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annotate src/luan/lib/BasicLib.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
parents 786699c78837
children 57054fa43189
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1 package luan.lib;
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3 import java.io.File;
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4 import java.io.Reader;
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5 import java.io.FileReader;
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6 import java.io.InputStreamReader;
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7 import java.io.IOException;
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8 import java.lang.reflect.Method;
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9 import java.util.Iterator;
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10 import java.util.Map;
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11 import luan.Lua;
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12 import luan.LuaState;
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13 import luan.LuaTable;
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14 import luan.LuaNumber;
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15 import luan.LuaFunction;
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16 import luan.LuaJavaFunction;
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17 import luan.LuaException;
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18 import luan.LuaSource;
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19 import luan.LuaElement;
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20 import luan.interp.LuaCompiler;
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23 public final class BasicLib {
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25 public static void register(LuaState lua) {
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26 LuaTable global = lua.global();
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27 global.put( "_G", global );
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28 add( global, "do_file", LuaState.class, String.class );
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29 add( global, "error", LuaState.class, Object.class );
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30 add( global, "get_metatable", LuaState.class, Object.class );
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31 add( global, "ipairs", LuaTable.class );
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32 add( global, "load", LuaState.class, String.class, String.class );
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33 add( global, "load_file", LuaState.class, String.class );
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34 add( global, "pairs", LuaTable.class );
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35 add( global, "print", LuaState.class, new Object[0].getClass() );
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36 add( global, "raw_equal", Object.class, Object.class );
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37 add( global, "raw_get", LuaTable.class, Object.class );
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38 add( global, "raw_len", LuaState.class, Object.class );
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39 add( global, "raw_set", LuaTable.class, Object.class, Object.class );
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40 add( global, "set_metatable", LuaTable.class, LuaTable.class );
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41 add( global, "to_number", Object.class, Integer.class );
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42 add( global, "to_string", LuaState.class, Object.class );
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43 add( global, "type", Object.class );
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44 global.put( "_VERSION", Lua.version );
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45
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46 add( global, "make_standard", LuaState.class );
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47 }
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49 private static void add(LuaTable t,String method,Class<?>... parameterTypes) {
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50 try {
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51 t.put( method, new LuaJavaFunction(BasicLib.class.getMethod(method,parameterTypes),null) );
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52 } catch(NoSuchMethodException e) {
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53 throw new RuntimeException(e);
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54 }
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55 }
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57 public static void make_standard(LuaState lua) {
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58 LuaTable global = lua.global();
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59 global.put( "dofile", global.get("do_file") );
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60 global.put( "getmetatable", global.get("get_metatable") );
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61 global.put( "loadfile", global.get("load_file") );
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62 global.put( "rawequal", global.get("raw_equal") );
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63 global.put( "rawget", global.get("raw_get") );
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64 global.put( "rawlen", global.get("raw_len") );
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65 global.put( "rawset", global.get("raw_set") );
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66 global.put( "setmetatable", global.get("set_metatable") );
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67 global.put( "tonumber", global.get("to_number") );
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68 global.put( "tostring", global.get("to_string") );
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69 }
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70
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71 public static void print(LuaState lua,Object... args) throws LuaException {
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72 for( int i=0; i<args.length; i++ ) {
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73 if( i > 0 )
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74 System.out.print('\t');
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75 System.out.print( lua.toString(LuaElement.JAVA,args[i]) );
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76 }
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77 System.out.println();
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78 }
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79
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80 public static String type(Object obj) {
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81 return Lua.type(obj);
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82 }
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83
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84 public static LuaFunction load(LuaState lua,String text,String sourceName) throws LuaException {
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85 return LuaCompiler.compile(lua,new LuaSource(sourceName,text));
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86 }
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87
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88 public static String readAll(Reader in)
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89 throws IOException
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90 {
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91 char[] a = new char[8192];
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92 StringBuilder buf = new StringBuilder();
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93 int n;
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94 while( (n=in.read(a)) != -1 ) {
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95 buf.append(a,0,n);
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96 }
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97 return buf.toString();
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98 }
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99
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100 public static String read(File file)
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101 throws IOException
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102 {
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103 Reader in = new FileReader(file);
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104 String s = readAll(in);
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105 in.close();
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106 return s;
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107 }
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108
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109
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110 public static LuaFunction load_file(LuaState lua,String fileName) throws LuaException {
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111 try {
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112 String src = fileName==null ? readAll(new InputStreamReader(System.in)) : read(new File(fileName));
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113 return load(lua,src,fileName);
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114 } catch(IOException e) {
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115 throw new LuaException(lua,LuaElement.JAVA,e);
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116 }
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117 }
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118
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119 public static Object[] do_file(LuaState lua,String fileName) throws LuaException {
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120 LuaFunction fn = load_file(lua,fileName);
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121 return lua.call(fn,LuaElement.JAVA,null);
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122 }
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123
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124 public static LuaFunction pairs(LuaTable t) {
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125 final Iterator<Map.Entry<Object,Object>> iter = t.iterator();
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126 return new LuaFunction() {
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127 public Object[] call(LuaState lua,Object[] args) {
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128 if( !iter.hasNext() )
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129 return LuaFunction.EMPTY_RTN;
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130 Map.Entry<Object,Object> entry = iter.next();
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131 return new Object[]{entry.getKey(),entry.getValue()};
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132 }
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133 };
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134 }
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135
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136 public static LuaFunction ipairs(final LuaTable t) {
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137 return new LuaFunction() {
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138 private double i = 0.0;
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139 public Object[] call(LuaState lua,Object[] args) {
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140 LuaNumber n = new LuaNumber(++i);
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141 Object val = t.get(n);
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142 return val==null ? LuaFunction.EMPTY_RTN : new Object[]{n,val};
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143 }
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144 };
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145 }
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146
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147 public static LuaTable get_metatable(LuaState lua,Object obj) {
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148 return lua.getMetatable(obj);
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149 }
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150
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151 public static LuaTable set_metatable(LuaTable table,LuaTable metatable) {
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152 table.setMetatable(metatable);
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153 return table;
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154 }
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155
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156 public static boolean raw_equal(Object v1,Object v2) {
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157 return v1 == v2 || v1 != null && v1.equals(v2);
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158 }
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159
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160 public static Object raw_get(LuaTable table,Object index) {
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161 return table.get(index);
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162 }
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163
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164 public static LuaTable raw_set(LuaTable table,Object index,Object value) {
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165 table.put(index,value);
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166 return table;
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167 }
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168
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169 public static int raw_len(LuaState lua,Object v) throws LuaException {
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170 if( v instanceof String ) {
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171 String s = (String)v;
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172 return s.length();
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173 }
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174 if( v instanceof LuaTable ) {
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175 LuaTable t = (LuaTable)v;
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176 return t.length();
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177 }
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178 throw new LuaException( lua, LuaElement.JAVA, "bad argument #1 to 'raw_len' (table or string expected)" );
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179 }
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180
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181 public static LuaNumber to_number(Object e,Integer base) {
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182 return Lua.toNumber(e,base);
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183 }
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184
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185 public static String to_string(LuaState lua,Object v) throws LuaException {
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186 return lua.toString(LuaElement.JAVA,v);
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187 }
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188
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189 public static void error(LuaState lua,Object msg) throws LuaException {
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190 throw new LuaException(lua,LuaElement.JAVA,msg);
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191 }
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192
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193 }