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1.24 paf 1: /** @file
1.59 paf 2: Parser: Array & Array_iterator classes decls.
1.26 paf 3:
1.59 paf 4: Copyright (c) 2001-2003 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:
1.62 ! paf 11: static const char * const IDENT_ARRAY_Y="$Date: 2003/11/20 16:32:12 $";
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;
59: size_t row=offset;
60: if(row>=count)
61: return false;
62: // max(limit)
63: size_t m=reverse?
64: offset
65: :count-offset;
66: if(!m)
67: return false;
68: // fix limit
69: if(limit==ARRAY_OPTION_LIMIT_ALL || limit>m)
70: limit=m;
1.7 paf 71:
1.59 paf 72: return true;
73: }
1.29 paf 74:
1.59 paf 75:
1.1 paf 76: };
77:
1.59 paf 78: typedef T element_type;
79:
80: Array(size_t initial=3):
81: fallocated(initial>3?initial:3),
82: fused(0)
83: {
84: felements=static_cast<T*>(malloc(fallocated*sizeof(T)));
85: }
1.6 paf 86:
1.59 paf 87: /// how many items are in Array
88: size_t count() const { return fused; }
89: /// append to array
90: Array& operator += (T src) {
91: if(is_full())
92: expand(2);
1.7 paf 93:
1.59 paf 94: felements[fused++]=src;
1.24 paf 95:
1.59 paf 96: return *this;
97: }
1.24 paf 98:
99: /// append other Array portion to this one. starting from offset
1.59 paf 100: Array& append(const Array& src,
101: size_t offset=0,
102: size_t limit=ARRAY_OPTION_LIMIT_ALL, //< negative limit means 'all'. zero limit means 'nothing'
103: bool reverse=false) {
104:
105: size_t src_count=src.count();
106: // skip tivials
107: if(!src_count || !limit || offset>=src_count)
108: return *this;
109: // max(limit)
110: size_t m=reverse?
111: 1+offset
112: :src_count-offset;
113: if(!m)
114: return *this;
115: // fix limit
116: if(limit==ARRAY_OPTION_LIMIT_ALL || limit>m)
117: limit=m;
118:
119: ssize_t delta=reverse?
120: (ssize_t)limit
121: :limit-(fallocated-fused);
122: if(delta>0)
123: expand(delta);
124:
125: T* from=&src.felements[offset];
126: T* to=&felements[fused];
127: if(reverse) { // reverse
128: for(T* from_end=from-limit; from>from_end; --from)
129: *to++=*from;
130:
131: } else { // forward
132: for(T* from_end=from+limit; from<from_end; from++)
133: *to++=*from;
134: }
135:
136: fused+=limit;
137: return *this;
138: }
139:
140: /// get index-element
141: T get(size_t index) const {
142: assert(index>=0 && index<count());
143: return felements[index];
144: }
145:
146: /// ref version of get
147: T& get_ref(size_t index) const {
148: assert(index>=0 && index<count());
149: return felements[index];
150: }
151:
152: /// put index-element
153: void put(size_t index, T element) {
154: assert(index>=0 && index<count());
155: felements[index]=element;
156: }
157:
158: T operator [](size_t index) const { return get(index); }
1.29 paf 159:
160: /// iterate over all elements
1.59 paf 161: template<typename I> void for_each(void (*callback)(T, I), I info) const {
1.60 paf 162: T *last=felements+fused;
163: for(T *current=felements; current<last; current++)
164: callback(*current, info);
165: }
166:
167: /// iterate over all elements
168: template<typename I> void for_each_ref(void (*callback)(T&, I), I info) {
1.59 paf 169: T *last=felements+fused;
170: for(T *current=felements; current<last; current++)
171: callback(*current, info);
172: }
1.49 paf 173:
1.59 paf 174: /// iterate over all elements until condition becomes true, return that element
175: template<typename I> T first_that(bool (*callback)(T, I), I info) const {
176: T *last=felements+fused;
177: for(T *current=felements; current<last; current++)
178: if(callback(*current, info))
179: return *current;
1.1 paf 180:
1.59 paf 181: return T(0);
182: }
1.1 paf 183:
1.59 paf 184: protected:
1.1 paf 185:
1.59 paf 186: bool is_full() {
187: return fused == fallocated;
188: }
189: void expand(size_t delta) {
190: size_t new_allocated=fallocated+delta;
191: felements = (T *)realloc(felements, new_allocated*sizeof(T));
192: memset(&felements[fallocated], 0, delta*sizeof(T));
193: fallocated=new_allocated;
1.1 paf 194: }
1.2 paf 195:
1.1 paf 196: private: //disabled
197:
1.59 paf 198: Array(const Array&) {}
1.12 paf 199: Array& operator = (const Array&) { return *this; }
1.42 parser 200: };
201:
202:
1.59 paf 203: /** Array iterator, usage:
204: @code
205: // Array<T> a;
206: for(Array_iterator<T> i(a); i.has_next(); ) {
207: T& element=i.next();
208: ...
209: }
210: @endcode
211: */
212: template<typename T> class Array_iterator {
213:
214: const Array<T>& farray;
215: T *fcurrent;
216: T *flast;
217:
1.42 parser 218: public:
219:
1.59 paf 220: Array_iterator(const Array<T>& aarray): farray(aarray) {
221: fcurrent=farray.felements;
222: flast=farray.felements+farray.count();
1.42 parser 223: }
224:
225: /// there are still elements
226: bool has_next() {
1.59 paf 227: return fcurrent<flast;
1.42 parser 228: }
229:
1.59 paf 230: /// quickly extracts next Array element
231: const T next() {
232: return *(fcurrent++);
233: }
234:
235: };
1.1 paf 236: #endif