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annotate core/src/luan/modules/StringLuan.java @ 197:4c96cb73dd93

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fix metatable cloning git-svn-id: https://luan-java.googlecode.com/svn/trunk@198 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Thu, 03 Jul 2014 18:36:46 +0000
parents be0275bda373
children 75750ceb45ee
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
167
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diff changeset
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.MetatableGetter;
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13 import luan.DeepCloner;
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14
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15
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16 public final class StringLuan {
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17
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18 public static final LuanFunction LOADER = new LuanFunction() {
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19 @Override public Object call(LuanState luan,Object[] args) {
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20 LuanTable module = new LuanTable();
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21 MyMetatableGetter mmg = new MyMetatableGetter();
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22 mmg.init(module);
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23 module.put( MetatableGetter.KEY, mmg );
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24 try {
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25 add( module, "to_binary", String.class );
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26 add( module, "to_integers", String.class );
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27 add( module, "from_integers", new int[0].getClass() );
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28 add( module, "find", String.class, String.class, Integer.class, Boolean.class );
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29 add( module, "format", String.class, new Object[0].getClass() );
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30 add( module, "gmatch", String.class, String.class );
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31 add( module, "gsub", LuanState.class, String.class, String.class, Object.class, Integer.class );
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32 add( module, "len", String.class );
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33 add( module, "lower", String.class );
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34 add( module, "match", String.class, String.class, Integer.class );
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35 add( module, "rep", String.class, Integer.TYPE, String.class );
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36 add( module, "reverse", String.class );
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37 add( module, "sub", String.class, Integer.TYPE, Integer.class );
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38 add( module, "upper", String.class );
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39 } catch(NoSuchMethodException e) {
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40 throw new RuntimeException(e);
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41 }
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42 return module;
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43 }
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44 };
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45
48
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46 private static void add(LuanTable t,String method,Class<?>... parameterTypes) throws NoSuchMethodException {
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47 t.put( method, new LuanJavaFunction(StringLuan.class.getMethod(method,parameterTypes),null) );
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48 }
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49
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50 public static class MyMetatableGetter implements MetatableGetter {
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51 private LuanTable module;
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52 private LuanTable metatable;
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53
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54 private MyMetatableGetter() {}
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55
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56 private void init(LuanTable module) {
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57 this.module = module;
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58 this.metatable = new LuanTable();
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59 try {
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60 metatable.put( "__index", new LuanJavaFunction(
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61 MyMetatableGetter.class.getMethod( "__index", LuanState.class, String.class, Object.class ), this
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62 ) );
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63 } catch(NoSuchMethodException e) {
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64 throw new RuntimeException(e);
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65 }
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66 }
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67
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68 @Override public MetatableGetter shallowClone() {
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69 return new MyMetatableGetter();
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70 }
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71
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72 @Override public void deepenClone(MetatableGetter c,DeepCloner cloner) {
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73 MyMetatableGetter clone = (MyMetatableGetter)c;
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74 clone.module = cloner.deepClone(module);
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75 clone.metatable = cloner.deepClone(metatable);
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76 }
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77
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78 @Override public LuanTable getMetatable(Object obj) {
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79 return obj instanceof String ? metatable : null;
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80 }
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81
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82 public Object __index(LuanState luan,final String s,Object key) throws LuanException {
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83 Object obj = module.get(key);
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84 if( obj instanceof LuanFunction ) {
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85 final LuanFunction fn = (LuanFunction)obj;
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86 return new LuanFunction() {
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87 @Override public Object call(LuanState luan,Object[] args) throws LuanException {
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88 Object[] a = new Object[args.length+1];
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89 a[0] = s;
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90 System.arraycopy(args,0,a,1,args.length);
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91 return fn.call(luan,a);
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92 }
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93 };
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94 }
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95 LuanTable mt = luan.getMetatable(s,this);
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96 if( mt == null )
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97 return null;
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98 Object h = mt.get("__index");
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99 if( !(h instanceof LuanFunction) )
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100 return null;
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101 LuanFunction fn = (LuanFunction)h;
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102 return luan.call(fn,new Object[]{s,key});
119
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103 }
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104 }
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105
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106 static int start(String s,int i) {
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107 return i==0 ? 0 : i > 0 ? i - 1 : s.length() + i;
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108 }
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109
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110 static int start(String s,Integer i,int dflt) {
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111 return i==null ? dflt : start(s,i);
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112 }
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113
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114 static int end(String s,int i) {
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115 return i==0 ? 0 : i > 0 ? i : s.length() + i + 1;
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116 }
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117
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118 static int end(String s,Integer i,int dflt) {
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119 return i==null ? dflt : end(s,i);
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120 }
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121
113
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122 public static byte[] to_binary(String s) {
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123 return s.getBytes();
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124 }
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125
113
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126 public static int[] to_integers(String s) {
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127 char[] a = s.toCharArray();
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128 int[] chars = new int[a.length];
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129 for( int i=0; i<a.length; i++ ) {
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130 chars[i] = a[i];
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131 }
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132 return chars;
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133 }
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134
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135 public static String from_integers(int... chars) {
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136 char[] a = new char[chars.length];
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137 for( int i=0; i<chars.length; i++ ) {
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138 a[i] = (char)chars[i];
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139 }
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140 return new String(a);
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141 }
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142
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143 public static int len(String s) {
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144 return s.length();
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145 }
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146
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147 public static String lower(String s) {
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148 return s.toLowerCase();
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149 }
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150
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151 public static String upper(String s) {
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152 return s.toUpperCase();
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153 }
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154
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155 public static String reverse(String s) {
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156 return new StringBuilder(s).reverse().toString();
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157 }
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158
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159 public static String rep(String s,int n,String sep) {
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160 if( n < 1 )
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161 return "";
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162 StringBuilder buf = new StringBuilder(s);
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163 while( --n > 0 ) {
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164 if( sep != null )
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165 buf.append(sep);
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166 buf.append(s);
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167 }
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168 return buf.toString();
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169 }
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170
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171 public static String sub(String s,int i,Integer j) {
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172 int start = start(s,i);
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173 int end = end(s,j,s.length());
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174 return s.substring(start,end);
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175 }
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176
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177 public static int[] find(String s,String pattern,Integer init,Boolean plain) {
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178 int start = start(s,init,0);
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179 if( Boolean.TRUE.equals(plain) ) {
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180 int i = s.indexOf(pattern,start);
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181 return i == -1 ? null : new int[]{i+1,i+pattern.length()};
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182 }
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183 Matcher m = Pattern.compile(pattern).matcher(s);
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184 return m.find(start) ? new int[]{m.start()+1,m.end()} : null;
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185 }
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186
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187 public static String[] match(String s,String pattern,Integer init) {
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188 int start = start(s,init,0);
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189 Matcher m = Pattern.compile(pattern).matcher(s);
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190 if( !m.find(start) )
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191 return null;
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192 final int n = m.groupCount();
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193 if( n == 0 )
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194 return new String[]{m.group()};
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195 String[] rtn = new String[n];
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196 for( int i=0; i<n; i++ ) {
161
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197 rtn[i] = m.group(i+1);
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198 }
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199 return rtn;
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200 }
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201
48
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202 public static LuanFunction gmatch(String s,String pattern) {
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203 final Matcher m = Pattern.compile(pattern).matcher(s);
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204 return new LuanFunction() {
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205 @Override public Object call(LuanState luan,Object[] args) {
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206 if( !m.find() )
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207 return null;
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208 final int n = m.groupCount();
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209 if( n == 0 )
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210 return m.group();
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211 String[] rtn = new String[n];
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212 for( int i=0; i<n; i++ ) {
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213 rtn[i] = m.group(i+1);
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214 }
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215 return rtn;
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216 }
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217 };
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218 }
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219
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220 public static Object[] gsub(LuanState luan,String s,String pattern,Object repl,Integer n) throws LuanException {
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221 int max = n==null ? Integer.MAX_VALUE : n;
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222 final Matcher m = Pattern.compile(pattern).matcher(s);
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223 if( repl instanceof String ) {
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224 String replacement = (String)repl;
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225 int i = 0;
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226 StringBuffer sb = new StringBuffer();
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227 while( i<max && m.find() ) {
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228 m.appendReplacement(sb,replacement);
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229 i++;
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230 }
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231 m.appendTail(sb);
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232 return new Object[]{ sb.toString(), i };
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233 }
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234 if( repl instanceof LuanTable ) {
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235 LuanTable t = (LuanTable)repl;
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236 int i = 0;
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237 StringBuffer sb = new StringBuffer();
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238 while( i<max && m.find() ) {
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239 String match = m.groupCount()==0 ? m.group() : m.group(1);
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240 Object val = t.get(match);
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241 if( Luan.toBoolean(val) ) {
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242 String replacement = Luan.asString(val);
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243 if( replacement==null )
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244 throw luan.exception( "invalid replacement value (a "+Luan.type(val)+")" );
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245 m.appendReplacement(sb,replacement);
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246 }
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247 i++;
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248 }
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249 m.appendTail(sb);
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250 return new Object[]{ sb.toString(), i };
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251 }
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252 if( repl instanceof LuanFunction ) {
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253 LuanFunction fn = (LuanFunction)repl;
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254 int i = 0;
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255 StringBuffer sb = new StringBuffer();
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256 while( i<max && m.find() ) {
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257 Object[] args;
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258 final int count = m.groupCount();
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259 if( count == 0 ) {
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260 args = new Object[]{m.group()};
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261 } else {
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262 args = new Object[count];
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263 for( int j=0; j<count; j++ ) {
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264 args[j] = m.group(j);
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265 }
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266 }
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267 Object val = Luan.first( luan.call(fn,"repl-arg",args) );
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268 if( Luan.toBoolean(val) ) {
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269 String replacement = Luan.asString(val);
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270 if( replacement==null )
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271 throw luan.exception( "invalid replacement value (a "+Luan.type(val)+")" );
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272 m.appendReplacement(sb,replacement);
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273 }
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274 i++;
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275 }
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276 m.appendTail(sb);
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277 return new Object[]{ sb.toString(), i };
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278 }
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279 throw luan.exception( "bad argument #3 to 'gsub' (string/function/table expected)" );
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280 }
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281
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282 // note - String.format() is too stupid to convert between ints and floats.
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283 public static String format(String format,Object... args) {
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284 return String.format(format,args);
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285 }
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286
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287 }