layout/base/nsQuoteList.h

   1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* This Source Code Form is subject to the terms of the Mozilla Public
   3  * License, v. 2.0. If a copy of the MPL was not distributed with this
   4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   5
   6 /* implementation of quotes for the CSS 'content' property */
   7
   8 #ifndef nsQuoteList_h___
   9 #define nsQuoteList_h___
  10
  11 #include "mozilla/Attributes.h"
  12 #include "nsGenConList.h"
  13
  14 struct nsQuoteNode : public nsGenConNode {
  15   // open-quote, close-quote, no-open-quote, or no-close-quote
  16   const nsStyleContentType mType;
  17
  18   // Quote depth before this quote, which is always non-negative.
  19   int32_t mDepthBefore;
  20
  21   nsQuoteNode(nsStyleContentType& aType, uint32_t aContentIndex)
  22     : nsGenConNode(aContentIndex)
  23     , mType(aType)
  24     , mDepthBefore(0)
  25   {
  26     NS_ASSERTION(aType == eStyleContentType_OpenQuote ||
  27                  aType == eStyleContentType_CloseQuote ||
  28                  aType == eStyleContentType_NoOpenQuote ||
  29                  aType == eStyleContentType_NoCloseQuote,
  30                  "incorrect type");
  31     NS_ASSERTION(aContentIndex <= INT32_MAX, "out of range");
  32   }
  33
  34   virtual bool InitTextFrame(nsGenConList* aList,
  35           nsIFrame* aPseudoFrame, nsIFrame* aTextFrame) MOZ_OVERRIDE;
  36
  37   // is this 'open-quote' or 'no-open-quote'?
  38   bool IsOpenQuote() {
  39     return mType == eStyleContentType_OpenQuote ||
  40            mType == eStyleContentType_NoOpenQuote;
  41   }
  42
  43   // is this 'close-quote' or 'no-close-quote'?
  44   bool IsCloseQuote() {
  45     return !IsOpenQuote();
  46   }
  47
  48   // is this 'open-quote' or 'close-quote'?
  49   bool IsRealQuote() {
  50     return mType == eStyleContentType_OpenQuote ||
  51            mType == eStyleContentType_CloseQuote;
  52   }
  53
  54   // Depth of the quote for *this* node.  Either non-negative or -1.
  55   // -1 means this is a closing quote that tried to decrement the
  56   // counter below zero (which means no quote should be rendered).
  57   int32_t Depth() {
  58     return IsOpenQuote() ? mDepthBefore : mDepthBefore - 1;
  59   }
  60
  61   // always non-negative
  62   int32_t DepthAfter() {
  63     return IsOpenQuote() ? mDepthBefore + 1
  64                          : (mDepthBefore == 0 ? 0 : mDepthBefore - 1);
  65   }
  66
  67   // The text that should be displayed for this quote.
  68   const nsString* Text();
  69 };
  70
  71 class nsQuoteList : public nsGenConList {
  72 private:
  73   nsQuoteNode* FirstNode() { return static_cast<nsQuoteNode*>(mFirstNode); }
  74 public:
  75   // assign the correct |mDepthBefore| value to a node that has been inserted
  76   // Should be called immediately after calling |Insert|.
  77   void Calc(nsQuoteNode* aNode);
  78
  79   nsQuoteNode* Next(nsQuoteNode* aNode) {
  80     return static_cast<nsQuoteNode*>(nsGenConList::Next(aNode));
  81   }
  82   nsQuoteNode* Prev(nsQuoteNode* aNode) {
  83     return static_cast<nsQuoteNode*>(nsGenConList::Prev(aNode));
  84   }
  85
  86   void RecalcAll();
  87 #ifdef DEBUG
  88   void PrintChain();
  89 #endif
  90 };
  91
  92 #endif /* nsQuoteList_h___ */