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annotate src/luan/lib/BasicLib.java @ 143:fcb81fa2df0d

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handle urls and java resources as files git-svn-id: https://luan-java.googlecode.com/svn/trunk@144 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Fri, 13 Jun 2014 19:04:05 +0000
parents 05f8c21160ef
children f99fd64291b3
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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 java.util.List;
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10 import java.util.ArrayList;
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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 final LuanFunction LOADER = new LuanFunction() {
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25 @Override public Object call(LuanState luan,Object[] args) {
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26 LuanTable module = new LuanTable();
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27 LuanTable global = luan.global();
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28 try {
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29 global.put( "assert", new LuanJavaFunction(BasicLib.class.getMethod("assert_",LuanState.class,Object.class,String.class),null) );
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30 add( global, "assert_boolean", LuanState.class, Boolean.TYPE );
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31 add( global, "assert_nil", LuanState.class, Object.class );
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32 add( global, "assert_number", LuanState.class, Number.class );
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33 add( global, "assert_string", LuanState.class, String.class );
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34 add( global, "assert_table", LuanState.class, LuanTable.class );
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35 add( global, "do_file", LuanState.class, String.class );
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36 add( global, "error", LuanState.class, Object.class );
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37 add( global, "get_metatable", LuanState.class, Object.class );
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38 add( global, "ipairs", LuanState.class, LuanTable.class );
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39 add( global, "load", LuanState.class, String.class, String.class, Boolean.class, Boolean.class );
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40 add( global, "load_file", LuanState.class, String.class );
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41 add( global, "pairs", LuanState.class, LuanTable.class );
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42 add( global, "range", LuanState.class, Double.TYPE, Double.TYPE, Double.class );
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43 add( global, "raw_equal", Object.class, Object.class );
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44 add( global, "raw_get", LuanTable.class, Object.class );
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45 add( global, "raw_len", LuanState.class, Object.class );
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46 add( global, "raw_set", LuanTable.class, Object.class, Object.class );
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47 add( global, "repr", LuanState.class, Object.class );
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48 add( global, "set_metatable", LuanTable.class, LuanTable.class );
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49 add( global, "to_number", Object.class, Integer.class );
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50 add( global, "to_string", LuanState.class, Object.class );
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51 add( global, "type", Object.class );
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52 global.put( "_VERSION", Luan.version );
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53 add( module, "values", new Object[0].getClass() );
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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 return module;
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58 }
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59 };
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60
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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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64
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65 public static String type(Object obj) {
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66 return Luan.type(obj);
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67 }
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68
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69 public static LuanFunction load(LuanState luan,String text,String sourceName,Boolean useGlobal,Boolean allowExpr)
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70 throws LuanException
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71 {
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72 if( allowExpr==null )
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73 allowExpr = false;
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74 if( useGlobal!=null && useGlobal )
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75 return LuanCompiler.compileGlobal(luan,new LuanSource(sourceName,text),allowExpr);
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76 else
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77 return LuanCompiler.compileModule(luan,new LuanSource(sourceName,text),allowExpr);
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78 }
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79
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80 public static LuanFunction load_file(LuanState luan,String fileName) throws LuanException {
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81 try {
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82 String src = fileName==null ? Utils.readAll(new InputStreamReader(System.in)) : IoLib.luanIo(luan,fileName).read_text();
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83 return load(luan,src,fileName,false,false);
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84 } catch(IOException e) {
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85 throw luan.exception(e);
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86 }
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87 }
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89 public static Object do_file(LuanState luan,String fileName) throws LuanException {
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90 LuanFunction fn = load_file(luan,fileName);
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91 return luan.call(fn);
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92 }
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93
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94 private static LuanFunction pairs(final Iterator<Map.Entry<Object,Object>> iter) {
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95 return new LuanFunction() {
109
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96 @Override public Object[] call(LuanState luan,Object[] args) {
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97 if( !iter.hasNext() )
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98 return LuanFunction.NOTHING;
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99 Map.Entry<Object,Object> entry = iter.next();
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100 return new Object[]{entry.getKey(),entry.getValue()};
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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 static LuanFunction pairs(LuanState luan,LuanTable t) throws LuanException {
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106 Utils.checkNotNull(luan,t,"table");
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107 return pairs( t.iterator() );
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108 }
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109
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110 public static LuanFunction ipairs(LuanState luan,LuanTable t) throws LuanException {
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111 Utils.checkNotNull(luan,t,"table");
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112 return pairs( t.listIterator() );
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113 }
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114
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115 public static LuanTable get_metatable(LuanState luan,Object obj) {
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116 return luan.getMetatable(obj);
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117 }
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118
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119 public static LuanTable set_metatable(LuanTable table,LuanTable metatable) {
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120 table.setMetatable(metatable);
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121 return table;
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122 }
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123
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124 public static boolean raw_equal(Object v1,Object v2) {
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125 return v1 == v2 || v1 != null && v1.equals(v2);
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126 }
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127
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128 public static Object raw_get(LuanTable table,Object index) {
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129 return table.get(index);
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130 }
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131
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132 public static LuanTable raw_set(LuanTable table,Object index,Object value) {
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133 table.put(index,value);
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134 return table;
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135 }
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136
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137 public static int raw_len(LuanState luan,Object v) throws LuanException {
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138 if( v instanceof String ) {
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139 String s = (String)v;
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140 return s.length();
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141 }
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142 if( v instanceof LuanTable ) {
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143 LuanTable t = (LuanTable)v;
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144 return t.length();
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145 }
130
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146 throw luan.exception( "bad argument #1 to 'raw_len' (table or string expected)" );
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147 }
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148
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149 public static Number to_number(Object e,Integer base) {
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150 return Luan.toNumber(e,base);
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151 }
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152
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153 public static String to_string(LuanState luan,Object v) throws LuanException {
130
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154 return luan.toString(v);
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155 }
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156
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157 public static void error(LuanState luan,Object msg) throws LuanException {
130
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158 throw luan.exception(msg);
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159 }
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160
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161 public static Object assert_(LuanState luan,Object v,String msg) throws LuanException {
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162 if( Luan.toBoolean(v) )
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163 return v;
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164 if( msg == null )
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165 msg = "assertion failed!";
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166 throw luan.exception( msg );
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167 }
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168
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169 public static String assert_string(LuanState luan,String v) throws LuanException {
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170 Utils.checkNotNull(luan,v,"string");
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171 return v;
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172 }
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173
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174 public static Number assert_number(LuanState luan,Number v) throws LuanException {
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175 Utils.checkNotNull(luan,v,"number");
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176 return v;
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177 }
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178
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179 public static LuanTable assert_table(LuanState luan,LuanTable v) throws LuanException {
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180 Utils.checkNotNull(luan,v,"table");
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181 return v;
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182 }
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183
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184 public static boolean assert_boolean(LuanState luan,boolean v) throws LuanException {
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185 return v;
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186 }
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187
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188 public static Object assert_nil(LuanState luan,Object v) throws LuanException {
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189 if( v != null )
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190 throw luan.exception("bad argument #1 (nil expected, got "+Luan.type(v)+")");
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191 return v;
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192 }
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193
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194 public static String repr(LuanState luan,Object v) throws LuanException {
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195 return luan.repr(v);
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196 }
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197
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198 public static LuanFunction range(LuanState luan,final double from,final double to,Double stepV) throws LuanException {
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199 final double step = stepV==null ? 1.0 : stepV;
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200 if( step == 0.0 )
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201 throw luan.exception("bad argument #3 (step may not be zero)");
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202 return new LuanFunction() {
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203 double v = from;
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204
112
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205 @Override public Object call(LuanState luan,Object[] args) {
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206 if( step > 0.0 && v > to || step < 0.0 && v < to )
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207 return LuanFunction.NOTHING;
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208 double rtn = v;
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209 v += step;
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210 return rtn;
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211 }
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212 };
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213 }
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214
116
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215 public static LuanFunction values(final Object... args) throws LuanException {
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216 return new LuanFunction() {
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217 int i = 0;
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218
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219 @Override public Object call(LuanState luan,Object[] unused) {
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220 if( ++i > args.length )
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221 return LuanFunction.NOTHING;
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222 return new Object[]{i,args[i-1]};
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223 }
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224 };
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225 }
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226
2
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227 }