Mercurial Hosting > luan
annotate src/luan/lib/BasicLib.java @ 40:e3624b7cd603
implement stack trace
git-svn-id: https://luan-java.googlecode.com/svn/trunk@41 21e917c8-12df-6dd8-5cb6-c86387c605b9
author | fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9> |
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date | Fri, 21 Dec 2012 10:45:54 +0000 |
parents | e5bcb1eeafc1 |
children | c53dc854e6cc |
rev | line source |
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1 package luan.lib; |
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2 |
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3 import java.io.File; |
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4 import java.io.Reader; |
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5 import java.io.FileReader; |
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6 import java.io.InputStreamReader; |
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7 import java.io.IOException; |
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8 import java.lang.reflect.Method; |
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9 import java.util.Iterator; |
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10 import java.util.Map; |
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11 import luan.Lua; |
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12 import luan.LuaState; |
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13 import luan.LuaTable; |
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14 import luan.LuaNumber; |
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15 import luan.LuaFunction; |
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16 import luan.LuaJavaFunction; |
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17 import luan.LuaException; |
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18 import luan.LuaSource; |
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19 import luan.LuaElement; |
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20 import luan.interp.LuaCompiler; |
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21 |
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22 |
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23 public final class BasicLib { |
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24 |
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25 public static void register(LuaState lua) { |
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26 LuaTable global = lua.global(); |
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27 global.put( "_G", global ); |
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28 add( global, "do_file", LuaState.class, String.class ); |
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29 add( global, "get_metatable", LuaState.class, Object.class ); |
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30 add( global, "ipairs", LuaTable.class ); |
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31 add( global, "load", LuaState.class, String.class, String.class ); |
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32 add( global, "load_file", LuaState.class, String.class ); |
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33 add( global, "pairs", LuaTable.class ); |
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34 add( global, "print", LuaState.class, new Object[0].getClass() ); |
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35 add( global, "raw_equal", Object.class, Object.class ); |
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36 add( global, "raw_get", LuaTable.class, Object.class ); |
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37 add( global, "raw_len", LuaState.class, Object.class ); |
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38 add( global, "raw_set", LuaTable.class, Object.class, Object.class ); |
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39 add( global, "set_metatable", LuaTable.class, LuaTable.class ); |
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40 add( global, "to_number", Object.class, Integer.class ); |
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41 add( global, "to_string", LuaState.class, Object.class ); |
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42 add( global, "type", Object.class ); |
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43 global.put( "_VERSION", Lua.version ); |
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44 |
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45 add( global, "make_standard", LuaState.class ); |
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46 } |
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47 |
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48 private static void add(LuaTable t,String method,Class<?>... parameterTypes) { |
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49 try { |
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50 t.put( method, new LuaJavaFunction(BasicLib.class.getMethod(method,parameterTypes),null) ); |
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51 } catch(NoSuchMethodException e) { |
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52 throw new RuntimeException(e); |
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53 } |
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54 } |
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55 |
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56 public static void make_standard(LuaState lua) { |
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57 LuaTable global = lua.global(); |
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58 global.put( "dofile", global.get("do_file") ); |
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59 global.put( "getmetatable", global.get("get_metatable") ); |
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60 global.put( "loadfile", global.get("load_file") ); |
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61 global.put( "rawequal", global.get("raw_equal") ); |
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62 global.put( "rawget", global.get("raw_get") ); |
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63 global.put( "rawlen", global.get("raw_len") ); |
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64 global.put( "rawset", global.get("raw_set") ); |
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65 global.put( "setmetatable", global.get("set_metatable") ); |
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66 global.put( "tonumber", global.get("to_number") ); |
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67 global.put( "tostring", global.get("to_string") ); |
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68 } |
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69 |
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70 public static void print(LuaState lua,Object... args) throws LuaException { |
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71 for( int i=0; i<args.length; i++ ) { |
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72 if( i > 0 ) |
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73 System.out.print('\t'); |
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74 System.out.print( lua.toString(LuaElement.JAVA,args[i]) ); |
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75 } |
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76 System.out.println(); |
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77 } |
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78 |
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79 public static String type(Object obj) { |
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80 return Lua.type(obj); |
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81 } |
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82 |
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83 public static LuaFunction load(LuaState lua,String text,String sourceName) throws LuaException { |
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84 return LuaCompiler.compile(lua,new LuaSource(sourceName,text)); |
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85 } |
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86 |
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87 public static String readAll(Reader in) |
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88 throws IOException |
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89 { |
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90 char[] a = new char[8192]; |
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91 StringBuilder buf = new StringBuilder(); |
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92 int n; |
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93 while( (n=in.read(a)) != -1 ) { |
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94 buf.append(a,0,n); |
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95 } |
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96 return buf.toString(); |
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97 } |
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98 |
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99 public static String read(File file) |
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100 throws IOException |
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101 { |
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102 Reader in = new FileReader(file); |
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103 String s = readAll(in); |
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104 in.close(); |
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105 return s; |
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106 } |
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107 |
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108 |
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109 public static LuaFunction load_file(LuaState lua,String fileName) throws LuaException { |
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110 try { |
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111 String src = fileName==null ? readAll(new InputStreamReader(System.in)) : read(new File(fileName)); |
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112 return load(lua,src,fileName); |
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113 } catch(IOException e) { |
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114 throw new LuaException(lua,LuaElement.JAVA,e); |
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115 } |
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116 } |
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117 |
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118 public static Object[] do_file(LuaState lua,String fileName) throws LuaException { |
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119 LuaFunction fn = load_file(lua,fileName); |
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120 return lua.call(fn,LuaElement.JAVA,null); |
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121 } |
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122 |
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123 private static class TableIter { |
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124 private final Iterator<Map.Entry<Object,Object>> iter; |
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125 |
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126 TableIter(Iterator<Map.Entry<Object,Object>> iter) { |
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127 this.iter = iter; |
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128 } |
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129 |
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130 public Object[] next() { |
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131 if( !iter.hasNext() ) |
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132 return LuaFunction.EMPTY_RTN; |
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133 Map.Entry<Object,Object> entry = iter.next(); |
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134 return new Object[]{entry.getKey(),entry.getValue()}; |
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135 } |
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136 } |
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137 private static final Method nextTableIter; |
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138 static { |
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139 try { |
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140 nextTableIter = TableIter.class.getMethod("next"); |
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141 nextTableIter.setAccessible(true); |
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142 } catch(NoSuchMethodException e) { |
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143 throw new RuntimeException(e); |
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144 } |
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145 } |
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146 |
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147 static LuaFunction pairs(Iterator<Map.Entry<Object,Object>> iter) { |
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148 TableIter ti = new TableIter(iter); |
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149 return new LuaJavaFunction(nextTableIter,ti); |
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150 } |
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151 |
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152 public static LuaFunction pairs(LuaTable t) { |
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153 return pairs(t.iterator()); |
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154 } |
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155 |
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156 private static class ArrayIter { |
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157 private final LuaTable t; |
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158 private double i = 0.0; |
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159 |
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160 ArrayIter(LuaTable t) { |
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161 this.t = t; |
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162 } |
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163 |
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164 public Object[] next() { |
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165 LuaNumber n = new LuaNumber(++i); |
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166 Object val = t.get(n); |
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167 return val==null ? LuaFunction.EMPTY_RTN : new Object[]{n,val}; |
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168 } |
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169 } |
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170 private static final Method nextArrayIter; |
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171 static { |
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172 try { |
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173 nextArrayIter = ArrayIter.class.getMethod("next"); |
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174 nextArrayIter.setAccessible(true); |
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175 } catch(NoSuchMethodException e) { |
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176 throw new RuntimeException(e); |
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177 } |
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178 } |
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179 |
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180 public static LuaFunction ipairs(LuaTable t) { |
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181 ArrayIter ai = new ArrayIter(t); |
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182 return new LuaJavaFunction(nextArrayIter,ai); |
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183 } |
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184 |
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185 public static LuaTable get_metatable(LuaState lua,Object obj) { |
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186 return lua.getMetatable(obj); |
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187 } |
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188 |
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189 public static LuaTable set_metatable(LuaTable table,LuaTable metatable) { |
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190 table.setMetatable(metatable); |
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191 return table; |
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192 } |
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193 |
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194 public static boolean raw_equal(Object v1,Object v2) { |
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195 return v1 == v2 || v1 != null && v1.equals(v2); |
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196 } |
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197 |
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198 public static Object raw_get(LuaTable table,Object index) { |
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199 return table.get(index); |
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200 } |
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201 |
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202 public static LuaTable raw_set(LuaTable table,Object index,Object value) { |
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203 table.put(index,value); |
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204 return table; |
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205 } |
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206 |
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207 public static int raw_len(LuaState lua,Object v) throws LuaException { |
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208 if( v instanceof String ) { |
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209 String s = (String)v; |
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210 return s.length(); |
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211 } |
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212 if( v instanceof LuaTable ) { |
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213 LuaTable t = (LuaTable)v; |
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214 return t.length(); |
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215 } |
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216 throw new LuaException( lua, LuaElement.JAVA, "bad argument #1 to 'raw_len' (table or string expected)" ); |
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217 } |
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218 |
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219 public static LuaNumber to_number(Object e,Integer base) { |
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220 return Lua.toNumber(e,base); |
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221 } |
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222 |
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223 public static String to_string(LuaState lua,Object v) throws LuaException { |
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224 return lua.toString(LuaElement.JAVA,v); |
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225 } |
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226 } |