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annotate core/src/luan/impl/LuanCompiler.java @ 195:24ede40ee0aa

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make MetatableGetter DeepCloneable, scoped, and secure git-svn-id: https://luan-java.googlecode.com/svn/trunk@196 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Thu, 03 Jul 2014 08:19:48 +0000
parents 08df375e2e5f
children 5ba136769034
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 package luan.impl;
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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 java.util.Map;
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11
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12 public final class LuanCompiler {
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13 private LuanCompiler() {} // never
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14
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15 public static LuanFunction compile(LuanState luan,LuanSource src,LuanTable env,boolean allowExpr) throws LuanException {
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16 boolean passedEnv = env != null;
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17 if( !passedEnv )
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18 env = new LuanTable();
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19 UpValue.Getter envGetter = new UpValue.ValueGetter(env);
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20 LuanParser parser = new LuanParser(src,envGetter);
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21 for( Map.Entry<Object,Object> entry : luan.global() ) {
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22 Object key = entry.getKey();
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23 if( key instanceof String )
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24 parser.addVar( (String)key, entry.getValue() );
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25 }
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26 FnDef fnDef = parse(luan,parser,allowExpr);
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27 final LuanStateImpl luanImpl = (LuanStateImpl)luan;
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28 MtGetterLink mtGetterLink = (MtGetterLink)env.get("_MTG");
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29 final Closure c = new Closure(luanImpl,fnDef,mtGetterLink);
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30 final LuanTable ENV = env;
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31 if( passedEnv ) {
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32 return new LuanFunction() {
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33 @Override public Object call(LuanState luan,Object[] args) throws LuanException {
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34 Object rtn = c.call(luan,args);
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35 ENV.put("_MTG",luanImpl.mtGetterLink);
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36 return rtn;
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37 }
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38 };
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39 } else {
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40 return new LuanFunction() {
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41 @Override public Object call(LuanState luan,Object[] args) throws LuanException {
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42 Object rtn = c.call(luan,args);
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43 if( rtn instanceof Object[] && ((Object[])rtn).length==0 )
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44 rtn = ENV;
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45 return rtn;
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46 }
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47 };
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48 }
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49 }
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50
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51 private static FnDef parse(LuanState luan,LuanParser parser,boolean allowExpr) throws LuanException {
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52 try {
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53 if( allowExpr ) {
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54 FnDef fnDef = parser.Expression();
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55 if( fnDef != null )
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56 return fnDef;
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57 }
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58 return parser.RequiredModule();
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59 } catch(ParseException e) {
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60 //e.printStackTrace();
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61 LuanElement le = new LuanSource.CompilerElement(parser.source);
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62 throw luan.bit(le).exception( e.getFancyMessage() );
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63 }
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64 }
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65
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66 public static LuanState newLuanState() {
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67 return new LuanStateImpl();
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68 }
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69 }