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1.24 paf 1: /** @file
1.59 paf 2: Parser: Array & Array_iterator classes decls.
1.26 paf 3:
1.71 misha 4: Copyright (c) 2001-2009 ArtLebedev Group (http://www.artlebedev.com)
1.53 paf 5: Author: Alexandr Petrosian <paf@design.ru> (http://paf.design.ru)
1.1 paf 6: */
7:
1.24 paf 8: #ifndef PA_ARRAY_H
9: #define PA_ARRAY_H
1.54 paf 10:
1.78 ! misha 11: static const char * const IDENT_ARRAY_Y="$Date: 2009-04-30 04:39:06 $";
1.24 paf 12:
1.59 paf 13: // includes
14:
15: #include "pa_memory.h"
16: #include "pa_exception.h"
17:
18: // forwards
19:
20: template<typename T> class Array_iterator;
21:
22: // defines
23:
24: #define ARRAY_OPTION_LIMIT_ALL ((size_t)-1)
25:
26: /// Simple Array
27: template<typename T> class Array: public PA_Object {
28:
29: friend class Array_iterator<T>;
30:
31: protected:
32:
33: /// elements[growing size] here
34: T *felements;
35:
36: // allocated size
37: size_t fallocated;
38:
39: // array size
40: size_t fused;
1.1 paf 41:
42: public:
1.59 paf 43: struct Action_options {
44: size_t offset;
45: size_t limit; //< ARRAY_OPTION_LIMIT_ALL means 'all'. zero limit means 'nothing'
46: bool reverse;
47: bool defined;
48:
49: Action_options(
50: size_t aoffset=0,
51: size_t alimit=ARRAY_OPTION_LIMIT_ALL,
52: bool areverse=false):
53: offset(aoffset), limit(alimit), reverse(areverse),
54: defined(false) {}
55:
56: bool adjust(size_t count) {
57: if(!count || !limit)
58: return false;
1.70 misha 59: if(offset>=count)
1.59 paf 60: return false;
61: // max(limit)
62: size_t m=reverse?
1.69 misha 63: offset+1
1.59 paf 64: :count-offset;
65: if(!m)
66: return false;
67: // fix limit
68: if(limit==ARRAY_OPTION_LIMIT_ALL || limit>m)
69: limit=m;
1.7 paf 70:
1.59 paf 71: return true;
72: }
1.29 paf 73:
1.59 paf 74:
1.1 paf 75: };
76:
1.59 paf 77: typedef T element_type;
78:
1.71 misha 79: inline Array(size_t initial=0):
80: fallocated(initial),
1.59 paf 81: fused(0)
82: {
1.77 misha 83: felements=fallocated?(T *)pa_malloc(fallocated*sizeof(T)):0;
1.59 paf 84: }
1.6 paf 85:
1.74 misha 86: #ifdef USE_DESTRUCTORS
1.73 misha 87: inline ~Array(){
1.75 misha 88: if(felements)
1.77 misha 89: pa_free(felements);
1.72 misha 90: }
1.74 misha 91: #endif
1.72 misha 92:
1.59 paf 93: /// how many items are in Array
1.71 misha 94: inline size_t count() const { return fused; }
1.59 paf 95: /// append to array
1.71 misha 96: inline Array& operator+=(T src) {
1.59 paf 97: if(is_full())
1.71 misha 98: expand(fallocated>0?2:3); // 3 is PAF default, confirmed by tests
1.7 paf 99:
1.59 paf 100: felements[fused++]=src;
1.24 paf 101:
1.59 paf 102: return *this;
103: }
1.24 paf 104:
105: /// append other Array portion to this one. starting from offset
1.59 paf 106: Array& append(const Array& src,
107: size_t offset=0,
108: size_t limit=ARRAY_OPTION_LIMIT_ALL, //< negative limit means 'all'. zero limit means 'nothing'
109: bool reverse=false) {
110:
111: size_t src_count=src.count();
112: // skip tivials
113: if(!src_count || !limit || offset>=src_count)
114: return *this;
115: // max(limit)
116: size_t m=reverse?
117: 1+offset
118: :src_count-offset;
119: if(!m)
120: return *this;
121: // fix limit
122: if(limit==ARRAY_OPTION_LIMIT_ALL || limit>m)
123: limit=m;
124:
125: ssize_t delta=reverse?
126: (ssize_t)limit
127: :limit-(fallocated-fused);
128: if(delta>0)
129: expand(delta);
130:
131: T* from=&src.felements[offset];
132: T* to=&felements[fused];
133: if(reverse) { // reverse
134: for(T* from_end=from-limit; from>from_end; --from)
135: *to++=*from;
136:
137: } else { // forward
138: for(T* from_end=from+limit; from<from_end; from++)
139: *to++=*from;
140: }
141:
142: fused+=limit;
143: return *this;
144: }
145:
146: /// get index-element
1.71 misha 147: inline T get(size_t index) const {
1.63 paf 148: assert(index<count());
1.59 paf 149: return felements[index];
150: }
151:
152: /// ref version of get
1.71 misha 153: inline T& get_ref(size_t index) const {
1.63 paf 154: assert(index<count());
1.59 paf 155: return felements[index];
156: }
157:
158: /// put index-element
1.71 misha 159: inline void put(size_t index, T element) {
1.63 paf 160: assert(index<count());
1.59 paf 161: felements[index]=element;
162: }
163:
1.71 misha 164: inline T operator [](size_t index) const { return get(index); }
1.29 paf 165:
166: /// iterate over all elements
1.59 paf 167: template<typename I> void for_each(void (*callback)(T, I), I info) const {
1.60 paf 168: T *last=felements+fused;
169: for(T *current=felements; current<last; current++)
170: callback(*current, info);
171: }
172:
173: /// iterate over all elements
1.68 paf 174: template<typename I> void for_each(bool (*callback)(T, I), I info) const {
175: T *last=felements+fused;
176: for(T *current=felements; current<last; current++)
177: if(callback(*current, info))
178: return;
179: }
180:
181: /// iterate over all elements
1.60 paf 182: template<typename I> void for_each_ref(void (*callback)(T&, I), I info) {
1.59 paf 183: T *last=felements+fused;
184: for(T *current=felements; current<last; current++)
185: callback(*current, info);
186: }
1.49 paf 187:
1.59 paf 188: /// iterate over all elements until condition becomes true, return that element
189: template<typename I> T first_that(bool (*callback)(T, I), I info) const {
190: T *last=felements+fused;
191: for(T *current=felements; current<last; current++)
192: if(callback(*current, info))
193: return *current;
1.1 paf 194:
1.59 paf 195: return T(0);
196: }
1.1 paf 197:
1.76 misha 198: inline T* ptr(size_t index){
199: return felements + index;
200: }
201:
1.59 paf 202: protected:
1.1 paf 203:
1.59 paf 204: bool is_full() {
205: return fused == fallocated;
206: }
207: void expand(size_t delta) {
1.71 misha 208: if(fallocated){
209: size_t new_allocated=fallocated+delta;
1.77 misha 210: felements=(T *)pa_realloc(felements, new_allocated*sizeof(T));
1.71 misha 211: fallocated=new_allocated;
212: } else {
213: fallocated=delta;
1.77 misha 214: felements=(T *)pa_malloc(fallocated*sizeof(T));
1.71 misha 215: }
1.1 paf 216: }
1.2 paf 217:
1.1 paf 218: private: //disabled
219:
1.59 paf 220: Array(const Array&) {}
1.12 paf 221: Array& operator = (const Array&) { return *this; }
1.42 parser 222: };
223:
224:
1.59 paf 225: /** Array iterator, usage:
226: @code
227: // Array<T> a;
228: for(Array_iterator<T> i(a); i.has_next(); ) {
229: T& element=i.next();
230: ...
231: }
232: @endcode
233: */
234: template<typename T> class Array_iterator {
235:
236: const Array<T>& farray;
237: T *fcurrent;
238: T *flast;
239:
1.42 parser 240: public:
241:
1.59 paf 242: Array_iterator(const Array<T>& aarray): farray(aarray) {
243: fcurrent=farray.felements;
244: flast=farray.felements+farray.count();
1.42 parser 245: }
246:
247: /// there are still elements
248: bool has_next() {
1.59 paf 249: return fcurrent<flast;
1.42 parser 250: }
251:
1.59 paf 252: /// quickly extracts next Array element
1.68 paf 253: T next() {
1.59 paf 254: return *(fcurrent++);
255: }
256:
257: };
1.1 paf 258: #endif