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39 lines
1.1 KiB
39 lines
1.1 KiB
'use strict'; |
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Object.defineProperty(exports, "__esModule", { |
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value: true |
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}); |
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exports.default = extractValueFromUnaryExpression; |
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/** |
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* Extractor function for a UnaryExpression type value node. |
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* A unary expression is an expression with a unary operator. |
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* For example, !"foobar" will evaluate to false, so this will return false. |
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* |
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* @param - value - AST Value object with type `UnaryExpression` |
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* @returns - The extracted value converted to correct type. |
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*/ |
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function extractValueFromUnaryExpression(value) { |
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// eslint-disable-next-line global-require |
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var getValue = require('.').default; |
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var operator = value.operator, |
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argument = value.argument; |
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switch (operator) { |
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case '-': |
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return -getValue(argument); |
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case '+': |
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return +getValue(argument); // eslint-disable-line no-implicit-coercion |
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case '!': |
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return !getValue(argument); |
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case '~': |
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return ~getValue(argument); // eslint-disable-line no-bitwise |
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case 'delete': |
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// I believe delete statements evaluate to true. |
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return true; |
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case 'typeof': |
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case 'void': |
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default: |
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return undefined; |
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} |
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} |