Mercurial Hosting > luan
annotate src/luan/modules/StringLuan.java @ 1721:5c69d2e8bd75
no regex in String.find and String.split
author | Franklin Schmidt <fschmidt@gmail.com> |
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date | Tue, 26 Jul 2022 12:44:52 -0600 |
parents | 5603ee8e2a71 |
children | 7d2ab44f7a59 |
rev | line source |
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167
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1 package luan.modules; |
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2 |
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3 import java.security.NoSuchAlgorithmException; |
757 | 4 import java.util.Arrays; |
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5 import java.util.regex.Pattern; |
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6 import java.util.regex.Matcher; |
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7 import goodjava.util.GoodUtils; |
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8 import luan.Luan; |
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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 |
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13 |
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14 public final class StringLuan { |
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15 |
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16 static int start(String s,int i) { |
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17 int len = s.length(); |
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18 return i==0 ? 0 : i > 0 ? Math.min(i-1,len) : Math.max(len+i,0); |
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19 } |
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20 |
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21 static int start(String s,Integer i,int dflt) { |
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22 return i==null ? dflt : start(s,i); |
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23 } |
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24 |
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25 static int end(String s,int i) { |
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26 int len = s.length(); |
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27 return i==0 ? 0 : i > 0 ? Math.min(i,len) : Math.max(len+i+1,0); |
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28 } |
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29 |
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30 static int end(String s,Integer i,int dflt) { |
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31 return i==null ? dflt : end(s,i); |
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32 } |
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33 |
1335 | 34 public static Integer[] unicode(String s,Integer i,Integer j) throws LuanException { |
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35 Utils.checkNotNull(s); |
1505 | 36 int start = start(s,i,0); |
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37 int end = end(s,j,start+1); |
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38 Integer[] chars = new Integer[end-start]; |
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39 for( int k=0; k<chars.length; k++ ) { |
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40 chars[k] = (int)s.charAt(start+k); |
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41 } |
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42 return chars; |
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43 } |
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44 |
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45 public static String char_(int... chars) { |
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46 char[] a = new char[chars.length]; |
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47 for( int i=0; i<chars.length; i++ ) { |
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48 a[i] = (char)chars[i]; |
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49 } |
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50 return new String(a); |
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51 } |
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52 |
1335 | 53 public static byte[] to_binary(String s) { |
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54 return s.getBytes(); |
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55 } |
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56 |
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57 public static String lower(String s) throws LuanException { |
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58 Utils.checkNotNull(s); |
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59 return s.toLowerCase(); |
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60 } |
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61 |
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62 public static String upper(String s) throws LuanException { |
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63 Utils.checkNotNull(s); |
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64 return s.toUpperCase(); |
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65 } |
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66 |
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67 public static String trim(String s) throws LuanException { |
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68 Utils.checkNotNull(s); |
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69 return s.trim(); |
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70 } |
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71 |
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72 public static String reverse(String s) throws LuanException { |
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73 Utils.checkNotNull(s); |
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74 return new StringBuilder(s).reverse().toString(); |
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75 } |
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76 |
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77 public static String repeated(String s,int n,String sep) { |
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78 if( n < 1 ) |
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79 return ""; |
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80 StringBuilder buf = new StringBuilder(s); |
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81 while( --n > 0 ) { |
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82 if( sep != null ) |
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83 buf.append(sep); |
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84 buf.append(s); |
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85 } |
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86 return buf.toString(); |
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87 } |
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88 |
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89 public static String sub(String s,int i,Integer j) throws LuanException { |
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90 Utils.checkNotNull(s); |
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91 int start = start(s,i); |
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92 int end = end(s,j,s.length()); |
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93 return s.substring(start,end); |
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94 } |
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95 |
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96 public static Object[] find(String s,String s2,Integer init) { |
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97 int start = start(s,init,0); |
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98 int i = s.indexOf(s2,start); |
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99 return i == -1 ? null : new Integer[]{i+1,i+s2.length()}; |
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100 } |
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101 |
1716 | 102 public static String[] match(String s,String pattern,Integer init) { |
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103 int start = start(s,init,0); |
1716 | 104 Matcher m = Pattern.compile(pattern).matcher(s); |
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105 if( !m.find(start) ) |
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106 return null; |
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107 int n = m.groupCount(); |
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108 if( n == 0 ) |
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109 return new String[]{m.group()}; |
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110 String[] rtn = new String[n]; |
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111 for( int i=0; i<n; i++ ) { |
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112 rtn[i] = m.group(i+1); |
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113 } |
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114 return rtn; |
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115 } |
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116 |
1716 | 117 public static LuanFunction gmatch(String s,String pattern) throws LuanException { |
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118 Utils.checkNotNull(s); |
1716 | 119 Utils.checkNotNull(pattern,2); |
120 final Matcher m = Pattern.compile(pattern).matcher(s); | |
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121 return new LuanFunction() { |
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122 @Override public Object call(Luan luan,Object[] args) { |
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123 if( !m.find() ) |
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124 return null; |
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125 final int n = m.groupCount(); |
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126 if( n == 0 ) |
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127 return m.group(); |
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128 String[] rtn = new String[n]; |
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129 for( int i=0; i<n; i++ ) { |
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130 rtn[i] = m.group(i+1); |
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131 } |
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132 return rtn; |
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133 } |
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134 }; |
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135 } |
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136 |
1716 | 137 public static Object[] gsub(Luan luan,String s,String pattern,Object repl,Integer n) throws LuanException { |
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138 Utils.checkNotNull(s); |
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139 int max = n==null ? Integer.MAX_VALUE : n; |
1716 | 140 final Matcher m = Pattern.compile(pattern).matcher(s); |
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141 if( repl instanceof String ) { |
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142 String replacement = (String)repl; |
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143 int i = 0; |
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144 StringBuffer sb = new StringBuffer(); |
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145 while( i<max && m.find() ) { |
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146 m.appendReplacement(sb,replacement); |
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147 i++; |
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148 } |
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149 m.appendTail(sb); |
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150 return new Object[]{ sb.toString(), i }; |
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151 } |
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152 if( repl instanceof LuanTable ) { |
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153 LuanTable t = (LuanTable)repl; |
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154 int i = 0; |
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155 StringBuffer sb = new StringBuffer(); |
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156 while( i<max && m.find() ) { |
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157 String match = m.groupCount()==0 ? m.group() : m.group(1); |
1562 | 158 Object val = t.get(luan,match); |
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159 if( val != null ) { |
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160 String replacement = luan.luanToString(val); |
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161 m.appendReplacement(sb,replacement); |
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162 } |
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163 i++; |
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164 } |
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165 m.appendTail(sb); |
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166 return new Object[]{ sb.toString(), i }; |
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167 } |
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168 if( repl instanceof LuanFunction ) { |
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169 LuanFunction fn = (LuanFunction)repl; |
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170 int i = 0; |
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171 StringBuffer sb = new StringBuffer(); |
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172 while( i<max && m.find() ) { |
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173 Object[] args; |
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174 final int count = m.groupCount(); |
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175 if( count == 0 ) { |
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176 args = new String[]{m.group()}; |
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177 } else { |
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178 args = new String[count]; |
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179 for( int j=0; j<count; j++ ) { |
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180 args[j] = m.group(j+1); |
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181 } |
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182 } |
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183 Object val = Luan.first( fn.call(luan,args) ); |
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184 if( val != null ) { |
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185 String replacement = luan.luanToString(val); |
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186 m.appendReplacement(sb,replacement); |
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187 } |
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188 i++; |
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189 } |
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190 m.appendTail(sb); |
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191 return new Object[]{ sb.toString(), i }; |
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192 } |
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193 throw new LuanException( "bad argument #3 to 'gsub' (string/function/table expected)" ); |
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194 } |
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195 |
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196 // note - String.format() is too stupid to convert between ints and floats. |
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197 public static String format(String format,Object... args) { |
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198 return String.format(format,args); |
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199 } |
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200 |
420 | 201 public static String encode(String s) { |
202 return Luan.stringEncode(s); | |
203 } | |
204 | |
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205 public static Number to_number(String s,Integer base) throws LuanException { |
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206 Utils.checkNotNull(s); |
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207 try { |
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208 if( base == null ) { |
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209 return Double.valueOf(s); |
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210 } else { |
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211 return Long.valueOf(s,base); |
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212 } |
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213 } catch(NumberFormatException e) {} |
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214 return null; |
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215 } |
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216 |
1716 | 217 public static boolean matches(String s,String pattern) throws LuanException { |
702 | 218 Utils.checkNotNull(s); |
1716 | 219 return Pattern.compile(pattern).matcher(s).find(); |
456 | 220 } |
221 | |
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222 public static String[] split(String s,String s2,Integer limit) throws LuanException { |
757 | 223 Utils.checkNotNull(s); |
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224 Utils.checkNotNull(s2,2); |
1195 | 225 int n = limit==null ? -1 : limit; |
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226 return GoodUtils.split(s,s2,n); |
757 | 227 } |
228 | |
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229 public static String digest_message(String algorithm,String input) throws LuanException, NoSuchAlgorithmException { |
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230 Utils.checkNotNull(algorithm,1); |
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231 Utils.checkNotNull(input,2); |
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232 return BinaryLuan.to_hex( BinaryLuan.digest_message( algorithm, input.getBytes() ) ); |
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233 } |
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234 |
1716 | 235 public static boolean contains(String s,String s2) throws LuanException { |
236 Utils.checkNotNull(s); | |
237 Utils.checkNotNull(s2,2); | |
238 return s.contains(s2); | |
239 } | |
240 | |
241 public static boolean starts_with(String s,String s2) throws LuanException { | |
242 Utils.checkNotNull(s); | |
243 Utils.checkNotNull(s2,2); | |
244 return s.startsWith(s2); | |
245 } | |
246 | |
247 public static boolean ends_with(String s,String s2) throws LuanException { | |
248 Utils.checkNotNull(s); | |
249 Utils.checkNotNull(s2,2); | |
250 return s.endsWith(s2); | |
251 } | |
252 | |
1717 | 253 public static String replace(String s,String target,String replacement) throws LuanException { |
254 Utils.checkNotNull(s); | |
255 Utils.checkNotNull(target,2); | |
256 Utils.checkNotNull(replacement,3); | |
257 return s.replace(target,replacement); | |
258 } | |
259 | |
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260 } |