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* @license Apache-2.0
*
* Copyright (c) 2018 The Stdlib Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
'use strict';
// MODULES //
var isString = require( '@stdlib/assert/is-string' ).isPrimitive;
var isObject = require( '@stdlib/assert/is-plain-object' );
var isFunction = require( '@stdlib/assert/is-function' );
var readFile = require( '@stdlib/fs/read-file' );
var removeBOM = require( '@stdlib/string/remove-utf8-bom' );
var parseJSON = require( '@stdlib/utils/parse-json' );
var instanceOf = require( '@stdlib/assert/instance-of' );
var format = require( '@stdlib/string/format' );
// MAIN //
/**
* Asynchronously reads a file as JSON.
*
* @param {(string|Buffer|integer)} file - file path or file descriptor
* @param {(Options|string)} [options] - options
* @param {(string|null)} [options.encoding] - file encoding
* @param {string} [options.flag] - file status flag
* @param {Function} [options.reviver] - JSON reviver
* @param {Callback} clbk - callback
* @throws {TypeError} options argument must be either a string or an object
* @throws {TypeError} callback argument must be a function
*
* @example
* var resolve = require( 'path' ).resolve;
*
* readJSON( resolve( __dirname, '..', 'package.json' ), onJSON );
*
* function onJSON( error, data ) {
* if ( error ) {
* console.error( error.message );
* }
* console.dir( data );
* }
*/
function readJSON( file, options, clbk ) {
var opts;
var done;
if ( arguments.length < 3 ) {
opts = {};
done = options;
} else {
if ( isString( options ) ) {
opts = {
'encoding': options
};
} else {
if ( !isObject( options ) ) {
throw new TypeError( format( 'invalid argument. Options argument must be either a string or an object. Value: `%s`.', options ) );
}
opts = options;
}
done = clbk;
}
if ( !isFunction( done ) ) {
throw new TypeError( format( 'invalid argument. Callback argument must be a function. Value: `%s`.', done ) );
}
readFile( file, opts, onRead );
/**
* Callback invoked upon reading a file.
*
* @private
* @param {(Error|null)} error - error object
* @param {(Buffer|string)} file - file contents
* @returns {void}
*/
function onRead( error, file ) {
if ( error ) {
return done( error );
}
file = file.toString();
if ( opts.encoding === 'utf8' ) {
file = removeBOM( file );
}
if ( opts.reviver ) {
file = parseJSON( file, opts.reviver );
} else {
file = parseJSON( file );
}
if ( instanceOf( file, Error ) ) {
return done( file );
}
done( null, file );
}
}
// EXPORTS //
module.exports = readJSON;
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