<?php
-# Copyright (C) 2009 Aryeh Gregor
-# http://www.mediawiki.org/
-#
-# This program 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 2 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 General Public License for more details.
-#
-# You should have received a copy of the GNU General Public License along
-# with this program; if not, write to the Free Software Foundation, Inc.,
-# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
-# http://www.gnu.org/copyleft/gpl.html
+/**
+ * Collection of methods to generate HTML content
+ *
+ * Copyright © 2009 Aryeh Gregor
+ * http://www.mediawiki.org/
+ *
+ * This program 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 2 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ * http://www.gnu.org/copyleft/gpl.html
+ *
+ * @file
+ */
/**
* This class is a collection of static functions that serve two purposes:
*
- * 1) Implement any algorithms specified by HTML 5, or other HTML
+ * 1) Implement any algorithms specified by HTML5, or other HTML
* specifications, in a convenient and self-contained way.
*
* 2) Allow HTML elements to be conveniently and safely generated, like the
* This class is meant to be confined to utility functions that are called from
* trusted code paths. It does not do enforcement of policy like not allowing
* <a> elements.
+ *
+ * @since 1.16
*/
class Html {
- # List of void elements from HTML 5, section 9.1.2 as of 2009-08-10
+ # List of void elements from HTML5, section 9.1.2 as of 2009-08-10
private static $voidElements = array(
'area',
'base',
);
# Boolean attributes, which may have the value omitted entirely. Manually
- # collected from the HTML 5 spec as of 2009-08-10.
+ # collected from the HTML5 spec as of 2010-06-07.
private static $boolAttribs = array(
'async',
- 'autobuffer',
'autofocus',
'autoplay',
'checked',
'formnovalidate',
'hidden',
'ismap',
+ 'itemscope',
'loop',
'multiple',
'novalidate',
'open',
+ 'pubdate',
'readonly',
'required',
'reversed',
'scoped',
'seamless',
+ 'selected',
);
/**
*
* @param $element string The element's name, e.g., 'a'
* @param $attribs array Associative array of attributes, e.g., array(
- * 'href' => 'http://www.mediawiki.org/' ). Values will be HTML-escaped.
+ * 'href' => 'http://www.mediawiki.org/' ). See expandAttributes() for
+ * further documentation.
* @param $contents string The raw HTML contents of the element: *not*
* escaped!
* @return string Raw HTML
*/
public static function rawElement( $element, $attribs = array(), $contents = '' ) {
- global $wgHtml5, $wgWellFormedXml;
- # This is not required in HTML 5, but let's do it anyway, for
- # consistency and better compression.
- $element = strtolower( $element );
-
- # Element-specific hacks to slim down output and ensure validity
- if ( $element == 'input' ) {
- if ( !$wgHtml5 ) {
- # With $wgHtml5 off we want to validate as XHTML 1, so we
- # strip out any fancy HTML 5-only input types for now.
- #
- # Whitelist of valid types:
- $validTypes = array(
- 'hidden',
- 'text',
- 'password',
- 'checkbox',
- 'radio',
- 'file',
- 'submit',
- 'image',
- 'reset',
- 'button',
- );
- if ( isset( $attribs['type'] )
- && !in_array( $attribs['type'], $validTypes ) ) {
- # Fall back to type=text, the default
- unset( $attribs['type'] );
- }
- # Here we're blacklisting some HTML5-only attributes...
- $html5attribs = array(
- 'autocomplete',
- 'autofocus',
- 'max',
- 'min',
- 'multiple',
- 'pattern',
- 'placeholder',
- 'required',
- 'step',
- );
- foreach ( $html5attribs as $badAttr ) {
- unset( $attribs[$badAttr] );
- }
- }
- }
-
- $start = "<$element" . self::expandAttributes( $attribs );
+ global $wgWellFormedXml;
+ $start = self::openElement( $element, $attribs );
if ( in_array( $element, self::$voidElements ) ) {
if ( $wgWellFormedXml ) {
- return "$start />";
+ # Silly XML.
+ return substr( $start, 0, -1 ) . ' />';
}
- return "$start>";
+ return $start;
} else {
- return "$start>$contents</$element>";
+ return "$start$contents" . self::closeElement( $element );
}
}
) ) );
}
+ /**
+ * Identical to rawElement(), but has no third parameter and omits the end
+ * tag (and the self-closing '/' in XML mode for empty elements).
+ */
+ public static function openElement( $element, $attribs = array() ) {
+ global $wgHtml5, $wgWellFormedXml;
+ $attribs = (array)$attribs;
+ # This is not required in HTML5, but let's do it anyway, for
+ # consistency and better compression.
+ $element = strtolower( $element );
+
+ # In text/html, initial <html> and <head> tags can be omitted under
+ # pretty much any sane circumstances, if they have no attributes. See:
+ # <http://www.whatwg.org/specs/web-apps/current-work/multipage/syntax.html#optional-tags>
+ if ( !$wgWellFormedXml && !$attribs
+ && in_array( $element, array( 'html', 'head' ) ) ) {
+ return '';
+ }
+
+ # Remove HTML5-only attributes if we aren't doing HTML5, and disable
+ # form validation regardless (see bug 23769 and the more detailed
+ # comment in expandAttributes())
+ if ( $element == 'input' ) {
+ # Whitelist of types that don't cause validation. All except
+ # 'search' are valid in XHTML1.
+ $validTypes = array(
+ 'hidden',
+ 'text',
+ 'password',
+ 'checkbox',
+ 'radio',
+ 'file',
+ 'submit',
+ 'image',
+ 'reset',
+ 'button',
+ 'search',
+ );
+ if ( isset( $attribs['type'] )
+ && !in_array( $attribs['type'], $validTypes ) ) {
+ unset( $attribs['type'] );
+ }
+ if ( isset( $attribs['type'] ) && $attribs['type'] == 'search'
+ && !$wgHtml5 ) {
+ unset( $attribs['type'] );
+ }
+ }
+ if ( !$wgHtml5 && $element == 'textarea' && isset( $attribs['maxlength'] ) ) {
+ unset( $attribs['maxlength'] );
+ }
+
+ return "<$element" . self::expandAttributes(
+ self::dropDefaults( $element, $attribs ) ) . '>';
+ }
+
+ /**
+ * Returns "</$element>", except if $wgWellFormedXml is off, in which case
+ * it returns the empty string when that's guaranteed to be safe.
+ *
+ * @since 1.17
+ * @param $element string Name of the element, e.g., 'a'
+ * @return string A closing tag, if required
+ */
+ public static function closeElement( $element ) {
+ global $wgWellFormedXml;
+
+ $element = strtolower( $element );
+
+ # Reference:
+ # http://www.whatwg.org/specs/web-apps/current-work/multipage/syntax.html#optional-tags
+ if ( !$wgWellFormedXml && in_array( $element, array(
+ 'html',
+ 'head',
+ 'body',
+ 'li',
+ 'dt',
+ 'dd',
+ 'tr',
+ 'td',
+ 'th',
+ ) ) ) {
+ return '';
+ }
+ return "</$element>";
+ }
+
+ /**
+ * Given an element name and an associative array of element attributes,
+ * return an array that is functionally identical to the input array, but
+ * possibly smaller. In particular, attributes might be stripped if they
+ * are given their default values.
+ *
+ * This method is not guaranteed to remove all redundant attributes, only
+ * some common ones and some others selected arbitrarily at random. It
+ * only guarantees that the output array should be functionally identical
+ * to the input array (currently per the HTML 5 draft as of 2009-09-06).
+ *
+ * @param $element string Name of the element, e.g., 'a'
+ * @param $attribs array Associative array of attributes, e.g., array(
+ * 'href' => 'http://www.mediawiki.org/' ). See expandAttributes() for
+ * further documentation.
+ * @return array An array of attributes functionally identical to $attribs
+ */
+ private static function dropDefaults( $element, $attribs ) {
+ # Don't bother doing anything if we aren't outputting HTML5; it's too
+ # much of a pain to maintain two sets of defaults.
+ global $wgHtml5;
+ if ( !$wgHtml5 ) {
+ return $attribs;
+ }
+
+ static $attribDefaults = array(
+ 'area' => array( 'shape' => 'rect' ),
+ 'button' => array(
+ 'formaction' => 'GET',
+ 'formenctype' => 'application/x-www-form-urlencoded',
+ 'type' => 'submit',
+ ),
+ 'canvas' => array(
+ 'height' => '150',
+ 'width' => '300',
+ ),
+ 'command' => array( 'type' => 'command' ),
+ 'form' => array(
+ 'action' => 'GET',
+ 'autocomplete' => 'on',
+ 'enctype' => 'application/x-www-form-urlencoded',
+ ),
+ 'input' => array(
+ 'formaction' => 'GET',
+ 'type' => 'text',
+ 'value' => '',
+ ),
+ 'keygen' => array( 'keytype' => 'rsa' ),
+ 'link' => array( 'media' => 'all' ),
+ 'menu' => array( 'type' => 'list' ),
+ # Note: the use of text/javascript here instead of other JavaScript
+ # MIME types follows the HTML5 spec.
+ 'script' => array( 'type' => 'text/javascript' ),
+ 'style' => array(
+ 'media' => 'all',
+ 'type' => 'text/css',
+ ),
+ 'textarea' => array( 'wrap' => 'soft' ),
+ );
+
+ $element = strtolower( $element );
+
+ foreach ( $attribs as $attrib => $value ) {
+ $lcattrib = strtolower( $attrib );
+ $value = strval( $value );
+
+ # Simple checks using $attribDefaults
+ if ( isset( $attribDefaults[$element][$lcattrib] ) &&
+ $attribDefaults[$element][$lcattrib] == $value ) {
+ unset( $attribs[$attrib] );
+ }
+
+ if ( $lcattrib == 'class' && $value == '' ) {
+ unset( $attribs[$attrib] );
+ }
+ }
+
+ # More subtle checks
+ if ( $element === 'link' && isset( $attribs['type'] )
+ && strval( $attribs['type'] ) == 'text/css' ) {
+ unset( $attribs['type'] );
+ }
+ if ( $element === 'select' && isset( $attribs['size'] ) ) {
+ if ( in_array( 'multiple', $attribs )
+ || ( isset( $attribs['multiple'] ) && $attribs['multiple'] !== false )
+ ) {
+ # A multi-select
+ if ( strval( $attribs['size'] ) == '4' ) {
+ unset( $attribs['size'] );
+ }
+ } else {
+ # Single select
+ if ( strval( $attribs['size'] ) == '1' ) {
+ unset( $attribs['size'] );
+ }
+ }
+ }
+
+ return $attribs;
+ }
+
/**
* Given an associative array of element attributes, generate a string
* to stick after the element name in HTML output. Like array( 'href' =>
*
* @param $attribs array Associative array of attributes, e.g., array(
* 'href' => 'http://www.mediawiki.org/' ). Values will be HTML-escaped.
+ * A value of false means to omit the attribute. For boolean attributes,
+ * you can omit the key, e.g., array( 'checked' ) instead of
+ * array( 'checked' => 'checked' ) or such.
* @return string HTML fragment that goes between element name and '>'
* (starting with a space if at least one attribute is output)
*/
global $wgHtml5, $wgWellFormedXml;
$ret = '';
+ $attribs = (array)$attribs;
foreach ( $attribs as $key => $value ) {
+ if ( $value === false || is_null( $value ) ) {
+ continue;
+ }
+
# For boolean attributes, support array( 'foo' ) instead of
# requiring array( 'foo' => 'meaningless' ).
if ( is_int( $key )
$key = $value;
}
- # Not technically required in HTML 5, but required in XHTML 1.0,
+ # Not technically required in HTML5, but required in XHTML 1.0,
# and we'd like consistency and better compression anyway.
$key = strtolower( $key );
- # See the "Attributes" section in the HTML syntax part of HTML 5,
+ # Bug 23769: Blacklist all form validation attributes for now. Current
+ # (June 2010) WebKit has no UI, so the form just refuses to submit
+ # without telling the user why, which is much worse than failing
+ # server-side validation. Opera is the only other implementation at
+ # this time, and has ugly UI, so just kill the feature entirely until
+ # we have at least one good implementation.
+ if ( in_array( $key, array( 'max', 'min', 'pattern', 'required', 'step' ) ) ) {
+ continue;
+ }
+
+ # Here we're blacklisting some HTML5-only attributes...
+ if ( !$wgHtml5 && in_array( $key, array(
+ 'autocomplete',
+ 'autofocus',
+ 'max',
+ 'min',
+ 'multiple',
+ 'pattern',
+ 'placeholder',
+ 'required',
+ 'step',
+ 'spellcheck',
+ ) ) ) {
+ continue;
+ }
+
+ # See the "Attributes" section in the HTML syntax part of HTML5,
# 9.1.2.3 as of 2009-08-10. Most attributes can have quotation
# marks omitted, but not all. (Although a literal " is not
# permitted, we don't check for that, since it will be escaped
# anyway.)
- if ( $wgWellFormedXml || $value == ''
- || preg_match( "/[ '=<>]/", $value ) ) {
+ #
+ # See also research done on further characters that need to be
+ # escaped: http://code.google.com/p/html5lib/issues/detail?id=93
+ $badChars = "\\x00- '=<>`/\x{00a0}\x{1680}\x{180e}\x{180F}\x{2000}\x{2001}"
+ . "\x{2002}\x{2003}\x{2004}\x{2005}\x{2006}\x{2007}\x{2008}\x{2009}"
+ . "\x{200A}\x{2028}\x{2029}\x{202F}\x{205F}\x{3000}";
+ if ( $wgWellFormedXml || $value === ''
+ || preg_match( "![$badChars]!u", $value ) ) {
$quote = '"';
} else {
$quote = '';
if ( in_array( $key, self::$boolAttribs ) ) {
# In XHTML 1.0 Transitional, the value needs to be equal to the
- # key. In HTML 5, we can leave the value empty instead. If we
+ # key. In HTML5, we can leave the value empty instead. If we
# don't need well-formed XML, we can omit the = entirely.
if ( !$wgWellFormedXml ) {
$ret .= " $key";
# and we don't need <> escaped here, we may as well not call
# htmlspecialchars(). FIXME: verify that we actually need to
# escape \n\r\t here, and explain why, exactly.
- $ret .= " $key=$quote" . strtr( $value, array(
+ #
+ # We could call Sanitizer::encodeAttribute() for this, but we
+ # don't because we're stubborn and like our marginal savings on
+ # byte size from not having to encode unnecessary quotes.
+ $map = array(
'&' => '&',
'"' => '"',
"\n" => ' ',
"\r" => ' ',
"\t" => '	'
- ) ) . $quote;
+ );
+ if ( $wgWellFormedXml ) {
+ # This is allowed per spec: <http://www.w3.org/TR/xml/#NT-AttValue>
+ # But reportedly it breaks some XML tools? FIXME: is this
+ # really true?
+ $map['<'] = '<';
+ }
+ $ret .= " $key=$quote" . strtr( $value, $map ) . $quote;
}
}
return $ret;
* contains literal '</style>' (admittedly unlikely).
*
* @param $contents string CSS
- * @param $media mixed A media type string, like 'screen', or null for all
- * media
+ * @param $media mixed A media type string, like 'screen'
* @return string Raw HTML
*/
- public static function inlineStyle( $contents, $media = null ) {
- global $wgHtml5, $wgWellFormedXml;
+ public static function inlineStyle( $contents, $media = 'all' ) {
+ global $wgWellFormedXml;
- $attrs = array();
- if ( !$wgHtml5 ) {
- $attrs['type'] = 'text/css';
- }
if ( $wgWellFormedXml && preg_match( '/[<&]/', $contents ) ) {
$contents = "/*<![CDATA[*/$contents/*]]>*/";
}
- if ( $media !== null ) {
- $attrs['media'] = $media;
- }
- return self::rawElement( 'style', $attrs, $contents );
+ return self::rawElement( 'style', array(
+ 'type' => 'text/css',
+ 'media' => $media,
+ ), $contents );
}
/**
* media type (if any).
*
* @param $url string
- * @param $media mixed A media type string, like 'screen', or null for all
- * media
+ * @param $media mixed A media type string, like 'screen'
* @return string Raw HTML
*/
- public static function linkedStyle( $url, $media = null ) {
- global $wgHtml5;
-
- $attrs = array( 'rel' => 'stylesheet', 'href' => $url );
- if ( !$wgHtml5 ) {
- $attrs['type'] = 'text/css';
- }
- if ( $media !== null ) {
- $attrs['media'] = $media;
- }
- return self::element( 'link', $attrs );
+ public static function linkedStyle( $url, $media = 'all' ) {
+ return self::element( 'link', array(
+ 'rel' => 'stylesheet',
+ 'href' => $url,
+ 'type' => 'text/css',
+ 'media' => $media,
+ ) );
}
/**
* Convenience function to produce an <input> element. This supports the
- * new HTML 5 input types and attributes, and will silently strip them if
+ * new HTML5 input types and attributes, and will silently strip them if
* $wgHtml5 is false.
*
* @param $name string name attribute
- * @param $value mixed value attribute (null = omit)
+ * @param $value mixed value attribute
* @param $type string type attribute
* @param $attribs array Associative array of miscellaneous extra
* attributes, passed to Html::element()
* @return string Raw HTML
*/
- public static function input( $name, $value = null, $type = 'text', $attribs = array() ) {
- if ( $type != 'text' ) {
- $attribs['type'] = $type;
- }
- if ( $value !== null && $value !== '' ) {
- $attribs['value'] = $value;
- }
+ public static function input( $name, $value = '', $type = 'text', $attribs = array() ) {
+ $attribs['type'] = $type;
+ $attribs['value'] = $value;
$attribs['name'] = $name;
return self::element( 'input', $attribs );
}
/**
- * Convenience function to produce an input element with type=hidden, like
- * Xml::hidden.
+ * Convenience function to produce an input element with type=hidden
*
* @param $name string name attribute
* @param $value string value attribute
public static function hidden( $name, $value, $attribs = array() ) {
return self::input( $name, $value, 'hidden', $attribs );
}
+
+ /**
+ * Convenience function to produce an <input> element. This supports leaving
+ * out the cols= and rows= which Xml requires and are required by HTML4/XHTML
+ * but not required by HTML5 and will silently set cols="" and rows="" if
+ * $wgHtml5 is false and cols and rows are omitted (HTML4 validates present
+ * but empty cols="" and rows="" as valid).
+ *
+ * @param $name string name attribute
+ * @param $value string value attribute
+ * @param $attribs array Associative array of miscellaneous extra
+ * attributes, passed to Html::element()
+ * @return string Raw HTML
+ */
+ public static function textarea( $name, $value = '', $attribs = array() ) {
+ global $wgHtml5;
+ $attribs['name'] = $name;
+ if ( !$wgHtml5 ) {
+ if ( !isset( $attribs['cols'] ) ) {
+ $attribs['cols'] = "";
+ }
+ if ( !isset( $attribs['rows'] ) ) {
+ $attribs['rows'] = "";
+ }
+ }
+ return self::element( 'textarea', $attribs, $value );
+ }
+
+ /**
+ * Constructs the opening html-tag with necessary doctypes depending on
+ * global variables.
+ *
+ * @param $attribs array Associative array of miscellaneous extra
+ * attributes, passed to Html::element() of html tag.
+ * @return string Raw HTML
+ */
+ public static function htmlHeader( $attribs = array() ) {
+ $ret = '';
+
+ global $wgMimeType, $wgOutputEncoding;
+ if ( self::isXmlMimeType( $wgMimeType ) ) {
+ $ret .= "<?xml version=\"1.0\" encoding=\"$wgOutputEncoding\" ?" . ">\n";
+ }
+
+ global $wgHtml5, $wgHtml5Version, $wgDocType, $wgDTD;
+ global $wgXhtmlNamespaces, $wgXhtmlDefaultNamespace;
+ if ( $wgHtml5 ) {
+ $ret .= "<!DOCTYPE html>\n";
+ if ( $wgHtml5Version ) {
+ $attribs['version'] = $wgHtml5Version;
+ }
+ } else {
+ $ret .= "<!DOCTYPE html PUBLIC \"$wgDocType\" \"$wgDTD\">\n";
+ $attribs['xmlns'] = $wgXhtmlDefaultNamespace;
+ foreach ( $wgXhtmlNamespaces as $tag => $ns ) {
+ $attribs["xmlns:$tag"] = $ns;
+ }
+ }
+ $html = Html::openElement( 'html', $attribs );
+ if ( $html ) {
+ $html .= "\n";
+ }
+ $ret .= $html;
+ return $ret;
+ }
+
+ /**
+ * Determines if the given mime type is xml.
+ *
+ * @param $mimetype string MimeType
+ * @return Boolean
+ */
+ public static function isXmlMimeType( $mimetype ) {
+ switch ( $mimetype ) {
+ case 'text/xml':
+ case 'application/xhtml+xml':
+ case 'application/xml':
+ return true;
+ default:
+ return false;
+ }
+ }
}