| 1 | package jagi.fs; |
| 2 | |
| 3 | import java.util.*; |
| 4 | import java.util.regex.*; |
| 5 | import java.nio.file.*; |
| 6 | import java.nio.file.attribute.*; |
| 7 | import java.io.*; |
| 8 | import java.net.*; |
| 9 | import javax.tools.*; |
| 10 | |
| 11 | public class Compiler { |
| 12 | private final Map<Path, Module> modules = new HashMap<>(); |
| 13 | |
| 14 | public static class FilePart extends SimpleJavaFileObject { |
| 15 | public final Path file; |
| 16 | public final String clnm; |
| 17 | public final CharSequence src; |
| 18 | |
| 19 | private static URI dummyuri(Path file, String clnm) { |
| 20 | String clp = clnm.replace('.', '/') + Kind.SOURCE.extension; |
| 21 | return(URI.create(file.toUri().toString() + "!/" + clp)); |
| 22 | } |
| 23 | |
| 24 | public FilePart(Path file, String clnm, CharSequence src) { |
| 25 | super(dummyuri(file, clnm), Kind.SOURCE); |
| 26 | this.file = file; |
| 27 | this.clnm = clnm; |
| 28 | this.src = src; |
| 29 | } |
| 30 | |
| 31 | public CharSequence getCharContent(boolean ice) { |
| 32 | return(src); |
| 33 | } |
| 34 | |
| 35 | private static final Pattern classpat = Pattern.compile("^((public|abstract)\\s+)*(class|interface)\\s+(\\S+)"); |
| 36 | public static Collection<FilePart> split(Path file) throws IOException { |
| 37 | Collection<FilePart> ret = new ArrayList<>(); |
| 38 | StringBuilder head = new StringBuilder(); |
| 39 | StringBuilder cur = null; |
| 40 | String clnm = null; |
| 41 | try(BufferedReader fp = Files.newBufferedReader(file)) { |
| 42 | for(String ln = fp.readLine(); ln != null; ln = fp.readLine()) { |
| 43 | Matcher m = classpat.matcher(ln); |
| 44 | if(m.find()) { |
| 45 | if(cur != null) |
| 46 | ret.add(new FilePart(file, clnm, cur)); |
| 47 | clnm = m.group(4); |
| 48 | cur = new StringBuilder(); |
| 49 | cur.append(head); |
| 50 | } |
| 51 | if(cur != null) { |
| 52 | cur.append(ln); cur.append('\n'); |
| 53 | } else { |
| 54 | head.append(ln); head.append('\n'); |
| 55 | } |
| 56 | } |
| 57 | if(cur != null) |
| 58 | ret.add(new FilePart(file, clnm, cur)); |
| 59 | } |
| 60 | return(ret); |
| 61 | } |
| 62 | } |
| 63 | |
| 64 | public static class ClassOutput extends SimpleJavaFileObject { |
| 65 | public final String name; |
| 66 | private final ByteArrayOutputStream buf = new ByteArrayOutputStream(); |
| 67 | |
| 68 | public ClassOutput(String name) { |
| 69 | super(URI.create("mem://" + name), Kind.CLASS); |
| 70 | this.name = name; |
| 71 | } |
| 72 | |
| 73 | public OutputStream openOutputStream() { |
| 74 | return(buf); |
| 75 | } |
| 76 | } |
| 77 | |
| 78 | public static class FileContext extends ForwardingJavaFileManager<JavaFileManager> { |
| 79 | public final Collection<ClassOutput> output = new ArrayList<>(); |
| 80 | |
| 81 | public FileContext(JavaCompiler javac) { |
| 82 | super(javac.getStandardFileManager(null, null, null)); |
| 83 | } |
| 84 | |
| 85 | public JavaFileObject getJavaFileForOutput(Location location, String name, JavaFileObject.Kind kind, FileObject sibling) { |
| 86 | ClassOutput cl = new ClassOutput(name); |
| 87 | output.add(cl); |
| 88 | return(cl); |
| 89 | } |
| 90 | } |
| 91 | |
| 92 | public static class CompilationException extends RuntimeException { |
| 93 | public final Path file; |
| 94 | private final List<Diagnostic<? extends JavaFileObject>> messages; |
| 95 | |
| 96 | public CompilationException(Path file, List<Diagnostic<? extends JavaFileObject>> messages) { |
| 97 | this.file = file; |
| 98 | this.messages = messages; |
| 99 | } |
| 100 | |
| 101 | public String getMessage() { |
| 102 | return(file + ": compilation failed"); |
| 103 | } |
| 104 | |
| 105 | public String messages() { |
| 106 | StringBuilder buf = new StringBuilder(); |
| 107 | for(Diagnostic msg : messages) |
| 108 | buf.append(msg.toString() + "\n"); |
| 109 | return(buf.toString()); |
| 110 | } |
| 111 | |
| 112 | public void printStackTrace(PrintStream out) { |
| 113 | out.print(messages()); |
| 114 | super.printStackTrace(out); |
| 115 | } |
| 116 | } |
| 117 | |
| 118 | public static Collection<ClassOutput> compile(Path file) throws IOException { |
| 119 | List<String> opt = Arrays.asList(); |
| 120 | JavaCompiler javac = ToolProvider.getSystemJavaCompiler(); |
| 121 | if(javac == null) |
| 122 | throw(new RuntimeException("no javac present")); |
| 123 | Collection<FilePart> files; |
| 124 | files = FilePart.split(file); |
| 125 | DiagnosticCollector<JavaFileObject> out = new DiagnosticCollector<>(); |
| 126 | FileContext fs = new FileContext(javac); |
| 127 | JavaCompiler.CompilationTask job = javac.getTask(null, fs, out, opt, null, files); |
| 128 | if(!job.call()) |
| 129 | throw(new CompilationException(file, out.getDiagnostics())); |
| 130 | return(fs.output); |
| 131 | } |
| 132 | |
| 133 | public static class BufferedClassLoader extends ClassLoader { |
| 134 | public final Map<String, byte[]> contents; |
| 135 | |
| 136 | public BufferedClassLoader(Collection<ClassOutput> contents) { |
| 137 | this.contents = new HashMap<>(); |
| 138 | for(ClassOutput clc : contents) |
| 139 | this.contents.put(clc.name, clc.buf.toByteArray()); |
| 140 | } |
| 141 | |
| 142 | public Class<?> findClass(String name) throws ClassNotFoundException { |
| 143 | byte[] c = contents.get(name); |
| 144 | if(c == null) |
| 145 | throw(new ClassNotFoundException(name)); |
| 146 | return(defineClass(name, c, 0, c.length)); |
| 147 | } |
| 148 | } |
| 149 | |
| 150 | public static class Module { |
| 151 | public final Path file; |
| 152 | private FileTime mtime = null; |
| 153 | private ClassLoader code = null; |
| 154 | |
| 155 | private Module(Path file) { |
| 156 | this.file = file; |
| 157 | } |
| 158 | |
| 159 | public void update() throws IOException { |
| 160 | synchronized(this) { |
| 161 | FileTime mtime = Files.getLastModifiedTime(file); |
| 162 | if((this.mtime == null) || (this.mtime.compareTo(mtime) < 0)) { |
| 163 | code = new BufferedClassLoader(compile(file)); |
| 164 | this.mtime = mtime; |
| 165 | } |
| 166 | } |
| 167 | } |
| 168 | |
| 169 | public ClassLoader code() { |
| 170 | if(code == null) |
| 171 | throw(new RuntimeException("module has not yet been updated")); |
| 172 | return(code); |
| 173 | } |
| 174 | } |
| 175 | |
| 176 | public Module module(Path file) { |
| 177 | synchronized(modules) { |
| 178 | Module ret = modules.get(file); |
| 179 | if(ret == null) |
| 180 | modules.put(file, ret = new Module(file)); |
| 181 | return(ret); |
| 182 | } |
| 183 | } |
| 184 | |
| 185 | private static Compiler global = null; |
| 186 | public static Compiler get() { |
| 187 | if(global == null) { |
| 188 | synchronized(Compiler.class) { |
| 189 | if(global == null) |
| 190 | global = new Compiler(); |
| 191 | } |
| 192 | } |
| 193 | return(global); |
| 194 | } |
| 195 | } |