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      1 /**
      2  * (C) 1999-2003 Lars Knoll (knoll (at) kde.org)
      3  * (C) 2002-2003 Dirk Mueller (mueller (at) kde.org)
      4  * Copyright (C) 2002, 2005, 2006 Apple Computer, Inc.
      5  * Copyright (C) 2006 Samuel Weinig (sam (at) 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 
     29 namespace WebCore {
     30 
     31 CSSMediaRule::CSSMediaRule(CSSStyleSheet* parent, PassRefPtr<MediaList> media, PassRefPtr<CSSRuleList> rules)
     32     : CSSRule(parent)
     33     , m_lstMedia(media)
     34     , m_lstCSSRules(rules)
     35 {
     36 }
     37 
     38 CSSMediaRule::~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 
     48 unsigned 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 
     57 unsigned 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 
     94 void 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 
    109 String 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
    132