Implement parsing and object_get

src/json.zig

@@ -3,16 +3,13 @@ const c = @cImport({
 });
 const std = @import("std");
 
-// NOTE: I try to be faithful to the original namings but also try to
-//       adapt some things to a more zig-ish style.
-
 pub const Obj = struct {
     obj: *c.json_object,
 
     // TODO: Port type attribute to a zig enum and assign it upon creation
 
     ///////////////////////////////////
-    // ** JSON object types creation **
+    // ** General functions **
     /////////////////////////////////
 
     pub fn newObject() Obj {
@@ -24,18 +21,21 @@ pub const Obj = struct {
     pub fn newString(s: [*c]const u8) Obj {
         return Obj{ .obj = c.json_object_new_string(s).? };
     }
-    pub const newInt = newInt32;
     pub fn newInt32(i: i32) Obj {
         return Obj{ .obj = c.json_object_new_int(i).? };
     }
     pub fn newInt64(i: i64) Obj {
         return Obj{ .obj = c.json_object_new_int64(i).? };
     }
+    pub fn newFromString(s: [*c]const u8) Obj {
+        return Obj{ .obj = c.json_tokener_parse(s).? };
+    }
 
     pub fn deinit(self: *Obj) void {
         _ = c.json_object_put(self.obj);
     }
 
+    // Not *const Obj because the json_object retains ownership of the string
     pub fn toString(self: *Obj) []const u8 {
         // TODO: Allow passing of flags as an enum like the SDL2 binding
         return std.mem.sliceTo(c.json_object_to_json_string(self.obj), 0);
@@ -47,9 +47,11 @@ pub const Obj = struct {
 
     // TODO: Create an error for type checking.
 
-    pub fn objectGet(self: *Obj, key: [*c]const u8, value: **Obj) void {
+    pub fn objectGet(self: *const Obj, key: [*c]const u8) Obj {
         // TODO: Check type and null return as errors
-        _ = c.json_object_object_get_ex(self.obj, key, value);
+        var obj: ?*c.json_object = undefined;
+        _ = c.json_object_object_get_ex(self.obj, key, &obj);
+        return Obj{ .obj = c.json_object_get(obj).? };
     }
 
     pub fn objectAdd(self: *Obj, key: [*c]const u8, value: ?*Obj) void {

src/main.zig

@@ -4,27 +4,36 @@ const sqlite = @import("sqlite");
 const Db = @import("Db.zig");
 const Item = @import("Item.zig");
 const Tag = @import("Tag.zig");
+const json = @import("json.zig");
 
 pub fn main() !void {
-    var arena = std.heap.ArenaAllocator.init(std.heap.page_allocator);
-    defer arena.deinit();
-    const alloc = arena.allocator();
-
     var db = try Db.init();
 
-    var tags = [2]Item.Tag{
-        .{ .name = "title", .value = "clean room" },
-        .{ .name = "task", .value = null },
-    };
+    //var arena = std.heap.ArenaAllocator.init(std.heap.page_allocator);
+    //defer arena.deinit();
+    //const alloc = arena.allocator();
 
-    var item = Item{ .id = null, .tags = &tags };
+    const jsonText: [:0]const u8 =
+        \\{
+        \\    "tags": {
+        \\        "title": "clean room",
+        \\        "task": null
+        \\    }
+        \\}
+    ;
 
-    try item.persist(&db);
+    var jsonItem = json.Obj.newFromString(jsonText);
+    defer jsonItem.deinit();
 
-    var jobj = item.toJson();
+    _ = db;
+
+    //var item = Item.fromJson(jsonItem);
+
+    //try item.persist(&db);
+
+    //var jobj = item.toJson();
+    var jobj = jsonItem.objectGet("tags");
     defer jobj.deinit();
 
-    _ = alloc;
-
     std.debug.print("{s}\n", .{jobj.toString()});
 }