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1 using System;
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2 using System.Collections.Generic;
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3
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4 namespace Jint.Runtime.VM
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5 {
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6 class Scope
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7 {
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8 Frame m_frame;
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9 Dictionary<string,int> m_vars;
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10 Scope m_parent;
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11
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12 public const int ThisRegister = 0;
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13 public const int ScopeRegister = 1;
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14 public const int FirstVarRegsiter = 2;
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15
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16 public Scope (IDictionary<string,int> vars, Frame frame, Scope parent)
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17 {
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18 if (vars == null)
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19 throw new ArgumentNullException ("vars");
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20 if (frame == null)
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21 throw new ArgumentNullException ("frame");
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22
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23 m_vars = new Dictionary<string, int> (vars);
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24 m_frame = frame;
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25 m_parent = parent;
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26 }
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27
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28 public IReference Resolve(string name) {
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29 if (String.IsNullOrEmpty (name))
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30 throw new ArgumentException ("The specified variable name is invalid");
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31
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32 int index;
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33 if (m_vars.TryGetValue (name, out index))
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34 return new ScopeReference (this, index);
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35
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36 if (m_parent != null)
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37 return m_parent.Resolve (name);
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38 else
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39 throw new KeyNotFoundException (String.Format("The specified variable '{0}' isn't found",name));
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40 }
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41 }
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42 }
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43
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