import of version 0.1

git-svn-id: http://svn.metaparadigm.com/svn/json-c/trunk@2 327403b1-1117-474d-bef2-5cb71233fd97

json_object.c

@@ -0,0 +1,493 @@
+/*
+ * $Id: json_object.c,v 1.10 2004/08/07 03:12:43 mclark Exp $
+ *
+ * Copyright Metaparadigm Pte. Ltd. 2004.
+ * Michael Clark <michael@metaparadigm.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public (LGPL)
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details: http://www.gnu.org/
+ *
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "debug.h"
+#include "printbuf.h"
+#include "linkhash.h"
+#include "arraylist.h"
+#include "json_object.h"
+#include "json_object_private.h"
+
+
+/* #define REFCOUNT_DEBUG */
+
+char *json_number_chars = "0123456789.+-e";
+char *json_hex_chars = "0123456789abcdef";
+
+#ifdef REFCOUNT_DEBUG
+static char* json_type_name[] = {
+  "null",
+  "boolean",
+  "double",
+  "int",
+  "object",
+  "array",
+  "string",
+};
+#endif
+
+static void json_object_generic_delete(struct json_object* this);
+static struct json_object* json_object_new(enum json_type o_type);
+
+
+/* ref count debugging */
+
+#ifdef REFCOUNT_DEBUG
+
+static struct lh_table *json_object_table;
+
+static void json_object_init() __attribute__ ((constructor));
+static void json_object_init() {
+  mc_debug("json_object_init: creating object table\n");
+  json_object_table = lh_kptr_table_new(128, "json_object_table", NULL);
+}
+
+static void json_object_fini() __attribute__ ((destructor));
+static void json_object_fini() {
+  struct lh_entry *ent;
+  if(mc_get_debug() && json_object_table->count) {
+    mc_debug("json_object_fini: %d referenced objects at exit\n",
+	     json_object_table->count);
+    lh_foreach(json_object_table, ent) {
+      struct json_object* obj = (struct json_object*)ent->v;
+      mc_debug("\t%s:%p\n", json_type_name[obj->o_type], obj);
+    }
+  }
+  mc_debug("json_object_fini: freeing object table\n");
+  lh_table_free(json_object_table);
+}
+#endif
+
+
+/* string escaping */
+
+static int json_escape_str(struct printbuf *pb, char *str)
+{
+  int pos = 0, start_offset = 0;
+  char c;
+  do {
+    c = str[pos];
+    switch(c) {
+    case '\b':
+    case '\n':
+    case '\r':
+    case '\t':
+      if(pos - start_offset > 0)
+	printbuf_memappend(pb, str + start_offset, pos - start_offset);
+      if(c == '\b') printbuf_memappend(pb, "\\b", 2);
+      else if(c == '\n') printbuf_memappend(pb, "\\n", 2);
+      else if(c == '\r') printbuf_memappend(pb, "\\r", 2);
+      else if(c == '\t') printbuf_memappend(pb, "\\t", 2);
+      start_offset = ++pos;
+      break;
+    default:
+      if(c && c < ' ') {
+	if(pos - start_offset > 0)
+	  printbuf_memappend(pb, str + start_offset, pos - start_offset);
+	sprintbuf(pb, "\\u00%c%c",
+		  json_hex_chars[c >> 4],
+		  json_hex_chars[c & 0xf]);
+	start_offset = ++pos;
+      } else if(c) pos++;
+    }
+  } while(c);
+  if(pos - start_offset > 0)
+    printbuf_memappend(pb, str + start_offset, pos - start_offset);
+  return 0;
+}
+
+
+/* reference counting */
+
+extern struct json_object* json_object_get(struct json_object *this)
+{
+  if(this) {
+    this->_ref_count++;
+  }
+  return this;
+}
+
+extern void json_object_put(struct json_object *this)
+{
+  if(this) {
+    this->_ref_count--;
+    if(!this->_ref_count) this->_delete(this);
+  }
+}
+
+
+/* generic object construction and destruction parts */
+
+static void json_object_generic_delete(struct json_object* this)
+{
+#ifdef REFCOUNT_DEBUG
+  mc_debug("json_object_delete_%s: %p\n",
+	   json_type_name[this->o_type], this);
+  lh_table_delete(json_object_table, this);
+#endif
+  printbuf_free(this->_pb);
+  free(this);
+}
+
+static struct json_object* json_object_new(enum json_type o_type)
+{
+  struct json_object *this = calloc(sizeof(struct json_object), 1);
+  if(!this) return NULL;
+  this->o_type = o_type;
+  this->_ref_count = 1;
+  this->_delete = &json_object_generic_delete;
+#ifdef REFCOUNT_DEBUG
+  lh_table_insert(json_object_table, this, this);
+  mc_debug("json_object_new_%s: %p\n", json_type_name[this->o_type], this);
+#endif
+  return this;
+}
+
+
+/* type checking functions */
+
+int json_object_is_type(struct json_object *this, enum json_type type)
+{
+  return (this->o_type == type);
+}
+
+enum json_type json_object_get_type(struct json_object *this)
+{
+  return this->o_type;
+}
+
+
+/* json_object_to_json_string */
+
+char* json_object_to_json_string(struct json_object *this)
+{
+  if(!this) return "null";
+  if(!this->_pb) {
+    if(!(this->_pb = printbuf_new())) return NULL;
+  } else {
+    printbuf_reset(this->_pb);
+  }
+  if(this->_to_json_string(this, this->_pb) < 0) return NULL;
+  return this->_pb->buf;
+}
+
+
+/* json_object_object */
+
+static int json_object_object_to_json_string(struct json_object* this,
+					     struct printbuf *pb)
+{
+  int i=0;
+  sprintbuf(pb, "{");
+  json_object_object_foreach(this, key, val) {
+    if(i) sprintbuf(pb, ",");
+    sprintbuf(pb, " \"");
+    json_escape_str(pb, key);
+    sprintbuf(pb, "\": ");
+    if(val == NULL) sprintbuf(pb, "null");
+    else val->_to_json_string(val, pb);
+    i++;
+  }
+  return sprintbuf(pb, " }");
+}
+
+static void json_object_lh_entry_free(struct lh_entry *ent)
+{
+  free(ent->k);
+  json_object_put((struct json_object*)ent->v);
+}
+
+static void json_object_object_delete(struct json_object* this)
+{
+  lh_table_free(this->o.c_object);
+  json_object_generic_delete(this);
+}
+
+struct json_object* json_object_new_object()
+{
+  struct json_object *this = json_object_new(json_type_object);
+  if(!this) return NULL;
+  this->_delete = &json_object_object_delete;
+  this->_to_json_string = &json_object_object_to_json_string;
+  this->o.c_object = lh_kchar_table_new(JSON_OBJECT_DEF_HASH_ENTIRES,
+					NULL, &json_object_lh_entry_free);
+  return this;
+}
+
+struct lh_table* json_object_get_object(struct json_object *this)
+{
+  if(!this) return NULL;
+  switch(this->o_type) {
+  case json_type_object:
+    return this->o.c_object;
+  default:
+    return NULL;
+  }
+}
+
+void json_object_object_add(struct json_object* this, char *key,
+			    struct json_object *val)
+{
+  lh_table_delete(this->o.c_object, key);
+  lh_table_insert(this->o.c_object, strdup(key), val);
+}
+
+struct json_object* json_object_object_get(struct json_object* this, char *key)
+{
+  return (struct json_object*) lh_table_lookup(this->o.c_object, key);
+}
+
+void json_object_object_del(struct json_object* this, char *key)
+{
+  lh_table_delete(this->o.c_object, key);
+}
+
+
+/* json_object_boolean */
+
+static int json_object_boolean_to_json_string(struct json_object* this,
+					      struct printbuf *pb)
+{
+  if(this->o.c_boolean) return sprintbuf(pb, "true");
+  else return sprintbuf(pb, "false");
+}
+
+struct json_object* json_object_new_boolean(boolean b)
+{
+  struct json_object *this = json_object_new(json_type_boolean);
+  if(!this) return NULL;
+  this->_to_json_string = &json_object_boolean_to_json_string;
+  this->o.c_boolean = b;
+  return this;
+}
+
+boolean json_object_get_boolean(struct json_object *this)
+{
+  if(!this) return FALSE;
+  switch(this->o_type) {
+  case json_type_boolean:
+    return this->o.c_boolean;
+  case json_type_int:
+    return (this->o.c_int != 0);
+  case json_type_double:
+    return (this->o.c_double != 0);
+  case json_type_string:
+    if(strlen(this->o.c_string)) return TRUE;
+  default:
+    return TRUE;
+  }
+}
+
+
+/* json_object_int */
+
+static int json_object_int_to_json_string(struct json_object* this,
+					  struct printbuf *pb)
+{
+  return sprintbuf(pb, "%d", this->o.c_int);
+}
+
+struct json_object* json_object_new_int(int i)
+{
+  struct json_object *this = json_object_new(json_type_int);
+  if(!this) return NULL;
+  this->_to_json_string = &json_object_int_to_json_string;
+  this->o.c_int = i;
+  return this;
+}
+
+int json_object_get_int(struct json_object *this)
+{
+  int cint;
+
+  if(!this) return 0;
+  switch(this->o_type) {
+  case json_type_int:
+    return this->o.c_int;
+  case json_type_double:
+    return this->o.c_double;
+  case json_type_boolean:
+    return this->o.c_boolean;
+  case json_type_string:
+    if(sscanf(this->o.c_string, "%d", &cint) == 1) return cint;
+  default:
+    return 0;
+  }
+}
+
+
+/* json_object_double */
+
+static int json_object_double_to_json_string(struct json_object* this,
+					     struct printbuf *pb)
+{
+  return sprintbuf(pb, "%lf", this->o.c_double);
+}
+
+struct json_object* json_object_new_double(double d)
+{
+  struct json_object *this = json_object_new(json_type_double);
+  if(!this) return NULL;
+  this->_to_json_string = &json_object_double_to_json_string;
+  this->o.c_double = d;
+  return this;
+}
+
+double json_object_get_double(struct json_object *this)
+{
+  double cdouble;
+
+  if(!this) return 0.0;
+  switch(this->o_type) {
+  case json_type_double:
+    return this->o.c_double;
+  case json_type_int:
+    return this->o.c_int;
+  case json_type_boolean:
+    return this->o.c_boolean;
+  case json_type_string:
+    if(sscanf(this->o.c_string, "%lf", &cdouble) == 1) return cdouble;
+  default:
+    return 0.0;
+  }
+}
+
+
+/* json_object_string */
+
+static int json_object_string_to_json_string(struct json_object* this,
+					     struct printbuf *pb)
+{
+  sprintbuf(pb, "\"");
+  json_escape_str(pb, this->o.c_string);
+  sprintbuf(pb, "\"");
+  return 0;
+}
+
+static void json_object_string_delete(struct json_object* this)
+{
+  free(this->o.c_string);
+  json_object_generic_delete(this);
+}
+
+struct json_object* json_object_new_string(char *s)
+{
+  struct json_object *this = json_object_new(json_type_string);
+  if(!this) return NULL;
+  this->_delete = &json_object_string_delete;
+  this->_to_json_string = &json_object_string_to_json_string;
+  this->o.c_string = strdup(s);
+  return this;
+}
+
+struct json_object* json_object_new_string_len(char *s, int len)
+{
+  struct json_object *this = json_object_new(json_type_string);
+  if(!this) return NULL;
+  this->_delete = &json_object_string_delete;
+  this->_to_json_string = &json_object_string_to_json_string;
+  this->o.c_string = strndup(s, len);
+  return this;
+}
+
+char* json_object_get_string(struct json_object *this)
+{
+  if(!this) return NULL;
+  switch(this->o_type) {
+  case json_type_string:
+    return this->o.c_string;
+  default:
+    return json_object_to_json_string(this);
+  }
+}
+
+
+/* json_object_array */
+
+static int json_object_array_to_json_string(struct json_object* this,
+					    struct printbuf *pb)
+{
+  sprintbuf(pb, "[");
+  for(int i=0; i < json_object_array_length(this); i++) {
+    if(i) sprintbuf(pb, ", ");
+    else sprintbuf(pb, " ");
+    struct json_object *val = json_object_array_get_idx(this, i);
+    if(val == NULL) sprintbuf(pb, "null");
+    else val->_to_json_string(val, pb);
+  }
+  return sprintbuf(pb, " ]");
+}
+
+static void json_object_array_entry_free(void *data)
+{
+  json_object_put((struct json_object*)data);
+}
+
+static void json_object_array_delete(struct json_object* this)
+{
+  array_list_free(this->o.c_array);
+  json_object_generic_delete(this);
+}
+
+struct json_object* json_object_new_array()
+{
+  struct json_object *this = json_object_new(json_type_array);
+  if(!this) return NULL;
+  this->_delete = &json_object_array_delete;
+  this->_to_json_string = &json_object_array_to_json_string;
+  this->o.c_array = array_list_new(&json_object_array_entry_free);
+  return this;
+}
+
+struct array_list* json_object_get_array(struct json_object *this)
+{
+  if(!this) return NULL;
+  switch(this->o_type) {
+  case json_type_array:
+    return this->o.c_array;
+  default:
+    return NULL;
+  }
+}
+
+int json_object_array_length(struct json_object *this)
+{
+  return array_list_length(this->o.c_array);
+}
+
+int json_object_array_add(struct json_object *this,struct json_object *val)
+{
+  return array_list_add(this->o.c_array, val);
+}
+
+int json_object_array_put_idx(struct json_object *this, int idx,
+			      struct json_object *val)
+{
+  return array_list_put_idx(this->o.c_array, idx, val);
+}
+
+struct json_object* json_object_array_get_idx(struct json_object *this,
+					      int idx)
+{
+  return (struct json_object*)array_list_get_idx(this->o.c_array, idx);
+}
+