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annotate src/luan/lib/BasicLib.java @ 29:9bc66d09ea48

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CmdLine improvements git-svn-id: https://luan-java.googlecode.com/svn/trunk@30 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Fri, 07 Dec 2012 09:33:31 +0000
parents 9de9be530625
children 8d8f4f5caef4
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1 package luan.lib;
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2
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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.IOException;
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7 import java.lang.reflect.Method;
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8 import java.util.Iterator;
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9 import java.util.Map;
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10 import org.parboiled.Parboiled;
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11 import org.parboiled.errors.ErrorUtils;
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12 import org.parboiled.parserunners.ReportingParseRunner;
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13 import org.parboiled.parserunners.TracingParseRunner;
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14 import org.parboiled.support.ParsingResult;
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15 import luan.Lua;
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16 import luan.LuaState;
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17 import luan.LuaTable;
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18 import luan.LuaNumber;
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19 import luan.LuaFunction;
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20 import luan.LuaJavaFunction;
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21 import luan.LuaException;
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22 import luan.interp.LuaParser;
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23 import luan.interp.Expressions;
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24 import luan.interp.Chunk;
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27 public class BasicLib {
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29 public static void register(LuaState lua) {
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30 LuaTable t = lua.env();
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31 add( t, "print", new Object[0].getClass() );
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32 add( t, "type", Object.class );
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33 add( t, "load", LuaState.class, String.class );
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34 add( t, "loadfile", LuaState.class, String.class );
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35 add( t, "pairs", LuaTable.class );
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36 add( t, "ipairs", LuaTable.class );
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37 }
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39 private static void add(LuaTable t,String method,Class<?>... parameterTypes) {
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40 try {
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41 t.set( method, new LuaJavaFunction(BasicLib.class.getMethod(method,parameterTypes),null) );
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42 } catch(NoSuchMethodException e) {
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43 throw new RuntimeException(e);
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44 }
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45 }
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47 public static void print(Object... args) {
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48 for( int i=0; i<args.length; i++ ) {
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49 if( i > 0 )
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50 System.out.print('\t');
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51 System.out.print( Lua.toString(args[i]) );
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52 }
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53 System.out.println();
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54 }
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55
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56 public static String type(Object obj) {
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57 return Lua.type(obj);
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58 }
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59
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60 public static LuaFunction load(LuaState lua,String ld) throws LuaException {
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61 LuaParser parser = Parboiled.createParser(LuaParser.class);
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62 ParsingResult<?> result = new ReportingParseRunner(parser.Target()).run(ld);
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63 // ParsingResult<?> result = new TracingParseRunner(parser.Target()).run(ld);
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64 if( result.hasErrors() )
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65 throw new LuaException( ErrorUtils.printParseErrors(result) );
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66 Object resultValue = result.resultValue;
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67 if( resultValue instanceof Expressions ) {
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68 final Expressions expressions = (Expressions)resultValue;
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69 return new LuaFunction() {
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70 public Object[] call(LuaState lua,Object... args) throws LuaException {
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71 return expressions.eval(lua);
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72 }
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73 };
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74 }
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75 Chunk chunk = (Chunk)resultValue;
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76 return chunk.newClosure(lua);
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77 }
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78
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79 public static String readAll(Reader in)
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80 throws IOException
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81 {
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82 char[] a = new char[8192];
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83 StringBuilder buf = new StringBuilder();
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84 int n;
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85 while( (n=in.read(a)) != -1 ) {
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86 buf.append(a,0,n);
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87 }
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88 return buf.toString();
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89 }
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90
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91 public static String read(File file)
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92 throws IOException
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93 {
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94 Reader in = new FileReader(file);
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95 String s = readAll(in);
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96 in.close();
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97 return s;
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98 }
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100
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101 public static LuaFunction loadfile(LuaState lua,String fileName) throws LuaException,IOException {
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102 return load(lua,read(new File(fileName)));
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103 }
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104
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105 private static class TableIter {
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106 private final Iterator<Map.Entry<Object,Object>> iter;
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107
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108 TableIter(LuaTable t) {
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109 this.iter = t.iterator();
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110 }
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111
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112 public Object[] next() {
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113 if( !iter.hasNext() )
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114 return LuaFunction.EMPTY_RTN;
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115 Map.Entry<Object,Object> entry = iter.next();
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116 return new Object[]{entry.getKey(),entry.getValue()};
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117 }
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118 }
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119
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120 public static LuaFunction pairs(LuaTable t) {
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121 try {
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122 TableIter ti = new TableIter(t);
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123 Method m = TableIter.class.getMethod("next");
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124 m.setAccessible(true);
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125 return new LuaJavaFunction(m,ti);
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126 } catch(NoSuchMethodException e) {
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127 throw new RuntimeException(e);
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128 }
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129 }
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130
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131 private static class ArrayIter {
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132 private final LuaTable t;
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133 private double i = 0.0;
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134
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135 ArrayIter(LuaTable t) {
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136 this.t = t;
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137 }
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138
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139 public Object[] next() {
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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 public static LuaFunction ipairs(LuaTable t) {
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147 try {
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148 ArrayIter ai = new ArrayIter(t);
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149 Method m = ArrayIter.class.getMethod("next");
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150 m.setAccessible(true);
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151 return new LuaJavaFunction(m,ai);
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152 } catch(NoSuchMethodException e) {
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153 throw new RuntimeException(e);
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154 }
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155 }
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156 }