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4 |
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5 | "use strict";
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6 |
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8 |
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9 |
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10 |
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11 | const POSITION_SCHEMA = { enum: ["beside", "below", "any"] };
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12 |
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13 | module.exports = {
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14 | meta: {
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15 | type: "layout",
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16 |
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17 | docs: {
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18 | description: "enforce the location of single-line statements",
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19 | category: "Stylistic Issues",
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20 | recommended: false,
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21 | url: "https://eslint.org/docs/rules/nonblock-statement-body-position"
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22 | },
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23 |
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24 | fixable: "whitespace",
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25 |
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26 | schema: [
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27 | POSITION_SCHEMA,
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28 | {
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29 | properties: {
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30 | overrides: {
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31 | properties: {
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32 | if: POSITION_SCHEMA,
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33 | else: POSITION_SCHEMA,
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34 | while: POSITION_SCHEMA,
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35 | do: POSITION_SCHEMA,
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36 | for: POSITION_SCHEMA
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37 | },
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38 | additionalProperties: false
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39 | }
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40 | },
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41 | additionalProperties: false
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42 | }
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43 | ],
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44 |
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45 | messages: {
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46 | expectNoLinebreak: "Expected no linebreak before this statement.",
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47 | expectLinebreak: "Expected a linebreak before this statement."
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48 | }
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49 | },
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50 |
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51 | create(context) {
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52 | const sourceCode = context.getSourceCode();
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53 |
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54 |
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55 |
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56 |
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57 |
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58 | |
59 |
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60 |
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61 |
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62 |
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63 | function getOption(keywordName) {
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64 | return context.options[1] && context.options[1].overrides && context.options[1].overrides[keywordName] ||
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65 | context.options[0] ||
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66 | "beside";
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67 | }
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68 |
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69 | |
70 |
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71 |
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72 |
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73 |
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74 |
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75 | function validateStatement(node, keywordName) {
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76 | const option = getOption(keywordName);
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77 |
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78 | if (node.type === "BlockStatement" || option === "any") {
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79 | return;
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80 | }
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81 |
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82 | const tokenBefore = sourceCode.getTokenBefore(node);
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83 |
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84 | if (tokenBefore.loc.end.line === node.loc.start.line && option === "below") {
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85 | context.report({
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86 | node,
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87 | messageId: "expectLinebreak",
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88 | fix: fixer => fixer.insertTextBefore(node, "\n")
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89 | });
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90 | } else if (tokenBefore.loc.end.line !== node.loc.start.line && option === "beside") {
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91 | context.report({
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92 | node,
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93 | messageId: "expectNoLinebreak",
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94 | fix(fixer) {
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95 | if (sourceCode.getText().slice(tokenBefore.range[1], node.range[0]).trim()) {
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96 | return null;
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97 | }
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98 | return fixer.replaceTextRange([tokenBefore.range[1], node.range[0]], " ");
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99 | }
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100 | });
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101 | }
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102 | }
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103 |
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104 |
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105 |
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106 |
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107 |
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108 | return {
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109 | IfStatement(node) {
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110 | validateStatement(node.consequent, "if");
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111 |
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112 |
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113 | if (node.alternate && node.alternate.type !== "IfStatement") {
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114 | validateStatement(node.alternate, "else");
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115 | }
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116 | },
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117 | WhileStatement: node => validateStatement(node.body, "while"),
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118 | DoWhileStatement: node => validateStatement(node.body, "do"),
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119 | ForStatement: node => validateStatement(node.body, "for"),
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120 | ForInStatement: node => validateStatement(node.body, "for"),
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121 | ForOfStatement: node => validateStatement(node.body, "for")
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122 | };
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123 | }
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124 | };
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