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annotate src/luan/lib/StringLib.java @ 73:f86e4f77ef32

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add package module git-svn-id: https://luan-java.googlecode.com/svn/trunk@74 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Tue, 12 Feb 2013 09:46:45 +0000
parents 8ede219cd111
children f003338d503b
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1 package luan.lib;
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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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14 public final class StringLib {
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16 public static final String NAME = "string";
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18 public static final LuanFunction LOADER = new LuanFunction() {
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19 public Object[] call(LuanState luan,Object[] args) throws LuanException {
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20 LuanTable module = new LuanTable();
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21 LuanTable global = luan.global;
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22 global.put(NAME,module);
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23 try {
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24 module.put( "byte", new LuanJavaFunction(StringLib.class.getMethod("byte_",String.class,Integer.class,Integer.class),null) );
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25 module.put( "char", new LuanJavaFunction(StringLib.class.getMethod("char_",new byte[0].getClass()),null) );
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26 add( module, "find", String.class, String.class, Integer.class, Boolean.class );
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27 add( module, "gmatch", String.class, String.class );
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28 add( module, "gsub", LuanState.class, String.class, String.class, Object.class, Integer.class );
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29 add( module, "len", String.class );
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30 add( module, "lower", String.class );
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31 add( module, "match", String.class, String.class, Integer.class );
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32 add( module, "rep", String.class, Integer.TYPE, String.class );
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33 add( module, "reverse", String.class );
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34 add( module, "sub", String.class, Integer.TYPE, Integer.class );
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35 add( module, "upper", String.class );
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36 } catch(NoSuchMethodException e) {
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37 throw new RuntimeException(e);
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38 }
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39 return LuanFunction.EMPTY_RTN;
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40 }
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41 };
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42
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43 private static void add(LuanTable t,String method,Class<?>... parameterTypes) throws NoSuchMethodException {
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44 t.put( method, new LuanJavaFunction(StringLib.class.getMethod(method,parameterTypes),null) );
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45 }
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47 static int start(String s,int i) {
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48 return i==0 ? 0 : i > 0 ? i - 1 : s.length() + i;
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49 }
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51 static int start(String s,Integer i,int dflt) {
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52 return i==null ? dflt : start(s,i);
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53 }
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55 static int end(String s,int i) {
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56 return i==0 ? 0 : i > 0 ? i : s.length() + i + 1;
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57 }
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59 static int end(String s,Integer i,int dflt) {
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60 return i==null ? dflt : end(s,i);
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61 }
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63 public static byte[] byte_(String s,Integer i,Integer j) {
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64 int start = start(s,i,0);
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65 int end = end(s,j,start+1);
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66 return s.substring(start,end).getBytes();
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67 }
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69 public static String char_(byte... bytes) {
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70 return new String(bytes);
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71 }
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73 // format is hard because String.format() is too stupid to convert ints to floats.
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75 public static int len(String s) {
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76 return s.length();
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77 }
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78
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79 public static String lower(String s) {
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80 return s.toLowerCase();
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81 }
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82
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83 public static String upper(String s) {
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84 return s.toUpperCase();
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85 }
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86
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87 public static String reverse(String s) {
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88 return new StringBuilder(s).reverse().toString();
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89 }
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91 public static String rep(String s,int n,String sep) {
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92 if( n < 1 )
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93 return "";
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94 StringBuilder buf = new StringBuilder(s);
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95 while( --n > 0 ) {
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96 if( sep != null )
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97 buf.append(sep);
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98 buf.append(s);
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99 }
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100 return buf.toString();
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101 }
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102
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103 public static String sub(String s,int i,Integer j) {
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104 int start = start(s,i);
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105 int end = end(s,j,s.length());
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106 return s.substring(start,end);
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107 }
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108
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109 public static int[] find(String s,String pattern,Integer init,Boolean plain) {
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110 int start = start(s,init,0);
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111 if( Boolean.TRUE.equals(plain) ) {
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112 int i = s.indexOf(pattern,start);
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113 return i == -1 ? null : new int[]{i+1,i+pattern.length()};
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114 }
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115 Matcher m = Pattern.compile(pattern).matcher(s);
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116 return m.find(start) ? new int[]{m.start()+1,m.end()} : null;
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117 }
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118
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119 public static String[] match(String s,String pattern,Integer init) {
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120 int start = start(s,init,0);
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121 Matcher m = Pattern.compile(pattern).matcher(s);
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122 if( !m.find(start) )
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123 return null;
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124 final int n = m.groupCount();
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125 if( n == 0 )
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126 return new String[]{m.group()};
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127 String[] rtn = new String[n];
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128 for( int i=0; i<n; i++ ) {
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129 rtn[i] = m.group(i);
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130 }
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131 return rtn;
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132 }
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133
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134 public static LuanFunction gmatch(String s,String pattern) {
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135 final Matcher m = Pattern.compile(pattern).matcher(s);
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136 return new LuanFunction() {
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137 public Object[] call(LuanState luan,Object[] args) {
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138 if( !m.find() )
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139 return LuanFunction.EMPTY_RTN;
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140 final int n = m.groupCount();
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141 if( n == 0 )
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142 return new String[]{m.group()};
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143 String[] rtn = new String[n];
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144 for( int i=0; i<n; i++ ) {
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145 rtn[i] = m.group(i);
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146 }
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147 return rtn;
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148 }
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149 };
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150 }
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151
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152 public static Object[] gsub(LuanState luan,String s,String pattern,Object repl,Integer n) throws LuanException {
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153 int max = n==null ? Integer.MAX_VALUE : n;
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154 final Matcher m = Pattern.compile(pattern).matcher(s);
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155 if( repl instanceof String ) {
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156 String replacement = (String)repl;
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157 int i = 0;
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158 StringBuffer sb = new StringBuffer();
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159 while( i<max && m.find() ) {
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160 m.appendReplacement(sb,replacement);
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161 i++;
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162 }
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163 m.appendTail(sb);
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164 return new Object[]{ sb.toString(), i };
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165 }
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166 if( repl instanceof LuanTable ) {
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167 LuanTable t = (LuanTable)repl;
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168 int i = 0;
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169 StringBuffer sb = new StringBuffer();
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170 while( i<max && m.find() ) {
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171 String match = m.groupCount()==0 ? m.group() : m.group(0);
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172 Object val = t.get(match);
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173 if( Luan.toBoolean(val) ) {
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174 String replacement = Luan.asString(val);
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175 if( replacement==null )
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176 throw new LuanException( luan, LuanElement.JAVA, "invalid replacement value (a "+Luan.type(val)+")" );
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177 m.appendReplacement(sb,replacement);
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178 }
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179 i++;
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180 }
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181 m.appendTail(sb);
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182 return new Object[]{ sb.toString(), i };
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183 }
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184 if( repl instanceof LuanFunction ) {
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185 LuanFunction fn = (LuanFunction)repl;
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186 int i = 0;
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187 StringBuffer sb = new StringBuffer();
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188 while( i<max && m.find() ) {
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189 Object[] args;
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190 final int count = m.groupCount();
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191 if( count == 0 ) {
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192 args = new Object[]{m.group()};
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193 } else {
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194 args = new Object[count];
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195 for( int j=0; j<count; j++ ) {
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196 args[j] = m.group(j);
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197 }
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198 }
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199 Object val = Luan.first( luan.call(fn,LuanElement.JAVA,"repl-arg",args) );
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200 if( Luan.toBoolean(val) ) {
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201 String replacement = Luan.asString(val);
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202 if( replacement==null )
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203 throw new LuanException( luan, LuanElement.JAVA, "invalid replacement value (a "+Luan.type(val)+")" );
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204 m.appendReplacement(sb,replacement);
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205 }
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206 i++;
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207 }
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208 m.appendTail(sb);
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209 return new Object[]{ sb.toString(), i };
43
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210 }
49
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211 throw new LuanException( luan, LuanElement.JAVA, "bad argument #3 to 'gsub' (string/function/table expected)" );
43
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212 }
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213
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214 }