--- parser3/src/include/pa_hash.h	2001/01/27 12:04:53	1.2
+++ parser3/src/include/pa_hash.h	2010/08/11 16:17:27	1.83
@@ -1,88 +1,644 @@
-/*
-  $Id: pa_hash.h,v 1.2 2001/01/27 12:04:53 paf Exp $
-*/
+/** @file
+	Parser: hash class decl.
 
-/*
+	Copyright (c) 2001-2009 ArtLebedev Group (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
 #define PA_HASH_H
 
-#include <stddef.h>
+static const char * const IDENT_HASH_H="$Date: 2010/08/11 16:17:27 $";
 
+#include "pa_memory.h"
 #include "pa_types.h"
 #include "pa_string.h"
 
-class Pool;
+const int HASH_ALLOCATES_COUNT=29;
+
+/** Zend comment: Generated on an Octa-ALPHA 300MHz CPU & 2.5GB RAM monster 
+
+	paf: HPUX ld could not handle static member: unsatisfied symbols
+*/
+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
 
-typedef String Key;
-typedef void Value;
+#undef HASH
+#undef HASH_STRING
+#undef HASH_NEW_PAIR
+#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_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_FOR_EACH \
+	Pair **ref=this->refs; \
+	for(int index=0; index<this->allocated; index++) \
+		for(Pair *pair=*ref++; pair; pair=pair->link)
 
-class Hash {
+#endif
+
+template<typename K, typename V> class HASH: public PA_Object {
 public:
 
-private:
-	friend Pool;
+	typedef K key_type;
+	typedef V value_type;
 
-	// expand when there would be used this %% of size
-	enum {
-		THRESHOLD_PERCENT=75
-	};
+	HASH() { 
+		allocated=Hash_allocates[allocates_index=0];
+		fpairs_count=fused_refs=0;
+		refs=new(UseGC) Pair*[allocated];
+#ifdef HASH_ORDER
+		first=0;
+		last=&first;
+#endif
+	}
 
-	// the pool I'm allocated on
-	Pool *pool;
+	HASH(const HASH& source) {
+		allocates_index=source.allocates_index;
+		allocated=source.allocated;
+		fused_refs=source.fused_refs;
+		fpairs_count=source.fpairs_count;
+		refs=new(UseGC) Pair*[allocated];
+		// clone & rehash
+#ifdef HASH_ORDER
+		first=0;
+		last=&first;
+		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
+	}
 
-	// the index of size in sizes
-	int size_index;
+#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
-	static uint sizes[];
-	static int sizes_count;
+	/// put a [value] under the [key] @returns existed or not
+	bool put(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
+				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;
+	}
 
-	// number of allocated pairs
-	int size;
+	/// 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;
+			}
+		}
 
-	// helper: expanding when used == threshold
-	int threshold;
+		return false;
+	}
 
-	// used pairs
-	int used;
+	/// 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;
+		}
 
-	// main storage
-	class Pair {
-		friend Hash;
+		return false;
+	}
 
-		uint code;
-		Key key;
-		Value *value;
-		Pair *link;
+	/// 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;
 		
-		void *operator new(size_t size, Pool *apool);
+		return V(0);
+	}
+
+#ifdef HASH_ORDER
+	V first_value() const {
+		return (first) ? first->value : V(0);
+	}
+
+	V last_value() const {
+		return (fpairs_count) ? ((Pair *)((char *)last - offsetof(Pair, next)))->value : V(0);
+	}
+#endif
+
+	/// put a [value] under the [key] if that [key] existed @returns existed or not
+	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);
+	}
+
+	/// number of elements in hash
+	int count() const { return fpairs_count; }
+
+	/// 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;	
+#ifdef HASH_ORDER
+		first=0;
+		last=&first;
+#endif
+	}
+
+protected:
+
+	/// the index of [allocated] in [Hash_allocates]
+	int allocates_index;
+
+	/// number of allocated pairs
+	int allocated;
 
-		Pair(uint acode, Key& akey, Value *avalue, Pair *alink) :
-			code(acode),
-			key(akey),
-			value(avalue),
-			link(alink) {}
+	/// 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;
+		K key;
+		V value;
+		Pair *link;
+#ifdef HASH_ORDER
+		Pair **prev;
+		Pair *next;
+
+		Pair(uint acode, K akey, V avalue, Pair *alink, Pair **aprev) : code(acode), key(akey), value(avalue), link(alink), 
+			prev(aprev), next(0) { *aprev=this; }
+#else
+		Pair(uint acode, K akey, V avalue, Pair *alink) : code(acode), key(akey), value(avalue), link(alink) {}
+#endif
 	} **refs;
 
-	// new&constructors made private to enforce factory manufacturing at pool
-	void *operator new(size_t size, Pool *apool);
+#ifdef HASH_ORDER
+	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(UseGC) 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;
 
-	bool full() {
-		return used==threshold;
+				pair=next;
+			}
+
+		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:
 
-	static uint generic_code(uint aresult, char *start, uint size);
-	void put(Key& key, Value *value);
-	Value* get(Key& key);
+	typedef typename HASH<const CORD,V>::Pair Pair; 
+	typedef const String::Body &K;
+
+	typedef K key_type;
+	
+	/// 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);
+	}
+
+	/// iterate over all pairs
+	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;
+	public:
+		Iterator(const HASH_STRING<V>& ahash): fhash(ahash) {
+			fcurrent=fhash.first;
+		}
+
+		operator bool () {
+			return fcurrent != 0;
+		}
+
+		void next() {
+			fcurrent=fcurrent->next;
+		}
+
+		String::Body key(){
+			return String::Body(fcurrent->key, fcurrent->code);
+		}
+
+		V value(){
+			return fcurrent->value;
+		}
+	};
 };
+#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 K, typename V>
+class Temp_hash_value {
+	HashString<V> &fhash;
+	K fname;
+	V saved_value;
+public:
+	Temp_hash_value(HashString<V>& ahash, K aname, V avalue) :
+		fhash(ahash),
+		fname(aname),
+		saved_value(ahash.get(aname)) {
+		fhash.put(aname, avalue);
+	}
+	~Temp_hash_value() { 
+		fhash.put(fname, saved_value);
+	}
+};
 #endif
+
+#endif //PA_HASH_CLASS