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annotate src/luan/lib/BasicLib.java @ 86:6db8f286fa6c

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_ENV is per module, not global git-svn-id: https://luan-java.googlecode.com/svn/trunk@87 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Wed, 27 Feb 2013 08:03:51 +0000
parents 4bf3d0c0b6b9
children 6ca02b188dba
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1 package luan.lib;
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3 import java.io.File;
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4 import java.io.InputStreamReader;
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5 import java.io.IOException;
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6 import java.lang.reflect.Method;
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7 import java.util.Iterator;
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8 import java.util.Map;
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9 import luan.Luan;
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10 import luan.LuanState;
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11 import luan.LuanTable;
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12 import luan.LuanFunction;
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13 import luan.LuanLoader;
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14 import luan.LuanJavaFunction;
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15 import luan.LuanException;
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16 import luan.LuanSource;
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17 import luan.LuanElement;
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18 import luan.interp.LuanCompiler;
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21 public final class BasicLib {
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23 public static final String NAME = "basic";
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25 public static final LuanLoader LOADER = new LuanLoader() {
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26 @Override protected void load(LuanState luan) {
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27 LuanTable module = new LuanTable();
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28 LuanTable global = new LuanTable();
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29 module.put( LuanState._G, global );
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30 try {
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31 global.put( "assert", new LuanJavaFunction(BasicLib.class.getMethod("assert_",LuanState.class,Object.class,String.class),null) );
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32 add( global, "assert_boolean", LuanState.class, Boolean.TYPE );
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33 add( global, "assert_nil", LuanState.class, Object.class );
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34 add( global, "assert_number", LuanState.class, Number.class );
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35 add( global, "assert_string", LuanState.class, String.class );
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36 add( global, "assert_table", LuanState.class, LuanTable.class );
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37 add( global, "do_file", LuanState.class, String.class, LuanTable.class );
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38 add( global, "error", LuanState.class, Object.class );
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39 add( global, "get_metatable", LuanState.class, Object.class );
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40 add( global, "ipairs", LuanState.class, LuanTable.class );
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41 add( global, "load", LuanState.class, String.class, String.class, LuanTable.class );
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42 add( global, "load_file", LuanState.class, String.class, LuanTable.class );
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43 add( global, "pairs", LuanState.class, LuanTable.class );
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44 add( global, "print", LuanState.class, new Object[0].getClass() );
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45 add( global, "raw_equal", Object.class, Object.class );
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46 add( global, "raw_get", LuanTable.class, Object.class );
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47 add( global, "raw_len", LuanState.class, Object.class );
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48 add( global, "raw_set", LuanTable.class, Object.class, Object.class );
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49 add( global, "set_metatable", LuanTable.class, LuanTable.class );
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50 add( global, "to_number", Object.class, Integer.class );
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51 add( global, "to_string", LuanState.class, Object.class );
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52 add( global, "type", Object.class );
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53 global.put( "_VERSION", Luan.version );
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54 } catch(NoSuchMethodException e) {
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55 throw new RuntimeException(e);
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56 }
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57 luan.loaded().put(NAME,module);
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58 }
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59 };
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61 private static void add(LuanTable t,String method,Class<?>... parameterTypes) throws NoSuchMethodException {
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62 t.put( method, new LuanJavaFunction(BasicLib.class.getMethod(method,parameterTypes),null) );
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63 }
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65 public static void print(LuanState luan,Object... args) throws LuanException {
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66 for( int i=0; i<args.length; i++ ) {
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67 if( i > 0 )
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68 luan.out.print('\t');
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69 luan.out.print( luan.toString(LuanElement.JAVA,args[i]) );
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70 }
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71 luan.out.println();
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72 }
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74 public static String type(Object obj) {
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75 return Luan.type(obj);
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76 }
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78 public static LuanFunction load(LuanState luan,String text,String sourceName,LuanTable env) throws LuanException {
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79 return LuanCompiler.compile(luan,new LuanSource(sourceName,text),env);
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80 }
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83 public static LuanFunction load_file(LuanState luan,String fileName,LuanTable env) throws LuanException {
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84 try {
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85 String src = fileName==null ? Utils.readAll(new InputStreamReader(System.in)) : Utils.read(new File(fileName));
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86 return load(luan,src,fileName,env);
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87 } catch(IOException e) {
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88 throw new LuanException(luan,LuanElement.JAVA,e);
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89 }
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90 }
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92 public static Object[] do_file(LuanState luan,String fileName,LuanTable env) throws LuanException {
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93 LuanFunction fn = load_file(luan,fileName,env);
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94 return luan.call(fn,LuanElement.JAVA,null);
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95 }
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96
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97 private static LuanFunction pairs(final Iterator<Map.Entry<Object,Object>> iter) {
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98 return new LuanFunction() {
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99 public Object[] call(LuanState luan,Object[] args) {
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100 if( !iter.hasNext() )
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101 return LuanFunction.EMPTY;
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102 Map.Entry<Object,Object> entry = iter.next();
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103 return new Object[]{entry.getKey(),entry.getValue()};
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104 }
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105 };
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106 }
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107
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108 public static LuanFunction pairs(LuanState luan,LuanTable t) throws LuanException {
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109 Utils.checkNotNull(luan,t,"table");
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110 return pairs( t.iterator() );
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111 }
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112
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113 public static LuanFunction ipairs(LuanState luan,LuanTable t) throws LuanException {
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114 Utils.checkNotNull(luan,t,"table");
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115 return pairs( t.listIterator() );
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116 }
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117
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118 public static LuanTable get_metatable(LuanState luan,Object obj) {
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119 return luan.getMetatable(obj);
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120 }
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121
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122 public static LuanTable set_metatable(LuanTable table,LuanTable metatable) {
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123 table.setMetatable(metatable);
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124 return table;
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125 }
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126
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127 public static boolean raw_equal(Object v1,Object v2) {
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128 return v1 == v2 || v1 != null && v1.equals(v2);
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129 }
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130
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131 public static Object raw_get(LuanTable table,Object index) {
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132 return table.get(index);
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133 }
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134
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135 public static LuanTable raw_set(LuanTable table,Object index,Object value) {
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136 table.put(index,value);
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137 return table;
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138 }
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139
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140 public static int raw_len(LuanState luan,Object v) throws LuanException {
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141 if( v instanceof String ) {
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142 String s = (String)v;
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143 return s.length();
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144 }
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145 if( v instanceof LuanTable ) {
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146 LuanTable t = (LuanTable)v;
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147 return t.length();
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148 }
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149 throw new LuanException( luan, LuanElement.JAVA, "bad argument #1 to 'raw_len' (table or string expected)" );
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150 }
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151
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152 public static Number to_number(Object e,Integer base) {
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153 return Luan.toNumber(e,base);
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154 }
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155
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156 public static String to_string(LuanState luan,Object v) throws LuanException {
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157 return luan.toString(LuanElement.JAVA,v);
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158 }
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159
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160 public static void error(LuanState luan,Object msg) throws LuanException {
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161 throw new LuanException(luan,LuanElement.JAVA,msg);
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162 }
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163
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164 public static Object assert_(LuanState luan,Object v,String msg) throws LuanException {
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165 if( Luan.toBoolean(v) )
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166 return v;
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167 if( msg == null )
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168 msg = "assertion failed!";
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169 throw new LuanException( luan, LuanElement.JAVA, msg );
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170 }
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171
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172 public static String assert_string(LuanState luan,String v) throws LuanException {
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173 Utils.checkNotNull(luan,v,"string");
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174 return v;
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175 }
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176
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177 public static Number assert_number(LuanState luan,Number v) throws LuanException {
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178 Utils.checkNotNull(luan,v,"number");
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179 return v;
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180 }
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181
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182 public static LuanTable assert_table(LuanState luan,LuanTable v) throws LuanException {
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183 Utils.checkNotNull(luan,v,"table");
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184 return v;
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185 }
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186
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187 public static boolean assert_boolean(LuanState luan,boolean v) throws LuanException {
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188 return v;
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189 }
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190
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191 public static Object assert_nil(LuanState luan,Object v) throws LuanException {
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192 if( v != null )
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193 throw new LuanException(luan,LuanElement.JAVA,"bad argument #1 (nil expected, got "+Luan.type(v)+")");
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194 return v;
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195 }
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196
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197 }