haste-compiler-0.5.4.1: 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;
    }
    return new ByteArray(new ArrayBuffer(n));
}

// Wrap a JS ArrayBuffer into a ByteArray. Truncates the array length to the
// closest multiple of 8 bytes.
function wrapByteArr(buffer) {
    var diff = buffer.byteLength % 8;
    if(diff != 0) {
        var buffer = buffer.slice(0, buffer.byteLength-diff);
    }
    return new ByteArray(buffer);
}

function ByteArray(buffer) {
    var views =
        { 'i8' : new Int8Array(buffer)
        , 'i16': new Int16Array(buffer)
        , 'i32': new Int32Array(buffer)
        , 'w8' : new Uint8Array(buffer)
        , 'w16': new Uint16Array(buffer)
        , 'w32': new Uint32Array(buffer)
        , 'f32': new Float32Array(buffer)
        , 'f64': new Float64Array(buffer)
        };
    this['b'] = buffer;
    this['v'] = views;
    this['off'] = 0;
}
window['newArr'] = newArr;
window['newByteArr'] = newByteArr;
window['wrapByteArr'] = wrapByteArr;
window['ByteArray'] = ByteArray;