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* @license Apache-2.0
*
* Copyright (c) 2022 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.
*/
/* eslint-disable no-underscore-dangle */
'use strict';
// MODULES //
var logger = require( 'debug' );
var state2enum = require( './state2enum.js' );
// VARIABLES //
var debug = logger( 'state:quoted_field' );
// Possible transition states...
var QUOTE_END = state2enum[ 'quote_end' ];
var QUOTED_ESCAPE = state2enum[ 'quoted_escape' ];
// MAIN //
/**
* Returns a function for processing a quoted field.
*
* @private
* @param {Parser} parser - parser instance
* @returns {Function} processing function
*/
function processor( parser ) {
var escapeLastIndex;
var quoteLastIndex;
var doublequote;
var escape;
var quote;
escapeLastIndex = parser._escapeLastIndex;
escape = parser._escape;
quoteLastIndex = parser._quoteLastIndex;
quote = parser._quote;
doublequote = parser._doublequote;
return next;
/**
* Processes a character.
*
* @private
* @param {string} ch - character
* @returns {void}
*/
function next( ch ) {
debug( 'Char: %s', ch );
/*
* Check for an escape character sequence.
*/
if (
doublequote === false && // double quoting is disabled
ch === escape[ escapeLastIndex ] && // we have a potential match
parser._scan( escape, escapeLastIndex ) // we found a match
) {
debug( 'Escape.' );
parser._push( ch )._changeState( QUOTED_ESCAPE );
return;
}
/*
* Check for an ending quote character sequence.
*/
if (
ch === quote[ quoteLastIndex ] && // we have a potential match
parser._scan( quote, quoteLastIndex ) // we found a match
) {
// Rewind the cursor to point to the last character before the quote character sequence:
debug( 'Quote.' );
parser._rewind( quoteLastIndex )._changeState( QUOTE_END );
return;
}
// Continue processing until we can transition to a new state:
parser._push( ch );
}
}
// EXPORTS //
module.exports = processor;
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