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ObjArray.cs
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//------------------------------------------------------------------------------
// <license file="ObjArray.cs">
//
// The use and distribution terms for this software are contained in the file
// named 'LICENSE', which can be found in the resources directory of this
// distribution.
//
// By using this software in any fashion, you are agreeing to be bound by the
// terms of this license.
//
// </license>
//------------------------------------------------------------------------------
using System;
using System.Runtime.InteropServices;
namespace EcmaScript.NET.Collections
{
/// <summary>Implementation of resizable array with focus on minimizing memory usage by storing few initial array elements in object fields. Can also be used as a stack.</summary>
public class ObjArray
{
virtual public bool Sealed
{
get
{
return zealed;
}
}
virtual public bool Empty
{
get
{
return m_Size == 0;
}
}
virtual public int Size
{
set
{
if (value < 0)
throw new ArgumentException ();
if (zealed)
throw onSeledMutation ();
int N = m_Size;
if (value < N) {
for (int i = value; i != N; ++i) {
SetImpl (i, (object)null);
}
}
else if (value > N) {
if (value > FIELDS_STORE_SIZE) {
ensureCapacity (value);
}
}
m_Size = value;
}
}
public ObjArray ()
{
}
public void seal ()
{
zealed = true;
}
public int size ()
{
return m_Size;
}
public object Get (int index)
{
if (!(0 <= index && index < m_Size))
throw onInvalidIndex (index, m_Size);
return GetImpl (index);
}
public void Set (int index, object value)
{
if (!(0 <= index && index < m_Size))
throw onInvalidIndex (index, m_Size);
if (zealed)
throw onSeledMutation ();
SetImpl (index, value);
}
private object GetImpl (int index)
{
switch (index) {
case 0:
return f0;
case 1:
return f1;
case 2:
return f2;
case 3:
return f3;
case 4:
return f4;
}
return data [index - FIELDS_STORE_SIZE];
}
private void SetImpl (int index, object value)
{
switch (index) {
case 0:
f0 = value;
break;
case 1:
f1 = value;
break;
case 2:
f2 = value;
break;
case 3:
f3 = value;
break;
case 4:
f4 = value;
break;
default:
data [index - FIELDS_STORE_SIZE] = value;
break;
}
}
public virtual int indexOf (object obj)
{
int N = m_Size;
for (int i = 0; i != N; ++i) {
object current = GetImpl (i);
if (current == obj || (current != null && current.Equals (obj))) {
return i;
}
}
return -1;
}
public virtual int lastIndexOf (object obj)
{
for (int i = m_Size; i != 0; ) {
--i;
object current = GetImpl (i);
if (current == obj || (current != null && current.Equals (obj))) {
return i;
}
}
return -1;
}
public object peek ()
{
int N = m_Size;
if (N == 0)
throw onEmptyStackTopRead ();
return GetImpl (N - 1);
}
public object pop ()
{
if (zealed)
throw onSeledMutation ();
int N = m_Size;
--N;
object top;
switch (N) {
case -1:
throw onEmptyStackTopRead ();
case 0:
top = f0;
f0 = null;
break;
case 1:
top = f1;
f1 = null;
break;
case 2:
top = f2;
f2 = null;
break;
case 3:
top = f3;
f3 = null;
break;
case 4:
top = f4;
f4 = null;
break;
default:
top = data [N - FIELDS_STORE_SIZE];
data [N - FIELDS_STORE_SIZE] = null;
break;
}
m_Size = N;
return top;
}
public void push (object value)
{
add (value);
}
public void add (object value)
{
if (zealed)
throw onSeledMutation ();
int N = m_Size;
if (N >= FIELDS_STORE_SIZE) {
ensureCapacity (N + 1);
}
m_Size = N + 1;
SetImpl (N, value);
}
public void add (int index, object value)
{
int N = m_Size;
if (!(0 <= index && index <= N))
throw onInvalidIndex (index, N + 1);
if (zealed)
throw onSeledMutation ();
object tmp;
switch (index) {
case 0:
if (N == 0) {
f0 = value;
break;
}
tmp = f0;
f0 = value;
value = tmp;
goto case 1;
case 1:
if (N == 1) {
f1 = value;
break;
}
tmp = f1;
f1 = value;
value = tmp;
goto case 2;
case 2:
if (N == 2) {
f2 = value;
break;
}
tmp = f2;
f2 = value;
value = tmp;
goto case 3;
case 3:
if (N == 3) {
f3 = value;
break;
}
tmp = f3;
f3 = value;
value = tmp;
goto case 4;
case 4:
if (N == 4) {
f4 = value;
break;
}
tmp = f4;
f4 = value;
value = tmp;
index = FIELDS_STORE_SIZE;
goto default;
default:
ensureCapacity (N + 1);
if (index != N) {
Array.Copy (data, index - FIELDS_STORE_SIZE, data, index - FIELDS_STORE_SIZE + 1, N - index);
}
data [index - FIELDS_STORE_SIZE] = value;
break;
}
m_Size = N + 1;
}
public void remove (int index)
{
int N = m_Size;
if (!(0 <= index && index < N))
throw onInvalidIndex (index, N);
if (zealed)
throw onSeledMutation ();
--N;
switch (index) {
case 0:
if (N == 0) {
f0 = null;
break;
}
f0 = f1;
goto case 1;
case 1:
if (N == 1) {
f1 = null;
break;
}
f1 = f2;
goto case 2;
case 2:
if (N == 2) {
f2 = null;
break;
}
f2 = f3;
goto case 3;
case 3:
if (N == 3) {
f3 = null;
break;
}
f3 = f4;
goto case 4;
case 4:
if (N == 4) {
f4 = null;
break;
}
f4 = data [0];
index = FIELDS_STORE_SIZE;
goto default;
default:
if (index != N) {
Array.Copy (data, index - FIELDS_STORE_SIZE + 1, data, index - FIELDS_STORE_SIZE, N - index);
}
data [N - FIELDS_STORE_SIZE] = null;
break;
}
m_Size = N;
}
public void clear ()
{
if (zealed)
throw onSeledMutation ();
int N = m_Size;
for (int i = 0; i != N; ++i) {
SetImpl (i, (object)null);
}
m_Size = 0;
}
public object [] ToArray ()
{
object [] array = new object [m_Size];
ToArray (array, 0);
return array;
}
public void ToArray (object [] array)
{
ToArray (array, 0);
}
public void ToArray (object [] array, int offset)
{
int N = m_Size;
switch (N) {
default:
Array.Copy (data, 0, array, offset + FIELDS_STORE_SIZE, N - FIELDS_STORE_SIZE);
goto case 5;
case 5:
array [offset + 4] = f4;
goto case 4;
case 4:
array [offset + 3] = f3;
goto case 3;
case 3:
array [offset + 2] = f2;
goto case 2;
case 2:
array [offset + 1] = f1;
goto case 1;
case 1:
array [offset + 0] = f0;
goto case 0;
case 0:
break;
}
}
private void ensureCapacity (int minimalCapacity)
{
int required = minimalCapacity - FIELDS_STORE_SIZE;
if (required <= 0)
throw new ArgumentException ();
if (data == null) {
int alloc = FIELDS_STORE_SIZE * 2;
if (alloc < required) {
alloc = required;
}
data = new object [alloc];
}
else {
int alloc = data.Length;
if (alloc < required) {
if (alloc <= FIELDS_STORE_SIZE) {
alloc = FIELDS_STORE_SIZE * 2;
}
else {
alloc *= 2;
}
if (alloc < required) {
alloc = required;
}
object [] tmp = new object [alloc];
if (m_Size > FIELDS_STORE_SIZE) {
Array.Copy (data, 0, tmp, 0, m_Size - FIELDS_STORE_SIZE);
}
data = tmp;
}
}
}
private static Exception onInvalidIndex (int index, int upperBound)
{
// \u2209 is "NOT ELEMENT OF"
string msg = index + " \u2209 [0, " + upperBound + ')';
throw new System.IndexOutOfRangeException (msg);
}
private static Exception onEmptyStackTopRead ()
{
throw new Exception ("Empty stack");
}
private static Exception onSeledMutation ()
{
throw new Exception ("Attempt to modify sealed array");
}
// Number of data elements
private int m_Size;
private bool zealed;
private const int FIELDS_STORE_SIZE = 5;
private object f0, f1, f2, f3, f4;
private object [] data;
}
}