Mercurial Hosting > luan
annotate core/src/luan/modules/StringLuan.java @ 509:e3b0846dc2ef
throw exception for invalid indexes of string, binary, or java
author | Franklin Schmidt <fschmidt@gmail.com> |
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date | Fri, 22 May 2015 02:02:49 -0600 |
parents | 92c3d22745b8 |
children | 2da0bcb979b5 |
rev | line source |
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167
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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.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.LuanJavaFunction; |
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10 import luan.LuanElement; |
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11 import luan.LuanException; |
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12 import luan.LuanMethod; |
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13 import luan.LuanBit; |
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14 |
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15 |
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16 public final class StringLuan { |
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17 |
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18 public static Object __index(LuanBit bit,final String s,Object key) throws LuanException { |
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19 LuanState luan = bit.luan; |
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20 LuanTable mod = (LuanTable)PackageLuan.require(luan,"luan:String"); |
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21 Object obj = mod.get(luan,key); |
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22 if( obj instanceof LuanFunction ) { |
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23 final LuanFunction fn = (LuanFunction)obj; |
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24 return new LuanFunction() { |
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25 @Override public Object call(LuanState luan,Object[] args) throws LuanException { |
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26 Object[] a = new Object[args.length+1]; |
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27 a[0] = s; |
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28 System.arraycopy(args,0,a,1,args.length); |
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29 return fn.call(luan,a); |
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30 } |
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31 }; |
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32 } |
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33 if( luan.hasJava() ) { |
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34 Object rtn = JavaLuan.__index(luan,s,key); |
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35 if( rtn != JavaLuan.FAIL ) |
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36 return rtn; |
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37 } |
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38 if( bit.el != null ) |
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39 throw bit.exception( "invalid index ["+luan.toString(key)+"] for string ("+bit.el.text()+")" ) ; |
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40 else |
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41 throw bit.exception( "invalid index ["+luan.toString(key)+"] for string") ; |
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42 } |
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43 |
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44 static int start(String s,int i) { |
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45 int len = s.length(); |
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46 return i==0 ? 0 : i > 0 ? Math.min(i-1,len) : Math.max(len+i,0); |
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47 } |
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48 |
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49 static int start(String s,Integer i,int dflt) { |
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50 return i==null ? dflt : start(s,i); |
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51 } |
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52 |
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53 static int end(String s,int i) { |
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54 int len = s.length(); |
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55 return i==0 ? 0 : i > 0 ? Math.min(i,len) : Math.max(len+i+1,0); |
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56 } |
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57 |
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58 static int end(String s,Integer i,int dflt) { |
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59 return i==null ? dflt : end(s,i); |
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60 } |
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61 |
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62 @LuanMethod public static Integer[] unicode(LuanState luan,String s,Integer i,Integer j) throws LuanException { |
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63 Utils.checkNotNull(luan,s); |
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64 int start = start(s,i,1); |
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65 int end = end(s,j,start+1); |
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66 Integer[] chars = new Integer[end-start]; |
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67 for( int k=0; k<chars.length; k++ ) { |
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68 chars[k] = (int)s.charAt(start+k); |
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69 } |
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70 return chars; |
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71 } |
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72 |
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73 public static String char_(int... chars) { |
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74 char[] a = new char[chars.length]; |
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75 for( int i=0; i<chars.length; i++ ) { |
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76 a[i] = (char)chars[i]; |
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77 } |
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78 return new String(a); |
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79 } |
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80 |
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81 @LuanMethod public static byte[] to_binary(String s) { |
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82 return s.getBytes(); |
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83 } |
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84 |
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85 public static int len(LuanState luan,String s) throws LuanException { |
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86 Utils.checkNotNull(luan,s); |
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87 return s.length(); |
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88 } |
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89 |
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90 public static String lower(LuanState luan,String s) throws LuanException { |
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91 Utils.checkNotNull(luan,s); |
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92 return s.toLowerCase(); |
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93 } |
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94 |
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95 public static String upper(LuanState luan,String s) throws LuanException { |
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96 Utils.checkNotNull(luan,s); |
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97 return s.toUpperCase(); |
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98 } |
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99 |
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100 public static String trim(LuanState luan,String s) throws LuanException { |
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101 Utils.checkNotNull(luan,s); |
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102 return s.trim(); |
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103 } |
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104 |
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105 public static String reverse(LuanState luan,String s) throws LuanException { |
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106 Utils.checkNotNull(luan,s); |
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107 return new StringBuilder(s).reverse().toString(); |
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108 } |
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109 |
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110 public static String rep(String s,int n,String sep) { |
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111 if( n < 1 ) |
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112 return ""; |
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113 StringBuilder buf = new StringBuilder(s); |
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114 while( --n > 0 ) { |
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115 if( sep != null ) |
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116 buf.append(sep); |
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117 buf.append(s); |
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118 } |
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119 return buf.toString(); |
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120 } |
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121 |
251
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122 public static String sub(LuanState luan,String s,int i,Integer j) throws LuanException { |
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123 Utils.checkNotNull(luan,s); |
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124 int start = start(s,i); |
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125 int end = end(s,j,s.length()); |
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126 return s.substring(start,end); |
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127 } |
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128 |
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129 public static int[] find(String s,String pattern,Integer init,Boolean plain) { |
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130 int start = start(s,init,0); |
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131 if( Boolean.TRUE.equals(plain) ) { |
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132 int i = s.indexOf(pattern,start); |
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133 return i == -1 ? null : new int[]{i+1,i+pattern.length()}; |
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134 } |
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135 Matcher m = Pattern.compile(pattern).matcher(s); |
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136 return m.find(start) ? new int[]{m.start()+1,m.end()} : null; |
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137 } |
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138 |
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139 @LuanMethod public static String[] match(String s,String pattern,Integer init) { |
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140 int start = start(s,init,0); |
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141 Matcher m = Pattern.compile(pattern).matcher(s); |
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142 if( !m.find(start) ) |
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143 return null; |
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144 final int n = m.groupCount(); |
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145 if( n == 0 ) |
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146 return new String[]{m.group()}; |
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147 String[] rtn = new String[n]; |
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148 for( int i=0; i<n; i++ ) { |
161
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149 rtn[i] = m.group(i+1); |
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150 } |
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151 return rtn; |
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152 } |
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153 |
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154 public static LuanFunction gmatch(LuanState luan,String s,String pattern) throws LuanException { |
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155 Utils.checkNotNull(luan,s); |
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156 final Matcher m = Pattern.compile(pattern).matcher(s); |
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157 return new LuanFunction() { |
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158 @Override public Object call(LuanState luan,Object[] args) { |
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159 if( !m.find() ) |
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160 return null; |
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161 final int n = m.groupCount(); |
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162 if( n == 0 ) |
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163 return m.group(); |
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164 String[] rtn = new String[n]; |
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165 for( int i=0; i<n; i++ ) { |
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166 rtn[i] = m.group(i+1); |
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167 } |
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168 return rtn; |
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169 } |
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170 }; |
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171 } |
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172 |
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173 @LuanMethod public static Object[] gsub(LuanState luan,String s,String pattern,Object repl,Integer n) throws LuanException { |
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174 int max = n==null ? Integer.MAX_VALUE : n; |
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175 final Matcher m = Pattern.compile(pattern).matcher(s); |
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176 if( repl instanceof String ) { |
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177 String replacement = (String)repl; |
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178 int i = 0; |
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179 StringBuffer sb = new StringBuffer(); |
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180 while( i<max && m.find() ) { |
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181 m.appendReplacement(sb,replacement); |
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182 i++; |
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183 } |
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184 m.appendTail(sb); |
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185 return new Object[]{ sb.toString(), i }; |
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186 } |
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187 if( repl instanceof LuanTable ) { |
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188 LuanTable t = (LuanTable)repl; |
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189 int i = 0; |
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190 StringBuffer sb = new StringBuffer(); |
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191 while( i<max && m.find() ) { |
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192 String match = m.groupCount()==0 ? m.group() : m.group(1); |
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193 Object val = t.get(luan,match); |
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194 if( val != null ) { |
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195 String replacement = luan.checkString(val); |
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196 if( replacement==null ) |
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197 throw luan.exception( "invalid replacement value (a "+Luan.type(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 if( repl instanceof LuanFunction ) { |
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206 LuanFunction fn = (LuanFunction)repl; |
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207 int i = 0; |
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208 StringBuffer sb = new StringBuffer(); |
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209 while( i<max && m.find() ) { |
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210 Object[] args; |
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211 final int count = m.groupCount(); |
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212 if( count == 0 ) { |
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213 args = new Object[]{m.group()}; |
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214 } else { |
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215 args = new Object[count]; |
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216 for( int j=0; j<count; j++ ) { |
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217 args[j] = m.group(j); |
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218 } |
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219 } |
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220 Object val = Luan.first( luan.call(fn,"repl-arg",args) ); |
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221 if( val != null ) { |
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222 String replacement = luan.checkString(val); |
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223 if( replacement==null ) |
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224 throw luan.exception( "invalid replacement value (a "+Luan.type(val)+")" ); |
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225 m.appendReplacement(sb,replacement); |
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226 } |
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227 i++; |
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228 } |
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229 m.appendTail(sb); |
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230 return new Object[]{ sb.toString(), i }; |
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231 } |
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232 throw luan.exception( "bad argument #3 to 'gsub' (string/function/table expected)" ); |
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233 } |
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234 |
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235 // note - String.format() is too stupid to convert between ints and floats. |
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236 public static String format(String format,Object... args) { |
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237 return String.format(format,args); |
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238 } |
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239 |
289
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240 public static String concat(LuanState luan,Object... args) throws LuanException { |
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241 StringBuilder sb = new StringBuilder(); |
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242 for( Object arg : args ) { |
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243 sb.append( luan.toString(arg) ); |
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244 } |
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245 return sb.toString(); |
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246 } |
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247 |
420 | 248 public static String encode(String s) { |
249 return Luan.stringEncode(s); | |
250 } | |
251 | |
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252 public static Number to_number(LuanState luan,String s,Integer base) throws LuanException { |
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253 Utils.checkNotNull(luan,s); |
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254 try { |
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255 if( base == null ) { |
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256 return Double.valueOf(s); |
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257 } else { |
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258 return Long.valueOf(s,base); |
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259 } |
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260 } catch(NumberFormatException e) {} |
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261 return null; |
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262 } |
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263 |
456 | 264 public static boolean matches(String s,String pattern) { |
265 return s.matches(pattern); | |
266 } | |
267 | |
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268 } |