[−][src]Module sciter::value
Rust interface to the sciter::value
.
Sciter Value
holds superset of JSON objects.
It can contain as pure JSON objects (numbers, strings, maps and arrays) as internal objects like DOM elements, proxies of script functions, objects and arrays.
Basic usage
You can create an empty (undefined) Sciter value with Value::new()
:
use sciter::Value; let v = Value::new(); assert!(v.is_undefined()); assert!(!v.is_null());
Or explicitly create Value
of the specified type:
use sciter::Value; let v = Value::null(); assert!(v.is_null()); let v = Value::symbol("hello"); assert!(v.is_symbol()); assert!(v.is_string()); let v = Value::error("hello"); assert!(v.is_error_string()); assert!(v.is_string()); // allocate a new array with 4 empty elements let v = Value::array(4); assert!(v.is_array()); assert!(v.len() == 4); // allocate a new value with map type let v = Value::map(); assert!(v.is_map()); assert!(v.len() == 0);
Also there is conversion from Rust types:
use sciter::Value; let v = Value::from(true); assert!(v.is_bool()); let v = Value::from(1); assert!(v.is_int()); let v = Value::from(1.0); assert!(v.is_float()); let v = Value::from("hello"); assert!(v.is_string()); let v = Value::from(b"123".as_ref()); assert!(v.is_bytes());
And from a sequence of objects:
use sciter::Value; let v: Value = ["1","2","3"].iter().cloned().collect(); assert!(v.is_array()); assert_eq!(v.len(), 3); assert_eq!(v[0], Value::from("1"));
And also there is a couple of macros for container literals with specific type
which are just shorthands for manual construction using the
set_item()
and push()
methods:
let map = vmap! { "one" => 1, "two" => 2.0, "three" => "", }; assert!(map.is_map()); assert_eq!(map.len(), 3); let array = varray![1, 2.0, "three"]; assert!(array.is_array()); assert_eq!(array.len(), 3);
To access its contents you should use one of to_
methods:
use sciter::Value; let v = Value::from(4); assert_eq!(v.to_int(), Some(4));
Note that there are two functions that convert Value
to JSON and back:
use sciter::Value; let mut v: Value = "[1, 2, 3, 4]".parse().unwrap(); let json_str = v.into_string();
Array access:
use sciter::Value; let mut v: Value = "[10, 20]".parse().unwrap(); assert_eq!(v[0], Value::from(10)); // explicit arguments: v.set(1, Value::from(21)); v.set(2, Value::from(22)); // implicit arguments: v.set(1, 21); v.set(2, 22); assert_eq!(v.len(), 3); assert!(v.get(0).is_int());
Map access:
use sciter::Value; let mut v: Value = "{one: 1, two: 2}".parse().unwrap(); assert_eq!(v["one"], 1.into()); assert_eq!(v.get_item("one"), 1.into()); assert_eq!(v[Value::from("one")], Value::from(1)); v.set_item("three", 3); assert!(v.get_item("one").is_int());
Structs
Value |
|
Enums
VALUE_RESULT | |
VALUE_STRING_CVT_TYPE | |
VALUE_TYPE | Type identifier of the value. |
Traits
FromValue | Helper trait |