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annotate core/src/luan/modules/TableLuan.java @ 297:899253043270

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remove PackageLuan.load_lib() git-svn-id: https://luan-java.googlecode.com/svn/trunk@298 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Tue, 16 Dec 2014 03:26:43 +0000
parents 8afe9f2fdfec
children 7fd9f1b7b878
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
167
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diff changeset
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.LuanException;
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12 import luan.LuanRuntimeException;
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13 import luan.LuanMethod;
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15
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16 public final class TableLuan {
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18 public static String concat(LuanState luan,LuanTable list,String sep,Integer i,Integer j) throws LuanException {
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19 int first = i==null ? 1 : i;
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20 int last = j==null ? list.length() : j;
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21 StringBuilder buf = new StringBuilder();
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22 for( int k=first; k<=last; k++ ) {
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23 Object val = list.get(k);
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24 if( val==null )
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25 break;
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26 if( sep!=null && k > first )
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27 buf.append(sep);
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28 String s = Luan.asString(val);
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29 if( s==null )
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30 throw luan.exception( "invalid value ("+Luan.type(val)+") at index "+k+" in table for 'concat'" );
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31 buf.append(val);
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32 }
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33 return buf.toString();
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34 }
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35
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36 public static void insert(LuanTable list,int pos,Object value){
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37 list.insert(pos,value);
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38 }
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40 public static Object remove(LuanTable list,int pos) {
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41 return list.remove(pos);
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42 }
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44 private static interface LessThan {
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45 public boolean isLessThan(Object o1,Object o2);
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46 }
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47
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48 public static void sort(final LuanState luan,LuanTable list,final LuanFunction comp) throws LuanException {
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49 final LessThan lt;
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50 if( comp==null ) {
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51 lt = new LessThan() {
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52 public boolean isLessThan(Object o1,Object o2) {
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53 try {
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54 return luan.isLessThan(o1,o2);
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55 } catch(LuanException e) {
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56 throw new LuanRuntimeException(e);
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57 }
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58 }
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59 };
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60 } else {
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61 lt = new LessThan() {
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62 public boolean isLessThan(Object o1,Object o2) {
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63 try {
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64 return Luan.toBoolean(Luan.first(luan.call(comp,"comp-arg",new Object[]{o1,o2})));
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65 } catch(LuanException e) {
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66 throw new LuanRuntimeException(e);
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67 }
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68 }
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69 };
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70 }
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71 try {
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72 list.sort( new Comparator<Object>() {
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73 public int compare(Object o1,Object o2) {
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74 return lt.isLessThan(o1,o2) ? -1 : lt.isLessThan(o2,o1) ? 1 : 0;
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75 }
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76 } );
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77 } catch(LuanRuntimeException e) {
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78 throw (LuanException)e.getCause();
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79 }
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80 }
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81
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82 public static LuanTable pack(Object... args) {
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83 LuanTable tbl = Luan.newTable();
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84 boolean hasNull = false;
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85 for( int i=0; i<args.length; i++ ) {
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86 Object v = args[i];
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87 if( v==null ) {
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88 hasNull = true;
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89 } else if( !hasNull ) {
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90 tbl.add(v);
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91 } else {
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92 tbl.put(i+1,v);
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93 }
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94 }
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95 tbl.put( "n", args.length );
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96 return tbl;
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97 }
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98
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99 @LuanMethod public static Object[] unpack(LuanTable tbl,Integer iFrom,Integer iTo) {
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100 int from = iFrom!=null ? iFrom : 1;
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101 int to = iTo!=null ? iTo : tbl.length();
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102 List<Object> list = new ArrayList<Object>();
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103 for( int i=from; i<=to; i++ ) {
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104 list.add( tbl.get(i) );
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105 }
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106 return list.toArray();
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107 }
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108
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109 public static LuanTable sub_list(LuanTable list,int from,int to) {
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110 return list.subList(from,to);
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111 }
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112
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113 public static LuanTable clone(LuanTable tbl) {
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114 return tbl.cloneTable();
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115 }
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116
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117 }