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annotate src/luan/LuaState.java @ 40:e3624b7cd603

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implement stack trace git-svn-id: https://luan-java.googlecode.com/svn/trunk@41 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Fri, 21 Dec 2012 10:45:54 +0000
parents 8a57ebfdfd78
children 786699c78837
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fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
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1 package luan;
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3 import java.util.List;
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4 import java.util.ArrayList;
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7 public abstract class LuaState {
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8 private final LuaTable global = new LuaTable();
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9 private final List<MetatableGetter> mtGetters = new ArrayList<MetatableGetter>();
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10 final List<StackTraceElement> stackTrace = new ArrayList<StackTraceElement>();
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12 public final LuaTable global() {
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13 return global;
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14 }
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16 public final LuaTable getMetatable(Object obj) {
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17 if( obj instanceof LuaTable ) {
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18 LuaTable table = (LuaTable)obj;
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19 return table.getMetatable();
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20 }
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21 for( MetatableGetter mg : mtGetters ) {
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22 LuaTable table = mg.getMetatable(obj);
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23 if( table != null )
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24 return table;
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25 }
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26 return null;
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27 }
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29 public final void addMetatableGetter(MetatableGetter mg) {
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30 mtGetters.add(mg);
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31 }
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33 public Object[] call(LuaFunction fn,LuaElement calledFrom,String fnName,Object... args) throws LuaException {
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34 stackTrace.add( new StackTraceElement(calledFrom,fnName) );
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35 try {
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36 return fn.call(this,args);
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37 } finally {
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38 stackTrace.remove(stackTrace.size()-1);
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39 }
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40 }
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42 public final String checkString(LuaElement el,Object obj) throws LuaException {
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43 String s = Lua.asString(obj);
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44 if( s == null )
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45 throw new LuaException( this, el, "attempt to use a " + Lua.type(obj) + " as a string" );
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46 return s;
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47 }
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49 public final LuaNumber checkNumber(LuaElement el,Object obj) throws LuaException {
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50 LuaNumber n = Lua.toNumber(obj);
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51 if( n == null )
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52 throw new LuaException( this, el, "attempt to perform arithmetic on a " + Lua.type(obj) + " value" );
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53 return n;
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54 }
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56 public final LuaFunction checkFunction(LuaElement el,Object obj) throws LuaException {
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57 if( obj instanceof LuaFunction )
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58 return (LuaFunction)obj;
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59 throw new LuaException( this, el, "attempt to call a " + Lua.type(obj) + " value" );
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60 }
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62 public final String toString(LuaElement el,Object obj) throws LuaException {
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63 LuaFunction fn = getHandlerFunction(el,"__tostring",obj);
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64 if( fn != null )
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65 return checkString( el, Lua.first( call(fn,el,"__tostring",obj) ) );
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66 if( obj == null )
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67 return "nil";
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68 return obj.toString();
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69 }
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71 public final LuaFunction getHandlerFunction(LuaElement el,String op,Object obj) throws LuaException {
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72 Object f = getHandler(op,obj);
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73 if( f == null )
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74 return null;
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75 return checkFunction(el,f);
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76 }
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78 public final Object getHandler(String op,Object obj) {
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79 LuaTable t = getMetatable(obj);
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80 return t==null ? null : t.get(op);
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81 }
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83 }