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13514
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1 /*
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2 * Copyright (c) 2013 Oracle and/or its affiliates. All rights reserved. This
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3 * code is released under a tri EPL/GPL/LGPL license. You can use it,
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4 * redistribute it and/or modify it under the terms of the:
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5 *
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6 * Eclipse Public License version 1.0
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7 * GNU General Public License version 2
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8 * GNU Lesser General Public License version 2.1
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9 */
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10 package com.oracle.truffle.ruby.nodes.objects;
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11
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12 import com.oracle.truffle.api.*;
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13 import com.oracle.truffle.api.frame.*;
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14 import com.oracle.truffle.api.nodes.*;
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15 import com.oracle.truffle.ruby.nodes.*;
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16 import com.oracle.truffle.ruby.runtime.*;
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17 import com.oracle.truffle.ruby.runtime.core.*;
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18
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19 @NodeInfo(shortName = "read-class-variable")
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20 public class ReadClassVariableNode extends RubyNode {
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21
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22 protected final String name;
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23 @Child protected RubyNode module;
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24
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25 public ReadClassVariableNode(RubyContext context, SourceSection sourceSection, String name, RubyNode module) {
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26 super(context, sourceSection);
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27 this.name = name;
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28 this.module = adoptChild(module);
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29 }
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30
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31 @Override
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32 public Object execute(VirtualFrame frame) {
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33 final RubyObject object = (RubyObject) module.execute(frame);
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34
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35 RubyModule moduleObject;
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36
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37 // TODO(CS): this cannot be right
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38
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39 if (object instanceof RubyModule) {
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40 moduleObject = (RubyModule) object;
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41 } else {
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42 moduleObject = object.getRubyClass();
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43 }
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44
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45 final Object value = moduleObject.lookupClassVariable(name);
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46
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47 if (value == null) {
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48 // TODO(CS): is this right?
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49 return NilPlaceholder.INSTANCE;
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50 }
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51
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52 return value;
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53 }
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54
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55 @Override
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56 public Object isDefined(VirtualFrame frame) {
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57 final RubyContext context = getContext();
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58
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59 final RubyObject object = (RubyObject) module.execute(frame);
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60
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61 RubyModule moduleObject;
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62
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63 if (object instanceof RubyModule) {
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64 moduleObject = (RubyModule) object;
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65 } else {
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66 moduleObject = object.getRubyClass();
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67 }
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68
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69 final Object value = moduleObject.lookupClassVariable(name);
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70
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71 if (value == null) {
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72 return NilPlaceholder.INSTANCE;
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73 } else {
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74 return context.makeString("class variable");
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75 }
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76 }
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77
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78 }
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