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util.js
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util.js
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/* Copyright (c) 2012-2016 LevelUP contributors
* See list at <https://github.com/level/levelup#contributing>
* MIT License
* <https://github.com/level/levelup/blob/master/LICENSE.md>
*/
var extend = require('xtend')
, LevelUPError = require('level-errors').LevelUPError
, format = require('util').format
, defaultOptions = {
createIfMissing : true
, errorIfExists : false
, keyEncoding : 'utf8'
, valueEncoding : 'utf8'
, compression : true
}
, leveldown
function getOptions (options) {
if (typeof options == 'string')
options = { valueEncoding: options }
if (typeof options != 'object')
options = {}
return options
}
function getLevelDOWN () {
if (leveldown)
return leveldown
var requiredVersion = require('../package.json').devDependencies.leveldown
, leveldownVersion
try {
leveldownVersion = require('leveldown/package.json').version
} catch (e) {
throw requireError(e)
}
if (!require('semver').satisfies(leveldownVersion, requiredVersion)) {
throw new LevelUPError(
'Installed version of LevelDOWN ('
+ leveldownVersion
+ ') does not match required version ('
+ requiredVersion
+ ')'
)
}
try {
return leveldown = require('leveldown')
} catch (e) {
throw requireError(e)
}
}
function requireError (e) {
var template = 'Failed to require LevelDOWN (%s). Try `npm install leveldown` if it\'s missing'
return new LevelUPError(format(template, e.message))
}
function dispatchError (db, error, callback) {
typeof callback == 'function' ? callback(error) : db.emit('error', error)
}
function isDefined (v) {
return typeof v !== 'undefined'
}
module.exports = {
defaultOptions : defaultOptions
, getOptions : getOptions
, getLevelDOWN : getLevelDOWN
, dispatchError : dispatchError
, isDefined : isDefined
}