Mercurial Hosting > luan
annotate src/luan/lib/StringLib.java @ 119:f1bf2890d80f
support String methods
git-svn-id: https://luan-java.googlecode.com/svn/trunk@120 21e917c8-12df-6dd8-5cb6-c86387c605b9
author | fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9> |
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date | Sun, 01 Jun 2014 09:38:40 +0000 |
parents | 8c706d6eb5dc |
children | f537ff5e511d |
rev | line source |
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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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13 |
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14 |
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15 public final class StringLib { |
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16 |
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17 public static final String NAME = "String"; |
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18 |
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19 public static final LuanFunction LOADER = new LuanFunction() { |
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20 @Override public Object call(LuanState luan,Object[] args) { |
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21 luan.addMetatableGetter(mg); |
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22 LuanTable module = new LuanTable(); |
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23 try { |
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24 add( module, "to_binary", String.class ); |
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25 add( module, "to_integers", String.class ); |
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26 add( module, "from_integers", new int[0].getClass() ); |
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27 add( module, "find", String.class, String.class, Integer.class, Boolean.class ); |
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28 add( module, "format", String.class, new Object[0].getClass() ); |
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29 add( module, "gmatch", String.class, String.class ); |
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30 add( module, "gsub", LuanState.class, String.class, String.class, Object.class, Integer.class ); |
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31 add( module, "len", String.class ); |
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32 add( module, "lower", String.class ); |
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33 add( module, "match", String.class, String.class, Integer.class ); |
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34 add( module, "rep", String.class, Integer.TYPE, String.class ); |
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35 add( module, "reverse", String.class ); |
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36 add( module, "sub", String.class, Integer.TYPE, Integer.class ); |
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37 add( module, "upper", String.class ); |
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38 } catch(NoSuchMethodException e) { |
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39 throw new RuntimeException(e); |
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40 } |
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41 return module; |
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42 } |
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43 }; |
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44 |
48
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45 private static void add(LuanTable t,String method,Class<?>... parameterTypes) throws NoSuchMethodException { |
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46 t.put( method, new LuanJavaFunction(StringLib.class.getMethod(method,parameterTypes),null) ); |
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47 } |
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48 |
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49 private static final LuanTable mt = new LuanTable(); |
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50 static { |
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51 try { |
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52 add( mt, "__index", LuanState.class, String.class, Object.class ); |
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53 } catch(NoSuchMethodException e) { |
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54 throw new RuntimeException(e); |
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55 } |
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56 } |
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57 |
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58 private static final MetatableGetter mg = new MetatableGetter() { |
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59 public LuanTable getMetatable(Object obj) { |
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60 return obj instanceof String ? mt : null; |
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61 } |
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62 }; |
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63 |
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64 public static Object __index(LuanState luan,final String s,Object key) throws LuanException { |
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65 LuanTable mod = (LuanTable)luan.global().get("String"); |
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66 if( mod!=null ) { |
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67 Object obj = mod.get(key); |
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68 if( obj instanceof LuanFunction ) { |
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69 final LuanFunction fn = (LuanFunction)obj; |
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70 return new LuanFunction() { |
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71 @Override public Object call(LuanState luan,Object[] args) throws LuanException { |
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72 Object[] a = new Object[args.length+1]; |
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73 a[0] = s; |
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74 System.arraycopy(args,0,a,1,args.length); |
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75 return fn.call(luan,a); |
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76 } |
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77 }; |
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78 } |
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79 } |
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80 if( luan.global().get("Java") != null ) |
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81 return JavaLib.__index(luan,s,key); |
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82 return null; |
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83 } |
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84 |
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85 static int start(String s,int i) { |
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86 return i==0 ? 0 : i > 0 ? i - 1 : s.length() + i; |
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87 } |
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88 |
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89 static int start(String s,Integer i,int dflt) { |
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90 return i==null ? dflt : start(s,i); |
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91 } |
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92 |
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93 static int end(String s,int i) { |
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94 return i==0 ? 0 : i > 0 ? i : s.length() + i + 1; |
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95 } |
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96 |
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97 static int end(String s,Integer i,int dflt) { |
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98 return i==null ? dflt : end(s,i); |
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99 } |
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100 |
113
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101 public static byte[] to_binary(String s) { |
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102 return s.getBytes(); |
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103 } |
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104 |
113
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105 public static int[] to_integers(String s) { |
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106 char[] a = s.toCharArray(); |
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107 int[] chars = new int[a.length]; |
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108 for( int i=0; i<a.length; i++ ) { |
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109 chars[i] = a[i]; |
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110 } |
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111 return chars; |
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112 } |
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113 |
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114 public static String from_integers(int... chars) { |
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115 char[] a = new char[chars.length]; |
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116 for( int i=0; i<chars.length; i++ ) { |
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117 a[i] = (char)chars[i]; |
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118 } |
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119 return new String(a); |
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120 } |
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121 |
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122 public static int len(String s) { |
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123 return s.length(); |
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124 } |
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125 |
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126 public static String lower(String s) { |
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127 return s.toLowerCase(); |
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128 } |
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129 |
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130 public static String upper(String s) { |
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131 return s.toUpperCase(); |
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132 } |
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133 |
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134 public static String reverse(String s) { |
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135 return new StringBuilder(s).reverse().toString(); |
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136 } |
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137 |
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138 public static String rep(String s,int n,String sep) { |
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139 if( n < 1 ) |
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140 return ""; |
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141 StringBuilder buf = new StringBuilder(s); |
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142 while( --n > 0 ) { |
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143 if( sep != null ) |
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144 buf.append(sep); |
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145 buf.append(s); |
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146 } |
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147 return buf.toString(); |
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148 } |
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149 |
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150 public static String sub(String s,int i,Integer j) { |
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151 int start = start(s,i); |
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152 int end = end(s,j,s.length()); |
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153 return s.substring(start,end); |
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154 } |
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155 |
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156 public static int[] find(String s,String pattern,Integer init,Boolean plain) { |
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157 int start = start(s,init,0); |
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158 if( Boolean.TRUE.equals(plain) ) { |
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159 int i = s.indexOf(pattern,start); |
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160 return i == -1 ? null : new int[]{i+1,i+pattern.length()}; |
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161 } |
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162 Matcher m = Pattern.compile(pattern).matcher(s); |
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163 return m.find(start) ? new int[]{m.start()+1,m.end()} : null; |
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164 } |
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165 |
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166 public static String[] match(String s,String pattern,Integer init) { |
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167 int start = start(s,init,0); |
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168 Matcher m = Pattern.compile(pattern).matcher(s); |
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169 if( !m.find(start) ) |
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170 return null; |
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171 final int n = m.groupCount(); |
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172 if( n == 0 ) |
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173 return new String[]{m.group()}; |
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174 String[] rtn = new String[n]; |
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175 for( int i=0; i<n; i++ ) { |
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176 rtn[i] = m.group(i); |
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177 } |
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178 return rtn; |
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179 } |
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180 |
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181 public static LuanFunction gmatch(String s,String pattern) { |
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182 final Matcher m = Pattern.compile(pattern).matcher(s); |
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183 return new LuanFunction() { |
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184 @Override public Object call(LuanState luan,Object[] args) { |
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185 if( !m.find() ) |
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186 return null; |
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187 final int n = m.groupCount(); |
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188 if( n == 0 ) |
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189 return m.group(); |
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190 String[] rtn = new String[n]; |
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191 for( int i=0; i<n; i++ ) { |
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192 rtn[i] = m.group(i); |
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193 } |
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194 return rtn; |
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195 } |
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196 }; |
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197 } |
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198 |
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199 public static Object[] gsub(LuanState luan,String s,String pattern,Object repl,Integer n) throws LuanException { |
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200 int max = n==null ? Integer.MAX_VALUE : n; |
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201 final Matcher m = Pattern.compile(pattern).matcher(s); |
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202 if( repl instanceof String ) { |
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203 String replacement = (String)repl; |
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204 int i = 0; |
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205 StringBuffer sb = new StringBuffer(); |
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206 while( i<max && m.find() ) { |
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207 m.appendReplacement(sb,replacement); |
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208 i++; |
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209 } |
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210 m.appendTail(sb); |
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211 return new Object[]{ sb.toString(), i }; |
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212 } |
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213 if( repl instanceof LuanTable ) { |
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214 LuanTable t = (LuanTable)repl; |
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215 int i = 0; |
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216 StringBuffer sb = new StringBuffer(); |
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217 while( i<max && m.find() ) { |
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218 String match = m.groupCount()==0 ? m.group() : m.group(1); |
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219 Object val = t.get(match); |
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220 if( Luan.toBoolean(val) ) { |
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221 String replacement = Luan.asString(val); |
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222 if( replacement==null ) |
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223 throw luan.JAVA.exception( "invalid replacement value (a "+Luan.type(val)+")" ); |
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224 m.appendReplacement(sb,replacement); |
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225 } |
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226 i++; |
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227 } |
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228 m.appendTail(sb); |
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229 return new Object[]{ sb.toString(), i }; |
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230 } |
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231 if( repl instanceof LuanFunction ) { |
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232 LuanFunction fn = (LuanFunction)repl; |
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233 int i = 0; |
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234 StringBuffer sb = new StringBuffer(); |
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235 while( i<max && m.find() ) { |
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236 Object[] args; |
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237 final int count = m.groupCount(); |
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238 if( count == 0 ) { |
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239 args = new Object[]{m.group()}; |
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240 } else { |
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241 args = new Object[count]; |
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242 for( int j=0; j<count; j++ ) { |
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243 args[j] = m.group(j); |
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244 } |
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245 } |
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246 Object val = Luan.first( luan.JAVA.call(fn,"repl-arg",args) ); |
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247 if( Luan.toBoolean(val) ) { |
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248 String replacement = Luan.asString(val); |
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249 if( replacement==null ) |
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250 throw luan.JAVA.exception( "invalid replacement value (a "+Luan.type(val)+")" ); |
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251 m.appendReplacement(sb,replacement); |
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252 } |
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253 i++; |
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254 } |
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255 m.appendTail(sb); |
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256 return new Object[]{ sb.toString(), i }; |
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257 } |
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258 throw luan.JAVA.exception( "bad argument #3 to 'gsub' (string/function/table expected)" ); |
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259 } |
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260 |
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261 // note - String.format() is too stupid to convert between ints and floats. |
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262 public static String format(String format,Object... args) { |
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263 return String.format(format,args); |
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264 } |
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265 |
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266 } |