2a09d1a4
 liuqimichale
添加宜春 天水 宣化
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var Individual = require('individual')
var VERSION_KEY = '1';
var ERROR_CACHE_KEY = '__RUST_RESULT_ERROR_UUID@' + VERSION_KEY
var OK_CACHE_KEY = '__RUST_RESULT_OK_UUID@' + VERSION_KEY
var ERROR_UUID = Individual(ERROR_CACHE_KEY, fakeUUID('Error'))
var OK_UUID = Individual(OK_CACHE_KEY, fakeUUID('Ok'))
function Ok(v) {
this.v = v
this[OK_UUID] = true
}
function Err(err) {
this.err = err
this[ERROR_UUID] = true
}
function createOk(v) {
if (isObject(v) && OK_UUID in v) {
return v.v
} else if (isObject(v) && ERROR_UUID in v) {
return undefined
} else {
if (v === undefined) {
throw Error('rust-result: Cannot box `undefined` in Result.Ok')
}
return new Ok(v)
}
}
function createErr(err) {
if (isObject(err) && ERROR_UUID in err) {
return err.err
} else if (isObject(err) && OK_UUID in err) {
return undefined
} else {
if (!isError(err)) {
throw Error('rust-result: Cannot box a non-error in Result.Err')
}
return new Err(err)
}
}
function isOk(v) {
return createOk(v) !== undefined
}
function isErr(err) {
return createErr(err) !== undefined
}
module.exports = {
isOk: isOk,
Ok: createOk,
isErr: isErr,
Err: createErr
}
function fakeUUID(word) {
return 'rust-result:' + word + ':' +
Math.random().toString(32).slice(2) + ':' +
Math.random().toString(32).slice(2) + ':' +
Math.random().toString(32).slice(2) + ':' +
Math.random().toString(32).slice(2) + ':'
}
function isObject(o) {
return typeof o === 'object' && o !== null
}
function isError(e) {
return isObject(e) &&
(Object.prototype.toString.call(e) === '[object Error]' ||
/* istanbul ignore next */ e instanceof Error)
}
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