128 lines
4.3 KiB
C++
128 lines
4.3 KiB
C++
// © 2016 and later: Unicode, Inc. and others.
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// License & terms of use: http://www.unicode.org/copyright.html
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/********************************************************************
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* COPYRIGHT:
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* Copyright (c) 2001-2016, International Business Machines Corporation and
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* others. All Rights Reserved.
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********************************************************************/
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#ifndef RBBINODE_H
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#define RBBINODE_H
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#include "unicode/utypes.h"
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#include "unicode/unistr.h"
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#include "unicode/uobject.h"
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//
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// class RBBINode
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//
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// Represents a node in the parse tree generated when reading
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// a rule file.
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//
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U_NAMESPACE_BEGIN
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class UnicodeSet;
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class UVector;
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class RBBINode : public UMemory {
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public:
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enum NodeType {
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setRef,
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uset,
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varRef,
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leafChar,
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lookAhead,
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tag,
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endMark,
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opStart,
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opCat,
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opOr,
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opStar,
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opPlus,
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opQuestion,
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opBreak,
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opReverse,
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opLParen
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};
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enum OpPrecedence {
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precZero,
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precStart,
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precLParen,
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precOpOr,
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precOpCat
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};
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NodeType fType;
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RBBINode *fParent;
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RBBINode *fLeftChild;
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RBBINode *fRightChild;
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UnicodeSet *fInputSet; // For uset nodes only.
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OpPrecedence fPrecedence; // For binary ops only.
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UnicodeString fText; // Text corresponding to this node.
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// May be lazily evaluated when (if) needed
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// for some node types.
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int fFirstPos; // Position in the rule source string of the
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// first text associated with the node.
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// If there's a left child, this will be the same
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// as that child's left pos.
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int fLastPos; // Last position in the rule source string
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// of any text associated with this node.
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// If there's a right child, this will be the same
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// as that child's last postion.
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UBool fNullable; // See Aho.
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int32_t fVal; // For leafChar nodes, the value.
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// Values are the character category,
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// corresponds to columns in the final
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// state transition table.
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UBool fLookAheadEnd; // For endMark nodes, set true if
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// marking the end of a look-ahead rule.
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UBool fRuleRoot; // True if this node is the root of a rule.
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UBool fChainIn; // True if chaining into this rule is allowed
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// (no '^' present).
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UVector *fFirstPosSet;
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UVector *fLastPosSet; // TODO: rename fFirstPos & fLastPos to avoid confusion.
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UVector *fFollowPos;
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RBBINode(NodeType t);
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RBBINode(const RBBINode &other);
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~RBBINode();
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RBBINode *cloneTree();
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RBBINode *flattenVariables();
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void flattenSets();
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void findNodes(UVector *dest, RBBINode::NodeType kind, UErrorCode &status);
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#ifdef RBBI_DEBUG
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static void printNodeHeader();
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static void printNode(const RBBINode *n);
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static void printTree(const RBBINode *n, UBool withHeading);
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#endif
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private:
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RBBINode &operator = (const RBBINode &other); // No defs.
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UBool operator == (const RBBINode &other); // Private, so these functions won't accidently be used.
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#ifdef RBBI_DEBUG
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public:
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int fSerialNum; // Debugging aids.
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#endif
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};
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#ifdef RBBI_DEBUG
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U_CFUNC void
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RBBI_DEBUG_printUnicodeString(const UnicodeString &s, int minWidth=0);
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#endif
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U_NAMESPACE_END
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#endif
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