Mercurial Hosting > luan
annotate src/luan/lib/BasicLib.java @ 14:2ddf85634d20
whitespace handling;
comments;
if/while/repeat statements;
git-svn-id: https://luan-java.googlecode.com/svn/trunk@15 21e917c8-12df-6dd8-5cb6-c86387c605b9
author | fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9> |
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date | Mon, 26 Nov 2012 10:18:46 +0000 |
parents | 3b22ffbdb83a |
children | a7c13c6017f7 |
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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 org.parboiled.Parboiled; |
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6 import org.parboiled.errors.ErrorUtils; |
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7 import org.parboiled.parserunners.ReportingParseRunner; |
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8 import org.parboiled.parserunners.TracingParseRunner; |
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9 import org.parboiled.support.ParsingResult; |
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10 import luan.Lua; |
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11 import luan.LuaState; |
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12 import luan.LuaTable; |
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13 import luan.LuaFunction; |
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14 import luan.LuaJavaFunction; |
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15 import luan.LuaException; |
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16 import luan.interp.LuaParser; |
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17 import luan.interp.Expressions; |
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18 import luan.interp.Stmt; |
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19 |
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20 |
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21 public class BasicLib { |
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22 |
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23 public static void register(LuaState lua) { |
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24 LuaTable t = lua.env(); |
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25 add( t, "print", new Object[0].getClass() ); |
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26 add( t, "type", Object.class ); |
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27 } |
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28 |
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29 private static void add(LuaTable t,String method,Class<?>... parameterTypes) { |
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30 try { |
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31 t.set( method, new LuaJavaFunction(BasicLib.class.getMethod(method,parameterTypes),null) ); |
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32 } catch(NoSuchMethodException e) { |
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33 throw new RuntimeException(e); |
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34 } |
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35 } |
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36 |
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37 public static void print(Object... args) { |
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38 for( int i=0; i<args.length; i++ ) { |
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39 if( i > 0 ) |
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40 System.out.print('\t'); |
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41 System.out.print( Lua.toString(args[i]) ); |
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42 } |
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43 System.out.println(); |
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44 } |
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45 |
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46 public static String type(Object obj) { |
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47 return Lua.type(obj); |
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48 } |
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49 |
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50 public static LuaFunction load(String ld) throws LuaException { |
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51 LuaParser parser = Parboiled.createParser(LuaParser.class); |
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52 ParsingResult<?> result = new ReportingParseRunner(parser.Target()).run(ld); |
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53 // ParsingResult<?> result = new TracingParseRunner(parser.Target()).run(ld); |
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54 if( result.hasErrors() ) |
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55 throw new LuaException( ErrorUtils.printParseErrors(result) ); |
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56 Object resultValue = result.resultValue; |
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57 if( resultValue instanceof Expressions ) { |
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58 final Expressions expressions = (Expressions)resultValue; |
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59 return new LuaFunction() { |
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60 public Object[] call(LuaState lua,Object... args) throws LuaException { |
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61 return expressions.eval(lua); |
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62 } |
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63 }; |
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64 } |
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65 final Stmt stmt = (Stmt)resultValue; |
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66 return new LuaFunction() { |
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67 public Object[] call(LuaState lua,Object... args) throws LuaException { |
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68 stmt.eval(lua); |
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69 return LuaFunction.EMPTY_RTN; |
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70 } |
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71 }; |
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72 } |
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73 |
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74 public static String readFile(String fileName) throws IOException { |
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75 StringBuilder sb = new StringBuilder(); |
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76 FileReader in = new FileReader(fileName); |
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77 char[] buf = new char[8192]; |
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78 int n; |
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79 while( (n=in.read(buf)) != -1 ) { |
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80 sb.append(buf,0,n); |
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81 } |
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82 return sb.toString(); |
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83 } |
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84 |
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85 public static LuaFunction loadFile(String fileName) throws LuaException,IOException { |
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86 return load(readFile(fileName)); |
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87 } |
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88 |
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89 } |