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annotate src/luan/lib/StringLib.java @ 74:f003338d503b

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improve package lib git-svn-id: https://luan-java.googlecode.com/svn/trunk@75 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Wed, 13 Feb 2013 06:27:56 +0000
parents f86e4f77ef32
children 4bf3d0c0b6b9
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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 try {
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23 module.put( "byte", new LuanJavaFunction(StringLib.class.getMethod("byte_",String.class,Integer.class,Integer.class),null) );
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24 module.put( "char", new LuanJavaFunction(StringLib.class.getMethod("char_",new byte[0].getClass()),null) );
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25 add( module, "find", String.class, String.class, Integer.class, Boolean.class );
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26 add( module, "gmatch", String.class, String.class );
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27 add( module, "gsub", LuanState.class, String.class, String.class, Object.class, Integer.class );
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28 add( module, "len", String.class );
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29 add( module, "lower", String.class );
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30 add( module, "match", String.class, String.class, Integer.class );
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31 add( module, "rep", String.class, Integer.TYPE, String.class );
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32 add( module, "reverse", String.class );
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33 add( module, "sub", String.class, Integer.TYPE, Integer.class );
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34 add( module, "upper", String.class );
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35 } catch(NoSuchMethodException e) {
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36 throw new RuntimeException(e);
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37 }
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38 return new Object[]{module};
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39 }
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40 };
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42 private static void add(LuanTable t,String method,Class<?>... parameterTypes) throws NoSuchMethodException {
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43 t.put( method, new LuanJavaFunction(StringLib.class.getMethod(method,parameterTypes),null) );
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44 }
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46 static int start(String s,int i) {
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47 return i==0 ? 0 : i > 0 ? i - 1 : s.length() + i;
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48 }
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50 static int start(String s,Integer i,int dflt) {
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51 return i==null ? dflt : start(s,i);
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52 }
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54 static int end(String s,int i) {
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55 return i==0 ? 0 : i > 0 ? i : s.length() + i + 1;
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56 }
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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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62 public static byte[] byte_(String s,Integer i,Integer j) {
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63 int start = start(s,i,0);
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64 int end = end(s,j,start+1);
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65 return s.substring(start,end).getBytes();
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66 }
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68 public static String char_(byte... bytes) {
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69 return new String(bytes);
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70 }
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72 // format is hard because String.format() is too stupid to convert ints to floats.
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74 public static int len(String s) {
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75 return s.length();
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76 }
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78 public static String lower(String s) {
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79 return s.toLowerCase();
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80 }
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81
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82 public static String upper(String s) {
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83 return s.toUpperCase();
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84 }
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85
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86 public static String reverse(String s) {
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87 return new StringBuilder(s).reverse().toString();
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88 }
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90 public static String rep(String s,int n,String sep) {
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91 if( n < 1 )
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92 return "";
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93 StringBuilder buf = new StringBuilder(s);
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94 while( --n > 0 ) {
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95 if( sep != null )
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96 buf.append(sep);
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97 buf.append(s);
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98 }
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99 return buf.toString();
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100 }
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102 public static String sub(String s,int i,Integer j) {
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103 int start = start(s,i);
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104 int end = end(s,j,s.length());
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105 return s.substring(start,end);
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106 }
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107
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108 public static int[] find(String s,String pattern,Integer init,Boolean plain) {
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109 int start = start(s,init,0);
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110 if( Boolean.TRUE.equals(plain) ) {
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111 int i = s.indexOf(pattern,start);
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112 return i == -1 ? null : new int[]{i+1,i+pattern.length()};
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113 }
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114 Matcher m = Pattern.compile(pattern).matcher(s);
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115 return m.find(start) ? new int[]{m.start()+1,m.end()} : null;
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116 }
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117
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118 public static String[] match(String s,String pattern,Integer init) {
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119 int start = start(s,init,0);
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120 Matcher m = Pattern.compile(pattern).matcher(s);
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121 if( !m.find(start) )
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122 return null;
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123 final int n = m.groupCount();
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124 if( n == 0 )
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125 return new String[]{m.group()};
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126 String[] rtn = new String[n];
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127 for( int i=0; i<n; i++ ) {
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128 rtn[i] = m.group(i);
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129 }
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130 return rtn;
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131 }
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132
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133 public static LuanFunction gmatch(String s,String pattern) {
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134 final Matcher m = Pattern.compile(pattern).matcher(s);
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135 return new LuanFunction() {
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136 public Object[] call(LuanState luan,Object[] args) {
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137 if( !m.find() )
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138 return LuanFunction.EMPTY_RTN;
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139 final int n = m.groupCount();
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140 if( n == 0 )
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141 return new String[]{m.group()};
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142 String[] rtn = new String[n];
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143 for( int i=0; i<n; i++ ) {
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144 rtn[i] = m.group(i);
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145 }
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146 return rtn;
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147 }
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148 };
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149 }
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150
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151 public static Object[] gsub(LuanState luan,String s,String pattern,Object repl,Integer n) throws LuanException {
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152 int max = n==null ? Integer.MAX_VALUE : n;
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153 final Matcher m = Pattern.compile(pattern).matcher(s);
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154 if( repl instanceof String ) {
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155 String replacement = (String)repl;
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156 int i = 0;
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157 StringBuffer sb = new StringBuffer();
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158 while( i<max && m.find() ) {
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159 m.appendReplacement(sb,replacement);
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160 i++;
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161 }
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162 m.appendTail(sb);
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163 return new Object[]{ sb.toString(), i };
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164 }
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165 if( repl instanceof LuanTable ) {
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166 LuanTable t = (LuanTable)repl;
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167 int i = 0;
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168 StringBuffer sb = new StringBuffer();
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169 while( i<max && m.find() ) {
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170 String match = m.groupCount()==0 ? m.group() : m.group(0);
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171 Object val = t.get(match);
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172 if( Luan.toBoolean(val) ) {
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173 String replacement = Luan.asString(val);
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174 if( replacement==null )
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175 throw new LuanException( luan, LuanElement.JAVA, "invalid replacement value (a "+Luan.type(val)+")" );
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176 m.appendReplacement(sb,replacement);
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177 }
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178 i++;
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179 }
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180 m.appendTail(sb);
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181 return new Object[]{ sb.toString(), i };
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182 }
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183 if( repl instanceof LuanFunction ) {
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184 LuanFunction fn = (LuanFunction)repl;
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185 int i = 0;
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186 StringBuffer sb = new StringBuffer();
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187 while( i<max && m.find() ) {
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188 Object[] args;
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189 final int count = m.groupCount();
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190 if( count == 0 ) {
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191 args = new Object[]{m.group()};
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192 } else {
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193 args = new Object[count];
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194 for( int j=0; j<count; j++ ) {
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195 args[j] = m.group(j);
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196 }
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197 }
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198 Object val = Luan.first( luan.call(fn,LuanElement.JAVA,"repl-arg",args) );
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199 if( Luan.toBoolean(val) ) {
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200 String replacement = Luan.asString(val);
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201 if( replacement==null )
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202 throw new LuanException( luan, LuanElement.JAVA, "invalid replacement value (a "+Luan.type(val)+")" );
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203 m.appendReplacement(sb,replacement);
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204 }
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205 i++;
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206 }
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207 m.appendTail(sb);
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208 return new Object[]{ sb.toString(), i };
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209 }
49
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210 throw new LuanException( luan, LuanElement.JAVA, "bad argument #3 to 'gsub' (string/function/table expected)" );
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211 }
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212
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213 }