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annotate src/luan/LuanState.java @ 1202:d3a3ca116e42

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gc site instances
author Franklin Schmidt <fschmidt@gmail.com>
date Mon, 05 Mar 2018 19:30:51 -0700
parents 7ef40e1923b7
children cb422386f6b5
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1 package luan;
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2
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3 import java.io.Closeable;
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4 import java.io.IOException;
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5 import java.lang.ref.Reference;
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6 import java.lang.ref.WeakReference;
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7 import java.util.List;
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8 import java.util.ArrayList;
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9 import java.util.Map;
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10 import java.util.HashMap;
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11 import luan.impl.LuanCompiler;
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12 import luan.modules.BasicLuan;
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13 import luan.modules.JavaLuan;
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15
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16 public final class LuanState implements LuanCloneable {
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17 public LuanJavaOk javaOk;
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18 private Map registry;
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19 private final List<Reference<Closeable>> onClose = new ArrayList<Reference<Closeable>>();
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20 public boolean isLocked = false;
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22 public LuanState() {
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23 javaOk = new LuanJavaOk();
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24 registry = new HashMap();
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25 }
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27 private LuanState(LuanState luan) {}
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28
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29 @Override public LuanState shallowClone() {
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30 return new LuanState(this);
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31 }
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32
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33 @Override public void deepenClone(LuanCloneable dc,LuanCloner cloner) {
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34 LuanState clone = (LuanState)dc;
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35 clone.registry = cloner.clone(registry);
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36 clone.javaOk = (LuanJavaOk)cloner.clone(javaOk);
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37 if( cloner.type == LuanCloner.Type.INCREMENTAL )
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38 isLocked = true;
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39 }
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40
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41 public Map registry() {
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42 return registry;
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43 }
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44
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45 public void onClose(Closeable c) {
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46 onClose.add(new WeakReference<Closeable>(c));
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47 }
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48
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49 public void close() throws IOException {
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50 for( Reference<Closeable> ref : onClose ) {
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51 Closeable c = ref.get();
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52 if( c != null )
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53 c.close();
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54 }
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55 onClose.clear();
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56 }
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57
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58 protected void finalize() throws Throwable {
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59 close();
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60 }
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61
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62 public final Object eval(String cmd,Object... args) throws LuanException {
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63 return Luan.load(cmd,"eval").call(this,args);
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64 }
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65 /*
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66 public final Object eval(String cmd,LuanTable env) throws LuanException {
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67 LuanFunction fn = BasicLuan.load(this,cmd,"eval",env,true);
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68 return fn.call(this);
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69 }
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70 */
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71
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72 public String toString(Object obj) throws LuanException {
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73 if( obj instanceof LuanTable ) {
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74 LuanTable tbl = (LuanTable)obj;
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75 return tbl.toString(this);
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76 }
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77 if( obj == null )
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78 return "nil";
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79 if( obj instanceof Number )
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80 return Luan.toString((Number)obj);
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81 if( obj instanceof byte[] )
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82 return "binary: " + Integer.toHexString(obj.hashCode());
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83 return obj.toString();
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84 }
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85
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86 public Object index(Object obj,Object key) throws LuanException {
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87 if( obj instanceof LuanTable ) {
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88 LuanTable tbl = (LuanTable)obj;
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89 return tbl.get(this,key);
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90 }
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91 if( obj != null && javaOk.ok )
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92 return JavaLuan.__index(this,obj,key);
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93 throw new LuanException("attempt to index a " + Luan.type(obj) + " value" );
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94 }
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95
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96 /*
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97 public Number checkNumber(Object obj) throws LuanException {
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98 if( obj instanceof Number )
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99 return (Number)obj;
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100 throw new LuanException( "attempt to perform arithmetic on '"+context()+"' (a " + Luan.type(obj) + " value)" );
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101 }
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102 */
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103
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104
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105 public boolean isLessThan(Object o1,Object o2) throws LuanException {
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106 if( o1 instanceof Number && o2 instanceof Number ) {
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107 Number n1 = (Number)o1;
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108 Number n2 = (Number)o2;
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109 return n1.doubleValue() < n2.doubleValue();
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110 }
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111 if( o1 instanceof String && o2 instanceof String ) {
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112 String s1 = (String)o1;
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113 String s2 = (String)o2;
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114 return s1.compareTo(s2) < 0;
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115 }
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116 LuanFunction fn = getBinHandler("__lt",o1,o2);
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117 if( fn != null )
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118 return Luan.checkBoolean( Luan.first(fn.call(this,new Object[]{o1,o2})) );
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119 throw new LuanException( "attempt to compare " + Luan.type(o1) + " with " + Luan.type(o2) );
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120 }
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121
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122 public LuanFunction getBinHandler(String op,Object o1,Object o2) throws LuanException {
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123 if( o1 instanceof LuanTable ) {
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124 LuanFunction f1 = getHandlerFunction(op,(LuanTable)o1);
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125 if( f1 != null )
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126 return f1;
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127 }
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128 return o2 instanceof LuanTable ? getHandlerFunction(op,(LuanTable)o2) : null;
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129 }
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130
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131 public LuanFunction getHandlerFunction(String op,LuanTable t) throws LuanException {
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132 Object f = t.getHandler(this,op);
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133 if( f == null )
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134 return null;
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135 return Luan.checkFunction(f);
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136 }
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137 }