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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,170 @@ | ||
| 'use strict'; | ||
| const {getStaticValue} = require('eslint-utils'); | ||
|
|
||
| const isStaticProperties = (node, object, properties) => | ||
| node.type === 'MemberExpression' | ||
| && !node.computed | ||
| && !node.optional | ||
| && node.object.type === 'Identifier' | ||
| && node.object.name === object | ||
| && node.property.type === 'Identifier' | ||
| && properties.has(node.property.name); | ||
| const isFunctionCall = (node, functionName) => node.type === 'CallExpression' | ||
| && !node.optional | ||
| && node.callee.type === 'Identifier' | ||
| && node.callee.name === functionName; | ||
|
|
||
| // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math#static_properties | ||
| const mathProperties = new Set([ | ||
| 'E', | ||
| 'LN2', | ||
| 'LN10', | ||
| 'LOG2E', | ||
| 'LOG10E', | ||
| 'PI', | ||
| 'SQRT1_2', | ||
| 'SQRT2', | ||
| ]); | ||
|
|
||
| // `Math.{E,LN2,LN10,LOG2E,LOG10E,PI,SQRT1_2,SQRT2}` | ||
| const isMathProperty = node => isStaticProperties(node, 'Math', mathProperties); | ||
|
|
||
| // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math#static_methods | ||
| const mathMethods = new Set([ | ||
| 'abs', | ||
| 'acos', | ||
| 'acosh', | ||
| 'asin', | ||
| 'asinh', | ||
| 'atan', | ||
| 'atanh', | ||
| 'atan2', | ||
| 'cbrt', | ||
| 'ceil', | ||
| 'clz32', | ||
| 'cos', | ||
| 'cosh', | ||
| 'exp', | ||
| 'expm1', | ||
| 'floor', | ||
| 'fround', | ||
| 'hypot', | ||
| 'imul', | ||
| 'log', | ||
| 'log1p', | ||
| 'log10', | ||
| 'log2', | ||
| 'max', | ||
| 'min', | ||
| 'pow', | ||
| 'random', | ||
| 'round', | ||
| 'sign', | ||
| 'sin', | ||
| 'sinh', | ||
| 'sqrt', | ||
| 'tan', | ||
| 'tanh', | ||
| 'trunc', | ||
| ]); | ||
| // `Math.{abs, …, trunc}(…)` | ||
| const isMathMethodCall = node => | ||
| node.type === 'CallExpression' | ||
| && !node.optional | ||
| && isStaticProperties(node.callee, 'Math', mathMethods); | ||
|
|
||
| // `Number(…)` | ||
| const isNumberCall = node => isFunctionCall(node, 'Number'); | ||
|
|
||
| // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number#static_properties | ||
| const numberProperties = new Set([ | ||
| 'EPSILON', | ||
| 'MAX_SAFE_INTEGER', | ||
| 'MAX_VALUE', | ||
| 'MIN_SAFE_INTEGER', | ||
| 'MIN_VALUE', | ||
| 'NaN', | ||
| 'NEGATIVE_INFINITY', | ||
| 'POSITIVE_INFINITY', | ||
| ]); | ||
| const isNumberProperty = node => isStaticProperties(node, 'Number', numberProperties); | ||
|
|
||
| // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number#static_methods | ||
| const numberMethods = new Set([ | ||
| 'parseFloat', | ||
| 'parseInt', | ||
| ]); | ||
| const isNumberMethodCall = node => | ||
| node.type === 'CallExpression' | ||
| && !node.optional | ||
| && isStaticProperties(node.callee, 'Number', numberMethods); | ||
| const isGlobalParseToNumberFunctionCall = node => isFunctionCall(node, 'parseInt') || isFunctionCall(node, 'parseFloat'); | ||
|
|
||
| // `+x`, `-x` | ||
| const numberUnaryOperators = new Set(['-', '+', '~']); | ||
| const isNumberUnaryExpression = node => | ||
| node.type === 'UnaryExpression' | ||
| && node.prefix | ||
| && numberUnaryOperators.has(node.operator); | ||
|
|
||
| const isStaticNumber = (node, scope) => { | ||
| const staticResult = getStaticValue(node, scope); | ||
| return staticResult !== null && typeof staticResult.value === 'number'; | ||
| }; | ||
|
|
||
| const isNumberLiteral = node => node.type === 'Literal' && typeof node.value === 'number'; | ||
| const isLengthProperty = node => | ||
| node.type === 'MemberExpression' | ||
| && !node.computed | ||
| && !node.optional | ||
| && node.property.type === 'Identifier' | ||
| && node.property.name === 'length'; | ||
|
|
||
| const mathOperators = new Set(['-', '*', '/', '%', '**', '<<', '>>', '>>>', '|', '^', '&']); | ||
| function isNumber(node, scope) { | ||
| if ( | ||
| isNumberLiteral(node) | ||
| || isMathProperty(node) | ||
| || isMathMethodCall(node) | ||
| || isNumberCall(node) | ||
| || isNumberProperty(node) | ||
| || isNumberMethodCall(node) | ||
| || isGlobalParseToNumberFunctionCall(node) | ||
| || isNumberUnaryExpression(node) | ||
| || isLengthProperty(node) | ||
| ) { | ||
| return true; | ||
| } | ||
|
|
||
| switch (node.type) { | ||
| case 'BinaryExpression': | ||
| case 'AssignmentExpression': { | ||
| let {operator} = node; | ||
|
|
||
| if (node.type === 'AssignmentExpression') { | ||
| operator = operator.slice(0, -1); | ||
| } | ||
|
|
||
| if (operator === '+') { | ||
| return isNumber(node.left, scope) && isNumber(node.right, scope); | ||
| } | ||
|
|
||
| // `a + b` can be `BigInt`, we need make sure at least one side is number | ||
| if (mathOperators.has(operator)) { | ||
| return isNumber(node.left, scope) || isNumber(node.right, scope); | ||
| } | ||
|
|
||
| break; | ||
| } | ||
|
|
||
| case 'ConditionalExpression': | ||
| return isNumber(node.consequent, scope) && isNumber(node.alternate, scope); | ||
| case 'SequenceExpression': | ||
| return isNumber(node.expressions[node.expressions.length - 1], scope); | ||
| // No default | ||
| } | ||
|
|
||
| return isStaticNumber(node, scope); | ||
| } | ||
|
|
||
| module.exports = isNumber; |
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