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+/**
+ * @fileoverview enforce the location of arrow function bodies
+ * @author Sharmila Jesupaul
+ */
+"use strict";
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+module.exports = {
+ meta: {
+ docs: {
+ description: "enforce the location of arrow function bodies",
+ category: "Stylistic Issues",
+ recommended: false
+ },
+ fixable: "whitespace",
+ schema: [
+ {
+ enum: ["beside", "below"]
+ }
+ ]
+ },
+
+ create(context) {
+ const sourceCode = context.getSourceCode();
+
+ //----------------------------------------------------------------------
+ // Helpers
+ //----------------------------------------------------------------------
+ /**
+ * Gets the applicable preference for a particular keyword
+ * @returns {string} The applicable option for the keyword, e.g. 'beside'
+ */
+ function getOption() {
+ return context.options[0] || "beside";
+ }
+
+ /**
+ * Validates the location of an arrow function body
+ * @param {ASTNode} node The arrow function body
+ * @param {string} keywordName The applicable keyword name for the arrow function body
+ * @returns {void}
+ */
+ function validateExpression(node) {
+ const option = getOption();
+
+ let tokenBefore = sourceCode.getTokenBefore(node.body);
+ const hasParens = tokenBefore.value === "(";
+
+ if (node.type === "BlockStatement") {
+ return;
+ }
+
+ let fixerTarget = node.body;
+
+ if (hasParens) {
+
+ // Gets the first token before the function body that is not an open paren
+ tokenBefore = sourceCode.getTokenBefore(node.body, token => token.value !== "(");
+ fixerTarget = sourceCode.getTokenAfter(tokenBefore);
+ }
+
+ if (tokenBefore.loc.end.line === fixerTarget.loc.start.line && option === "below") {
+ context.report({
+ node: fixerTarget,
+ message: "Expected a linebreak before this expression.",
+ fix: fixer => fixer.insertTextBefore(fixerTarget, "\n")
+ });
+ } else if (tokenBefore.loc.end.line !== fixerTarget.loc.start.line && option === "beside") {
+ context.report({
+ node: fixerTarget,
+ message: "Expected no linebreak before this expression.",
+ fix: fixer => fixer.replaceTextRange([tokenBefore.range[1], fixerTarget.range[0]], " ")
+ });
+ }
+ }
+
+ //----------------------------------------------------------------------
+ // Public
+ //----------------------------------------------------------------------
+ return {
+ ArrowFunctionExpression: node => validateExpression(node)
+ };
+ }
+};