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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, max-len */
'use strict';
// MODULES //
var logger = require( 'debug' );
var state2enum = require( './state2enum.js' );
// VARIABLES //
var debug = logger( 'state:skip' );
// Possible transition states...
var INIT = state2enum[ 'init' ];
var SKIP = state2enum[ 'skip' ];
var SKIPPED_COMMENT = state2enum[ 'skipped_comment' ];
var SKIPPED_FIELD = state2enum[ 'skipped_field' ];
var SKIPPED_ESCAPE = state2enum[ 'skipped_escape' ];
var SKIPPED_QUOTED_FIELD = state2enum[ 'skipped_quoted_field' ];
// MAIN //
/**
* Returns a function for processing a skipped line.
*
* @private
* @param {Parser} parser - parser instance
* @returns {Function} processing function
*/
function processor( parser ) {
var delimiterLastIndex;
var newlineLastIndex;
var commentLastIndex;
var escapeLastIndex;
var quoteLastIndex;
var skipLastIndex;
var delimiter;
var newline;
var comment;
var quoting;
var escape;
var strict;
var quote;
var skip;
commentLastIndex = parser._commentLastIndex;
comment = parser._comment;
skipLastIndex = parser._skipLastIndex;
skip = parser._skip;
escapeLastIndex = parser._escapeLastIndex;
escape = parser._escape;
quoteLastIndex = parser._quoteLastIndex;
quote = parser._quote;
delimiterLastIndex = parser._delimiterLastIndex;
delimiter = parser._delimiter;
newlineLastIndex = parser._newlineLastIndex;
newline = parser._newline;
quoting = parser._quoting;
strict = parser._strict;
return next;
/**
* Processes a character.
*
* @private
* @param {string} ch - character
* @returns {void}
*/
function next( ch ) {
var idx = parser._cursor + 1;
debug( 'Char: %s', ch );
/*
* Check for the start of a commented line.
*
* ## Notes
*
* - In order for a row to be considered a commented line, the comment sequence must be the first character(s) of the field.
*/
if (
comment && // user specified a comment character sequence, so should check for comments
idx-commentLastIndex === 0 && // only search the first character(s) of the first field
ch === comment[ commentLastIndex ] && // we have a potential comment match
parser._scan( comment, commentLastIndex ) // we found a match
) {
debug( 'Comment.' );
parser._push( ch )._changeState( SKIPPED_COMMENT );
return;
}
/*
* Check for the start of a skipped line.
*
* ## Notes
*
* - In order for a row to be considered a skipped line, the skip sequence must be the first character(s) of the field.
*/
if (
skip && // user specified a skip character sequence, so should check for skipped lines
idx-skipLastIndex === 0 && // only search the first character(s) of the first field
ch === skip[ skipLastIndex ] && // we have a potential match
parser._scan( skip, skipLastIndex ) // we found a match
) {
debug( 'Skip.' );
parser._push( ch )._changeState( SKIP );
return;
}
/*
* Check for an escape character sequence.
*
* ## Notes
*
* - An escape sequence escapes the delimiter, newline, and escape sequences in **non-quoted** fields.
* - An escape sequence escapes comment and skip sequences in **non-quoted** fields when an escape sequence occurs at the beginning of a record.
* - When `doublequote` is `false`, the escape sequence escapes quote sequences within **quoted** fields.
* - If not immediately followed by a special character sequence, then the escape sequence has no special meaning.
*/
if (
ch === escape[ escapeLastIndex ] && // we have a potential match
parser._scan( escape, escapeLastIndex ) // we found a match
) {
debug( 'Escape.' );
parser._push( ch )._changeState( SKIPPED_ESCAPE );
return;
}
/*
* Check for a quote character sequence.
*
* ## Notes
*
* - When `quoting` is `true`, in order for a field to be quoted, the quote sequence must be the first character(s) of the field.
* - When `quoting` is `false`, quote sequences do **not** have any special meaning, and we process quote sequences as normal field text.
*/
if (
idx-quoteLastIndex === 0 && // only search the first character(s) of the field
ch === quote[ quoteLastIndex ] && // we have a potential match
parser._scan( quote, quoteLastIndex ) // we found a match
) {
if ( quoting ) {
debug( 'Quote.' );
parser._push( ch )._changeState( SKIPPED_QUOTED_FIELD );
return;
}
// Continue processing until we can transition to a new state:
parser._push( ch );
return;
}
/**
* Check for a quote character sequence (non-strict mode).
*
* ## Notes
*
* - In non-strict mode, a quote character sequence is allowed to start after whitespace (e.g., `a, "b", c`).
* - When `quoting` is `true`, in order for a field to be quoted, the quote sequence must be the first character(s) of the field.
* - When `quoting` is `false`, quote sequences do **not** have any special meaning, and we process quote sequences as normal field text.
*/
if (
strict === false && // non-strict mode
ch === quote[ quoteLastIndex ] && // we have a potential match
parser._scan( quote, quoteLastIndex ) // we found a match
) {
if ( quoting && parser._isWhitespace( 0, parser._cursor-quoteLastIndex ) ) {
debug( 'Quote.' );
parser._push( ch )._changeState( SKIPPED_QUOTED_FIELD );
return;
}
// Continue processing until we can transition to a new state:
parser._push( ch );
return;
}
/*
* Check for a field delimiter.
*/
if (
ch === delimiter[ delimiterLastIndex ] &&
parser._scan( delimiter, delimiterLastIndex )
) {
debug( 'Delimiter.' );
parser._push( ch )._changeState( SKIPPED_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 )._changeState( INIT );
return;
}
// Continue processing until we can transition to a new state:
parser._push( ch );
}
}
// EXPORTS //
module.exports = processor;
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