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-rw-r--r--linden/indra/newview/rlvmultistringsearch.h191
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1#ifndef RLV_MULTISTRINGSEARCH_H
2#define RLV_MULTISTRINGSEARCH_H
3
4// ============================================================================
5// Template classes for our state machine (2 dimensional array of type T)
6
7// STL vector
8template<typename T> class RlvMultiStringSearchFSM_STL
9{
10public:
11 /*
12 * Constructor/destructor
13 */
14
15 // Initialize the FSM with an initial capacity of 'nCapacity' states
16 RlvMultiStringSearchFSM_STL(size_t nCapacity)
17 {
18 m_arFSM.reserve(nCapacity);
19
20 T* pT;
21 for (size_t idx = 0; idx < nCapacity; idx++)
22 {
23 // The width of each row is determined by the alphabet we're using (in this case UTF-8
24 // so while every character might consist of multiple bytes there are
25 // still only 256 'columns' in the state machine)
26 pT = new T[256]();
27
28 // The above *should* initialize to 0 but since we can't account for every compiler doing it :(
29 memset(pT, 0, sizeof(T) * 256);
30
31 m_arFSM.push_back(pT);
32 }
33 };
34
35 ~RlvMultiStringSearchFSM_STL()
36 {
37 // Free any memory we previously allocated
38 for (int idx = 0, cnt = m_arFSM.size(); idx < cnt; idx++)
39 delete[] m_arFSM[idx];
40 }
41
42 /*
43 * Operators
44 */
45 // ASSERTION: nState < m_arFSM.size() at all times
46 // In other words: do *NOT* go out of bounds on the array (no memory will have allocated for that non-existing state)
47 // (There probably should be a check for that even in release but it seems wasteful, just don't do it :p)
48 inline T* operator[](size_t nState)
49 {
50 //#ifdef _DEBUG
51 // assert( nState < m_arFSM.size() );
52 //#endif // _DEBUG
53
54 return m_arFSM[nState];
55 }
56 inline const T* operator[](size_t nState) const
57 {
58 //#ifdef _DEBUG
59 // assert( nState < m_arFSM.size() );
60 //#endif // _DEBUG
61
62 return m_arFSM[nState];
63 }
64
65 /*
66 * Public member functions
67 */
68
69 size_t getSize() const { return m_arFSM.size(); }
70
71 void resize(size_t nNewCapacity)
72 {
73 // Get our current capacity (only rows > capacity need memory allocated)
74 size_t nCurCapacity = m_arFSM.capacity();
75
76 // Only expand, never shrink
77 if (nNewCapacity <= nCurCapacity)
78 {
79 //#ifdef _DEBUG
80 // assert(false);
81 //#endif //_DEBUG
82
83 return;
84 }
85 m_arFSM.resize(nNewCapacity);
86
87 // For each new state we added, allocate memory for the columns
88 for(size_t idx = nCurCapacity; idx < nNewCapacity; idx++)
89 // The memset is redundant (or rather *should* be) but since we can't account for every compiler doing it :(
90 m_arFSM[idx] = (T*)memset(new T[256](), 0, sizeof(T) * 256);
91 }
92
93protected:
94 /*
95 * Member variables
96 */
97 std::vector<T*> m_arFSM;
98};
99
100// ============================================================================
101
102struct RlvMultiStringSearchMatch
103{
104 int idxMatch; // Starting character index into the string of the matched keyword (-1 if no match)
105 int lenMatch; // Length of the matched keyword (undefined if no match)
106 U16 nParam; // User supplied parameter for the matched keyword (undefined if no match)
107
108 RlvMultiStringSearchMatch() : idxMatch(-1) {}
109};
110
111// ============================================================================
112// The actual search class
113
114class RlvMultiStringSearch
115{
116public:
117 /*
118 * Constructor/destructor
119 */
120 RlvMultiStringSearch();
121 //~RlvMultiStringSearch();
122
123 /*
124 * Public member functions
125 */
126
127 // Add a keyword to the state machine (if it already exists then it will simply overwrite the existing parameter)
128 void addKeyword(const std::string& strKeyword, U16 nParam);
129
130 BOOL getExactMatchParam(const std::string& strText, U16& nParam) const
131 {
132 RlvMultiStringSearchMatch match;
133 if (findFirst(strText, match))
134 {
135 // We have an exact match if the starting index is 0
136 // and the length of the match matches the length of the string
137 if ( (0 == match.idxMatch) && (match.lenMatch == (int)strText.length()) )
138 {
139 nParam = match.nParam;
140 return TRUE;
141 }
142 }
143
144 return FALSE; // Fall-through: no (exact) match
145 }
146
147 // Finds the first occurance of any keyword in the supplied string
148 bool findFirst(const std::string& strText, RlvMultiStringSearchMatch& match) const;
149 // Finds the next occurance of any keyword in the supplied string
150 bool findNext(const std::string& strText, int idxCh, RlvMultiStringSearchMatch& match) const;
151 // Finds all occurances of any keyword in the supplied string
152 std::vector<RlvMultiStringSearchMatch> findAll(const std::string& strText);
153 // Finds the last occurance of any keyword in the supplied string (non-optimized)
154 bool findLast(const std::string& strText, RlvMultiStringSearchMatch& match) const;
155
156protected:
157 // Finds the next occurance of any keyword in the supplied string
158 bool findNext(const char* pstrText, int idxCh, int cntCh, RlvMultiStringSearchMatch& match, bool fWordMatch = true) const;
159
160 /*
161 * Member variables
162 */
163 RlvMultiStringSearchFSM_STL<U32> m_FSM; // Our finite state machine (4 bytes * 256 = 1Kb of memory/state)
164 // HIWORD(U32) = 16-bits of user data
165 // LOWORD(U32) = ABBBBBBBBBBBBBBB
166 // A = termination bit
167 // If (set) and (B == 0): match
168 // If (set) and (B != 0): match, but might only be a substring of another keyword
169 // B = next state (0..32767)
170 // If (B == 0): false lead -> backtrack
171 // If (B != 0): partial keyword match, next state
172 size_t m_cntState; // The number of states in the FSM (= the number of *used* rows in the array)
173};
174
175// ============================================================================
176// Inlined member functions
177//
178
179inline bool RlvMultiStringSearch::findFirst(const std::string& strText, RlvMultiStringSearchMatch& match) const
180{
181 return findNext(strText.c_str(), 0, strText.length(), match);
182}
183
184inline bool RlvMultiStringSearch::findNext(const std::string& strText, int idxCh, RlvMultiStringSearchMatch& match) const
185{
186 return findNext(strText.c_str(), idxCh, strText.length(), match);
187}
188
189// ============================================================================
190
191#endif // RLV_MULTISTRINGSEARCH_H