From: Fredrik Tolf <fredrik@dolda2000.com>
Date: Thu, 9 Nov 2023 19:33:46 +0000 (+0100)
Subject: Add classpath management to jagidir compiler.
X-Git-Url: http://dolda2000.com/gitweb/?p=jagi.git;a=commitdiff_plain;h=2be6677a7e36d486834ae804d5db08aaea7e32a6

Add classpath management to jagidir compiler.
---

diff --git a/src/jagi/fs/Compiler.java b/src/jagi/fs/Compiler.java
index 14b3786..e7a66a1 100644
--- a/src/jagi/fs/Compiler.java
+++ b/src/jagi/fs/Compiler.java
@@ -6,9 +6,47 @@ import java.util.regex.*;
 import java.nio.file.*;
 import java.nio.file.attribute.*;
 import java.io.*;
+import java.net.*;
 
 public class Compiler {
     private final Map<Path, File> files = new HashMap<>();
+    private final Map<Path, ClassLoader> libs = new HashMap<>();
+    private final Collection<Path> searchpath = new ArrayList<>();
+
+    public Compiler() {
+	String syspath = System.getenv("PATH");
+	if(syspath != null) {
+	    String sep = java.io.File.pathSeparator;
+	    int p1 = 0, p2 = syspath.indexOf(sep);
+	    do {
+		String el;
+		if(p2 >= 0) {
+		    el = syspath.substring(p1, p2);
+		    p1 = p2 + sep.length();
+		    p2 = syspath.indexOf(sep, p1);
+		} else {
+		    el =syspath.substring(p1);
+		}
+		try {
+		    Path p = Paths.get(el);
+		    if(p.getParent() != null)
+			searchpath.add(p.getParent().resolve("share").resolve("java"));
+		} catch(InvalidPathException e) {
+		    continue;
+		}
+	    } while(p2 >= 0);
+	}
+	String proppath = System.getProperty("jagi.search-path");
+	if(proppath != null) {
+	    for(String el : proppath.split(":")) {
+		try {
+		    searchpath.add(Paths.get(el));
+		} catch(InvalidPathException e) {
+		    continue;
+		}
+	    }
+	}
+    }
 
     public static class ClassOutput {
 	public final String name;
@@ -46,8 +84,9 @@ public class Compiler {
     }
 
     public static class Compilation implements AutoCloseable {
-	private final Path dir, srcdir, outdir;
+	public final Path dir, srcdir, outdir;
 	private final List<Path> infiles = new ArrayList<>();
+	private final List<Path> classpath = new ArrayList<>();
 	private List<String> output = null;
 
 	public Compilation() throws IOException {
@@ -62,11 +101,25 @@ public class Compiler {
 	    infiles.add(p);
 	}
 
+	public void classpath(Path p) {
+	    classpath.add(p);
+	}
+
 	public boolean compile() throws IOException {
 	    List<String> args = new ArrayList<>();
 	    args.add("javac");
 	    args.add("-d");
 	    args.add(outdir.toString());
+	    if(!classpath.isEmpty()) {
+		StringBuilder buf = new StringBuilder();
+		for(Path cp : classpath) {
+		    if(buf.length() > 0)
+			buf.append(":");
+		    buf.append(cp.toString());
+		}
+		args.add("-cp");
+		args.add(buf.toString());
+	    }
 	    for(Path p : infiles)
 		args.add(p.toString());
 	    ProcessBuilder cmd = new ProcessBuilder(args);
@@ -134,7 +187,8 @@ public class Compiler {
     public static class BufferedClassLoader extends ClassLoader {
 	public final Map<String, byte[]> contents;
 
-	public BufferedClassLoader(Collection<ClassOutput> contents) {
+	public BufferedClassLoader(ClassLoader parent, Collection<ClassOutput> contents) {
+	    super(parent);
 	    this.contents = new HashMap<>();
 	    for(ClassOutput clc : contents)
 		this.contents.put(clc.name, clc.buf.toByteArray());
@@ -148,27 +202,86 @@ public class Compiler {
 	}
     }
 
-    public static class Module {
+    public static class LibClassLoader extends ClassLoader {
+	private final ClassLoader[] classpath;
+
+	public LibClassLoader(ClassLoader parent, Collection<ClassLoader> classpath) {
+	    super(parent);
+	    this.classpath = classpath.toArray(new ClassLoader[0]);
+	}
+
+	public Class<?> findClass(String name) throws ClassNotFoundException {
+	    for(ClassLoader lib : classpath) {
+		try {
+		    return(lib.loadClass(name));
+		} catch(ClassNotFoundException e) {}
+	    }
+	    throw(new ClassNotFoundException("Could not find " + name + " in any of " + Arrays.asList(classpath).toString()));
+	}
+    }
+
+    public ClassLoader libloader(Path p) {
+	synchronized(libs) {
+	    ClassLoader ret = libs.get(p);
+	    if(ret == null) {
+		try {
+		    libs.put(p, ret = new URLClassLoader(new URL[] {p.toUri().toURL()}));
+		} catch(MalformedURLException e) {
+		    throw(new RuntimeException(e));
+		}
+	    }
+	    return(ret);
+	}
+    }
+
+    private Path findlib(String nm) {
+	for(Path dir : searchpath) {
+	    Path jar = dir.resolve(nm + ".jar");
+	    if(Files.isRegularFile(jar))
+		return(jar);
+	}
+	return(null);
+    }
+
+    private static final Pattern classpat = Pattern.compile("^((public|abstract)\\s+)*(class|interface)\\s+(\\S+)");
+    private static final Pattern libpat = Pattern.compile("\\$use\\s*:\\s*(\\S+)");
+    public class Module {
 	public final Path file;
 	public final ClassLoader code;
+	public final Collection<Path> classpath = new ArrayList<>();
 
 	public Module(Path file) throws IOException {
 	    this.file = file;
 	    try(Compilation c = new Compilation()) {
 		split(c);
+		for(Path cp : classpath)
+		    c.classpath(cp);
 		if(!c.compile())
 		    throw(new CompilationException(file, c.output()));
-		code = new BufferedClassLoader(c.classes());
+		ClassLoader parent = Compiler.class.getClassLoader();
+		if(!classpath.isEmpty()) {
+		    Collection<ClassLoader> libs = new ArrayList<>();
+		    for(Path cp : classpath)
+			libs.add(libloader(cp));
+		    parent = new LibClassLoader(parent, libs);
+		}
+		code = new BufferedClassLoader(parent, c.classes());
 	    }
 	}
 
-	private static final Pattern classpat = Pattern.compile("^((public|abstract)\\s+)*(class|interface)\\s+(\\S+)");
 	public void split(Compilation c) throws IOException {
 	    StringBuilder head = new StringBuilder();
 	    BufferedWriter cur = null;
 	    try(BufferedReader fp = Files.newBufferedReader(file)) {
 		for(String ln = fp.readLine(); ln != null; ln = fp.readLine()) {
-		    Matcher m = classpat.matcher(ln);
+		    Matcher m = libpat.matcher(ln);
+		    if(m.find()) {
+			Path lib = findlib(m.group(1));
+			if(lib == null)
+			    throw(new CompilationException(file, Arrays.asList("no such library: " + m.group(1))));
+			classpath.add(lib);
+		    }
+		    m = classpat.matcher(ln);
 		    if(m.find()) {
 			String clnm = m.group(4);
 			Path sp = c.srcdir.resolve(clnm + ".java");
@@ -191,7 +304,7 @@ public class Compiler {
 	}
     }
 
-    public static class File {
+    public class File {
 	public final Path name;
 	private FileTime mtime = null;
 	private Module mod = null;