haste-compiler-0.5.1.3: lib/array.js

// Functions for dealing with arrays.

function newArr(n, x) {
    var arr = new Array(n);
    for(var i = 0; i < n; ++i) {
        arr[i] = x;
    }
    return arr;
}

// Create all views at once; perhaps it's wasteful, but it's better than having
// to check for the right view at each read or write.
function newByteArr(n) {
    // Pad the thing to multiples of 8.
    var padding = 8 - n % 8;
    if(padding < 8) {
        n += padding;
    }
    var arr = {};
    var buffer = new ArrayBuffer(n);
    var views = {};
    views['i8']  = new Int8Array(buffer);
    views['i16'] = new Int16Array(buffer);
    views['i32'] = new Int32Array(buffer);
    views['w8']  = new Uint8Array(buffer);
    views['w16'] = new Uint16Array(buffer);
    views['w32'] = new Uint32Array(buffer);
    views['f32'] = new Float32Array(buffer);
    views['f64'] = new Float64Array(buffer);
    arr['b'] = buffer;
    arr['v'] = views;
    // ByteArray and Addr are the same thing, so keep an offset if we get
    // casted.
    arr['off'] = 0;
    return arr;
}
window['newByteArr'] = newByteArr;