зеркало из https://github.com/mozilla/gecko-dev.git
556 строки
21 KiB
C++
556 строки
21 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef WSRunObject_h
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#define WSRunObject_h
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#include "nsCOMPtr.h"
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#include "nsIEditor.h" // for EDirection
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#include "nsINode.h"
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#include "nscore.h"
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#include "mozilla/Attributes.h"
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#include "mozilla/dom/Text.h"
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#include "mozilla/EditorDOMPoint.h" // for EditorDOMPoint
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class nsIDOMNode;
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namespace mozilla {
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class HTMLEditor;
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class HTMLEditRules;
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// class WSRunObject represents the entire whitespace situation
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// around a given point. It collects up a list of nodes that contain
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// whitespace and categorizes in up to 3 different WSFragments (detailed
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// below). Each WSFragment is a collection of whitespace that is
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// either all insignificant, or that is significant. A WSFragment could
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// consist of insignificant whitespace because it is after a block
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// boundary or after a break. Or it could be insignificant because it
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// is before a block. Or it could be significant because it is
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// surrounded by text, or starts and ends with nbsps, etc.
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// Throughout I refer to LeadingWS, NormalWS, TrailingWS. LeadingWS & TrailingWS
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// are runs of ascii ws that are insignificant (do not render) because they
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// are adjacent to block boundaries, or after a break. NormalWS is ws that
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// does cause soem rendering. Note that not all the ws in a NormalWS run need
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// render. For example, two ascii spaces surrounded by text on both sides
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// will only render as one space (in non-preformatted stlye html), yet both
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// spaces count as NormalWS. Together, they render as the one visible space.
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/**
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* A type-safe bitfield indicating various types of whitespace or other things.
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* Used as a member variable in WSRunObject and WSFragment.
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*
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* XXX: If this idea is useful in other places, we should generalize it using a
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* template.
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*/
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class WSType
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{
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public:
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enum Enum
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{
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none = 0,
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leadingWS = 1, // leading insignificant ws, ie, after block or br
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trailingWS = 1 << 1, // trailing insignificant ws, ie, before block
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normalWS = 1 << 2, // normal significant ws, ie, after text, image, ...
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text = 1 << 3, // indicates regular (non-ws) text
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special = 1 << 4, // indicates an inline non-container, like image
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br = 1 << 5, // indicates a br node
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otherBlock = 1 << 6, // indicates a block other than one ws run is in
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thisBlock = 1 << 7, // indicates the block ws run is in
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block = otherBlock | thisBlock // block found
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};
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/**
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* Implicit constructor, because the enums are logically just WSTypes
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* themselves, and are only a separate type because there's no other obvious
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* way to name specific WSType values.
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*/
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MOZ_IMPLICIT WSType(const Enum& aEnum = none)
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: mEnum(aEnum)
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{}
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// operator==, &, and | need to access mEnum
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friend bool operator==(const WSType& aLeft, const WSType& aRight);
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friend const WSType operator&(const WSType& aLeft, const WSType& aRight);
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friend const WSType operator|(const WSType& aLeft, const WSType& aRight);
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WSType& operator=(const WSType& aOther)
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{
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// This handles self-assignment fine
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mEnum = aOther.mEnum;
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return *this;
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}
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WSType& operator&=(const WSType& aOther)
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{
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mEnum &= aOther.mEnum;
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return *this;
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}
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WSType& operator|=(const WSType& aOther)
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{
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mEnum |= aOther.mEnum;
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return *this;
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}
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private:
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uint16_t mEnum;
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void bool_conversion_helper() {}
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public:
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// Allow boolean conversion with no numeric conversion
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typedef void (WSType::*bool_type)();
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operator bool_type() const
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{
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return mEnum ? &WSType::bool_conversion_helper : nullptr;
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}
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};
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/**
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* These are declared as global functions so "WSType::Enum == WSType" et al.
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* will work using the implicit constructor.
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*/
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inline bool operator==(const WSType& aLeft, const WSType& aRight)
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{
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return aLeft.mEnum == aRight.mEnum;
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}
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inline bool operator!=(const WSType& aLeft, const WSType& aRight)
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{
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return !(aLeft == aRight);
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}
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inline const WSType operator&(const WSType& aLeft, const WSType& aRight)
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{
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WSType ret;
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ret.mEnum = aLeft.mEnum & aRight.mEnum;
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return ret;
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}
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inline const WSType operator|(const WSType& aLeft, const WSType& aRight)
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{
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WSType ret;
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ret.mEnum = aLeft.mEnum | aRight.mEnum;
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return ret;
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}
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/**
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* Make sure that & and | of WSType::Enum creates a WSType instead of an int,
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* because operators between WSType and int shouldn't work
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*/
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inline const WSType operator&(const WSType::Enum& aLeft,
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const WSType::Enum& aRight)
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{
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return WSType(aLeft) & WSType(aRight);
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}
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inline const WSType operator|(const WSType::Enum& aLeft,
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const WSType::Enum& aRight)
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{
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return WSType(aLeft) | WSType(aRight);
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}
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class MOZ_STACK_CLASS WSRunObject final
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{
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public:
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enum BlockBoundary
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{
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kBeforeBlock,
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kBlockStart,
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kBlockEnd,
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kAfterBlock
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};
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enum {eBefore = 1};
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enum {eAfter = 1 << 1};
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enum {eBoth = eBefore | eAfter};
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WSRunObject(HTMLEditor* aHTMLEditor, nsINode* aNode, int32_t aOffset);
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WSRunObject(HTMLEditor* aHTMLEditor, nsIDOMNode* aNode, int32_t aOffset);
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~WSRunObject();
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// ScrubBlockBoundary removes any non-visible whitespace at the specified
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// location relative to a block node.
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static nsresult ScrubBlockBoundary(HTMLEditor* aHTMLEditor,
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BlockBoundary aBoundary,
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nsINode* aBlock,
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int32_t aOffset = -1);
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// PrepareToJoinBlocks fixes up ws at the end of aLeftBlock and the
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// beginning of aRightBlock in preperation for them to be joined. Example
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// of fixup: trailingws in aLeftBlock needs to be removed.
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static nsresult PrepareToJoinBlocks(HTMLEditor* aHTMLEditor,
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dom::Element* aLeftBlock,
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dom::Element* aRightBlock);
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// PrepareToDeleteRange fixes up ws before {aStartNode,aStartOffset}
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// and after {aEndNode,aEndOffset} in preperation for content
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// in that range to be deleted. Note that the nodes and offsets
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// are adjusted in response to any dom changes we make while
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// adjusting ws.
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// example of fixup: trailingws before {aStartNode,aStartOffset}
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// needs to be removed.
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static nsresult PrepareToDeleteRange(HTMLEditor* aHTMLEditor,
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nsCOMPtr<nsINode>* aStartNode,
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int32_t* aStartOffset,
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nsCOMPtr<nsINode>* aEndNode,
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int32_t* aEndOffset);
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// PrepareToDeleteNode fixes up ws before and after aContent in preparation
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// for aContent to be deleted. Example of fixup: trailingws before
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// aContent needs to be removed.
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static nsresult PrepareToDeleteNode(HTMLEditor* aHTMLEditor,
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nsIContent* aContent);
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// PrepareToSplitAcrossBlocks fixes up ws before and after
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// {aSplitNode,aSplitOffset} in preparation for a block parent to be split.
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// Note that the aSplitNode and aSplitOffset are adjusted in response to
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// any DOM changes we make while adjusting ws. Example of fixup: normalws
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// before {aSplitNode,aSplitOffset} needs to end with nbsp.
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static nsresult PrepareToSplitAcrossBlocks(HTMLEditor* aHTMLEditor,
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nsCOMPtr<nsINode>* aSplitNode,
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int32_t* aSplitOffset);
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/**
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* InsertBreak() inserts a <br> node at (before) aPointToInsert and delete
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* unnecessary whitespaces around there and/or replaces whitespaces with
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* non-breaking spaces. Note that if the point is in a text node, the
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* text node will be split and insert new <br> node between the left node
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* and the right node.
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*
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* @param aSelection The selection for the editor.
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* @param aPointToInsert The point to insert new <br> element. Note that
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* it'll be inserted before this point. I.e., the
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* point will be the point of new <br>.
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* @param aSelect If eNone, this won't change selection.
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* If eNext, selection will be collapsed after the
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* <br> element.
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* If ePrevious, selection will be collapsed at the
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* <br> element.
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* @return The new <br> node. If failed to create new <br>
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* node, returns nullptr.
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*/
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already_AddRefed<dom::Element>
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InsertBreak(Selection& aSelection,
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const EditorRawDOMPoint& aPointToInsert,
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nsIEditor::EDirection aSelect);
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/**
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* InsertTextImpl() inserts aStringToInsert to aPointToInsert and makes any
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* needed adjustments to white spaces around that point. E.g., trailing white
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* spaces before aPointToInsert needs to be removed.
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* This calls EditorBase::InsertTextImpl() after adjusting white spaces.
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* So, please refer the method's explanation to know what this method exactly
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* does.
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*
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* @param aDocument The document of this editor.
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* @param aStringToInsert The string to insert.
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* @param aPointToInser The point to insert aStringToInsert.
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* Must be valid DOM point.
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* @param aPointAfterInsertedString
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* The point after inserted aStringToInsert.
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* So, when this method actually inserts string,
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* this is set to a point in the text node.
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* Otherwise, this may be set to aPointToInsert.
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* @return When this succeeds to insert the string or
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* does nothing during composition, returns NS_OK.
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* Otherwise, an error code.
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*/
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nsresult InsertText(nsIDocument& aDocument,
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const nsAString& aStringToInsert,
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const EditorRawDOMPoint& aPointToInsert,
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EditorRawDOMPoint* aPointAfterInsertedString = nullptr);
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// DeleteWSBackward deletes a single visible piece of ws before the ws
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// point (the point to create the wsRunObject, passed to its constructor).
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// It makes any needed conversion to adjacent ws to retain its
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// significance.
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nsresult DeleteWSBackward();
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// DeleteWSForward deletes a single visible piece of ws after the ws point
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// (the point to create the wsRunObject, passed to its constructor). It
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// makes any needed conversion to adjacent ws to retain its significance.
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nsresult DeleteWSForward();
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// PriorVisibleNode returns the first piece of visible thing before
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// {aNode,aOffset}. If there is no visible ws qualifying it returns what
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// is before the ws run. Note that {outVisNode,outVisOffset} is set to
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// just AFTER the visible object.
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void PriorVisibleNode(nsINode* aNode,
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int32_t aOffset,
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nsCOMPtr<nsINode>* outVisNode,
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int32_t* outVisOffset,
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WSType* outType);
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// NextVisibleNode returns the first piece of visible thing after
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// {aNode,aOffset}. If there is no visible ws qualifying it returns what
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// is after the ws run. Note that {outVisNode,outVisOffset} is set to just
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// BEFORE the visible object.
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void NextVisibleNode(nsINode* aNode,
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int32_t aOffset,
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nsCOMPtr<nsINode>* outVisNode,
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int32_t* outVisOffset,
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WSType* outType);
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// AdjustWhitespace examines the ws object for nbsp's that can
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// be safely converted to regular ascii space and converts them.
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nsresult AdjustWhitespace();
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protected:
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// WSFragment represents a single run of ws (all leadingws, or all normalws,
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// or all trailingws, or all leading+trailingws). Note that this single run
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// may still span multiple nodes.
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struct WSFragment final
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{
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nsCOMPtr<nsINode> mStartNode; // node where ws run starts
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nsCOMPtr<nsINode> mEndNode; // node where ws run ends
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int32_t mStartOffset; // offset where ws run starts
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int32_t mEndOffset; // offset where ws run ends
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// type of ws, and what is to left and right of it
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WSType mType, mLeftType, mRightType;
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// other ws runs to left or right. may be null.
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WSFragment *mLeft, *mRight;
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WSFragment()
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: mStartOffset(0)
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, mEndOffset(0)
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, mLeft(nullptr)
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, mRight(nullptr)
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{}
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EditorRawDOMPoint StartPoint() const
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{
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return EditorRawDOMPoint(mStartNode, mStartOffset);
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}
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EditorRawDOMPoint EndPoint() const
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{
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return EditorRawDOMPoint(mEndNode, mEndOffset);
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}
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};
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// A WSPoint struct represents a unique location within the ws run. It is
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// always within a textnode that is one of the nodes stored in the list
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// in the wsRunObject. For convenience, the character at that point is also
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// stored in the struct.
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struct MOZ_STACK_CLASS WSPoint final
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{
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RefPtr<dom::Text> mTextNode;
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uint32_t mOffset;
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char16_t mChar;
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WSPoint()
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: mTextNode(nullptr)
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, mOffset(0)
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, mChar(0)
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{}
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WSPoint(dom::Text* aTextNode, int32_t aOffset, char16_t aChar)
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: mTextNode(aTextNode)
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, mOffset(aOffset)
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, mChar(aChar)
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{}
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};
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/**
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* Return the node which we will handle white-space under. This is the
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* closest block within the DOM subtree we're editing, or if none is
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* found, the (inline) root of the editable subtree.
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*/
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nsINode* GetWSBoundingParent();
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nsresult GetWSNodes();
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void GetRuns();
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void ClearRuns();
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void MakeSingleWSRun(WSType aType);
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nsIContent* GetPreviousWSNodeInner(nsINode* aStartNode,
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nsINode* aBlockParent);
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nsIContent* GetPreviousWSNode(const EditorDOMPoint& aPoint,
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nsINode* aBlockParent);
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nsIContent* GetNextWSNodeInner(nsINode* aStartNode, nsINode* aBlockParent);
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nsIContent* GetNextWSNode(const EditorDOMPoint& aPoint,
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nsINode* aBlockParent);
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nsresult PrepareToDeleteRangePriv(WSRunObject* aEndObject);
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nsresult PrepareToSplitAcrossBlocksPriv();
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/**
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* DeleteRange() removes the range between aStartPoint and aEndPoint.
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* When aStartPoint and aEndPoint are same point, does nothing.
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* When aStartPoint and aEndPoint are in same text node, removes characters
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* between them.
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* When aStartPoint is in a text node, removes the text data after the point.
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* When aEndPoint is in a text node, removes the text data before the point.
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* Removes any nodes between them.
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*/
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nsresult DeleteRange(const EditorRawDOMPoint& aStartPoint,
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const EditorRawDOMPoint& aEndPoint);
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/**
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* GetNextCharPoint() returns next character's point of aPoint. If there is
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* no character after aPoint, mTextNode is set to nullptr.
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*/
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WSPoint GetNextCharPoint(const EditorRawDOMPoint& aPoint);
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WSPoint GetNextCharPoint(const WSPoint& aPoint);
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/**
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* GetPreviousCharPoint() returns previous character's point of of aPoint.
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* If there is no character before aPoint, mTextNode is set to nullptr.
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*/
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WSPoint GetPreviousCharPoint(const EditorRawDOMPoint& aPoint);
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WSPoint GetPreviousCharPoint(const WSPoint& aPoint);
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/**
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* GetNextCharPointInternal() and GetPreviousCharPointInternal() are
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* helper methods of GetNextCharPoint(const EditorRawDOMPoint&) and
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* GetPreviousCharPoint(const EditorRawDOMPoint&). When the container
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* isn't in mNodeArray, they call one of these methods. Then, these
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* methods look for nearest text node in mNodeArray from aPoint.
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* Then, will call GetNextCharPoint(const WSPoint&) or
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* GetPreviousCharPoint(const WSPoint&) and returns its result.
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*/
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WSPoint GetNextCharPointInternal(const EditorRawDOMPoint& aPoint);
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WSPoint GetPreviousCharPointInternal(const EditorRawDOMPoint& aPoint);
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/**
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* InsertNBSPAndRemoveFollowingASCIIWhitespaces() inserts an NBSP first.
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* Then, if following characters are ASCII whitespaces, will remove them.
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*/
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nsresult InsertNBSPAndRemoveFollowingASCIIWhitespaces(WSPoint aPoint);
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/**
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* GetASCIIWhitespacesBounds() retrieves whitespaces before and/or after the
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* point specified by aNode and aOffset.
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*
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* @param aDir Specify eBefore if you want to scan text backward.
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* Specify eAfter if you want to scan text forward.
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* Specify eBoth if you want to scan text to both
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* direction.
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* @param aNode The container node where you want to start to scan
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* whitespaces from.
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* @param aOffset The offset in aNode where you want to start to scan
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* whitespaces from.
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* @param outStartNode [out] The container of first ASCII whitespace.
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* If there is no whitespaces, returns nullptr.
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* @param outStartOffset [out] The offset of first ASCII whitespace in
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* outStartNode.
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* @param outEndNode [out] The container of last ASCII whitespace.
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* If there is no whitespaces, returns nullptr.
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* @param outEndOffset [out] The offset of last ASCII whitespace in
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* outEndNode.
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*/
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void GetASCIIWhitespacesBounds(int16_t aDir,
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nsINode* aNode,
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int32_t aOffset,
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dom::Text** outStartNode,
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int32_t* outStartOffset,
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dom::Text** outEndNode,
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int32_t* outEndOffset);
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/**
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* FindNearestRun() looks for a WSFragment which is closest to specified
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* direction from aPoint.
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*
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* @param aPoint The point to start to look for.
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* @param aForward true if caller needs to look for a WSFragment after the
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* point in the DOM tree. Otherwise, i.e., before the
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* point, false.
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* @return Found WSFragment instance.
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* If aForward is true and:
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* if aPoint is end of a run, returns next run.
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* if aPoint is start of a run, returns the run.
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* if aPoint is before the first run, returns the first
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* run.
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* If aPoint is after the last run, returns nullptr.
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* If aForward is false and:
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* if aPoint is end of a run, returns the run.
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* if aPoint is start of a run, returns its next run.
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* if aPoint is before the first run, returns nullptr.
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* if aPoint is after the last run, returns the last run.
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*/
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WSFragment* FindNearestRun(const EditorRawDOMPoint& aPoint, bool aForward);
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char16_t GetCharAt(dom::Text* aTextNode, int32_t aOffset);
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nsresult CheckTrailingNBSPOfRun(WSFragment *aRun);
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/**
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* ReplacePreviousNBSPIfUnncessary() replaces previous character of aPoint
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* if it's a NBSP and it's unnecessary.
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*
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* @param aRun Current text run. aPoint must be in this run.
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* @param aPoint Current insertion point. Its previous character is
|
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* unnecessary NBSP will be checked.
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|
*/
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nsresult ReplacePreviousNBSPIfUnncessary(WSFragment* aRun,
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const EditorRawDOMPoint& aPoint);
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nsresult CheckLeadingNBSP(WSFragment* aRun, nsINode* aNode,
|
|
int32_t aOffset);
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|
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nsresult Scrub();
|
|
bool IsBlockNode(nsINode* aNode);
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EditorRawDOMPoint Point() const
|
|
{
|
|
return EditorRawDOMPoint(mNode, mOffset);
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|
}
|
|
EditorRawDOMPoint StartPoint() const
|
|
{
|
|
return EditorRawDOMPoint(mStartNode, mStartOffset);
|
|
}
|
|
EditorRawDOMPoint EndPoint() const
|
|
{
|
|
return EditorRawDOMPoint(mEndNode, mEndOffset);
|
|
}
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// The node passed to our constructor.
|
|
nsCOMPtr<nsINode> mNode;
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|
// The offset passed to our contructor.
|
|
int32_t mOffset;
|
|
// Together, the above represent the point at which we are building up ws info.
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|
|
// true if we are in preformatted whitespace context.
|
|
bool mPRE;
|
|
// Node/offset where ws starts.
|
|
nsCOMPtr<nsINode> mStartNode;
|
|
int32_t mStartOffset;
|
|
// Reason why ws starts (eText, eOtherBlock, etc.).
|
|
WSType mStartReason;
|
|
// The node that implicated by start reason.
|
|
nsCOMPtr<nsINode> mStartReasonNode;
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|
|
|
// Node/offset where ws ends.
|
|
nsCOMPtr<nsINode> mEndNode;
|
|
int32_t mEndOffset;
|
|
// Reason why ws ends (eText, eOtherBlock, etc.).
|
|
WSType mEndReason;
|
|
// The node that implicated by end reason.
|
|
nsCOMPtr<nsINode> mEndReasonNode;
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|
|
|
// Location of first nbsp in ws run, if any.
|
|
RefPtr<dom::Text> mFirstNBSPNode;
|
|
int32_t mFirstNBSPOffset;
|
|
|
|
// Location of last nbsp in ws run, if any.
|
|
RefPtr<dom::Text> mLastNBSPNode;
|
|
int32_t mLastNBSPOffset;
|
|
|
|
// The list of nodes containing ws in this run.
|
|
nsTArray<RefPtr<dom::Text>> mNodeArray;
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|
|
|
// The first WSFragment in the run.
|
|
WSFragment* mStartRun;
|
|
// The last WSFragment in the run, may be same as first.
|
|
WSFragment* mEndRun;
|
|
|
|
// Non-owning.
|
|
HTMLEditor* mHTMLEditor;
|
|
|
|
// Opening this class up for pillaging.
|
|
friend class HTMLEditRules;
|
|
// Opening this class up for more pillaging.
|
|
friend class HTMLEditor;
|
|
};
|
|
|
|
} // namespace mozilla
|
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|
#endif // #ifndef WSRunObject_h
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