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/**
* Utility for checking and validating JavaScript values.
*
* @private
* @module util/is
*/
const hasOwn = Object.prototype.hasOwnProperty;
const objToString = Object.prototype.toString;
class Validation extends Error {
constructor( message, inputName ) {
super( message );
this.name = `Validation${( inputName ? ` of ${inputName}` : '' )}`;
}
}
/**
* @ignore
* @param {Mixed} value
* @return {boolean}
*/
function plainObject( value ) {
// Reject null, undefined, and various built-in types
if ( !value || objToString.call( value ) !== '[object Object]' ) {
return false;
}
// Reject instances of anything other than direct Object.prototype
// (e.g. from an object literal) or Object.create( null ).
const proto = Object.getPrototypeOf( value );
return ( proto === null || proto === Object.prototype );
}
/**
* @ignore
* @param {Mixed} value
* @return {string}
*/
function type( value ) {
if ( Array.isArray( value ) ) {
return 'array';
}
if ( plainObject( value ) ) {
return 'object';
}
if ( value === null ) {
return 'null';
}
const of = typeof value;
switch ( of ) {
case 'undefined':
case 'boolean':
case 'number':
case 'string':
case 'symbol':
case 'function':
return of;
case 'object':
default:
return 'unknown';
}
}
/**
* Validate an object's shape.
*
* Supports primitives and JSON-compatible structures (array, plain object).
*
* @param {Object|undefined} value
* @param {Object} shape
* @param {string} [name]
* @throws {Error} If invalid
*/
function like( value, shape, name ) {
if ( !plainObject( value ) ) {
throw new Validation( 'Non-object', name );
}
for ( const key in shape ) {
const expected = shape[ key ];
const actual = type( value[ key ] );
if ( Array.isArray( expected ) ) {
if ( expected.indexOf( actual ) === -1 ) {
throw new Validation( `Expected "${key}" as ${expected.join( '|' )}, got ${actual}`, name );
}
} else if ( actual !== expected ) {
throw new Validation( `Expected "${key}" as ${expected}, got ${actual}`, name );
}
}
for ( const key in value ) {
if ( !hasOwn.call( shape, key ) ) {
throw new Validation( `Unexpected key "${key}"`, name );
}
}
}
/**
* Whether a given value is a valid Fresnel scenario.
*
* @param {Object} value
* @throws {Error} If invalid
*/
function scenario( value ) {
like( value, {
url: 'string',
viewport: 'object',
reports: [ 'array', 'undefined' ],
probes: [ 'array', 'undefined' ]
}, 'scenario' );
like( value.viewport, {
height: 'number',
width: 'number'
}, 'scenario.viewport' );
}
/**
* Whether a given value is a valid Fresnel configuration object.
*
* @param {Object} value
* @throws {Error} If invalid
*/
function config( value ) {
like( value, {
warmup: 'boolean',
runs: 'number',
scenarios: [ 'object', 'array' ]
}, 'config' );
for ( const key in value.scenarios ) {
scenario( value.scenarios[ key ] );
}
}
module.exports = { like, scenario, config };
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