Mercurial Hosting > luan
annotate src/luan/lib/TableLib.java @ 86:6db8f286fa6c
_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> |
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date | Wed, 27 Feb 2013 08:03:51 +0000 |
parents | 4bf3d0c0b6b9 |
children | 6ca02b188dba |
rev | line source |
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1 package luan.lib; |
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2 |
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3 import java.util.Comparator; |
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4 import java.util.ArrayList; |
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5 import java.util.Arrays; |
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6 import luan.Luan; |
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7 import luan.LuanState; |
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8 import luan.LuanTable; |
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9 import luan.LuanFunction; |
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10 import luan.LuanLoader; |
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11 import luan.LuanJavaFunction; |
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12 import luan.LuanElement; |
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13 import luan.LuanException; |
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14 import luan.LuanRuntimeException; |
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15 |
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16 |
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17 public final class TableLib { |
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18 |
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19 public static final String NAME = "table"; |
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20 |
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21 public static final LuanLoader LOADER = new LuanLoader() { |
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22 @Override protected void load(LuanState luan) { |
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23 LuanTable module = new LuanTable(); |
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24 try { |
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25 add( module, "concat", LuanState.class, LuanTable.class, String.class, Integer.class, Integer.class ); |
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26 add( module, "insert", LuanState.class, LuanTable.class, Integer.TYPE, Object.class ); |
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27 add( module, "pack", new Object[0].getClass() ); |
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28 add( module, "remove", LuanState.class, LuanTable.class, Integer.TYPE ); |
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29 add( module, "sort", LuanState.class, LuanTable.class, LuanFunction.class ); |
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30 add( module, "sub_list", LuanTable.class, Integer.TYPE, Integer.TYPE ); |
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31 add( module, "unpack", LuanTable.class ); |
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32 } catch(NoSuchMethodException e) { |
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33 throw new RuntimeException(e); |
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34 } |
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35 luan.loaded().put(NAME,module); |
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36 } |
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37 }; |
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38 |
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39 private static void add(LuanTable t,String method,Class<?>... parameterTypes) throws NoSuchMethodException { |
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40 t.put( method, new LuanJavaFunction(TableLib.class.getMethod(method,parameterTypes),null) ); |
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41 } |
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42 |
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43 public static String concat(LuanState luan,LuanTable list,String sep,Integer i,Integer j) throws LuanException { |
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44 int first = i==null ? 1 : i; |
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45 int last = j==null ? list.length() : j; |
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46 StringBuilder buf = new StringBuilder(); |
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47 for( int k=first; k<=last; k++ ) { |
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48 Object val = list.get(k); |
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49 if( val==null ) |
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50 break; |
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51 if( sep!=null && k > first ) |
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52 buf.append(sep); |
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53 String s = Luan.asString(val); |
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54 if( s==null ) |
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55 throw new LuanException( luan, LuanElement.JAVA, "invalid value ("+Luan.type(val)+") at index "+k+" in table for 'concat'" ); |
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56 buf.append(val); |
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57 } |
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58 return buf.toString(); |
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59 } |
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60 |
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61 public static void insert(LuanState luan,LuanTable list,int pos,Object value) throws LuanException { |
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62 try { |
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63 list.insert(pos,value); |
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64 } catch(IndexOutOfBoundsException e) { |
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65 throw new LuanException( luan, LuanElement.JAVA, e); |
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66 } |
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67 } |
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68 |
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69 public static Object remove(LuanState luan,LuanTable list,int pos) throws LuanException { |
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70 try { |
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71 return list.remove(pos); |
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72 } catch(IndexOutOfBoundsException e) { |
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73 throw new LuanException( luan, LuanElement.JAVA, e); |
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74 } |
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75 } |
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76 |
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77 private static interface LessThan { |
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78 public boolean isLessThan(Object o1,Object o2); |
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79 } |
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80 |
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81 public static void sort(final LuanState luan,LuanTable list,final LuanFunction comp) throws LuanException { |
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82 final LessThan lt; |
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83 if( comp==null ) { |
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84 lt = new LessThan() { |
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85 public boolean isLessThan(Object o1,Object o2) { |
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86 try { |
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87 return luan.isLessThan(LuanElement.JAVA,o1,o2); |
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88 } catch(LuanException e) { |
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89 throw new LuanRuntimeException(e); |
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90 } |
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91 } |
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92 }; |
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93 } else { |
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94 lt = new LessThan() { |
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95 public boolean isLessThan(Object o1,Object o2) { |
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96 try { |
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97 return Luan.toBoolean(Luan.first(luan.call(comp,LuanElement.JAVA,"comp-arg",o1,o2))); |
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98 } catch(LuanException e) { |
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99 throw new LuanRuntimeException(e); |
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100 } |
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101 } |
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102 }; |
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103 } |
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104 try { |
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105 list.sort( new Comparator<Object>() { |
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106 public int compare(Object o1,Object o2) { |
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107 return lt.isLessThan(o1,o2) ? -1 : lt.isLessThan(o2,o1) ? 1 : 0; |
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108 } |
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109 } ); |
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110 } catch(LuanRuntimeException e) { |
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111 throw (LuanException)e.getCause(); |
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112 } |
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113 } |
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114 |
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115 public static LuanTable pack(Object[] args) { |
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116 return new LuanTable(new ArrayList<Object>(Arrays.asList(args))); |
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117 } |
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118 |
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119 public static Object[] unpack(LuanTable list) { |
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120 return list.listToArray(); |
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121 } |
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122 |
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123 public static LuanTable sub_list(LuanTable list,int from,int to) { |
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124 return list.subList(from,to); |
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125 } |
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126 |
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127 } |