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annotate core/src/luan/modules/StringLuan.java @ 196:be0275bda373

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minor git-svn-id: https://luan-java.googlecode.com/svn/trunk@197 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Thu, 03 Jul 2014 18:03:53 +0000
parents 24ede40ee0aa
children 4c96cb73dd93
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rev   line source
167
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1 package luan.modules;
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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;
48
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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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13 import luan.DeepCloner;
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14
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15
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16 public final class StringLuan {
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17
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18 public static final LuanFunction LOADER = new LuanFunction() {
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19 @Override public Object call(LuanState luan,Object[] args) {
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20 LuanTable module = new LuanTable();
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21 module.put( MetatableGetter.KEY, new MyMetatableGetter(module) );
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22 try {
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23 add( module, "to_binary", String.class );
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24 add( module, "to_integers", String.class );
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25 add( module, "from_integers", new int[0].getClass() );
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26 add( module, "find", String.class, String.class, Integer.class, Boolean.class );
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27 add( module, "format", String.class, new Object[0].getClass() );
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28 add( module, "gmatch", String.class, String.class );
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29 add( module, "gsub", LuanState.class, String.class, String.class, Object.class, Integer.class );
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30 add( module, "len", String.class );
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31 add( module, "lower", String.class );
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32 add( module, "match", String.class, String.class, Integer.class );
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33 add( module, "rep", String.class, Integer.TYPE, String.class );
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34 add( module, "reverse", String.class );
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35 add( module, "sub", String.class, Integer.TYPE, Integer.class );
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36 add( module, "upper", String.class );
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37 } catch(NoSuchMethodException e) {
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38 throw new RuntimeException(e);
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39 }
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40 return module;
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41 }
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42 };
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43
48
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44 private static void add(LuanTable t,String method,Class<?>... parameterTypes) throws NoSuchMethodException {
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45 t.put( method, new LuanJavaFunction(StringLuan.class.getMethod(method,parameterTypes),null) );
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46 }
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47
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48 public static class MyMetatableGetter implements MetatableGetter {
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49 private LuanTable module;
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50 private LuanTable metatable;
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51
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52 private MyMetatableGetter() {}
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53
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54 MyMetatableGetter(LuanTable module) {
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55 this.module = module;
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56 this.metatable = table();
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57 }
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58
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59 @Override public LuanTable getMetatable(Object obj) {
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60 return obj instanceof String ? metatable : null;
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61 }
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62
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63 public Object __index(LuanState luan,final String s,Object key) throws LuanException {
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64 Object obj = module.get(key);
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65 if( obj instanceof LuanFunction ) {
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66 final LuanFunction fn = (LuanFunction)obj;
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67 return new LuanFunction() {
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68 @Override public Object call(LuanState luan,Object[] args) throws LuanException {
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69 Object[] a = new Object[args.length+1];
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70 a[0] = s;
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71 System.arraycopy(args,0,a,1,args.length);
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72 return fn.call(luan,a);
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73 }
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74 };
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75 }
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76 LuanTable mt = luan.getMetatable(s,this);
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77 if( mt == null )
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78 return null;
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79 Object h = mt.get("__index");
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80 if( !(h instanceof LuanFunction) )
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81 return null;
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82 LuanFunction fn = (LuanFunction)h;
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83 return luan.call(fn,new Object[]{s,key});
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84 }
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86 LuanTable table() {
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87 LuanTable tbl = new LuanTable();
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88 try {
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89 tbl.put( "__index", new LuanJavaFunction(
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90 MyMetatableGetter.class.getMethod( "__index", LuanState.class, String.class, Object.class ), this
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91 ) );
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92 } catch(NoSuchMethodException e) {
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93 throw new RuntimeException(e);
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94 }
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95 return tbl;
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96 }
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97
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98 @Override public MetatableGetter shallowClone() {
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99 return new MyMetatableGetter();
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100 }
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101
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102 @Override public void deepenClone(MetatableGetter c,DeepCloner cloner) {
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103 MyMetatableGetter clone = (MyMetatableGetter)c;
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104 clone.module = cloner.deepClone(module);
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105 clone.metatable = clone.table();
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106 }
119
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107 }
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108
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109 static int start(String s,int i) {
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110 return i==0 ? 0 : i > 0 ? i - 1 : s.length() + i;
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111 }
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112
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113 static int start(String s,Integer i,int dflt) {
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114 return i==null ? dflt : start(s,i);
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115 }
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116
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117 static int end(String s,int i) {
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118 return i==0 ? 0 : i > 0 ? i : s.length() + i + 1;
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119 }
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120
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121 static int end(String s,Integer i,int dflt) {
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122 return i==null ? dflt : end(s,i);
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123 }
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124
113
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125 public static byte[] to_binary(String s) {
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126 return s.getBytes();
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127 }
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128
113
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129 public static int[] to_integers(String s) {
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130 char[] a = s.toCharArray();
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131 int[] chars = new int[a.length];
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132 for( int i=0; i<a.length; i++ ) {
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133 chars[i] = a[i];
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134 }
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135 return chars;
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136 }
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137
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138 public static String from_integers(int... chars) {
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139 char[] a = new char[chars.length];
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140 for( int i=0; i<chars.length; i++ ) {
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141 a[i] = (char)chars[i];
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142 }
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143 return new String(a);
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144 }
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145
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146 public static int len(String s) {
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147 return s.length();
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148 }
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149
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150 public static String lower(String s) {
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151 return s.toLowerCase();
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152 }
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153
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154 public static String upper(String s) {
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155 return s.toUpperCase();
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156 }
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157
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158 public static String reverse(String s) {
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159 return new StringBuilder(s).reverse().toString();
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160 }
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161
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162 public static String rep(String s,int n,String sep) {
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163 if( n < 1 )
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164 return "";
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165 StringBuilder buf = new StringBuilder(s);
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166 while( --n > 0 ) {
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167 if( sep != null )
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168 buf.append(sep);
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169 buf.append(s);
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170 }
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171 return buf.toString();
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172 }
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173
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174 public static String sub(String s,int i,Integer j) {
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175 int start = start(s,i);
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176 int end = end(s,j,s.length());
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177 return s.substring(start,end);
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178 }
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179
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180 public static int[] find(String s,String pattern,Integer init,Boolean plain) {
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181 int start = start(s,init,0);
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182 if( Boolean.TRUE.equals(plain) ) {
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183 int i = s.indexOf(pattern,start);
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184 return i == -1 ? null : new int[]{i+1,i+pattern.length()};
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185 }
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186 Matcher m = Pattern.compile(pattern).matcher(s);
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187 return m.find(start) ? new int[]{m.start()+1,m.end()} : null;
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188 }
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189
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190 public static String[] match(String s,String pattern,Integer init) {
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191 int start = start(s,init,0);
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192 Matcher m = Pattern.compile(pattern).matcher(s);
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193 if( !m.find(start) )
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194 return null;
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195 final int n = m.groupCount();
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196 if( n == 0 )
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197 return new String[]{m.group()};
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198 String[] rtn = new String[n];
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199 for( int i=0; i<n; i++ ) {
161
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200 rtn[i] = m.group(i+1);
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201 }
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202 return rtn;
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203 }
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204
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205 public static LuanFunction gmatch(String s,String pattern) {
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206 final Matcher m = Pattern.compile(pattern).matcher(s);
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207 return new LuanFunction() {
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208 @Override public Object call(LuanState luan,Object[] args) {
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209 if( !m.find() )
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210 return null;
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211 final int n = m.groupCount();
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212 if( n == 0 )
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213 return m.group();
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214 String[] rtn = new String[n];
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215 for( int i=0; i<n; i++ ) {
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216 rtn[i] = m.group(i+1);
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217 }
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218 return rtn;
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219 }
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220 };
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221 }
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222
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223 public static Object[] gsub(LuanState luan,String s,String pattern,Object repl,Integer n) throws LuanException {
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224 int max = n==null ? Integer.MAX_VALUE : n;
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225 final Matcher m = Pattern.compile(pattern).matcher(s);
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226 if( repl instanceof String ) {
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227 String replacement = (String)repl;
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228 int i = 0;
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229 StringBuffer sb = new StringBuffer();
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230 while( i<max && m.find() ) {
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231 m.appendReplacement(sb,replacement);
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232 i++;
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233 }
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234 m.appendTail(sb);
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235 return new Object[]{ sb.toString(), i };
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236 }
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237 if( repl instanceof LuanTable ) {
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238 LuanTable t = (LuanTable)repl;
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239 int i = 0;
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240 StringBuffer sb = new StringBuffer();
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241 while( i<max && m.find() ) {
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242 String match = m.groupCount()==0 ? m.group() : m.group(1);
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243 Object val = t.get(match);
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244 if( Luan.toBoolean(val) ) {
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245 String replacement = Luan.asString(val);
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246 if( replacement==null )
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247 throw luan.exception( "invalid replacement value (a "+Luan.type(val)+")" );
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248 m.appendReplacement(sb,replacement);
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249 }
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250 i++;
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251 }
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252 m.appendTail(sb);
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253 return new Object[]{ sb.toString(), i };
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254 }
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255 if( repl instanceof LuanFunction ) {
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256 LuanFunction fn = (LuanFunction)repl;
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257 int i = 0;
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258 StringBuffer sb = new StringBuffer();
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259 while( i<max && m.find() ) {
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260 Object[] args;
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261 final int count = m.groupCount();
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262 if( count == 0 ) {
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263 args = new Object[]{m.group()};
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264 } else {
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265 args = new Object[count];
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266 for( int j=0; j<count; j++ ) {
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267 args[j] = m.group(j);
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268 }
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269 }
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270 Object val = Luan.first( luan.call(fn,"repl-arg",args) );
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271 if( Luan.toBoolean(val) ) {
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272 String replacement = Luan.asString(val);
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273 if( replacement==null )
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274 throw luan.exception( "invalid replacement value (a "+Luan.type(val)+")" );
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275 m.appendReplacement(sb,replacement);
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276 }
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277 i++;
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278 }
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279 m.appendTail(sb);
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280 return new Object[]{ sb.toString(), i };
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281 }
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282 throw luan.exception( "bad argument #3 to 'gsub' (string/function/table expected)" );
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283 }
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284
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285 // note - String.format() is too stupid to convert between ints and floats.
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286 public static String format(String format,Object... args) {
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287 return String.format(format,args);
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288 }
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289
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290 }