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annotate src/luan/lib/TableLib.java @ 74:f003338d503b

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improve package lib git-svn-id: https://luan-java.googlecode.com/svn/trunk@75 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Wed, 13 Feb 2013 06:27:56 +0000
parents f86e4f77ef32
children 97b03fc807ad
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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 try {
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24 add( module, "concat", LuanState.class, LuanTable.class, String.class, Integer.class, Integer.class );
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25 add( module, "insert", LuanState.class, LuanTable.class, Integer.TYPE, Object.class );
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26 add( module, "pack", new Object[0].getClass() );
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27 add( module, "remove", LuanState.class, LuanTable.class, Integer.TYPE );
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28 add( module, "sort", LuanState.class, LuanTable.class, LuanFunction.class );
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29 add( module, "sub_list", LuanTable.class, Integer.TYPE, Integer.TYPE );
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30 add( module, "unpack", LuanTable.class );
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31 } catch(NoSuchMethodException e) {
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32 throw new RuntimeException(e);
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33 }
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34 return new Object[]{module};
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35 }
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36 };
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38 private static void add(LuanTable t,String method,Class<?>... parameterTypes) throws NoSuchMethodException {
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39 t.put( method, new LuanJavaFunction(TableLib.class.getMethod(method,parameterTypes),null) );
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40 }
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42 public static String concat(LuanState luan,LuanTable list,String sep,Integer i,Integer j) throws LuanException {
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43 int first = i==null ? 1 : i;
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44 int last = j==null ? list.length() : j;
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45 StringBuilder buf = new StringBuilder();
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46 for( int k=first; k<=last; k++ ) {
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47 Object val = list.get(k);
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48 if( val==null )
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49 break;
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50 if( sep!=null && k > first )
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51 buf.append(sep);
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52 String s = Luan.asString(val);
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53 if( s==null )
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54 throw new LuanException( luan, LuanElement.JAVA, "invalid value ("+Luan.type(val)+") at index "+k+" in table for 'concat'" );
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55 buf.append(val);
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56 }
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57 return buf.toString();
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58 }
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60 public static void insert(LuanState luan,LuanTable list,int pos,Object value) throws LuanException {
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61 try {
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62 list.insert(pos,value);
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63 } catch(IndexOutOfBoundsException e) {
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64 throw new LuanException( luan, LuanElement.JAVA, e);
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65 }
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66 }
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68 public static Object remove(LuanState luan,LuanTable list,int pos) throws LuanException {
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69 try {
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70 return list.remove(pos);
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71 } catch(IndexOutOfBoundsException e) {
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72 throw new LuanException( luan, LuanElement.JAVA, e);
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73 }
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74 }
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76 private static interface LessThan {
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77 public boolean isLessThan(Object o1,Object o2);
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78 }
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80 public static void sort(final LuanState luan,LuanTable list,final LuanFunction comp) throws LuanException {
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81 final LessThan lt;
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82 if( comp==null ) {
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83 lt = new LessThan() {
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84 public boolean isLessThan(Object o1,Object o2) {
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85 try {
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86 return luan.isLessThan(LuanElement.JAVA,o1,o2);
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87 } catch(LuanException e) {
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88 throw new LuanRuntimeException(e);
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89 }
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90 }
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91 };
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92 } else {
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93 lt = new LessThan() {
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94 public boolean isLessThan(Object o1,Object o2) {
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95 try {
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96 return Luan.toBoolean(Luan.first(luan.call(comp,LuanElement.JAVA,"comp-arg",o1,o2)));
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97 } catch(LuanException e) {
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98 throw new LuanRuntimeException(e);
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99 }
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100 }
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101 };
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102 }
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103 try {
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104 list.sort( new Comparator<Object>() {
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105 public int compare(Object o1,Object o2) {
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106 return lt.isLessThan(o1,o2) ? -1 : lt.isLessThan(o2,o1) ? 1 : 0;
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107 }
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108 } );
48
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109 } catch(LuanRuntimeException e) {
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110 throw (LuanException)e.getCause();
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111 }
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112 }
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113
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114 public static LuanTable pack(Object[] args) {
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115 return new LuanTable(new ArrayList<Object>(Arrays.asList(args)));
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116 }
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117
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118 public static Object[] unpack(LuanTable list) {
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119 return list.listToArray();
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120 }
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121
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122 public static LuanTable sub_list(LuanTable list,int from,int to) {
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123 return list.subList(from,to);
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124 }
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125
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126 }