From bcc75099ab496fc276557c426459d04063cffdcc Mon Sep 17 00:00:00 2001
From: Marc Alexander <admin@m-a-styles.de>
Date: Wed, 7 Apr 2021 22:20:23 +0200
Subject: [PATCH] [ticket/16752] Add first version of exporter to restructured
 text (rst)

PHPBB3-16752
---
 phpBB/phpbb/event/rst_exporter.php | 183 +++++++++++++++++++++++++++++
 1 file changed, 183 insertions(+)
 create mode 100644 phpBB/phpbb/event/rst_exporter.php

diff --git a/phpBB/phpbb/event/rst_exporter.php b/phpBB/phpbb/event/rst_exporter.php
new file mode 100644
index 0000000000..1b8376c814
--- /dev/null
+++ b/phpBB/phpbb/event/rst_exporter.php
@@ -0,0 +1,183 @@
+<?php
+/**
+ *
+ * This file is part of the phpBB Forum Software package.
+ *
+ * @copyright (c) phpBB Limited <https://www.phpbb.com>
+ * @license GNU General Public License, version 2 (GPL-2.0)
+ *
+ * For full copyright and license information, please see
+ * the docs/CREDITS.txt file.
+ *
+ */
+
+namespace phpbb\event;
+
+class rst_exporter
+{
+	/** @var array Column keys */
+	private $columns = [];
+
+	/** @var array Column headers map */
+	private $column_headers = [];
+
+	/** @var array Maximum lengths of columns */
+	private $max_lengths = [];
+
+	/** @var string rst data */
+	private $rst_data = '';
+
+	/**
+	 * Set columns with array where key is column name and value is title of column in table
+	 *
+	 * @param array $column_data
+	 */
+	public function set_columns(array $column_data): void
+	{
+		foreach ($column_data as $column_key => $column_header)
+		{
+			$this->columns[] = $column_key;
+			$this->column_headers[$column_key] = $column_header;
+		}
+	}
+
+	/**
+	 * Add header to rst page
+	 *
+	 * @param string $type Type of header; allowed are h2, h3, h4 corresponding to HTML
+	 * @param string $header_text Text of header
+	 */
+	public function add_section_header(string $type, string $header_text): void
+	{
+		$this->rst_data .= $header_text . "\n";
+
+		switch ($type)
+		{
+			case 'h2':
+				$header_character = '=';
+			break;
+
+			default:
+			case 'h3':
+				$header_character = '-';
+			break;
+
+			case 'h4':
+				$header_character = '~';
+			break;
+		}
+
+		$this->rst_data .= str_repeat($header_character, strlen($header_text)) . "\n\n";
+	}
+
+	/**
+	 * Fill table with event data
+	 *
+	 * @param array $event_data
+	 */
+	public function generate_events_table(array $event_data): void
+	{
+		$this->rst_data .= ".. table::\n";
+		$this->rst_data .= "    :class: events-list\n\n";
+
+		$this->set_max_lengths($event_data);
+
+		// Create table header
+		$this->rst_data .= $this->get_separator_line();
+		$this->rst_data .= "    |";
+		foreach ($this->columns as $column)
+		{
+			$this->rst_data .= $this->get_column($column, $this->column_headers[$column]);
+		}
+
+		$this->rst_data .= "\n" . $this->get_separator_line('=');
+
+		foreach ($event_data as $event)
+		{
+			$event_data = [];
+			$max_column_rows = 1;
+			foreach ($event as $key => $value)
+			{
+				$column_rows = !is_array($value) ? substr_count($value, '<br>') + 1 : 1;
+				$max_column_rows = max($max_column_rows, $column_rows);
+				$event_data[$key] = $column_rows > 1 ? explode('<br>', $value) : [is_array($value) ? implode(', ', $value) : $value];
+			}
+
+			for ($i = 0; $i < $max_column_rows; $i++)
+			{
+				$this->rst_data .= '    |';
+
+				foreach ($this->columns as $column)
+				{
+					$this->rst_data .= $this->get_column($column, $event_data[$column][$i] ?? '');
+				}
+				$this->rst_data .= "\n";
+			}
+			$this->rst_data .= $this->get_separator_line();
+		}
+	}
+
+	/**
+	 * Get rst output
+	 *
+	 * @return string
+	 */
+	public function get_rst_output(): string
+	{
+		return $this->rst_data;
+	}
+
+	/**
+	 * Set maximum lengths array
+	 *
+	 * @param array $event_data
+	 */
+	private function set_max_lengths(array $event_data): void
+	{
+		$this->max_lengths = [];
+
+		foreach ($this->columns as $column)
+		{
+			$this->max_lengths[$column] = strlen($this->column_headers[$column]);
+		}
+
+		foreach ($event_data as $event)
+		{
+			foreach ($this->columns as $column)
+			{
+				$event_column = is_array($event[$column]) ? implode(', ', $event[$column]) : $event[$column];
+				$this->max_lengths[$column] = max($this->max_lengths[$column], strlen($event_column));
+			}
+		}
+	}
+
+	/**
+	 * Get separator line
+	 *
+	 * @param string $separator_character
+	 * @return string
+	 */
+	private function get_separator_line(string $separator_character = '-'): string
+	{
+		$line = "    +";
+
+		foreach ($this->columns as $column)
+		{
+			$line .= str_repeat($separator_character, $this->max_lengths[$column] + 2) . '+';
+		}
+
+		return $line . "\n";
+	}
+
+	/**
+	 * Get table data column
+	 *
+	 * @param string $type Column type
+	 * @param string $content Column content
+	 * @return string
+	 */
+	private function get_column(string $type, string $content): string
+	{
+		return ' ' . $content . str_repeat(' ' , $this->max_lengths[$type] - strlen($content) + 1) . '|';
+	}
+}