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annotate core/src/luan/modules/StringLuan.java @ 360:cbb94a7c7a9e

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allow mail attachments; add String.to_binary and Binary.to_string;
author Franklin Schmidt <fschmidt@gmail.com>
date Wed, 15 Apr 2015 11:32:30 -0600
parents 5e7450ac27f2
children d55e873e1f0d
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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.util.regex.Pattern;
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4 import java.util.regex.Matcher;
48
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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
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14
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15 public final class StringLuan {
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17 public static Object __index(LuanState luan,final String s,Object key) throws LuanException {
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18 LuanTable mod = (LuanTable)PackageLuan.loaded(luan).get("luan:String");
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19 if( mod!=null ) {
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20 Object obj = mod.get(key);
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21 if( obj instanceof LuanFunction ) {
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22 final LuanFunction fn = (LuanFunction)obj;
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23 return new LuanFunction() {
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24 @Override public Object call(LuanState luan,Object[] args) throws LuanException {
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25 Object[] a = new Object[args.length+1];
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26 a[0] = s;
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27 System.arraycopy(args,0,a,1,args.length);
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28 return fn.call(luan,a);
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29 }
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30 };
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31 }
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32 }
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33 return null;
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34 }
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35
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36 static int start(String s,int i) {
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37 int len = s.length();
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38 return i==0 ? 0 : i > 0 ? Math.min(i-1,len) : Math.max(len+i,0);
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39 }
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41 static int start(String s,Integer i,int dflt) {
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42 return i==null ? dflt : start(s,i);
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43 }
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44
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45 static int end(String s,int i) {
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46 int len = s.length();
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47 return i==0 ? 0 : i > 0 ? Math.min(i,len) : Math.max(len+i+1,0);
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48 }
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50 static int end(String s,Integer i,int dflt) {
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51 return i==null ? dflt : end(s,i);
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52 }
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53
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54 @LuanMethod public static Integer[] unicode(LuanState luan,String s,Integer i,Integer j) throws LuanException {
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55 Utils.checkNotNull(luan,s);
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56 int start = start(s,i,1);
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57 int end = end(s,j,start+1);
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58 Integer[] chars = new Integer[end-start];
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59 for( int k=0; k<chars.length; k++ ) {
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60 chars[k] = (int)s.charAt(start+k);
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61 }
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62 return chars;
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63 }
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64
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65 public static String char_(int... chars) {
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66 char[] a = new char[chars.length];
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67 for( int i=0; i<chars.length; i++ ) {
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68 a[i] = (char)chars[i];
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69 }
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70 return new String(a);
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71 }
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72
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73 @LuanMethod public static byte[] to_binary(String s) {
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74 return s.getBytes();
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75 }
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76
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77 public static int len(LuanState luan,String s) throws LuanException {
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78 Utils.checkNotNull(luan,s);
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79 return s.length();
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80 }
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81
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82 public static String lower(LuanState luan,String s) throws LuanException {
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83 Utils.checkNotNull(luan,s);
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84 return s.toLowerCase();
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85 }
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86
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87 public static String upper(LuanState luan,String s) throws LuanException {
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88 Utils.checkNotNull(luan,s);
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89 return s.toUpperCase();
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90 }
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92 public static String trim(LuanState luan,String s) throws LuanException {
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93 Utils.checkNotNull(luan,s);
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94 return s.trim();
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95 }
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97 public static String reverse(LuanState luan,String s) throws LuanException {
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98 Utils.checkNotNull(luan,s);
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99 return new StringBuilder(s).reverse().toString();
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100 }
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102 public static String rep(String s,int n,String sep) {
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103 if( n < 1 )
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104 return "";
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105 StringBuilder buf = new StringBuilder(s);
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106 while( --n > 0 ) {
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107 if( sep != null )
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108 buf.append(sep);
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109 buf.append(s);
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110 }
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111 return buf.toString();
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112 }
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113
251
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114 public static String sub(LuanState luan,String s,int i,Integer j) throws LuanException {
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115 Utils.checkNotNull(luan,s);
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116 int start = start(s,i);
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117 int end = end(s,j,s.length());
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118 return s.substring(start,end);
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119 }
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120
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121 public static int[] find(String s,String pattern,Integer init,Boolean plain) {
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122 int start = start(s,init,0);
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123 if( Boolean.TRUE.equals(plain) ) {
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124 int i = s.indexOf(pattern,start);
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125 return i == -1 ? null : new int[]{i+1,i+pattern.length()};
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126 }
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127 Matcher m = Pattern.compile(pattern).matcher(s);
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128 return m.find(start) ? new int[]{m.start()+1,m.end()} : null;
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129 }
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130
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131 @LuanMethod public static String[] match(String s,String pattern,Integer init) {
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132 int start = start(s,init,0);
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133 Matcher m = Pattern.compile(pattern).matcher(s);
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134 if( !m.find(start) )
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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 new String[]{m.group()};
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139 String[] rtn = new String[n];
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140 for( int i=0; i<n; i++ ) {
161
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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
271
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146 public static LuanFunction gmatch(LuanState luan,String s,String pattern) throws LuanException {
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147 Utils.checkNotNull(luan,s);
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148 final Matcher m = Pattern.compile(pattern).matcher(s);
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149 return new LuanFunction() {
112
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150 @Override public Object call(LuanState luan,Object[] args) {
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151 if( !m.find() )
112
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152 return null;
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153 final int n = m.groupCount();
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154 if( n == 0 )
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155 return m.group();
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156 String[] rtn = new String[n];
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157 for( int i=0; i<n; i++ ) {
138
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158 rtn[i] = m.group(i+1);
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159 }
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160 return rtn;
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161 }
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162 };
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163 }
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164
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165 @LuanMethod public static Object[] gsub(LuanState luan,String s,String pattern,Object repl,Integer n) throws LuanException {
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166 int max = n==null ? Integer.MAX_VALUE : n;
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167 final Matcher m = Pattern.compile(pattern).matcher(s);
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168 if( repl instanceof String ) {
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169 String replacement = (String)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 m.appendReplacement(sb,replacement);
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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 LuanTable ) {
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180 LuanTable t = (LuanTable)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 String match = m.groupCount()==0 ? m.group() : m.group(1);
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185 Object val = t.get(match);
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186 if( Luan.toBoolean(val) ) {
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187 String replacement = Luan.asString(val);
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188 if( replacement==null )
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189 throw luan.exception( "invalid replacement value (a "+Luan.type(val)+")" );
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190 m.appendReplacement(sb,replacement);
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191 }
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192 i++;
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193 }
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194 m.appendTail(sb);
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195 return new Object[]{ sb.toString(), i };
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196 }
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197 if( repl instanceof LuanFunction ) {
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198 LuanFunction fn = (LuanFunction)repl;
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199 int i = 0;
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200 StringBuffer sb = new StringBuffer();
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201 while( i<max && m.find() ) {
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202 Object[] args;
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203 final int count = m.groupCount();
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204 if( count == 0 ) {
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205 args = new Object[]{m.group()};
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206 } else {
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207 args = new Object[count];
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208 for( int j=0; j<count; j++ ) {
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209 args[j] = m.group(j);
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210 }
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211 }
130
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212 Object val = Luan.first( luan.call(fn,"repl-arg",args) );
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213 if( Luan.toBoolean(val) ) {
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214 String replacement = Luan.asString(val);
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215 if( replacement==null )
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216 throw luan.exception( "invalid replacement value (a "+Luan.type(val)+")" );
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217 m.appendReplacement(sb,replacement);
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218 }
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219 i++;
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220 }
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221 m.appendTail(sb);
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222 return new Object[]{ sb.toString(), i };
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223 }
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224 throw luan.exception( "bad argument #3 to 'gsub' (string/function/table expected)" );
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225 }
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226
79
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227 // note - String.format() is too stupid to convert between ints and floats.
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228 public static String format(String format,Object... args) {
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229 return String.format(format,args);
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230 }
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231
289
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232 public static String concat(LuanState luan,Object... args) throws LuanException {
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233 StringBuilder sb = new StringBuilder();
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234 for( Object arg : args ) {
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235 sb.append( luan.toString(arg) );
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236 }
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237 return sb.toString();
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238 }
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239
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240 }