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/*
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* (C) 1999-2003 Lars Knoll (knoll@kde.org)
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* Copyright (C) 2004, 2006 Apple Computer, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public License
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* along with this library; see the file COPYING.LIB. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#include "config.h"
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#include "MediaList.h"
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#include "CSSImportRule.h"
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#include "CSSParser.h"
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#include "CSSStyleSheet.h"
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#include "ExceptionCode.h"
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#include "MediaQuery.h"
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namespace WebCore {
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/* MediaList is used to store 3 types of media related entities which mean the same:
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* Media Queries, Media Types and Media Descriptors.
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* Currently MediaList always tries to parse media queries and if parsing fails,
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* tries to fallback to Media Descriptors if m_fallback flag is set.
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* Slight problem with syntax error handling:
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* CSS 2.1 Spec (http://www.w3.org/TR/CSS21/media.html)
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* specifies that failing media type parsing is a syntax error
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* CSS 3 Media Queries Spec (http://www.w3.org/TR/css3-mediaqueries/)
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* specifies that failing media query is a syntax error
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* HTML 4.01 spec (http://www.w3.org/TR/REC-html40/present/styles.html#adef-media)
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* specifies that Media Descriptors should be parsed with forward-compatible syntax
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* DOM Level 2 Style Sheet spec (http://www.w3.org/TR/DOM-Level-2-Style/)
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* talks about MediaList.mediaText and refers
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* - to Media Descriptors of HTML 4.0 in context of StyleSheet
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* - to Media Types of CSS 2.0 in context of CSSMediaRule and CSSImportRule
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*
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* These facts create situation where same (illegal) media specification may result in
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* different parses depending on whether it is media attr of style element or part of
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* css @media rule.
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* <style media="screen and resolution > 40dpi"> ..</style> will be enabled on screen devices where as
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* @media screen and resolution > 40dpi {..} will not.
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* This gets more counter-intuitive in JavaScript:
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* document.styleSheets[0].media.mediaText = "screen and resolution > 40dpi" will be ok and
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* enabled, while
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* document.styleSheets[0].cssRules[0].media.mediaText = "screen and resolution > 40dpi" will
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* throw SYNTAX_ERR exception.
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*/
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MediaList::MediaList(CSSStyleSheet* parentSheet, bool fallbackToDescriptor)
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: StyleBase(parentSheet)
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, m_fallback(fallbackToDescriptor)
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{
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}
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MediaList::MediaList(CSSStyleSheet* parentSheet, const String& media, bool fallbackToDescriptor)
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: StyleBase(parentSheet)
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, m_fallback(fallbackToDescriptor)
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{
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ExceptionCode ec = 0;
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setMediaText(media, ec);
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// FIXME: parsing can fail. The problem with failing constructor is that
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// we would need additional flag saying MediaList is not valid
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// Parse can fail only when fallbackToDescriptor == false, i.e when HTML4 media descriptor
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// forward-compatible syntax is not in use.
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// DOMImplementationCSS seems to mandate that media descriptors are used
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// for both html and svg, even though svg:style doesn't use media descriptors
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// Currently the only places where parsing can fail are
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// creating <svg:style>, creating css media / import rules from js
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if (ec)
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setMediaText("invalid", ec);
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}
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MediaList::MediaList(CSSImportRule* parentRule, const String& media)
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: StyleBase(parentRule)
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, m_fallback(false)
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{
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ExceptionCode ec = 0;
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setMediaText(media, ec);
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if (ec)
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setMediaText("invalid", ec);
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}
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MediaList::~MediaList()
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{
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deleteAllValues(m_queries);
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}
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static String parseMediaDescriptor(const String& s)
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{
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int len = s.length();
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// http://www.w3.org/TR/REC-html40/types.html#type-media-descriptors
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// "Each entry is truncated just before the first character that isn't a
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// US ASCII letter [a-zA-Z] (ISO 10646 hex 41-5a, 61-7a), digit [0-9] (hex 30-39),
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// or hyphen (hex 2d)."
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int i;
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unsigned short c;
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for (i = 0; i < len; ++i) {
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c = s[i];
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if (! ((c >= 'a' && c <= 'z')
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|| (c >= 'A' && c <= 'Z')
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|| (c >= '1' && c <= '9')
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|| (c == '-')))
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break;
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}
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return s.left(i);
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}
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void MediaList::deleteMedium(const String& oldMedium, ExceptionCode& ec)
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{
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RefPtr<MediaList> tempMediaList = MediaList::create();
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CSSParser p(true);
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MediaQuery* oldQuery = 0;
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bool deleteOldQuery = false;
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if (p.parseMediaQuery(tempMediaList.get(), oldMedium)) {
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if (tempMediaList->m_queries.size() > 0)
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oldQuery = tempMediaList->m_queries[0];
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} else if (m_fallback) {
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String medium = parseMediaDescriptor(oldMedium);
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if (!medium.isNull()) {
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oldQuery = new MediaQuery(MediaQuery::None, medium, 0);
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deleteOldQuery = true;
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}
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}
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// DOM Style Sheets spec doesn't allow SYNTAX_ERR to be thrown in deleteMedium
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ec = NOT_FOUND_ERR;
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if (oldQuery) {
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for (size_t i = 0; i < m_queries.size(); ++i) {
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MediaQuery* a = m_queries[i];
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if (*a == *oldQuery) {
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m_queries.remove(i);
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delete a;
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ec = 0;
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break;
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}
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}
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if (deleteOldQuery)
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delete oldQuery;
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}
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if (!ec)
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notifyChanged();
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}
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String MediaList::mediaText() const
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{
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String text("");
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bool first = true;
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for (size_t i = 0; i < m_queries.size(); ++i) {
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if (!first)
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text += ", ";
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else
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first = false;
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text += m_queries[i]->cssText();
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}
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return text;
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}
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void MediaList::setMediaText(const String& value, ExceptionCode& ec)
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{
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RefPtr<MediaList> tempMediaList = MediaList::create();
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CSSParser p(true);
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Vector<String> list;
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value.split(',', list);
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Vector<String>::const_iterator end = list.end();
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for (Vector<String>::const_iterator it = list.begin(); it != end; ++it) {
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String medium = (*it).stripWhiteSpace();
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if (!medium.isEmpty()) {
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if (!p.parseMediaQuery(tempMediaList.get(), medium)) {
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if (m_fallback) {
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String mediaDescriptor = parseMediaDescriptor(medium);
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if (!mediaDescriptor.isNull())
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tempMediaList->m_queries.append(new MediaQuery(MediaQuery::None, mediaDescriptor, 0));
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} else {
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ec = SYNTAX_ERR;
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return;
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}
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}
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} else if (!m_fallback) {
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ec = SYNTAX_ERR;
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return;
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}
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}
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// ",,,," falls straight through, but is not valid unless fallback
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if (!m_fallback && list.begin() == list.end()) {
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String s = value.stripWhiteSpace();
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if (!s.isEmpty()) {
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ec = SYNTAX_ERR;
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return;
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}
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}
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ec = 0;
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deleteAllValues(m_queries);
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m_queries = tempMediaList->m_queries;
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tempMediaList->m_queries.clear();
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notifyChanged();
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}
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String MediaList::item(unsigned index) const
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{
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if (index < m_queries.size()) {
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MediaQuery* query = m_queries[index];
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return query->cssText();
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}
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return String();
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}
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void MediaList::appendMedium(const String& newMedium, ExceptionCode& ec)
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{
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ec = INVALID_CHARACTER_ERR;
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CSSParser p(true);
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if (p.parseMediaQuery(this, newMedium)) {
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ec = 0;
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} else if (m_fallback) {
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String medium = parseMediaDescriptor(newMedium);
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if (!medium.isNull()) {
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m_queries.append(new MediaQuery(MediaQuery::None, medium, 0));
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ec = 0;
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}
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}
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if (!ec)
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notifyChanged();
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}
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void MediaList::appendMediaQuery(MediaQuery* mediaQuery)
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{
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m_queries.append(mediaQuery);
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}
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void MediaList::notifyChanged()
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{
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for (StyleBase* p = parent(); p; p = p->parent()) {
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if (p->isCSSStyleSheet())
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return static_cast<CSSStyleSheet*>(p)->styleSheetChanged();
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}
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}
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}
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