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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:invalid_quote_end' );
// Possible transition states...
var ERROR = state2enum[ 'error' ];
var FIELD = state2enum[ 'field' ];
var INIT = state2enum[ 'init' ];
// FUNCTIONS //
/**
* Removes whitespace following a closing quote sequence.
*
* @private
* @param {Parser} parser - parser instance
* @param {NonNegativeInteger} state - next state
* @returns {void}
*/
function removeWhitespace( parser, state ) {
// Check whether the character sequence consists only of whitespace:
if ( parser._isWhitespace( parser._qidx+1, parser._cursor ) ) {
// Rewind the cursor and resume normal processing:
parser._raiseWarning( 'INVALID_CLOSING_QUOTE' )
._rewind( parser._cursor-parser._qidx )
._changeState( state );
return;
}
// Non-whitespace characters came after a closing quote, leaving us in an ambiguous state: was the closing quote intended and we're missing a delimiter/newline, or was the closing quote a mistake and should have been escaped? We don't know, and so we must raise an exception:
debug( 'Error.' );
parser._setErrorState( 'INVALID_CLOSING_QUOTE' )._changeState( ERROR );
}
// MAIN //
/**
* Returns a function for processing field characters after an ending quote sequence.
*
* @private
* @param {Parser} parser - parser instance
* @returns {Function} processing function
*/
function processor( parser ) {
var delimiterLastIndex;
var newlineLastIndex;
var delimiter;
var newline;
delimiterLastIndex = parser._delimiterLastIndex;
delimiter = parser._delimiter;
newlineLastIndex = parser._newlineLastIndex;
newline = parser._newline;
return next;
/**
* Processes a character.
*
* @private
* @param {string} ch - character
* @returns {void}
*/
function next( ch ) {
debug( 'Char: %s', ch );
/*
* Check for a field delimiter.
*/
if (
ch === delimiter[ delimiterLastIndex ] &&
parser._scan( delimiter, delimiterLastIndex )
) {
// Rewind the cursor to point to the last character before the delimiter character sequence:
debug( 'Delimiter.' );
parser._rewind( delimiterLastIndex );
// Remove whitespace and resume processing:
removeWhitespace( parser, FIELD );
return;
}
/*
* Check for a row separator.
*/
if (
ch === newline[ newlineLastIndex ] &&
parser._scan( newline, newlineLastIndex )
) {
// Rewind the cursor to point to the last character before the newline character sequence:
debug( 'Newline.' );
parser._rewind( newlineLastIndex );
// Remove whitespace and resume processing:
removeWhitespace( parser, INIT );
return;
}
// Continue processing until we can transition to a new state:
parser._push( ch );
}
}
// EXPORTS //
module.exports = processor;
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