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4 |
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5 | "use strict";
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6 |
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7 |
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8 |
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9 |
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10 |
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11 | const astUtils = require("../ast-utils");
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12 |
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13 |
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14 |
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15 |
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16 |
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17 | module.exports = {
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18 | meta: {
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19 | docs: {
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20 | description: "enforce a maximum number of statements allowed per line",
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21 | category: "Stylistic Issues",
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22 | recommended: false,
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23 | url: "https://eslint.org/docs/rules/max-statements-per-line"
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24 | },
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25 |
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26 | schema: [
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27 | {
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28 | type: "object",
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29 | properties: {
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30 | max: {
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31 | type: "integer",
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32 | minimum: 1
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33 | }
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34 | },
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35 | additionalProperties: false
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36 | }
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37 | ]
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38 | },
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39 |
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40 | create(context) {
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41 |
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42 | const sourceCode = context.getSourceCode(),
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43 | options = context.options[0] || {},
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44 | maxStatementsPerLine = typeof options.max !== "undefined" ? options.max : 1,
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45 | message = "This line has {{numberOfStatementsOnThisLine}} {{statements}}. Maximum allowed is {{maxStatementsPerLine}}.";
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46 |
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47 | let lastStatementLine = 0,
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48 | numberOfStatementsOnThisLine = 0,
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49 | firstExtraStatement;
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50 |
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51 |
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52 |
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53 |
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54 |
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55 | const SINGLE_CHILD_ALLOWED = /^(?:(?:DoWhile|For|ForIn|ForOf|If|Labeled|While)Statement|Export(?:Default|Named)Declaration)$/;
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56 |
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57 | |
58 |
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59 |
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60 |
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61 |
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62 | function reportFirstExtraStatementAndClear() {
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63 | if (firstExtraStatement) {
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64 | context.report({
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65 | node: firstExtraStatement,
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66 | message,
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67 | data: {
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68 | numberOfStatementsOnThisLine,
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69 | maxStatementsPerLine,
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70 | statements: numberOfStatementsOnThisLine === 1 ? "statement" : "statements"
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71 | }
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72 | });
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73 | }
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74 | firstExtraStatement = null;
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75 | }
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76 |
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77 | |
78 |
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79 |
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80 |
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81 |
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82 |
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83 | function getActualLastToken(node) {
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84 | return sourceCode.getLastToken(node, astUtils.isNotSemicolonToken);
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85 | }
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86 |
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87 | |
88 |
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89 |
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90 |
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91 |
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92 |
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93 |
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94 | function enterStatement(node) {
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95 | const line = node.loc.start.line;
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96 |
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97 | |
98 |
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99 |
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100 |
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101 |
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102 | if (SINGLE_CHILD_ALLOWED.test(node.parent.type) &&
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103 | node.parent.alternate !== node
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104 | ) {
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105 | return;
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106 | }
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107 |
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108 |
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109 | if (line === lastStatementLine) {
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110 | numberOfStatementsOnThisLine += 1;
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111 | } else {
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112 | reportFirstExtraStatementAndClear();
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113 | numberOfStatementsOnThisLine = 1;
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114 | lastStatementLine = line;
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115 | }
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116 |
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117 |
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118 | if (numberOfStatementsOnThisLine === maxStatementsPerLine + 1) {
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119 | firstExtraStatement = firstExtraStatement || node;
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120 | }
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121 | }
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122 |
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123 | |
124 |
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125 |
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126 |
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127 |
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128 |
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129 | function leaveStatement(node) {
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130 | const line = getActualLastToken(node).loc.end.line;
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131 |
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132 |
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133 | if (line !== lastStatementLine) {
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134 | reportFirstExtraStatementAndClear();
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135 | numberOfStatementsOnThisLine = 1;
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136 | lastStatementLine = line;
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137 | }
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138 | }
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139 |
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140 |
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141 |
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142 |
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143 |
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144 | return {
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145 | BreakStatement: enterStatement,
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146 | ClassDeclaration: enterStatement,
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147 | ContinueStatement: enterStatement,
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148 | DebuggerStatement: enterStatement,
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149 | DoWhileStatement: enterStatement,
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150 | ExpressionStatement: enterStatement,
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151 | ForInStatement: enterStatement,
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152 | ForOfStatement: enterStatement,
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153 | ForStatement: enterStatement,
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154 | FunctionDeclaration: enterStatement,
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155 | IfStatement: enterStatement,
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156 | ImportDeclaration: enterStatement,
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157 | LabeledStatement: enterStatement,
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158 | ReturnStatement: enterStatement,
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159 | SwitchStatement: enterStatement,
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160 | ThrowStatement: enterStatement,
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161 | TryStatement: enterStatement,
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162 | VariableDeclaration: enterStatement,
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163 | WhileStatement: enterStatement,
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164 | WithStatement: enterStatement,
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165 | ExportNamedDeclaration: enterStatement,
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166 | ExportDefaultDeclaration: enterStatement,
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167 | ExportAllDeclaration: enterStatement,
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168 |
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169 | "BreakStatement:exit": leaveStatement,
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170 | "ClassDeclaration:exit": leaveStatement,
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171 | "ContinueStatement:exit": leaveStatement,
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172 | "DebuggerStatement:exit": leaveStatement,
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173 | "DoWhileStatement:exit": leaveStatement,
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174 | "ExpressionStatement:exit": leaveStatement,
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175 | "ForInStatement:exit": leaveStatement,
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176 | "ForOfStatement:exit": leaveStatement,
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177 | "ForStatement:exit": leaveStatement,
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178 | "FunctionDeclaration:exit": leaveStatement,
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179 | "IfStatement:exit": leaveStatement,
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180 | "ImportDeclaration:exit": leaveStatement,
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181 | "LabeledStatement:exit": leaveStatement,
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182 | "ReturnStatement:exit": leaveStatement,
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183 | "SwitchStatement:exit": leaveStatement,
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184 | "ThrowStatement:exit": leaveStatement,
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185 | "TryStatement:exit": leaveStatement,
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186 | "VariableDeclaration:exit": leaveStatement,
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187 | "WhileStatement:exit": leaveStatement,
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188 | "WithStatement:exit": leaveStatement,
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189 | "ExportNamedDeclaration:exit": leaveStatement,
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190 | "ExportDefaultDeclaration:exit": leaveStatement,
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191 | "ExportAllDeclaration:exit": leaveStatement,
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192 | "Program:exit": reportFirstExtraStatementAndClear
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193 | };
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194 | }
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195 | };
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