AlkantarClanX12
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<?php
/**
* CSV Parsing class for TablePress, used for import of CSV files
*
* @package TablePress
* @subpackage Import
* @author Tobias Bäthge
* @since 1.0.0
*/
// Prohibit direct script loading.
defined( 'ABSPATH' ) || die( 'No direct script access allowed!' );
/**
* CSV Parsing class
*
* @package TablePress
* @subpackage Import
* @author Tobias Bäthge
* @since 1.0.0
*/
class CSV_Parser {
/**
* The used character for the enclosure of a cell. Defaults to quotation mark ".
*
* @since 1.0.0
*/
protected string $enclosure = '"';
/**
* Number of rows to analyze when attempting to auto-detect the CSV delimiter.
*
* @since 1.0.0
*/
protected int $delimiter_search_max_lines = 15;
/**
* Characters to ignore when attempting to auto-detect delimiter.
*
* @since 1.0.0
*/
protected string $non_delimiter_chars = "a-zA-Z0-9\n\r";
/**
* The preferred delimiter characters, only used when all filtering method return multiple possible delimiters (happens very rarely).
* There must not be more than 9 characters in the preferred delimiter character list, see `_check_delimiter_count()`.
*
* @since 1.0.0
*/
protected string $preferred_delimiter_chars = ";,\t";
/**
* The CSV data string that shall be parsed to an array.
*
* @since 1.0.0
*/
protected string $import_data = '';
/**
* The error state while parsing input data.
*
* 0 = No errors found. Everything should be fine.
* 1 = A hopefully correctable syntax error was found.
* 2 = The enclosure character was found in a non-enclosed field. This means the file is either corrupt,
* or does not follow the common CSV standard. Please validate the parsed data manually.
*
* @since 1.0.0
*/
public int $error = 0;
/**
* Detailed error information.
*
* @since 1.0.0
* @var array<string, array<string, int|string>>
*/
public array $error_info = array();
/**
* Class Constructor.
*
* @since 1.0.0
*/
public function __construct() {
// Unused.
}
/**
* Load CSV data that shall be parsed.
*
* @since 1.0.0
*
* @param string $data Data to be parsed.
*/
public function load_data( string $data ): void {
// Check for mandatory trailing line break.
if ( ! str_ends_with( $data, "\n" ) ) {
$data .= "\n";
}
$this->import_data = $data;
}
/**
* Detect the CSV delimiter, by analyzing some rows to determine the most probable delimiter character.
*
* @since 1.0.0
*
* @return string Most probable delimiter character.
*/
public function find_delimiter(): string {
$data = &$this->import_data;
$delimiter_count = array();
$enclosed = false;
$current_line = 0;
// Walk through each character in the CSV string (up to $this->delimiter_search_max_lines) and search potential delimiter characters.
$data_length = strlen( $data );
for ( $i = 0; $i < $data_length; $i++ ) {
$prev_char = ( $i - 1 >= 0 ) ? $data[ $i - 1 ] : '';
$curr_char = $data[ $i ];
$next_char = ( $i + 1 < $data_length ) ? $data[ $i + 1 ] : '';
if ( $curr_char === $this->enclosure ) {
// Open and closing quotes.
if ( ! $enclosed || $next_char !== $this->enclosure ) {
$enclosed = ! $enclosed; // Flip bool.
} elseif ( $enclosed ) {
++$i; // Skip next character.
}
} elseif ( ( ( "\n" === $curr_char && "\r" !== $prev_char ) || "\r" === $curr_char ) && ! $enclosed ) {
// Reached end of a line.
++$current_line;
if ( $current_line >= $this->delimiter_search_max_lines ) {
break;
}
} elseif ( ! $enclosed ) {
// At this point, $curr_char seems to be used as a delimiter, as it is not enclosed.
// Count $curr_char if it is not in the $this->non_delimiter_chars list.
if ( 0 === preg_match( '#[' . $this->non_delimiter_chars . ']#i', $curr_char ) ) {
if ( ! isset( $delimiter_count[ $curr_char ][ $current_line ] ) ) {
$delimiter_count[ $curr_char ][ $current_line ] = 0; // Initialize empty.
}
++$delimiter_count[ $curr_char ][ $current_line ];
}
}
}
// Find most probable delimiter, by sorting their counts.
$potential_delimiters = array();
foreach ( $delimiter_count as $char => $line_counts ) {
$is_possible_delimiter = $this->_check_delimiter_count( $char, $line_counts, $current_line );
if ( false !== $is_possible_delimiter ) {
$potential_delimiters[ $is_possible_delimiter ] = $char;
}
}
ksort( $potential_delimiters );
// If no valid delimiter was found, use the character that was found in most rows.
if ( empty( $potential_delimiters ) ) {
$delimiter_counts = array_map( 'count', $delimiter_count );
arsort( $delimiter_counts, SORT_NUMERIC );
$potential_delimiters = array_keys( $delimiter_counts );
}
// If still no delimiter was found, fall back to a comma.
if ( empty( $potential_delimiters ) ) {
$potential_delimiters = array( ',' );
}
// Return first array element, as that has the highest count.
return array_shift( $potential_delimiters );
}
/**
* Check if passed character can be a delimiter, by checking counts in each line.
*
* @since 1.0.0
*
* @param string $char Character to check.
* @param int[] $line_counts Counts for the characters in the lines.
* @param int $number_lines Number of lines.
* @return bool|string False if delimiter is not possible, string to be used as a sort key if character could be a delimiter.
*/
protected function _check_delimiter_count( string $char, array $line_counts, int $number_lines ) /* : bool|string */ {
// Was the potential delimiter found in every line?
if ( count( $line_counts ) !== $number_lines ) {
return false;
}
// Check if the count in every line is the same (or one higher for an "almost").
$first = null;
$equal = null;
$almost = false;
foreach ( $line_counts as $count ) {
if ( is_null( $first ) ) {
$first = $count;
} elseif ( $count === $first && false !== $equal ) {
$equal = true;
} elseif ( $count === $first + 1 && false !== $equal ) {
$equal = true;
$almost = true;
} else {
$equal = false;
}
}
// Check equality only if there's more than one line.
if ( $number_lines > 1 && ! $equal ) {
return false;
}
// At this point, count is equal in all lines, so determine a string to sort priority.
$match = ( $almost ) ? 2 : 1;
// There must not be more than 9 characters in the preferred delimiter character list.
$pref = strpos( $this->preferred_delimiter_chars, $char );
if ( false === $pref ) {
$pref = 9;
}
return $pref . $match . '.' . ( 99999 - $first );
}
/**
* Parse CSV string into a two-dimensional array.
*
* @since 1.0.0
*
* @param string $delimiter Delimiter character for the CSV parsing.
* @return array<int, array<int, string>> Two-dimensional array with the data from the CSV string.
*/
public function parse( string $delimiter ): array {
$data = &$this->import_data;
// Filter delimiter from the list, if it is a whitespace character.
$white_spaces = str_replace( $delimiter, '', " \t\x0B\0" );
$rows = array(); // Complete rows.
$row = array(); // Row that is currently built.
$column = 0; // Current column index.
$cell_content = ''; // Content of the currently processed cell.
$enclosed = false;
$was_enclosed = false; // To determine if the cell content will be trimmed of whitespace (only for enclosed cells).
// Walk through each character in the CSV string.
$data_length = strlen( $data );
for ( $i = 0; $i < $data_length; $i++ ) {
$curr_char = $data[ $i ];
$next_char = ( $i + 1 < $data_length ) ? $data[ $i + 1 ] : '';
if ( $curr_char === $this->enclosure ) {
// Open/close quotes, and inline quotes.
if ( ! $enclosed ) {
if ( '' === ltrim( $cell_content, $white_spaces ) ) {
$enclosed = true;
$was_enclosed = true;
} else {
$this->error = 2;
$error_line = count( $rows ) + 1;
$error_column = $column + 1;
if ( ! isset( $this->error_info[ "{$error_line}-{$error_column}" ] ) ) {
$this->error_info[ "{$error_line}-{$error_column}" ] = array(
'type' => 2,
'info' => "Syntax error found in line {$error_line}. Non-enclosed fields can not contain double-quotes.",
'line' => $error_line,
'column' => $error_column,
);
}
$cell_content .= $curr_char;
}
} elseif ( $next_char === $this->enclosure ) {
// Enclosure character within enclosed cell (" encoded as "").
$cell_content .= $curr_char;
++$i; // Skip next character.
} elseif ( $next_char !== $delimiter && "\r" !== $next_char && "\n" !== $next_char ) {
// for-loop (instead of while-loop) that skips whitespace.
for ( $x = ( $i + 1 ); isset( $data[ $x ] ) && '' === ltrim( $data[ $x ], $white_spaces ); $x++ ) { // phpcs:ignore Generic.CodeAnalysis.ForLoopWithTestFunctionCall.NotAllowed,Generic.CodeAnalysis.EmptyStatement.DetectedFor
// Action is in iterator check.
}
if ( $data[ $x ] === $delimiter ) {
$enclosed = false;
$i = $x;
} else {
if ( $this->error < 1 ) {
$this->error = 1;
}
$error_line = count( $rows ) + 1;
$error_column = $column + 1;
if ( ! isset( $this->error_info[ "{$error_line}-{$error_column}" ] ) ) {
$this->error_info[ "{$error_line}-{$error_column}" ] = array(
'type' => 1,
'info' => "Syntax error found in line {$error_line}. A single double-quote was found within an enclosed string. Enclosed double-quotes must be escaped with a second double-quote.",
'line' => $error_line,
'column' => $error_column,
);
}
$cell_content .= $curr_char;
$enclosed = false;
}
} else {
// The " was the closing one for the cell.
$enclosed = false;
}
} elseif ( ( $curr_char === $delimiter || "\n" === $curr_char || "\r" === $curr_char ) && ! $enclosed ) {
// End of cell (by $delimiter), or end of line (by line break, and not enclosed!).
$row[ $column ] = ( $was_enclosed ) ? $cell_content : trim( $cell_content );
$cell_content = '';
$was_enclosed = false;
++$column;
// End of line.
if ( "\n" === $curr_char || "\r" === $curr_char ) {
// Append completed row.
$rows[] = $row;
$row = array();
$column = 0;
if ( "\r" === $curr_char && "\n" === $next_char ) {
// Skip next character in \r\n line breaks.
++$i;
}
}
} else {
// Append character to current cell.
$cell_content .= $curr_char;
}
}
return $rows;
}
} // class CSV_Parser