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node_modules/eslint/lib/rules/multiline-ternary.js

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+/**
+ * @fileoverview Enforce newlines between operands of ternary expressions
+ * @author Kai Cataldo
+ */
+
+"use strict";
+
+const astUtils = require("./utils/ast-utils");
+
+//------------------------------------------------------------------------------
+// Rule Definition
+//------------------------------------------------------------------------------
+
+module.exports = {
+    meta: {
+        type: "layout",
+
+        docs: {
+            description: "enforce newlines between operands of ternary expressions",
+            category: "Stylistic Issues",
+            recommended: false,
+            url: "https://eslint.org/docs/rules/multiline-ternary"
+        },
+
+        schema: [
+            {
+                enum: ["always", "always-multiline", "never"]
+            }
+        ],
+        messages: {
+            expectedTestCons: "Expected newline between test and consequent of ternary expression.",
+            expectedConsAlt: "Expected newline between consequent and alternate of ternary expression.",
+            unexpectedTestCons: "Unexpected newline between test and consequent of ternary expression.",
+            unexpectedConsAlt: "Unexpected newline between consequent and alternate of ternary expression."
+        }
+    },
+
+    create(context) {
+        const option = context.options[0];
+        const multiline = option !== "never";
+        const allowSingleLine = option === "always-multiline";
+
+        //--------------------------------------------------------------------------
+        // Helpers
+        //--------------------------------------------------------------------------
+
+        /**
+         * Tests whether node is preceded by supplied tokens
+         * @param {ASTNode} node node to check
+         * @param {ASTNode} parentNode parent of node to report
+         * @param {boolean} expected whether newline was expected or not
+         * @returns {void}
+         * @private
+         */
+        function reportError(node, parentNode, expected) {
+            context.report({
+                node,
+                messageId: `${expected ? "expected" : "unexpected"}${node === parentNode.test ? "TestCons" : "ConsAlt"}`
+            });
+        }
+
+        //--------------------------------------------------------------------------
+        // Public
+        //--------------------------------------------------------------------------
+
+        return {
+            ConditionalExpression(node) {
+                const areTestAndConsequentOnSameLine = astUtils.isTokenOnSameLine(node.test, node.consequent);
+                const areConsequentAndAlternateOnSameLine = astUtils.isTokenOnSameLine(node.consequent, node.alternate);
+
+                if (!multiline) {
+                    if (!areTestAndConsequentOnSameLine) {
+                        reportError(node.test, node, false);
+                    }
+
+                    if (!areConsequentAndAlternateOnSameLine) {
+                        reportError(node.consequent, node, false);
+                    }
+                } else {
+                    if (allowSingleLine && node.loc.start.line === node.loc.end.line) {
+                        return;
+                    }
+
+                    if (areTestAndConsequentOnSameLine) {
+                        reportError(node.test, node, true);
+                    }
+
+                    if (areConsequentAndAlternateOnSameLine) {
+                        reportError(node.consequent, node, true);
+                    }
+                }
+            }
+        };
+    }
+};