kworship/css/KwCssStyleSheet.cpp

   1 /***************************************************************************
   2  *   This file is part of KWorship.                                        *
   3  *   Copyright 2008 James Hogan <james@albanarts.com>                      *
   4  *                                                                         *
   5  *   KWorship is free software: you can redistribute it and/or modify      *
   6  *   it under the terms of the GNU General Public License as published by  *
   7  *   the Free Software Foundation, either version 2 of the License, or     *
   8  *   (at your option) any later version.                                   *
   9  *                                                                         *
  10  *   KWorship is distributed in the hope that it will be useful,           *
  11  *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
  12  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
  13  *   GNU General Public License for more details.                          *
  14  *                                                                         *
  15  *   You should have received a copy of the GNU General Public License     *
  16  *   along with KWorship.  If not, write to the Free Software Foundation,  *
  17  *   Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.   *
  18  ***************************************************************************/
  19
  20 /**
  21  * @file KwCssStyleSheet.cpp
  22  * @brief Cascading style sheet.
  23  * @author James Hogan <james@albanarts.com>
  24  */
  25
  26 #include "KwCssStyleSheet.h"
  27 #include "KwCssStyleRule.h"
  28
  29 #include <cassert>
  30
  31 /*
  32  * Constructors + destructors
  33  */
  34
  35 /// Default constructor.
  36 KwCssStyleSheet::KwCssStyleSheet()
  37 : m_rules()
  38 {
  39 }
  40
  41 /// Copy constructor.
  42 /**
  43  * This copies all except the actual styles in each rule which are aliased.
  44  */
  45 KwCssStyleSheet::KwCssStyleSheet(const KwCssStyleSheet& copy)
  46 : m_rules()
  47 {
  48   /// @todo Copy rules
  49   assert(0&&"unimplemented");
  50 }
  51
  52 /// Destructor.
  53 KwCssStyleSheet::~KwCssStyleSheet()
  54 {
  55 }
  56
  57 /*
  58  * Main interface
  59  */
  60
  61 /// Clear the rules.
  62 void KwCssStyleSheet::clear()
  63 {
  64   m_rules.clear();
  65 }
  66
  67 /// Append a rule.
  68 void KwCssStyleSheet::addRule(const KwCssStyleRule& rule)
  69 {
  70   m_rules.push_back(rule);
  71 }
  72
  73 /// Import another stylesheet.
  74 void KwCssStyleSheet::importStyleSheet(const KwCssStyleSheet* styleSheet)
  75 {
  76   m_rules += styleSheet->m_rules;
  77 }
  78
  79 /// Import from CSS-like format into the sheet.
  80 void KwCssStyleSheet::import(const KwCssSchema* schema, const QString& sheet)
  81 {
  82   QString css = sheet;
  83
  84   // Strip out comments and newlines
  85   static QRegExp reComment("\\/\\*([^*]|\\*[^/])*\\*\\/|\n");
  86   css.replace(reComment, " ");
  87
  88   // Go through rules
  89   static QRegExp reRuleStart("^\\s*(\\S[^{]*)?\\s*\\{\\s*");
  90   int rulesPos = 0;
  91   int lastRulesPos = 0;
  92   while (-1 != (rulesPos = reRuleStart.indexIn(css, lastRulesPos, QRegExp::CaretAtOffset)))
  93   {
  94     lastRulesPos = rulesPos + reRuleStart.matchedLength();
  95     KwCssStyleRule rule;
  96
  97     // Read the key criteria
  98     static QRegExp reCriteriaKey("^(\\w*)(#(\\w+))?\\s*");
  99     KwCssStyleRule::KeyList keys;
 100     QString head = reRuleStart.cap(1);
 101     int headPos = 0;
 102     int lastHeadPos = 0;
 103     while (-1 != (headPos = reCriteriaKey.indexIn(head, lastHeadPos, QRegExp::CaretAtOffset)) && reCriteriaKey.matchedLength() > 0)
 104     {
 105       lastHeadPos = headPos + reCriteriaKey.matchedLength();
 106       QString keyTypeName = reCriteriaKey.cap(1);
 107       QString keyName = reCriteriaKey.cap(2);
 108       int keyType = -1;
 109       if (!keyTypeName.isEmpty())
 110       {
 111         keyType = KwCssScopeKey::registerScopeType(keyTypeName);
 112       }
 113       keys += KwCssScopeKey(keyType, keyName);
 114     }
 115     rule.setCriteriaKeys(keys);
 116
 117     // Read the class criteria
 118     static QRegExp reCriteriaClass("^\\.(\\w+)\\s*");
 119     KwCssStyleRule::StringSet classes;
 120     while (-1 != (headPos = reCriteriaClass.indexIn(head, lastHeadPos, QRegExp::CaretAtOffset)))
 121     {
 122       lastHeadPos = headPos + reCriteriaClass.matchedLength();
 123       classes += reCriteriaClass.cap(1);
 124     }
 125     rule.setCriteriaClasses(classes);
 126
 127     // Read the class includes
 128     static QRegExp reIncludeStart("^:\\s*");
 129     if (-1 != (headPos = reIncludeStart.indexIn(head, lastHeadPos, QRegExp::CaretAtOffset)))
 130     {
 131       lastHeadPos = headPos + reIncludeStart.matchedLength();
 132       KwCssStyleRule::StringSet classes;
 133       while (-1 != (headPos = reCriteriaClass.indexIn(head, lastHeadPos, QRegExp::CaretAtOffset)))
 134       {
 135         lastHeadPos = headPos + reCriteriaClass.matchedLength();
 136         classes += reCriteriaClass.cap(1);
 137       }
 138       rule.setIncludedStyles(classes);
 139     }
 140
 141     // Should be no more head left
 142     static QRegExp reWhitespace("^\\s*$");
 143     if (-1 == reWhitespace.indexIn(head, lastHeadPos, QRegExp::CaretAtOffset))
 144     {
 145       Q_ASSERT(0&& "Expected '{' near something else");
 146     }
 147
 148     // Read the styles
 149     lastRulesPos = rule.getStyles()->import(schema, css, lastRulesPos);
 150
 151     // End of rule
 152     static QRegExp reRuleEnd("^\\}\\s*");
 153     if (-1 != (rulesPos = reRuleEnd.indexIn(css, lastRulesPos, QRegExp::CaretAtOffset)))
 154     {
 155       lastRulesPos = rulesPos + reRuleEnd.matchedLength();
 156     }
 157     else
 158     {
 159       // Expected end of rule but got something else
 160       Q_ASSERT(0&& "Expected '}' near something else");
 161     }
 162     m_rules += rule;
 163   }
 164 }
 165
 166 /*
 167  * Accessors
 168  */
 169
 170 /// Get the rules.
 171 KwCssStyleSheet::RuleList& KwCssStyleSheet::getRules()
 172 {
 173   return m_rules;
 174 }
 175
 176 /// Get the constant rules.
 177 const KwCssStyleSheet::RuleList& KwCssStyleSheet::getRules() const
 178 {
 179   return m_rules;
 180 }
 181
 182 /// Convert to CSS-like format.
 183 QString KwCssStyleSheet::toString() const
 184 {
 185   /// @todo Take into account of shared styles in rules!
 186   QString result = "/* Doesn't take shared styles into account */\n";
 187   foreach (const KwCssStyleRule& rule, m_rules)
 188   {
 189     result += rule.toString();
 190   }
 191   return result;
 192 }