SBJsonStreamParserState.m 7.9 KB

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  1. /*
  2. Copyright (c) 2010, Stig Brautaset.
  3. All rights reserved.
  4. Redistribution and use in source and binary forms, with or without
  5. modification, are permitted provided that the following conditions are
  6. met:
  7. Redistributions of source code must retain the above copyright
  8. notice, this list of conditions and the following disclaimer.
  9. Redistributions in binary form must reproduce the above copyright
  10. notice, this list of conditions and the following disclaimer in the
  11. documentation and/or other materials provided with the distribution.
  12. Neither the name of the the author nor the names of its contributors
  13. may be used to endorse or promote products derived from this software
  14. without specific prior written permission.
  15. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
  16. IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
  17. TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
  18. PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  19. HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  20. SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  21. LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  22. DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  23. THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  24. (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  25. OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  26. */
  27. #import "SBJsonStreamParserState.h"
  28. #import "SBJsonStreamParser.h"
  29. #define SINGLETON \
  30. + (id)sharedInstance { \
  31. static id state; \
  32. if (!state) state = [[self alloc] init]; \
  33. return state; \
  34. }
  35. @implementation SBJsonStreamParserState
  36. + (id)sharedInstance { return nil; }
  37. - (BOOL)parser:(SBJsonStreamParser*)parser shouldAcceptToken:(sbjson_token_t)token {
  38. return NO;
  39. }
  40. - (SBJsonStreamParserStatus)parserShouldReturn:(SBJsonStreamParser*)parser {
  41. return SBJsonStreamParserWaitingForData;
  42. }
  43. - (void)parser:(SBJsonStreamParser*)parser shouldTransitionTo:(sbjson_token_t)tok {}
  44. - (BOOL)needKey {
  45. return NO;
  46. }
  47. - (NSString*)name {
  48. return @"<aaiie!>";
  49. }
  50. - (BOOL)isError {
  51. return NO;
  52. }
  53. @end
  54. #pragma mark -
  55. @implementation SBJsonStreamParserStateStart
  56. SINGLETON
  57. - (BOOL)parser:(SBJsonStreamParser*)parser shouldAcceptToken:(sbjson_token_t)token {
  58. return token == sbjson_token_array_start || token == sbjson_token_object_start;
  59. }
  60. - (void)parser:(SBJsonStreamParser*)parser shouldTransitionTo:(sbjson_token_t)tok {
  61. SBJsonStreamParserState *state = nil;
  62. switch (tok) {
  63. case sbjson_token_array_start:
  64. state = [SBJsonStreamParserStateArrayStart sharedInstance];
  65. break;
  66. case sbjson_token_object_start:
  67. state = [SBJsonStreamParserStateObjectStart sharedInstance];
  68. break;
  69. case sbjson_token_array_end:
  70. case sbjson_token_object_end:
  71. if (parser.supportMultipleDocuments)
  72. state = parser.state;
  73. else
  74. state = [SBJsonStreamParserStateComplete sharedInstance];
  75. break;
  76. case sbjson_token_eof:
  77. return;
  78. default:
  79. state = [SBJsonStreamParserStateError sharedInstance];
  80. break;
  81. }
  82. parser.state = state;
  83. }
  84. - (NSString*)name { return @"before outer-most array or object"; }
  85. @end
  86. #pragma mark -
  87. @implementation SBJsonStreamParserStateComplete
  88. SINGLETON
  89. - (NSString*)name { return @"after outer-most array or object"; }
  90. - (SBJsonStreamParserStatus)parserShouldReturn:(SBJsonStreamParser*)parser {
  91. return SBJsonStreamParserComplete;
  92. }
  93. @end
  94. #pragma mark -
  95. @implementation SBJsonStreamParserStateError
  96. SINGLETON
  97. - (NSString*)name { return @"in error"; }
  98. - (SBJsonStreamParserStatus)parserShouldReturn:(SBJsonStreamParser*)parser {
  99. return SBJsonStreamParserError;
  100. }
  101. - (BOOL)isError {
  102. return YES;
  103. }
  104. @end
  105. #pragma mark -
  106. @implementation SBJsonStreamParserStateObjectStart
  107. SINGLETON
  108. - (NSString*)name { return @"at beginning of object"; }
  109. - (BOOL)parser:(SBJsonStreamParser*)parser shouldAcceptToken:(sbjson_token_t)token {
  110. switch (token) {
  111. case sbjson_token_object_end:
  112. case sbjson_token_string:
  113. return YES;
  114. break;
  115. default:
  116. return NO;
  117. break;
  118. }
  119. }
  120. - (void)parser:(SBJsonStreamParser*)parser shouldTransitionTo:(sbjson_token_t)tok {
  121. parser.state = [SBJsonStreamParserStateObjectGotKey sharedInstance];
  122. }
  123. - (BOOL)needKey {
  124. return YES;
  125. }
  126. @end
  127. #pragma mark -
  128. @implementation SBJsonStreamParserStateObjectGotKey
  129. SINGLETON
  130. - (NSString*)name { return @"after object key"; }
  131. - (BOOL)parser:(SBJsonStreamParser*)parser shouldAcceptToken:(sbjson_token_t)token {
  132. return token == sbjson_token_keyval_separator;
  133. }
  134. - (void)parser:(SBJsonStreamParser*)parser shouldTransitionTo:(sbjson_token_t)tok {
  135. parser.state = [SBJsonStreamParserStateObjectSeparator sharedInstance];
  136. }
  137. @end
  138. #pragma mark -
  139. @implementation SBJsonStreamParserStateObjectSeparator
  140. SINGLETON
  141. - (NSString*)name { return @"as object value"; }
  142. - (BOOL)parser:(SBJsonStreamParser*)parser shouldAcceptToken:(sbjson_token_t)token {
  143. switch (token) {
  144. case sbjson_token_object_start:
  145. case sbjson_token_array_start:
  146. case sbjson_token_true:
  147. case sbjson_token_false:
  148. case sbjson_token_null:
  149. case sbjson_token_number:
  150. case sbjson_token_string:
  151. return YES;
  152. break;
  153. default:
  154. return NO;
  155. break;
  156. }
  157. }
  158. - (void)parser:(SBJsonStreamParser*)parser shouldTransitionTo:(sbjson_token_t)tok {
  159. parser.state = [SBJsonStreamParserStateObjectGotValue sharedInstance];
  160. }
  161. @end
  162. #pragma mark -
  163. @implementation SBJsonStreamParserStateObjectGotValue
  164. SINGLETON
  165. - (NSString*)name { return @"after object value"; }
  166. - (BOOL)parser:(SBJsonStreamParser*)parser shouldAcceptToken:(sbjson_token_t)token {
  167. switch (token) {
  168. case sbjson_token_object_end:
  169. case sbjson_token_separator:
  170. return YES;
  171. break;
  172. default:
  173. return NO;
  174. break;
  175. }
  176. }
  177. - (void)parser:(SBJsonStreamParser*)parser shouldTransitionTo:(sbjson_token_t)tok {
  178. parser.state = [SBJsonStreamParserStateObjectNeedKey sharedInstance];
  179. }
  180. @end
  181. #pragma mark -
  182. @implementation SBJsonStreamParserStateObjectNeedKey
  183. SINGLETON
  184. - (NSString*)name { return @"in place of object key"; }
  185. - (BOOL)parser:(SBJsonStreamParser*)parser shouldAcceptToken:(sbjson_token_t)token {
  186. return sbjson_token_string == token;
  187. }
  188. - (void)parser:(SBJsonStreamParser*)parser shouldTransitionTo:(sbjson_token_t)tok {
  189. parser.state = [SBJsonStreamParserStateObjectGotKey sharedInstance];
  190. }
  191. - (BOOL)needKey {
  192. return YES;
  193. }
  194. @end
  195. #pragma mark -
  196. @implementation SBJsonStreamParserStateArrayStart
  197. SINGLETON
  198. - (NSString*)name { return @"at array start"; }
  199. - (BOOL)parser:(SBJsonStreamParser*)parser shouldAcceptToken:(sbjson_token_t)token {
  200. switch (token) {
  201. case sbjson_token_object_end:
  202. case sbjson_token_keyval_separator:
  203. case sbjson_token_separator:
  204. return NO;
  205. break;
  206. default:
  207. return YES;
  208. break;
  209. }
  210. }
  211. - (void)parser:(SBJsonStreamParser*)parser shouldTransitionTo:(sbjson_token_t)tok {
  212. parser.state = [SBJsonStreamParserStateArrayGotValue sharedInstance];
  213. }
  214. @end
  215. #pragma mark -
  216. @implementation SBJsonStreamParserStateArrayGotValue
  217. SINGLETON
  218. - (NSString*)name { return @"after array value"; }
  219. - (BOOL)parser:(SBJsonStreamParser*)parser shouldAcceptToken:(sbjson_token_t)token {
  220. return token == sbjson_token_array_end || token == sbjson_token_separator;
  221. }
  222. - (void)parser:(SBJsonStreamParser*)parser shouldTransitionTo:(sbjson_token_t)tok {
  223. if (tok == sbjson_token_separator)
  224. parser.state = [SBJsonStreamParserStateArrayNeedValue sharedInstance];
  225. }
  226. @end
  227. #pragma mark -
  228. @implementation SBJsonStreamParserStateArrayNeedValue
  229. SINGLETON
  230. - (NSString*)name { return @"as array value"; }
  231. - (BOOL)parser:(SBJsonStreamParser*)parser shouldAcceptToken:(sbjson_token_t)token {
  232. switch (token) {
  233. case sbjson_token_array_end:
  234. case sbjson_token_keyval_separator:
  235. case sbjson_token_object_end:
  236. case sbjson_token_separator:
  237. return NO;
  238. break;
  239. default:
  240. return YES;
  241. break;
  242. }
  243. }
  244. - (void)parser:(SBJsonStreamParser*)parser shouldTransitionTo:(sbjson_token_t)tok {
  245. parser.state = [SBJsonStreamParserStateArrayGotValue sharedInstance];
  246. }
  247. @end