix) {
+ if (expectEmptyLineBefore) {
+ addEmptyLineBefore(decl, context.newline);
+ } else {
+ removeEmptyLinesBefore(decl, context.newline);
+ }
+
+ return;
+ }
+
+ const message = expectEmptyLineBefore
+ ? messages.expected
+ : messages.rejected;
+ report({
+ message,
+ node: decl,
+ result,
+ ruleName
+ });
+ });
+ };
+};
+
+function isAfterCustomProperty(decl) {
+ const prevNode = getPreviousNonSharedLineCommentNode(decl);
+ return prevNode && prevNode.prop && isCustomProperty(prevNode.prop);
+}
+
+rule.ruleName = ruleName;
+rule.messages = messages;
+module.exports = rule;