nspace.c 8.5 KB

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  1. /*
  2. * nspace.c
  3. *
  4. * This file provides the implementation of the "nspace" class
  5. */
  6. #include "private.h"
  7. #include "lub/string.h"
  8. #include <assert.h>
  9. #include <stdlib.h>
  10. #include <string.h>
  11. #include <stdio.h>
  12. #include <sys/types.h>
  13. #include <regex.h>
  14. /*---------------------------------------------------------
  15. * PRIVATE METHODS
  16. *--------------------------------------------------------- */
  17. static void clish_nspace_init(clish_nspace_t * this, clish_view_t * view)
  18. {
  19. this->view = view;
  20. /* set up defaults */
  21. this->prefix = NULL;
  22. this->help = BOOL_FALSE;
  23. this->completion = BOOL_TRUE;
  24. this->context_help = BOOL_FALSE;
  25. this->inherit = BOOL_TRUE;
  26. this->prefix_cmd = NULL;
  27. /* initialise the tree of commands links for this nspace */
  28. lub_bintree_init(&this->tree,
  29. clish_command_bt_offset(),
  30. clish_command_bt_compare, clish_command_bt_getkey);
  31. }
  32. /*--------------------------------------------------------- */
  33. static void clish_nspace_fini(clish_nspace_t * this)
  34. {
  35. clish_command_t *cmd;
  36. /* deallocate the memory for this instance */
  37. lub_string_free(this->prefix);
  38. this->prefix = NULL;
  39. /* delete each command link held by this nspace */
  40. while ((cmd = lub_bintree_findfirst(&this->tree))) {
  41. /* remove the command from the tree */
  42. lub_bintree_remove(&this->tree, cmd);
  43. /* release the instance */
  44. clish_command_delete(cmd);
  45. }
  46. /* Delete prefix pseudo-command */
  47. if (this->prefix_cmd) {
  48. clish_command_delete(this->prefix_cmd);
  49. this->prefix_cmd = NULL;
  50. }
  51. }
  52. /*--------------------------------------------------------- */
  53. clish_command_t * clish_nspace_create_prefix_cmd(clish_nspace_t * this,
  54. const char * name, const char * help)
  55. {
  56. if (this->prefix_cmd) {
  57. clish_command_delete(this->prefix_cmd);
  58. this->prefix_cmd = NULL;
  59. }
  60. return (this->prefix_cmd = clish_command_new(name, help));
  61. }
  62. /*--------------------------------------------------------- */
  63. static clish_command_t *clish_nspace_find_create_command(clish_nspace_t * this,
  64. const char *prefix, const clish_command_t * ref)
  65. {
  66. clish_command_t *cmd;
  67. char *name = NULL;
  68. assert(prefix);
  69. if (!ref) {
  70. assert(this->prefix_cmd);
  71. name = lub_string_dup(prefix);
  72. ref = this->prefix_cmd;
  73. } else {
  74. lub_string_catn(&name, prefix, strlen(prefix));
  75. lub_string_catn(&name, " ", 1);
  76. lub_string_catn(&name, clish_command__get_name(ref),
  77. strlen(clish_command__get_name(ref)));
  78. }
  79. /* The command is cached already */
  80. if (cmd = lub_bintree_find(&this->tree, name)) {
  81. free(name);
  82. return cmd;
  83. }
  84. cmd = clish_command_new_link(name, ref);
  85. free(name);
  86. assert(cmd);
  87. /* Insert command link into the tree */
  88. if (-1 == lub_bintree_insert(&this->tree, cmd)) {
  89. clish_command_delete(cmd);
  90. cmd = NULL;
  91. }
  92. return cmd;
  93. }
  94. /*---------------------------------------------------------
  95. * PUBLIC META FUNCTIONS
  96. *--------------------------------------------------------- */
  97. clish_nspace_t *clish_nspace_new(clish_view_t * view)
  98. {
  99. clish_nspace_t *this = malloc(sizeof(clish_nspace_t));
  100. if (this) {
  101. clish_nspace_init(this, view);
  102. }
  103. return this;
  104. }
  105. /*---------------------------------------------------------
  106. * PUBLIC METHODS
  107. *--------------------------------------------------------- */
  108. void clish_nspace_delete(clish_nspace_t * this)
  109. {
  110. clish_nspace_fini(this);
  111. free(this);
  112. }
  113. /*--------------------------------------------------------- */
  114. static const char *clish_nspace_after_prefix(const char *prefix,
  115. const char *line, char **real_prefix)
  116. {
  117. const char *in_line = NULL;
  118. regex_t regexp;
  119. regmatch_t pmatch[1];
  120. int res;
  121. if (!line)
  122. return NULL;
  123. /* Compile regular expression */
  124. regcomp(&regexp, prefix, REG_EXTENDED | REG_ICASE);
  125. res = regexec(&regexp, line, 1, pmatch, 0);
  126. regfree(&regexp);
  127. if (res || (-1 == pmatch[0].rm_so))
  128. return NULL;
  129. /* Empty match */
  130. if (pmatch[0].rm_so == pmatch[0].rm_eo)
  131. return NULL;
  132. in_line = line + pmatch[0].rm_eo;
  133. lub_string_catn(real_prefix, line + pmatch[0].rm_so,
  134. pmatch[0].rm_eo - pmatch[0].rm_so);
  135. return in_line;
  136. }
  137. /*--------------------------------------------------------- */
  138. clish_command_t *clish_nspace_find_command(clish_nspace_t * this, const char *name)
  139. {
  140. clish_command_t *cmd = NULL, *retval = NULL;
  141. clish_view_t *view = clish_nspace__get_view(this);
  142. const char *prefix = clish_nspace__get_prefix(this);
  143. const char *in_line;
  144. char *real_prefix = NULL;
  145. if (!prefix)
  146. return clish_view_find_command(view, name, this->inherit);
  147. if (!(in_line = clish_nspace_after_prefix(prefix, name, &real_prefix)))
  148. return NULL;
  149. /* If prefix is followed by space */
  150. if (in_line[0] == ' ')
  151. in_line++;
  152. if (in_line[0] != '\0') {
  153. cmd = clish_view_find_command(view, in_line, this->inherit);
  154. if (!cmd) {
  155. lub_string_free(real_prefix);
  156. return NULL;
  157. }
  158. }
  159. retval = clish_nspace_find_create_command(this, real_prefix, cmd);
  160. lub_string_free(real_prefix);
  161. return retval;
  162. }
  163. /*--------------------------------------------------------- */
  164. const clish_command_t *clish_nspace_find_next_completion(clish_nspace_t * this,
  165. const char *iter_cmd, const char *line,
  166. clish_nspace_visibility_t field)
  167. {
  168. const clish_command_t *cmd = NULL, *retval = NULL;
  169. clish_view_t *view = clish_nspace__get_view(this);
  170. const char *prefix = clish_nspace__get_prefix(this);
  171. const char *in_iter = "";
  172. const char *in_line;
  173. char *real_prefix = NULL;
  174. if (!prefix)
  175. return clish_view_find_next_completion(view, iter_cmd,
  176. line, field, this->inherit);
  177. if (!(in_line = clish_nspace_after_prefix(prefix, line, &real_prefix)))
  178. return NULL;
  179. if (in_line[0] != '\0') {
  180. /* If prefix is followed by space */
  181. if (in_line[0] == ' ')
  182. in_line++;
  183. if (iter_cmd &&
  184. (lub_string_nocasestr(iter_cmd, real_prefix) == iter_cmd) &&
  185. (lub_string_nocasecmp(iter_cmd, real_prefix)))
  186. in_iter = iter_cmd + strlen(real_prefix) + 1;
  187. cmd = clish_view_find_next_completion(view,
  188. in_iter, in_line, field, this->inherit);
  189. if (!cmd) {
  190. lub_string_free(real_prefix);
  191. return NULL;
  192. }
  193. }
  194. /* If prefix was already returned. */
  195. if (!cmd && iter_cmd && !lub_string_nocasecmp(iter_cmd, real_prefix)) {
  196. lub_string_free(real_prefix);
  197. return NULL;
  198. }
  199. retval = clish_nspace_find_create_command(this, real_prefix, cmd);
  200. lub_string_free(real_prefix);
  201. return retval;
  202. }
  203. /*---------------------------------------------------------
  204. * PUBLIC ATTRIBUTES
  205. *--------------------------------------------------------- */
  206. clish_view_t *clish_nspace__get_view(const clish_nspace_t * this)
  207. {
  208. return this->view;
  209. }
  210. /*--------------------------------------------------------- */
  211. void clish_nspace__set_prefix(clish_nspace_t * this, const char *prefix)
  212. {
  213. assert(NULL == this->prefix);
  214. this->prefix = lub_string_dup(prefix);
  215. }
  216. /*--------------------------------------------------------- */
  217. const char *clish_nspace__get_prefix(const clish_nspace_t * this)
  218. {
  219. return this->prefix;
  220. }
  221. /*--------------------------------------------------------- */
  222. void clish_nspace__set_help(clish_nspace_t * this, bool_t help)
  223. {
  224. this->help = help;
  225. }
  226. /*--------------------------------------------------------- */
  227. bool_t clish_nspace__get_help(const clish_nspace_t * this)
  228. {
  229. return this->help;
  230. }
  231. /*--------------------------------------------------------- */
  232. void clish_nspace__set_completion(clish_nspace_t * this, bool_t completion)
  233. {
  234. this->completion = completion;
  235. }
  236. /*--------------------------------------------------------- */
  237. bool_t clish_nspace__get_completion(const clish_nspace_t * this)
  238. {
  239. return this->completion;
  240. }
  241. /*--------------------------------------------------------- */
  242. void clish_nspace__set_context_help(clish_nspace_t * this, bool_t context_help)
  243. {
  244. this->context_help = context_help;
  245. }
  246. /*--------------------------------------------------------- */
  247. bool_t clish_nspace__get_context_help(const clish_nspace_t * this)
  248. {
  249. return this->context_help;
  250. }
  251. /*--------------------------------------------------------- */
  252. void clish_nspace__set_inherit(clish_nspace_t * this, bool_t inherit)
  253. {
  254. this->inherit = inherit;
  255. }
  256. /*--------------------------------------------------------- */
  257. bool_t clish_nspace__get_inherit(const clish_nspace_t * this)
  258. {
  259. return this->inherit;
  260. }
  261. /*--------------------------------------------------------- */
  262. bool_t
  263. clish_nspace__get_visibility(const clish_nspace_t * instance,
  264. clish_nspace_visibility_t field)
  265. {
  266. bool_t result = BOOL_FALSE;
  267. switch (field) {
  268. case CLISH_NSPACE_HELP:
  269. result = clish_nspace__get_help(instance);
  270. break;
  271. case CLISH_NSPACE_COMPLETION:
  272. result = clish_nspace__get_completion(instance);
  273. break;
  274. case CLISH_NSPACE_CHELP:
  275. result = clish_nspace__get_context_help(instance);
  276. break;
  277. }
  278. return result;
  279. }
  280. /*--------------------------------------------------------- */