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eb39fafa DC |
1 | /** |
2 | * @fileoverview Enforce newlines between operands of ternary expressions | |
3 | * @author Kai Cataldo | |
4 | */ | |
5 | ||
6 | "use strict"; | |
7 | ||
8 | const astUtils = require("./utils/ast-utils"); | |
9 | ||
10 | //------------------------------------------------------------------------------ | |
11 | // Rule Definition | |
12 | //------------------------------------------------------------------------------ | |
13 | ||
14 | module.exports = { | |
15 | meta: { | |
16 | type: "layout", | |
17 | ||
18 | docs: { | |
19 | description: "enforce newlines between operands of ternary expressions", | |
20 | category: "Stylistic Issues", | |
21 | recommended: false, | |
22 | url: "https://eslint.org/docs/rules/multiline-ternary" | |
23 | }, | |
24 | ||
25 | schema: [ | |
26 | { | |
27 | enum: ["always", "always-multiline", "never"] | |
28 | } | |
29 | ], | |
30 | messages: { | |
31 | expectedTestCons: "Expected newline between test and consequent of ternary expression.", | |
32 | expectedConsAlt: "Expected newline between consequent and alternate of ternary expression.", | |
33 | unexpectedTestCons: "Unexpected newline between test and consequent of ternary expression.", | |
34 | unexpectedConsAlt: "Unexpected newline between consequent and alternate of ternary expression." | |
35 | } | |
36 | }, | |
37 | ||
38 | create(context) { | |
39 | const option = context.options[0]; | |
40 | const multiline = option !== "never"; | |
41 | const allowSingleLine = option === "always-multiline"; | |
d3726936 | 42 | const sourceCode = context.getSourceCode(); |
eb39fafa DC |
43 | |
44 | //-------------------------------------------------------------------------- | |
45 | // Public | |
46 | //-------------------------------------------------------------------------- | |
47 | ||
48 | return { | |
49 | ConditionalExpression(node) { | |
d3726936 TL |
50 | const questionToken = sourceCode.getTokenAfter(node.test, astUtils.isNotClosingParenToken); |
51 | const colonToken = sourceCode.getTokenAfter(node.consequent, astUtils.isNotClosingParenToken); | |
52 | ||
53 | const firstTokenOfTest = sourceCode.getFirstToken(node); | |
54 | const lastTokenOfTest = sourceCode.getTokenBefore(questionToken); | |
55 | const firstTokenOfConsequent = sourceCode.getTokenAfter(questionToken); | |
56 | const lastTokenOfConsequent = sourceCode.getTokenBefore(colonToken); | |
57 | const firstTokenOfAlternate = sourceCode.getTokenAfter(colonToken); | |
58 | ||
59 | const areTestAndConsequentOnSameLine = astUtils.isTokenOnSameLine(lastTokenOfTest, firstTokenOfConsequent); | |
60 | const areConsequentAndAlternateOnSameLine = astUtils.isTokenOnSameLine(lastTokenOfConsequent, firstTokenOfAlternate); | |
eb39fafa DC |
61 | |
62 | if (!multiline) { | |
63 | if (!areTestAndConsequentOnSameLine) { | |
d3726936 TL |
64 | context.report({ |
65 | node: node.test, | |
66 | loc: { | |
67 | start: firstTokenOfTest.loc.start, | |
68 | end: lastTokenOfTest.loc.end | |
69 | }, | |
70 | messageId: "unexpectedTestCons" | |
71 | }); | |
eb39fafa DC |
72 | } |
73 | ||
74 | if (!areConsequentAndAlternateOnSameLine) { | |
d3726936 TL |
75 | context.report({ |
76 | node: node.consequent, | |
77 | loc: { | |
78 | start: firstTokenOfConsequent.loc.start, | |
79 | end: lastTokenOfConsequent.loc.end | |
80 | }, | |
81 | messageId: "unexpectedConsAlt" | |
82 | }); | |
eb39fafa DC |
83 | } |
84 | } else { | |
85 | if (allowSingleLine && node.loc.start.line === node.loc.end.line) { | |
86 | return; | |
87 | } | |
88 | ||
89 | if (areTestAndConsequentOnSameLine) { | |
d3726936 TL |
90 | context.report({ |
91 | node: node.test, | |
92 | loc: { | |
93 | start: firstTokenOfTest.loc.start, | |
94 | end: lastTokenOfTest.loc.end | |
95 | }, | |
96 | messageId: "expectedTestCons" | |
97 | }); | |
eb39fafa DC |
98 | } |
99 | ||
100 | if (areConsequentAndAlternateOnSameLine) { | |
d3726936 TL |
101 | context.report({ |
102 | node: node.consequent, | |
103 | loc: { | |
104 | start: firstTokenOfConsequent.loc.start, | |
105 | end: lastTokenOfConsequent.loc.end | |
106 | }, | |
107 | messageId: "expectedConsAlt" | |
108 | }); | |
eb39fafa DC |
109 | } |
110 | } | |
111 | } | |
112 | }; | |
113 | } | |
114 | }; |