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