##// END OF EJS Templates
implab » ImplabNet
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rewritten the text scanner
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r176:0c3c69fe225b ref20160224
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1 using System;
2 using System.IO;
3
4 namespace Implab.Formats {
5 public class ReaderScanner: TextScanner {
6 const int CHUNK_SIZE = 1024;
7 const int BUFFER_MAX = CHUNK_SIZE*1024;
8
9 readonly TextReader m_reader;
10
11 public ReaderScanner(TextReader reader, int limit, int chunk) : base(limit, chunk) {
12 Safe.ArgumentNotNull(reader, "reader");
13 m_reader = reader;
14 }
15
16 public ReaderScanner(TextReader reader) : this(reader, BUFFER_MAX, CHUNK_SIZE) {
17 }
18
19 protected override int Read(char[] buffer, int offset, int size) {
20 return m_reader.Read(buffer, offset, size);
21 }
22
23 protected override void Dispose(bool disposing) {
24 if (disposing)
25 Safe.Dispose(m_reader);
26 base.Dispose(disposing);
27 }
28 }
29 }
30
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1 using System;
2
3 namespace Implab.Formats {
4 public class ScannerContext<TTag> {
5 public int[,] Dfa { get; private set; }
6 public bool[] Final { get; private set; }
7 public TTag[][] Tags { get; private set; }
8 public int State { get; private set; }
9 public int[] Alphabet { get; private set; }
10
11 public ScannerContext(int[,] dfa, bool[] final, TTag[][] tags, int state, int[] alphabet) {
12 Dfa = dfa;
13 Final = final;
14 Tags = tags;
15 State = state;
16 Alphabet = alphabet;
17 }
18
19 public bool Execute(TextScanner scanner, out TTag[] tag) {
20 return scanner.ReadToken(Dfa, Final, Tags, State, Alphabet, out tag);
21 }
22 }
23 }
24
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1 using System;
2
3 namespace Implab.Formats {
4 public class StringScanner: TextScanner {
5 const int CHUNK_SIZE = 1024;
6
7 readonly string m_text;
8 int m_pos;
9
10 public StringScanner(string text) : base(text.Length, text.Length < CHUNK_SIZE ? text.Length : CHUNK_SIZE) {
11 m_text = text;
12 Feed();
13 }
14
15 protected override int Read(char[] buffer, int offset, int size) {
16 var actual = size + m_pos > m_text.Length ? m_text.Length - m_pos : size;
17
18 m_text.CopyTo(m_pos,buffer,offset, actual);
19
20 m_pos += actual;
21
22 return actual;
23 }
24 }
25 }
26
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@@ -1,305 +1,313
1 1 using Implab;
2 2 using System;
3 3 using System.Collections.Generic;
4 4 using System.Linq;
5 5
6 6 namespace Implab.Automaton {
7 7 public class DFATable : IDFATableBuilder {
8 8 int m_stateCount;
9 9 int m_symbolCount;
10 10 int m_initialState;
11 11
12 12 readonly HashSet<int> m_finalStates = new HashSet<int>();
13 13 readonly HashSet<AutomatonTransition> m_transitions = new HashSet<AutomatonTransition>();
14 14
15 15
16 16 #region IDFADefinition implementation
17 17
18 18 public bool IsFinalState(int s) {
19 19 Safe.ArgumentInRange(s, 0, m_stateCount, "s");
20 20
21 21 return m_finalStates.Contains(s);
22 22 }
23 23
24 24 public IEnumerable<int> FinalStates {
25 25 get {
26 26 return m_finalStates;
27 27 }
28 28 }
29 29
30 30 public int StateCount {
31 31 get { return m_stateCount; }
32 32 }
33 33
34 34 public int AlphabetSize {
35 35 get { return m_symbolCount; }
36 36 }
37 37
38 38 public int InitialState {
39 39 get { return m_initialState; }
40 40 }
41 41
42 42 #endregion
43 43
44 44 public void SetInitialState(int s) {
45 45 Safe.ArgumentAssert(s >= 0, "s");
46 46 m_initialState = s;
47 47 }
48 48
49 49 public void MarkFinalState(int state) {
50 50 m_finalStates.Add(state);
51 51 }
52 52
53 53 public void Add(AutomatonTransition item) {
54 54 Safe.ArgumentAssert(item.s1 >= 0, "item");
55 55 Safe.ArgumentAssert(item.s2 >= 0, "item");
56 56 Safe.ArgumentAssert(item.edge >= 0, "item");
57 57
58 58 m_stateCount = Math.Max(m_stateCount, Math.Max(item.s1, item.s2) + 1);
59 59 m_symbolCount = Math.Max(m_symbolCount, item.edge);
60 60
61 61 m_transitions.Add(item);
62 62 }
63 63
64 64 public void Clear() {
65 65 m_stateCount = 0;
66 66 m_symbolCount = 0;
67 67 m_finalStates.Clear();
68 68 m_transitions.Clear();
69 69 }
70 70
71 71 public bool Contains(AutomatonTransition item) {
72 72 return m_transitions.Contains(item);
73 73 }
74 74
75 75 public void CopyTo(AutomatonTransition[] array, int arrayIndex) {
76 76 m_transitions.CopyTo(array, arrayIndex);
77 77 }
78 78
79 79 public bool Remove(AutomatonTransition item) {
80 80 m_transitions.Remove(item);
81 81 }
82 82
83 83 public int Count {
84 84 get {
85 85 return m_transitions.Count;
86 86 }
87 87 }
88 88
89 89 public bool IsReadOnly {
90 90 get {
91 91 return false;
92 92 }
93 93 }
94 94
95 95 public IEnumerator<AutomatonTransition> GetEnumerator() {
96 96 return m_transitions.GetEnumerator();
97 97 }
98 98
99 99 System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator() {
100 100 return GetEnumerator();
101 101 }
102 102
103 public DFAStateDescriptor[] CreateTransitionTable() {
104 var table = new DFAStateDescriptor[StateCount];
103 public int[,] CreateTransitionTable() {
104 var table = new int[StateCount,AlphabetSize];
105
106 for (int i = 0; i < StateCount; i++)
107 for (int j = 0; i < AlphabetSize; j++)
108 table[i, j] = DFAConst.UNREACHABLE_STATE;
105 109
106 foreach (var t in this) {
107 if (table[t.s1].transitions == null)
108 table[t.s1] = new DFAStateDescriptor(AlphabetSize, IsFinalState(t.s1));
109 if (table[t.s2].transitions == null)
110 table[t.s2] = new DFAStateDescriptor(AlphabetSize, IsFinalState(t.s2));
111 table[t.s1].transitions[t.edge] = t.s2;
110 foreach (var t in this)
111 table[t.s1,t.edge] = t.s2;
112
113 return table;
112 114 }
113 115
116 public bool[] CreateFinalStateTable() {
117 var table = new bool[StateCount];
118
119 foreach (var s in FinalStates)
120 table[s] = true;
121
114 122 return table;
115 123 }
116 124
117 125 /// <summary>Формирует множества конечных состояний перед началом работы алгоритма минимизации.</summary>
118 126 /// <remarks>
119 127 /// В процессе построения минимального автомата требуется разделить множество состояний,
120 128 /// на два подмножества - конечные состояния и все остальные, после чего эти подмножества
121 129 /// будут резделены на более мелкие. Иногда требуется гарантировать различия конечных сосотяний,
122 130 /// для этого необходимо переопределить даннцю фукнцию, для получения множеств конечных состояний.
123 131 /// </remarks>
124 132 /// <returns>The final states.</returns>
125 133 protected virtual IEnumerable<HashSet<int>> GroupFinalStates() {
126 134 return new HashSet<int>[] { m_finalStates };
127 135 }
128 136
129 137 protected void Optimize(
130 138 IDFATableBuilder optimalDFA,
131 139 IDictionary<int,int> alphabetMap,
132 140 IDictionary<int,int> stateMap
133 141 ) {
134 142 Safe.ArgumentNotNull(optimalDFA, "dfa");
135 143 Safe.ArgumentNotNull(alphabetMap, "alphabetMap");
136 144 Safe.ArgumentNotNull(stateMap, "stateMap");
137 145
138 146
139 147 var setComparer = new CustomEqualityComparer<HashSet<int>>(
140 148 (x, y) => x.SetEquals(y),
141 149 s => s.Sum(x => x.GetHashCode())
142 150 );
143 151
144 152 var optimalStates = new HashSet<HashSet<int>>(setComparer);
145 153 var queue = new HashSet<HashSet<int>>(setComparer);
146 154
147 155 // получаем конечные состояния, сгруппированные по маркерам
148 156 optimalStates.UnionWith(
149 157 GroupFinalStates()
150 158 );
151 159
152 160 var state = new HashSet<int>(
153 161 Enumerable
154 162 .Range(0, m_stateCount - 1)
155 163 .Where(i => !m_finalStates.Contains(i))
156 164 );
157 165
158 166 optimalStates.Add(state);
159 167 queue.Add(state);
160 168
161 169 var rmap = m_transitions
162 170 .GroupBy(t => t.s2)
163 171 .ToLookup(
164 172 g => g.Key, // s2
165 173 g => g.ToLookup(t => t.edge, t => t.s1)
166 174 );
167 175
168 176 while (queue.Count > 0) {
169 177 var stateA = queue.First();
170 178 queue.Remove(stateA);
171 179
172 180 for (int c = 0; c < m_symbolCount; c++) {
173 181 var stateX = new HashSet<int>();
174 182 foreach(var a in stateA)
175 183 stateX.UnionWith(rmap[a][c]); // all states from wich 'c' leads to 'a'
176 184
177 185 foreach (var stateY in optimalStates.ToArray()) {
178 186 if (stateX.Overlaps(stateY) && !stateY.IsSubsetOf(stateX)) {
179 187 var stateR1 = new HashSet<int>(stateY);
180 188 var stateR2 = new HashSet<int>(stateY);
181 189
182 190 stateR1.IntersectWith(stateX);
183 191 stateR2.ExceptWith(stateX);
184 192
185 193 optimalStates.Remove(stateY);
186 194 optimalStates.Add(stateR1);
187 195 optimalStates.Add(stateR2);
188 196
189 197 if (queue.Contains(stateY)) {
190 198 queue.Remove(stateY);
191 199 queue.Add(stateR1);
192 200 queue.Add(stateR2);
193 201 } else {
194 202 queue.Add(stateR1.Count <= stateR2.Count ? stateR1 : stateR2);
195 203 }
196 204 }
197 205 }
198 206 }
199 207 }
200 208
201 209 // карта получения оптимального состояния по соотвествующему ему простому состоянию
202 210 var nextState = 0;
203 211 foreach (var item in optimalStates) {
204 212 var id = nextState++;
205 213 foreach (var s in item)
206 214 stateMap[s] = id;
207 215 }
208 216
209 217 // получаем минимальный алфавит
210 218 // входные символы не различимы, если Move(s,a1) == Move(s,a2), для любого s
211 219 // для этого используем алгоритм кластеризации, сначала
212 220 // считаем, что все символы не различимы
213 221
214 222 var minClasses = new HashSet<HashSet<int>>(setComparer);
215 223 var alphaQueue = new Queue<HashSet<int>>();
216 224 alphaQueue.Enqueue(new HashSet<int>(Enumerable.Range(0,AlphabetSize)));
217 225
218 226 // для всех состояний, будем проверять каждый класс на различимость,
219 227 // т.е. символы различимы, если они приводят к разным состояниям
220 228 for (int s = 0 ; s < optimalStates.Count; s++) {
221 229 var newQueue = new Queue<HashSet<int>>();
222 230
223 231 foreach (var A in alphaQueue) {
224 232 // классы из одного символа делить бесполезно, переводим их сразу в
225 233 // результирующий алфавит
226 234 if (A.Count == 1) {
227 235 minClasses.Add(A);
228 236 continue;
229 237 }
230 238
231 239 // различаем классы символов, которые переводят в различные оптимальные состояния
232 240 // optimalState -> alphaClass
233 241 var classes = new Dictionary<int, HashSet<int>>();
234 242
235 243 foreach (var term in A) {
236 244 // ищем все переходы класса по символу term
237 245 var res = m_transitions.Where(t => stateMap[t.s1] == s && t.edge == term).Select(t => stateMap[t.s2]).ToArray();
238 246
239 247 var s2 = res.Length > 0 ? res[0] : -1;
240 248
241 249 HashSet<int> a2;
242 250 if (!classes.TryGetValue(s2, out a2)) {
243 251 a2 = new HashSet<int>();
244 252 newQueue.Enqueue(a2);
245 253 classes[s2] = a2;
246 254 }
247 255 a2.Add(term);
248 256 }
249 257 }
250 258
251 259 if (newQueue.Count == 0)
252 260 break;
253 261 alphaQueue = newQueue;
254 262 }
255 263
256 264 // после окончания работы алгоритма в очереди останутся минимальные различимые классы
257 265 // входных символов
258 266 foreach (var A in alphaQueue)
259 267 minClasses.Add(A);
260 268
261 269 // построение отображения алфавитов входных символов.
262 270 // поскольку символ DFAConst.UNCLASSIFIED_INPUT может иметь
263 271 // специальное значение, тогда сохраним минимальный класс,
264 272 // содержащий этот символ на томже месте.
265 273
266 274 var nextCls = 0;
267 275 foreach (var item in minClasses) {
268 276 if (nextCls == DFAConst.UNCLASSIFIED_INPUT)
269 277 nextCls++;
270 278
271 279 // сохраняем DFAConst.UNCLASSIFIED_INPUT
272 280 var cls = item.Contains(DFAConst.UNCLASSIFIED_INPUT) ? DFAConst.UNCLASSIFIED_INPUT : nextCls;
273 281
274 282 foreach (var a in item)
275 283 alphabetMap[a] = cls;
276 284
277 285 nextCls++;
278 286 }
279 287
280 288 // построение автомата
281 289 optimalDFA.SetInitialState(stateMap[m_initialState]);
282 290
283 291 foreach (var sf in m_finalStates.Select(s => stateMap[s]).Distinct())
284 292 optimalDFA.MarkFinalState(sf);
285 293
286 294 foreach (var t in m_transitions.Select(t => new AutomatonTransition(stateMap[t.s1],stateMap[t.s2],alphabetMap[t.edge])).Distinct())
287 295 optimalDFA.Add(t);
288 296 }
289 297
290 298 protected void PrintDFA<TInput, TState>(IAlphabet<TInput> inputAlphabet, IAlphabet<TState> stateAlphabet) {
291 299 Safe.ArgumentNotNull(inputAlphabet, "inputAlphabet");
292 300 Safe.ArgumentNotNull(stateAlphabet, "stateAlphabet");
293 301
294 302 foreach(var t in m_transitions)
295 303 Console.WriteLine(
296 304 "[{0}] -{{{1}}}-> [{2}]{3}",
297 305 String.Join(",", stateAlphabet.GetSymbols(t.s1)),
298 306 String.Join("", inputAlphabet.GetSymbols(t.edge)),
299 307 String.Join(",", stateAlphabet.GetSymbols(t.s2)),
300 308 m_finalStates.Contains(t.s2) ? "$" : ""
301 309 );
302 310 }
303 311
304 312 }
305 313 }
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@@ -1,94 +1,50
1 1 using Implab;
2 2 using System;
3 3 using System.Collections.Generic;
4 4 using System.Diagnostics;
5 5 using System.Linq;
6 6
7 7 namespace Implab.Automaton {
8 8 /// <summary>
9 9 /// Indexed alphabet is the finite set of symbols where each symbol has a zero-based unique index.
10 10 /// </summary>
11 11 /// <remarks>
12 12 /// Indexed alphabets are usefull in bulting efficient translations from source alphabet
13 13 /// to the input alphabet of the automaton. It's assumed that the index to the symbol match
14 14 /// is well known and documented.
15 15 /// </remarks>
16 public abstract class IndexedAlphabetBase<T> : IAlphabetBuilder<T> {
17 int m_nextId = 1;
18 readonly int[] m_map;
19
20 protected IndexedAlphabetBase(int mapSize) {
21 m_map = new int[mapSize];
22 }
23
24 protected IndexedAlphabetBase(int[] map) {
25 Debug.Assert(map != null && map.Length > 0);
26 Debug.Assert(map.All(x => x >= 0));
27
28 m_map = map;
29 m_nextId = map.Max() + 1;
30 }
31
32 public int DefineSymbol(T symbol) {
33 var index = GetSymbolIndex(symbol);
34 if (m_map[index] == DFAConst.UNCLASSIFIED_INPUT)
35 m_map[index] = m_nextId++;
36 return m_map[index];
37 }
38
39 public int DefineSymbol(T symbol, int cls) {
40 var index = GetSymbolIndex(symbol);
41 m_map[index] = cls;
42 m_nextId = Math.Max(cls + 1, m_nextId);
43 return cls;
44 }
16 public abstract class IndexedAlphabetBase<T> : MapAlphabet<T> {
45 17
46 public int DefineClass(IEnumerable<T> symbols) {
47 return DefineClass(symbols, m_nextId);
48 }
49
50 public int DefineClass(IEnumerable<T> symbols, int cls) {
51 Safe.ArgumentNotNull(symbols, "symbols");
52 symbols = symbols.Distinct();
53
54 foreach (var symbol in symbols)
55 m_map[GetSymbolIndex(symbol)] = cls;
56
57 m_nextId = Math.Max(cls + 1, m_nextId);
58
59 return cls;
60 }
61
62 public virtual int Translate(T symbol) {
63 return m_map[GetSymbolIndex(symbol)];
64 }
65
66 public int Count {
67 get { return m_nextId; }
68 }
69
70 public bool Contains(T symbol) {
71 return true;
72 }
73
74 public IEnumerable<T> GetSymbols(int cls) {
75 for (var i = 0; i < m_map.Length; i++)
76 if (m_map[i] == cls)
77 yield return GetSymbolByIndex(i);
18 protected IndexedAlphabetBase() :base(true, null) {
78 19 }
79 20
80 21 public abstract int GetSymbolIndex(T symbol);
81 22
82 public abstract T GetSymbolByIndex(int index);
83
84 public abstract IEnumerable<T> InputSymbols { get; }
85
86 23 /// <summary>
87 24 /// Gets the translation map from the index of the symbol to it's class this is usefull for the optimized input symbols transtaion.
88 25 /// </summary>
26 /// <remarks>
27 /// The map is continous and start from the symbol with zero code. The last symbol
28 /// in the map is the last classified symbol in the alphabet, i.e. the map can be
29 /// shorter then the whole alphabet.
30 /// </remarks>
89 31 /// <returns>The translation map.</returns>
90 32 public int[] GetTranslationMap() {
91 return m_map;
33 Dictionary<int,int> map = new Dictionary<int, int>();
34
35 int max;
36 foreach (var p in Mappings) {
37 var index = GetSymbolIndex(p.Key);
38 max = Math.Max(max, index);
39 map[index] = p.Value;
40 }
41
42 var result = new int[max + 1];
43
44 for (int i = 0; i < result.Length; i++)
45 map.TryGetValue(i, out result[i]);
46
47 return result;
92 48 }
93 49 }
94 50 }
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@@ -1,77 +1,84
1 1 using System;
2 2 using System.Collections.Generic;
3 3 using System.Linq;
4 4
5 5 namespace Implab.Automaton {
6 6 public class MapAlphabet<T> : IAlphabetBuilder<T> {
7 7 readonly Dictionary<T,int> m_map;
8 8 int m_nextCls;
9 9 readonly bool m_supportUnclassified;
10 10
11 11 public MapAlphabet(bool supportUnclassified, IEqualityComparer<T> comparer) {
12 12 m_map = comparer != null ? new Dictionary<T, int>(comparer) : new Dictionary<T,int>();
13 13 m_supportUnclassified = supportUnclassified;
14 14 m_nextCls = supportUnclassified ? 1 : 0;
15 15 }
16 16
17 17 #region IAlphabetBuilder implementation
18 18
19 19 public int DefineSymbol(T symbol) {
20 20 int cls;
21 21 return m_map.TryGetValue(symbol, out cls) ? cls : DefineSymbol(symbol, m_nextCls);
22 22 }
23 23
24 24 public int DefineSymbol(T symbol, int cls) {
25 25 Safe.ArgumentAssert(cls >= 0, "cls");
26 26
27 27 m_nextCls = Math.Max(cls + 1, m_nextCls);
28 28 m_map.Add(symbol, cls);
29 29 return cls;
30 30 }
31 31
32 32 public int DefineClass(IEnumerable<T> symbols) {
33 33 return DefineClass(symbols, m_nextCls);
34 34 }
35 35
36 36 public int DefineClass(IEnumerable<T> symbols, int cls) {
37 37 Safe.ArgumentAssert(cls >= 0, "cls");
38 38 Safe.ArgumentNotNull(symbols, "symbols");
39 39
40 40 m_nextCls = Math.Max(cls + 1, m_nextCls);
41 41
42 42 foreach (var symbol in symbols)
43 43 m_map[symbol] = cls;
44 44 return cls;
45 45 }
46 46
47 47 #endregion
48 48
49 49 #region IAlphabet implementation
50 50
51 51 public int Translate(T symbol) {
52 52 int cls;
53 53 if (m_map.TryGetValue(symbol, out cls))
54 54 return cls;
55 55 if (!m_supportUnclassified)
56 56 throw new ArgumentOutOfRangeException("symbol", "The specified symbol isn't in the alphabet");
57 57 return DFAConst.UNCLASSIFIED_INPUT;
58 58 }
59 59
60 60 public int Count {
61 61 get {
62 62 return m_nextCls;
63 63 }
64 64 }
65 65
66 66 public bool Contains(T symbol) {
67 67 return m_supportUnclassified || m_map.ContainsKey(symbol);
68 68 }
69 69
70 70
71 71 public IEnumerable<T> GetSymbols(int cls) {
72 Safe.ArgumentAssert(cls > 0, "cls");
72 73 return m_map.Where(p => p.Value == cls).Select(p => p.Key);
73 74 }
74 75 #endregion
76
77 public IEnumerable<KeyValuePair<T,int>> Mappings {
78 get {
79 return m_map;
80 }
81 }
75 82 }
76 83 }
77 84
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@@ -1,89 +1,98
1 1 using Implab;
2 2 using System;
3 3 using System.Collections.Generic;
4 4 using System.Linq;
5 5
6 6 namespace Implab.Automaton.RegularExpressions {
7 7 /// <summary>
8 8 /// Базовый абстрактный класс. Грамматика, позволяет формулировать выражения над алфавитом типа <c>char</c>.
9 9 /// </summary>
10 10 public abstract class Grammar<TSymbol, TTag> {
11 11
12 12 protected abstract IAlphabetBuilder<TSymbol> AlphabetBuilder {
13 13 get;
14 14 }
15 15
16 16 protected SymbolToken<TTag> UnclassifiedToken() {
17 17 return new SymbolToken<TTag>(DFAConst.UNCLASSIFIED_INPUT);
18 18 }
19 19
20 20 protected void DefineAlphabet(IEnumerable<TSymbol> alphabet) {
21 21 Safe.ArgumentNotNull(alphabet, "alphabet");
22 22
23 23 foreach (var ch in alphabet)
24 24 AlphabetBuilder.DefineSymbol(ch);
25 25 }
26 26
27 27 protected Token<TTag> SymbolToken(TSymbol symbol) {
28 28 return Token<TTag>.New(TranslateOrAdd(symbol));
29 29 }
30 30
31 31 protected Token<TTag> SymbolToken(IEnumerable<TSymbol> symbols) {
32 32 Safe.ArgumentNotNull(symbols, "symbols");
33 33
34 34 return Token<TTag>.New(TranslateOrAdd(symbols).ToArray());
35 35 }
36 36
37 37 protected Token<TTag> SymbolSetToken(params TSymbol[] set) {
38 38 return SymbolToken(set);
39 39 }
40 40
41 41 int TranslateOrAdd(TSymbol ch) {
42 42 var t = AlphabetBuilder.Translate(ch);
43 43 if (t == DFAConst.UNCLASSIFIED_INPUT)
44 44 t = AlphabetBuilder.DefineSymbol(ch);
45 45 return t;
46 46 }
47 47
48 48 IEnumerable<int> TranslateOrAdd(IEnumerable<TSymbol> symbols) {
49 49 return symbols.Distinct().Select(TranslateOrAdd);
50 50 }
51 51
52 52 int TranslateOrDie(TSymbol ch) {
53 53 var t = AlphabetBuilder.Translate(ch);
54 54 if (t == DFAConst.UNCLASSIFIED_INPUT)
55 55 throw new ApplicationException(String.Format("Symbol '{0}' is UNCLASSIFIED", ch));
56 56 return t;
57 57 }
58 58
59 59 IEnumerable<int> TranslateOrDie(IEnumerable<TSymbol> symbols) {
60 60 return symbols.Distinct().Select(TranslateOrDie);
61 61 }
62 62
63 63 protected Token<TTag> SymbolTokenExcept(IEnumerable<TSymbol> symbols) {
64 64 Safe.ArgumentNotNull(symbols, "symbols");
65 65
66 66 return Token<TTag>.New( Enumerable.Range(0, AlphabetBuilder.Count).Except(TranslateOrDie(symbols)).ToArray() );
67 67 }
68 68
69 protected abstract IAlphabetBuilder<TSymbol> CreateAlphabet();
69 protected abstract IndexedAlphabetBase<TSymbol> CreateAlphabet();
70 70
71 protected RegularDFA<TSymbol, TTag> BuildDFA(Token<TTag> regexp) {
71 protected ScannerContext<TTag> BuildScannerContext(Token<TTag> regexp) {
72 72
73 73 var dfa = new RegularDFA<TSymbol, TTag>(AlphabetBuilder);
74 74
75 75 var visitor = new RegularExpressionVisitor<TTag>();
76 76 regexp.Accept( visitor );
77 77
78 78 visitor.BuildDFA(dfa);
79 79
80 80 if (dfa.IsFinalState(dfa.InitialState))
81 81 throw new ApplicationException("The specified language contains empty token");
82 82
83 return dfa.Optimize(CreateAlphabet());
83 var ab = CreateAlphabet();
84 var optimal = dfa.Optimize(ab);
85
86 return new ScannerContext<TTag>(
87 optimal.CreateTransitionTable(),
88 optimal.CreateFinalStateTable(),
89 optimal.CreateTagTable(),
90 optimal.InitialState,
91 ab.GetTranslationMap()
92 );
84 93 }
85 94
86 95 }
87 96
88 97
89 98 }
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@@ -1,89 +1,84
1 1 using System;
2 2 using System.Collections.Generic;
3 3 using System.Linq;
4 4
5 5 namespace Implab.Automaton.RegularExpressions {
6 6 public class RegularDFA<TInput, TTag> : DFATable, ITaggedDFABuilder<TTag> {
7 7
8 8 readonly Dictionary<int,TTag[]> m_tags = new Dictionary<int, TTag[]>();
9 9 readonly IAlphabet<TInput> m_alphabet;
10 10
11 11 public RegularDFA(IAlphabet<TInput> alphabet) {
12 12 Safe.ArgumentNotNull(alphabet, "aplhabet");
13 13
14 14 m_alphabet = alphabet;
15 15 }
16 16
17 17
18 18 public IAlphabet<TInput> InputAlphabet {
19 19 get {
20 20 return m_alphabet;
21 21 }
22 22 }
23 23
24 24 public void MarkFinalState(int s, TTag[] tags) {
25 25 MarkFinalState(s);
26 26 SetStateTag(s, tags);
27 27 }
28 28
29 29 public void SetStateTag(int s, TTag[] tags) {
30 30 Safe.ArgumentNotNull(tags, "tags");
31 31 m_tags[s] = tags;
32 32 }
33 33
34 34 public TTag[] GetStateTag(int s) {
35 35 TTag[] tags;
36 36 return m_tags.TryGetValue(s, out tags) ? tags : new TTag[0];
37 37 }
38 38
39 public new DFAStateDescriptor<TTag>[] CreateTransitionTable() {
40 var table = new DFAStateDescriptor<TTag>[StateCount];
39 public TTag[][] CreateTagTable() {
40 var table = new TTag[StateCount][];
41 41
42 foreach (var t in this) {
43 if (table[t.s1].transitions == null)
44 table[t.s1] = new DFAStateDescriptor<TTag>(AlphabetSize, IsFinalState(t.s1), GetStateTag(t.s1));
45 if (table[t.s2].transitions == null)
46 table[t.s2] = new DFAStateDescriptor<TTag>(AlphabetSize, IsFinalState(t.s2), GetStateTag(t.s2));
47 table[t.s1].transitions[t.edge] = t.s2;
48 }
42 foreach (var pair in m_tags)
43 table[pair.Key] = pair.Value;
49 44
50 45 return table;
51 46 }
52 47
53 48 /// <summary>
54 49 /// Optimize the specified alphabet.
55 50 /// </summary>
56 51 /// <param name="alphabet">Пустой алфавит, который будет зполнен в процессе оптимизации.</param>
57 52 public RegularDFA<TInput,TTag> Optimize(IAlphabetBuilder<TInput> alphabet) {
58 53 Safe.ArgumentNotNull(alphabet, "alphabet");
59 54
60 55 var dfa = new RegularDFA<TInput, TTag>(alphabet);
61 56
62 57 var states = new DummyAlphabet(StateCount);
63 58 var alphaMap = new Dictionary<int,int>();
64 59 var stateMap = new Dictionary<int,int>();
65 60
66 61 Optimize(dfa, alphaMap, stateMap);
67 62
68 63 // mark tags in the new DFA
69 64 foreach (var g in m_tags.Where(x => x.Key < StateCount).GroupBy(x => stateMap[x.Key], x => x.Value ))
70 65 dfa.SetStateTag(g.Key, g.SelectMany(x => x).ToArray());
71 66
72 67 // make the alphabet for the new DFA
73 68 foreach (var pair in alphaMap)
74 69 alphabet.DefineClass(m_alphabet.GetSymbols(pair.Key), pair.Value);
75 70
76 71 return dfa;
77 72 }
78 73
79 74 protected override IEnumerable<HashSet<int>> GroupFinalStates() {
80 75 var arrayComparer = new CustomEqualityComparer<TTag[]>(
81 76 (x,y) => x.Length == y.Length && x.All(it => y.Contains(it)),
82 77 x => x.Sum(it => x.GetHashCode())
83 78 );
84 79 return FinalStates.GroupBy(x => m_tags[x], arrayComparer).Select(g => new HashSet<int>(g));
85 80 }
86 81
87 82 }
88 83 }
89 84
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@@ -1,29 +1,25
1 1 using System.Collections.Generic;
2 2 using System.Linq;
3 3 using Implab.Automaton;
4 4
5 5 namespace Implab.Formats {
6 6 public class ByteAlphabet : IndexedAlphabetBase<byte> {
7 public ByteAlphabet() : base(byte.MaxValue + 1){
7 public ByteAlphabet() {
8 8 }
9 9
10 10 #region implemented abstract members of IndexedAlphabetBase
11 11
12 12 public override int GetSymbolIndex(byte symbol) {
13 13 return (int)symbol;
14 14 }
15 15
16 public override byte GetSymbolByIndex(int index) {
17 return (byte)index;
18 }
19
20 16 public IEnumerable<byte> InputSymbols {
21 17 get {
22 18 return Enumerable.Range(byte.MinValue, byte.MaxValue).Cast<byte>();
23 19 }
24 20 }
25 21
26 22 #endregion
27 23 }
28 24 }
29 25
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@@ -1,24 +1,19
1 1 using System.Collections.Generic;
2 2 using System.Linq;
3 3 using Implab.Automaton;
4 4
5 5 namespace Implab.Formats {
6 6 public class CharAlphabet: IndexedAlphabetBase<char> {
7 7
8 public CharAlphabet()
9 : base(char.MaxValue + 1) {
8 public CharAlphabet() {
10 9 }
11 10
12 11 public override int GetSymbolIndex(char symbol) {
13 12 return symbol;
14 13 }
15 14
16 public override char GetSymbolByIndex(int index) {
17 return (char)index;
18 }
19
20 public override IEnumerable<char> InputSymbols {
15 public IEnumerable<char> InputSymbols {
21 16 get { return Enumerable.Range(char.MinValue, char.MaxValue).Cast<char>(); }
22 17 }
23 18 }
24 19 }
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@@ -1,116 +1,109
1 1 using System.Linq;
2 2 using Implab.Automaton.RegularExpressions;
3 3 using System;
4 4 using Implab.Automaton;
5 5
6 6 namespace Implab.Formats.JSON {
7 7 class JSONGrammar : Grammar<char,JSONGrammar.TokenType> {
8 8 public enum TokenType {
9 9 None,
10 10 BeginObject,
11 11 EndObject,
12 12 BeginArray,
13 13 EndArray,
14 14 String,
15 15 Number,
16 16 Literal,
17 17 NameSeparator,
18 18 ValueSeparator,
19 19
20 20 StringBound,
21 21 EscapedChar,
22 22 UnescapedChar,
23 EscapedUnicode,
24
25 Minus,
26 Plus,
27 Sign,
28 Integer,
29 Dot,
30 Exp
23 EscapedUnicode
31 24 }
32 25
33 26 static Lazy<JSONGrammar> _instance = new Lazy<JSONGrammar>();
34 27
35 28 public static JSONGrammar Instance {
36 29 get { return _instance.Value; }
37 30 }
38 31
39 readonly RegularDFA<char, TokenType> m_jsonDFA;
40 readonly RegularDFA<char, TokenType> m_stringDFA;
32 readonly ScannerContext<TokenType> m_jsonDFA;
33 readonly ScannerContext<TokenType> m_stringDFA;
41 34
42 35 public JSONGrammar() {
43 36 DefineAlphabet(Enumerable.Range(0, 0x20).Select(x => (char)x));
44 37 var hexDigit = SymbolRangeToken('a','f').Or(SymbolRangeToken('A','F')).Or(SymbolRangeToken('0','9'));
45 38 var digit9 = SymbolRangeToken('1', '9');
46 39 var zero = SymbolToken('0');
47 40 var digit = zero.Or(digit9);
48 41 var dot = SymbolToken('.');
49 42 var minus = SymbolToken('-');
50 43 var sign = SymbolSetToken('-', '+');
51 44 var expSign = SymbolSetToken('e', 'E');
52 45 var letters = SymbolRangeToken('a', 'z');
53 46 var integer = zero.Or(digit9.Cat(digit.EClosure()));
54 47 var frac = dot.Cat(digit.Closure());
55 48 var exp = expSign.Cat(sign.Optional()).Cat(digit.Closure());
56 49 var quote = SymbolToken('"');
57 50 var backSlash = SymbolToken('\\');
58 51 var specialEscapeChars = SymbolSetToken('\\', '"', '/', 'b', 'f', 't', 'n', 'r');
59 52 var unicodeEspace = SymbolToken('u').Cat(hexDigit.Repeat(4));
60 53 var whitespace = SymbolSetToken('\n', '\r', '\t', ' ').EClosure();
61 54 var beginObject = whitespace.Cat(SymbolToken('{')).Cat(whitespace);
62 55 var endObject = whitespace.Cat(SymbolToken('}')).Cat(whitespace);
63 56 var beginArray = whitespace.Cat(SymbolToken('[')).Cat(whitespace);
64 57 var endArray = whitespace.Cat(SymbolToken(']')).Cat(whitespace);
65 58 var nameSep = whitespace.Cat(SymbolToken(':')).Cat(whitespace);
66 59 var valueSep = whitespace.Cat(SymbolToken(',')).Cat(whitespace);
67 60
68 61 var number = minus.Optional().Cat(integer).Cat(frac.Optional()).Cat(exp.Optional());
69 62 var literal = letters.Closure();
70 63 var unescaped = SymbolTokenExcept(Enumerable.Range(0, 0x20).Union(new int[] { '\\', '"' }).Select(x => (char)x));
71 64
72 65 var jsonExpression =
73 66 number.Tag(TokenType.Number)
74 67 .Or(literal.Tag(TokenType.Literal))
75 68 .Or(quote.Tag(TokenType.StringBound))
76 69 .Or(beginObject.Tag(TokenType.BeginObject))
77 70 .Or(endObject.Tag(TokenType.EndObject))
78 71 .Or(beginArray.Tag(TokenType.BeginArray))
79 72 .Or(endArray.Tag(TokenType.EndArray))
80 73 .Or(nameSep.Tag(TokenType.NameSeparator))
81 74 .Or(valueSep.Tag(TokenType.ValueSeparator));
82 75
83 76
84 77 var jsonStringExpression =
85 78 quote.Tag(TokenType.StringBound)
86 79 .Or(backSlash.Cat(specialEscapeChars).Tag(TokenType.EscapedChar))
87 80 .Or(backSlash.Cat(unicodeEspace).Tag(TokenType.EscapedUnicode))
88 81 .Or(unescaped.Closure().Tag(TokenType.UnescapedChar));
89 82
90 83
91 m_jsonDFA = BuildDFA(jsonExpression);
92 m_stringDFA = BuildDFA(jsonStringExpression);
84 m_jsonDFA = BuildScannerContext(jsonExpression);
85 m_stringDFA = BuildScannerContext(jsonStringExpression);
93 86 }
94 87
95 public RegularDFA<char, TokenType> JsonDFA {
88 public ScannerContext<TokenType> JsonDFA {
96 89 get {
97 90 return m_jsonDFA;
98 91 }
99 92 }
100 93
101 public RegularDFA<char,TokenType> JsonStringDFA {
94 public ScannerContext<TokenType> JsonStringDFA {
102 95 get {
103 96 return m_stringDFA;
104 97 }
105 98 }
106 99
107 100 Token<TokenType> SymbolRangeToken(char start, char stop) {
108 101 return SymbolToken(Enumerable.Range(start,stop - start).Cast<char>());
109 102 }
110 103
111 104 protected override IAlphabetBuilder<char> CreateAlphabet() {
112 105 return new CharAlphabet();
113 106 }
114 107
115 108 }
116 109 }
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@@ -1,96 +1,101
1 1 using System;
2 2 using System.Globalization;
3 3 using Implab.Automaton;
4 using System.Text;
5 using Implab.Components;
6 using System.IO;
7 using Implab.Automaton.RegularExpressions;
4 8
5 9 namespace Implab.Formats.JSON {
6 10 /// <summary>
7 11 /// Сканнер (лексер), разбивающий поток символов на токены JSON.
8 12 /// </summary>
9 public class JSONScanner : Scanner<object> {
10 char[] m_stringBuffer;
11 DFAStateDescriptior<>[] m_stringDFA;
12 int[] m_stringAlphabet;
13 public class JSONScanner : Disposable {
14 readonly StringBuilder m_builder = new StringBuilder();
15
16 readonly ScannerContext<JSONGrammar.TokenType> m_jsonScanner = JSONGrammar.Instance.JsonDFA;
17 readonly ScannerContext<JSONGrammar.TokenType> m_stringScanner = JSONGrammar.Instance.JsonStringDFA;
18
19
20 readonly TextScanner m_scanner;
13 21
14 22 /// <summary>
15 23 /// Создает новый экземпляр сканнера
16 24 /// </summary>
17 public JSONScanner()
18 : base(JSONGrammar.Instance.JsonDFA.GetTransitionTable(), JSONGrammar.Instance.JsonDFA.Alphabet.GetTranslationMap()) {
19 m_stringBuffer = new char[1024];
20 var dfa = JSONGrammar.Instance.JsonStringDFA;
21 m_stringAlphabet = dfa.Alphabet.GetTranslationMap();
22 m_stringDFA = dfa.States;
25 public JSONScanner(string text) {
26 Safe.ArgumentNotEmpty(text, "text");
27
28 m_scanner = new StringScanner(text);
29 }
30
31 public JSONScanner(TextReader reader, int bufferMax, int chunkSize) {
32 Safe.ArgumentNotNull(reader, "reader");
33
34 m_scanner = new ReaderScanner(reader);
23 35 }
24 36
25 37 /// <summary>
26 38 /// Читает следующий лексический элемент из входных данных.
27 39 /// </summary>
28 40 /// <param name="tokenValue">Возвращает значение прочитанного токена.</param>
29 41 /// <param name="tokenType">Возвращает тип прочитанного токена.</param>
30 42 /// <returns><c>true</c> - чтение произведено успешно. <c>false</c> - достигнут конец входных данных</returns>
31 43 /// <remarks>В случе если токен не распознается, возникает исключение. Значения токенов обрабатываются, т.е.
32 44 /// в строках обрабатываются экранированные символы, числа становтся типа double.</remarks>
33 45 public bool ReadToken(out object tokenValue, out JsonTokenType tokenType) {
34 if (ReadTokenInternal()) {
35 switch ((JSONGrammar.TokenType)m_currentState.tag[0]) {
46 JSONGrammar.TokenType[] tag;
47 if (m_jsonScanner.Execute(m_scanner, out tag)) {
48 switch (tag[0]) {
36 49 case JSONGrammar.TokenType.StringBound:
37 50 tokenValue = ReadString();
38 51 tokenType = JsonTokenType.String;
39 52 break;
40 53 case JSONGrammar.TokenType.Number:
41 tokenValue = Double.Parse(new String(m_buffer, m_tokenOffset, m_tokenLen), CultureInfo.InvariantCulture);
54 tokenValue = Double.Parse(m_scanner.GetTokenValue(), CultureInfo.InvariantCulture);
42 55 tokenType = JsonTokenType.Number;
43 56 break;
44 57 default:
45 tokenType = (JsonTokenType)m_currentState.tag[0];
46 tokenValue = new String(m_buffer, m_tokenOffset, m_tokenLen);
58 tokenType = (JsonTokenType)tag[0];
59 tokenValue = m_scanner.GetTokenValue();
47 60 break;
48 61 }
49 62 return true;
50 63 }
51 64 tokenValue = null;
52 65 tokenType = JsonTokenType.None;
53 66 return false;
54 67 }
55 68
56 69 string ReadString() {
57 70 int pos = 0;
58 Switch(m_stringDFA, m_stringAlphabet);
59 while (ReadTokenInternal()) {
60 switch ((JSONGrammar.TokenType)m_currentState.tag[0]) {
71 char[] buf = new char[6]; // the buffer for unescaping chars
72
73 JSONGrammar.TokenType[] tag;
74 m_builder.Clear();
75
76 while (m_stringScanner.Execute(m_scanner, out tag)) {
77 switch (tag[0]) {
61 78 case JSONGrammar.TokenType.StringBound:
62 Restore();
63 return new String(m_stringBuffer, 0, pos);
79 return m_builder.ToString();
64 80 case JSONGrammar.TokenType.UnescapedChar:
65 EnsureStringBufferSize(pos + m_tokenLen);
66 Array.Copy(m_buffer, m_tokenOffset, m_stringBuffer, pos, m_tokenLen);
67 pos += m_tokenLen;
81 m_scanner.CopyTokenTo(m_builder);
68 82 break;
69 case JSONGrammar.TokenType.EscapedUnicode:
70 EnsureStringBufferSize(pos + 1);
71 m_stringBuffer[pos] = StringTranslator.TranslateHexUnicode(m_buffer, m_tokenOffset + 2);
83 case JSONGrammar.TokenType.EscapedUnicode: // \xXXXX - unicode escape sequence
84 m_scanner.CopyTokenTo(buf, 0);
85 m_builder.Append(StringTranslator.TranslateHexUnicode(buf, 2));
72 86 pos++;
73 87 break;
74 case JSONGrammar.TokenType.EscapedChar:
75 EnsureStringBufferSize(pos + 1);
76 m_stringBuffer[pos] = StringTranslator.TranslateEscapedChar(m_buffer[m_tokenOffset + 1]);
77 pos++;
88 case JSONGrammar.TokenType.EscapedChar: // \t - escape sequence
89 m_scanner.CopyTokenTo(buf, 0);
90 m_builder.Append(StringTranslator.TranslateEscapedChar(buf[1]));
78 91 break;
79 92 default:
80 93 break;
81 94 }
82 95
83 96 }
84 97
85 98 throw new ParserException("Unexpected end of data");
86 99 }
87
88 void EnsureStringBufferSize(int size) {
89 if (size > m_stringBuffer.Length) {
90 var newBuffer = new char[size];
91 m_stringBuffer.CopyTo(newBuffer, 0);
92 m_stringBuffer = newBuffer;
93 100 }
94 101 }
95 }
96 }
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@@ -1,96 +1,95
1 1 using Implab;
2 using Implab.Parsing;
2 using Implab.Formats;
3 3 using System;
4 4 using System.Collections.Generic;
5 5 using System.Diagnostics;
6 6 using System.Linq;
7 7 using System.Text;
8 8 using System.Threading.Tasks;
9 9
10 namespace Implab.JSON {
10 namespace Implab.Formats.JSON {
11 11 /// <summary>
12 12 /// Класс для преобразования экранированной строки JSON
13 13 /// </summary>
14 public class StringTranslator : Scanner {
14 public class StringTranslator : TextScanner<JSONGrammar.TokenType> {
15 15 static readonly char[] _escMap;
16 16 static readonly int[] _hexMap;
17 17
18 18 static StringTranslator() {
19 19 var chars = new char[] { 'b', 'f', 't', 'r', 'n', '\\', '/' };
20 20 var vals = new char[] { '\b', '\f', '\t', '\r', '\n', '\\', '/' };
21 21
22 22 _escMap = new char[chars.Max() + 1];
23 23
24 24 for (int i = 0; i < chars.Length; i++)
25 25 _escMap[chars[i]] = vals[i];
26 26
27 27 var hexs = new char[] { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f', 'A', 'B', 'C', 'D', 'E', 'F' };
28 28 var ints = new int[] { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 10, 11, 12, 13, 14, 15 };
29 29
30 30 _hexMap = new int[hexs.Max() + 1];
31 31
32 32 for (int i = 0; i < hexs.Length; i++)
33 33 _hexMap[hexs[i]] = ints[i];
34 34
35 35 }
36 36
37 public StringTranslator()
38 : base(JSONGrammar.Instance.JsonStringDFA.States, JSONGrammar.Instance.JsonStringDFA.Alphabet.GetTranslationMap()) {
37 public StringTranslator() {
39 38 }
40 39
41 40 public string Translate(string data) {
42 41 Safe.ArgumentNotNull(data, "data");
43 42 return Translate(data.ToCharArray());
44 43 }
45 44
46 45 public string Translate(char[] data) {
47 46 Safe.ArgumentNotNull(data, "data");
48 47 return Translate(data, data.Length);
49 48 }
50 49
51 50 public string Translate(char[] data, int length) {
52 51 Safe.ArgumentNotNull(data, "data");
53 52 Safe.ArgumentInRange(length, 0, data.Length, "length");
54 53
55 54 var translated = new char[length];
56 55
57 56 Feed(data,length);
58 57
59 58 int pos = 0;
60 59
61 60 while (ReadTokenInternal()) {
62 switch ((JSONGrammar.TokenType)TokenTags[0]) {
61 switch ((JSONGrammar.TokenType)Tags[0]) {
63 62 case JSONGrammar.TokenType.UnescapedChar:
64 63 Array.Copy(m_buffer,m_tokenOffset,translated,pos,m_tokenLen);
65 64 pos += m_tokenLen;
66 65 break;
67 66 case JSONGrammar.TokenType.EscapedChar:
68 67 translated[pos] = _escMap[m_buffer[m_tokenOffset + 1]];
69 68 pos++;
70 69 break;
71 70 case JSONGrammar.TokenType.EscapedUnicode:
72 71 translated[pos] = TranslateHexUnicode(m_buffer,m_tokenOffset + 2);
73 72 pos++;
74 73 break;
75 74 }
76 75 }
77 76
78 77 return new String(translated, 0, pos);
79 78 }
80 79
81 80 internal static char TranslateEscapedChar(char symbol) {
82 81 return _escMap[symbol];
83 82 }
84 83
85 84 internal static char TranslateHexUnicode(char[] symbols, int offset) {
86 85 Debug.Assert(symbols != null);
87 86 Debug.Assert(symbols.Length - offset >= 4);
88 87
89 88 int value = (_hexMap[symbols[offset]] << 12)
90 89 | (_hexMap[symbols[offset + 1]] << 8)
91 90 | (_hexMap[symbols[offset + 2]] << 4)
92 91 | (_hexMap[symbols[offset + 3]]);
93 92 return (char)value;
94 93 }
95 94 }
96 95 }
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@@ -1,53 +1,149
1 1 using System;
2 2 using Implab.Components;
3 3 using Implab.Automaton.RegularExpressions;
4 4 using System.Diagnostics;
5 5 using Implab.Automaton;
6 using System.IO;
7 using System.Text;
6 8
7 9 namespace Implab.Formats {
8 public abstract class TextScanner<TTag> : Disposable {
10 public abstract class TextScanner : Disposable {
11 readonly int m_bufferMax;
12 readonly int m_chunkSize;
9 13
10 int m_maxSymbol;
11 int[] m_symbolMap;
12
13 readonly char[] m_buffer;
14 char[] m_buffer;
14 15 int m_bufferOffset;
15 16 int m_bufferSize;
17 int m_tokenOffset;
16 18 int m_tokenLength;
17 19
18 TTag[] m_tags;
20 /// <summary>
21 /// Initializes a new instance of the <see cref="Implab.Formats.TextScanner`1"/> class.
22 /// </summary>
23 /// <param name="bufferMax">Buffer max.</param>
24 /// <param name="chunkSize">Chunk size.</param>
25 protected TextScanner(int bufferMax, int chunkSize) {
26 Debug.Assert(m_chunkSize <= m_bufferMax);
27
28 m_bufferMax = bufferMax;
29 m_chunkSize = chunkSize;
30 }
19 31
20 protected bool ReadTokenInternal(DFAStateDescriptor<TTag>[] dfa, int state) {
21 Debug.Assert(dfa != null);
32 /// <summary>
33 /// Initializes a new instance of the <see cref="Implab.Formats.TextScanner`1"/> class.
34 /// </summary>
35 /// <param name="buffer">Buffer.</param>
36 protected TextScanner(char[] buffer) {
37 if (buffer != null) {
38 m_buffer = buffer;
39 m_bufferSize = buffer.Length;
40 }
41 }
42
43 /// <summary>
44 /// (hungry) Reads the next token.
45 /// </summary>
46 /// <returns><c>true</c>, if token internal was read, <c>false</c> if there is no more tokens in the stream.</returns>
47 /// <param name="dfa">The transition map for the automaton</param>
48 /// <param name="final">Final states of the automaton.</param>
49 /// <param name="tags">Tags.</param>
50 /// <param name="state">The initial state for the automaton.</param>
51 internal bool ReadToken<TTag>(int[,] dfa, int[] final, TTag[][] tags, int state, int[] alphabet, out TTag[] tag) {
52 Safe.ArgumentNotNull();
53 m_tokenLength = 0;
54
55 var maxSymbol = alphabet.Length - 1;
22 56
23 57 do {
24 for (var pos = m_bufferOffset; pos < m_bufferSize; pos++) {
58 // after the next chunk is read the offset in the buffer may change
59 int pos = m_bufferOffset + m_tokenLength;
60
61 while(pos < m_bufferSize) {
25 62 var ch = m_buffer[pos];
26 state = dfa[state].transitions[m_symbolMap[ch > m_maxSymbol ? m_maxSymbol : ch]];
63
64 state = dfa[state,ch > maxSymbol ? DFAConst.UNCLASSIFIED_INPUT : alphabet[ch]];
27 65 if (state == DFAConst.UNREACHABLE_STATE)
28 66 break;
67
68 pos++;
29 69 }
30 } while (Feed());
70
71 m_tokenLength = pos - m_bufferOffset;
72 } while (state != DFAConst.UNREACHABLE_STATE && Feed());
73
74 m_tokenOffset = m_bufferOffset;
75 m_bufferOffset += m_tokenLength;
31 76
32 if (dfa[state].final) {
77 if (final[state]) {
78 tag = tags[state];
79 return true;
80 } else {
81 if (m_bufferOffset == m_bufferSize) {
82 if (m_tokenLength == 0) //EOF
83 return false;
84
85 throw new ParserException();
86 }
87 throw new ParserException(String.Format("Unexpected symbol '{0}'", m_buffer[m_bufferOffset]));
33 88
34 89 }
90 }
35 91
92 protected void Feed(char[] buffer, int offset, int length) {
93 m_buffer = buffer;
94 m_bufferOffset = offset;
95 m_bufferSize = offset + length;
36 96 }
37 97
38 bool Feed() {
98 protected bool Feed() {
99 if (m_chunkSize <= 0)
100 return false;
101
102 if (m_buffer != null) {
103 var free = m_buffer.Length - m_bufferSize;
104
105 if (free < m_chunkSize) {
106 free += m_chunkSize;
107 var used = m_bufferSize - m_bufferOffset;
108 var size = used + free;
109
110 if (size > m_bufferMax)
111 throw new ParserException(String.Format("The buffer limit ({0} Kb) is reached"), m_bufferMax/1024);
112
113 var temp = new char[size];
39 114
115 var read = Read(temp, used, m_chunkSize);
116 if (read == 0)
117 return false;
118
119 Array.Copy(m_buffer, m_bufferOffset, temp, 0, used);
120
121 m_bufferOffset = 0;
122 m_bufferSize = used + read;
123 m_buffer = temp;
124 }
125 } else {
126 Debug.Assert(m_bufferOffset == 0);
127 m_buffer = new char[m_chunkSize];
128 m_bufferSize = Read(m_buffer, 0, m_chunkSize);
129 return (m_bufferSize != 0);
130 }
40 131 }
41 132
42 133 protected abstract int Read(char[] buffer, int offset, int size);
43 134
44 protected TTag[] Tags {
45 get {
46 return m_tags;
47 }
135 public string GetTokenValue() {
136 return new String(m_buffer, m_tokenOffset, m_tokenLength);
48 137 }
49 138
139 public void CopyTokenTo(char[] buffer, int offset) {
140 m_buffer.CopyTo(buffer, offset);
141 }
142
143 public void CopyTokenTo(StringBuilder sb) {
144 sb.Append(m_buffer, m_tokenOffset, m_tokenLength);
145 }
50 146
51 147 }
52 148 }
53 149
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@@ -1,274 +1,273
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273 272 </ItemGroup>
274 273 </Project> No newline at end of file
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