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<?php
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// This file is part of Moodle - http://moodle.org/
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//
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// Moodle is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// Moodle 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 Moodle. If not, see <http://www.gnu.org/licenses/>.
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/**
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* JSON data format writer
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*
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* @package dataformat_json
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* @copyright 2016 Brendan Heywood (brendan@catalyst-au.net)
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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*/
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namespace dataformat_json;
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use core_text;
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/**
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* JSON data format writer
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*
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* @package dataformat_json
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* @copyright 2016 Brendan Heywood (brendan@catalyst-au.net)
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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*/
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class writer extends \core\dataformat\base {
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/** @var $mimetype */
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public $mimetype = "application/json";
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/** @var $extension */
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public $extension = ".json";
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/** @var $sheetstarted */
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public $sheetstarted = false;
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/** @var $sheetdatadded */
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public $sheetdatadded = false;
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/** @var string[] $columns */
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protected $columns = [];
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/**
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* Write the start of the file.
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*/
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public function start_output() {
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echo "[";
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}
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/**
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* Write the start of the sheet we will be adding data to.
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*
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* @param array $columns
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*/
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public function start_sheet($columns) {
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$this->columns = array_map(function($column) {
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return core_text::strtolower(clean_param($column, PARAM_ALPHANUMEXT));
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}, $columns);
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if ($this->sheetstarted) {
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echo ",";
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} else {
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$this->sheetstarted = true;
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}
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$this->sheetdatadded = false;
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echo "[";
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}
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/**
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* Write a single record
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*
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* @param array $record
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* @param int $rownum
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*/
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public function write_record($record, $rownum) {
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if ($this->sheetdatadded) {
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echo ",";
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}
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// Ensure our record is keyed by column names, rather than numerically.
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$record = array_combine($this->columns, (array) $record);
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echo json_encode($this->format_record($record), JSON_UNESCAPED_UNICODE | JSON_PRETTY_PRINT);
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$this->sheetdatadded = true;
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}
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/**
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* Write the end of the sheet containing the data.
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*
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* @param array $columns
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*/
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public function close_sheet($columns) {
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echo "]";
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}
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/**
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* Write the end of the file.
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*/
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public function close_output() {
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echo "]";
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}
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}
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