/platform/external/webkit/WebCore/css/CSSMediaRule.cpp

  1/**
  2 * (C) 1999-2003 Lars Knoll (knoll@kde.org)
  3 * (C) 2002-2003 Dirk Mueller (mueller@kde.org)
  4 * Copyright (C) 2002, 2005, 2006 Apple Computer, Inc.
  5 * Copyright (C) 2006 Samuel Weinig (sam@webkit.org)
  6 *
  7 * This library is free software; you can redistribute it and/or
  8 * modify it under the terms of the GNU Library General Public
  9 * License as published by the Free Software Foundation; either
 10 * version 2 of the License, or (at your option) any later version.
 11 *
 12 * This library is distributed in the hope that it will be useful,
 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 15 * Library General Public License for more details.
 16 *
 17 * You should have received a copy of the GNU Library General Public License
 18 * along with this library; see the file COPYING.LIB.  If not, write to
 19 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 20 * Boston, MA 02110-1301, USA.
 21 */
 22
 23#include "config.h"
 24#include "CSSMediaRule.h"
 25
 26#include "CSSParser.h"
 27#include "ExceptionCode.h"
 28
 29namespace WebCore {
 30
 31CSSMediaRule::CSSMediaRule(CSSStyleSheet* parent, PassRefPtr<MediaList> media, PassRefPtr<CSSRuleList> rules)
 32    : CSSRule(parent)
 33    , m_lstMedia(media)
 34    , m_lstCSSRules(rules)
 35{
 36}
 37
 38CSSMediaRule::~CSSMediaRule()
 39{
 40    if (m_lstMedia)
 41        m_lstMedia->setParent(0);
 42
 43    int length = m_lstCSSRules->length();
 44    for (int i = 0; i < length; i++)
 45        m_lstCSSRules->item(i)->setParent(0);
 46}
 47
 48unsigned CSSMediaRule::append(CSSRule* rule)
 49{
 50    if (!rule)
 51        return 0;
 52
 53    rule->setParent(this);
 54    return m_lstCSSRules->insertRule(rule, m_lstCSSRules->length());
 55}
 56
 57unsigned CSSMediaRule::insertRule(const String& rule, unsigned index, ExceptionCode& ec)
 58{
 59    if (index > m_lstCSSRules->length()) {
 60        // INDEX_SIZE_ERR: Raised if the specified index is not a valid insertion point.
 61        ec = INDEX_SIZE_ERR;
 62        return 0;
 63    }
 64
 65    CSSParser p(useStrictParsing());
 66    RefPtr<CSSRule> newRule = p.parseRule(parentStyleSheet(), rule);
 67    if (!newRule) {
 68        // SYNTAX_ERR: Raised if the specified rule has a syntax error and is unparsable.
 69        ec = SYNTAX_ERR;
 70        return 0;
 71    }
 72
 73    if (newRule->isImportRule()) {
 74        // FIXME: an HIERARCHY_REQUEST_ERR should also be thrown for a @charset or a nested
 75        // @media rule.  They are currently not getting parsed, resulting in a SYNTAX_ERR
 76        // to get raised above.
 77
 78        // HIERARCHY_REQUEST_ERR: Raised if the rule cannot be inserted at the specified
 79        // index, e.g., if an @import rule is inserted after a standard rule set or other
 80        // at-rule.
 81        ec = HIERARCHY_REQUEST_ERR;
 82        return 0;
 83    }
 84
 85    newRule->setParent(this);
 86    unsigned returnedIndex = m_lstCSSRules->insertRule(newRule.get(), index);
 87
 88    // stylesheet() can only return 0 for computed style declarations.
 89    stylesheet()->styleSheetChanged();
 90
 91    return returnedIndex;
 92}
 93
 94void CSSMediaRule::deleteRule(unsigned index, ExceptionCode& ec)
 95{
 96    if (index >= m_lstCSSRules->length()) {
 97        // INDEX_SIZE_ERR: Raised if the specified index does not correspond to a
 98        // rule in the media rule list.
 99        ec = INDEX_SIZE_ERR;
100        return;
101    }
102
103    m_lstCSSRules->deleteRule(index);
104
105    // stylesheet() can only return 0 for computed style declarations.
106    stylesheet()->styleSheetChanged();
107}
108
109String CSSMediaRule::cssText() const
110{
111    String result = "@media ";
112    if (m_lstMedia) {
113        result += m_lstMedia->mediaText();
114        result += " ";
115    }
116    result += "{ \n";
117
118    if (m_lstCSSRules) {
119        unsigned len = m_lstCSSRules->length();
120        for (unsigned i = 0; i < len; i++) {
121            result += "  ";
122            result += m_lstCSSRules->item(i)->cssText();
123            result += "\n";
124        }
125    }
126
127    result += "}";
128    return result;
129}
130
131} // namespace WebCore