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annotate src/luan/lib/StringLib.java @ 43:80b67b1a653c

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implement string lib git-svn-id: https://luan-java.googlecode.com/svn/trunk@44 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Tue, 25 Dec 2012 03:42:42 +0000
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children 57054fa43189
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43
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1 package luan.lib;
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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.Lua;
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6 import luan.LuaState;
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7 import luan.LuaTable;
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8 import luan.LuaFunction;
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9 import luan.LuaJavaFunction;
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10 import luan.LuaNumber;
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11 import luan.LuaElement;
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12 import luan.LuaException;
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14
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15 public final class StringLib {
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17 public static void register(LuaState lua) {
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18 LuaTable module = new LuaTable();
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19 LuaTable global = lua.global();
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20 global.put("string",module);
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21 try {
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22 module.put( "byte", new LuaJavaFunction(StringLib.class.getMethod("byte_",String.class,Integer.class,Integer.class),null) );
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23 module.put( "char", new LuaJavaFunction(StringLib.class.getMethod("char_",new byte[0].getClass()),null) );
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24 add( module, "find", String.class, String.class, Integer.class, Boolean.class );
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25 add( module, "gmatch", String.class, String.class );
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26 add( module, "gsub", LuaState.class, String.class, String.class, Object.class, Integer.class );
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27 add( module, "len", String.class );
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28 add( module, "lower", String.class );
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29 add( module, "match", String.class, String.class, Integer.class );
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30 add( module, "rep", String.class, Integer.TYPE, String.class );
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31 add( module, "reverse", String.class );
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32 add( module, "sub", String.class, Integer.TYPE, Integer.class );
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33 add( module, "upper", String.class );
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34 } catch(NoSuchMethodException e) {
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35 throw new RuntimeException(e);
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36 }
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37 }
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38
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39 private static void add(LuaTable t,String method,Class<?>... parameterTypes) throws NoSuchMethodException {
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40 t.put( method, new LuaJavaFunction(StringLib.class.getMethod(method,parameterTypes),null) );
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41 }
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42
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43 static int start(String s,int i) {
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44 return i==0 ? 0 : i > 0 ? i - 1 : s.length() + i;
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45 }
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46
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47 static int start(String s,Integer i,int dflt) {
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48 return i==null ? dflt : start(s,i);
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49 }
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50
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51 static int end(String s,int i) {
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52 return i==0 ? 0 : i > 0 ? i : s.length() + i + 1;
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53 }
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55 static int end(String s,Integer i,int dflt) {
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56 return i==null ? dflt : end(s,i);
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57 }
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58
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59 public static byte[] byte_(String s,Integer i,Integer j) {
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60 int start = start(s,i,0);
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61 int end = end(s,j,start+1);
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62 return s.substring(start,end).getBytes();
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63 }
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64
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65 public static String char_(byte... bytes) {
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66 return new String(bytes);
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67 }
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69 // format is hard because String.format() is too stupid to convert ints to floats.
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71 public static int len(String s) {
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72 return s.length();
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73 }
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74
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75 public static String lower(String s) {
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76 return s.toLowerCase();
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77 }
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78
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79 public static String upper(String s) {
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80 return s.toUpperCase();
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81 }
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82
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83 public static String reverse(String s) {
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84 return new StringBuilder(s).reverse().toString();
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85 }
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86
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87 public static String rep(String s,int n,String sep) {
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88 if( n < 1 )
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89 return "";
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90 StringBuilder buf = new StringBuilder(s);
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91 while( --n > 0 ) {
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92 if( sep != null )
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93 buf.append(sep);
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94 buf.append(s);
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95 }
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96 return buf.toString();
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97 }
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98
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99 public static String sub(String s,int i,Integer j) {
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100 int start = start(s,i);
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101 int end = end(s,j,s.length());
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102 return s.substring(start,end);
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103 }
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104
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105 public static int[] find(String s,String pattern,Integer init,Boolean plain) {
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106 int start = start(s,init,0);
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107 if( Boolean.TRUE.equals(plain) ) {
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108 int i = s.indexOf(pattern,start);
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109 return i == -1 ? null : new int[]{i+1,i+pattern.length()};
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110 }
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111 Matcher m = Pattern.compile(pattern).matcher(s);
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112 return m.find(start) ? new int[]{m.start()+1,m.end()} : null;
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113 }
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114
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115 public static String[] match(String s,String pattern,Integer init) {
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116 int start = start(s,init,0);
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117 Matcher m = Pattern.compile(pattern).matcher(s);
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118 if( !m.find(start) )
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119 return null;
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120 final int n = m.groupCount();
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121 if( n == 0 )
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122 return new String[]{m.group()};
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123 String[] rtn = new String[n];
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124 for( int i=0; i<n; i++ ) {
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125 rtn[i] = m.group(i);
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126 }
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127 return rtn;
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128 }
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129
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130 public static LuaFunction gmatch(String s,String pattern) {
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131 final Matcher m = Pattern.compile(pattern).matcher(s);
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132 return new LuaFunction() {
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133 public Object[] call(LuaState lua,Object[] args) {
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134 if( !m.find() )
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135 return LuaFunction.EMPTY_RTN;
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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++ ) {
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141 rtn[i] = m.group(i);
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142 }
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143 return rtn;
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144 }
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145 };
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146 }
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147
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148 public static Object[] gsub(LuaState lua,String s,String pattern,Object repl,Integer n) throws LuaException {
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149 int max = n==null ? Integer.MAX_VALUE : n;
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150 final Matcher m = Pattern.compile(pattern).matcher(s);
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151 if( repl instanceof String ) {
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152 String replacement = (String)repl;
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153 int i = 0;
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154 StringBuffer sb = new StringBuffer();
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155 while( i<max && m.find() ) {
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156 m.appendReplacement(sb,replacement);
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157 i++;
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158 }
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159 m.appendTail(sb);
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160 return new Object[]{ sb.toString(), new LuaNumber(i) };
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161 }
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162 if( repl instanceof LuaTable ) {
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163 LuaTable t = (LuaTable)repl;
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164 int i = 0;
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165 StringBuffer sb = new StringBuffer();
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166 while( i<max && m.find() ) {
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167 String match = m.groupCount()==0 ? m.group() : m.group(0);
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168 Object val = t.get(match);
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169 if( Lua.toBoolean(val) ) {
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170 String replacement = Lua.asString(val);
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171 if( replacement==null )
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172 throw new LuaException( lua, LuaElement.JAVA, "invalid replacement value (a "+Lua.type(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(), new LuaNumber(i) };
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179 }
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180 if( repl instanceof LuaFunction ) {
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181 LuaFunction fn = (LuaFunction)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 Object[]{m.group()};
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189 } else {
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190 args = new Object[count];
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191 for( int j=0; j<count; j++ ) {
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192 args[j] = m.group(j);
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193 }
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194 }
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195 Object val = Lua.first( lua.call(fn,LuaElement.JAVA,"repl-arg",args) );
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196 if( Lua.toBoolean(val) ) {
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197 String replacement = Lua.asString(val);
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198 if( replacement==null )
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199 throw new LuaException( lua, LuaElement.JAVA, "invalid replacement value (a "+Lua.type(val)+")" );
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200 m.appendReplacement(sb,replacement);
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201 }
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202 i++;
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203 }
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204 m.appendTail(sb);
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205 return new Object[]{ sb.toString(), new LuaNumber(i) };
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206 }
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207 throw new LuaException( lua, LuaElement.JAVA, "bad argument #3 to 'gsub' (string/function/table expected)" );
80b67b1a653c implement string lib
fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents:
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208 }
80b67b1a653c implement string lib
fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents:
diff changeset
209
80b67b1a653c implement string lib
fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
parents:
diff changeset
210 }