Mercurial Hosting > luan
annotate src/luan/lib/StringLib.java @ 87:eaf37cfa30c2
fix string.gsub()
git-svn-id: https://luan-java.googlecode.com/svn/trunk@88 21e917c8-12df-6dd8-5cb6-c86387c605b9
author | fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9> |
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date | Wed, 27 Feb 2013 19:42:09 +0000 |
parents | 6db8f286fa6c |
children | 6ca02b188dba |
rev | line source |
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43
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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.LuanLoader; |
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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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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 LuanLoader LOADER = new LuanLoader() { |
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20 @Override protected void load(LuanState luan) { |
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21 LuanTable module = new LuanTable(); |
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22 try { |
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23 module.put( "byte", new LuanJavaFunction(StringLib.class.getMethod("byte_",String.class,Integer.class,Integer.class),null) ); |
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24 module.put( "char", new LuanJavaFunction(StringLib.class.getMethod("char_",new byte[0].getClass()),null) ); |
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25 add( module, "find", String.class, String.class, Integer.class, Boolean.class ); |
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26 add( module, "format", String.class, new Object[0].getClass() ); |
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27 add( module, "gmatch", String.class, String.class ); |
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28 add( module, "gsub", LuanState.class, String.class, String.class, Object.class, Integer.class ); |
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29 add( module, "len", String.class ); |
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30 add( module, "lower", String.class ); |
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31 add( module, "match", String.class, String.class, Integer.class ); |
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32 add( module, "rep", String.class, Integer.TYPE, String.class ); |
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33 add( module, "reverse", String.class ); |
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34 add( module, "sub", String.class, Integer.TYPE, Integer.class ); |
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35 add( module, "upper", String.class ); |
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36 } catch(NoSuchMethodException e) { |
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37 throw new RuntimeException(e); |
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38 } |
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39 luan.loaded().put(NAME,module); |
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40 } |
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41 }; |
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42 |
48
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43 private static void add(LuanTable t,String method,Class<?>... parameterTypes) throws NoSuchMethodException { |
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44 t.put( method, new LuanJavaFunction(StringLib.class.getMethod(method,parameterTypes),null) ); |
43
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45 } |
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46 |
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47 static int start(String s,int i) { |
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48 return i==0 ? 0 : i > 0 ? i - 1 : s.length() + i; |
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49 } |
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50 |
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51 static int start(String s,Integer i,int dflt) { |
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52 return i==null ? dflt : start(s,i); |
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53 } |
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54 |
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55 static int end(String s,int i) { |
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56 return i==0 ? 0 : i > 0 ? i : s.length() + i + 1; |
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57 } |
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58 |
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59 static int end(String s,Integer i,int dflt) { |
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60 return i==null ? dflt : end(s,i); |
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61 } |
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62 |
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63 public static byte[] byte_(String s,Integer i,Integer j) { |
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64 int start = start(s,i,0); |
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65 int end = end(s,j,start+1); |
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66 return s.substring(start,end).getBytes(); |
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67 } |
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68 |
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69 public static String char_(byte... bytes) { |
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70 return new String(bytes); |
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71 } |
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72 |
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73 public static int len(String s) { |
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74 return s.length(); |
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75 } |
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76 |
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77 public static String lower(String s) { |
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78 return s.toLowerCase(); |
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79 } |
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80 |
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81 public static String upper(String s) { |
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82 return s.toUpperCase(); |
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83 } |
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84 |
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85 public static String reverse(String s) { |
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86 return new StringBuilder(s).reverse().toString(); |
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87 } |
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88 |
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89 public static String rep(String s,int n,String sep) { |
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90 if( n < 1 ) |
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91 return ""; |
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92 StringBuilder buf = new StringBuilder(s); |
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93 while( --n > 0 ) { |
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94 if( sep != null ) |
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95 buf.append(sep); |
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96 buf.append(s); |
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97 } |
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98 return buf.toString(); |
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99 } |
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100 |
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101 public static String sub(String s,int i,Integer j) { |
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102 int start = start(s,i); |
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103 int end = end(s,j,s.length()); |
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104 return s.substring(start,end); |
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105 } |
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106 |
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107 public static int[] find(String s,String pattern,Integer init,Boolean plain) { |
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108 int start = start(s,init,0); |
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109 if( Boolean.TRUE.equals(plain) ) { |
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110 int i = s.indexOf(pattern,start); |
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111 return i == -1 ? null : new int[]{i+1,i+pattern.length()}; |
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112 } |
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113 Matcher m = Pattern.compile(pattern).matcher(s); |
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114 return m.find(start) ? new int[]{m.start()+1,m.end()} : null; |
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115 } |
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116 |
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117 public static String[] match(String s,String pattern,Integer init) { |
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118 int start = start(s,init,0); |
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119 Matcher m = Pattern.compile(pattern).matcher(s); |
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120 if( !m.find(start) ) |
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121 return null; |
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122 final int n = m.groupCount(); |
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123 if( n == 0 ) |
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124 return new String[]{m.group()}; |
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125 String[] rtn = new String[n]; |
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126 for( int i=0; i<n; i++ ) { |
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127 rtn[i] = m.group(i); |
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128 } |
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129 return rtn; |
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130 } |
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131 |
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132 public static LuanFunction gmatch(String s,String pattern) { |
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133 final Matcher m = Pattern.compile(pattern).matcher(s); |
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134 return new LuanFunction() { |
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135 public Object[] call(LuanState luan,Object[] args) { |
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136 if( !m.find() ) |
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137 return LuanFunction.EMPTY; |
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138 final int n = m.groupCount(); |
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139 if( n == 0 ) |
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140 return new String[]{m.group()}; |
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141 String[] rtn = new String[n]; |
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142 for( int i=0; i<n; i++ ) { |
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143 rtn[i] = m.group(i); |
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144 } |
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145 return rtn; |
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146 } |
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147 }; |
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148 } |
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149 |
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150 public static Object[] gsub(LuanState luan,String s,String pattern,Object repl,Integer n) throws LuanException { |
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151 int max = n==null ? Integer.MAX_VALUE : n; |
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152 final Matcher m = Pattern.compile(pattern).matcher(s); |
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153 if( repl instanceof String ) { |
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154 String replacement = (String)repl; |
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155 int i = 0; |
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156 StringBuffer sb = new StringBuffer(); |
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157 while( i<max && m.find() ) { |
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158 m.appendReplacement(sb,replacement); |
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159 i++; |
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160 } |
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161 m.appendTail(sb); |
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162 return new Object[]{ sb.toString(), i }; |
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163 } |
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164 if( repl instanceof LuanTable ) { |
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165 LuanTable t = (LuanTable)repl; |
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166 int i = 0; |
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167 StringBuffer sb = new StringBuffer(); |
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168 while( i<max && m.find() ) { |
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169 String match = m.groupCount()==0 ? m.group() : m.group(1); |
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170 Object val = t.get(match); |
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171 if( Luan.toBoolean(val) ) { |
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172 String replacement = Luan.asString(val); |
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173 if( replacement==null ) |
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174 throw new LuanException( luan, LuanElement.JAVA, "invalid replacement value (a "+Luan.type(val)+")" ); |
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175 m.appendReplacement(sb,replacement); |
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176 } |
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177 i++; |
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178 } |
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179 m.appendTail(sb); |
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180 return new Object[]{ sb.toString(), i }; |
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181 } |
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182 if( repl instanceof LuanFunction ) { |
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183 LuanFunction fn = (LuanFunction)repl; |
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184 int i = 0; |
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185 StringBuffer sb = new StringBuffer(); |
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186 while( i<max && m.find() ) { |
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187 Object[] args; |
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188 final int count = m.groupCount(); |
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189 if( count == 0 ) { |
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190 args = new Object[]{m.group()}; |
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191 } else { |
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192 args = new Object[count]; |
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193 for( int j=0; j<count; j++ ) { |
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194 args[j] = m.group(j); |
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195 } |
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196 } |
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197 Object val = Luan.first( luan.call(fn,LuanElement.JAVA,"repl-arg",args) ); |
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198 if( Luan.toBoolean(val) ) { |
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199 String replacement = Luan.asString(val); |
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200 if( replacement==null ) |
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201 throw new LuanException( luan, LuanElement.JAVA, "invalid replacement value (a "+Luan.type(val)+")" ); |
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202 m.appendReplacement(sb,replacement); |
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203 } |
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204 i++; |
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205 } |
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206 m.appendTail(sb); |
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207 return new Object[]{ sb.toString(), i }; |
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208 } |
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209 throw new LuanException( luan, LuanElement.JAVA, "bad argument #3 to 'gsub' (string/function/table expected)" ); |
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210 } |
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211 |
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212 // note - String.format() is too stupid to convert between ints and floats. |
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213 public static String format(String format,Object... args) { |
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214 return String.format(format,args); |
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215 } |
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216 |
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217 } |