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<?php |
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|
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// +----------------------------------------------------------------------+ |
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// | Copyright 2013 Madpixels (email : visualizer@madpixels.net) | |
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// +----------------------------------------------------------------------+ |
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// | This program is free software; you can redistribute it and/or modify | |
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// | it under the terms of the GNU General Public License, version 2, as | |
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// | published by the Free Software Foundation. | |
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// | | |
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// | This program is distributed in the hope that it will be useful, | |
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// | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
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// | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
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// | GNU General Public License for more details. | |
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// | | |
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// | You should have received a copy of the GNU General Public License | |
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// | along with this program; if not, write to the Free Software | |
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// | Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, | |
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// | MA 02110-1301 USA | |
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// +----------------------------------------------------------------------+ |
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// | Author: Eugene Manuilov <eugene@manuilov.org> | |
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// +----------------------------------------------------------------------+ |
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/** |
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* Source manager for local CSV files. |
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* |
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* @category Visualizer |
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* @package Source |
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* |
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* @since 1.0.0 |
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*/ |
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class Visualizer_Source_Csv extends Visualizer_Source { |
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|
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/** |
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* The path to the file with data. |
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* |
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* @since 1.0.0 |
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* |
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* @access protected |
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* @var string |
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*/ |
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protected $_filename; |
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|
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/** |
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* Constructor. |
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* |
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* @since 1.0.0 |
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* |
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* @access public |
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* @param string $filename The path to the file. |
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*/ |
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public function __construct( $filename = '' ) { |
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$this->_filename = trim( (string) $filename ); |
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} |
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|
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/** |
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* Fetches series information. |
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* |
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* @since 1.0.0 |
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* |
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* @access private |
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* @param resource $handle The file handle resource. |
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*/ |
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private function _fetchSeries( &$handle ) { |
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// read column titles |
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$labels = fgetcsv( $handle, 0, VISUALIZER_CSV_DELIMITER, VISUALIZER_CSV_ENCLOSURE ); |
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$types = null; |
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|
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if ( false !== strpos( $this->_filename, 'tqx=out:csv' ) ) { |
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$attributes = $this->_fetchSeriesForGoogleQueryLanguage( $labels ); |
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if ( ! $attributes['abort'] ) { |
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$labels = $attributes['labels']; |
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$types = $attributes['types']; |
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} |
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} |
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|
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if ( is_null( $types ) ) { |
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// read series types |
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$types = fgetcsv( $handle, 0, VISUALIZER_CSV_DELIMITER, VISUALIZER_CSV_ENCLOSURE ); |
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} |
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|
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if ( ! is_array( $labels ) || ! is_array( $types ) ) { |
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$this->_error = esc_html__( 'File should have a heading row (1st row) and a data type row (2nd row). Please try again.', 'visualizer' ); |
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return false; |
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} |
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|
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$labels = array_filter( $labels ); |
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$types = array_filter( $types ); |
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|
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if ( ! $labels || ! $types ) { |
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$this->_error = esc_html__( 'File should have a heading row (1st row) and a data type row (2nd row). Please try again.', 'visualizer' ); |
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return false; |
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} |
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|
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$types = array_map( 'trim', $types ); |
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if ( ! self::_validateTypes( $types ) ) { |
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$this->_error = esc_html__( 'Invalid data types detected in the data type row (2nd row). Please try again.', 'visualizer' ); |
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return false; |
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} |
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|
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for ( $i = 0, $len = count( $labels ); $i < $len; $i++ ) { |
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$default_type = $i === 0 ? 'string' : 'number'; |
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|
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$labels[ $i ] = $this->toUTF8( $labels[ $i ] ); |
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|
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$this->_series[] = array( |
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'label' => sanitize_text_field( wp_strip_all_tags( $labels[ $i ] ) ), |
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'type' => isset( $types[ $i ] ) ? $types[ $i ] : $default_type, |
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); |
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} |
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|
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return true; |
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} |
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|
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/** |
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* Returns file handle to fetch data from. |
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* |
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* @since 1.4.2 |
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* |
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* @access protected |
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* @param string $filename Optional file name to get handle. If omitted, $_filename is used. |
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* @return resource File handle resource on success, otherwise FALSE. |
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*/ |
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protected function _get_file_handle( $filename = false ) { |
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// open file and return handle |
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return fopen( $filename ? $filename : $this->_filename, 'rb' ); |
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} |
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|
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/** |
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* Fetches information from source, parses it and builds series and data arrays. |
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* |
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* @since 1.0.0 |
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* |
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* @access public |
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* @return boolean TRUE on success, otherwise FALSE. |
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*/ |
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public function fetch() { |
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// if filename is empty return false |
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if ( empty( $this->_filename ) ) { |
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$this->_error = esc_html__( 'No file provided. Please try again.', 'visualizer' ); |
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return false; |
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} |
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|
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// read file and fill arrays |
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$handle = $this->_get_file_handle(); |
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if ( $handle ) { |
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// fetch series |
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if ( ! $this->_fetchSeries( $handle ) ) { |
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return false; |
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} |
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|
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// fetch data |
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$data = fgetcsv( $handle, 0, VISUALIZER_CSV_DELIMITER, VISUALIZER_CSV_ENCLOSURE ); |
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while ( $data !== false ) { |
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$this->_data[] = $this->_normalizeData( $data ); |
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$data = fgetcsv( $handle, 0, VISUALIZER_CSV_DELIMITER, VISUALIZER_CSV_ENCLOSURE ); |
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} |
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|
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// close file handle |
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fclose( $handle ); |
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} |
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|
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return true; |
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} |
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|
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/** |
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* Returns source name. |
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* |
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* @since 1.0.0 |
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* |
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* @access public |
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* @return string The name of source. |
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*/ |
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public function getSourceName() { |
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return __CLASS__; |
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} |
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|
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/** |
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* Adds support for QueryLanguage https://developers.google.com/chart/interactive/docs/querylanguage |
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* where the user can provide something like /gviz/tq?tq=select%20A%2C%20B%20&tqx=out:csv after the URL of the raw spreadsheet |
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* to get the subset of data specified by the query |
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* this will conflate the heading and the type into one value viz. for heading XXX and type string, the value will become "XXX string" |
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* so we need to split them apart logically |
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* also the $types variable now contains the first row because the header and the type got conflated |
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*/ |
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private function _fetchSeriesForGoogleQueryLanguage( $labels, $types = array() ) { |
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$new_labels = array(); |
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$new_types = array(); |
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$abort = false; |
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foreach ( $labels as $label ) { |
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// get the index of the last space |
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$index = strrpos( $label, ' ' ); |
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if ( $index === false ) { |
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// no space here? something has gone wrong; abort the entire process. |
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$abort = true; |
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break; |
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} |
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$type = trim( substr( $label, $index + 1 ) ); |
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if ( ! self::_validateTypes( array( $type ) ) ) { |
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// some other data type? abort the entire process. |
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$abort = true; |
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break; |
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} |
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$label = substr( $label, 0, $index ); |
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$new_labels[] = $label; |
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$new_types[] = $type; |
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} |
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if ( ! $abort ) { |
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$labels = $new_labels; |
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$types = $new_types; |
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} |
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|
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return array( |
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'abort' => $abort, |
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'labels' => $labels, |
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'types' => $types, |
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); |
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} |
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} |
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|
