Mercurial Hosting > luan
annotate src/luan/modules/StringLuan.java @ 1333:25746915a241
merge Luan and LuanState
author | Franklin Schmidt <fschmidt@gmail.com> |
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date | Tue, 12 Feb 2019 22:33:40 -0700 |
parents | 9fa8b8389578 |
children | c88b486a9511 |
rev | line source |
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1 package luan.modules; |
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2 |
757 | 3 import java.util.Arrays; |
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4 import java.util.regex.Pattern; |
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5 import java.util.regex.Matcher; |
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6 import luan.Luan; |
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7 import luan.LuanTable; |
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8 import luan.LuanFunction; |
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9 import luan.LuanException; |
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10 import luan.LuanMethod; |
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11 |
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12 |
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13 public final class StringLuan { |
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14 |
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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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19 |
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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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23 |
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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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28 |
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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 @LuanMethod 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,1); |
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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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43 |
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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 @LuanMethod 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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75 |
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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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94 |
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95 @LuanMethod 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 @LuanMethod 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 final Matcher m = Pattern.compile(pattern).matcher(s); |
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132 return new LuanFunction() { |
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133 @Override public Object call(Luan luan,Object[] args) { |
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134 if( !m.find() ) |
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135 return null; |
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136 final int n = m.groupCount(); |
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137 if( n == 0 ) |
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138 return m.group(); |
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139 String[] rtn = new String[n]; |
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140 for( int i=0; i<n; i++ ) { |
138
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141 rtn[i] = m.group(i+1); |
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142 } |
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143 return rtn; |
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144 } |
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145 }; |
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146 } |
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147 |
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148 @LuanMethod public static Object[] gsub(Luan luan,String s,String pattern,Object repl,Integer n) throws LuanException { |
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149 Utils.checkNotNull(s); |
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150 int max = n==null ? Integer.MAX_VALUE : n; |
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151 final Matcher m = Pattern.compile(pattern).matcher(s); |
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152 if( repl instanceof String ) { |
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153 String replacement = (String)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 m.appendReplacement(sb,replacement); |
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158 i++; |
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159 } |
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160 m.appendTail(sb); |
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161 return new Object[]{ sb.toString(), i }; |
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162 } |
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163 if( repl instanceof LuanTable ) { |
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164 LuanTable t = (LuanTable)repl; |
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165 int i = 0; |
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166 StringBuffer sb = new StringBuffer(); |
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167 while( i<max && m.find() ) { |
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168 String match = m.groupCount()==0 ? m.group() : m.group(1); |
1267 | 169 Object val = t.get(match); |
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170 if( val != null ) { |
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171 String replacement = luan.toString(val); |
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172 m.appendReplacement(sb,replacement); |
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173 } |
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174 i++; |
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175 } |
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176 m.appendTail(sb); |
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177 return new Object[]{ sb.toString(), i }; |
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178 } |
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179 if( repl instanceof LuanFunction ) { |
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180 LuanFunction fn = (LuanFunction)repl; |
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181 int i = 0; |
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182 StringBuffer sb = new StringBuffer(); |
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183 while( i<max && m.find() ) { |
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184 Object[] args; |
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185 final int count = m.groupCount(); |
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186 if( count == 0 ) { |
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187 args = new String[]{m.group()}; |
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188 } else { |
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189 args = new String[count]; |
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190 for( int j=0; j<count; j++ ) { |
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191 args[j] = m.group(j+1); |
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192 } |
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193 } |
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194 Object val = Luan.first( fn.call(luan,args) ); |
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195 if( val != null ) { |
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196 String replacement = luan.toString(val); |
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197 m.appendReplacement(sb,replacement); |
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198 } |
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199 i++; |
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200 } |
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201 m.appendTail(sb); |
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202 return new Object[]{ sb.toString(), i }; |
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203 } |
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204 throw new LuanException( "bad argument #3 to 'gsub' (string/function/table expected)" ); |
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205 } |
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206 |
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207 // note - String.format() is too stupid to convert between ints and floats. |
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208 public static String format(String format,Object... args) { |
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209 return String.format(format,args); |
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210 } |
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211 |
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212 public static String concat(Luan luan,Object... args) throws LuanException { |
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213 StringBuilder sb = new StringBuilder(); |
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214 for( Object arg : args ) { |
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215 sb.append( luan.toString(arg) ); |
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216 } |
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217 return sb.toString(); |
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218 } |
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219 |
420 | 220 public static String encode(String s) { |
221 return Luan.stringEncode(s); | |
222 } | |
223 | |
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224 public static Number to_number(String s,Integer base) throws LuanException { |
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225 Utils.checkNotNull(s); |
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226 try { |
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227 if( base == null ) { |
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228 return Double.valueOf(s); |
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229 } else { |
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230 return Long.valueOf(s,base); |
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231 } |
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232 } catch(NumberFormatException e) {} |
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233 return null; |
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234 } |
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235 |
702 | 236 public static boolean matches(String s,String pattern) throws LuanException { |
237 Utils.checkNotNull(s); | |
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238 return Pattern.compile(pattern).matcher(s).find(); |
456 | 239 } |
240 | |
1195 | 241 @LuanMethod public static String[] split(String s,String pattern,Integer limit) throws LuanException { |
757 | 242 Utils.checkNotNull(s); |
1195 | 243 int n = limit==null ? -1 : limit; |
244 return s.split(pattern,n); | |
757 | 245 } |
246 | |
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247 } |