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annotate src/luan/lib/TableLib.java @ 73:f86e4f77ef32

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add package module git-svn-id: https://luan-java.googlecode.com/svn/trunk@74 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Tue, 12 Feb 2013 09:46:45 +0000
parents 8ede219cd111
children f003338d503b
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1 package luan.lib;
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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.LuanJavaFunction;
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11 import luan.LuanElement;
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12 import luan.LuanException;
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15 public final class TableLib {
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17 public static final String NAME = "table";
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19 public static final LuanFunction LOADER = new LuanFunction() {
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20 public Object[] call(LuanState luan,Object[] args) throws LuanException {
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21 LuanTable module = new LuanTable();
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22 LuanTable global = luan.global;
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23 global.put(NAME,module);
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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 return LuanFunction.EMPTY_RTN;
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36 }
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37 };
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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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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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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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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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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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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 } );
48
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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 }