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VariableLocator.cs

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/*----------------------------------------------------------

This Source Code Form is subject to the terms of the

Mozilla Public License, v.2.0. If a copy of the MPL

was not distributed with this file, You can obtain one

at http://mozilla.org/MPL/2.0/.

----------------------------------------------------------*/

using System;

using System.Collections;

using System.Collections.Generic;

namespace OneScript.DebugProtocol

{

public interface IVariableLocator : IEnumerable<Variable>

{

int Count { get; }

Variable this[int index] { get; }

void Hydrate(IDebuggerService process);

IVariableLocator CreateChildLocator(int variableIndex);

}

public class VariableLocator : IVariableLocator

{

private int[] _path;

private readonly int _threadId;

private readonly int _stackFrameIndex;

private Variable[] _variables;

private VariableLocator(VariableLocator parent, int variableIndex)

{

_stackFrameIndex = parent._stackFrameIndex;

_threadId = parent._threadId;

_path = new int[parent._path.Length + 1];

Array.Copy(parent._path, _path, parent._path.Length);

_path[parent._path.Length] = variableIndex;

}

public VariableLocator(int threadId, int stackFrameIndex, int variableIndex)

{

_threadId = threadId;

_stackFrameIndex = stackFrameIndex;

_path = new int[] { variableIndex };

}

public Variable this[int index]

{

get

{

ThrowIfNoVariables();

return _variables[index];

}

}

public int Count

{

get

{

ThrowIfNoVariables();

return _variables.Length;

}

}

public IEnumerator<Variable> GetEnumerator()

{

ThrowIfNoVariables();

return ((IEnumerable<Variable>) _variables).GetEnumerator();

}

IEnumerator IEnumerable.GetEnumerator()

{

return GetEnumerator();

}

private void ThrowIfNoVariables()

{

if (_variables == null)

throw new InvalidOperationException("No variables aquired yet");

}

void IVariableLocator.Hydrate(IDebuggerService process)

{

if(_variables != null)

return;

var variables = process.GetVariables(_threadId, _stackFrameIndex, _path);

_variables = variables;

}

IVariableLocator IVariableLocator.CreateChildLocator(int variableIndex)

{

return new VariableLocator(this, variableIndex);

}

}

}