gnu-social/lib/htmloutputter.php
2009-01-22 03:13:11 -08:00

366 lines
12 KiB
PHP

<?php
/**
* Laconica, the distributed open-source microblogging tool
*
* Low-level generator for HTML
*
* PHP version 5
*
* LICENCE: This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program 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 Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* @category Output
* @package Laconica
* @author Evan Prodromou <evan@controlyourself.ca>
* @author Sarven Capadisli <csarven@controlyourself.ca>
* @copyright 2008 Control Yourself, Inc.
* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
* @link http://laconi.ca/
*/
if (!defined('LACONICA')) {
exit(1);
}
require_once INSTALLDIR.'/lib/xmloutputter.php';
define('PAGE_TYPE_PREFS',
'text/html,application/xhtml+xml,'.
'application/xml;q=0.3,text/xml;q=0.2');
/**
* Low-level generator for HTML
*
* Abstracts some of the code necessary for HTML generation. Especially
* has methods for generating HTML form elements. Note that these have
* been created kind of haphazardly, not with an eye to making a general
* HTML-creation class.
*
* @category Output
* @package Laconica
* @author Evan Prodromou <evan@controlyourself.ca>
* @author Sarven Capadisli <csarven@controlyourself.ca>
* @license http://www.fsf.org/licensing/licenses/agpl-3.0.html GNU Affero General Public License version 3.0
* @link http://laconi.ca/
*
* @see Action
* @see XMLOutputter
*/
class HTMLOutputter extends XMLOutputter
{
/**
* Constructor
*
* Just wraps the XMLOutputter constructor.
*
* @param string $output URI to output to, default = stdout
* @param boolean $indent Whether to indent output, default true
*/
function __construct($output='php://output', $indent=true)
{
parent::__construct($output, $indent);
}
/**
* Start an HTML document
*
* If $type isn't specified, will attempt to do content negotiation.
*
* Attempts to do content negotiation for language, also.
*
* @param string $type MIME type to use; default is to do negotation.
*
* @todo extract content negotiation code to an HTTP module or class.
*
* @return void
*/
function startHTML($type=null)
{
if (!$type) {
$httpaccept = isset($_SERVER['HTTP_ACCEPT']) ?
$_SERVER['HTTP_ACCEPT'] : null;
// XXX: allow content negotiation for RDF, RSS, or XRDS
$cp = common_accept_to_prefs($httpaccept);
$sp = common_accept_to_prefs(PAGE_TYPE_PREFS);
$type = common_negotiate_type($cp, $sp);
if (!$type) {
common_user_error(_('This page is not available in a '.
'media type you accept'), 406);
exit(0);
}
}
header('Content-Type: '.$type);
$this->extraHeaders();
$this->startXML('html',
'-//W3C//DTD XHTML 1.0 Strict//EN',
'http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd');
// FIXME: correct language for interface
$language = common_language();
$this->elementStart('html', array('xmlns' => 'http://www.w3.org/1999/xhtml',
'xml:lang' => $language,
'lang' => $language));
}
/**
* Ends an HTML document
*
* @return void
*/
function endHTML()
{
$this->elementEnd('html');
$this->endXML();
}
/**
* To specify additional HTTP headers for the action
*
* @return void
*/
function extraHeaders()
{
// Needs to be overloaded
}
/**
* Output an HTML text input element
*
* Despite the name, it is specifically for outputting a
* text input element, not other <input> elements. It outputs
* a cluster of elements, including a <label> and an associated
* instructions span.
*
* @param string $id element ID, must be unique on page
* @param string $label text of label for the element
* @param string $value value of the element, default null
* @param string $instructions instructions for valid input
*
* @todo add a $name parameter
* @todo add a $maxLength parameter
* @todo add a $size parameter
*
* @return void
*/
function input($id, $label, $value=null, $instructions=null)
{
$this->element('label', array('for' => $id), $label);
$attrs = array('name' => $id,
'type' => 'text',
'id' => $id);
if ($value) {
$attrs['value'] = htmlspecialchars($value);
}
$this->element('input', $attrs);
if ($instructions) {
$this->element('p', 'form_guide', $instructions);
}
}
/**
* output an HTML checkbox and associated elements
*
* Note that the value is default 'true' (the string), which can
* be used by Action::boolean()
*
* @param string $id element ID, must be unique on page
* @param string $label text of label for the element
* @param string $checked if the box is checked, default false
* @param string $instructions instructions for valid input
* @param string $value value of the checkbox, default 'true'
* @param string $disabled show the checkbox disabled, default false
*
* @return void
*
* @todo add a $name parameter
*/
function checkbox($id, $label, $checked=false, $instructions=null,
$value='true', $disabled=false)
{
$attrs = array('name' => $id,
'type' => 'checkbox',
'class' => 'checkbox',
'id' => $id);
if ($value) {
$attrs['value'] = htmlspecialchars($value);
}
if ($checked) {
$attrs['checked'] = 'checked';
}
if ($disabled) {
$attrs['disabled'] = 'true';
}
$this->element('input', $attrs);
$this->text(' ');
$this->element('label', array('class' => 'checkbox',
'for' => $id),
$label);
$this->text(' ');
if ($instructions) {
$this->element('p', 'form_guide', $instructions);
}
}
/**
* output an HTML combobox/select and associated elements
*
* $content is an array of key-value pairs for the dropdown, where
* the key is the option value attribute and the value is the option
* text. (Careful on the overuse of 'value' here.)
*
* @param string $id element ID, must be unique on page
* @param string $label text of label for the element
* @param array $content options array, value => text
* @param string $instructions instructions for valid input
* @param string $blank_select whether to have a blank entry, default false
* @param string $selected selected value, default null
*
* @return void
*
* @todo add a $name parameter
*/
function dropdown($id, $label, $content, $instructions=null,
$blank_select=false, $selected=null)
{
$this->element('label', array('for' => $id), $label);
$this->elementStart('select', array('id' => $id, 'name' => $id));
if ($blank_select) {
$this->element('option', array('value' => ''));
}
foreach ($content as $value => $option) {
if ($value == $selected) {
$this->element('option', array('value' => $value,
'selected' => $value),
$option);
} else {
$this->element('option', array('value' => $value), $option);
}
}
$this->elementEnd('select');
if ($instructions) {
$this->element('p', 'form_guide', $instructions);
}
}
/**
* output an HTML hidden element
*
* $id is re-used as name
*
* @param string $id element ID, must be unique on page
* @param string $value hidden element value, default null
* @param string $name name, if different than ID
*
* @return void
*/
function hidden($id, $value, $name=null)
{
$this->element('input', array('name' => ($name) ? $name : $id,
'type' => 'hidden',
'id' => $id,
'value' => $value));
}
/**
* output an HTML password input and associated elements
*
* @param string $id element ID, must be unique on page
* @param string $label text of label for the element
* @param string $instructions instructions for valid input
*
* @return void
*
* @todo add a $name parameter
*/
function password($id, $label, $instructions=null)
{
$this->element('label', array('for' => $id), $label);
$attrs = array('name' => $id,
'type' => 'password',
'class' => 'password',
'id' => $id);
$this->element('input', $attrs);
if ($instructions) {
$this->element('p', 'form_guide', $instructions);
}
}
/**
* output an HTML submit input and associated elements
*
* @param string $id element ID, must be unique on page
* @param string $label text of the button
* @param string $cls class of the button, default 'submit'
* @param string $name name, if different than ID
*
* @return void
*
* @todo add a $name parameter
*/
function submit($id, $label, $cls='submit', $name=null, $title=null)
{
$this->element('input', array('type' => 'submit',
'id' => $id,
'name' => ($name) ? $name : $id,
'class' => $cls,
'value' => $label,
'title' => $title));
}
/**
* output an HTML textarea and associated elements
*
* @param string $id element ID, must be unique on page
* @param string $label text of label for the element
* @param string $content content of the textarea, default none
* @param string $instructions instructions for valid input
*
* @return void
*
* @todo add a $name parameter
* @todo add a $cols parameter
* @todo add a $rows parameter
*/
function textarea($id, $label, $content=null, $instructions=null)
{
$this->element('label', array('for' => $id), $label);
$this->element('textarea', array('rows' => 3,
'cols' => 40,
'name' => $id,
'id' => $id),
($content) ? $content : '');
if ($instructions) {
$this->element('p', 'form_guide', $instructions);
}
}
}