Add screen.[ch] and unit tests

src/screen.c

@@ -0,0 +1,121 @@
+#include "screen.h"
+
+struct screen_t *screen_create(char *name, uint16_t x, uint16_t y, uint16_t w, uint16_t h) {
+  struct screen_t *screen = NULL;
+
+  screen = (struct screen_t *) calloc(1, sizeof(*screen));
+  if (!screen)
+    return NULL;
+  screen->x=x; 
+  screen->y=y; 
+  screen->w=w; 
+  screen->h=h; 
+  if (name)
+    screen->name=strdup(name);
+  SLIST_INIT(&screen->widget_entries);
+
+  return screen;
+}
+
+struct screen_t *screen_create_from_file(char *fn) {
+  char *json;
+  void *h = NULL;
+//  struct json_token key;
+  struct json_token val;
+  int idx;
+  struct screen_t *screen = NULL;
+  struct widget_t *widget = NULL;
+  int screen_x, screen_y, screen_w, screen_h;
+  char *screen_name = NULL;
+
+
+  json = json_fread(fn);
+  if (!json) {
+    LOG(LL_ERROR, ("Could not read file %s", fn));
+    goto exit;
+  }
+
+  if (json_scanf(json, strlen(json), "{x:%d,y:%d,w:%d,h:%d,name:%Q}", &screen_x, &screen_y, &screen_w, &screen_h, &screen_name) != 5) {
+    LOG(LL_ERROR, ("%s: Incomplete JSON: require 'x', 'y', 'w', 'h' and 'name' fields", fn));
+    screen=NULL; goto exit;
+  }
+  screen = screen_create(screen_name, screen_x, screen_y, screen_w, screen_h);
+  
+/*
+  // Traverse Object
+  while ((h = json_next_key(json, strlen(json), h, ".", &key, &val)) != NULL) {
+    printf("[%.*s] -> [%.*s]\n", key.len, key.ptr, val.len, val.ptr);
+  }
+
+*/
+
+  // Traverse Array
+  while ((h = json_next_elem(json, strlen(json), h, ".widgets", &idx, &val)) != NULL) {
+//    printf("[%d]: [%.*s]\n", idx, val.len, val.ptr);
+    if (val.len>0 && val.ptr) {
+      widget = widget_create_from_json(val.ptr);
+      if (!screen_widget_add(screen, widget)) {
+        LOG(LL_ERROR, ("Could not add widget to screen"));
+      }
+    }
+  }
+
+exit:
+  if (json) free(json);
+  if (screen_name) free(screen_name);
+  return screen;
+}
+
+void screen_destroy(struct screen_t **s) {
+  free(*s);
+  if ((*s)->name) free ((*s)->name);
+  *s = NULL;
+}
+
+bool screen_widget_add(struct screen_t *s, struct widget_t *w) {
+  struct widget_list_t *wl;
+
+  wl = (struct widget_list_t *) calloc(1, sizeof(*wl));
+  if (!wl) {
+    return false;
+  }
+  wl->widget = w;
+  SLIST_INSERT_HEAD(&s->widget_entries, wl, entries);
+  return true;
+}
+
+struct widget_t *screen_widget_add_from_file(struct screen_t *s, char *fn) {
+  struct widget_t *w;
+
+  w = widget_create_from_file(fn);
+  if (!w)
+    return NULL;
+  screen_widget_add(s, w);
+  return w;
+}
+
+bool screen_widget_destroy(struct screen_t *s, struct widget_t **w) {
+  struct widget_list_t *wl;
+
+  if (!s)
+    return false;
+  SLIST_FOREACH(wl, &s->widget_entries, entries) {
+    if (wl->widget == *w) {
+      SLIST_REMOVE(&s->widget_entries, wl, widget_list_t, entries);
+      widget_destroy(w);
+    }
+  }
+  return true;
+}
+
+uint16_t screen_get_num_widgets(struct screen_t *s) {
+  struct widget_list_t *wl;
+  uint16_t num = 0;
+
+  if (!s)
+    return 0;
+  SLIST_FOREACH(wl, &s->widget_entries, entries)
+    num++;
+  
+  return num;
+}