rlua 0.14.2

High level bindings to Lua 5.3
Documentation 
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
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177

use {Lua, Nil, Result, Table, Value};

#[test]
fn test_set_get() {
    let lua = Lua::new();
    let globals = lua.globals();
    globals.set("foo", "bar").unwrap();
    globals.set("baz", "baf").unwrap();
    assert_eq!(globals.get::<_, String>("foo").unwrap(), "bar");
    assert_eq!(globals.get::<_, String>("baz").unwrap(), "baf");
}

#[test]
fn test_table() {
    let lua = Lua::new();
    let globals = lua.globals();

    globals.set("table", lua.create_table().unwrap()).unwrap();
    let table1: Table = globals.get("table").unwrap();
    let table2: Table = globals.get("table").unwrap();

    table1.set("foo", "bar").unwrap();
    table2.set("baz", "baf").unwrap();

    assert_eq!(table2.get::<_, String>("foo").unwrap(), "bar");
    assert_eq!(table1.get::<_, String>("baz").unwrap(), "baf");

    lua.exec::<()>(
        r#"
                table1 = {1, 2, 3, 4, 5}
                table2 = {}
                table3 = {1, 2, nil, 4, 5}
            "#,
        None,
    ).unwrap();

    let table1 = globals.get::<_, Table>("table1").unwrap();
    let table2 = globals.get::<_, Table>("table2").unwrap();
    let table3 = globals.get::<_, Table>("table3").unwrap();

    assert_eq!(table1.len().unwrap(), 5);
    assert_eq!(
        table1
            .clone()
            .pairs()
            .collect::<Result<Vec<(i64, i64)>>>()
            .unwrap(),
        vec![(1, 1), (2, 2), (3, 3), (4, 4), (5, 5)]
    );
    assert_eq!(
        table1
            .clone()
            .sequence_values()
            .collect::<Result<Vec<i64>>>()
            .unwrap(),
        vec![1, 2, 3, 4, 5]
    );

    assert_eq!(table2.len().unwrap(), 0);
    assert_eq!(
        table2
            .clone()
            .pairs()
            .collect::<Result<Vec<(i64, i64)>>>()
            .unwrap(),
        vec![]
    );
    assert_eq!(
        table2
            .sequence_values()
            .collect::<Result<Vec<i64>>>()
            .unwrap(),
        vec![]
    );

    // sequence_values should only iterate until the first border
    assert_eq!(
        table3
            .sequence_values()
            .collect::<Result<Vec<i64>>>()
            .unwrap(),
        vec![1, 2]
    );

    globals
        .set(
            "table4",
            lua.create_sequence_from(vec![1, 2, 3, 4, 5]).unwrap(),
        )
        .unwrap();
    let table4 = globals.get::<_, Table>("table4").unwrap();
    assert_eq!(
        table4.pairs().collect::<Result<Vec<(i64, i64)>>>().unwrap(),
        vec![(1, 1), (2, 2), (3, 3), (4, 4), (5, 5)]
    );
}

#[test]
fn test_table_scope() {
    let lua = Lua::new();
    let globals = lua.globals();
    lua.exec::<()>(
        r#"
            touter = {
                tin = {1, 2, 3}
            }
        "#,
        None,
    ).unwrap();

    // Make sure that table gets do not borrow the table, but instead just borrow lua.
    let tin;
    {
        let touter = globals.get::<_, Table>("touter").unwrap();
        tin = touter.get::<_, Table>("tin").unwrap();
    }

    assert_eq!(tin.get::<_, i64>(1).unwrap(), 1);
    assert_eq!(tin.get::<_, i64>(2).unwrap(), 2);
    assert_eq!(tin.get::<_, i64>(3).unwrap(), 3);
}

#[test]
fn test_metatable() {
    let lua = Lua::new();

    let table = lua.create_table().unwrap();
    let metatable = lua.create_table().unwrap();
    metatable
        .set(
            "__index",
            lua.create_function(|_, ()| Ok("index_value")).unwrap(),
        )
        .unwrap();
    table.set_metatable(Some(metatable));
    assert_eq!(table.get::<_, String>("any_key").unwrap(), "index_value");
    match table.raw_get::<_, Value>("any_key").unwrap() {
        Nil => {}
        _ => panic!(),
    }
    table.set_metatable(None);
    match table.get::<_, Value>("any_key").unwrap() {
        Nil => {}
        _ => panic!(),
    };
}

#[test]
fn test_table_error() {
    let lua = Lua::new();
    let globals = lua.globals();
    lua.exec::<()>(
        r#"
            table = {}
            setmetatable(table, {
                __index = function()
                    error("lua error")
                end,
                __newindex = function()
                    error("lua error")
                end,
                __len = function()
                    error("lua error")
                end
            })
        "#,
        None,
    ).unwrap();

    let bad_table: Table = globals.get("table").unwrap();
    assert!(bad_table.set(1, 1).is_err());
    assert!(bad_table.get::<_, i32>(1).is_err());
    assert!(bad_table.len().is_err());
    assert!(bad_table.raw_set(1, 1).is_ok());
    assert!(bad_table.raw_get::<_, i32>(1).is_ok());
    assert_eq!(bad_table.raw_len(), 1);
}