Adding upstream version 4:7.4.7.upstream/4%7.4.7upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 486 insertions, 0 deletions

diff --git a/starmath/inc/visitors.hxx b/starmath/inc/visitors.hxx
new file mode 100644
index 000000000..27c4e374e
--- /dev/null
+++ b/starmath/inc/visitors.hxx
@@ -0,0 +1,486 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+/** Visitors are an easy way to automating operations with nodes.
+ *
+ * The available visitors are:
+ * SmVisitor                                base class
+ *      SmDefaultingVisitor                 default visitor
+ *      SmDrawingVisitor                    draws formula
+ *      SmCaretPosGraphBuildingVisitor      position of the node inside starmath code
+ *      SmCloningVisitor                    duplicate nodes
+ *      SmNodeToTextVisitor                 create code from nodes
+ *
+ */
+
+#pragma once
+
+#include <sal/config.h>
+#include <sal/log.hxx>
+
+#include "node.hxx"
+#include "caret.hxx"
+
+/** Base class for visitors that visits a tree of SmNodes
+ * @remarks all methods have been left abstract to ensure that implementers
+ * don't forget to implement one.
+ */
+class SmVisitor
+{
+public:
+    virtual void Visit( SmTableNode* pNode ) = 0;
+    virtual void Visit( SmBraceNode* pNode ) = 0;
+    virtual void Visit( SmBracebodyNode* pNode ) = 0;
+    virtual void Visit( SmOperNode* pNode ) = 0;
+    virtual void Visit( SmAlignNode* pNode ) = 0;
+    virtual void Visit( SmAttributeNode* pNode ) = 0;
+    virtual void Visit( SmFontNode* pNode ) = 0;
+    virtual void Visit( SmUnHorNode* pNode ) = 0;
+    virtual void Visit( SmBinHorNode* pNode ) = 0;
+    virtual void Visit( SmBinVerNode* pNode ) = 0;
+    virtual void Visit( SmBinDiagonalNode* pNode ) = 0;
+    virtual void Visit( SmSubSupNode* pNode ) = 0;
+    virtual void Visit( SmMatrixNode* pNode ) = 0;
+    virtual void Visit( SmPlaceNode* pNode ) = 0;
+    virtual void Visit( SmTextNode* pNode ) = 0;
+    virtual void Visit( SmSpecialNode* pNode ) = 0;
+    virtual void Visit( SmGlyphSpecialNode* pNode ) = 0;
+    virtual void Visit( SmMathSymbolNode* pNode ) = 0;
+    virtual void Visit( SmBlankNode* pNode ) = 0;
+    virtual void Visit( SmErrorNode* pNode ) = 0;
+    virtual void Visit( SmLineNode* pNode ) = 0;
+    virtual void Visit( SmExpressionNode* pNode ) = 0;
+    virtual void Visit( SmPolyLineNode* pNode ) = 0;
+    virtual void Visit( SmRootNode* pNode ) = 0;
+    virtual void Visit( SmRootSymbolNode* pNode ) = 0;
+    virtual void Visit( SmRectangleNode* pNode ) = 0;
+    virtual void Visit( SmVerticalBraceNode* pNode ) = 0;
+
+protected:
+    ~SmVisitor() {}
+};
+
+// SmDefaultingVisitor
+
+
+/** Visitor that uses DefaultVisit for handling visits by default
+ *
+ * This abstract baseclass is useful for visitors where many methods share the same
+ * implementation.
+ */
+class SmDefaultingVisitor : public SmVisitor
+{
+public:
+    void Visit( SmTableNode* pNode ) override;
+    void Visit( SmBraceNode* pNode ) override;
+    void Visit( SmBracebodyNode* pNode ) override;
+    void Visit( SmOperNode* pNode ) override;
+    void Visit( SmAlignNode* pNode ) override;
+    void Visit( SmAttributeNode* pNode ) override;
+    void Visit( SmFontNode* pNode ) override;
+    void Visit( SmUnHorNode* pNode ) override;
+    void Visit( SmBinHorNode* pNode ) override;
+    void Visit( SmBinVerNode* pNode ) override;
+    void Visit( SmBinDiagonalNode* pNode ) override;
+    void Visit( SmSubSupNode* pNode ) override;
+    void Visit( SmMatrixNode* pNode ) override;
+    void Visit( SmPlaceNode* pNode ) override;
+    void Visit( SmTextNode* pNode ) override;
+    void Visit( SmSpecialNode* pNode ) override;
+    void Visit( SmGlyphSpecialNode* pNode ) override;
+    void Visit( SmMathSymbolNode* pNode ) override;
+    void Visit( SmBlankNode* pNode ) override;
+    void Visit( SmErrorNode* pNode ) override;
+    void Visit( SmLineNode* pNode ) override;
+    void Visit( SmExpressionNode* pNode ) override;
+    void Visit( SmPolyLineNode* pNode ) override;
+    void Visit( SmRootNode* pNode ) override;
+    void Visit( SmRootSymbolNode* pNode ) override;
+    void Visit( SmRectangleNode* pNode ) override;
+    void Visit( SmVerticalBraceNode* pNode ) override;
+protected:
+    ~SmDefaultingVisitor() {}
+
+    /** Method invoked by Visit methods by default */
+    virtual void DefaultVisit( SmNode* pNode ) = 0;
+};
+
+// SmCaretDrawingVisitor
+
+/** Visitor for drawing a caret position */
+class SmCaretDrawingVisitor final : public SmDefaultingVisitor
+{
+public:
+    /** Given position and device this constructor will draw the caret */
+    SmCaretDrawingVisitor( OutputDevice& rDevice, SmCaretPos position, Point offset, bool caretVisible );
+    virtual ~SmCaretDrawingVisitor() {}
+    void Visit( SmTextNode* pNode ) override;
+    using SmDefaultingVisitor::Visit;
+private:
+    OutputDevice &mrDev;
+    SmCaretPos maPos;
+    /** Offset to draw from */
+    Point  maOffset;
+    bool  mbCaretVisible;
+
+    /** Default method for drawing pNodes */
+    void DefaultVisit( SmNode* pNode ) override;
+};
+
+// SmCaretPos2LineVisitor
+
+/** Visitor getting a line from a caret position */
+class SmCaretPos2LineVisitor final : public SmDefaultingVisitor
+{
+public:
+    /** Given position and device this constructor will compute a line for the caret */
+    SmCaretPos2LineVisitor( OutputDevice *pDevice, SmCaretPos position )
+        : mpDev( pDevice )
+        , maPos( position )
+    {
+        SAL_WARN_IF( !position.IsValid(), "starmath", "Cannot draw invalid position!" );
+
+        maPos.pSelectedNode->Accept( this );
+    }
+    virtual ~SmCaretPos2LineVisitor() {}
+    void Visit( SmTextNode* pNode ) override;
+    using SmDefaultingVisitor::Visit;
+    const SmCaretLine& GetResult( ) const {
+        return maLine;
+    }
+private:
+    SmCaretLine maLine;
+    VclPtr<OutputDevice> mpDev;
+    SmCaretPos maPos;
+
+    /** Default method for computing lines for pNodes */
+    void DefaultVisit( SmNode* pNode ) override;
+};
+
+// SmDrawingVisitor
+
+/** Visitor for drawing SmNodes to OutputDevice */
+class SmDrawingVisitor final : public SmVisitor
+{
+public:
+    /** Create an instance of SmDrawingVisitor, and use it to draw a formula
+     * @param rDevice   Device to draw on
+     * @param position  Offset on device to draw the formula
+     * @param pTree     Formula tree to draw
+     * @remarks This constructor will do the drawing, no need to anything more.
+     */
+    SmDrawingVisitor( OutputDevice &rDevice, Point position, SmNode* pTree )
+        : mrDev( rDevice )
+        , maPosition( position )
+    {
+        pTree->Accept( this );
+    }
+    virtual ~SmDrawingVisitor() {}
+    void Visit( SmTableNode* pNode ) override;
+    void Visit( SmBraceNode* pNode ) override;
+    void Visit( SmBracebodyNode* pNode ) override;
+    void Visit( SmOperNode* pNode ) override;
+    void Visit( SmAlignNode* pNode ) override;
+    void Visit( SmAttributeNode* pNode ) override;
+    void Visit( SmFontNode* pNode ) override;
+    void Visit( SmUnHorNode* pNode ) override;
+    void Visit( SmBinHorNode* pNode ) override;
+    void Visit( SmBinVerNode* pNode ) override;
+    void Visit( SmBinDiagonalNode* pNode ) override;
+    void Visit( SmSubSupNode* pNode ) override;
+    void Visit( SmMatrixNode* pNode ) override;
+    void Visit( SmPlaceNode* pNode ) override;
+    void Visit( SmTextNode* pNode ) override;
+    void Visit( SmSpecialNode* pNode ) override;
+    void Visit( SmGlyphSpecialNode* pNode ) override;
+    void Visit( SmMathSymbolNode* pNode ) override;
+    void Visit( SmBlankNode* pNode ) override;
+    void Visit( SmErrorNode* pNode ) override;
+    void Visit( SmLineNode* pNode ) override;
+    void Visit( SmExpressionNode* pNode ) override;
+    void Visit( SmPolyLineNode* pNode ) override;
+    void Visit( SmRootNode* pNode ) override;
+    void Visit( SmRootSymbolNode* pNode ) override;
+    void Visit( SmRectangleNode* pNode ) override;
+    void Visit( SmVerticalBraceNode* pNode ) override;
+private:
+    /** Draw the children of a pNode
+     * This the default method, use by most pNodes
+     */
+    void DrawChildren( SmStructureNode* pNode );
+
+    /** Draw an SmTextNode or a subclass of this */
+    void DrawTextNode( SmTextNode* pNode );
+    /** Draw an SmSpecialNode or a subclass of this  */
+    void DrawSpecialNode( SmSpecialNode* pNode );
+    /** OutputDevice to draw on */
+    OutputDevice& mrDev;
+    /** Position to draw on the mrDev
+     * @remarks This variable is used to pass parameters in DrawChildren( ), this means
+                that after a call to DrawChildren( ) the contents of this method is undefined
+                so if needed cache it locally on the stack.
+     */
+    Point maPosition;
+};
+
+// SmSetSelectionVisitor
+
+/** Set Selection Visitor
+ * Sets the IsSelected( ) property on all SmNodes of the tree
+ */
+class SmSetSelectionVisitor final : public SmDefaultingVisitor
+{
+public:
+    SmSetSelectionVisitor( SmCaretPos startPos, SmCaretPos endPos, SmNode* pNode);
+    virtual ~SmSetSelectionVisitor() {}
+    void Visit( SmBinHorNode* pNode ) override;
+    void Visit( SmUnHorNode* pNode ) override;
+    void Visit( SmFontNode* pNode ) override;
+    void Visit( SmTextNode* pNode ) override;
+    void Visit( SmExpressionNode* pNode ) override;
+    void Visit( SmLineNode* pNode ) override;
+    void Visit( SmAlignNode* pNode ) override;
+    using SmDefaultingVisitor::Visit;
+    /** Set IsSelected on all pNodes of pSubTree */
+    static void SetSelectedOnAll( SmNode* pSubTree, bool IsSelected = true );
+private:
+    /** Visit a selectable pNode
+     * Can be used to handle pNodes that can be selected, that doesn't have more SmCaretPos'
+     * than 0 and 1 inside them. SmTextNode should be handle separately!
+     * Also note that pNodes such as SmBinVerNode cannot be selected, don't this method for
+     * it.
+     */
+    void DefaultVisit( SmNode* pNode ) override;
+    void VisitCompositionNode( SmStructureNode* pNode );
+    /** Caret position where the selection starts */
+    SmCaretPos maStartPos;
+    /** Caret position where the selection ends */
+    SmCaretPos maEndPos;
+    /** The current state of this visitor
+     * This property changes when the visitor meets either maStartPos
+     * or maEndPos. This means that anything visited in between will be
+     * selected.
+     */
+    bool mbSelecting;
+};
+
+
+// SmCaretPosGraphBuildingVisitor
+
+
+/** A visitor for building a SmCaretPosGraph
+ *
+ * Visit invariant:
+ * Each pNode, except SmExpressionNode, SmBinHorNode and a few others, constitutes an entry
+ * in a line. Consider the line entry "H", this entry creates one carat position, here
+ * denoted by | in "H|".
+ *
+ * Parameter variables:
+ *  The following variables are used to transfer parameters into calls and results out
+ *  of calls.
+ *      pRightMost : SmCaretPosGraphEntry*
+ *
+ * Prior to a Visit call:
+ *  pRightMost: A pointer to right most position in front of the current line entry.
+ *
+ * After a Visit call:
+ *  pRightMost: A pointer to the right most position in the called line entry, if no there's
+ *              no caret positions in called line entry don't change this variable.
+ */
+class SmCaretPosGraphBuildingVisitor final : public SmVisitor
+{
+public:
+    /** Builds a caret position graph for pRootNode */
+    explicit SmCaretPosGraphBuildingVisitor( SmNode* pRootNode );
+    virtual ~SmCaretPosGraphBuildingVisitor();
+    void Visit( SmTableNode* pNode ) override;
+    void Visit( SmBraceNode* pNode ) override;
+    void Visit( SmBracebodyNode* pNode ) override;
+    void Visit( SmOperNode* pNode ) override;
+    void Visit( SmAlignNode* pNode ) override;
+    void Visit( SmAttributeNode* pNode ) override;
+    void Visit( SmFontNode* pNode ) override;
+    void Visit( SmUnHorNode* pNode ) override;
+    void Visit( SmBinHorNode* pNode ) override;
+    void Visit( SmBinVerNode* pNode ) override;
+    void Visit( SmBinDiagonalNode* pNode ) override;
+    void Visit( SmSubSupNode* pNode ) override;
+    void Visit( SmMatrixNode* pNode ) override;
+    void Visit( SmPlaceNode* pNode ) override;
+    void Visit( SmTextNode* pNode ) override;
+    void Visit( SmSpecialNode* pNode ) override;
+    void Visit( SmGlyphSpecialNode* pNode ) override;
+    void Visit( SmMathSymbolNode* pNode ) override;
+    void Visit( SmBlankNode* pNode ) override;
+    void Visit( SmErrorNode* pNode ) override;
+    void Visit( SmLineNode* pNode ) override;
+    void Visit( SmExpressionNode* pNode ) override;
+    void Visit( SmPolyLineNode* pNode ) override;
+    void Visit( SmRootNode* pNode ) override;
+    void Visit( SmRootSymbolNode* pNode ) override;
+    void Visit( SmRectangleNode* pNode ) override;
+    void Visit( SmVerticalBraceNode* pNode ) override;
+    SmCaretPosGraph* takeGraph()
+    {
+        return mpGraph.release();
+    }
+private:
+    SmCaretPosGraphEntry* mpRightMost;
+    std::unique_ptr<SmCaretPosGraph> mpGraph;
+};
+
+// SmCloningVisitor
+
+/** Visitor for cloning a pNode
+ *
+ * This visitor creates deep clones.
+ */
+class SmCloningVisitor final : public SmVisitor
+{
+public:
+    SmCloningVisitor()
+        : mpResult(nullptr)
+    {}
+    virtual ~SmCloningVisitor() {}
+    void Visit( SmTableNode* pNode ) override;
+    void Visit( SmBraceNode* pNode ) override;
+    void Visit( SmBracebodyNode* pNode ) override;
+    void Visit( SmOperNode* pNode ) override;
+    void Visit( SmAlignNode* pNode ) override;
+    void Visit( SmAttributeNode* pNode ) override;
+    void Visit( SmFontNode* pNode ) override;
+    void Visit( SmUnHorNode* pNode ) override;
+    void Visit( SmBinHorNode* pNode ) override;
+    void Visit( SmBinVerNode* pNode ) override;
+    void Visit( SmBinDiagonalNode* pNode ) override;
+    void Visit( SmSubSupNode* pNode ) override;
+    void Visit( SmMatrixNode* pNode ) override;
+    void Visit( SmPlaceNode* pNode ) override;
+    void Visit( SmTextNode* pNode ) override;
+    void Visit( SmSpecialNode* pNode ) override;
+    void Visit( SmGlyphSpecialNode* pNode ) override;
+    void Visit( SmMathSymbolNode* pNode ) override;
+    void Visit( SmBlankNode* pNode ) override;
+    void Visit( SmErrorNode* pNode ) override;
+    void Visit( SmLineNode* pNode ) override;
+    void Visit( SmExpressionNode* pNode ) override;
+    void Visit( SmPolyLineNode* pNode ) override;
+    void Visit( SmRootNode* pNode ) override;
+    void Visit( SmRootSymbolNode* pNode ) override;
+    void Visit( SmRectangleNode* pNode ) override;
+    void Visit( SmVerticalBraceNode* pNode ) override;
+    /** Clone a pNode */
+    SmNode* Clone( SmNode* pNode );
+private:
+    SmNode* mpResult;
+    /** Clone children of pSource and give them to pTarget */
+    void CloneKids( SmStructureNode* pSource, SmStructureNode* pTarget );
+    /** Clone attributes on a pNode */
+    static void CloneNodeAttr( SmNode const * pSource, SmNode* pTarget );
+};
+
+
+// SmSelectionDrawingVisitor
+
+class SmSelectionDrawingVisitor final : public SmDefaultingVisitor
+{
+public:
+    /** Draws a selection on rDevice for the selection on pTree */
+    SmSelectionDrawingVisitor( OutputDevice& rDevice, SmNode* pTree, const Point& rOffset );
+    virtual ~SmSelectionDrawingVisitor() {}
+    void Visit( SmTextNode* pNode ) override;
+    using SmDefaultingVisitor::Visit;
+private:
+    /** Reference to drawing device */
+    OutputDevice& mrDev;
+    /** True if  aSelectionArea have been initialized */
+    bool mbHasSelectionArea;
+    /** The current area that is selected */
+    tools::Rectangle maSelectionArea;
+    /** Extend the area that must be selected  */
+    void ExtendSelectionArea(const tools::Rectangle& rArea);
+    /** Default visiting method */
+    void DefaultVisit( SmNode* pNode ) override;
+    /** Visit the children of a given pNode */
+    void VisitChildren( SmNode* pNode );
+};
+
+// SmNodeToTextVisitor
+
+/** Extract command text from pNodes */
+class SmNodeToTextVisitor final : public SmVisitor
+{
+public:
+    SmNodeToTextVisitor( SmNode* pNode, OUString &rText );
+    virtual ~SmNodeToTextVisitor() {}
+
+    void Visit( SmTableNode* pNode ) override;
+    void Visit( SmBraceNode* pNode ) override;
+    void Visit( SmBracebodyNode* pNode ) override;
+    void Visit( SmOperNode* pNode ) override;
+    void Visit( SmAlignNode* pNode ) override;
+    void Visit( SmAttributeNode* pNode ) override;
+    void Visit( SmFontNode* pNode ) override;
+    void Visit( SmUnHorNode* pNode ) override;
+    void Visit( SmBinHorNode* pNode ) override;
+    void Visit( SmBinVerNode* pNode ) override;
+    void Visit( SmBinDiagonalNode* pNode ) override;
+    void Visit( SmSubSupNode* pNode ) override;
+    void Visit( SmMatrixNode* pNode ) override;
+    void Visit( SmPlaceNode* pNode ) override;
+    void Visit( SmTextNode* pNode ) override;
+    void Visit( SmSpecialNode* pNode ) override;
+    void Visit( SmGlyphSpecialNode* pNode ) override;
+    void Visit( SmMathSymbolNode* pNode ) override;
+    void Visit( SmBlankNode* pNode ) override;
+    void Visit( SmErrorNode* pNode ) override;
+    void Visit( SmLineNode* pNode ) override;
+    void Visit( SmExpressionNode* pNode ) override;
+    void Visit( SmPolyLineNode* pNode ) override;
+    void Visit( SmRootNode* pNode ) override;
+    void Visit( SmRootSymbolNode* pNode ) override;
+    void Visit( SmRectangleNode* pNode ) override;
+    void Visit( SmVerticalBraceNode* pNode ) override;
+private:
+
+    /**
+      * Extract text from a pNode that constitutes a line.
+      * @param pNode
+      * @return
+      */
+    void LineToText( SmNode* pNode ) {
+        Separate( );
+        if( pNode ) pNode->Accept( this );
+        Separate( );
+    }
+
+    /**
+      * Appends rText to the OUStringBuffer ( maCmdText ).
+      * @param rText
+      * @return
+      */
+    void Append( std::u16string_view rText ) {
+        maCmdText.append( rText );
+    }
+
+    /**
+     * Append a blank for separation, if needed.
+     * It is needed if last char is not ' '.
+     * @return
+     */
+    void Separate( ){
+        if( !maCmdText.isEmpty() && maCmdText[ maCmdText.getLength() - 1 ] != ' ' )
+            maCmdText.append(' ');
+    }
+
+    /** Output text generated from the pNodes */
+    OUStringBuffer maCmdText;
+};
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */