Module sciter::value [−] [src]

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 new():

use sciter::Value;

let v = Value::new();
assert!(v.is_undefined());
assert!(!v.is_null());

Or explicitly create Value for 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 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"));

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 is two functions that converts 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

sciter::value wrapper. See the module-level documentation.

Enums

VALUE_RESULT
VALUE_STRING_CVT_TYPE
VALUE_TYPE

Traits

FromValue

Helper trait