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number-precision.macro.js
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const { createMacro, MacroError } = require('babel-plugin-macros')
// 顶部增加import
const addImport = (defaultImport, babel, key, value) => {
if (defaultImport.length <= 0) return
let program = defaultImport[0].parentPath
while (program.parentPath) {
program = program.parentPath
}
const programBody = program.node.body
const { types } = babel
if (!programBody.find(x => x.source && x.source.value === value)) {
//没有import则import
// import key from value
programBody.unshift(
types.ImportDeclaration(
[types.importDefaultSpecifier(types.identifier(key))],
types.stringLiteral(value)
)
)
}
}
const callExpression = (types, object, property, ...args) => {
return types.callExpression(
types.memberExpression(
types.identifier(object),
types.identifier(property)
),
args
)
}
const isValidNumber = (types, value) => {
// !isNaN(value) && value !== ''
return types.logicalExpression(
'&&',
types.unaryExpression(
'!',
types.callExpression(types.identifier('isNaN'), [value])
),
types.binaryExpression('!==', value, types.stringLiteral(''))
)
}
const isExpressionInvalid = (types, expression) => {
if (expression.type === 'BinaryExpression') {
return types.logicalExpression(
'&&',
isExpressionInvalid(types, expression.left),
isExpressionInvalid(types, expression.right)
)
} else {
return isValidNumber(types, expression)
}
}
const toNumber = (types, number) => {
return types.callExpression(types.identifier('Number'), [number])
}
const NPOperators = (types, operator, _left, _right) => {
const left = toNumber(types, _left)
const right = toNumber(types, _right)
switch (operator) {
//NP.times(Number(_left), Number(_right))
case '*':
return callExpression(types, 'NP', 'times', left, right)
//NP.divide(Number(_left), Number(_right))
case '/':
return callExpression(types, 'NP', 'divide', left, right)
//Number(_left) % Number(_right)
case '%':
return types.binaryExpression('%', left, right)
//Math.pow(Number(_left), Number(_right))
case '^':
return callExpression(types, 'Math', 'pow', left, right)
//Math.pow(Number(_left), Number(_right))
case '**':
return callExpression(types, 'Math', 'pow', left, right)
//NP.plus(Number(_left), Number(_right))
case '+':
return callExpression(types, 'NP', 'plus', left, right)
//NP.minus(Number(_left), Number(_right))
case '-':
return callExpression(types, 'NP', 'minus', left, right)
}
}
const expression2NP = (types, expression) => {
if (expression.type === 'BinaryExpression') {
return NPOperators(
types,
expression.operator,
expression2NP(types, expression.left),
expression2NP(types, expression.right)
)
} else {
return expression
}
}
// 结果后处理
const postHandler = (types, result, arg) => {
if (
arg &&
arg.type !== 'NullLiteral' && // null
!(arg.type === 'Identifier' && arg.name === 'undefined') && // undefined
!(arg.type === 'StringLiteral' && arg.value === '') // ''
) {
//NP.round(NP.divide(13413.64, 100), 2)
if (
arg.type === 'StringLiteral' &&
(arg.value === 'yuan' || arg.value === '元')
) {
return callExpression(
types,
'NP',
'round',
callExpression(
types,
'NP',
'divide',
toNumber(types, result),
types.numericLiteral(100)
),
types.numericLiteral(2)
)
} else if (arg.type === 'StringLiteral' && arg.value === '%') {
return types.binaryExpression(
'+',
callExpression(
types,
'NP',
'round',
callExpression(
types,
'NP',
'divide',
toNumber(types, result),
types.numericLiteral(100)
),
types.numericLiteral(2)
),
types.stringLiteral('%')
)
} else {
return types.callExpression(arg, [toNumber(types, result)]) // arg(NP.plus(1, 1 % 2))
}
} else {
return result // NP.plus(1, 1 % 2)
}
}
function macro({ references, babel }) {
// 获取默认导出的所有引用
const defaultImport = references.NPM || references.default
const { types } = babel
addImport(defaultImport, babel, 'NP', 'number-precision') //TODO 仅针对有用到NP的import
// 遍历引用并进行求值
defaultImport.forEach(referencePath => {
// 作为函数调用
if (
referencePath.key === 'callee' &&
referencePath.parentPath.type === 'CallExpression'
) {
const node = referencePath.parentPath.node
const [
arg0, // 表达式
arg1, // 表达式结果后处理或单位如'yuan'
arg2 // 非法时默认值
] = node.arguments
referencePath.parentPath.replaceWith(
types.conditionalExpression(
isExpressionInvalid(types, arg0), //!isNaN(1) && 1 !== "" && !isNaN(1) && 1 !== "" && !isNaN(2) && 2 !== ""
postHandler(types, expression2NP(types, arg0), arg1),
arg2 || types.stringLiteral('--') //: "--"
)
)
} else {
// 其他情况连同父节点一并替换为未定义
referencePath.parentPath.replaceWith(types.identifier('undefined'))
}
})
}
/**
* 使用[babel macro](https://github.com/kentcdodds/babel-plugin-macros)实现的[number-precision](https://github.com/nefe/number-precision)的js表达式语法糖，NPM(expression, postHandler, fallback)
* @function NPM(expression, postHandler, fallback)
* @param {Expression} expression - 普通js表达式如 (1 + 1)-3%2，支持 () 及运算符 + - * \/ ^ ** %
* @param {String | Function | Null | Undefined} postHandler - expression使用NP执行后的后处理，内置有'%'（除以100后四舍五入加百分号），'yuan'（除以100后四舍五入），'元'（除以100后四舍五入），null或''或undefined（无后处理）
* @param {String} fallback - 任意expression中的操作数isNaN或是空字符串时显示兜底显示内容
* @return {Number | String} - 返回表达式结果或者错误兜底内容
* @example NPM((1 + 1) - 3 % 2) // 结果为 2
* // 编译后等价于 !isNaN(1) && 1 !== "" && !isNaN(1) && 1 !== "" && !isNaN(3) && 3 !== "" && !isNaN(2) && 2 !== "" ? NP.minus(Number(NP.plus(Number(1), Number(1))), Number(Number(3) % Number(2))) : "--"
* @example NPM(1.341324, (x: number) => NP.round(x, 2)) // 结果为 1.34
* // 编译后等价于 !isNaN(1.341324) && 1.341324 !== "" ? function (x) { return NP.round(x, 2) }(Number(1.341324)) : "--"
* @example NPM(13413.64, 'yuan') // 结果为 134.14
* // 内置的 'yuan' 后处理等价于 NP.round(NP.divide(x, 100), 2)
* // 编译后等价于 !isNaN(13413.64) && 13413.64 !== "" ? NP.round(NP.divide(Number(13413.64), 100), 2) : "--"
* @example NPM(13413.64, '元') // 结果为 134.14
* // 内置的 '元' 后处理等价于 NP.round(NP.divide(x, 100), 2)
* // 编译后等价于 !isNaN(13413.64) && 13413.64 !== "" ? NP.round(NP.divide(Number(13413.64), 100), 2) : "--"
* @example NPM(13413.64, '%')) // 结果为 '134.14%'
* // 内置的 '%' 后处理等价于 NP.round(NP.divide(13413.64, 100), 2) + '%'
* // 编译后等价于 !isNaN(13413.64) && 13413.64 !== "" ? NP.round(NP.divide(Number(13413.64), 100), 2) + "%" : "--"
* @example NPM(-1.341324, Math.abs)) // 结果为 1.34
* // 传入自定义后处理函数 Math.abs
* // 编译后等价于 !isNaN(-1.341324) && -1.341324 !== "" ? Math.abs(Number(-1.341324)) : "--"
* @example var a = ''; NPM(1 + a) // 结果为 --
* // 编译后等价于 !isNaN(1) && 1 !== "" && !isNaN(a) && a !== "" ? NP.plus(Number(1), Number(a)) : "--"
* @example var a = ''; NPM(1 + a/2 + Math.abs(1), '', '**') // 结果为 **
* // 编译后等价于 !isNaN(1) && 1 !== "" && !isNaN(a) && a !== "" && !isNaN(2) && 2 !== "" && !isNaN(Math.abs(1)) && Math.abs(1) !== "" ? NP.plus(Number(NP.plus(Number(1), Number(NP.divide(Number(a), Number(2))))), Number(Math.abs(1))) : '**'
*/
const NPM = createMacro(macro)
module.exports = NPM
exports.NPM = NPM