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annotate src/luan/lib/BasicLib.java @ 12:9cea1aea5eef

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CmdLine can run files git-svn-id: https://luan-java.googlecode.com/svn/trunk@13 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Fri, 23 Nov 2012 10:37:40 +0000
parents 8217d8485715
children 3b22ffbdb83a
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1 package luan.lib;
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2
12
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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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21 public class BasicLib {
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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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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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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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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 if( result.hasErrors() )
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54 throw new LuaException( ErrorUtils.printParseErrors(result) );
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55 Object resultValue = result.resultValue;
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56 if( resultValue instanceof Expressions ) {
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57 final Expressions expressions = (Expressions)resultValue;
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58 return new LuaFunction() {
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59 public Object[] call(LuaState lua,Object... args) throws LuaException {
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60 return expressions.eval(lua).toArray();
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61 }
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62 };
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63 }
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64 final Stmt stmt = (Stmt)resultValue;
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65 return new LuaFunction() {
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66 public Object[] call(LuaState lua,Object... args) throws LuaException {
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67 stmt.eval(lua);
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68 return LuaFunction.EMPTY_RTN;
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69 }
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70 };
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71 }
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73 public static String readFile(String fileName) throws IOException {
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74 StringBuilder sb = new StringBuilder();
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75 FileReader in = new FileReader(fileName);
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76 char[] buf = new char[8192];
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77 int n;
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78 while( (n=in.read(buf)) != -1 ) {
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79 sb.append(buf,0,n);
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80 }
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81 return sb.toString();
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82 }
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83
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84 public static LuaFunction loadFile(String fileName) throws LuaException,IOException {
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85 return load(readFile(fileName));
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86 }
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88 }