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annotate src/luan/lib/BasicLib.java @ 27:9de9be530625

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minor git-svn-id: https://luan-java.googlecode.com/svn/trunk@28 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Thu, 06 Dec 2012 20:12:43 +0000
parents c93d8c781853
children 9bc66d09ea48
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1 package luan.lib;
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2
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3 import java.io.FileReader;
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4 import java.io.IOException;
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5 import java.lang.reflect.Method;
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6 import java.util.Iterator;
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7 import java.util.Map;
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8 import org.parboiled.Parboiled;
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9 import org.parboiled.errors.ErrorUtils;
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10 import org.parboiled.parserunners.ReportingParseRunner;
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11 import org.parboiled.parserunners.TracingParseRunner;
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12 import org.parboiled.support.ParsingResult;
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13 import luan.Lua;
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14 import luan.LuaState;
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15 import luan.LuaTable;
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16 import luan.LuaNumber;
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17 import luan.LuaFunction;
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18 import luan.LuaJavaFunction;
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19 import luan.LuaException;
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20 import luan.interp.LuaParser;
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21 import luan.interp.Expressions;
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22 import luan.interp.Chunk;
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25 public class BasicLib {
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27 public static void register(LuaState lua) {
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28 LuaTable t = lua.env();
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29 add( t, "print", new Object[0].getClass() );
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30 add( t, "type", Object.class );
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31 add( t, "load", LuaState.class, String.class );
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32 add( t, "loadFile", LuaState.class, String.class );
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33 add( t, "pairs", LuaTable.class );
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34 add( t, "ipairs", LuaTable.class );
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35 }
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37 private static void add(LuaTable t,String method,Class<?>... parameterTypes) {
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38 try {
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39 t.set( method, new LuaJavaFunction(BasicLib.class.getMethod(method,parameterTypes),null) );
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40 } catch(NoSuchMethodException e) {
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41 throw new RuntimeException(e);
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42 }
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43 }
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45 public static void print(Object... args) {
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46 for( int i=0; i<args.length; i++ ) {
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47 if( i > 0 )
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48 System.out.print('\t');
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49 System.out.print( Lua.toString(args[i]) );
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50 }
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51 System.out.println();
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52 }
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54 public static String type(Object obj) {
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55 return Lua.type(obj);
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56 }
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58 public static LuaFunction load(LuaState lua,String ld) throws LuaException {
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59 LuaParser parser = Parboiled.createParser(LuaParser.class);
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60 ParsingResult<?> result = new ReportingParseRunner(parser.Target()).run(ld);
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61 // ParsingResult<?> result = new TracingParseRunner(parser.Target()).run(ld);
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62 if( result.hasErrors() )
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63 throw new LuaException( ErrorUtils.printParseErrors(result) );
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64 Object resultValue = result.resultValue;
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65 if( resultValue instanceof Expressions ) {
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66 final Expressions expressions = (Expressions)resultValue;
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67 return new LuaFunction() {
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68 public Object[] call(LuaState lua,Object... args) throws LuaException {
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69 return expressions.eval(lua);
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70 }
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71 };
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72 }
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73 Chunk chunk = (Chunk)resultValue;
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74 return chunk.newClosure(lua);
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75 }
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77 public static String readFile(String fileName) throws IOException {
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78 StringBuilder sb = new StringBuilder();
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79 FileReader in = new FileReader(fileName);
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80 char[] buf = new char[8192];
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81 int n;
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82 while( (n=in.read(buf)) != -1 ) {
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83 sb.append(buf,0,n);
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84 }
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85 return sb.toString();
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86 }
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87
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88 public static LuaFunction loadFile(LuaState lua,String fileName) throws LuaException,IOException {
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89 return load(lua,readFile(fileName));
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90 }
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91
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92 private static class TableIter {
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93 private final Iterator<Map.Entry<Object,Object>> iter;
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95 TableIter(LuaTable t) {
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96 this.iter = t.iterator();
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97 }
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99 public Object[] next() {
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100 if( !iter.hasNext() )
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101 return LuaFunction.EMPTY_RTN;
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102 Map.Entry<Object,Object> entry = iter.next();
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103 return new Object[]{entry.getKey(),entry.getValue()};
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104 }
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105 }
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106
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107 public static LuaFunction pairs(LuaTable t) {
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108 try {
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109 TableIter ti = new TableIter(t);
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110 Method m = TableIter.class.getMethod("next");
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111 m.setAccessible(true);
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112 return new LuaJavaFunction(m,ti);
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113 } catch(NoSuchMethodException e) {
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114 throw new RuntimeException(e);
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115 }
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116 }
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117
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118 private static class ArrayIter {
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119 private final LuaTable t;
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120 private double i = 0.0;
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121
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122 ArrayIter(LuaTable t) {
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123 this.t = t;
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124 }
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125
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126 public Object[] next() {
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127 LuaNumber n = new LuaNumber(++i);
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128 Object val = t.get(n);
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129 return val==null ? LuaFunction.EMPTY_RTN : new Object[]{n,val};
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130 }
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131 }
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132
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133 public static LuaFunction ipairs(LuaTable t) {
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134 try {
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135 ArrayIter ai = new ArrayIter(t);
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136 Method m = ArrayIter.class.getMethod("next");
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137 m.setAccessible(true);
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138 return new LuaJavaFunction(m,ai);
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139 } catch(NoSuchMethodException e) {
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140 throw new RuntimeException(e);
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141 }
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142 }
2
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143 }