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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."
+        },
+
+        fixable: "whitespace"
+    },
+
+    create(context) {
+        const sourceCode = context.getSourceCode();
+        const option = context.options[0];
+        const multiline = option !== "never";
+        const allowSingleLine = option === "always-multiline";
+
+        //--------------------------------------------------------------------------
+        // Public
+        //--------------------------------------------------------------------------
+
+        return {
+            ConditionalExpression(node) {
+                const questionToken = sourceCode.getTokenAfter(node.test, astUtils.isNotClosingParenToken);
+                const colonToken = sourceCode.getTokenAfter(node.consequent, astUtils.isNotClosingParenToken);
+
+                const firstTokenOfTest = sourceCode.getFirstToken(node);
+                const lastTokenOfTest = sourceCode.getTokenBefore(questionToken);
+                const firstTokenOfConsequent = sourceCode.getTokenAfter(questionToken);
+                const lastTokenOfConsequent = sourceCode.getTokenBefore(colonToken);
+                const firstTokenOfAlternate = sourceCode.getTokenAfter(colonToken);
+
+                const areTestAndConsequentOnSameLine = astUtils.isTokenOnSameLine(lastTokenOfTest, firstTokenOfConsequent);
+                const areConsequentAndAlternateOnSameLine = astUtils.isTokenOnSameLine(lastTokenOfConsequent, firstTokenOfAlternate);
+
+                const hasComments = !!sourceCode.getCommentsInside(node).length;
+
+                if (!multiline) {
+                    if (!areTestAndConsequentOnSameLine) {
+                        context.report({
+                            node: node.test,
+                            loc: {
+                                start: firstTokenOfTest.loc.start,
+                                end: lastTokenOfTest.loc.end
+                            },
+                            messageId: "unexpectedTestCons",
+                            fix: fixer => {
+                                if (hasComments) {
+                                    return null;
+                                }
+                                const fixers = [];
+                                const areTestAndQuestionOnSameLine = astUtils.isTokenOnSameLine(lastTokenOfTest, questionToken);
+                                const areQuestionAndConsOnSameLine = astUtils.isTokenOnSameLine(questionToken, firstTokenOfConsequent);
+
+                                if (!areTestAndQuestionOnSameLine) {
+                                    fixers.push(fixer.removeRange([lastTokenOfTest.range[1], questionToken.range[0]]));
+                                }
+                                if (!areQuestionAndConsOnSameLine) {
+                                    fixers.push(fixer.removeRange([questionToken.range[1], firstTokenOfConsequent.range[0]]));
+                                }
+
+                                return fixers;
+                            }
+                        });
+                    }
+
+                    if (!areConsequentAndAlternateOnSameLine) {
+                        context.report({
+                            node: node.consequent,
+                            loc: {
+                                start: firstTokenOfConsequent.loc.start,
+                                end: lastTokenOfConsequent.loc.end
+                            },
+                            messageId: "unexpectedConsAlt",
+                            fix: fixer => {
+                                if (hasComments) {
+                                    return null;
+                                }
+                                const fixers = [];
+                                const areConsAndColonOnSameLine = astUtils.isTokenOnSameLine(lastTokenOfConsequent, colonToken);
+                                const areColonAndAltOnSameLine = astUtils.isTokenOnSameLine(colonToken, firstTokenOfAlternate);
+
+                                if (!areConsAndColonOnSameLine) {
+                                    fixers.push(fixer.removeRange([lastTokenOfConsequent.range[1], colonToken.range[0]]));
+                                }
+                                if (!areColonAndAltOnSameLine) {
+                                    fixers.push(fixer.removeRange([colonToken.range[1], firstTokenOfAlternate.range[0]]));
+                                }
+
+                                return fixers;
+                            }
+                        });
+                    }
+                } else {
+                    if (allowSingleLine && node.loc.start.line === node.loc.end.line) {
+                        return;
+                    }
+
+                    if (areTestAndConsequentOnSameLine) {
+                        context.report({
+                            node: node.test,
+                            loc: {
+                                start: firstTokenOfTest.loc.start,
+                                end: lastTokenOfTest.loc.end
+                            },
+                            messageId: "expectedTestCons",
+                            fix: fixer => (hasComments ? null : (
+                                fixer.replaceTextRange(
+                                    [
+                                        lastTokenOfTest.range[1],
+                                        questionToken.range[0]
+                                    ],
+                                    "\n"
+                                )
+                            ))
+                        });
+                    }
+
+                    if (areConsequentAndAlternateOnSameLine) {
+                        context.report({
+                            node: node.consequent,
+                            loc: {
+                                start: firstTokenOfConsequent.loc.start,
+                                end: lastTokenOfConsequent.loc.end
+                            },
+                            messageId: "expectedConsAlt",
+                            fix: (fixer => (hasComments ? null : (
+                                fixer.replaceTextRange(
+                                    [
+                                        lastTokenOfConsequent.range[1],
+                                        colonToken.range[0]
+                                    ],
+                                    "\n"
+                                )
+                            )))
+                        });
+                    }
+                }
+            }
+        };
+    }
+};