root / Assets / Plugins / LitJson / JsonReader.cs @ 11:01dde4258840
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| 1 | #region Header |
|---|---|
| 2 | /** |
| 3 | * JsonReader.cs |
| 4 | * Stream-like access to JSON text. |
| 5 | * |
| 6 | * The authors disclaim copyright to this source code. For more details, see |
| 7 | * the COPYING file included with this distribution. |
| 8 | **/ |
| 9 | #endregion |
| 10 | |
| 11 | |
| 12 | using System; |
| 13 | using System.Collections.Generic; |
| 14 | using System.IO; |
| 15 | using System.Text; |
| 16 | |
| 17 | |
| 18 | namespace LitJson |
| 19 | {
|
| 20 | public enum JsonToken |
| 21 | {
|
| 22 | None, |
| 23 | |
| 24 | ObjectStart, |
| 25 | PropertyName, |
| 26 | ObjectEnd, |
| 27 | |
| 28 | ArrayStart, |
| 29 | ArrayEnd, |
| 30 | |
| 31 | Int, |
| 32 | Long, |
| 33 | Double, |
| 34 | |
| 35 | String, |
| 36 | |
| 37 | Boolean, |
| 38 | Null |
| 39 | } |
| 40 | |
| 41 | |
| 42 | public class JsonReader |
| 43 | {
|
| 44 | #region Fields |
| 45 | private static IDictionary<int, IDictionary<int, int[]>> parse_table; |
| 46 | |
| 47 | private Stack<int> automaton_stack; |
| 48 | private int current_input; |
| 49 | private int current_symbol; |
| 50 | private bool end_of_json; |
| 51 | private bool end_of_input; |
| 52 | private Lexer lexer; |
| 53 | private bool parser_in_string; |
| 54 | private bool parser_return; |
| 55 | private bool read_started; |
| 56 | private TextReader reader; |
| 57 | private bool reader_is_owned; |
| 58 | private bool skip_non_members; |
| 59 | private object token_value; |
| 60 | private JsonToken token; |
| 61 | #endregion |
| 62 | |
| 63 | |
| 64 | #region Public Properties |
| 65 | public bool AllowComments {
|
| 66 | get { return lexer.AllowComments; }
|
| 67 | set { lexer.AllowComments = value; }
|
| 68 | } |
| 69 | |
| 70 | public bool AllowSingleQuotedStrings {
|
| 71 | get { return lexer.AllowSingleQuotedStrings; }
|
| 72 | set { lexer.AllowSingleQuotedStrings = value; }
|
| 73 | } |
| 74 | |
| 75 | public bool SkipNonMembers {
|
| 76 | get { return skip_non_members; }
|
| 77 | set { skip_non_members = value; }
|
| 78 | } |
| 79 | |
| 80 | public bool EndOfInput {
|
| 81 | get { return end_of_input; }
|
| 82 | } |
| 83 | |
| 84 | public bool EndOfJson {
|
| 85 | get { return end_of_json; }
|
| 86 | } |
| 87 | |
| 88 | public JsonToken Token {
|
| 89 | get { return token; }
|
| 90 | } |
| 91 | |
| 92 | public object Value {
|
| 93 | get { return token_value; }
|
| 94 | } |
| 95 | #endregion |
| 96 | |
| 97 | |
| 98 | #region Constructors |
| 99 | static JsonReader () |
| 100 | {
|
| 101 | PopulateParseTable (); |
| 102 | } |
| 103 | |
| 104 | public JsonReader (string json_text) : |
| 105 | this (new StringReader (json_text), true) |
| 106 | {
|
| 107 | } |
| 108 | |
| 109 | public JsonReader (TextReader reader) : |
| 110 | this (reader, false) |
| 111 | {
|
| 112 | } |
| 113 | |
| 114 | private JsonReader (TextReader reader, bool owned) |
| 115 | {
|
| 116 | if (reader == null) |
| 117 | throw new ArgumentNullException ("reader");
|
| 118 | |
| 119 | parser_in_string = false; |
| 120 | parser_return = false; |
| 121 | |
| 122 | read_started = false; |
| 123 | automaton_stack = new Stack<int> (); |
| 124 | automaton_stack.Push ((int) ParserToken.End); |
| 125 | automaton_stack.Push ((int) ParserToken.Text); |
| 126 | |
| 127 | lexer = new Lexer (reader); |
| 128 | |
| 129 | end_of_input = false; |
| 130 | end_of_json = false; |
| 131 | |
| 132 | skip_non_members = true; |
| 133 | |
| 134 | this.reader = reader; |
| 135 | reader_is_owned = owned; |
| 136 | } |
| 137 | #endregion |
| 138 | |
| 139 | |
| 140 | #region Static Methods |
| 141 | private static void PopulateParseTable () |
| 142 | {
|
| 143 | // See section A.2. of the manual for details |
| 144 | parse_table = new Dictionary<int, IDictionary<int, int[]>> (); |
| 145 | |
| 146 | TableAddRow (ParserToken.Array); |
| 147 | TableAddCol (ParserToken.Array, '[', |
| 148 | '[', |
| 149 | (int) ParserToken.ArrayPrime); |
| 150 | |
| 151 | TableAddRow (ParserToken.ArrayPrime); |
| 152 | TableAddCol (ParserToken.ArrayPrime, '"', |
| 153 | (int) ParserToken.Value, |
| 154 | |
| 155 | (int) ParserToken.ValueRest, |
| 156 | ']'); |
| 157 | TableAddCol (ParserToken.ArrayPrime, '[', |
| 158 | (int) ParserToken.Value, |
| 159 | (int) ParserToken.ValueRest, |
| 160 | ']'); |
| 161 | TableAddCol (ParserToken.ArrayPrime, ']', |
| 162 | ']'); |
| 163 | TableAddCol (ParserToken.ArrayPrime, '{',
|
| 164 | (int) ParserToken.Value, |
| 165 | (int) ParserToken.ValueRest, |
| 166 | ']'); |
| 167 | TableAddCol (ParserToken.ArrayPrime, (int) ParserToken.Number, |
| 168 | (int) ParserToken.Value, |
| 169 | (int) ParserToken.ValueRest, |
| 170 | ']'); |
| 171 | TableAddCol (ParserToken.ArrayPrime, (int) ParserToken.True, |
| 172 | (int) ParserToken.Value, |
| 173 | (int) ParserToken.ValueRest, |
| 174 | ']'); |
| 175 | TableAddCol (ParserToken.ArrayPrime, (int) ParserToken.False, |
| 176 | (int) ParserToken.Value, |
| 177 | (int) ParserToken.ValueRest, |
| 178 | ']'); |
| 179 | TableAddCol (ParserToken.ArrayPrime, (int) ParserToken.Null, |
| 180 | (int) ParserToken.Value, |
| 181 | (int) ParserToken.ValueRest, |
| 182 | ']'); |
| 183 | |
| 184 | TableAddRow (ParserToken.Object); |
| 185 | TableAddCol (ParserToken.Object, '{',
|
| 186 | '{',
|
| 187 | (int) ParserToken.ObjectPrime); |
| 188 | |
| 189 | TableAddRow (ParserToken.ObjectPrime); |
| 190 | TableAddCol (ParserToken.ObjectPrime, '"', |
| 191 | (int) ParserToken.Pair, |
| 192 | (int) ParserToken.PairRest, |
| 193 | '}'); |
| 194 | TableAddCol (ParserToken.ObjectPrime, '}', |
| 195 | '}'); |
| 196 | |
| 197 | TableAddRow (ParserToken.Pair); |
| 198 | TableAddCol (ParserToken.Pair, '"', |
| 199 | (int) ParserToken.String, |
| 200 | ':', |
| 201 | (int) ParserToken.Value); |
| 202 | |
| 203 | TableAddRow (ParserToken.PairRest); |
| 204 | TableAddCol (ParserToken.PairRest, ',', |
| 205 | ',', |
| 206 | (int) ParserToken.Pair, |
| 207 | (int) ParserToken.PairRest); |
| 208 | TableAddCol (ParserToken.PairRest, '}', |
| 209 | (int) ParserToken.Epsilon); |
| 210 | |
| 211 | TableAddRow (ParserToken.String); |
| 212 | TableAddCol (ParserToken.String, '"', |
| 213 | '"', |
| 214 | (int) ParserToken.CharSeq, |
| 215 | '"'); |
| 216 | |
| 217 | TableAddRow (ParserToken.Text); |
| 218 | TableAddCol (ParserToken.Text, '[', |
| 219 | (int) ParserToken.Array); |
| 220 | TableAddCol (ParserToken.Text, '{',
|
| 221 | (int) ParserToken.Object); |
| 222 | |
| 223 | TableAddRow (ParserToken.Value); |
| 224 | TableAddCol (ParserToken.Value, '"', |
| 225 | (int) ParserToken.String); |
| 226 | TableAddCol (ParserToken.Value, '[', |
| 227 | (int) ParserToken.Array); |
| 228 | TableAddCol (ParserToken.Value, '{',
|
| 229 | (int) ParserToken.Object); |
| 230 | TableAddCol (ParserToken.Value, (int) ParserToken.Number, |
| 231 | (int) ParserToken.Number); |
| 232 | TableAddCol (ParserToken.Value, (int) ParserToken.True, |
| 233 | (int) ParserToken.True); |
| 234 | TableAddCol (ParserToken.Value, (int) ParserToken.False, |
| 235 | (int) ParserToken.False); |
| 236 | TableAddCol (ParserToken.Value, (int) ParserToken.Null, |
| 237 | (int) ParserToken.Null); |
| 238 | |
| 239 | TableAddRow (ParserToken.ValueRest); |
| 240 | TableAddCol (ParserToken.ValueRest, ',', |
| 241 | ',', |
| 242 | (int) ParserToken.Value, |
| 243 | (int) ParserToken.ValueRest); |
| 244 | TableAddCol (ParserToken.ValueRest, ']', |
| 245 | (int) ParserToken.Epsilon); |
| 246 | } |
| 247 | |
| 248 | private static void TableAddCol (ParserToken row, int col, |
| 249 | params int[] symbols) |
| 250 | {
|
| 251 | parse_table[(int) row].Add (col, symbols); |
| 252 | } |
| 253 | |
| 254 | private static void TableAddRow (ParserToken rule) |
| 255 | {
|
| 256 | parse_table.Add ((int) rule, new Dictionary<int, int[]> ()); |
| 257 | } |
| 258 | #endregion |
| 259 | |
| 260 | |
| 261 | #region Private Methods |
| 262 | private void ProcessNumber (string number) |
| 263 | {
|
| 264 | if (number.IndexOf ('.') != -1 ||
|
| 265 | number.IndexOf ('e') != -1 ||
|
| 266 | number.IndexOf ('E') != -1) {
|
| 267 | |
| 268 | double n_double; |
| 269 | if (Double.TryParse (number, out n_double)) {
|
| 270 | token = JsonToken.Double; |
| 271 | token_value = n_double; |
| 272 | |
| 273 | return; |
| 274 | } |
| 275 | } |
| 276 | |
| 277 | int n_int32; |
| 278 | if (Int32.TryParse (number, out n_int32)) {
|
| 279 | token = JsonToken.Int; |
| 280 | token_value = n_int32; |
| 281 | |
| 282 | return; |
| 283 | } |
| 284 | |
| 285 | long n_int64; |
| 286 | if (Int64.TryParse (number, out n_int64)) {
|
| 287 | token = JsonToken.Long; |
| 288 | token_value = n_int64; |
| 289 | |
| 290 | return; |
| 291 | } |
| 292 | |
| 293 | // Shouldn't happen, but just in case, return something |
| 294 | token = JsonToken.Int; |
| 295 | token_value = 0; |
| 296 | } |
| 297 | |
| 298 | private void ProcessSymbol () |
| 299 | {
|
| 300 | if (current_symbol == '[') {
|
| 301 | token = JsonToken.ArrayStart; |
| 302 | parser_return = true; |
| 303 | |
| 304 | } else if (current_symbol == ']') {
|
| 305 | token = JsonToken.ArrayEnd; |
| 306 | parser_return = true; |
| 307 | |
| 308 | } else if (current_symbol == '{') {
|
| 309 | token = JsonToken.ObjectStart; |
| 310 | parser_return = true; |
| 311 | |
| 312 | } else if (current_symbol == '}') {
|
| 313 | token = JsonToken.ObjectEnd; |
| 314 | parser_return = true; |
| 315 | |
| 316 | } else if (current_symbol == '"') {
|
| 317 | if (parser_in_string) {
|
| 318 | parser_in_string = false; |
| 319 | |
| 320 | parser_return = true; |
| 321 | |
| 322 | } else {
|
| 323 | if (token == JsonToken.None) |
| 324 | token = JsonToken.String; |
| 325 | |
| 326 | parser_in_string = true; |
| 327 | } |
| 328 | |
| 329 | } else if (current_symbol == (int) ParserToken.CharSeq) {
|
| 330 | token_value = lexer.StringValue; |
| 331 | |
| 332 | } else if (current_symbol == (int) ParserToken.False) {
|
| 333 | token = JsonToken.Boolean; |
| 334 | token_value = false; |
| 335 | parser_return = true; |
| 336 | |
| 337 | } else if (current_symbol == (int) ParserToken.Null) {
|
| 338 | token = JsonToken.Null; |
| 339 | parser_return = true; |
| 340 | |
| 341 | } else if (current_symbol == (int) ParserToken.Number) {
|
| 342 | ProcessNumber (lexer.StringValue); |
| 343 | |
| 344 | parser_return = true; |
| 345 | |
| 346 | } else if (current_symbol == (int) ParserToken.Pair) {
|
| 347 | token = JsonToken.PropertyName; |
| 348 | |
| 349 | } else if (current_symbol == (int) ParserToken.True) {
|
| 350 | token = JsonToken.Boolean; |
| 351 | token_value = true; |
| 352 | parser_return = true; |
| 353 | |
| 354 | } |
| 355 | } |
| 356 | |
| 357 | private bool ReadToken () |
| 358 | {
|
| 359 | if (end_of_input) |
| 360 | return false; |
| 361 | |
| 362 | lexer.NextToken (); |
| 363 | |
| 364 | if (lexer.EndOfInput) {
|
| 365 | Close (); |
| 366 | |
| 367 | return false; |
| 368 | } |
| 369 | |
| 370 | current_input = lexer.Token; |
| 371 | |
| 372 | return true; |
| 373 | } |
| 374 | #endregion |
| 375 | |
| 376 | |
| 377 | public void Close () |
| 378 | {
|
| 379 | if (end_of_input) |
| 380 | return; |
| 381 | |
| 382 | end_of_input = true; |
| 383 | end_of_json = true; |
| 384 | |
| 385 | if (reader_is_owned) |
| 386 | reader.Close (); |
| 387 | |
| 388 | reader = null; |
| 389 | } |
| 390 | |
| 391 | public bool Read () |
| 392 | {
|
| 393 | if (end_of_input) |
| 394 | return false; |
| 395 | |
| 396 | if (end_of_json) {
|
| 397 | end_of_json = false; |
| 398 | automaton_stack.Clear (); |
| 399 | automaton_stack.Push ((int) ParserToken.End); |
| 400 | automaton_stack.Push ((int) ParserToken.Text); |
| 401 | } |
| 402 | |
| 403 | parser_in_string = false; |
| 404 | parser_return = false; |
| 405 | |
| 406 | token = JsonToken.None; |
| 407 | token_value = null; |
| 408 | |
| 409 | if (! read_started) {
|
| 410 | read_started = true; |
| 411 | |
| 412 | if (! ReadToken ()) |
| 413 | return false; |
| 414 | } |
| 415 | |
| 416 | |
| 417 | int[] entry_symbols; |
| 418 | |
| 419 | while (true) {
|
| 420 | if (parser_return) {
|
| 421 | if (automaton_stack.Peek () == (int) ParserToken.End) |
| 422 | end_of_json = true; |
| 423 | |
| 424 | return true; |
| 425 | } |
| 426 | |
| 427 | current_symbol = automaton_stack.Pop (); |
| 428 | |
| 429 | ProcessSymbol (); |
| 430 | |
| 431 | if (current_symbol == current_input) {
|
| 432 | if (! ReadToken ()) {
|
| 433 | if (automaton_stack.Peek () != (int) ParserToken.End) |
| 434 | throw new JsonException ( |
| 435 | "Input doesn't evaluate to proper JSON text"); |
| 436 | |
| 437 | if (parser_return) |
| 438 | return true; |
| 439 | |
| 440 | return false; |
| 441 | } |
| 442 | |
| 443 | continue; |
| 444 | } |
| 445 | |
| 446 | try {
|
| 447 | |
| 448 | entry_symbols = |
| 449 | parse_table[current_symbol][current_input]; |
| 450 | |
| 451 | } catch (KeyNotFoundException e) {
|
| 452 | throw new JsonException ((ParserToken) current_input, e); |
| 453 | } |
| 454 | |
| 455 | if (entry_symbols[0] == (int) ParserToken.Epsilon) |
| 456 | continue; |
| 457 | |
| 458 | for (int i = entry_symbols.Length - 1; i >= 0; i--) |
| 459 | automaton_stack.Push (entry_symbols[i]); |
| 460 | } |
| 461 | } |
| 462 | |
| 463 | } |
| 464 | } |