89 lines
2.4 KiB
JavaScript
89 lines
2.4 KiB
JavaScript
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/**
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* @license Apache-2.0
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*
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* Copyright (c) 2018 The Stdlib Authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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'use strict';
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// MODULES //
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var isString = require( '@stdlib/assert/is-string' ).isPrimitive;
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var isObject = require( '@stdlib/assert/is-plain-object' );
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var readFile = require( './../../read-file' ).sync;
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var removeBOM = require( '@stdlib/string/remove-utf8-bom' );
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var parseJSON = require( '@stdlib/utils/parse-json' );
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var instanceOf = require( '@stdlib/assert/instance-of' );
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// MAIN //
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/**
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* Synchronously reads a file as JSON.
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*
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* @param {(string|Buffer|integer)} file - file path or file descriptor
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* @param {(Options|string)} [options] - options
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* @param {(string|null)} [options.encoding] - file encoding
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* @param {string} [options.flag] - file status flag
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* @param {Function} [options.reviver] - JSON reviver
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* @throws {TypeError} options argument must be either a string or an object
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* @returns {(JSON|Error)} JSON or an error
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*
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* @example
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* var resolve = require( 'path' ).resolve;
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* var instanceOf = require( '@stdlib/assert/instance-of' );
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*
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* var out = readJSONSync( resolve( __dirname, '..', 'package.json' ) );
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* if ( instanceOf( out, Error ) ) {
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* throw out;
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* }
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* console.dir( out );
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*/
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function readJSONSync( file, options ) {
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var opts;
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var f;
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if ( arguments.length > 1 ) {
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if ( isString( options ) ) {
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opts = {
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'encoding': options
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};
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} else {
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if ( !isObject( options ) ) {
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throw new TypeError( 'invalid argument. Options argument must be either a string or an object. Value: `' + options + '`.' );
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}
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opts = options;
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}
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} else {
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opts = {};
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}
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f = readFile( file, opts );
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if ( instanceOf( f, Error ) ) {
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return f;
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}
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f = f.toString();
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if ( opts.encoding === 'utf8' ) {
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f = removeBOM( f );
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}
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if ( opts.reviver ) {
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return parseJSON( f, opts.reviver );
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}
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return parseJSON( f );
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}
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// EXPORTS //
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module.exports = readJSONSync;
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