emlite

Struct Val

Source 
pub struct Val { /* private fields */ }
Expand description

A wrapper around a javascript handle

Implementations§

Source§

impl Val

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pub fn take_ownership(handle: Handle) -> Val

Takes the ownership of a handle

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pub fn from_val(v: Val) -> Self

Creates a Val object from another

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pub fn global_this() -> Val

Returns the globalThis object

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pub fn get<T: Into<Val>>(&self, prop: T) -> Val

Gets the property prop

Examples found in repository?
examples/dom.rs (line 15)
3fn main() {
4    let document = Val::global("document");
5    let elem = document.call("createElement", &argv!["BUTTON"]);
6    elem.set("textContent", Val::from("Click"));
7    let body = document.call("getElementsByTagName", &argv!["body"]).at(0);
8    elem.call(
9        "addEventListener",
10        &argv![
11            "click",
12            Val::make_fn(|ev| {
13                let console = Console::get();
14                console.call("clear", &[]);
15                console.log(&[ev[0].get("clientX")]);
16                println!(
17                    "client x: {}",
18                    ev[0].get("clientX").as_i32()
19                );
20                println!("hello from Rust");
21                Val::undefined()
22            })
23        ],
24    );
25    body.call("appendChild", &argv![elem]);
26}
More examples
Hide additional examples
examples/audio.rs (line 17)
3fn main() {
4    #[allow(non_snake_case)]
5    let mut AudioContext = Val::global("AudioContext");
6    if !AudioContext.as_bool() {
7        println!("No global AudioContext, trying webkitAudioContext");
8        AudioContext = Val::global("webkitAudioContext");
9    }
10
11    println!("Got an AudioContext");
12    let context = AudioContext.new(&[]);
13    let oscillator = context.call("createOscillator", &[]);
14
15    println!("Configuring oscillator");
16    oscillator.set("type", "triangle");
17    oscillator.get("frequency").set("value", Val::from(261.63)); // Middle C
18
19    let document = Val::global("document");
20    let elem = document.call("createElement", &argv!["BUTTON"]);
21    elem.set("textContent", "Click");
22    let body = document.call("getElementsByTagName", &argv!["body"]).at(0);
23    elem.call(
24        "addEventListener",
25        &argv![
26            "click",
27            Val::make_fn(move |_| {
28                println!("Playing");
29                oscillator.call("connect", &argv![context.get("destination")]);
30                oscillator.call("start", &argv![0]);
31                println!("All done!");
32                Val::undefined()
33            })
34        ],
35    );
36    body.call("appendChild", &argv![elem]);
37}
Source

pub fn global(name: &str) -> Val

Gets a global object by name

Examples found in repository?
examples/dom.rs (line 4)
3fn main() {
4    let document = Val::global("document");
5    let elem = document.call("createElement", &argv!["BUTTON"]);
6    elem.set("textContent", Val::from("Click"));
7    let body = document.call("getElementsByTagName", &argv!["body"]).at(0);
8    elem.call(
9        "addEventListener",
10        &argv![
11            "click",
12            Val::make_fn(|ev| {
13                let console = Console::get();
14                console.call("clear", &[]);
15                console.log(&[ev[0].get("clientX")]);
16                println!(
17                    "client x: {}",
18                    ev[0].get("clientX").as_i32()
19                );
20                println!("hello from Rust");
21                Val::undefined()
22            })
23        ],
24    );
25    body.call("appendChild", &argv![elem]);
26}
More examples
Hide additional examples
examples/audio.rs (line 5)
3fn main() {
4    #[allow(non_snake_case)]
5    let mut AudioContext = Val::global("AudioContext");
6    if !AudioContext.as_bool() {
7        println!("No global AudioContext, trying webkitAudioContext");
8        AudioContext = Val::global("webkitAudioContext");
9    }
10
11    println!("Got an AudioContext");
12    let context = AudioContext.new(&[]);
13    let oscillator = context.call("createOscillator", &[]);
14
15    println!("Configuring oscillator");
16    oscillator.set("type", "triangle");
17    oscillator.get("frequency").set("value", Val::from(261.63)); // Middle C
18
19    let document = Val::global("document");
20    let elem = document.call("createElement", &argv!["BUTTON"]);
21    elem.set("textContent", "Click");
22    let body = document.call("getElementsByTagName", &argv!["body"]).at(0);
23    elem.call(
24        "addEventListener",
25        &argv![
26            "click",
27            Val::make_fn(move |_| {
28                println!("Playing");
29                oscillator.call("connect", &argv![context.get("destination")]);
30                oscillator.call("start", &argv![0]);
31                println!("All done!");
32                Val::undefined()
33            })
34        ],
35    );
36    body.call("appendChild", &argv![elem]);
37}
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pub fn null() -> Val

Gets a js null Val

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pub fn undefined() -> Val

Gets a js undefined Val

Examples found in repository?
examples/dom.rs (line 21)
3fn main() {
4    let document = Val::global("document");
5    let elem = document.call("createElement", &argv!["BUTTON"]);
6    elem.set("textContent", Val::from("Click"));
7    let body = document.call("getElementsByTagName", &argv!["body"]).at(0);
8    elem.call(
9        "addEventListener",
10        &argv![
11            "click",
12            Val::make_fn(|ev| {
13                let console = Console::get();
14                console.call("clear", &[]);
15                console.log(&[ev[0].get("clientX")]);
16                println!(
17                    "client x: {}",
18                    ev[0].get("clientX").as_i32()
19                );
20                println!("hello from Rust");
21                Val::undefined()
22            })
23        ],
24    );
25    body.call("appendChild", &argv![elem]);
26}
More examples
Hide additional examples
examples/audio.rs (line 32)
3fn main() {
4    #[allow(non_snake_case)]
5    let mut AudioContext = Val::global("AudioContext");
6    if !AudioContext.as_bool() {
7        println!("No global AudioContext, trying webkitAudioContext");
8        AudioContext = Val::global("webkitAudioContext");
9    }
10
11    println!("Got an AudioContext");
12    let context = AudioContext.new(&[]);
13    let oscillator = context.call("createOscillator", &[]);
14
15    println!("Configuring oscillator");
16    oscillator.set("type", "triangle");
17    oscillator.get("frequency").set("value", Val::from(261.63)); // Middle C
18
19    let document = Val::global("document");
20    let elem = document.call("createElement", &argv!["BUTTON"]);
21    elem.set("textContent", "Click");
22    let body = document.call("getElementsByTagName", &argv!["body"]).at(0);
23    elem.call(
24        "addEventListener",
25        &argv![
26            "click",
27            Val::make_fn(move |_| {
28                println!("Playing");
29                oscillator.call("connect", &argv![context.get("destination")]);
30                oscillator.call("start", &argv![0]);
31                println!("All done!");
32                Val::undefined()
33            })
34        ],
35    );
36    body.call("appendChild", &argv![elem]);
37}
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pub fn object() -> Val

Gets a new js object

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pub fn array() -> Val

Gets a new js array

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pub fn from_i32(i: i32) -> Val

Creates a Val from an i32

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pub fn from_f64(f: f64) -> Val

Creates a Val from an f64

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pub fn from_str(s: &str) -> Val

Creates a Val from str

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pub fn as_handle(&self) -> Handle

Returns the raw js handle

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pub fn set<K: Into<Val>, V: Into<Val>>(&self, prop: K, val: V)

Set the underlying js object property prop to val

Examples found in repository?
examples/dom.rs (line 6)
3fn main() {
4    let document = Val::global("document");
5    let elem = document.call("createElement", &argv!["BUTTON"]);
6    elem.set("textContent", Val::from("Click"));
7    let body = document.call("getElementsByTagName", &argv!["body"]).at(0);
8    elem.call(
9        "addEventListener",
10        &argv![
11            "click",
12            Val::make_fn(|ev| {
13                let console = Console::get();
14                console.call("clear", &[]);
15                console.log(&[ev[0].get("clientX")]);
16                println!(
17                    "client x: {}",
18                    ev[0].get("clientX").as_i32()
19                );
20                println!("hello from Rust");
21                Val::undefined()
22            })
23        ],
24    );
25    body.call("appendChild", &argv![elem]);
26}
More examples
Hide additional examples
examples/audio.rs (line 16)
3fn main() {
4    #[allow(non_snake_case)]
5    let mut AudioContext = Val::global("AudioContext");
6    if !AudioContext.as_bool() {
7        println!("No global AudioContext, trying webkitAudioContext");
8        AudioContext = Val::global("webkitAudioContext");
9    }
10
11    println!("Got an AudioContext");
12    let context = AudioContext.new(&[]);
13    let oscillator = context.call("createOscillator", &[]);
14
15    println!("Configuring oscillator");
16    oscillator.set("type", "triangle");
17    oscillator.get("frequency").set("value", Val::from(261.63)); // Middle C
18
19    let document = Val::global("document");
20    let elem = document.call("createElement", &argv!["BUTTON"]);
21    elem.set("textContent", "Click");
22    let body = document.call("getElementsByTagName", &argv!["body"]).at(0);
23    elem.call(
24        "addEventListener",
25        &argv![
26            "click",
27            Val::make_fn(move |_| {
28                println!("Playing");
29                oscillator.call("connect", &argv![context.get("destination")]);
30                oscillator.call("start", &argv![0]);
31                println!("All done!");
32                Val::undefined()
33            })
34        ],
35    );
36    body.call("appendChild", &argv![elem]);
37}
Source

pub fn has<T: Into<Val>>(&self, prop: T) -> bool

Checks whether a property prop exists

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pub fn has_own_property(&self, prop: &str) -> bool

Checks whether a non-inherited property prop exists

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pub fn type_of(&self) -> String

Gets the typeof the underlying js object

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pub fn at<T: Into<Val>>(&self, idx: T) -> Val

Gets the element at index idx. Assumes the underlying js type is indexable

Examples found in repository?
examples/dom.rs (line 7)
3fn main() {
4    let document = Val::global("document");
5    let elem = document.call("createElement", &argv!["BUTTON"]);
6    elem.set("textContent", Val::from("Click"));
7    let body = document.call("getElementsByTagName", &argv!["body"]).at(0);
8    elem.call(
9        "addEventListener",
10        &argv![
11            "click",
12            Val::make_fn(|ev| {
13                let console = Console::get();
14                console.call("clear", &[]);
15                console.log(&[ev[0].get("clientX")]);
16                println!(
17                    "client x: {}",
18                    ev[0].get("clientX").as_i32()
19                );
20                println!("hello from Rust");
21                Val::undefined()
22            })
23        ],
24    );
25    body.call("appendChild", &argv![elem]);
26}
More examples
Hide additional examples
examples/audio.rs (line 22)
3fn main() {
4    #[allow(non_snake_case)]
5    let mut AudioContext = Val::global("AudioContext");
6    if !AudioContext.as_bool() {
7        println!("No global AudioContext, trying webkitAudioContext");
8        AudioContext = Val::global("webkitAudioContext");
9    }
10
11    println!("Got an AudioContext");
12    let context = AudioContext.new(&[]);
13    let oscillator = context.call("createOscillator", &[]);
14
15    println!("Configuring oscillator");
16    oscillator.set("type", "triangle");
17    oscillator.get("frequency").set("value", Val::from(261.63)); // Middle C
18
19    let document = Val::global("document");
20    let elem = document.call("createElement", &argv!["BUTTON"]);
21    elem.set("textContent", "Click");
22    let body = document.call("getElementsByTagName", &argv!["body"]).at(0);
23    elem.call(
24        "addEventListener",
25        &argv![
26            "click",
27            Val::make_fn(move |_| {
28                println!("Playing");
29                oscillator.call("connect", &argv![context.get("destination")]);
30                oscillator.call("start", &argv![0]);
31                println!("All done!");
32                Val::undefined()
33            })
34        ],
35    );
36    body.call("appendChild", &argv![elem]);
37}
Source

pub fn as_i32(&self) -> i32

Gets the underlying i32 value of a js object

Examples found in repository?
examples/dom.rs (line 18)
3fn main() {
4    let document = Val::global("document");
5    let elem = document.call("createElement", &argv!["BUTTON"]);
6    elem.set("textContent", Val::from("Click"));
7    let body = document.call("getElementsByTagName", &argv!["body"]).at(0);
8    elem.call(
9        "addEventListener",
10        &argv![
11            "click",
12            Val::make_fn(|ev| {
13                let console = Console::get();
14                console.call("clear", &[]);
15                console.log(&[ev[0].get("clientX")]);
16                println!(
17                    "client x: {}",
18                    ev[0].get("clientX").as_i32()
19                );
20                println!("hello from Rust");
21                Val::undefined()
22            })
23        ],
24    );
25    body.call("appendChild", &argv![elem]);
26}
Source

pub fn as_bool(&self) -> bool

Gets the underlying boolean value of a js object

Examples found in repository?
examples/audio.rs (line 6)
3fn main() {
4    #[allow(non_snake_case)]
5    let mut AudioContext = Val::global("AudioContext");
6    if !AudioContext.as_bool() {
7        println!("No global AudioContext, trying webkitAudioContext");
8        AudioContext = Val::global("webkitAudioContext");
9    }
10
11    println!("Got an AudioContext");
12    let context = AudioContext.new(&[]);
13    let oscillator = context.call("createOscillator", &[]);
14
15    println!("Configuring oscillator");
16    oscillator.set("type", "triangle");
17    oscillator.get("frequency").set("value", Val::from(261.63)); // Middle C
18
19    let document = Val::global("document");
20    let elem = document.call("createElement", &argv!["BUTTON"]);
21    elem.set("textContent", "Click");
22    let body = document.call("getElementsByTagName", &argv!["body"]).at(0);
23    elem.call(
24        "addEventListener",
25        &argv![
26            "click",
27            Val::make_fn(move |_| {
28                println!("Playing");
29                oscillator.call("connect", &argv![context.get("destination")]);
30                oscillator.call("start", &argv![0]);
31                println!("All done!");
32                Val::undefined()
33            })
34        ],
35    );
36    body.call("appendChild", &argv![elem]);
37}
Source

pub fn as_f64(&self) -> f64

Gets the underlying f64 value of a js object

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pub fn as_string(&self) -> String

Gets the underlying string value of a js object

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pub fn to_vec_i32(&self) -> Vec<i32>

Converts the underlying js array to an Vec of i32

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pub fn to_vec_f64(&self) -> Vec<f64>

Converts the underlying js array to an Vec of f64

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pub fn call(&self, f: &str, args: &[Val]) -> Val

Calls the method f with args, can return an undefined js value

Examples found in repository?
examples/dom.rs (line 5)
3fn main() {
4    let document = Val::global("document");
5    let elem = document.call("createElement", &argv!["BUTTON"]);
6    elem.set("textContent", Val::from("Click"));
7    let body = document.call("getElementsByTagName", &argv!["body"]).at(0);
8    elem.call(
9        "addEventListener",
10        &argv![
11            "click",
12            Val::make_fn(|ev| {
13                let console = Console::get();
14                console.call("clear", &[]);
15                console.log(&[ev[0].get("clientX")]);
16                println!(
17                    "client x: {}",
18                    ev[0].get("clientX").as_i32()
19                );
20                println!("hello from Rust");
21                Val::undefined()
22            })
23        ],
24    );
25    body.call("appendChild", &argv![elem]);
26}
More examples
Hide additional examples
examples/audio.rs (line 13)
3fn main() {
4    #[allow(non_snake_case)]
5    let mut AudioContext = Val::global("AudioContext");
6    if !AudioContext.as_bool() {
7        println!("No global AudioContext, trying webkitAudioContext");
8        AudioContext = Val::global("webkitAudioContext");
9    }
10
11    println!("Got an AudioContext");
12    let context = AudioContext.new(&[]);
13    let oscillator = context.call("createOscillator", &[]);
14
15    println!("Configuring oscillator");
16    oscillator.set("type", "triangle");
17    oscillator.get("frequency").set("value", Val::from(261.63)); // Middle C
18
19    let document = Val::global("document");
20    let elem = document.call("createElement", &argv!["BUTTON"]);
21    elem.set("textContent", "Click");
22    let body = document.call("getElementsByTagName", &argv!["body"]).at(0);
23    elem.call(
24        "addEventListener",
25        &argv![
26            "click",
27            Val::make_fn(move |_| {
28                println!("Playing");
29                oscillator.call("connect", &argv![context.get("destination")]);
30                oscillator.call("start", &argv![0]);
31                println!("All done!");
32                Val::undefined()
33            })
34        ],
35    );
36    body.call("appendChild", &argv![elem]);
37}
Source

pub fn new(&self, args: &[Val]) -> Val

Calls the object’s constructor with args constructing a new object

Examples found in repository?
examples/audio.rs (line 12)
3fn main() {
4    #[allow(non_snake_case)]
5    let mut AudioContext = Val::global("AudioContext");
6    if !AudioContext.as_bool() {
7        println!("No global AudioContext, trying webkitAudioContext");
8        AudioContext = Val::global("webkitAudioContext");
9    }
10
11    println!("Got an AudioContext");
12    let context = AudioContext.new(&[]);
13    let oscillator = context.call("createOscillator", &[]);
14
15    println!("Configuring oscillator");
16    oscillator.set("type", "triangle");
17    oscillator.get("frequency").set("value", Val::from(261.63)); // Middle C
18
19    let document = Val::global("document");
20    let elem = document.call("createElement", &argv!["BUTTON"]);
21    elem.set("textContent", "Click");
22    let body = document.call("getElementsByTagName", &argv!["body"]).at(0);
23    elem.call(
24        "addEventListener",
25        &argv![
26            "click",
27            Val::make_fn(move |_| {
28                println!("Playing");
29                oscillator.call("connect", &argv![context.get("destination")]);
30                oscillator.call("start", &argv![0]);
31                println!("All done!");
32                Val::undefined()
33            })
34        ],
35    );
36    body.call("appendChild", &argv![elem]);
37}
Source

pub fn invoke(&self, args: &[Val]) -> Val

Invokes the function object with args, can return an undefined js value

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pub fn make_fn_raw(f: fn(Handle, Handle) -> Handle, data: Handle) -> Val

Creates js function from a function pointer and returns its handle wrapped in a Val object

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pub fn make_fn<F: FnMut(&[Val]) -> Val>(cb: F) -> Val

Creates a js function from a Rust closure and returns a Val

Examples found in repository?
examples/dom.rs (lines 12-22)
3fn main() {
4    let document = Val::global("document");
5    let elem = document.call("createElement", &argv!["BUTTON"]);
6    elem.set("textContent", Val::from("Click"));
7    let body = document.call("getElementsByTagName", &argv!["body"]).at(0);
8    elem.call(
9        "addEventListener",
10        &argv![
11            "click",
12            Val::make_fn(|ev| {
13                let console = Console::get();
14                console.call("clear", &[]);
15                console.log(&[ev[0].get("clientX")]);
16                println!(
17                    "client x: {}",
18                    ev[0].get("clientX").as_i32()
19                );
20                println!("hello from Rust");
21                Val::undefined()
22            })
23        ],
24    );
25    body.call("appendChild", &argv![elem]);
26}
More examples
Hide additional examples
examples/audio.rs (lines 27-33)
3fn main() {
4    #[allow(non_snake_case)]
5    let mut AudioContext = Val::global("AudioContext");
6    if !AudioContext.as_bool() {
7        println!("No global AudioContext, trying webkitAudioContext");
8        AudioContext = Val::global("webkitAudioContext");
9    }
10
11    println!("Got an AudioContext");
12    let context = AudioContext.new(&[]);
13    let oscillator = context.call("createOscillator", &[]);
14
15    println!("Configuring oscillator");
16    oscillator.set("type", "triangle");
17    oscillator.get("frequency").set("value", Val::from(261.63)); // Middle C
18
19    let document = Val::global("document");
20    let elem = document.call("createElement", &argv!["BUTTON"]);
21    elem.set("textContent", "Click");
22    let body = document.call("getElementsByTagName", &argv!["body"]).at(0);
23    elem.call(
24        "addEventListener",
25        &argv![
26            "click",
27            Val::make_fn(move |_| {
28                println!("Playing");
29                oscillator.call("connect", &argv![context.get("destination")]);
30                oscillator.call("start", &argv![0]);
31                println!("All done!");
32                Val::undefined()
33            })
34        ],
35    );
36    body.call("appendChild", &argv![elem]);
37}
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pub fn await_(&self) -> Val

Awaits the invoked function object

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pub fn delete(v: Val)

Decrements the refcount of the underlying handle

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pub fn throw(v: Val)

Throws a js object represented by Val

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pub fn instanceof(&self, v: Val) -> bool

Checks whether this Val is an instanceof v

Trait Implementations§

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impl Clone for Val

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fn clone(&self) -> Val

Returns a duplicate of the value. Read more
1.0.0 · Source§

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for Val

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl Drop for Val

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fn drop(&mut self)

Executes the destructor for this type. Read more
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impl From<&str> for Val

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fn from(item: &str) -> Self

Converts to this type from the input type.
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impl From<()> for Val

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fn from(_: ()) -> Self

Converts to this type from the input type.
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impl From<String> for Val

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fn from(item: String) -> Self

Converts to this type from the input type.
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impl From<f64> for Val

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fn from(v: f64) -> Self

Converts to this type from the input type.
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impl From<i32> for Val

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fn from(v: i32) -> Self

Converts to this type from the input type.
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impl Into<Val> for Console

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fn into(self) -> Val

Converts this type into the (usually inferred) input type.
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impl Not for Val

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type Output = bool

The resulting type after applying the ! operator.
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fn not(self) -> Self::Output

Performs the unary ! operation. Read more
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impl PartialEq for Val

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fn eq(&self, other: &Val) -> bool

Tests for self and other values to be equal, and is used by ==.
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fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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impl PartialOrd for Val

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fn partial_cmp(&self, other: &Val) -> Option<Ordering>

This method returns an ordering between self and other values if one exists. Read more
1.0.0 · Source§

fn lt(&self, other: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator. Read more
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fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator. Read more
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fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator. Read more
1.0.0 · Source§

fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for self and other) and is used by the >= operator. Read more

Auto Trait Implementations§

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impl Freeze for Val

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impl RefUnwindSafe for Val

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impl Send for Val

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impl Sync for Val

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impl Unpin for Val

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impl UnwindSafe for Val

Blanket Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> CloneToUninit for T
where T: Clone,

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unsafe fn clone_to_uninit(&self, dest: *mut u8)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dest. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> ToOwned for T
where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.