Mercurial Hosting > luan
annotate src/luan/modules/TableLib.java @ 167:4c0131c2b650
merge luan/lib into modules
git-svn-id: https://luan-java.googlecode.com/svn/trunk@168 21e917c8-12df-6dd8-5cb6-c86387c605b9
author | fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9> |
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date | Sun, 22 Jun 2014 04:28:32 +0000 |
parents | src/luan/lib/TableLib.java@05f8c21160ef |
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167
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1 package luan.modules; |
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2 |
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3 import java.util.Comparator; |
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4 import java.util.List; |
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5 import java.util.ArrayList; |
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6 import java.util.Arrays; |
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7 import luan.Luan; |
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8 import luan.LuanState; |
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9 import luan.LuanTable; |
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10 import luan.LuanFunction; |
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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 LuanFunction LOADER = new LuanFunction() { |
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20 @Override public Object call(LuanState luan,Object[] args) { |
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21 LuanTable module = new LuanTable(); |
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22 try { |
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23 add( module, "concat", LuanState.class, LuanTable.class, String.class, Integer.class, Integer.class ); |
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24 add( module, "insert", LuanState.class, LuanTable.class, Integer.TYPE, Object.class ); |
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25 add( module, "pack", new Object[0].getClass() ); |
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26 add( module, "remove", LuanState.class, LuanTable.class, Integer.TYPE ); |
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27 add( module, "sort", LuanState.class, LuanTable.class, LuanFunction.class ); |
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28 add( module, "sub_list", LuanTable.class, Integer.TYPE, Integer.TYPE ); |
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29 add( module, "unpack", LuanTable.class, Integer.class, Integer.class ); |
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30 } catch(NoSuchMethodException e) { |
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31 throw new RuntimeException(e); |
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32 } |
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33 return module; |
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34 } |
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35 }; |
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36 |
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37 private static void add(LuanTable t,String method,Class<?>... parameterTypes) throws NoSuchMethodException { |
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38 t.put( method, new LuanJavaFunction(TableLib.class.getMethod(method,parameterTypes),null) ); |
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39 } |
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40 |
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41 public static String concat(LuanState luan,LuanTable list,String sep,Integer i,Integer j) throws LuanException { |
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42 int first = i==null ? 1 : i; |
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43 int last = j==null ? list.length() : j; |
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44 StringBuilder buf = new StringBuilder(); |
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45 for( int k=first; k<=last; k++ ) { |
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46 Object val = list.get(k); |
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47 if( val==null ) |
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48 break; |
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49 if( sep!=null && k > first ) |
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50 buf.append(sep); |
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51 String s = Luan.asString(val); |
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52 if( s==null ) |
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53 throw luan.exception( "invalid value ("+Luan.type(val)+") at index "+k+" in table for 'concat'" ); |
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54 buf.append(val); |
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55 } |
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56 return buf.toString(); |
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57 } |
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58 |
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59 public static void insert(LuanState luan,LuanTable list,int pos,Object value) throws LuanException { |
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60 try { |
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61 list.insert(pos,value); |
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62 } catch(IndexOutOfBoundsException e) { |
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63 throw luan.exception(e); |
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64 } |
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65 } |
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66 |
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67 public static Object remove(LuanState luan,LuanTable list,int pos) throws LuanException { |
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68 try { |
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69 return list.remove(pos); |
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70 } catch(IndexOutOfBoundsException e) { |
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71 throw luan.exception(e); |
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72 } |
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73 } |
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74 |
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75 private static interface LessThan { |
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76 public boolean isLessThan(Object o1,Object o2); |
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77 } |
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78 |
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79 public static void sort(final LuanState luan,LuanTable list,final LuanFunction comp) throws LuanException { |
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80 final LessThan lt; |
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81 if( comp==null ) { |
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82 lt = new LessThan() { |
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83 public boolean isLessThan(Object o1,Object o2) { |
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84 try { |
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85 return luan.isLessThan(o1,o2); |
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86 } catch(LuanException e) { |
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87 throw new LuanRuntimeException(e); |
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88 } |
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89 } |
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90 }; |
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91 } else { |
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92 lt = new LessThan() { |
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93 public boolean isLessThan(Object o1,Object o2) { |
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94 try { |
130
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95 return Luan.toBoolean(Luan.first(luan.call(comp,"comp-arg",new Object[]{o1,o2}))); |
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96 } catch(LuanException e) { |
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97 throw new LuanRuntimeException(e); |
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98 } |
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99 } |
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100 }; |
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101 } |
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102 try { |
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103 list.sort( new Comparator<Object>() { |
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104 public int compare(Object o1,Object o2) { |
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105 return lt.isLessThan(o1,o2) ? -1 : lt.isLessThan(o2,o1) ? 1 : 0; |
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106 } |
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107 } ); |
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108 } catch(LuanRuntimeException e) { |
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109 throw (LuanException)e.getCause(); |
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110 } |
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111 } |
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112 |
118
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113 public static LuanTable pack(Object... args) { |
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114 return new LuanTable(new ArrayList<Object>(Arrays.asList(args))); |
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115 } |
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116 |
118
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117 public static Object[] unpack(LuanTable tbl,Integer iFrom,Integer iTo) { |
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118 int from = iFrom!=null ? iFrom : 1; |
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119 int to = iTo!=null ? iTo : tbl.length(); |
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120 List<Object> list = new ArrayList<Object>(); |
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121 for( int i=from; i<=to; i++ ) { |
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122 list.add( tbl.get(i) ); |
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123 } |
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124 return list.toArray(); |
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125 } |
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126 |
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127 public static LuanTable sub_list(LuanTable list,int from,int to) { |
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128 return list.subList(from,to); |
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129 } |
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130 |
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131 } |