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annotate core/src/luan/modules/PackageLuan.java @ 372:f08cefa4594c

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author Franklin Schmidt <fschmidt@gmail.com>
date Fri, 17 Apr 2015 07:58:20 -0600
parents 673eebd83b74
children 23b99a5039b5
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4c0131c2b650 merge luan/lib into modules
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1 package luan.modules;
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3 import java.io.IOException;
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4 import java.util.Arrays;
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5 import java.util.Collections;
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6 import luan.Luan;
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7 import luan.LuanState;
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8 import luan.LuanTable;
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9 import luan.LuanFunction;
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10 import luan.LuanJavaFunction;
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11 import luan.LuanElement;
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12 import luan.LuanException;
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15 public final class PackageLuan {
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17 public static final LuanFunction requireFn;
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18 static {
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19 try {
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20 requireFn = new LuanJavaFunction(PackageLuan.class.getMethod("require",LuanState.class,String.class),null);
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21 } catch(NoSuchMethodException e) {
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22 throw new RuntimeException(e);
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23 }
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24 }
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26 public static LuanTable loaded(LuanState luan) {
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27 LuanTable tbl = (LuanTable)luan.registry().get("Package.loaded");
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28 if( tbl == null ) {
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29 tbl = Luan.newTable();
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30 luan.registry().put("Package.loaded",tbl);
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31 }
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32 return tbl;
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33 }
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35 public static Object require(LuanState luan,String modName) throws LuanException {
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36 Object mod = load(luan,modName);
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37 if( mod==null )
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38 throw luan.exception( "module '"+modName+"' not found" );
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39 return mod;
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40 }
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41
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42 public static Object load(LuanState luan,String modName) throws LuanException {
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43 LuanTable loaded = loaded(luan);
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44 Object mod = loaded.get(modName);
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45 if( mod == null ) {
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46 if( modName.startsWith("java:") ) {
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47 mod = JavaLuan.load(luan,modName.substring(5));
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48 } else {
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49 String src = read(luan,modName+".luan");
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50 if( src == null )
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51 return null;
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52 LuanTable env = Luan.newTable();
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53 LuanFunction loader = BasicLuan.load(luan,src,modName,env,false);
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54 Object result = Luan.first(
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55 luan.call(loader,"<require \""+modName+"\">",new Object[]{modName})
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56 );
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57 mod = result!=null ? result : env;
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58 }
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59 loaded.put(modName,mod);
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60 }
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61 return mod;
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62 }
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64 static String read(LuanState luan,String uri) throws LuanException {
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65 LuanTable t = IoLuan.Uri(luan,uri);
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66 if( t == null )
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67 return null;
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68 LuanFunction existsFn = (LuanFunction)t.get("exists");
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69 boolean exists = (Boolean)Luan.first(luan.call(existsFn));
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70 if( !exists )
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71 return null;
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72 LuanFunction reader = (LuanFunction)t.get("read_text");
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73 return (String)Luan.first(luan.call(reader));
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74 }
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76 }