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annotate src/luan/modules/StringLuan.java @ 1717:c637a2a1023d

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add String.replace
author Franklin Schmidt <fschmidt@gmail.com>
date Mon, 25 Jul 2022 11:16:53 -0600
parents b82767112d8e
children 5603ee8e2a71
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
167
4c0131c2b650 merge luan/lib into modules
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1 package luan.modules;
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3 import java.security.NoSuchAlgorithmException;
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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 luan.Luan;
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8 import luan.LuanTable;
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9 import luan.LuanFunction;
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10 import luan.LuanException;
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12
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13 public final class StringLuan {
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15 static int start(String s,int i) {
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16 int len = s.length();
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17 return i==0 ? 0 : i > 0 ? Math.min(i-1,len) : Math.max(len+i,0);
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18 }
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20 static int start(String s,Integer i,int dflt) {
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21 return i==null ? dflt : start(s,i);
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22 }
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24 static int end(String s,int i) {
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25 int len = s.length();
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26 return i==0 ? 0 : i > 0 ? Math.min(i,len) : Math.max(len+i+1,0);
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27 }
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29 static int end(String s,Integer i,int dflt) {
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30 return i==null ? dflt : end(s,i);
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31 }
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32
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33 public static Integer[] unicode(String s,Integer i,Integer j) throws LuanException {
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34 Utils.checkNotNull(s);
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35 int start = start(s,i,0);
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36 int end = end(s,j,start+1);
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37 Integer[] chars = new Integer[end-start];
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38 for( int k=0; k<chars.length; k++ ) {
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39 chars[k] = (int)s.charAt(start+k);
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40 }
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41 return chars;
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42 }
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44 public static String char_(int... chars) {
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45 char[] a = new char[chars.length];
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46 for( int i=0; i<chars.length; i++ ) {
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47 a[i] = (char)chars[i];
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48 }
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49 return new String(a);
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50 }
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51
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52 public static byte[] to_binary(String s) {
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53 return s.getBytes();
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54 }
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55
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56 public static String lower(String s) throws LuanException {
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57 Utils.checkNotNull(s);
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58 return s.toLowerCase();
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59 }
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60
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61 public static String upper(String s) throws LuanException {
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62 Utils.checkNotNull(s);
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63 return s.toUpperCase();
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64 }
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65
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66 public static String trim(String s) throws LuanException {
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67 Utils.checkNotNull(s);
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68 return s.trim();
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69 }
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70
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71 public static String reverse(String s) throws LuanException {
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72 Utils.checkNotNull(s);
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73 return new StringBuilder(s).reverse().toString();
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74 }
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76 public static String rep(String s,int n,String sep) {
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77 if( n < 1 )
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78 return "";
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79 StringBuilder buf = new StringBuilder(s);
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80 while( --n > 0 ) {
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81 if( sep != null )
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82 buf.append(sep);
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83 buf.append(s);
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84 }
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85 return buf.toString();
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86 }
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87
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88 public static String sub(String s,int i,Integer j) throws LuanException {
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89 Utils.checkNotNull(s);
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90 int start = start(s,i);
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91 int end = end(s,j,s.length());
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92 return s.substring(start,end);
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93 }
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95 public static Object[] find(String s,String pattern,Integer init,Boolean plain) {
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96 int start = start(s,init,0);
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97 if( Boolean.TRUE.equals(plain) ) {
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98 int i = s.indexOf(pattern,start);
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99 return i == -1 ? null : new Integer[]{i+1,i+pattern.length()};
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100 }
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101 Matcher m = Pattern.compile(pattern).matcher(s);
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102 if( !m.find(start) )
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103 return null;
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104 int n = m.groupCount();
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105 Object[] rtn = new Object[2+n];
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106 rtn[0] = m.start() + 1;
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107 rtn[1] = m.end();
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108 for( int i=0; i<n; i++ ) {
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109 rtn[2+i] = m.group(i+1);
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110 }
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111 return rtn;
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112 }
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113
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114 public static String[] match(String s,String pattern,Integer init) {
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115 int start = start(s,init,0);
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116 Matcher m = Pattern.compile(pattern).matcher(s);
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117 if( !m.find(start) )
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118 return null;
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119 int n = m.groupCount();
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120 if( n == 0 )
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121 return new String[]{m.group()};
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122 String[] rtn = new String[n];
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123 for( int i=0; i<n; i++ ) {
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124 rtn[i] = m.group(i+1);
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125 }
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126 return rtn;
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127 }
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128
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129 public static LuanFunction gmatch(String s,String pattern) throws LuanException {
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130 Utils.checkNotNull(s);
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131 Utils.checkNotNull(pattern,2);
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132 final Matcher m = Pattern.compile(pattern).matcher(s);
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133 return new LuanFunction() {
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134 @Override public Object call(Luan luan,Object[] args) {
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135 if( !m.find() )
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136 return null;
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137 final int n = m.groupCount();
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138 if( n == 0 )
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139 return m.group();
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140 String[] rtn = new String[n];
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141 for( int i=0; i<n; i++ ) {
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142 rtn[i] = m.group(i+1);
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143 }
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144 return rtn;
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145 }
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146 };
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147 }
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148
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149 public static Object[] gsub(Luan luan,String s,String pattern,Object repl,Integer n) throws LuanException {
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150 Utils.checkNotNull(s);
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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(luan,match);
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171 if( val != null ) {
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172 String replacement = luan.luanToString(val);
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173 m.appendReplacement(sb,replacement);
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174 }
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175 i++;
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176 }
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177 m.appendTail(sb);
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178 return new Object[]{ sb.toString(), i };
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179 }
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180 if( repl instanceof LuanFunction ) {
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181 LuanFunction fn = (LuanFunction)repl;
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182 int i = 0;
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183 StringBuffer sb = new StringBuffer();
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184 while( i<max && m.find() ) {
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185 Object[] args;
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186 final int count = m.groupCount();
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187 if( count == 0 ) {
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188 args = new String[]{m.group()};
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189 } else {
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190 args = new String[count];
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191 for( int j=0; j<count; j++ ) {
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192 args[j] = m.group(j+1);
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193 }
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194 }
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195 Object val = Luan.first( fn.call(luan,args) );
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196 if( val != null ) {
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197 String replacement = luan.luanToString(val);
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198 m.appendReplacement(sb,replacement);
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199 }
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200 i++;
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201 }
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202 m.appendTail(sb);
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203 return new Object[]{ sb.toString(), i };
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204 }
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205 throw new LuanException( "bad argument #3 to 'gsub' (string/function/table expected)" );
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206 }
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207
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208 // note - String.format() is too stupid to convert between ints and floats.
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209 public static String format(String format,Object... args) {
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210 return String.format(format,args);
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211 }
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212
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213 public static String encode(String s) {
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214 return Luan.stringEncode(s);
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215 }
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216
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217 public static Number to_number(String s,Integer base) throws LuanException {
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218 Utils.checkNotNull(s);
448
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219 try {
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220 if( base == null ) {
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221 return Double.valueOf(s);
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222 } else {
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223 return Long.valueOf(s,base);
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224 }
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225 } catch(NumberFormatException e) {}
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226 return null;
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227 }
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228
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229 public static boolean matches(String s,String pattern) throws LuanException {
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230 Utils.checkNotNull(s);
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231 return Pattern.compile(pattern).matcher(s).find();
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232 }
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233
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234 public static String[] split(String s,String pattern,Integer limit) throws LuanException {
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235 Utils.checkNotNull(s);
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236 Utils.checkNotNull(pattern,2);
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237 int n = limit==null ? -1 : limit;
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238 return s.split(pattern,n);
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239 }
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240
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241 public static String digest_message(String algorithm,String input) throws LuanException, NoSuchAlgorithmException {
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242 Utils.checkNotNull(algorithm,1);
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243 Utils.checkNotNull(input,2);
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244 return BinaryLuan.to_hex( BinaryLuan.digest_message( algorithm, input.getBytes() ) );
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245 }
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246
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247 public static boolean contains(String s,String s2) throws LuanException {
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248 Utils.checkNotNull(s);
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249 Utils.checkNotNull(s2,2);
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250 return s.contains(s2);
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251 }
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252
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253 public static boolean starts_with(String s,String s2) throws LuanException {
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254 Utils.checkNotNull(s);
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255 Utils.checkNotNull(s2,2);
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256 return s.startsWith(s2);
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257 }
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258
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259 public static boolean ends_with(String s,String s2) throws LuanException {
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260 Utils.checkNotNull(s);
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261 Utils.checkNotNull(s2,2);
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262 return s.endsWith(s2);
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263 }
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264
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265 public static String replace(String s,String target,String replacement) throws LuanException {
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266 Utils.checkNotNull(s);
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267 Utils.checkNotNull(target,2);
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268 Utils.checkNotNull(replacement,3);
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269 return s.replace(target,replacement);
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270 }
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271
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272 }