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annotate src/luan/modules/PackageLuan.java @ 1283:503bde9a7c80

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add luan.require() and table.call()
author Franklin Schmidt <fschmidt@gmail.com>
date Fri, 21 Dec 2018 09:12:09 -0700
parents 781ec0a92bb5
children 2c8d1d76a82a
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
167
4c0131c2b650 merge luan/lib into modules
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1 package luan.modules;
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2
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3 import java.io.Reader;
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4 import java.io.InputStreamReader;
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5 import java.io.IOException;
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6 import java.util.Arrays;
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7 import java.util.Collections;
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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.LuanCloner;
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14 import luan.LuanException;
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16
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17 public final class PackageLuan {
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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 = new LuanTable(luan);
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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.equals(Boolean.FALSE) )
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40 throw new LuanException( "module '"+modName+"' not found" );
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41 return mod;
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42 }
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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.rawGet(modName);
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47 if( mod == null ) {
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48 if( modName.equals("luan:Boot.luan") ) {
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49 String src;
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50 try {
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51 Reader in = new InputStreamReader(ClassLoader.getSystemResourceAsStream("luan/modules/Boot.luan"));
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52 src = Utils.readAll(in);
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53 in.close();
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54 } catch(IOException e) {
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55 throw new RuntimeException(e);
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56 }
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57 LuanFunction loader = Luan.load(src,modName);
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58 mod = Luan.first(
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59 loader.call(luan,new Object[]{modName})
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60 );
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61 if( mod == null )
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62 throw new RuntimeException();
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63 } else if( modName.startsWith("java:") ) {
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64 mod = JavaLuan.load(luan,modName.substring(5));
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65 if( mod == null )
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66 mod = Boolean.FALSE;
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67 } else {
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68 String src = read(luan,modName);
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69 if( src == null ) {
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70 mod = Boolean.FALSE;
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71 } else {
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72 LuanFunction loader = Luan.load(src,modName);
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73 mod = Luan.first(
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74 loader.call(luan,new Object[]{modName})
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75 );
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76 if( mod == null ) {
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77 mod = loaded.rawGet(modName);
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78 if( mod != null )
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79 return mod;
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80 throw new LuanException( "module '"+modName+"' returned nil" );
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81 }
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82 }
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83 }
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84 loaded.rawPut(modName,mod);
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85 }
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86 return mod;
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87 }
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88
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89 static String read(LuanState luan,String uri) throws LuanException {
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90 LuanTable boot = (LuanTable)luan.require("luan:Boot.luan");
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91 return (String)Luan.first(boot.call("read",uri));
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92 }
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93
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94 public static void enableLoad(LuanState luan,String... mods) throws LuanException {
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95 if( !luan.isLocked )
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96 return;
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97 LuanTable loaded = loaded(luan);
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98 for( String mod : mods ) {
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99 if( loaded.rawGet(mod) == null ) {
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100 luan.isLocked = false;
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101 luan.deepenClone(luan,new LuanCloner(LuanCloner.Type.COMPLETE));
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102 break;
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103 }
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104 }
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105 }
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106
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107 }