Mercurial Hosting > luan
annotate src/luan/Luan.java @ 1464:465b4a0dae4a
empty list vs map
author | Franklin Schmidt <fschmidt@gmail.com> |
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date | Fri, 03 Apr 2020 10:04:52 -0600 |
parents | 219f2b937f2b |
children | e1a13e707bf3 |
rev | line source |
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start Luan
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1 package luan; |
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2 |
1454 | 3 import java.lang.reflect.Array; |
1424 | 4 import java.io.IOException; |
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5 import java.util.List; |
1113 | 6 import java.util.ArrayList; |
7 import java.util.Map; | |
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8 import java.util.HashMap; |
1113 | 9 import java.util.LinkedHashMap; |
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10 import java.util.Iterator; |
1113 | 11 import java.util.Arrays; |
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12 import java.util.Set; |
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13 import goodjava.logging.Logger; |
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14 import goodjava.logging.LoggerFactory; |
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15 import luan.modules.JavaLuan; |
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16 import luan.modules.PackageLuan; |
1424 | 17 import luan.modules.IoLuan; |
1393 | 18 import luan.modules.logging.LuanLogger; |
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19 import luan.impl.LuanCompiler; |
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20 |
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21 |
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22 public final class Luan implements LuanCloneable { |
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23 private static final Logger logger = LoggerFactory.getLogger(Luan.class); |
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24 |
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25 private final List<LuanClosure> stack = new ArrayList<LuanClosure>(); |
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26 private Map registry; |
1335 | 27 private boolean isLocked = false; |
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28 |
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29 public Luan() { |
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30 registry = new HashMap(); |
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31 } |
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32 |
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33 private Luan(Luan luan) {} |
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34 |
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35 @Override public Luan shallowClone() { |
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36 return new Luan(this); |
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37 } |
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38 |
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39 @Override public void deepenClone(LuanCloneable dc,LuanCloner cloner) { |
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40 Luan clone = (Luan)dc; |
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41 clone.registry = cloner.clone(registry); |
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42 if( cloner.type == LuanCloner.Type.INCREMENTAL ) |
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43 isLocked = true; |
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44 } |
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45 |
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46 public LuanClosure peek() { |
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47 return peek(1); |
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48 } |
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49 |
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50 public LuanClosure peek(int i) { |
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51 int n = stack.size(); |
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52 return n < i ? null : stack.get(n-i); |
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53 } |
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54 |
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55 void push(LuanClosure closure) { |
1335 | 56 if( isLocked ) |
57 throw new RuntimeException(this+" is locked "+closure); | |
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58 stack.add(closure); |
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59 } |
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60 |
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61 void pop() { |
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62 stack.remove(stack.size()-1); |
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63 } |
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64 |
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65 public Map registry() { |
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66 return registry; |
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67 } |
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68 |
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69 public Object eval(String cmd,Object... args) throws LuanException { |
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70 return load(cmd,"eval",false).call(args); |
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71 } |
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72 |
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73 public Object require(String modName) throws LuanException { |
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74 return PackageLuan.require(this,modName); |
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75 } |
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76 |
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77 public static String luanToString(Object obj) throws LuanException { |
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78 if( obj instanceof LuanTable ) { |
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79 LuanTable tbl = (LuanTable)obj; |
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80 return tbl.toStringLuan(); |
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81 } |
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82 if( obj == null ) |
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83 return "nil"; |
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84 if( obj instanceof Number ) |
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85 return Luan.toString((Number)obj); |
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86 if( obj instanceof byte[] ) |
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87 return "binary: " + Integer.toHexString(obj.hashCode()); |
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88 return obj.toString(); |
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89 } |
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90 |
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91 public Object index(Object obj,Object key) throws LuanException { |
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92 if( obj instanceof LuanTable ) { |
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93 LuanTable tbl = (LuanTable)obj; |
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94 return tbl.get(key); |
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95 } |
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96 if( obj != null && peek().javaOk ) |
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97 return JavaLuan.__index(this,obj,key); |
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98 throw new LuanException("attempt to index a " + Luan.type(obj) + " value" ); |
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99 } |
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100 |
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101 |
1335 | 102 public static boolean isLessThan(Object o1,Object o2) throws LuanException { |
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103 if( o1 instanceof Number && o2 instanceof Number ) { |
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104 Number n1 = (Number)o1; |
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105 Number n2 = (Number)o2; |
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106 return n1.doubleValue() < n2.doubleValue(); |
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107 } |
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108 if( o1 instanceof String && o2 instanceof String ) { |
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109 String s1 = (String)o1; |
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110 String s2 = (String)o2; |
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111 return s1.compareTo(s2) < 0; |
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112 } |
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113 LuanFunction fn = getBinHandler("__lt",o1,o2); |
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114 if( fn != null ) |
1335 | 115 return Luan.checkBoolean( Luan.first(fn.call(o1,o2)) ); |
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116 throw new LuanException( "attempt to compare " + Luan.type(o1) + " with " + Luan.type(o2) ); |
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117 } |
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118 |
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119 public static LuanFunction getBinHandler(String op,Object o1,Object o2) throws LuanException { |
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120 if( o1 instanceof LuanTable ) { |
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121 LuanFunction f1 = getHandlerFunction(op,(LuanTable)o1); |
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122 if( f1 != null ) |
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123 return f1; |
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124 } |
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125 return o2 instanceof LuanTable ? getHandlerFunction(op,(LuanTable)o2) : null; |
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126 } |
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127 |
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128 public static LuanFunction getHandlerFunction(String op,LuanTable t) throws LuanException { |
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129 Object f = t.getHandler(op); |
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130 if( f == null ) |
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131 return null; |
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132 return Luan.checkFunction(f); |
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133 } |
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134 |
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135 public LuanTable toTable(Object obj) { |
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136 if( obj == null ) |
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137 return null; |
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138 if( obj instanceof LuanTable ) |
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139 return (LuanTable)obj; |
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140 if( obj instanceof List ) { |
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141 return new LuanTable(this,(List)obj); |
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142 } |
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143 if( obj instanceof Map ) { |
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144 return new LuanTable(this,(Map)obj); |
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145 } |
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146 if( obj instanceof Set ) { |
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147 return new LuanTable(this,(Set)obj); |
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148 } |
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149 Class cls = obj.getClass(); |
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150 if( cls.isArray() ) { |
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151 if( cls.getComponentType().isPrimitive() ) { |
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152 int len = Array.getLength(obj); |
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153 List list = new ArrayList(); |
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154 for( int i=0; i<len; i++ ) { |
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155 list.add(Array.get(obj,i)); |
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156 } |
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157 return new LuanTable(this,list); |
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158 } else { |
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159 Object[] a = (Object[])obj; |
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160 return new LuanTable(this,Arrays.asList(a)); |
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161 } |
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162 } |
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163 return null; |
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164 } |
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165 |
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166 |
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167 |
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168 // static |
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169 |
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170 public static void main(String[] args) throws LuanException { |
1454 | 171 Luan luan = new Luan(); |
1424 | 172 LuanFunction fn = loadClasspath(luan,"luan/cmd_line.luan"); |
1335 | 173 fn.call((Object[])args); |
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174 } |
1454 | 175 |
176 public static LuanFunction loadClasspath(Luan luan,String classpath) | |
177 throws LuanException | |
178 { | |
1424 | 179 try { |
1454 | 180 String src = IoLuan.classpath(luan,classpath).read_text(); |
181 return luan.load(src,"classpath:"+classpath,true); | |
182 } catch(IOException e) { | |
183 throw new RuntimeException(e); | |
1424 | 184 } |
185 } | |
1454 | 186 |
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187 public static Object first(Object obj) { |
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188 if( !(obj instanceof Object[]) ) |
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189 return obj; |
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190 Object[] a = (Object[])obj; |
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191 return a.length==0 ? null : a[0]; |
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192 } |
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193 |
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194 public static Object[] array(Object obj) { |
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195 return obj instanceof Object[] ? (Object[])obj : new Object[]{obj}; |
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196 } |
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197 |
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198 public static String type(Object obj) { |
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199 if( obj == null ) |
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200 return "nil"; |
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201 if( obj instanceof String ) |
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202 return "string"; |
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203 if( obj instanceof Boolean ) |
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204 return "boolean"; |
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205 if( obj instanceof Number ) |
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206 return "number"; |
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207 if( obj instanceof LuanTable ) |
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208 return "table"; |
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209 if( obj instanceof LuanFunction ) |
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210 return "function"; |
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211 if( obj instanceof byte[] ) |
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212 return "binary"; |
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213 return "java"; |
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214 } |
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215 |
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216 public static String toString(Number n) { |
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217 if( n instanceof Integer ) |
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218 return n.toString(); |
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219 int i = n.intValue(); |
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220 if( i == n.doubleValue() ) |
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221 return Integer.toString(i); |
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222 String s = n.toString(); |
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223 int iE = s.indexOf('E'); |
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224 String ending = null; |
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225 if( iE != -1 ) { |
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226 ending = s.substring(iE); |
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227 s = s.substring(0,iE); |
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228 } |
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229 if( s.endsWith(".0") ) |
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230 s = s.substring(0,s.length()-2); |
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231 if( ending != null ) |
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232 s += ending; |
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233 return s; |
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234 } |
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235 |
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236 public static Integer asInteger(Object obj) { |
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237 if( obj instanceof Integer ) |
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238 return (Integer)obj; |
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239 if( !(obj instanceof Number) ) |
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240 return null; |
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241 Number n = (Number)obj; |
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242 int i = n.intValue(); |
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243 return i==n.doubleValue() ? Integer.valueOf(i) : null; |
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244 } |
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245 |
1442 | 246 public static Long asLong(Object obj) { |
247 if( obj instanceof Long ) | |
248 return (Long)obj; | |
249 if( !(obj instanceof Number) ) | |
250 return null; | |
251 Number n = (Number)obj; | |
252 long i = n.longValue(); | |
253 return i==n.doubleValue() ? Long.valueOf(i) : null; | |
254 } | |
255 | |
256 public static Float asFloat(Object obj) { | |
257 if( obj instanceof Float ) | |
258 return (Float)obj; | |
259 if( !(obj instanceof Number) ) | |
260 return null; | |
261 Number n = (Number)obj; | |
262 float i = n.floatValue(); | |
263 return i==n.doubleValue() ? Float.valueOf(i) : null; | |
264 } | |
265 | |
266 public static Double asDouble(Object obj) { | |
267 if( obj instanceof Double ) | |
268 return (Double)obj; | |
269 if( !(obj instanceof Number) ) | |
270 return null; | |
271 Number n = (Number)obj; | |
272 double i = n.doubleValue(); | |
273 return Double.valueOf(i); | |
274 } | |
275 | |
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276 public static String stringEncode(String s) { |
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277 s = s.replace("\\","\\\\"); |
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278 s = s.replace("\u0007","\\a"); |
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279 s = s.replace("\b","\\b"); |
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280 s = s.replace("\f","\\f"); |
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281 s = s.replace("\n","\\n"); |
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282 s = s.replace("\r","\\r"); |
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283 s = s.replace("\t","\\t"); |
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284 s = s.replace("\u000b","\\v"); |
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285 s = s.replace("\"","\\\""); |
420 | 286 s = s.replace("\'","\\'"); |
88
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287 return s; |
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288 } |
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289 |
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290 |
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291 public static Boolean checkBoolean(Object obj) throws LuanException { |
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292 if( obj instanceof Boolean ) |
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293 return (Boolean)obj; |
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294 throw new LuanException("attempt to use a " + Luan.type(obj) + " value as a boolean" ); |
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295 } |
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296 |
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297 public static String checkString(Object obj) throws LuanException { |
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298 if( obj instanceof String ) |
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299 return (String)obj; |
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300 throw new LuanException("attempt to use a " + Luan.type(obj) + " value as a string" ); |
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301 } |
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302 |
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303 public static LuanFunction checkFunction(Object obj) throws LuanException { |
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304 if( obj instanceof LuanFunction ) |
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305 return (LuanFunction)obj; |
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306 throw new LuanException("attempt to call a " + Luan.type(obj) + " value" ); |
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307 } |
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308 |
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309 public LuanFunction load(String text,String sourceName,boolean persist,LuanTable env) |
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310 throws LuanException |
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311 { |
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312 return LuanCompiler.compile(this,text,sourceName,persist,env); |
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313 } |
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314 |
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315 public LuanFunction load(String text,String sourceName,boolean persist) |
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316 throws LuanException |
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317 { |
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318 return load(text,sourceName,persist,null); |
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319 } |
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320 |
1113 | 321 public static Object toJava(Object obj) throws LuanException { |
322 if( !(obj instanceof LuanTable) ) | |
323 return obj; | |
324 LuanTable tbl = (LuanTable)obj; | |
1464 | 325 if( !tbl.isMap() ) { |
1113 | 326 List list = new ArrayList(); |
327 for( Object el : tbl.asList() ) { | |
328 list.add( toJava(el) ); | |
329 } | |
330 return list; | |
331 } else { | |
332 Map map = new LinkedHashMap(); | |
333 Iterator<Map.Entry> iter = tbl.rawIterator(); | |
334 while( iter.hasNext() ) { | |
335 Map.Entry entry = iter.next(); | |
336 map.put( toJava(entry.getKey()), toJava(entry.getValue()) ); | |
337 } | |
338 return map; | |
339 } | |
340 } | |
1330 | 341 |
342 | |
343 // security | |
344 | |
345 public interface Security { | |
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346 public void check(Luan luan,LuanClosure closure,String op,Object... args) throws LuanException; |
1330 | 347 } |
348 | |
349 private static String SECURITY_KEY = "Luan.Security"; | |
350 | |
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351 public static void checkSecurity(Luan luan,String op,Object... args) throws LuanException { |
1330 | 352 check(luan,1,op,args); |
353 } | |
354 | |
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355 public static void checkCallerSecurity(Luan luan,String op,Object... args) throws LuanException { |
1330 | 356 check(luan,2,op,args); |
357 } | |
358 | |
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359 private static void check(Luan luan,int i,String op,Object... args) throws LuanException { |
1330 | 360 Security s = (Security)luan.registry().get(SECURITY_KEY); |
361 if( s!=null ) | |
1432 | 362 s.check(luan,luan.peek(i),op,args); |
1330 | 363 } |
364 | |
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365 public static Security setSecurity(Luan luan,Security s) { |
1330 | 366 return (Security)luan.registry().put(SECURITY_KEY,s); |
367 } | |
368 | |
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369 } |