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annotate src/luan/interp/LuanCompiler.java @ 149:f99fd64291b3

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change load() to take env instead of using global git-svn-id: https://luan-java.googlecode.com/svn/trunk@150 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Mon, 16 Jun 2014 05:47:54 +0000
parents f0a4abe58593
children f35c50027985
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1 package luan.interp;
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2
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3 import luan.LuanFunction;
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4 import luan.LuanState;
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5 import luan.LuanException;
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6 import luan.LuanSource;
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7 import luan.LuanElement;
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8 import luan.LuanTable;
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9 import luan.parser.ParseException;
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10 import java.util.Map;
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13 public final class LuanCompiler {
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14 private LuanCompiler() {} // never
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16 private static LuanFunction compile(LuanState luan,LuanSource src,boolean allowExpr) throws LuanException {
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17 UpValue.Getter envGetter = new UpValue.EnvGetter();
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18 LuanParser parser = new LuanParser(src,envGetter);
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19 for( Map.Entry<Object,Object> entry : luan.global() ) {
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20 Object key = entry.getKey();
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21 if( key instanceof String )
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22 parser.addVar( (String)key, entry.getValue() );
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23 }
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24 FnDef fnDef = parse(luan,parser,allowExpr);
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25 final Closure c = new Closure((LuanStateImpl)luan,fnDef);
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26 return new LuanFunction() {
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27 @Override public Object call(LuanState luan,Object[] args) throws LuanException {
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28 Object rtn = c.call(luan,args);
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29 if( rtn instanceof Object[] && ((Object[])rtn).length==0 )
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30 rtn = c.upValues()[0].get();
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31 return rtn;
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32 }
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33 };
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34 }
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36 public static LuanFunction compile(LuanState luan,LuanSource src,LuanTable env,boolean allowExpr) throws LuanException {
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37 if( env==null )
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38 return compile(luan,src,allowExpr);
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39 UpValue.Getter envGetter = new UpValue.ValueGetter(env);
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40 LuanParser parser = new LuanParser(src,envGetter);
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41 FnDef fnDef = parse(luan,parser,allowExpr);
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42 return new Closure((LuanStateImpl)luan,fnDef);
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43 }
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44
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45 private static FnDef parse(LuanState luan,LuanParser parser,boolean allowExpr) throws LuanException {
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46 try {
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47 if( allowExpr ) {
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48 FnDef fnDef = parser.Expressions();
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49 if( fnDef != null )
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50 return fnDef;
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51 }
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52 return parser.RequiredModule();
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53 } catch(ParseException e) {
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54 //e.printStackTrace();
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55 LuanElement le = new LuanSource.CompilerElement(parser.source);
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56 throw luan.bit(le).exception( e.getFancyMessage() );
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57 }
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58 }
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60 public static LuanState newLuanState() {
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61 return new LuanStateImpl();
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62 }
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63 }