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annotate src/luan/LuanState.java @ 75:aa7538ae5fb6

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can now load modules from classpath git-svn-id: https://luan-java.googlecode.com/svn/trunk@76 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Wed, 13 Feb 2013 09:19:15 +0000
parents f003338d503b
children 4bf3d0c0b6b9
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48
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1 package luan;
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2
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3 import java.io.InputStream;
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4 import java.io.PrintStream;
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5 import java.util.List;
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6 import java.util.ArrayList;
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7 import luan.interp.LuanCompiler;
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8 import luan.lib.BasicLib;
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9 import luan.lib.PackageLib;
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10 import luan.lib.JavaLib;
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11 import luan.lib.MathLib;
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12 import luan.lib.StringLib;
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13 import luan.lib.TableLib;
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14 import luan.lib.HtmlLib;
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17 public abstract class LuanState {
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18
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19 public final LuanTable global = new LuanTable();
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20 public final LuanTable loaded = new LuanTable();
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21 public final LuanTable preload = new LuanTable();
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23 public InputStream in = System.in;
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24 public PrintStream out = System.out;
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25 public PrintStream err = System.err;
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27 private final List<MetatableGetter> mtGetters = new ArrayList<MetatableGetter>();
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28 final List<StackTraceElement> stackTrace = new ArrayList<StackTraceElement>();
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31 public Object get(String name) {
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32 String[] a = name.split("\\.");
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33 LuanTable t = global;
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34 for( int i=0; i<a.length-1; i++ ) {
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35 Object obj = t.get(a[i]);
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36 if( !(obj instanceof LuanTable) )
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37 return null;
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38 t = (LuanTable)obj;
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39 }
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40 return t.get(a[a.length-1]);
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41 }
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42
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43 public Object set(String name,Object value) {
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44 String[] a = name.split("\\.");
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45 LuanTable t = global;
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46 for( int i=0; i<a.length-1; i++ ) {
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47 Object obj = t.get(a[i]);
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48 if( !(obj instanceof LuanTable) )
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49 return null;
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50 t = (LuanTable)obj;
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51 }
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52 return t.put(a[a.length-1],value);
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53 }
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55 public void load(LuanFunction loader,String modName) throws LuanException {
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56 Object mod = Luan.first(call(loader,LuanElement.JAVA,"loader",modName));
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57 if( mod == null )
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58 mod = true;
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59 loaded.put(modName,mod);
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60 if( mod instanceof LuanTable )
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61 global.put(modName,mod);
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62 }
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63
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64 public static LuanState newStandard() {
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65 try {
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66 LuanState luan = LuanCompiler.newLuanState();
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67 luan.load(BasicLib.LOADER,BasicLib.NAME);
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68 luan.load(PackageLib.LOADER,PackageLib.NAME);
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69 luan.load(JavaLib.LOADER,JavaLib.NAME);
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70 luan.load(MathLib.LOADER,MathLib.NAME);
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71 luan.load(StringLib.LOADER,StringLib.NAME);
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72 luan.load(TableLib.LOADER,TableLib.NAME);
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73 luan.load(HtmlLib.LOADER,HtmlLib.NAME);
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74 return luan;
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75 } catch(LuanException e) {
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76 throw new RuntimeException(e);
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77 }
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78 }
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80 public Object[] eval(String cmd,String sourceName) throws LuanException {
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81 LuanFunction fn = BasicLib.load(this,cmd,sourceName);
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82 return call(fn,null,null);
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83 }
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85
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86 public final LuanTable getMetatable(Object obj) {
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87 if( obj instanceof LuanTable ) {
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88 LuanTable table = (LuanTable)obj;
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89 return table.getMetatable();
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90 }
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91 for( MetatableGetter mg : mtGetters ) {
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92 LuanTable table = mg.getMetatable(obj);
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93 if( table != null )
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94 return table;
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95 }
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96 return null;
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97 }
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98
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99 public final void addMetatableGetter(MetatableGetter mg) {
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100 mtGetters.add(mg);
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101 }
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102
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103 public Object[] call(LuanFunction fn,LuanElement calledFrom,String fnName,Object... args) throws LuanException {
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104 stackTrace.add( new StackTraceElement(calledFrom,fnName) );
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105 try {
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106 return fn.call(this,args);
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107 } finally {
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108 stackTrace.remove(stackTrace.size()-1);
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109 }
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110 }
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111
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112 public final String checkString(LuanElement el,Object obj) throws LuanException {
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113 String s = Luan.asString(obj);
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114 if( s == null )
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115 throw new LuanException( this, el, "attempt to use a " + Luan.type(obj) + " as a string" );
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116 return s;
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117 }
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118
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119 public final Number checkNumber(LuanElement el,Object obj) throws LuanException {
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120 Number n = Luan.toNumber(obj);
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121 if( n == null )
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122 throw new LuanException( this, el, "attempt to perform arithmetic on a " + Luan.type(obj) + " value" );
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123 return n;
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124 }
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125
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126 public final LuanFunction checkFunction(LuanElement el,Object obj) throws LuanException {
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127 if( obj instanceof LuanFunction )
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128 return (LuanFunction)obj;
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129 throw new LuanException( this, el, "attempt to call a " + Luan.type(obj) + " value" );
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130 }
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131
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132 public final String toString(LuanElement el,Object obj) throws LuanException {
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133 LuanFunction fn = getHandlerFunction(el,"__tostring",obj);
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134 if( fn != null )
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135 return checkString( el, Luan.first( call(fn,el,"__tostring",obj) ) );
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136 return Luan.toString(obj);
48
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137 }
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138
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139 public final LuanFunction getHandlerFunction(LuanElement el,String op,Object obj) throws LuanException {
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140 Object f = getHandler(op,obj);
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141 if( f == null )
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142 return null;
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143 return checkFunction(el,f);
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144 }
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145
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146 public final Object getHandler(String op,Object obj) {
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147 LuanTable t = getMetatable(obj);
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148 return t==null ? null : t.get(op);
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149 }
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150
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151
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152 public final LuanFunction getBinHandler(LuanElement el,String op,Object o1,Object o2) throws LuanException {
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153 LuanFunction f1 = getHandlerFunction(el,op,o1);
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154 if( f1 != null )
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155 return f1;
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156 return getHandlerFunction(el,op,o2);
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157 }
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158
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159 public final boolean isLessThan(LuanElement el,Object o1,Object o2) throws LuanException {
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160 if( o1 instanceof Number && o2 instanceof Number ) {
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161 Number n1 = (Number)o1;
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162 Number n2 = (Number)o2;
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163 return n1.doubleValue() < n2.doubleValue();
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164 }
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165 if( o1 instanceof String && o2 instanceof String ) {
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166 String s1 = (String)o1;
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167 String s2 = (String)o2;
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168 return s1.compareTo(s2) < 0;
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169 }
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170 LuanFunction fn = getBinHandler(el,"__lt",o1,o2);
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171 if( fn != null )
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172 return Luan.toBoolean( Luan.first(call(fn,el,"__lt",o1,o2)) );
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173 throw new LuanException( this, el, "attempt to compare " + Luan.type(o1) + " with " + Luan.type(o2) );
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174 }
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175 }