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/*
*******************************************************************************
* Copyright (C) 2010-2012, International Business Machines
* Corporation and others. All Rights Reserved.
*******************************************************************************
* file name: stringtriebuilder.h
* encoding: US-ASCII
* tab size: 8 (not used)
* indentation:4
*
* created on: 2010dec24
* created by: Markus W. Scherer
*/
#ifndef __STRINGTRIEBUILDER_H__
#define __STRINGTRIEBUILDER_H__
#include "unicode/utypes.h"
#include "unicode/uobject.h"
/**
* \file
* \brief C++ API: Builder API for trie builders
*/
// Forward declaration.
struct UHashtable;
typedef struct UHashtable UHashtable;
/**
* Build options for BytesTrieBuilder and CharsTrieBuilder.
* @stable ICU 4.8
*/
enum UStringTrieBuildOption {
/**
* Builds a trie quickly.
* @stable ICU 4.8
*/
USTRINGTRIE_BUILD_FAST,
/**
* Builds a trie more slowly, attempting to generate
* a shorter but equivalent serialization.
* This build option also uses more memory.
*
* This option can be effective when many integer values are the same
* and string/byte sequence suffixes can be shared.
* Runtime speed is not expected to improve.
* @stable ICU 4.8
*/
USTRINGTRIE_BUILD_SMALL
};
U_NAMESPACE_BEGIN
/**
* Base class for string trie builder classes.
*
* This class is not intended for public subclassing.
* @stable ICU 4.8
*/
class U_COMMON_API StringTrieBuilder : public UObject {
public:
#ifndef U_HIDE_INTERNAL_API
/** @internal */
static UBool hashNode(const void *node);
/** @internal */
static UBool equalNodes(const void *left, const void *right);
#endif /* U_HIDE_INTERNAL_API */
protected:
// Do not enclose the protected default constructor with #ifndef U_HIDE_INTERNAL_API
// or else the compiler will create a public default constructor.
/** @internal */
StringTrieBuilder();
/** @internal */
virtual ~StringTrieBuilder();
#ifndef U_HIDE_INTERNAL_API
/** @internal */
void createCompactBuilder(int32_t sizeGuess, UErrorCode &errorCode);
/** @internal */
void deleteCompactBuilder();
/** @internal */
void build(UStringTrieBuildOption buildOption, int32_t elementsLength, UErrorCode &errorCode);
/** @internal */
int32_t writeNode(int32_t start, int32_t limit, int32_t unitIndex);
/** @internal */
int32_t writeBranchSubNode(int32_t start, int32_t limit, int32_t unitIndex, int32_t length);
#endif /* U_HIDE_INTERNAL_API */
class Node;
#ifndef U_HIDE_INTERNAL_API
/** @internal */
Node *makeNode(int32_t start, int32_t limit, int32_t unitIndex, UErrorCode &errorCode);
/** @internal */
Node *makeBranchSubNode(int32_t start, int32_t limit, int32_t unitIndex,
int32_t length, UErrorCode &errorCode);
#endif /* U_HIDE_INTERNAL_API */
/** @internal */
virtual int32_t getElementStringLength(int32_t i) const = 0;
/** @internal */
virtual UChar getElementUnit(int32_t i, int32_t unitIndex) const = 0;
/** @internal */
virtual int32_t getElementValue(int32_t i) const = 0;
// Finds the first unit index after this one where
// the first and last element have different units again.
/** @internal */
virtual int32_t getLimitOfLinearMatch(int32_t first, int32_t last, int32_t unitIndex) const = 0;
// Number of different units at unitIndex.
/** @internal */
virtual int32_t countElementUnits(int32_t start, int32_t limit, int32_t unitIndex) const = 0;
/** @internal */
virtual int32_t skipElementsBySomeUnits(int32_t i, int32_t unitIndex, int32_t count) const = 0;
/** @internal */
virtual int32_t indexOfElementWithNextUnit(int32_t i, int32_t unitIndex, UChar unit) const = 0;
/** @internal */
virtual UBool matchNodesCanHaveValues() const = 0;
/** @internal */
virtual int32_t getMaxBranchLinearSubNodeLength() const = 0;
/** @internal */
virtual int32_t getMinLinearMatch() const = 0;
/** @internal */
virtual int32_t getMaxLinearMatchLength() const = 0;
#ifndef U_HIDE_INTERNAL_API
// max(BytesTrie::kMaxBranchLinearSubNodeLength, UCharsTrie::kMaxBranchLinearSubNodeLength).
/** @internal */
static const int32_t kMaxBranchLinearSubNodeLength=5;
// Maximum number of nested split-branch levels for a branch on all 2^16 possible UChar units.
// log2(2^16/kMaxBranchLinearSubNodeLength) rounded up.
/** @internal */
static const int32_t kMaxSplitBranchLevels=14;
/**
* Makes sure that there is only one unique node registered that is
* equivalent to newNode.
* @param newNode Input node. The builder takes ownership.
* @param errorCode ICU in/out UErrorCode.
Set to U_MEMORY_ALLOCATION_ERROR if it was success but newNode==NULL.
* @return newNode if it is the first of its kind, or
* an equivalent node if newNode is a duplicate.
* @internal
*/
Node *registerNode(Node *newNode, UErrorCode &errorCode);
/**
* Makes sure that there is only one unique FinalValueNode registered
* with this value.
* Avoids creating a node if the value is a duplicate.
* @param value A final value.
* @param errorCode ICU in/out UErrorCode.
Set to U_MEMORY_ALLOCATION_ERROR if it was success but newNode==NULL.
* @return A FinalValueNode with the given value.
* @internal
*/
Node *registerFinalValue(int32_t value, UErrorCode &errorCode);
/*
* C++ note:
* registerNode() and registerFinalValue() take ownership of their input nodes,
* and only return owned nodes.
* If they see a failure UErrorCode, they will delete the input node.
* If they get a NULL pointer, they will record a U_MEMORY_ALLOCATION_ERROR.
* If there is a failure, they return NULL.
*
* NULL Node pointers can be safely passed into other Nodes because
* they call the static Node::hashCode() which checks for a NULL pointer first.
*
* Therefore, as long as builder functions register a new node,
* they need to check for failures only before explicitly dereferencing
* a Node pointer, or before setting a new UErrorCode.
*/
// Hash set of nodes, maps from nodes to integer 1.
/** @internal */
UHashtable *nodes;
/** @internal */
class Node : public UObject {
public:
Node(int32_t initialHash) : hash(initialHash), offset(0) {}
inline int32_t hashCode() const { return hash; }
// Handles node==NULL.
static inline int32_t hashCode(const Node *node) { return node==NULL ? 0 : node->hashCode(); }
// Base class operator==() compares the actual class types.
virtual UBool operator==(const Node &other) const;
inline UBool operator!=(const Node &other) const { return !operator==(other); }
/**
* Traverses the Node graph and numbers branch edges, with rightmost edges first.
* This is to avoid writing a duplicate node twice.
*
* Branch nodes in this trie data structure are not symmetric.
* Most branch edges "jump" to other nodes but the rightmost branch edges
* just continue without a jump.
* Therefore, write() must write the rightmost branch edge last
* (trie units are written backwards), and must write it at that point even if
* it is a duplicate of a node previously written elsewhere.
*
* This function visits and marks right branch edges first.
* Edges are numbered with increasingly negative values because we share the
* offset field which gets positive values when nodes are written.
* A branch edge also remembers the first number for any of its edges.
*
* When a further-left branch edge has a number in the range of the rightmost
* edge's numbers, then it will be written as part of the required right edge
* and we can avoid writing it first.
*
* After root.markRightEdgesFirst(-1) the offsets of all nodes are negative
* edge numbers.
*
* @param edgeNumber The first edge number for this node and its sub-nodes.
* @return An edge number that is at least the maximum-negative
* of the input edge number and the numbers of this node and all of its sub-nodes.
*/
virtual int32_t markRightEdgesFirst(int32_t edgeNumber);
// write() must set the offset to a positive value.
virtual void write(StringTrieBuilder &builder) = 0;
// See markRightEdgesFirst.
inline void writeUnlessInsideRightEdge(int32_t firstRight, int32_t lastRight,
StringTrieBuilder &builder) {
// Note: Edge numbers are negative, lastRight<=firstRight.
// If offset>0 then this node and its sub-nodes have been written already
// and we need not write them again.
// If this node is part of the unwritten right branch edge,
// then we wait until that is written.
if(offset<0 && (offset<lastRight || firstRight<offset)) {
write(builder);
}
}
inline int32_t getOffset() const { return offset; }
protected:
int32_t hash;
int32_t offset;
private:
// No ICU "poor man's RTTI" for this class nor its subclasses.
virtual UClassID getDynamicClassID() const;
};
// This class should not be overridden because
// registerFinalValue() compares a stack-allocated FinalValueNode
// (stack-allocated so that we don't unnecessarily create lots of duplicate nodes)
// with the input node, and the
// !Node::operator==(other) used inside FinalValueNode::operator==(other)
// will be false if the typeid's are different.
/** @internal */
class FinalValueNode : public Node {
public:
FinalValueNode(int32_t v) : Node(0x111111*37+v), value(v) {}
virtual UBool operator==(const Node &other) const;
virtual void write(StringTrieBuilder &builder);
protected:
int32_t value;
};
/**
* @internal
*/
class ValueNode : public Node {
public:
ValueNode(int32_t initialHash) : Node(initialHash), hasValue(FALSE), value(0) {}
virtual UBool operator==(const Node &other) const;
void setValue(int32_t v) {
hasValue=TRUE;
value=v;
hash=hash*37+v;
}
protected:
UBool hasValue;
int32_t value;
};
/**
* @internal
*/
class IntermediateValueNode : public ValueNode {
public:
IntermediateValueNode(int32_t v, Node *nextNode)
: ValueNode(0x222222*37+hashCode(nextNode)), next(nextNode) { setValue(v); }
virtual UBool operator==(const Node &other) const;
virtual int32_t markRightEdgesFirst(int32_t edgeNumber);
virtual void write(StringTrieBuilder &builder);
protected:
Node *next;
};
/**
* @internal
*/
class LinearMatchNode : public ValueNode {
public:
LinearMatchNode(int32_t len, Node *nextNode)
: ValueNode((0x333333*37+len)*37+hashCode(nextNode)),
length(len), next(nextNode) {}
virtual UBool operator==(const Node &other) const;
virtual int32_t markRightEdgesFirst(int32_t edgeNumber);
protected:
int32_t length;
Node *next;
};
/**
* @internal
*/
class BranchNode : public Node {
public:
BranchNode(int32_t initialHash) : Node(initialHash) {}
protected:
int32_t firstEdgeNumber;
};
/**
* @internal
*/
class ListBranchNode : public BranchNode {
public:
ListBranchNode() : BranchNode(0x444444), length(0) {}
virtual UBool operator==(const Node &other) const;
virtual int32_t markRightEdgesFirst(int32_t edgeNumber);
virtual void write(StringTrieBuilder &builder);
// Adds a unit with a final value.
void add(int32_t c, int32_t value) {
units[length]=(UChar)c;
equal[length]=NULL;
values[length]=value;
++length;
hash=(hash*37+c)*37+value;
}
// Adds a unit which leads to another match node.
void add(int32_t c, Node *node) {
units[length]=(UChar)c;
equal[length]=node;
values[length]=0;
++length;
hash=(hash*37+c)*37+hashCode(node);
}
protected:
Node *equal[kMaxBranchLinearSubNodeLength]; // NULL means "has final value".
int32_t length;
int32_t values[kMaxBranchLinearSubNodeLength];
UChar units[kMaxBranchLinearSubNodeLength];
};
/**
* @internal
*/
class SplitBranchNode : public BranchNode {
public:
SplitBranchNode(UChar middleUnit, Node *lessThanNode, Node *greaterOrEqualNode)
: BranchNode(((0x555555*37+middleUnit)*37+
hashCode(lessThanNode))*37+hashCode(greaterOrEqualNode)),
unit(middleUnit), lessThan(lessThanNode), greaterOrEqual(greaterOrEqualNode) {}
virtual UBool operator==(const Node &other) const;
virtual int32_t markRightEdgesFirst(int32_t edgeNumber);
virtual void write(StringTrieBuilder &builder);
protected:
UChar unit;
Node *lessThan;
Node *greaterOrEqual;
};
// Branch head node, for writing the actual node lead unit.
/** @internal */
class BranchHeadNode : public ValueNode {
public:
BranchHeadNode(int32_t len, Node *subNode)
: ValueNode((0x666666*37+len)*37+hashCode(subNode)),
length(len), next(subNode) {}
virtual UBool operator==(const Node &other) const;
virtual int32_t markRightEdgesFirst(int32_t edgeNumber);
virtual void write(StringTrieBuilder &builder);
protected:
int32_t length;
Node *next; // A branch sub-node.
};
#endif /* U_HIDE_INTERNAL_API */
/** @internal */
virtual Node *createLinearMatchNode(int32_t i, int32_t unitIndex, int32_t length,
Node *nextNode) const = 0;
/** @internal */
virtual int32_t write(int32_t unit) = 0;
/** @internal */
virtual int32_t writeElementUnits(int32_t i, int32_t unitIndex, int32_t length) = 0;
/** @internal */
virtual int32_t writeValueAndFinal(int32_t i, UBool isFinal) = 0;
/** @internal */
virtual int32_t writeValueAndType(UBool hasValue, int32_t value, int32_t node) = 0;
/** @internal */
virtual int32_t writeDeltaTo(int32_t jumpTarget) = 0;
private:
// No ICU "poor man's RTTI" for this class nor its subclasses.
virtual UClassID getDynamicClassID() const;
};
U_NAMESPACE_END
#endif // __STRINGTRIEBUILDER_H__