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| version 1.55, 2002/08/01 11:41:14 | version 1.57.2.27.2.14, 2003/04/02 11:35:20 |
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| Line 1 | Line 1 |
| /** @file | /** @file |
| Parser: Array & Array_iter classes decls. | Parser: Array & Array_iterator classes decls. |
| Copyright (c) 2001, 2002 ArtLebedev Group (http://www.artlebedev.com) | Copyright (c) 2001-2003 ArtLebedev Group (http://www.artlebedev.com) |
| Author: Alexandr Petrosian <paf@design.ru> (http://paf.design.ru) | Author: Alexandr Petrosian <paf@design.ru> (http://paf.design.ru) |
| */ | */ |
| #ifndef PA_ARRAY_H | #ifndef PA_ARRAY_H |
| #define PA_ARRAY_H | #define PA_ARRAY_H |
| static const char* IDENT_ARRAY_Y="$Date$"; | static const char* IDENT_ARRAY_H="$Date$"; |
| #include "pa_pool.h" | // includes |
| #include "pa_types.h" | |
| #include "pa_string.h" | |
| class Array_iter; | |
| /** | |
| Pooled Array. | |
| Internal structure: | |
| @verbatim | |
| Array Chunk0 | |
| ====== ======== | |
| head--------------->[ptr] | |
| append_here-------->[ptr] | |
| link_row ........ | |
| . . | |
| . [ptr] | |
| ...........>[link to the next chunk] | |
| @endverbatim | |
| */ | |
| class Array : public Pooled { | #include "pa_memory.h" |
| friend class Array_iter; | #include "pa_exception.h" |
| public: | |
| // externals | |
| // forwards | |
| template<typename T> class Array_iterator; | |
| /// Simple Array | |
| template<typename T> class Array: public PA_Object { | |
| /// Array item type | friend class Array_iterator<T>; |
| typedef void Item; | |
| /*/// for_each iterator function type, const info | protected: |
| typedef void (*For_each_func_const)(Item *value, const void *info); | |
| */ | /// elements[growing size] here |
| T *felements; | |
| /// for_each iterator function type | |
| typedef void (*For_each_func)(Item *value, void *info); | // allocated size |
| /* | size_t fallocated; |
| /// for_each iterator function type, passing item storage address | |
| typedef void (*For_each_func_storage)(Item ** value, void *info); | // array size |
| */ | size_t fused; |
| /// first_that iterator function type, const info | |
| typedef void *(*Item_that_func_const)(Item *value, const void *info); | |
| /// first_that iterator function type | |
| typedef void *(*Item_that_func)(Item *value, void *info); | |
| enum { | |
| CR_INITIAL_ROWS_DEFAULT=3, ///< default preallocated row count | |
| CR_GROW_COUNT=3 ///< each time the Array chunk_is_full() array expanded() | |
| }; | |
| public: | public: |
| typedef T element_type; | |
| Array(Pool& apool, int initial_rows=CR_INITIAL_ROWS_DEFAULT); | Array(int initial=3): |
| Array(const Array& source, int offset=0); | fallocated(initial>3?initial:3), |
| fused(0) | |
| { | |
| felements=static_cast<T*>(malloc(fallocated*sizeof(T))); | |
| } | |
| /// size Array. how many items are in it | /// how many items are in Array |
| int size() const { return fused_rows; } | size_t count() const { return fused; } |
| /// append Item to array | /// append to array |
| Array& operator += (Item *src); | Array& operator += (T src) { |
| /// append int value to array | if(is_full()) |
| Array& operator += (int value) { return *this+=reinterpret_cast<Item *>(value); } | expand(2); |
| /// dirty hack to allow constant items storage. I long for Array<const Item*> | felements[fused++]=src; |
| Array& operator += (const Item *src) { return *this+=const_cast<Item *>(src); } | |
| return *this; | |
| } | |
| /// append other Array portion to this one. starting from offset | /// append other Array portion to this one. starting from offset |
| Array& append_array(const Array& src, int offset=0); | Array& append(const Array& src, int offset=0, int limit=0) { |
| if(offset<0) { | |
| throw Exception(0, | |
| 0, | |
| "Array::append(offset=%d) out <0", offset); | |
| //return Nothing; // never | |
| } | |
| // fix limit | |
| { | |
| int m=src.count()-offset; | |
| if(!m || limit<0) | |
| return *this; | |
| if(!limit || limit>m) | |
| limit=m; | |
| } | |
| Item *get(int index) const; | ssize_t delta=limit-(fallocated-fused); |
| int get_int(int index) const { return reinterpret_cast<int>(get(index)); } | if(delta>0) |
| expand(delta); | |
| void put(int index, Item *item); | T* from=&src.felements[offset]; |
| void put_int(int index, int value) { put(index, reinterpret_cast<Item *>(value)); } | T* to=&felements[fused]; |
| /// convinient way to get strings from Array. I long for Array<const String *> | T* from_end=from+limit; |
| const String *get_string(int index) const { | while(from<from_end) |
| return const_cast<const String *>(static_cast<String *>(get(index))); | *to++=*from++; |
| fused+=limit; | |
| return *this; | |
| } | } |
| /*/// iterate over all elements, const info | /// get index-element |
| void for_each(For_each_func_const func, const void *info=0) const; | T get(size_t index) const { |
| */ | assert(index>=0 && index<count()); |
| return felements[index]; | |
| } | |
| /// iterate over all elements | /// ref version of get |
| void for_each(For_each_func func, void *info=0) const; | T& get_ref(size_t index) const { |
| assert(index>=0 && index<count()); | |
| return felements[index]; | |
| } | |
| /*/// iterate over all elements, passing address of item storage | /// put index-element |
| void for_each(For_each_func_storage func, void *info=0); | void put(size_t index, T element) { |
| */ | assert(index>=0 && index<count()); |
| felements[index]=element; | |
| /// iterate over all elements until condition, const info | } |
| void* first_that(Item_that_func_const func, const void *info=0) const; | |
| /// iterate over all elements until condition | |
| void* first_that(Item_that_func func, void *info=0) const; | |
| private: | |
| /// constructor helper | |
| void construct_new(int initial_rows); | |
| private: | |
| /// several record elements | |
| struct Chunk { | |
| int count; ///< the number of rows in chunk | |
| /// item or a link to next chunk union | |
| union Row { | |
| Item *item; | |
| Chunk *link; ///< link to the next chunk in chain | |
| } rows[1]; | |
| // next rows are here | |
| } | |
| *head; ///< the head chunk of the chunk chain | |
| /** last allocated chunk | |
| helps appending Arrays | |
| */ | |
| Chunk *tail; | |
| /// next append would write to this record | |
| Chunk::Row *append_here; | |
| /** the address of place where lies address | |
| of the link to the next chunk to allocate | |
| */ | |
| Chunk::Row *link_row; | |
| private: | T operator [](size_t index) const { return get(index); } |
| // array size | /// iterate over all elements |
| int fused_rows; | template<typename I> void for_each(void (*callback)(T, I), I info) const { |
| T *last=felements+fused; | |
| for(T *current=felements; current<last; current++) | |
| callback(*current, info); | |
| } | |
| /// iterate over all elements until condition becomes true, return that element | |
| template<typename I> T first_that(bool (*callback)(T, I), I info) const { | |
| T *last=felements+fused; | |
| for(T *current=felements; current<last; current++) | |
| if(callback(*current, info)) | |
| return *current; | |
| private: | return T(0); |
| } | |
| bool chunk_is_full() { | protected: |
| return append_here == link_row; | |
| bool is_full() { | |
| return fused == fallocated; | |
| } | |
| void expand(size_t delta) { | |
| size_t new_allocated=fallocated+delta; | |
| felements = (T *)realloc(felements, new_allocated*sizeof(T)); | |
| memset(&felements[fallocated], 0, delta*sizeof(T)); | |
| fallocated=new_allocated; | |
| } | } |
| void expand(int chunk_rows); | |
| private: //disabled | private: //disabled |
| //Array(Array&) { } | Array(const Array&) {} |
| Array& operator = (const Array&) { return *this; } | Array& operator = (const Array&) { return *this; } |
| }; | }; |
| /// handy array iterator | /** Array iterator, usage: |
| class Array_iter { | @code |
| // Array<T> a; | |
| for(Array_iterator<T> i(a); i.has_next(); ) { | |
| T& element=i.next(); | |
| ... | |
| } | |
| @endcode | |
| */ | |
| template<typename T> class Array_iterator { | |
| const Array<T>& farray; | |
| T *fcurrent; | |
| T *flast; | |
| public: | public: |
| Array_iter(const Array& aarray) : array(aarray), | Array_iterator(const Array<T>& aarray): farray(aarray) { |
| chunk(aarray.head), | fcurrent=farray.felements; |
| row(chunk->rows), | flast=farray.felements+farray.count(); |
| countdown(chunk->count) { | |
| } | } |
| /// there are still elements | /// there are still elements |
| bool has_next() { | bool has_next() { |
| return !(chunk==array.tail && row==array.append_here); | return fcurrent<flast; |
| } | } |
| /// quickly extracts next Array::Item | /// quickly extracts next Array element |
| Array::Item *next() { | const T next() { |
| // assuming: never called after has_next()! | return *(fcurrent++); |
| if(countdown==0) { // end of chunk? | } |
| chunk=row->link; | |
| row=chunk->rows; | }; |
| countdown=chunk->count; | /* |
| } | /** Nonconst array iterator, usage: |
| Array::Item *result=row->item; | @code |
| row++; countdown--; | // Array<T> a; |
| return result; | for(Array_iterator<T> i(a); i.has_next(); ) { |
| T& element=i.next(); | |
| ... | |
| } | |
| @endcode | |
| * / | |
| template<typename T> class Array_modifing_iterator { | |
| Array<T>& farray; | |
| T *fcurrent; | |
| T *flast; | |
| public: | |
| Array_modifing_iterator(Array<T>& aarray): farray(aarray) { | |
| fcurrent=farray.felements; | |
| flast=farray.felements+farray.count(); | |
| } | } |
| /// quickly extracts next Array::Item as const String | /// there are still elements |
| const String *next_string() { | bool has_next() { |
| return const_cast<const String *>(static_cast<String *>(next())); | return fcurrent<flast; |
| } | } |
| private: | /// quickly extracts next Array element |
| const Array& array; | T& next() { |
| const Array::Chunk *chunk; | return *(fcurrent++); |
| const Array::Chunk::Row *row; | } |
| int countdown; | |
| }; | }; |
| */ | |
| #endif | #endif |