Mercurial Hosting > luan
annotate core/src/luan/impl/LuanStateImpl.java @ 579:f22a09e98b04
clean up LuanState
author | Franklin Schmidt <fschmidt@gmail.com> |
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date | Thu, 16 Jul 2015 15:14:31 -0600 |
parents | 8e51d6071b67 |
children | 859c0dedc8b6 |
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1 package luan.impl; |
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2 |
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3 import java.util.List; |
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4 import java.util.ArrayList; |
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5 import java.util.Map; |
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6 import java.util.HashMap; |
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7 import luan.Luan; |
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8 import luan.LuanState; |
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9 import luan.LuanTable; |
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10 import luan.LuanFunction; |
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11 import luan.LuanException; |
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12 import luan.LuanElement; |
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13 import luan.LuanSource; |
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14 import luan.DeepCloner; |
579 | 15 import luan.StackTraceElement; |
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16 |
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17 |
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18 final class LuanStateImpl extends LuanState { |
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19 |
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20 private static class Frame { |
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21 final Frame previousFrame; |
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22 final Closure closure; |
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23 final Object[] stack; |
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24 final Object[] varArgs; |
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25 UpValue[] downValues = null; |
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26 |
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27 Frame( Frame previousFrame, Closure closure, int stackSize, Object[] varArgs) { |
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28 this.previousFrame = previousFrame; |
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29 this.closure = closure; |
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30 this.stack = new Object[stackSize]; |
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31 this.varArgs = varArgs; |
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32 } |
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33 |
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34 void stackClear(int start,int end) { |
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35 if( downValues != null ) { |
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36 for( int i=start; i<end; i++ ) { |
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37 UpValue downValue = downValues[i]; |
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38 if( downValue != null ) { |
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39 downValue.close(); |
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40 downValues[i] = null; |
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41 } |
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42 } |
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43 } |
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44 for( int i=start; i<end; i++ ) { |
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45 stack[i] = null; |
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46 } |
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47 } |
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48 |
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49 UpValue getUpValue(int index) { |
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50 if( downValues==null ) |
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51 downValues = new UpValue[stack.length]; |
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52 if( downValues[index] == null ) |
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53 downValues[index] = new UpValue(stack,index); |
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54 return downValues[index]; |
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55 } |
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56 } |
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57 |
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58 private Frame frame = null; |
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59 Object returnValues; |
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60 Closure tailFn; |
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61 |
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62 LuanStateImpl() {} |
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63 |
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64 private LuanStateImpl(LuanStateImpl luan) { |
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65 super(luan); |
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66 } |
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67 |
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68 @Override public LuanState shallowClone() { |
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69 // if( frame != null ) |
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70 // throw new IllegalStateException("frame isn't null"); |
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71 return new LuanStateImpl(this); |
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72 } |
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73 |
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74 // returns stack |
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75 Object[] newFrame(Closure closure, int stackSize, Object[] varArgs) { |
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76 returnValues = LuanFunction.NOTHING; |
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77 tailFn = null; |
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78 frame = new Frame(frame,closure,stackSize,varArgs); |
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79 return frame.stack; |
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80 } |
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81 |
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82 void popFrame() { |
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83 returnValues = LuanFunction.NOTHING; |
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84 tailFn = null; |
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85 frame = frame.previousFrame; |
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86 } |
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87 |
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88 Object stackGet(int index) { |
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89 return frame.stack[index]; |
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90 } |
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91 |
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92 void stackSet(int index,Object value) { |
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93 frame.stack[index] = value; |
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94 } |
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95 |
32
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96 void stackClear(int start,int end) { |
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97 frame.stackClear(start,end); |
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98 } |
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99 |
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100 Object[] varArgs() { |
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101 return frame.varArgs; |
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102 } |
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103 |
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104 Closure closure() { |
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105 return frame.closure; |
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106 } |
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107 |
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108 UpValue getUpValue(int index) { |
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109 return frame.getUpValue(index); |
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110 } |
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111 |
503 | 112 @Override public boolean hasJava() { |
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113 if( frame==null ) |
503 | 114 return false; |
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115 return ((LuanTable)frame.closure.upValues()[0].get()).hasJava; |
503 | 116 } |
117 | |
118 @Override public void setJava() { | |
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119 ((LuanTable)frame.closure.upValues()[0].get()).hasJava = true; |
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120 } |
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121 |
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122 @Override public LuanSource currentSource(){ |
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123 if( frame==null ) |
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124 return null; |
460 | 125 return frame.closure.fnDef.el().source; |
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126 } |
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127 |
579 | 128 |
129 | |
130 @Override public boolean isLessThan(Object o1,Object o2) throws LuanException { | |
131 if( o1 instanceof Number && o2 instanceof Number ) { | |
132 Number n1 = (Number)o1; | |
133 Number n2 = (Number)o2; | |
134 return n1.doubleValue() < n2.doubleValue(); | |
135 } | |
136 if( o1 instanceof String && o2 instanceof String ) { | |
137 String s1 = (String)o1; | |
138 String s2 = (String)o2; | |
139 return s1.compareTo(s2) < 0; | |
140 } | |
141 LuanFunction fn = getBinHandler("__lt",o1,o2); | |
142 if( fn != null ) | |
143 return checkBoolean( Luan.first(fn.call(this,new Object[]{o1,o2})) ); | |
144 throw new LuanException(this, "attempt to compare " + Luan.type(o1) + " with " + Luan.type(o2) ); | |
145 } | |
146 | |
147 LuanFunction getBinHandler(String op,Object o1,Object o2) throws LuanException { | |
148 if( o1 instanceof LuanTable ) { | |
149 LuanFunction f1 = getHandlerFunction(op,(LuanTable)o1); | |
150 if( f1 != null ) | |
151 return f1; | |
152 } | |
153 return o2 instanceof LuanTable ? getHandlerFunction(op,(LuanTable)o2) : null; | |
154 } | |
155 | |
156 LuanFunction getHandlerFunction(String op,LuanTable t) throws LuanException { | |
157 Object f = t.getHandler(op); | |
158 if( f == null ) | |
159 return null; | |
160 return checkFunction(f); | |
161 } | |
162 | |
163 Boolean checkBoolean(Object obj,LuanElement el) throws LuanException { | |
164 push(el,null); | |
165 try { | |
166 return checkBoolean(obj); | |
167 } finally { | |
168 pop(); | |
169 } | |
170 } | |
171 | |
172 String toString(Object obj,LuanElement el) throws LuanException { | |
173 push(el,null); | |
174 try { | |
175 return toString(obj); | |
176 } finally { | |
177 pop(); | |
178 } | |
179 } | |
180 | |
181 void push(LuanElement el,String fnName) { | |
182 if( el == null ) throw new RuntimeException(); | |
183 stackTrace.add( new StackTraceElement(el,fnName) ); | |
184 } | |
185 | |
186 void pop() { | |
187 stackTrace.remove(stackTrace.size()-1); | |
188 } | |
189 | |
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190 } |