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annotate src/luan/modules/PackageLuan.java @ 1802:ca98dee04e08 default tip

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add Parsers.json_null
author Franklin Schmidt <fschmidt@gmail.com>
date Sun, 21 Apr 2024 21:25:15 -0600
parents a37ffe2d1b14
children
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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 java.util.Map;
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9 import java.util.HashMap;
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10 import goodjava.io.IoUtils;
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11 import luan.Luan;
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12 import luan.LuanTable;
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13 import luan.LuanFunction;
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14 import luan.LuanJavaFunction;
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15 import luan.LuanException;
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16
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17
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18 public final class PackageLuan {
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19
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20 public static LuanFunction requireFn(Luan luan) {
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21 LuanFunction fn = (LuanFunction)luan.registry().get("Package.require");
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22 if( fn == null ) {
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23 try {
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24 fn = new LuanJavaFunction(PackageLuan.class.getMethod("require",Luan.class,String.class,LuanTable.class),null);
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25 } catch(NoSuchMethodException e) {
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26 throw new RuntimeException(e);
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27 }
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28 luan.registry().put("Package.require",fn);
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29 }
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30 return fn;
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31 }
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32
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33 public static Map loaded(Luan luan) {
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34 Map map = (Map)luan.registry().get("Package.loaded");
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35 if( map == null ) {
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36 map = new HashMap();
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37 luan.registry().put("Package.loaded",map);
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38 }
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39 return map;
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40 }
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41
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42 public static Object require(Luan luan,String modName,LuanTable options) throws LuanException {
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43 if( "java".equals(modName) ) {
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44 JavaLuan.java(luan);
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45 return true;
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46 }
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47 Object mod = load(luan,modName,options);
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48 if( mod.equals(Boolean.FALSE) )
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49 throw new LuanException( "module '"+modName+"' not found" );
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50 return mod;
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51 }
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52
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53 public static Object load(Luan luan,String modName,LuanTable options) throws LuanException {
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54 Map loaded = loaded(luan);
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55 Object mod = loaded.get(modName);
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56 if( mod == null ) {
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57 if( modName.equals("luan:Boot.luan") ) {
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58 String src;
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59 try {
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60 Reader in = new InputStreamReader(ClassLoader.getSystemResourceAsStream("luan/modules/Boot.luan"));
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61 src = IoUtils.readAll(in);
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62 in.close();
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63 } catch(IOException e) {
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64 throw new RuntimeException(e);
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65 }
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66 LuanFunction loader = luan.load(src,modName,true);
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67 mod = Luan.first(
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68 loader.call(luan,modName)
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69 );
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70 if( mod == null )
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71 throw new RuntimeException();
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72 } else if( modName.startsWith("java:") ) {
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73 mod = JavaLuan.load(luan,modName.substring(5));
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74 if( mod == null )
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75 mod = Boolean.FALSE;
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76 } else {
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77 String src = read(luan,modName,options);
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78 if( src == null ) {
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79 mod = Boolean.FALSE;
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80 } else {
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81 LuanFunction loader = luan.load(src,modName,true);
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82 mod = Luan.first(
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83 loader.call(luan,modName)
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84 );
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85 if( mod == null ) {
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86 mod = loaded.get(modName);
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87 if( mod != null )
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88 return mod;
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89 throw new LuanException( "module '"+modName+"' returned nil" );
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90 }
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91 }
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92 }
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93 loaded.put(modName,mod);
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94 }
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95 return mod;
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96 }
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97
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98 static String read(Luan luan,String uri,LuanTable options) {
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99 LuanTable boot;
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100 try {
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101 boot = (LuanTable)luan.require("luan:Boot.luan");
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102 } catch(LuanException e) {
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103 throw new RuntimeException(e);
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104 }
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105 Luan.Security security = Luan.setSecurity(luan,null);
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106 try {
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107 return (String)Luan.first(boot.fn(luan,"read").call(luan,uri,options));
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108 } catch(LuanException e) {
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109 return null;
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110 } finally {
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111 if( security != null )
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112 Luan.setSecurity(luan,security);
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113 }
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114 }
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115
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116 }