1
 2
 3
 4
 5
 6
 7
 8
 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48


// Copyright 2017 The gltf Library Developers
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.

use json;
use std::slice;

/// Iterator over extension strings.
#[derive(Clone, Debug)]
pub struct Extensions<'a>(slice::Iter<'a, String>);

/// The (immutable) root object for a glTF asset.
#[derive(Clone, Debug)]
pub struct Root(json::root::Root);

impl Root {
    /// Constructs a `Camera`.
    pub fn new(json: json::root::Root) -> Self {
        Root(json)
    }

    /// Returns the internal JSON item.
    pub fn as_json(&self) -> &json::root::Root {
        &self.0
    }
    
    /// Returns the extensions referenced in this .gltf file.
    pub fn extensions_used(&self) -> Extensions {
        Extensions(self.0.extensions_used.iter())
    }

    /// Returns the extensions required to load and render this asset.
    pub fn extensions_required(&self) -> Extensions {
        Extensions(self.0.extensions_required.iter())
    }
}

impl<'a> Iterator for Extensions<'a> {
    type Item = &'a str;
    fn next(&mut self) -> Option<Self::Item> {
        self.0.next().map(String::as_str)
    }
}