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annotate core/src/luan/modules/PackageLuan.java @ 327:0be73ac9103d

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handle circular package loading git-svn-id: https://luan-java.googlecode.com/svn/trunk@328 21e917c8-12df-6dd8-5cb6-c86387c605b9
author fschmidt@gmail.com <fschmidt@gmail.com@21e917c8-12df-6dd8-5cb6-c86387c605b9>
date Thu, 19 Mar 2015 05:36:05 +0000
parents d34be4588556
children 673eebd83b74
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 package luan.modules;
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2
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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 java.util.Set;
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7 import java.util.HashSet;
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8 import luan.Luan;
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9 import luan.LuanState;
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10 import luan.LuanTable;
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11 import luan.LuanFunction;
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12 import luan.LuanJavaFunction;
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13 import luan.LuanElement;
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14 import luan.LuanException;
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15
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16
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17 public final class PackageLuan {
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18
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19 public static final LuanFunction requireFn;
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20 static {
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21 try {
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22 requireFn = new LuanJavaFunction(PackageLuan.class.getMethod("require",LuanState.class,String.class),null);
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23 } catch(NoSuchMethodException e) {
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24 throw new RuntimeException(e);
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25 }
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26 }
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27
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28 public static LuanTable loaded(LuanState luan) {
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29 LuanTable tbl = (LuanTable)luan.registry().get("Package.loaded");
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30 if( tbl == null ) {
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31 tbl = Luan.newTable();
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32 luan.registry().put("Package.loaded",tbl);
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33 }
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34 return tbl;
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35 }
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36
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37 public static Object require(LuanState luan,String modName) throws LuanException {
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38 Object mod = load(luan,modName);
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39 if( mod==null )
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40 throw luan.exception( "module '"+modName+"' not found" );
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41 return mod;
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42 }
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43
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44 public static Object load(LuanState luan,String modName) throws LuanException {
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45 LuanTable loaded = loaded(luan);
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46 Object mod = loaded.get(modName);
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47 if( mod == null ) {
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48 if( modName.startsWith("java:") ) {
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49 mod = JavaLuan.load(luan,modName.substring(5));
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50 if( mod != null )
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51 loaded.put(modName,mod);
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52 } else {
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53 String src = read(luan,modName+".luan");
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54 if( src == null )
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55 return null;
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56 LuanTable env = Luan.newTable();
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57 LuanFunction loader = BasicLuan.load(luan,src,modName,env,false);
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58 loaded.put(modName,env);
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59 @SuppressWarnings("unchecked")
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60 Set<String> loading = (Set<String>)luan.registry().get("Package.loading");
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61 boolean top = loading==null;
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62 if(top) {
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63 loading = new HashSet<String>();
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64 luan.registry().put("Package.loading",loading);
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65 }
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66 loading.add(modName);
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67 boolean ok = false;
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68 try {
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69 mod = Luan.first(
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70 luan.call(loader,"<require \""+modName+"\">",new Object[]{modName})
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71 );
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72 ok = true;
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73 } finally {
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74 if( !ok ) {
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75 if(top) {
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76 for( String mn : loading ) {
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77 loaded.put(mn,null);
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78 }
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79 } else {
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80 loaded.put(modName,null);
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81 }
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82 }
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83 if(top)
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84 luan.registry().put("Package.loading",null);
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85 }
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86 if( mod != null )
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87 loaded.put(modName,mod);
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88 else
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89 mod = env;
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90 }
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91 }
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92 return mod;
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93 }
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94
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95 static String read(LuanState luan,String uri) throws LuanException {
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96 LuanTable t = IoLuan.Uri(luan,uri);
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97 if( t == null )
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98 return null;
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99 LuanFunction existsFn = (LuanFunction)t.get("exists");
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100 boolean exists = (Boolean)Luan.first(luan.call(existsFn));
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101 if( !exists )
a6bf8ff720f8 add java security
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102 return null;
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a74559240b4f simplify PackageLuan and remove IO loading param
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103 LuanFunction reader = (LuanFunction)t.get("read_text");
a74559240b4f simplify PackageLuan and remove IO loading param
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104 return (String)Luan.first(luan.call(reader));
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105 }
f86e4f77ef32 add package module
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106
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107 }