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📄 langstring.php(7.47 KB)
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Editing: langstring.php

<?php
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.

/**
 * Language string based on David Mudrak langstring from local_amos.
 *
 * @package    tool_customlang
 * @copyright  2020 Ferran Recio <ferran@moodle.com>
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

namespace tool_customlang\local\mlang;

use moodle_exception;
use stdclass;

/**
 * Class containing a lang string cleaned.
 *
 * @package    tool_customlang
 * @copyright  2020 Ferran Recio <ferran@moodle.com>
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

/**
 * Represents a single string
 */
class langstring {

/** @var string identifier */
    public $id = null;

/** @var string */
    public $text = '';

/** @var int the time stamp when this string was saved */
    public $timemodified = null;

/** @var bool is deleted */
    public $deleted = false;

/** @var stdclass extra information about the string */
    public $extra = null;

/**
     * Class constructor.
     *
     * @param string $id string identifier
     * @param string $text string text
     * @param int $timemodified
     * @param int $deleted
     * @param stdclass $extra
     */
    public function __construct(string $id, string $text = '', int $timemodified = null,
            int $deleted = 0, stdclass $extra = null) {

if (is_null($timemodified)) {
            $timemodified = time();
        }
        $this->id           = $id;
        $this->text         = $text;
        $this->timemodified = $timemodified;
        $this->deleted      = $deleted;
        $this->extra        = $extra;
    }

/**
     * Given a string text, returns it being formatted properly for storing in AMOS repository.
     *
     * Note: This method is taken directly from local_amos as it is highly tested and robust.
     * The Moodle 1.x part is keep on puspose to make it easier the copy paste from both codes.
     * This could change in the future when AMOS stop suporting the 1.x langstrings.
     *
     * We need to know for what branch the string should be prepared due to internal changes in
     * format required by get_string()
     * - for get_string() in Moodle 1.6 - 1.9 use $format == 1
     * - for get_string() in Moodle 2.0 and higher use $format == 2
     *
     * Typical usages of this methods:
     *  $t = langstring::fix_syntax($t);          // sanity new translations of 2.x strings
     *  $t = langstring::fix_syntax($t, 1);       // sanity legacy 1.x strings
     *  $t = langstring::fix_syntax($t, 2, 1);    // convert format of 1.x strings into 2.x
     *
     * Backward converting 2.x format into 1.x is not supported
     *
     * @param string $text string text to be fixed
     * @param int $format target get_string() format version
     * @param int $from which format version does the text come from, defaults to the same as $format
     * @return string
     */
    public static function fix_syntax(string $text, int $format = 2, ?int $from = null): string {
        if (is_null($from)) {
            $from = $format;
        }

// Common filter.
        $clean = trim($text);
        $search = [
            // Remove \r if it is part of \r\n.
            '/\r(?=\n)/',

// Control characters to be replaced with \n
            // LINE TABULATION, FORM FEED, CARRIAGE RETURN, END OF TRANSMISSION BLOCK,
            // END OF MEDIUM, SUBSTITUTE, BREAK PERMITTED HERE, NEXT LINE, START OF STRING,
            // STRING TERMINATOR and Unicode character categorys Zl and Zp.
            '/[\x{0B}-\r\x{17}\x{19}\x{1A}\x{82}\x{85}\x{98}\x{9C}\p{Zl}\p{Zp}]/u',

// Control characters to be removed
            // NULL, ENQUIRY, ACKNOWLEDGE, BELL, SHIFT {OUT,IN}, DATA LINK ESCAPE,
            // DEVICE CONTROL {ONE,TWO,THREE,FOUR}, NEGATIVE ACKNOWLEDGE, SYNCHRONOUS IDLE, ESCAPE,
            // DELETE, PADDING CHARACTER, HIGH OCTET PRESET, NO BREAK HERE, INDEX,
            // {START,END} OF SELECTED AREA, CHARACTER TABULATION {SET,WITH JUSTIFICATION},
            // LINE TABULATION SET, PARTIAL LINE {FORWARD,BACKWARD}, REVERSE LINE FEED,
            // SINGLE SHIFT {TWO,THREE}, DEVICE CONTROL STRING, PRIVATE USE {ONE,TWO},
            // SET TRANSMIT STATE, MESSAGE WAITING, {START,END} OF GUARDED AREA,
            // {SINGLE {GRAPHIC,} CHARACTER,CONTROL SEQUENCE} INTRODUCER, OPERATING SYSTEM COMMAND,
            // PRIVACY MESSAGE, APPLICATION PROGRAM COMMAND, ZERO WIDTH {,NO-BREAK} SPACE,
            // REPLACEMENT CHARACTER.
            '/[\0\x{05}-\x{07}\x{0E}-\x{16}\x{1B}\x{7F}\x{80}\x{81}\x{83}\x{84}\x{86}-\x{93}\x{95}-\x{97}\x{99}-\x{9B}\x{9D}-\x{9F}\x{200B}\x{FEFF}\x{FFFD}]++/u',

// Remove trailing whitespace at the end of lines in a multiline string.
            '/[ \t]+(?=\n)/',
        ];
        $replace = [
            '',
            "\n",
            '',
            '',
        ];
        $clean = preg_replace($search, $replace, $clean);

if (($format === 2) && ($from === 2)) {
            // Sanity translations of 2.x strings.
            $clean = preg_replace("/\n{3,}/", "\n\n\n", $clean); // Collapse runs of blank lines.

} else if (($format === 2) && ($from === 1)) {
            // Convert 1.x string into 2.x format.
            $clean = preg_replace("/\n{3,}/", "\n\n\n", $clean); // Collapse runs of blank lines.
            $clean = preg_replace('/%+/', '%', $clean); // Collapse % characters.
            $clean = str_replace('\$', '@@@___XXX_ESCAPED_DOLLAR__@@@', $clean); // Remember for later.
            $clean = str_replace("\\", '', $clean); // Delete all slashes.
            $clean = preg_replace('/(^|[^{])\$a\b(\->[a-zA-Z0-9_]+)?/', '\\1{$a\\2}', $clean); // Wrap placeholders.
            $clean = str_replace('@@@___XXX_ESCAPED_DOLLAR__@@@', '$', $clean);
            $clean = str_replace('&#36;', '$', $clean);

} else if (($format === 1) && ($from === 1)) {
            // Sanity legacy 1.x strings.
            $clean = preg_replace("/\n{3,}/", "\n\n", $clean); // Collapse runs of blank lines.
            $clean = str_replace('\$', '@@@___XXX_ESCAPED_DOLLAR__@@@', $clean);
            $clean = str_replace("\\", '', $clean); // Delete all slashes.
            $clean = str_replace('$', '\$', $clean); // Escape all embedded variables.
            // Unescape placeholders: only $a and $a->something are allowed. All other $variables are left escaped.
            $clean = preg_replace('/\\\\\$a\b(\->[a-zA-Z0-9_]+)?/', '$a\\1', $clean); // Unescape placeholders.
            $clean = str_replace('@@@___XXX_ESCAPED_DOLLAR__@@@', '\$', $clean);
            $clean = str_replace('"', "\\\"", $clean); // Add slashes for ".
            $clean = preg_replace('/%+/', '%', $clean); // Collapse % characters.
            $clean = str_replace('%', '%%', $clean); // Duplicate %.

} else {
            throw new moodle_exception('Unknown get_string() format version');
        }
        return $clean;
    }
}

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