parameter-validator.js
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var cJSON = require('circular-json')
, _ = require('lodash') // Don't require Utils here, as it creates a circular dependency
var ParameterValidator = module.exports = {
check: function(value, expectation, options) {
options = _.extend({
throwError: true,
deprecated: false,
deprecationWarning: generateDeprecationWarning(value, expectation, options),
onDeprecated: function(s) { console.log('DEPRECATION WARNING:', s) },
index: null,
method: null,
optional: false
}, options || {})
if (options.optional && ((value === undefined) || (value === null)) ) {
return true
}
if (value === undefined) {
throw new Error('No value has been passed.')
}
if (expectation === undefined) {
throw new Error('No expectation has been passed.')
}
return false
|| validateDeprication(value, expectation, options)
|| validate(value, expectation, options)
}
}
var generateDeprecationWarning = function(value, expectation, options) {
options = options || {}
if (options.method && options.index) {
return [
'The',
{1:'first',2:'second',3:'third',4:'fourth',5:'fifth'}[options.index],
'parameter of',
options.method,
'should be a',
extractClassName(expectation) + '!'
].join(" ")
} else {
return ["Expected", cJSON.stringify(value), "to be", extractClassName(expectation) + '!'].join(" ")
}
}
var matchesExpectation = function(value, expectation) {
if (typeof expectation === 'string') {
return (typeof value === expectation.toString())
} else {
return (value instanceof expectation)
}
}
var validateDeprication = function(value, expectation, options) {
if (options.deprecated) {
if (matchesExpectation(value, options.deprecated)) {
options.onDeprecated(options.deprecationWarning)
return true
}
}
}
var validate = function(value, expectation, options) {
var result = matchesExpectation(value, expectation)
if (result) {
return result
} else if (!options.throwError) {
return false
} else {
var _value = (value === null) ? 'null' : value.toString()
, _expectation = extractClassName(expectation)
throw new Error('The parameter (value: ' + _value + ') is no ' + _expectation + '.')
}
}
var extractClassName = function(o) {
if (typeof o === 'string') {
return o
} else if (!!o) {
return o.toString().match(/function ([^\(]+)/)[1]
} else {
return 'undefined'
}
}