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view.c 9.9 KB

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  1. /*
  2. * view.c
  3. *
  4. * This file provides the implementation of a view class
  5. */
  6. #include "private.h"
  7. #include "clish/variable.h"
  8. #include "lub/argv.h"
  9. #include "lub/string.h"
  10. #include "lub/ctype.h"
  11. #include <assert.h>
  12. #include <stdlib.h>
  13. #include <string.h>
  14. #include <stdio.h>
  15. /*---------------------------------------------------------
  16. * PRIVATE META FUNCTIONS
  17. *--------------------------------------------------------- */
  18. int clish_view_bt_compare(const void *clientnode, const void *clientkey)
  19. {
  20. const clish_view_t *this = clientnode;
  21. const char *key = clientkey;
  22. return strcmp(this->name, key);
  23. }
  24. /*-------------------------------------------------------- */
  25. void clish_view_bt_getkey(const void *clientnode, lub_bintree_key_t * key)
  26. {
  27. const clish_view_t *this = clientnode;
  28. /* fill out the opaque key */
  29. strcpy((char *)key, this->name);
  30. }
  31. /*---------------------------------------------------------
  32. * PRIVATE METHODS
  33. *--------------------------------------------------------- */
  34. static void
  35. clish_view_init(clish_view_t * this, const char *name, const char *prompt)
  36. {
  37. /* set up defaults */
  38. this->name = lub_string_dup(name);
  39. this->prompt = NULL;
  40. this->nspacec = 0;
  41. this->nspacev = NULL;
  42. this->depth = 0;
  43. this->restore = CLISH_RESTORE_NONE;
  44. /* Be a good binary tree citizen */
  45. lub_bintree_node_init(&this->bt_node);
  46. /* initialise the tree of commands for this view */
  47. lub_bintree_init(&this->tree,
  48. clish_command_bt_offset(),
  49. clish_command_bt_compare, clish_command_bt_getkey);
  50. /* set up the defaults */
  51. clish_view__set_prompt(this, prompt);
  52. }
  53. /*--------------------------------------------------------- */
  54. static void clish_view_fini(clish_view_t * this)
  55. {
  56. clish_command_t *cmd;
  57. unsigned i;
  58. /* delete each command held by this view */
  59. while ((cmd = lub_bintree_findfirst(&this->tree))) {
  60. /* remove the command from the tree */
  61. lub_bintree_remove(&this->tree, cmd);
  62. /* release the instance */
  63. clish_command_delete(cmd);
  64. }
  65. /* free our memory */
  66. lub_string_free(this->name);
  67. this->name = NULL;
  68. lub_string_free(this->prompt);
  69. this->prompt = NULL;
  70. /* finalize each of the namespace instances */
  71. for (i = 0; i < this->nspacec; i++) {
  72. clish_nspace_delete(this->nspacev[i]);
  73. }
  74. /* free the namespace vector */
  75. free(this->nspacev);
  76. this->nspacec = 0;
  77. this->nspacev = NULL;
  78. }
  79. /*---------------------------------------------------------
  80. * PUBLIC META FUNCTIONS
  81. *--------------------------------------------------------- */
  82. size_t clish_view_bt_offset(void)
  83. {
  84. return offsetof(clish_view_t, bt_node);
  85. }
  86. /*--------------------------------------------------------- */
  87. clish_view_t *clish_view_new(const char *name, const char *prompt)
  88. {
  89. clish_view_t *this = malloc(sizeof(clish_view_t));
  90. if (this) {
  91. clish_view_init(this, name, prompt);
  92. }
  93. return this;
  94. }
  95. /*---------------------------------------------------------
  96. * PUBLIC METHODS
  97. *--------------------------------------------------------- */
  98. void clish_view_delete(clish_view_t * this)
  99. {
  100. clish_view_fini(this);
  101. free(this);
  102. }
  103. /*--------------------------------------------------------- */
  104. clish_command_t *clish_view_new_command(clish_view_t * this,
  105. const char *name, const char *help)
  106. {
  107. /* allocate the memory for a new parameter definition */
  108. clish_command_t *cmd = clish_command_new(name, help);
  109. assert(cmd);
  110. /* if this is a command other than the startup command... */
  111. if (NULL != help) {
  112. /* ...insert it into the binary tree for this view */
  113. if (-1 == lub_bintree_insert(&this->tree, cmd)) {
  114. /* inserting a duplicate command is bad */
  115. clish_command_delete(cmd);
  116. cmd = NULL;
  117. }
  118. }
  119. return cmd;
  120. }
  121. /*--------------------------------------------------------- */
  122. /* This method identifies the command (if any) which provides
  123. * the longest match with the specified line of text.
  124. *
  125. * NB this comparison is case insensitive.
  126. *
  127. * this - the view instance upon which to operate
  128. * line - the command line to analyse
  129. */
  130. clish_command_t *clish_view_resolve_prefix(clish_view_t * this,
  131. const char *line, bool_t inherit)
  132. {
  133. clish_command_t *result = NULL, *cmd;
  134. char *buffer = NULL;
  135. lub_argv_t *argv;
  136. unsigned i;
  137. /* create a vector of arguments */
  138. argv = lub_argv_new(line, 0);
  139. for (i = 0; i < lub_argv__get_count(argv); i++) {
  140. /* set our buffer to be that of the first "i" arguments */
  141. lub_string_cat(&buffer, lub_argv__get_arg(argv, i));
  142. /* set the result to the longest match */
  143. cmd = clish_view_find_command(this, buffer, inherit);
  144. if (NULL == cmd) {
  145. /* job done */
  146. break;
  147. }
  148. result = cmd;
  149. /* ready for the next word */
  150. lub_string_cat(&buffer, " ");
  151. }
  152. /* free up our dynamic storage */
  153. lub_string_free(buffer);
  154. lub_argv_delete(argv);
  155. return result;
  156. }
  157. /*--------------------------------------------------------- */
  158. clish_command_t *clish_view_resolve_command(clish_view_t * this,
  159. const char *line, bool_t inherit)
  160. {
  161. clish_command_t *result = clish_view_resolve_prefix(this, line, inherit);
  162. if (NULL != result) {
  163. char *action = clish_command__get_action(result, NULL, NULL);
  164. if ((NULL == action) &&
  165. (NULL == clish_command__get_builtin(result)) &&
  166. (CLISH_CONFIG_NONE == clish_command__get_cfg_op(result)) &&
  167. (NULL == clish_command__get_view(result))) {
  168. /* if this doesn't do anything we've
  169. * not resolved a command
  170. */
  171. result = NULL;
  172. }
  173. /* cleanup */
  174. lub_string_free(action);
  175. }
  176. return result;
  177. }
  178. /*--------------------------------------------------------- */
  179. clish_command_t *clish_view_find_command(clish_view_t * this, const char *name, bool_t inherit)
  180. {
  181. clish_command_t *cmd, *result;
  182. clish_nspace_t *nspace;
  183. clish_view_t *view;
  184. unsigned cnt = clish_view__get_nspace_count(this);
  185. int i;
  186. /* Search the current view */
  187. result = lub_bintree_find(&this->tree, name);
  188. if (!inherit)
  189. return result;
  190. for (i = cnt - 1; i >= 0; i--) {
  191. nspace = clish_view__get_nspace(this, i);
  192. cmd = clish_nspace_find_command(nspace, name);
  193. /* choose the longest match */
  194. result = clish_command_choose_longest(result, cmd);
  195. }
  196. return result;
  197. }
  198. /*--------------------------------------------------------- */
  199. static const clish_command_t *find_next_completion(clish_view_t * this,
  200. const char *iter_cmd, const char *line)
  201. {
  202. clish_command_t *cmd;
  203. const char *name = "";
  204. lub_argv_t *largv;
  205. unsigned words;
  206. /* build an argument vector for the line */
  207. largv = lub_argv_new(line, 0);
  208. words = lub_argv__get_count(largv);
  209. if (!*line || lub_ctype_isspace(line[strlen(line) - 1])) {
  210. /* account for trailing space */
  211. words++;
  212. }
  213. if (NULL != iter_cmd) {
  214. name = iter_cmd;
  215. }
  216. while ((cmd = lub_bintree_findnext(&this->tree, name))) {
  217. name = clish_command__get_name(cmd);
  218. if (words == lub_argv_wordcount(name)) {
  219. /* only bother with commands of which this line is a prefix */
  220. if (lub_string_nocasestr(name, line) == name) {
  221. /* this is a completion */
  222. break;
  223. }
  224. }
  225. }
  226. /* clean up the dynamic memory */
  227. lub_argv_delete(largv);
  228. return cmd;
  229. }
  230. /*--------------------------------------------------------- */
  231. const clish_command_t *clish_view_find_next_completion(clish_view_t * this,
  232. const char *iter_cmd, const char *line, clish_nspace_visibility_t field, bool_t inherit)
  233. {
  234. const clish_command_t *result, *cmd;
  235. clish_nspace_t *nspace;
  236. clish_view_t *view;
  237. unsigned cnt = clish_view__get_nspace_count(this);
  238. int i;
  239. /* ask local view for next command */
  240. result = find_next_completion(this, iter_cmd, line);
  241. if (!inherit)
  242. return result;
  243. /* ask the imported namespaces for next command */
  244. for (i = cnt - 1; i >= 0; i--) {
  245. nspace = clish_view__get_nspace(this, i);
  246. if (!clish_nspace__get_visibility(nspace, field))
  247. continue;
  248. cmd = clish_nspace_find_next_completion(nspace,
  249. iter_cmd, line, field);
  250. if (clish_command_diff(result, cmd) > 0)
  251. result = cmd;
  252. }
  253. return result;
  254. }
  255. /*--------------------------------------------------------- */
  256. void clish_view_insert_nspace(clish_view_t * this, clish_nspace_t * nspace)
  257. {
  258. size_t new_size = ((this->nspacec + 1) * sizeof(clish_nspace_t *));
  259. clish_nspace_t **tmp;
  260. /* resize the namespace vector */
  261. tmp = realloc(this->nspacev, new_size);
  262. assert(tmp);
  263. this->nspacev = tmp;
  264. /* insert reference to the namespace */
  265. this->nspacev[this->nspacec++] = nspace;
  266. }
  267. /*---------------------------------------------------------
  268. * PUBLIC ATTRIBUTES
  269. *--------------------------------------------------------- */
  270. const char *clish_view__get_name(const clish_view_t * this)
  271. {
  272. return this->name;
  273. }
  274. /*--------------------------------------------------------- */
  275. void clish_view__set_prompt(clish_view_t * this, const char *prompt)
  276. {
  277. assert(NULL == this->prompt);
  278. this->prompt = lub_string_dup(prompt);
  279. }
  280. /*--------------------------------------------------------- */
  281. char *clish_view__get_prompt(const clish_view_t * this, const char *viewid)
  282. {
  283. return clish_variable_expand(this->prompt, viewid, NULL, NULL);
  284. }
  285. /*--------------------------------------------------------- */
  286. clish_nspace_t *clish_view__get_nspace(const clish_view_t * this,
  287. unsigned index)
  288. {
  289. clish_nspace_t *result = NULL;
  290. if (index < this->nspacec) {
  291. result = this->nspacev[index];
  292. }
  293. return result;
  294. }
  295. /*--------------------------------------------------------- */
  296. const unsigned clish_view__get_nspace_count(const clish_view_t * this)
  297. {
  298. return this->nspacec;
  299. }
  300. /*--------------------------------------------------------- */
  301. void clish_view__set_depth(clish_view_t * this, unsigned depth)
  302. {
  303. this->depth = depth;
  304. }
  305. /*--------------------------------------------------------- */
  306. unsigned clish_view__get_depth(const clish_view_t * this)
  307. {
  308. return this->depth;
  309. }
  310. /*--------------------------------------------------------- */
  311. void clish_view__set_restore(clish_view_t * this,
  312. clish_view_restore_t restore)
  313. {
  314. this->restore = restore;
  315. }
  316. /*--------------------------------------------------------- */
  317. clish_view_restore_t clish_view__get_restore(const clish_view_t * this)
  318. {
  319. return this->restore;
  320. }
  321. /*--------------------------------------------------------- */