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annotate src/luan/lib/BasicLib.java @ 64:177cfdc2bdb3

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add type assertions git-svn-id: https://luan-java.googlecode.com/svn/trunk@65 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Thu, 17 Jan 2013 19:29:58 +0000
parents 8ede219cd111
children f86e4f77ef32
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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.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.Luan;
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12 import luan.LuanState;
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13 import luan.LuanTable;
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14 import luan.LuanFunction;
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15 import luan.LuanJavaFunction;
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16 import luan.LuanException;
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17 import luan.LuanSource;
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18 import luan.LuanElement;
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19 import luan.interp.LuanCompiler;
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22 public final class BasicLib {
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24 public static void register(LuanState luan) {
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25 LuanTable global = luan.global();
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26 global.put( "_G", global );
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27 try {
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28 global.put( "assert", new LuanJavaFunction(BasicLib.class.getMethod("assert_",LuanState.class,Object.class,String.class),null) );
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29 add( global, "assert_boolean", LuanState.class, Boolean.TYPE );
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30 add( global, "assert_nil", LuanState.class, Object.class );
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31 add( global, "assert_number", LuanState.class, Number.class );
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32 add( global, "assert_string", LuanState.class, String.class );
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33 add( global, "assert_table", LuanState.class, LuanTable.class );
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34 add( global, "do_file", LuanState.class, String.class );
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35 add( global, "error", LuanState.class, Object.class );
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36 add( global, "get_metatable", LuanState.class, Object.class );
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37 add( global, "ipairs", LuanTable.class );
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38 add( global, "load", LuanState.class, String.class, String.class );
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39 add( global, "load_file", LuanState.class, String.class );
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40 add( global, "pairs", LuanTable.class );
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41 add( global, "print", LuanState.class, new Object[0].getClass() );
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42 add( global, "raw_equal", Object.class, Object.class );
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43 add( global, "raw_get", LuanTable.class, Object.class );
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44 add( global, "raw_len", LuanState.class, Object.class );
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45 add( global, "raw_set", LuanTable.class, Object.class, Object.class );
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46 add( global, "set_metatable", LuanTable.class, LuanTable.class );
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47 add( global, "to_number", Object.class, Integer.class );
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48 add( global, "to_string", LuanState.class, Object.class );
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49 add( global, "type", Object.class );
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50 global.put( "_VERSION", Luan.version );
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51
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52 add( global, "make_standard", LuanState.class );
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53 } catch(NoSuchMethodException e) {
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54 throw new RuntimeException(e);
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55 }
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56 }
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58 private static void add(LuanTable t,String method,Class<?>... parameterTypes) throws NoSuchMethodException {
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59 t.put( method, new LuanJavaFunction(BasicLib.class.getMethod(method,parameterTypes),null) );
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60 }
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62 public static void make_standard(LuanState luan) {
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63 LuanTable global = luan.global();
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64 global.put( "dofile", global.get("do_file") );
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65 global.put( "getmetatable", global.get("get_metatable") );
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66 global.put( "loadfile", global.get("load_file") );
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67 global.put( "rawequal", global.get("raw_equal") );
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68 global.put( "rawget", global.get("raw_get") );
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69 global.put( "rawlen", global.get("raw_len") );
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70 global.put( "rawset", global.get("raw_set") );
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71 global.put( "setmetatable", global.get("set_metatable") );
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72 global.put( "tonumber", global.get("to_number") );
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73 global.put( "tostring", global.get("to_string") );
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74 }
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75
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76 public static void print(LuanState luan,Object... args) throws LuanException {
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77 for( int i=0; i<args.length; i++ ) {
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78 if( i > 0 )
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79 luan.out.print('\t');
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80 luan.out.print( luan.toString(LuanElement.JAVA,args[i]) );
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81 }
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82 luan.out.println();
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83 }
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84
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85 public static String type(Object obj) {
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86 return Luan.type(obj);
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87 }
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88
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89 public static LuanFunction load(LuanState luan,String text,String sourceName) throws LuanException {
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90 return LuanCompiler.compile(luan,new LuanSource(sourceName,text));
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91 }
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93 public static String readAll(Reader in)
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94 throws IOException
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95 {
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96 char[] a = new char[8192];
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97 StringBuilder buf = new StringBuilder();
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98 int n;
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99 while( (n=in.read(a)) != -1 ) {
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100 buf.append(a,0,n);
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101 }
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102 return buf.toString();
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103 }
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104
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105 public static String read(File file)
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106 throws IOException
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107 {
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108 Reader in = new FileReader(file);
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109 String s = readAll(in);
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110 in.close();
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111 return s;
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112 }
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113
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114
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115 public static LuanFunction load_file(LuanState luan,String fileName) throws LuanException {
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116 try {
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117 String src = fileName==null ? readAll(new InputStreamReader(System.in)) : read(new File(fileName));
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118 return load(luan,src,fileName);
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119 } catch(IOException e) {
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120 throw new LuanException(luan,LuanElement.JAVA,e);
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121 }
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122 }
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123
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124 public static Object[] do_file(LuanState luan,String fileName) throws LuanException {
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125 LuanFunction fn = load_file(luan,fileName);
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126 return luan.call(fn,LuanElement.JAVA,null);
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127 }
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128
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129 private static LuanFunction pairs(final Iterator<Map.Entry<Object,Object>> iter) {
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130 return new LuanFunction() {
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131 public Object[] call(LuanState luan,Object[] args) {
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132 if( !iter.hasNext() )
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133 return LuanFunction.EMPTY_RTN;
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134 Map.Entry<Object,Object> entry = iter.next();
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135 return new Object[]{entry.getKey(),entry.getValue()};
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136 }
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137 };
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138 }
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139
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140 public static LuanFunction pairs(LuanTable t) {
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141 return pairs( t.iterator() );
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142 }
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143
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144 public static LuanFunction ipairs(LuanTable t) {
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145 return pairs( t.listIterator() );
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146 }
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147
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148 public static LuanTable get_metatable(LuanState luan,Object obj) {
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149 return luan.getMetatable(obj);
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150 }
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151
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152 public static LuanTable set_metatable(LuanTable table,LuanTable metatable) {
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153 table.setMetatable(metatable);
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154 return table;
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155 }
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156
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157 public static boolean raw_equal(Object v1,Object v2) {
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158 return v1 == v2 || v1 != null && v1.equals(v2);
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159 }
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160
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161 public static Object raw_get(LuanTable table,Object index) {
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162 return table.get(index);
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163 }
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164
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165 public static LuanTable raw_set(LuanTable table,Object index,Object value) {
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166 table.put(index,value);
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167 return table;
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168 }
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169
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170 public static int raw_len(LuanState luan,Object v) throws LuanException {
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171 if( v instanceof String ) {
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172 String s = (String)v;
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173 return s.length();
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174 }
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175 if( v instanceof LuanTable ) {
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176 LuanTable t = (LuanTable)v;
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177 return t.length();
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178 }
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179 throw new LuanException( luan, LuanElement.JAVA, "bad argument #1 to 'raw_len' (table or string expected)" );
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180 }
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181
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182 public static Number to_number(Object e,Integer base) {
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183 return Luan.toNumber(e,base);
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184 }
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185
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186 public static String to_string(LuanState luan,Object v) throws LuanException {
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187 return luan.toString(LuanElement.JAVA,v);
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188 }
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189
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190 public static void error(LuanState luan,Object msg) throws LuanException {
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191 throw new LuanException(luan,LuanElement.JAVA,msg);
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192 }
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193
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194 public static Object assert_(LuanState luan,Object v,String msg) throws LuanException {
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195 if( Luan.toBoolean(v) )
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196 return v;
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197 if( msg == null )
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198 msg = "assertion failed!";
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199 throw new LuanException( luan, LuanElement.JAVA, msg );
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200 }
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201
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202 private static void checkNotNull(LuanState luan,Object v,String expected) throws LuanException {
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203 if( v == null )
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204 throw new LuanException(luan,LuanElement.JAVA,"bad argument #1 ("+expected+" expected, got nil)");
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205 }
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206
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207 public static String assert_string(LuanState luan,String v) throws LuanException {
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208 checkNotNull(luan,v,"string");
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209 return v;
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210 }
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211
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212 public static Number assert_number(LuanState luan,Number v) throws LuanException {
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213 checkNotNull(luan,v,"number");
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214 return v;
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215 }
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216
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217 public static LuanTable assert_table(LuanState luan,LuanTable v) throws LuanException {
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218 checkNotNull(luan,v,"table");
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219 return v;
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220 }
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221
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222 public static boolean assert_boolean(LuanState luan,boolean v) throws LuanException {
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223 return v;
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224 }
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225
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226 public static Object assert_nil(LuanState luan,Object v) throws LuanException {
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227 if( v != null )
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228 throw new LuanException(luan,LuanElement.JAVA,"bad argument #1 (nil expected, got "+Luan.type(v)+")");
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229 return v;
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230 }
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231
2
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232 }