src/jagi/fs/Compiler.java

   1 package jagi.fs;
   2
   3 import jagi.*;
   4 import java.util.*;
   5 import java.util.regex.*;
   6 import java.nio.file.*;
   7 import java.nio.file.attribute.*;
   8 import java.io.*;
   9 import java.net.*;
  10
  11 public class Compiler {
  12     private final Map<Path, File> files = new HashMap<>();
  13     private final Map<Path, ClassLoader> libs = new HashMap<>();
  14     private final Collection<Path> searchpath = new ArrayList<>();
  15
  16     public Compiler() {
  17         String syspath = System.getenv("PATH");
  18         if(syspath != null) {
  19             String sep = java.io.File.pathSeparator;
  20             int p1 = 0, p2 = syspath.indexOf(sep);
  21             do {
  22                 String el;
  23                 if(p2 >= 0) {
  24                     el = syspath.substring(p1, p2);
  25                     p1 = p2 + sep.length();
  26                     p2 = syspath.indexOf(sep, p1);
  27                 } else {
  28                     el =syspath.substring(p1);
  29                 }
  30                 try {
  31                     Path p = Paths.get(el);
  32                     if(p.getParent() != null)
  33                         searchpath.add(p.getParent().resolve("share").resolve("java"));
  34                 } catch(InvalidPathException e) {
  35                     continue;
  36                 }
  37             } while(p2 >= 0);
  38         }
  39         String proppath = System.getProperty("jagi.search-path");
  40         if(proppath != null) {
  41             for(String el : proppath.split(":")) {
  42                 try {
  43                     searchpath.add(Paths.get(el));
  44                 } catch(InvalidPathException e) {
  45                     continue;
  46                 }
  47             }
  48         }
  49     }
  50
  51     public static class ClassOutput {
  52         public final String name;
  53         public final ByteArrayOutputStream buf = new ByteArrayOutputStream();
  54
  55         public ClassOutput(String name) {
  56             this.name = name;
  57         }
  58     }
  59
  60     public static class CompilationException extends RuntimeException {
  61         public final Path file;
  62         private final List<? extends Object> messages;
  63
  64         public CompilationException(Path file, List<? extends Object> messages) {
  65             this.file = file;
  66             this.messages = messages;
  67         }
  68
  69         public String getMessage() {
  70             return(file + ": compilation failed");
  71         }
  72
  73         public String messages() {
  74             StringBuilder buf = new StringBuilder();
  75             for(Object msg : messages)
  76                 buf.append(msg.toString() + "\n");
  77             return(buf.toString());
  78         }
  79
  80         public void printStackTrace(PrintStream out) {
  81             out.print(messages());
  82             super.printStackTrace(out);
  83         }
  84     }
  85
  86     public static class Compilation implements AutoCloseable {
  87         public final Path dir, srcdir, outdir;
  88         private final List<Path> infiles = new ArrayList<>();
  89         private final List<Path> classpath = new ArrayList<>();
  90         private List<String> output = null;
  91
  92         public Compilation() throws IOException {
  93             dir = Files.createTempDirectory("javac");
  94             srcdir = dir.resolve("src");
  95             outdir = dir.resolve("out");
  96             Files.createDirectory(srcdir);
  97             Files.createDirectory(outdir);
  98         }
  99
 100         public void add(Path p) {
 101             infiles.add(p);
 102         }
 103
 104         public void classpath(Path p) {
 105             classpath.add(p);
 106         }
 107
 108         public boolean compile() throws IOException {
 109             List<String> args = new ArrayList<>();
 110             args.add("javac");
 111             args.add("-d");
 112             args.add(outdir.toString());
 113             if(!classpath.isEmpty()) {
 114                 StringBuilder buf = new StringBuilder();
 115                 for(Path cp : classpath) {
 116                     if(buf.length() > 0)
 117                         buf.append(":");
 118                     buf.append(cp.toString());
 119                 }
 120                 args.add("-cp");
 121                 args.add(buf.toString());
 122             }
 123             for(Path p : infiles)
 124                 args.add(p.toString());
 125             ProcessBuilder cmd = new ProcessBuilder(args);
 126             cmd.redirectErrorStream(true);
 127             cmd.redirectOutput(ProcessBuilder.Redirect.PIPE);
 128             Process proc = cmd.start();
 129             List<String> output = new ArrayList<>();
 130             BufferedReader fp = new BufferedReader(new InputStreamReader(proc.getInputStream(), Utils.UTF8));
 131             while(true) {
 132                 String ln = fp.readLine();
 133                 if(ln == null)
 134                     break;
 135                 output.add(ln);
 136             }
 137             int status;
 138             try {
 139                 status = proc.waitFor();
 140             } catch(InterruptedException e) {
 141                 Thread.currentThread().interrupt();
 142                 throw(new IOException("compilation interrupted"));
 143             }
 144             this.output = output;
 145             return(status == 0);
 146         }
 147
 148         public List<String> output() {
 149             if(output == null)
 150                 throw(new IllegalStateException());
 151             return(output);
 152         }
 153
 154         public Collection<ClassOutput> classes() throws IOException {
 155             Collection<ClassOutput> ret = new ArrayList<>();
 156             for(Path p : (Iterable<Path>)Files.walk(outdir)::iterator) {
 157                 Path rel = outdir.relativize(p);
 158                 String fn = rel.getName(rel.getNameCount() - 1).toString();
 159                 if(!Files.isRegularFile(p) || !fn.endsWith(".class"))
 160                     continue;
 161                 StringBuilder clnm = new StringBuilder();
 162                 for(int i = 0; i < rel.getNameCount() - 1; i++) {
 163                     clnm.append(rel.getName(i));
 164                     clnm.append('.');
 165                 }
 166                 clnm.append(fn.substring(0, fn.length() - 6));
 167                 ClassOutput cls = new ClassOutput(clnm.toString());
 168                 Files.copy(p, cls.buf);
 169                 ret.add(cls);
 170             }
 171             return(ret);
 172         }
 173
 174         private static void remove(Path p) throws IOException {
 175             if(Files.isDirectory(p)) {
 176                 for(Path ent : (Iterable<Path>)Files.list(p)::iterator)
 177                     remove(ent);
 178             }
 179             Files.delete(p);
 180         }
 181
 182         public void close() throws IOException {
 183             remove(dir);
 184         }
 185     }
 186
 187     public static class BufferedClassLoader extends ClassLoader {
 188         public final Map<String, byte[]> contents;
 189
 190         public BufferedClassLoader(ClassLoader parent, Collection<ClassOutput> contents) {
 191             super(parent);
 192             this.contents = new HashMap<>();
 193             for(ClassOutput clc : contents)
 194                 this.contents.put(clc.name, clc.buf.toByteArray());
 195         }
 196
 197         public Class<?> findClass(String name) throws ClassNotFoundException {
 198             byte[] c = contents.get(name);
 199             if(c == null)
 200                 throw(new ClassNotFoundException(name));
 201             return(defineClass(name, c, 0, c.length));
 202         }
 203     }
 204
 205     public static class LibClassLoader extends ClassLoader {
 206         private final ClassLoader[] classpath;
 207
 208         public LibClassLoader(ClassLoader parent, Collection<ClassLoader> classpath) {
 209             super(parent);
 210             this.classpath = classpath.toArray(new ClassLoader[0]);
 211         }
 212
 213         public Class<?> findClass(String name) throws ClassNotFoundException {
 214             for(ClassLoader lib : classpath) {
 215                 try {
 216                     return(lib.loadClass(name));
 217                 } catch(ClassNotFoundException e) {}
 218             }
 219             throw(new ClassNotFoundException("Could not find " + name + " in any of " + Arrays.asList(classpath).toString()));
 220         }
 221     }
 222
 223     public ClassLoader libloader(Path p) {
 224         synchronized(libs) {
 225             ClassLoader ret = libs.get(p);
 226             if(ret == null) {
 227                 try {
 228                     libs.put(p, ret = new URLClassLoader(new URL[] {p.toUri().toURL()}));
 229                 } catch(MalformedURLException e) {
 230                     throw(new RuntimeException(e));
 231                 }
 232             }
 233             return(ret);
 234         }
 235     }
 236
 237     private Path findlib(String nm) {
 238         for(Path dir : searchpath) {
 239             Path jar = dir.resolve(nm + ".jar");
 240             if(Files.isRegularFile(jar))
 241                 return(jar);
 242         }
 243         return(null);
 244     }
 245
 246     private static final Pattern classpat = Pattern.compile("^((public|abstract)\\s+)*(class|interface)\\s+(\\S+)");
 247     private static final Pattern libpat = Pattern.compile("\\$use\\s*:\\s*(\\S+)");
 248     public class Module {
 249         public final Path file;
 250         public final ClassLoader code;
 251         public final Collection<Path> classpath = new ArrayList<>();
 252
 253         public Module(Path file) throws IOException {
 254             this.file = file;
 255             try(Compilation c = new Compilation()) {
 256                 split(c);
 257                 for(Path cp : classpath)
 258                     c.classpath(cp);
 259                 if(!c.compile())
 260                     throw(new CompilationException(file, c.output()));
 261                 ClassLoader parent = Compiler.class.getClassLoader();
 262                 if(!classpath.isEmpty()) {
 263                     Collection<ClassLoader> libs = new ArrayList<>();
 264                     for(Path cp : classpath)
 265                         libs.add(libloader(cp));
 266                     parent = new LibClassLoader(parent, libs);
 267                 }
 268                 code = new BufferedClassLoader(parent, c.classes());
 269             }
 270         }
 271
 272         public void split(Compilation c) throws IOException {
 273             StringBuilder head = new StringBuilder();
 274             BufferedWriter cur = null;
 275             try(BufferedReader fp = Files.newBufferedReader(file)) {
 276                 for(String ln = fp.readLine(); ln != null; ln = fp.readLine()) {
 277                     Matcher m = libpat.matcher(ln);
 278                     if(m.find()) {
 279                         Path lib = findlib(m.group(1));
 280                         if(lib == null)
 281                             throw(new CompilationException(file, Arrays.asList("no such library: " + m.group(1))));
 282                         classpath.add(lib);
 283                     }
 284                     m = classpat.matcher(ln);
 285                     if(m.find()) {
 286                         String clnm = m.group(4);
 287                         Path sp = c.srcdir.resolve(clnm + ".java");
 288                         c.add(sp);
 289                         if(cur != null)
 290                             cur.close();
 291                         cur = Files.newBufferedWriter(sp);
 292                         cur.append(head);
 293                     }
 294                     if(cur != null) {
 295                         cur.append(ln); cur.append('\n');
 296                     } else {
 297                         head.append(ln); head.append('\n');
 298                     }
 299                 }
 300             } finally {
 301                 if(cur != null)
 302                     cur.close();
 303             }
 304         }
 305     }
 306
 307     public class File {
 308         public final Path name;
 309         private FileTime mtime = null;
 310         private Module mod = null;
 311
 312         private File(Path name) {
 313             this.name = name;
 314         }
 315
 316         public void update() throws IOException {
 317             synchronized(this) {
 318                 FileTime mtime = Files.getLastModifiedTime(name);
 319                 if((this.mtime == null) || (this.mtime.compareTo(mtime) < 0)) {
 320                     mod = new Module(name);
 321                     this.mtime = mtime;
 322                 }
 323             }
 324         }
 325
 326         public Module mod() {
 327             if(mod == null)
 328                 throw(new RuntimeException("file has not yet been updated"));
 329             return(mod);
 330         }
 331     }
 332
 333     public File file(Path name) {
 334         synchronized(files) {
 335             File ret = files.get(name);
 336             if(ret == null)
 337                 files.put(name, ret = new File(name));
 338             return(ret);
 339         }
 340     }
 341
 342     private static Compiler global = null;
 343     public static Compiler get() {
 344         if(global == null) {
 345             synchronized(Compiler.class) {
 346                 if(global == null)
 347                     global = new Compiler();
 348             }
 349         }
 350         return(global);
 351     }
 352 }