1 | 'use strict';
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2 |
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3 | const declarationValueIndex = require('../../utils/declarationValueIndex');
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4 | const parseCalcExpression = require('../../utils/parseCalcExpression');
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5 | const report = require('../../utils/report');
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6 | const ruleMessages = require('../../utils/ruleMessages');
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7 | const validateOptions = require('../../utils/validateOptions');
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8 | const valueParser = require('postcss-value-parser');
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9 |
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10 | const ruleName = 'function-calc-no-invalid';
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11 |
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12 | const messages = ruleMessages(ruleName, {
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13 | expectedExpression: () => 'Expected a valid expression',
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14 | expectedSpaceBeforeOperator: (operator) => `Expected space before "${operator}" operator`,
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15 | expectedSpaceAfterOperator: (operator) => `Expected space after "${operator}" operator`,
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16 | rejectedDivisionByZero: () => 'Unexpected division by zero',
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17 | expectedValidResolvedType: (operator) =>
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18 | `Expected to be compatible with the left and right argument types of "${operator}" operation.`,
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19 | });
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20 |
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21 | function rule(actual) {
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22 | return (root, result) => {
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23 | const validOptions = validateOptions(result, ruleName, { actual });
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24 |
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25 | if (!validOptions) {
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26 | return;
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27 | }
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28 |
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29 | root.walkDecls((decl) => {
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30 | const checked = [];
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31 |
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32 | valueParser(decl.value).walk((node) => {
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33 | if (node.type !== 'function' || node.value.toLowerCase() !== 'calc') {
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34 | return;
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35 | }
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36 |
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37 | if (checked.includes(node)) {
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38 | return;
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39 | }
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40 |
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41 | checked.push(...getCalcNodes(node));
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42 |
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43 | checked.push(...node.nodes);
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44 |
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45 | let ast;
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46 |
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47 | try {
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48 | ast = parseCalcExpression(valueParser.stringify(node));
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49 | } catch (e) {
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50 | if (e.hash && e.hash.loc) {
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51 | complain(messages.expectedExpression(), node.sourceIndex + e.hash.loc.range[0]);
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52 |
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53 | return;
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54 | }
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55 |
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56 | throw e;
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57 | }
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58 |
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59 | verifyMathExpressions(ast, node);
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60 | });
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61 |
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62 | function complain(message, valueIndex) {
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63 | report({
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64 | message,
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65 | node: decl,
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66 | index: declarationValueIndex(decl) + valueIndex,
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67 | result,
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68 | ruleName,
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69 | });
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70 | }
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71 |
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72 | |
73 |
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74 |
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75 |
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76 |
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77 |
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78 |
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79 | function verifyMathExpressions(expression, node) {
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80 | if (expression.type === 'MathExpression') {
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81 | const { operator, left, right } = expression;
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82 |
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83 | if (operator === '+' || operator === '-') {
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84 | if (expression.source.operator.end.index === right.source.start.index) {
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85 | complain(
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86 | messages.expectedSpaceAfterOperator(operator),
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87 | node.sourceIndex + expression.source.operator.end.index,
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88 | );
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89 | }
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90 |
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91 | if (expression.source.operator.start.index === left.source.end.index) {
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92 | complain(
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93 | messages.expectedSpaceBeforeOperator(operator),
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94 | node.sourceIndex + expression.source.operator.start.index,
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95 | );
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96 | }
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97 | } else if (operator === '/') {
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98 | if (
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99 | (right.type === 'Value' && right.value === 0) ||
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100 | (right.type === 'MathExpression' && getNumber(right) === 0)
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101 | ) {
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102 | complain(
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103 | messages.rejectedDivisionByZero(),
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104 | node.sourceIndex + expression.source.operator.end.index,
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105 | );
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106 | }
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107 | }
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108 |
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109 | if (getResolvedType(expression) === 'invalid') {
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110 | complain(
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111 | messages.expectedValidResolvedType(operator),
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112 | node.sourceIndex + expression.source.operator.start.index,
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113 | );
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114 | }
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115 |
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116 | verifyMathExpressions(expression.left, node);
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117 | verifyMathExpressions(expression.right, node);
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118 | }
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119 | }
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120 | });
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121 | };
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122 | }
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123 |
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124 | function getCalcNodes(node) {
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125 | if (node.type !== 'function') {
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126 | return [];
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127 | }
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128 |
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129 | const functionName = node.value.toLowerCase();
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130 | const result = [];
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131 |
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132 | if (functionName === 'calc') {
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133 | result.push(node);
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134 | }
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135 |
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136 | if (!functionName || functionName === 'calc') {
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137 |
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138 | for (const c of node.nodes) {
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139 | result.push(...getCalcNodes(c));
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140 | }
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141 | }
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142 |
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143 | return result;
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144 | }
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145 |
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146 | function getNumber(mathExpression) {
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147 | const { left, right } = mathExpression;
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148 |
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149 | const leftValue =
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150 | left.type === 'Value' ? left.value : left.type === 'MathExpression' ? getNumber(left) : null;
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151 | const rightValue =
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152 | right.type === 'Value'
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153 | ? right.value
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154 | : right.type === 'MathExpression'
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155 | ? getNumber(right)
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156 | : null;
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157 |
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158 |
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159 | if (leftValue == null || rightValue == null) {
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160 | return null;
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161 | }
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162 |
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163 | switch (mathExpression.operator) {
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164 | case '+':
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165 | return leftValue + rightValue;
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166 | case '-':
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167 | return leftValue - rightValue;
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168 | case '*':
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169 | return leftValue * rightValue;
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170 | case '/':
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171 | return leftValue / rightValue;
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172 | }
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173 |
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174 | return null;
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175 | }
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176 |
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177 | function getResolvedType(mathExpression) {
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178 | const { left: leftExpression, operator, right: rightExpression } = mathExpression;
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179 | let left =
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180 | leftExpression.type === 'MathExpression'
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181 | ? getResolvedType(leftExpression)
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182 | : leftExpression.type;
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183 | let right =
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184 | rightExpression.type === 'MathExpression'
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185 | ? getResolvedType(rightExpression)
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186 | : rightExpression.type;
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187 |
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188 | if (left === 'Function' || left === 'invalid') {
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189 | left = 'UnknownValue';
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190 | }
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191 |
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192 | if (right === 'Function' || right === 'invalid') {
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193 | right = 'UnknownValue';
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194 | }
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195 |
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196 | switch (operator) {
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197 | case '+':
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198 | case '-':
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199 | if (left === 'UnknownValue' || right === 'UnknownValue') {
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200 | return 'UnknownValue';
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201 | }
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202 |
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203 | if (left === right) {
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204 | return left;
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205 | }
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206 |
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207 | if (left === 'Value' || right === 'Value') {
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208 | return 'invalid';
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209 | }
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210 |
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211 | if (left === 'PercentageValue') {
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212 | return right;
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213 | }
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214 |
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215 | if (right === 'PercentageValue') {
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216 | return left;
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217 | }
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218 |
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219 | return 'invalid';
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220 | case '*':
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221 | if (left === 'UnknownValue' || right === 'UnknownValue') {
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222 | return 'UnknownValue';
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223 | }
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224 |
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225 | if (left === 'Value') {
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226 | return right;
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227 | }
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228 |
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229 | if (right === 'Value') {
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230 | return left;
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231 | }
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232 |
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233 | return 'invalid';
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234 | case '/':
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235 | if (right === 'UnknownValue') {
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236 | return 'UnknownValue';
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237 | }
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238 |
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239 | if (right === 'Value') {
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240 | return left;
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241 | }
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242 |
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243 | return 'invalid';
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244 | }
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245 |
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246 | return 'UnknownValue';
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247 | }
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248 |
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249 | rule.ruleName = ruleName;
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250 | rule.messages = messages;
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251 | module.exports = rule;
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