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* @license Apache-2.0
*
* Copyright (c) 2024 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 isFunction = require( '@stdlib/assert/is-function' );
var parseJSON = require( '@stdlib/utils/parse-json' );
var format = require( '@stdlib/string/format' );
var isWhitespace = require( '@stdlib/assert/is-whitespace' );
var reEOL = require( '@stdlib/regexp/eol' );
// MAIN //
/**
* Parses a string as newline-delimited JSON (NDJSON).
*
* @param {string} str - input string
* @param {Function} [reviver] - transformation function applied to each line
* @throws {TypeError} first argument must be a string
* @throws {TypeError} reviver must be a function
* @returns {(Array|Error)} array of parsed values or an error
*
* @example
* var out = parseNDJSON( '{"name":"John"}\n{"name":"Doe"}' );
* // returns [ { 'name': 'John' }, { 'name': 'Doe' } ]
*/
function parseNDJSON( str, reviver ) {
var parsed;
var RE_EOL;
var lines;
var out;
var i;
if ( !isString( str ) ) {
throw new TypeError( format( 'invalid argument. First argument must be a string. Value: `%s`.', str ) );
}
if ( arguments.length > 1 && !isFunction( reviver ) ) {
throw new TypeError( format( 'invalid argument. Reviver argument must be a function. Value: `%s`.', str ) );
}
if ( isWhitespace( str ) || str === '' ) {
return [];
}
RE_EOL = reEOL();
lines = str.split( RE_EOL );
// Remove trailing newline:
if ( lines[ lines.length - 1 ].length === 0 ) {
lines.pop();
}
out = [];
for ( i = 0; i < lines.length; i++ ) {
if ( reviver ) {
parsed = parseJSON( lines[ i ], reviver );
} else {
parsed = parseJSON( lines[ i ] );
}
if ( parsed instanceof Error ) {
return parsed;
}
out.push( parsed );
}
return out;
}
// EXPORTS //
module.exports = parseNDJSON;
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