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