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annotate src/luan/modules/StringLuan.java @ 1802:ca98dee04e08 default tip

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add Parsers.json_null
author Franklin Schmidt <fschmidt@gmail.com>
date Sun, 21 Apr 2024 21:25:15 -0600
parents 1725fdb6c4f5
children
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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2
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3 import java.security.NoSuchAlgorithmException;
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4 import java.util.Arrays;
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5 import goodjava.util.GoodUtils;
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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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11
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12 public final class StringLuan {
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14 static int start(String s,int i) {
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15 int len = s.length();
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16 return i==0 ? 0 : i > 0 ? Math.min(i-1,len) : Math.max(len+i,0);
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17 }
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19 static int start(String s,Integer i,int dflt) {
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20 return i==null ? dflt : start(s,i);
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21 }
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23 static int end(String s,int i) {
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24 int len = s.length();
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25 return i==0 ? 0 : i > 0 ? Math.min(i,len) : Math.max(len+i+1,0);
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26 }
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28 static int end(String s,Integer i,int dflt) {
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29 return i==null ? dflt : end(s,i);
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30 }
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31
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32 public static Integer[] unicode(String s,Integer i,Integer j) throws LuanException {
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33 Utils.checkNotNull(s);
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34 int start = start(s,i,0);
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35 int end = end(s,j,start+1);
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36 Integer[] chars = new Integer[end-start];
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37 for( int k=0; k<chars.length; k++ ) {
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38 chars[k] = (int)s.charAt(start+k);
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39 }
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40 return chars;
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41 }
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42
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43 public static String char_(int... chars) {
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44 char[] a = new char[chars.length];
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45 for( int i=0; i<chars.length; i++ ) {
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46 a[i] = (char)chars[i];
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47 }
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48 return new String(a);
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49 }
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50
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51 public static byte[] to_binary(String s) {
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52 return s.getBytes();
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53 }
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54
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55 public static String lower(String s) throws LuanException {
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56 Utils.checkNotNull(s);
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57 return s.toLowerCase();
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58 }
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59
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60 public static String upper(String s) throws LuanException {
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61 Utils.checkNotNull(s);
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62 return s.toUpperCase();
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63 }
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64
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65 public static String trim(String s) throws LuanException {
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66 Utils.checkNotNull(s);
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67 return s.trim();
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68 }
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69
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70 public static String reverse(String s) throws LuanException {
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71 Utils.checkNotNull(s);
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72 return new StringBuilder(s).reverse().toString();
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73 }
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74
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75 public static String repeated(String s,int n,String sep) {
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76 if( n < 1 )
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77 return "";
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78 StringBuilder buf = new StringBuilder(s);
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79 while( --n > 0 ) {
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80 if( sep != null )
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81 buf.append(sep);
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82 buf.append(s);
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83 }
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84 return buf.toString();
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85 }
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86
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87 public static String sub(String s,int i,Integer j) throws LuanException {
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88 Utils.checkNotNull(s);
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89 int start = start(s,i);
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90 int end = end(s,j,s.length());
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91 return s.substring(start,end);
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92 }
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93
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94 public static Object[] find(String s,String s2,Integer init) {
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95 int start = start(s,init,0);
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96 int i = s.indexOf(s2,start);
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97 return i == -1 ? null : new Integer[]{i+1,i+s2.length()};
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98 }
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99
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100 // note - String.format() is too stupid to convert between ints and floats.
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101 public static String format(String format,Object... args) {
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102 return String.format(format,args);
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103 }
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104
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105 public static String encode(String s) {
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106 return Luan.stringEncode(s);
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107 }
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108
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109 public static Number to_number(String s,Integer base) throws LuanException {
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110 Utils.checkNotNull(s);
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111 try {
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112 if( base == null ) {
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113 return Double.valueOf(s);
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114 } else {
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115 return Long.valueOf(s,base);
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116 }
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117 } catch(NumberFormatException e) {}
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118 return null;
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119 }
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120
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121 public static String[] split(String s,String s2,Integer limit) throws LuanException {
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122 Utils.checkNotNull(s);
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123 Utils.checkNotNull(s2,2);
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124 int n = limit==null ? -1 : limit;
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125 return GoodUtils.split(s,s2,n);
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126 }
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127
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128 public static String digest_message(String algorithm,String input) throws LuanException, NoSuchAlgorithmException {
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129 Utils.checkNotNull(algorithm,1);
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130 Utils.checkNotNull(input,2);
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131 return BinaryLuan.to_hex( BinaryLuan.digest_message( algorithm, input.getBytes() ) );
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132 }
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133
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134 public static boolean contains(String s,String s2) throws LuanException {
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135 Utils.checkNotNull(s);
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136 Utils.checkNotNull(s2,2);
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137 return s.contains(s2);
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138 }
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139
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140 public static boolean starts_with(String s,String s2) throws LuanException {
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141 Utils.checkNotNull(s);
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142 Utils.checkNotNull(s2,2);
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143 return s.startsWith(s2);
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144 }
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145
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146 public static boolean ends_with(String s,String s2) throws LuanException {
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147 Utils.checkNotNull(s);
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148 Utils.checkNotNull(s2,2);
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149 return s.endsWith(s2);
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150 }
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151
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152 public static String replace(String s,String target,String replacement) throws LuanException {
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153 Utils.checkNotNull(s);
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154 Utils.checkNotNull(target,2);
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155 Utils.checkNotNull(replacement,3);
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156 return GoodUtils.replace(s,target,replacement);
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157 }
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158
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159 }