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annotate src/luan/interp/LuaStateImpl.java @ 37:8a57ebfdfd78

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add JavaLib git-svn-id: https://luan-java.googlecode.com/svn/trunk@38 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Thu, 20 Dec 2012 02:36:07 +0000
parents 2a35154aec14
children e3624b7cd603
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31
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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diff changeset
1 package luan.interp;
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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 luan.Lua;
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6 import luan.LuaState;
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7 import luan.LuaTable;
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8 import luan.LuaFunction;
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9 import luan.MetatableGetter;
36
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10 import luan.LuaException;
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13 final class LuaStateImpl implements LuaState {
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14 private final LuaTable global = new LuaTable();
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15 private final List<MetatableGetter> mtGetters = new ArrayList<MetatableGetter>();
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17 @Override public LuaTable global() {
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18 return global;
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19 }
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21 @Override public String toString(Object obj) throws LuaException {
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22 LuaFunction fn = getHandlerFunction("__tostring",obj);
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23 if( fn != null )
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24 return Lua.checkString( Utils.first( fn.call(this,obj) ) );
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25 if( obj == null )
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26 return "nil";
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27 return obj.toString();
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28 }
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30 @Override public LuaTable getMetatable(Object obj) {
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31 if( obj instanceof LuaTable ) {
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32 LuaTable table = (LuaTable)obj;
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33 return table.getMetatable();
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34 }
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35 for( MetatableGetter mg : mtGetters ) {
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36 LuaTable table = mg.getMetatable(obj);
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37 if( table != null )
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38 return table;
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39 }
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40 return null;
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41 }
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43 public void addMetatableGetter(MetatableGetter mg) {
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44 mtGetters.add(mg);
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45 }
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47 Object getHandler(String op,Object obj) throws LuaException {
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48 LuaTable t = getMetatable(obj);
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49 return t==null ? null : t.get(op);
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50 }
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52 LuaFunction getHandlerFunction(String op,Object obj) throws LuaException {
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53 Object f = getHandler(op,obj);
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54 if( f == null )
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55 return null;
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56 return Lua.checkFunction(f);
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57 }
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59 LuaFunction getBinHandler(String op,Object o1,Object o2) throws LuaException {
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60 LuaFunction f1 = getHandlerFunction(op,o1);
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61 if( f1 != null )
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62 return f1;
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63 return getHandlerFunction(op,o2);
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64 }
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65
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66 final Object arithmetic(String op,Object o1,Object o2) throws LuaException {
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67 LuaFunction fn = getBinHandler(op,o1,o2);
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68 if( fn != null )
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69 return Utils.first(fn.call(this,o1,o2));
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70 String type = Lua.toNumber(o1)==null ? Lua.type(o1) : Lua.type(o2);
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71 throw new LuaException("attempt to perform arithmetic on a "+type+" value");
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72 }
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74
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75 private static class Frame {
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76 final Frame previousFrame;
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77 final LuaClosure closure;
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78 final Object[] stack;
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79 final Object[] varArgs;
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80 UpValue[] downValues = null;
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81
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82 Frame( Frame previousFrame, LuaClosure closure, int stackSize, Object[] varArgs) {
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83 this.previousFrame = previousFrame;
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84 this.closure = closure;
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85 this.stack = new Object[stackSize];
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86 this.varArgs = varArgs;
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87 }
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88
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89 void stackClear(int start,int end) {
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90 if( downValues != null ) {
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91 for( int i=start; i<end; i++ ) {
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92 UpValue downValue = downValues[i];
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93 if( downValue != null ) {
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94 downValue.close();
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95 downValues[i] = null;
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96 }
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97 }
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98 }
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99 for( int i=start; i<end; i++ ) {
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100 stack[i] = null;
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101 }
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102 }
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103
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104 UpValue getUpValue(int index) {
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105 if( downValues==null )
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106 downValues = new UpValue[stack.length];
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107 if( downValues[index] == null )
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108 downValues[index] = new UpValue(stack,index);
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109 return downValues[index];
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110 }
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111 }
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112
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113 private Frame frame = null;
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114 Object[] returnValues;
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115 LuaClosure tailFn;
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116
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117 // returns stack
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118 Object[] newFrame(LuaClosure closure, int stackSize, Object[] varArgs) {
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119 frame = new Frame(frame,closure,stackSize,varArgs);
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120 return frame.stack;
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121 }
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122
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123 void popFrame() {
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124 returnValues = LuaFunction.EMPTY_RTN;
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125 tailFn = null;
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126 frame = frame.previousFrame;
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127 }
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128
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129 Object stackGet(int index) {
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130 return frame.stack[index];
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131 }
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132
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133 void stackSet(int index,Object value) {
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134 frame.stack[index] = value;
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135 }
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136
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137 void stackClear(int start,int end) {
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138 frame.stackClear(start,end);
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139 }
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140
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141 Object[] varArgs() {
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142 return frame.varArgs;
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143 }
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144
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145 LuaClosure closure() {
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146 return frame.closure;
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147 }
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148
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149 UpValue getUpValue(int index) {
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150 return frame.getUpValue(index);
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151 }
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152 }