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