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annotate core/src/luan/modules/StringLuan.java @ 576:4723d22062ce

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remove LuanBit
author Franklin Schmidt <fschmidt@gmail.com>
date Mon, 13 Jul 2015 20:38:26 -0600
parents 7c3ad6db8ac3
children 60c549d43988
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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;
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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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14
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15 public final class StringLuan {
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17 static int start(String s,int i) {
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18 int len = s.length();
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19 return i==0 ? 0 : i > 0 ? Math.min(i-1,len) : Math.max(len+i,0);
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20 }
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22 static int start(String s,Integer i,int dflt) {
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23 return i==null ? dflt : start(s,i);
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24 }
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26 static int end(String s,int i) {
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27 int len = s.length();
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28 return i==0 ? 0 : i > 0 ? Math.min(i,len) : Math.max(len+i+1,0);
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29 }
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31 static int end(String s,Integer i,int dflt) {
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32 return i==null ? dflt : end(s,i);
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33 }
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34
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35 @LuanMethod public static Integer[] unicode(LuanState luan,String s,Integer i,Integer j) throws LuanException {
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36 Utils.checkNotNull(luan,s);
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37 int start = start(s,i,1);
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38 int end = end(s,j,start+1);
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39 Integer[] chars = new Integer[end-start];
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40 for( int k=0; k<chars.length; k++ ) {
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41 chars[k] = (int)s.charAt(start+k);
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42 }
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43 return chars;
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44 }
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46 public static String char_(int... chars) {
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47 char[] a = new char[chars.length];
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48 for( int i=0; i<chars.length; i++ ) {
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49 a[i] = (char)chars[i];
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50 }
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51 return new String(a);
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52 }
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53
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54 @LuanMethod public static byte[] to_binary(String s) {
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55 return s.getBytes();
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56 }
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58 public static String lower(LuanState luan,String s) throws LuanException {
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59 Utils.checkNotNull(luan,s);
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60 return s.toLowerCase();
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61 }
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63 public static String upper(LuanState luan,String s) throws LuanException {
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64 Utils.checkNotNull(luan,s);
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65 return s.toUpperCase();
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66 }
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67
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68 public static String trim(LuanState luan,String s) throws LuanException {
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69 Utils.checkNotNull(luan,s);
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70 return s.trim();
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71 }
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73 public static String reverse(LuanState luan,String s) throws LuanException {
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74 Utils.checkNotNull(luan,s);
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75 return new StringBuilder(s).reverse().toString();
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76 }
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78 public static String rep(String s,int n,String sep) {
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79 if( n < 1 )
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80 return "";
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81 StringBuilder buf = new StringBuilder(s);
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82 while( --n > 0 ) {
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83 if( sep != null )
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84 buf.append(sep);
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85 buf.append(s);
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86 }
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87 return buf.toString();
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88 }
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89
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90 public static String sub(LuanState luan,String s,int i,Integer j) throws LuanException {
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91 Utils.checkNotNull(luan,s);
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92 int start = start(s,i);
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93 int end = end(s,j,s.length());
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94 return s.substring(start,end);
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95 }
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96
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97 @LuanMethod public static Object[] find(String s,String pattern,Integer init,Boolean plain) {
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98 int start = start(s,init,0);
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99 if( Boolean.TRUE.equals(plain) ) {
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100 int i = s.indexOf(pattern,start);
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101 return i == -1 ? null : new Integer[]{i+1,i+pattern.length()};
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102 }
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103 Matcher m = Pattern.compile(pattern).matcher(s);
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104 if( !m.find(start) )
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105 return null;
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106 int n = m.groupCount();
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107 Object[] rtn = new Object[2+n];
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108 rtn[0] = m.start() + 1;
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109 rtn[1] = m.end();
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110 for( int i=0; i<n; i++ ) {
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111 rtn[2+i] = m.group(i+1);
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112 }
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113 return rtn;
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114 }
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115
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116 @LuanMethod public static String[] match(String s,String pattern,Integer init) {
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117 int start = start(s,init,0);
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118 Matcher m = Pattern.compile(pattern).matcher(s);
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119 if( !m.find(start) )
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120 return null;
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121 int n = m.groupCount();
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122 if( n == 0 )
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123 return new String[]{m.group()};
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124 String[] rtn = new String[n];
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125 for( int i=0; i<n; i++ ) {
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126 rtn[i] = m.group(i+1);
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127 }
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128 return rtn;
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129 }
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130
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131 public static LuanFunction gmatch(LuanState luan,String s,String pattern) throws LuanException {
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132 Utils.checkNotNull(luan,s);
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133 final Matcher m = Pattern.compile(pattern).matcher(s);
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134 return new LuanFunction() {
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135 @Override public Object call(LuanState luan,Object[] args) {
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136 if( !m.find() )
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137 return null;
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138 final int n = m.groupCount();
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139 if( n == 0 )
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140 return m.group();
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141 String[] rtn = new String[n];
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142 for( int i=0; i<n; i++ ) {
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143 rtn[i] = m.group(i+1);
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144 }
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145 return rtn;
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146 }
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147 };
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148 }
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149
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150 @LuanMethod public static Object[] gsub(LuanState luan,String s,String pattern,Object repl,Integer n) throws LuanException {
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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.toString(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.toString(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 }
130
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205 throw luan.exception( "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
289
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213 public static String concat(LuanState luan,Object... args) throws LuanException {
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214 StringBuilder sb = new StringBuilder();
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215 for( Object arg : args ) {
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216 sb.append( luan.toString(arg) );
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217 }
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218 return sb.toString();
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219 }
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220
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221 public static String encode(String s) {
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222 return Luan.stringEncode(s);
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223 }
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224
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225 public static Number to_number(LuanState luan,String s,Integer base) throws LuanException {
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226 Utils.checkNotNull(luan,s);
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227 try {
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228 if( base == null ) {
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229 return Double.valueOf(s);
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230 } else {
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231 return Long.valueOf(s,base);
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232 }
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233 } catch(NumberFormatException e) {}
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234 return null;
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235 }
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236
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237 public static boolean matches(String s,String pattern) {
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238 return s.matches(pattern);
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239 }
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240
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241 }