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jsserialize.rs
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jsserialize.rs
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extern crate emval_sys;
extern crate libc;
use emval_sys::*;
use std::mem::size_of;
use std::ptr;
use self::libc::malloc;
use jsid::*;
use internalid::*;
pub trait JSSerialize: JSID {
type WireType: InternalID;
fn to_wire_type(&self) -> Self::WireType;
fn serialize(&self) -> EM_GENERIC_WIRE_TYPE;
}
pub fn to_generic_wire_type(data: usize) -> EM_GENERIC_WIRE_TYPE {
let mut result: EM_GENERIC_WIRE_TYPE = 0f64;
unsafe {
ptr::write((&mut result as *mut f64) as _, data);
}
result
}
impl JSSerialize for () {
type WireType = ();
fn to_wire_type(&self) -> () {}
fn serialize(&self) -> EM_GENERIC_WIRE_TYPE {
to_generic_wire_type(0usize)
}
}
impl JSSerialize for str {
type WireType = usize;
fn to_wire_type(&self) -> usize {
let chars: Vec<char> = self.chars().collect();
let len = chars.len();
let bytes_len = len * size_of::<char>();
unsafe {
let s: *mut usize = malloc(size_of::<usize>() + bytes_len) as _;
ptr::write(s, len);
let c = s.offset(1) as *mut u8;
ptr::copy(chars.as_ptr() as _, c, bytes_len);
s as _
}
}
fn serialize(&self) -> EM_GENERIC_WIRE_TYPE {
to_generic_wire_type(self.to_wire_type())
}
}
macro_rules! serialize_rust_integer {
( $( $t:ident )* ) => {
$(
impl JSSerialize for $t {
type WireType = usize;
fn to_wire_type(&self) -> usize {
*self as _
}
fn serialize(&self) -> EM_GENERIC_WIRE_TYPE {
to_generic_wire_type(self.to_wire_type())
}
}
)*
}
}
serialize_rust_integer!(isize i32 i16 i8 usize u32 u16 u8 bool);
macro_rules! serialize_rust_real {
( $( $t:ident )* ) => {
$(
impl JSSerialize for $t {
type WireType = $t;
fn to_wire_type(&self) -> $t {
*self
}
fn serialize(&self) -> EM_GENERIC_WIRE_TYPE {
*self as _
}
}
)*
}
}
serialize_rust_real!(f64 f32);