|
|
| version 1.5, 2001/01/29 10:22:01 | version 1.89, 2015/09/24 21:28:19 |
|---|---|
| Line 1 | Line 1 |
| /* | /** @file |
| $Id$ | Parser: hash class decl. |
| */ | |
| /* | Copyright (c) 2001-2012 Art. Lebedev Studio (http://www.artlebedev.com) |
| Author: Alexandr Petrosian <paf@design.ru> (http://paf.design.ru) | |
| */ | |
| /* | |
| The prime numbers used from zend_hash.c, | |
| the part of Zend scripting engine library, | |
| Copyrighted (C) 1999-2000 Zend Technologies Ltd. | |
| http://www.zend.com/license/0_92.txt | |
| For more information about Zend please visit http://www.zend.com/ | |
| */ | */ |
| #ifndef PA_HASH_H | #ifndef PA_HASH_H |
| #define PA_HASH_H | #define PA_HASH_H |
| #include <stddef.h> | #define IDENT_PA_HASH_H "$Id$" |
| #include "pa_memory.h" | |
| #include "pa_types.h" | #include "pa_types.h" |
| #include "pa_string.h" | #include "pa_string.h" |
| class Pool; | const int HASH_ALLOCATES_COUNT=29; |
| class Hash { | /** Zend comment: Generated on an Octa-ALPHA 300MHz CPU & 2.5GB RAM monster |
| public: | |
| typedef String Key; | paf: HPUX ld could not handle static member: unsatisfied symbols |
| typedef void Value; | */ |
| static uint Hash_allocates[HASH_ALLOCATES_COUNT]={ | |
| 5, 11, 19, 53, 107, 223, 463, 983, 1979, 3907, 7963, | |
| 16229, 32531, 65407, 130987, 262237, 524521, 1048793, | |
| 2097397, 4194103, 8388857, 16777447, 33554201, 67108961, | |
| 134217487, 268435697, 536870683, 1073741621, 2147483399}; | |
| /// useful generic hash function | |
| inline void generic_hash_code(uint& result, char c) { | |
| result=(result<<4)+c; | |
| if(uint g=(result&0xF0000000)) { | |
| result=result^(g>>24); | |
| result=result^g; | |
| } | |
| } | |
| /// useful generic hash function | |
| inline void generic_hash_code(uint& result, const char* s) { | |
| while(char c=*s++) { | |
| result=(result<<4)+c; | |
| if(uint g=(result&0xF0000000)) { | |
| result=result^(g>>24); | |
| result=result^g; | |
| } | |
| } | |
| } | |
| /// useful generic hash function | |
| inline void generic_hash_code(uint& result, const char* buf, size_t size) { | |
| const char* end=buf+size; | |
| while(buf<end) { | |
| result=(result<<4)+*buf++; | |
| if(uint g=(result&0xF0000000)) { | |
| result=result^(g>>24); | |
| result=result^g; | |
| } | |
| } | |
| } | |
| /// simple hash code of int. used by EXIF mapping | |
| inline uint hash_code(int self) { | |
| uint result=0; | |
| generic_hash_code(result, (const char*)&self, sizeof(self)); | |
| return result; | |
| } | |
| #endif // PA_HASH_H | |
| #ifndef PA_HASH_CLASS | |
| #define PA_HASH_CLASS | |
| /** | |
| Simple hash. | |
| Automatically rehashed when almost is_full. | |
| Contains no 0 values. | |
| get returning 0 means there were no such. | |
| "put value 0" means "remove" | |
| */ | |
| #ifdef HASH_ORDER | |
| private: | #undef HASH |
| friend Pool; | #undef HASH_STRING |
| #undef HASH_NEW_PAIR | |
| #undef HASH_ORDER_CLEAR | |
| #undef HASH_FOR_EACH | |
| #define HASH OrderedHash | |
| #define HASH_STRING OrderedHashString | |
| #define HASH_NEW_PAIR(code, key, value) *ref=new Pair(code, key, value, *ref, this->last); this->last=&((*ref)->next) | |
| #define HASH_ORDER_CLEAR() first=0; last=&first | |
| #define HASH_FOR_EACH \ | |
| for(Pair *pair=this->first; pair; pair=pair->next) | |
| #else | |
| #define HASH Hash | |
| #define HASH_STRING HashString | |
| #define HASH_NEW_PAIR(code, key, value) *ref=new Pair(code, key, value, *ref) | |
| #define HASH_ORDER_CLEAR() | |
| #define HASH_FOR_EACH \ | |
| Pair **ref=this->refs; \ | |
| for(int index=0; index<this->allocated; index++) \ | |
| for(Pair *pair=*ref++; pair; pair=pair->link) | |
| // expand when used these %% of size | #endif |
| enum { | |
| THRESHOLD_PERCENT=75 | |
| }; | |
| // the pool I'm allocated on | template<typename K, typename V> class HASH: public PA_Object { |
| Pool *pool; | public: |
| // the index of [size] in [sizes] | typedef K key_type; |
| int size_index; | typedef V value_type; |
| class Pair; | |
| HASH() { | |
| allocated=Hash_allocates[allocates_index=0]; | |
| fpairs_count=fused_refs=0; | |
| refs=new Pair*[allocated]; | |
| HASH_ORDER_CLEAR(); | |
| } | |
| HASH(const HASH& source) { | |
| allocates_index=source.allocates_index; | |
| allocated=source.allocated; | |
| fused_refs=source.fused_refs; | |
| fpairs_count=source.fpairs_count; | |
| refs=new Pair*[allocated]; | |
| // clone & rehash | |
| #ifdef HASH_ORDER | |
| HASH_ORDER_CLEAR(); | |
| for(Pair *pair=source.first; pair; pair=pair->next) | |
| { | |
| uint index=pair->code%allocated; | |
| Pair **ref=&refs[index]; | |
| HASH_NEW_PAIR(pair->code, pair->key, pair->value); | |
| } | |
| #else | |
| for(int i=0; i<source.allocated; i++) | |
| for(Pair *pair=source.refs[i]; pair; pair=pair->link) | |
| { | |
| Pair **ref=&refs[i]; | |
| HASH_NEW_PAIR(pair->code, pair->key, pair->value); | |
| } | |
| #endif | |
| } | |
| #ifdef USE_DESTRUCTORS | |
| ~HASH() { | |
| Pair **ref=refs; | |
| for(int index=0; index<allocated; index++) | |
| for(Pair *pair=*ref++; pair;){ | |
| Pair *next=pair->link; | |
| delete pair; | |
| pair=next; | |
| } | |
| delete[] refs; | |
| } | |
| #endif | |
| // possible [sizes]. prime numbers | /// put a [value] under the [key] @returns existed or not |
| static uint sizes[]; | bool put(K key, V value) { |
| static int sizes_count; | if(!value) { |
| remove(key); | |
| return false; | |
| } | |
| if(is_full()) | |
| expand(); | |
| uint code=hash_code(key); | |
| uint index=code%allocated; | |
| Pair **ref=&refs[index]; | |
| for(Pair *pair=*ref; pair; pair=pair->link) | |
| if(pair->code==code && pair->key==key) { | |
| // found a pair with the same key | |
| pair->value=value; | |
| return true; | |
| } | |
| // proper pair not found -- create&link_in new pair | |
| if(!*ref) // root cell were fused_refs? | |
| fused_refs++; // not, we'll use it and record the fact | |
| HASH_NEW_PAIR(code, key, value); | |
| fpairs_count++; | |
| return false; | |
| } | |
| /// remove the [key] @returns existed or not | |
| bool remove(K key) { | |
| uint code=hash_code(key); | |
| uint index=code%allocated; | |
| for(Pair **ref=&refs[index]; *ref; ref=&(*ref)->link){ | |
| Pair *pair=*ref; | |
| if(pair->code==code && pair->key==key) { | |
| // found a pair with the same key | |
| Pair *next=pair->link; | |
| #ifdef HASH_ORDER | |
| *(pair->prev)=pair->next; | |
| if(pair->next) | |
| pair->next->prev=pair->prev; | |
| else | |
| last=pair->prev; | |
| #endif | |
| delete pair; | |
| *ref=next; | |
| --fpairs_count; | |
| return true; | |
| } | |
| } | |
| return false; | |
| } | |
| /// return true if key exists | |
| bool contains(K key){ | |
| uint code=hash_code(key); | |
| uint index=code%allocated; | |
| for(Pair *pair=refs[index]; pair; pair=pair->link){ | |
| if(pair->code==code && pair->key==key) | |
| return true; | |
| } | |
| return false; | |
| } | |
| /// get associated [value] by the [key] | |
| V get(K key) const { | |
| uint code=hash_code(key); | |
| uint index=code%allocated; | |
| for(Pair *pair=refs[index]; pair; pair=pair->link) | |
| if(pair->code==code && pair->key==key) | |
| return pair->value; | |
| return V(0); | |
| } | |
| // number of allocated pairs | #ifdef HASH_ORDER |
| int size; | String::Body first_key() const { |
| return (first) ? String::Body(first->key, first->code) : String::Body(); | |
| } | |
| V first_value() const { | |
| return (first) ? first->value : V(0); | |
| } | |
| String::Body last_key() const { | |
| if (fpairs_count) { | |
| Pair* pair = (Pair*)((char *)last - offsetof(Pair, next)); | |
| return String::Body(pair->key, pair->code); | |
| } else { | |
| return String::Body(); | |
| } | |
| } | |
| V last_value() const { | |
| return (fpairs_count) ? ((Pair *)((char *)last - offsetof(Pair, next)))->value : V(0); | |
| } | |
| void order_clear() { | |
| HASH_ORDER_CLEAR(); | |
| } | |
| void order_next(Pair* pair) { | |
| pair->prev=last; | |
| pair->next=0; | |
| *last=pair; | |
| last=&(pair->next); | |
| } | |
| // helper: expanding when used == threshold | #endif |
| int threshold; | |
| // used pairs | /// put a [value] under the [key] if that [key] existed @returns existed or not |
| int used; | bool put_replaced(K key, V value) { |
| if(!value) { | |
| remove(key); | |
| return false; | |
| } | |
| uint code=hash_code(key); | |
| uint index=code%allocated; | |
| for(Pair *pair=refs[index]; pair; pair=pair->link) | |
| if(pair->code==code && pair->key==key) { | |
| // found a pair with the same key, replacing | |
| pair->value=value; | |
| return true; | |
| } | |
| // proper pair not found | |
| return false; | |
| } | |
| /// put a [value] under the [key] if that [key] NOT existed @returns existed or not | |
| bool put_dont_replace(K key, V value) { | |
| if(!value) { | |
| remove(key); | |
| return false; | |
| } | |
| if(is_full()) | |
| expand(); | |
| uint code=hash_code(key); | |
| uint index=code%allocated; | |
| Pair **ref=&refs[index]; | |
| for(Pair *pair=*ref; pair; pair=pair->link) | |
| if(pair->code==code && pair->key==key) { | |
| // found a pair with the same key, NOT replacing | |
| return true; | |
| } | |
| // proper pair not found -- create&link_in new pair | |
| if(!*ref) // root cell were fused_refs? | |
| fused_refs++; // not, we'll use it and record the fact | |
| HASH_NEW_PAIR(code, key, value); | |
| fpairs_count++; | |
| return false; | |
| } | |
| /// put all 'src' values if NO with same key existed | |
| void merge_dont_replace(const HASH& src) { | |
| #ifdef HASH_ORDER | |
| for(Pair *pair=src.first; pair; pair=pair->next) | |
| #else | |
| for(int i=0; i<src.allocated; i++) | |
| for(Pair *pair=src.refs[i]; pair; pair=pair->link) | |
| #endif | |
| put_dont_replace(pair->key, pair->value); | |
| } | |
| // main storage | /// number of elements in hash |
| class Pair { | int count() const { return fpairs_count; } |
| friend Hash; | |
| /// iterate over all pairs | |
| template<typename I> void for_each(void callback(K, V, I), I info) const { | |
| HASH_FOR_EACH | |
| callback(pair->key, pair->value, info); | |
| } | |
| /// iterate over all pairs | |
| template<typename I> void for_each_ref(void callback(K, V&, I), I info) const { | |
| HASH_FOR_EACH | |
| callback(pair->key, pair->value, info); | |
| } | |
| /// iterate over all pairs until condition becomes true, return that element | |
| template<typename I> V first_that(bool callback(K, V, I), I info) const { | |
| HASH_FOR_EACH | |
| if(callback(pair->key, pair->value, info)) | |
| return pair->value; | |
| return V(0); | |
| } | |
| /// remove all elements | |
| void clear() { | |
| memset(refs, 0, sizeof(*refs)*allocated); | |
| fpairs_count=fused_refs=0; | |
| HASH_ORDER_CLEAR(); | |
| } | |
| protected: | |
| /// the index of [allocated] in [Hash_allocates] | |
| int allocates_index; | |
| /// number of allocated pairs | |
| int allocated; | |
| /// used pairs | |
| int fused_refs; | |
| /// stored pairs total (including those by links) | |
| int fpairs_count; | |
| /// pair storage | |
| class Pair: public PA_Allocated { | |
| public: | |
| uint code; | uint code; |
| Key key; | K key; |
| Value *value; | V value; |
| Pair *link; | Pair *link; |
| #ifdef HASH_ORDER | |
| void *operator new(size_t size, Pool *apool); | Pair **prev; |
| Pair *next; | |
| Pair(uint acode, Key& akey, Value *avalue, Pair *alink) : | |
| code(acode), | Pair(uint acode, K akey, V avalue, Pair *alink, Pair **aprev) : code(acode), key(akey), value(avalue), link(alink), |
| key(akey), | prev(aprev), next(0) { *aprev=this; } |
| value(avalue), | #else |
| link(alink) {} | Pair(uint acode, K akey, V avalue, Pair *alink) : code(acode), key(akey), value(avalue), link(alink) {} |
| #endif | |
| } **refs; | } **refs; |
| // new&constructors made private to enforce factory manufacturing at pool | #ifdef HASH_ORDER |
| void *operator new(size_t size, Pool *apool); | Pair *first; |
| Pair **last; | |
| #endif | |
| /// filled to threshold (THRESHOLD_PERCENT=75), needs expanding | |
| bool is_full() { return fused_refs + allocated/4 >= allocated; } | |
| Hash(Pool *apool); | /// allocate larger buffer & rehash |
| void expand() { | |
| int old_allocated=allocated; | |
| Pair **old_refs=refs; | |
| if (allocates_index<HASH_ALLOCATES_COUNT-1) allocates_index++; | |
| // allocated bigger refs array | |
| allocated=Hash_allocates[allocates_index]; | |
| refs=new Pair*[allocated]; | |
| // rehash | |
| Pair **old_ref=old_refs; | |
| for(int old_index=0; old_index<old_allocated; old_index++) | |
| for(Pair *pair=*old_ref++; pair; ) { | |
| Pair *next=pair->link; | |
| uint new_index=pair->code%allocated; | |
| Pair **new_ref=&refs[new_index]; | |
| pair->link=*new_ref; | |
| *new_ref=pair; | |
| // filled to threshold: needs expanding | pair=next; |
| bool full() { return used==threshold; } | } |
| // allocate larger buffer & rehash | delete[] old_refs; |
| void expand(); | } |
| private: //disabled | |
| HASH& operator = (const HASH&) { return *this; } | |
| }; | |
| /** | |
| Simple String::body hash. | |
| Allows hash code caching | |
| */ | |
| #ifdef HASH_CODE_CACHING | |
| template<typename V> class HASH_STRING: public HASH<const CORD,V> { | |
| public: | public: |
| // useful generic hash function | typedef typename HASH<const CORD,V>::Pair Pair; |
| static uint generic_code(uint aresult, char *start, uint size); | typedef const String::Body &K; |
| // put a [value] under the [key] | typedef K key_type; |
| void put(Key& key, Value *value); | |
| /// put a [value] under the [key] @returns existed or not | |
| bool put(K str, V value) { | |
| if(!value) { | |
| remove(str); | |
| return false; | |
| } | |
| if(this->is_full()) | |
| this->expand(); | |
| CORD key=str.get_cord(); | |
| uint code=str.get_hash_code(); | |
| uint index=code%this->allocated; | |
| Pair **ref=&this->refs[index]; | |
| for(Pair *pair=*ref; pair; pair=pair->link) | |
| if(pair->code==code && CORD_cmp(pair->key,key)==0) { | |
| // found a pair with the same key | |
| pair->value=value; | |
| return true; | |
| } | |
| // proper pair not found -- create&link_in new pair | |
| if(!*ref) // root cell were fused_refs? | |
| this->fused_refs++; // not, we'll use it and record the fact | |
| HASH_NEW_PAIR(code, key, value); | |
| this->fpairs_count++; | |
| return false; | |
| } | |
| /// remove the [key] @returns existed or not | |
| bool remove(K str) { | |
| CORD key=str.get_cord(); | |
| uint code=str.get_hash_code(); | |
| uint index=code%this->allocated; | |
| for(Pair **ref=&this->refs[index]; *ref; ref=&(*ref)->link){ | |
| Pair *pair=*ref; | |
| if(pair->code==code && CORD_cmp(pair->key,key)==0) { | |
| // found a pair with the same key | |
| Pair *next=pair->link; | |
| #ifdef HASH_ORDER | |
| *(pair->prev)=pair->next; | |
| if(pair->next) | |
| pair->next->prev=pair->prev; | |
| else | |
| this->last=pair->prev; | |
| #endif | |
| delete pair; | |
| *ref=next; | |
| --this->fpairs_count; | |
| return true; | |
| } | |
| } | |
| return false; | |
| } | |
| /// return true if key exists | |
| bool contains(K str){ | |
| CORD key=str.get_cord(); | |
| uint code=str.get_hash_code(); | |
| uint index=code%this->allocated; | |
| for(Pair *pair=this->refs[index]; pair; pair=pair->link){ | |
| if(pair->code==code && CORD_cmp(pair->key,key)==0) | |
| return true; | |
| } | |
| return false; | |
| } | |
| /// get associated [value] by the [key] | |
| V get(K str) const { | |
| CORD key=str.get_cord(); | |
| uint code=str.get_hash_code(); | |
| uint index=code%this->allocated; | |
| for(Pair *pair=this->refs[index]; pair; pair=pair->link) | |
| if(pair->code==code && CORD_cmp(pair->key,key)==0) | |
| return pair->value; | |
| return V(0); | |
| } | |
| /// put a [value] under the [key] if that [key] existed @returns existed or not | |
| bool put_replaced(K str, V value) { | |
| if(!value) { | |
| remove(str); | |
| return false; | |
| } | |
| CORD key=str.get_cord(); | |
| uint code=str.get_hash_code(); | |
| uint index=code%this->allocated; | |
| for(Pair *pair=this->refs[index]; pair; pair=pair->link) | |
| if(pair->code==code && CORD_cmp(pair->key,key)==0) { | |
| // found a pair with the same key, replacing | |
| pair->value=value; | |
| return true; | |
| } | |
| // proper pair not found | |
| return false; | |
| } | |
| /// put a [value] under the [key] if that [key] NOT existed @returns existed or not | |
| bool put_dont_replace(K str, V value) { | |
| if(!value) { | |
| remove(str); | |
| return false; | |
| } | |
| if(this->is_full()) | |
| this->expand(); | |
| CORD key=str.get_cord(); | |
| uint code=str.get_hash_code(); | |
| uint index=code%this->allocated; | |
| Pair **ref=&this->refs[index]; | |
| for(Pair *pair=*ref; pair; pair=pair->link) | |
| if(pair->code==code && CORD_cmp(pair->key,key)==0) { | |
| // found a pair with the same key, NOT replacing | |
| return true; | |
| } | |
| // proper pair not found -- create&link_in new pair | |
| if(!*ref) // root cell were fused_refs? | |
| this->fused_refs++; // not, we'll use it and record the fact | |
| HASH_NEW_PAIR(code, key, value); | |
| this->fpairs_count++; | |
| return false; | |
| } | |
| /// put all 'src' values if NO with same key existed | |
| void merge_dont_replace(const HASH_STRING& src) { | |
| #ifdef HASH_ORDER | |
| for(Pair *pair=src.first; pair; pair=pair->next) | |
| #else | |
| for(int i=0; i<src.allocated; i++) | |
| for(Pair *pair=src.refs[i]; pair; pair=pair->link) | |
| #endif | |
| put_dont_replace(String::Body(pair->key, pair->code), pair->value); | |
| } | |
| // get associated [value] by the [key] | /// iterate over all pairs |
| Value* get(Key& key); | template<typename I> void for_each(void callback(K, V, I), I info) const { |
| HASH_FOR_EACH | |
| callback(String::Body(pair->key, pair->code), pair->value, info); | |
| } | |
| /// iterate over all pairs | |
| template<typename I> void for_each_ref(void callback(K, V&, I), I info) const { | |
| HASH_FOR_EACH | |
| callback(String::Body(pair->key, pair->code), pair->value, info); | |
| } | |
| /// iterate over all pairs until condition becomes true, return that element | |
| template<typename I> V first_that(bool callback(K, V, I), I info) const { | |
| HASH_FOR_EACH | |
| if(callback(String::Body(pair->key, pair->code), pair->value, info)) | |
| return pair->value; | |
| return V(0); | |
| } | |
| /// simple hash iterator | |
| class Iterator { | |
| const HASH_STRING<V>& fhash; | |
| Pair *fcurrent; | |
| int i; | |
| public: | |
| Iterator(const HASH_STRING<V>& ahash): fhash(ahash) { | |
| #ifdef HASH_ORDER | |
| fcurrent=fhash.first; | |
| #else | |
| fcurrent=0; | |
| for(i=0; i<fhash.allocated; i++) | |
| if (fcurrent=fhash.refs[i]) | |
| break; | |
| #endif | |
| } | |
| private: //disabled | operator bool () { |
| return fcurrent != 0; | |
| } | |
| void next() { | |
| #ifdef HASH_ORDER | |
| fcurrent=fcurrent->next; | |
| #else | |
| if(fcurrent=fcurrent->link) | |
| return; | |
| for(i++; i<fhash.allocated; i++) | |
| if (fcurrent=fhash.refs[i]) | |
| break; | |
| #endif | |
| } | |
| Hash& operator = (Hash& src) { return *this; } | String::Body key(){ |
| Hash(Hash& src) {} | return String::Body(fcurrent->key, fcurrent->code); |
| } | |
| V value(){ | |
| return fcurrent->value; | |
| } | |
| Pair *pair(){ | |
| return fcurrent; | |
| } | |
| }; | |
| }; | }; |
| #else //HASH_CODE_CACHING | |
| template<typename V> class HASH_STRING: public HASH<const String::Body,V>{}; | |
| #endif //HASH_CODE_CACHING | |
| #ifndef HASH_ORDER | |
| /// Auto-object used to temporarily substituting/removing string hash values | |
| template <typename H, typename V> | |
| class Temp_hash_value { | |
| H *fhash; | |
| String::Body fname; | |
| V saved_value; | |
| public: | |
| Temp_hash_value(H *ahash, String::Body aname, V avalue) : fhash(ahash), fname(aname) { | |
| if(fhash){ | |
| saved_value=fhash->get(aname); | |
| fhash->put(aname, avalue); | |
| } | |
| } | |
| ~Temp_hash_value() { | |
| if(fhash) | |
| fhash->put(fname, saved_value); | |
| } | |
| }; | |
| #endif | #endif |
| #endif //PA_HASH_CLASS |