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annotate src/luan/lib/StringLib.java @ 130:0594c132888b

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cleanup git-svn-id: https://luan-java.googlecode.com/svn/trunk@131 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Tue, 10 Jun 2014 02:43:40 +0000
parents f537ff5e511d
children 3119326260ea
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1 package luan.lib;
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2
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3 import java.util.regex.Pattern;
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4 import java.util.regex.Matcher;
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5 import luan.Luan;
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6 import luan.LuanState;
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7 import luan.LuanTable;
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8 import luan.LuanFunction;
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9 import luan.LuanJavaFunction;
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10 import luan.LuanElement;
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11 import luan.LuanException;
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12 import luan.MetatableGetter;
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15 public final class StringLib {
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16
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17 public static void load(LuanState luan) throws LuanException {
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18 luan.load("String",LOADER);
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19 }
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20
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21 public static final LuanFunction LOADER = new LuanFunction() {
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22 @Override public Object call(LuanState luan,Object[] args) {
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23 luan.addMetatableGetter(mg);
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24 LuanTable module = new LuanTable();
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25 try {
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26 add( module, "to_binary", String.class );
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27 add( module, "to_integers", String.class );
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28 add( module, "from_integers", new int[0].getClass() );
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29 add( module, "find", String.class, String.class, Integer.class, Boolean.class );
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30 add( module, "format", String.class, new Object[0].getClass() );
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31 add( module, "gmatch", String.class, String.class );
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32 add( module, "gsub", LuanState.class, String.class, String.class, Object.class, Integer.class );
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33 add( module, "len", String.class );
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34 add( module, "lower", String.class );
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35 add( module, "match", String.class, String.class, Integer.class );
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36 add( module, "rep", String.class, Integer.TYPE, String.class );
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37 add( module, "reverse", String.class );
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38 add( module, "sub", String.class, Integer.TYPE, Integer.class );
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39 add( module, "upper", String.class );
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40 } catch(NoSuchMethodException e) {
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41 throw new RuntimeException(e);
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42 }
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43 return module;
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44 }
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45 };
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46
48
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47 private static void add(LuanTable t,String method,Class<?>... parameterTypes) throws NoSuchMethodException {
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48 t.put( method, new LuanJavaFunction(StringLib.class.getMethod(method,parameterTypes),null) );
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49 }
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50
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51 private static final LuanTable mt = new LuanTable();
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52 static {
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53 try {
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54 add( mt, "__index", LuanState.class, String.class, Object.class );
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55 } catch(NoSuchMethodException e) {
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56 throw new RuntimeException(e);
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57 }
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58 }
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59
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60 private static final MetatableGetter mg = new MetatableGetter() {
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61 public LuanTable getMetatable(Object obj) {
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62 return obj instanceof String ? mt : null;
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63 }
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64 };
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65
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66 public static Object __index(LuanState luan,final String s,Object key) throws LuanException {
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67 LuanTable mod = (LuanTable)luan.global().get("String");
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68 if( mod!=null ) {
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69 Object obj = mod.get(key);
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70 if( obj instanceof LuanFunction ) {
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71 final LuanFunction fn = (LuanFunction)obj;
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72 return new LuanFunction() {
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73 @Override public Object call(LuanState luan,Object[] args) throws LuanException {
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74 Object[] a = new Object[args.length+1];
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75 a[0] = s;
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76 System.arraycopy(args,0,a,1,args.length);
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77 return fn.call(luan,a);
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78 }
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79 };
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80 }
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81 }
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82 if( luan.global().get("Java") != null )
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83 return JavaLib.__index(luan,s,key);
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84 return null;
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85 }
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86
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87 static int start(String s,int i) {
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88 return i==0 ? 0 : i > 0 ? i - 1 : s.length() + i;
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89 }
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90
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91 static int start(String s,Integer i,int dflt) {
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92 return i==null ? dflt : start(s,i);
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93 }
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94
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95 static int end(String s,int i) {
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96 return i==0 ? 0 : i > 0 ? i : s.length() + i + 1;
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97 }
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99 static int end(String s,Integer i,int dflt) {
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100 return i==null ? dflt : end(s,i);
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101 }
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102
113
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103 public static byte[] to_binary(String s) {
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104 return s.getBytes();
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105 }
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106
113
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107 public static int[] to_integers(String s) {
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108 char[] a = s.toCharArray();
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109 int[] chars = new int[a.length];
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110 for( int i=0; i<a.length; i++ ) {
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111 chars[i] = a[i];
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112 }
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113 return chars;
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114 }
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115
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116 public static String from_integers(int... chars) {
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117 char[] a = new char[chars.length];
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118 for( int i=0; i<chars.length; i++ ) {
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119 a[i] = (char)chars[i];
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120 }
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121 return new String(a);
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122 }
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123
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124 public static int len(String s) {
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125 return s.length();
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126 }
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127
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128 public static String lower(String s) {
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129 return s.toLowerCase();
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130 }
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131
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132 public static String upper(String s) {
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133 return s.toUpperCase();
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134 }
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135
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136 public static String reverse(String s) {
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137 return new StringBuilder(s).reverse().toString();
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138 }
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139
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140 public static String rep(String s,int n,String sep) {
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141 if( n < 1 )
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142 return "";
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143 StringBuilder buf = new StringBuilder(s);
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144 while( --n > 0 ) {
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145 if( sep != null )
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146 buf.append(sep);
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147 buf.append(s);
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148 }
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149 return buf.toString();
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150 }
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151
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152 public static String sub(String s,int i,Integer j) {
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153 int start = start(s,i);
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154 int end = end(s,j,s.length());
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155 return s.substring(start,end);
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156 }
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157
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158 public static int[] find(String s,String pattern,Integer init,Boolean plain) {
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159 int start = start(s,init,0);
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160 if( Boolean.TRUE.equals(plain) ) {
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161 int i = s.indexOf(pattern,start);
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162 return i == -1 ? null : new int[]{i+1,i+pattern.length()};
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163 }
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164 Matcher m = Pattern.compile(pattern).matcher(s);
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165 return m.find(start) ? new int[]{m.start()+1,m.end()} : null;
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166 }
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167
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168 public static String[] match(String s,String pattern,Integer init) {
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169 int start = start(s,init,0);
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170 Matcher m = Pattern.compile(pattern).matcher(s);
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171 if( !m.find(start) )
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172 return null;
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173 final int n = m.groupCount();
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174 if( n == 0 )
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175 return new String[]{m.group()};
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176 String[] rtn = new String[n];
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177 for( int i=0; i<n; i++ ) {
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178 rtn[i] = m.group(i);
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179 }
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180 return rtn;
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181 }
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182
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183 public static LuanFunction gmatch(String s,String pattern) {
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184 final Matcher m = Pattern.compile(pattern).matcher(s);
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185 return new LuanFunction() {
112
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186 @Override public Object call(LuanState luan,Object[] args) {
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187 if( !m.find() )
112
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188 return null;
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189 final int n = m.groupCount();
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190 if( n == 0 )
112
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191 return m.group();
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192 String[] rtn = new String[n];
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193 for( int i=0; i<n; i++ ) {
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194 rtn[i] = m.group(i);
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195 }
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196 return rtn;
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197 }
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198 };
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199 }
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200
49
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201 public static Object[] gsub(LuanState luan,String s,String pattern,Object repl,Integer n) throws LuanException {
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202 int max = n==null ? Integer.MAX_VALUE : n;
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203 final Matcher m = Pattern.compile(pattern).matcher(s);
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204 if( repl instanceof String ) {
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205 String replacement = (String)repl;
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206 int i = 0;
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207 StringBuffer sb = new StringBuffer();
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208 while( i<max && m.find() ) {
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209 m.appendReplacement(sb,replacement);
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210 i++;
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211 }
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212 m.appendTail(sb);
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213 return new Object[]{ sb.toString(), i };
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214 }
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215 if( repl instanceof LuanTable ) {
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216 LuanTable t = (LuanTable)repl;
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217 int i = 0;
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218 StringBuffer sb = new StringBuffer();
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219 while( i<max && m.find() ) {
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220 String match = m.groupCount()==0 ? m.group() : m.group(1);
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221 Object val = t.get(match);
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222 if( Luan.toBoolean(val) ) {
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223 String replacement = Luan.asString(val);
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224 if( replacement==null )
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225 throw luan.exception( "invalid replacement value (a "+Luan.type(val)+")" );
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226 m.appendReplacement(sb,replacement);
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227 }
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228 i++;
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229 }
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230 m.appendTail(sb);
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231 return new Object[]{ sb.toString(), i };
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232 }
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233 if( repl instanceof LuanFunction ) {
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234 LuanFunction fn = (LuanFunction)repl;
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235 int i = 0;
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236 StringBuffer sb = new StringBuffer();
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237 while( i<max && m.find() ) {
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238 Object[] args;
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239 final int count = m.groupCount();
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240 if( count == 0 ) {
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241 args = new Object[]{m.group()};
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242 } else {
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243 args = new Object[count];
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244 for( int j=0; j<count; j++ ) {
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245 args[j] = m.group(j);
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246 }
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247 }
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248 Object val = Luan.first( luan.call(fn,"repl-arg",args) );
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249 if( Luan.toBoolean(val) ) {
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250 String replacement = Luan.asString(val);
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251 if( replacement==null )
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252 throw luan.exception( "invalid replacement value (a "+Luan.type(val)+")" );
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253 m.appendReplacement(sb,replacement);
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254 }
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255 i++;
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256 }
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257 m.appendTail(sb);
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258 return new Object[]{ sb.toString(), i };
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259 }
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260 throw luan.exception( "bad argument #3 to 'gsub' (string/function/table expected)" );
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261 }
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262
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263 // note - String.format() is too stupid to convert between ints and floats.
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264 public static String format(String format,Object... args) {
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265 return String.format(format,args);
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266 }
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267
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268 }