org.armedbear.lisp.LogicalPathname Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of abcl Show documentation
Show all versions of abcl Show documentation
Common Lisp implementation running on the JVM
/*
* LogicalPathname.java
*
* Copyright (C) 2004-2005 Peter Graves
* $Id$
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* As a special exception, the copyright holders of this library give you
* permission to link this library with independent modules to produce an
* executable, regardless of the license terms of these independent
* modules, and to copy and distribute the resulting executable under
* terms of your choice, provided that you also meet, for each linked
* independent module, the terms and conditions of the license of that
* module. An independent module is a module which is not derived from
* or based on this library. If you modify this library, you may extend
* this exception to your version of the library, but you are not
* obligated to do so. If you do not wish to do so, delete this
* exception statement from your version.
*/
package org.armedbear.lisp;
import static org.armedbear.lisp.Lisp.*;
import java.util.HashMap;
import java.util.StringTokenizer;
public final class LogicalPathname extends Pathname
{
private static final String LOGICAL_PATHNAME_CHARS =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-;*.";
private static final HashMap map = new HashMap();
protected LogicalPathname()
{
}
protected LogicalPathname(Pathname p) {
super(p);
}
public LogicalPathname(String host, String rest)
{
final int limit = rest.length();
for (int i = 0; i < limit; i++) {
char c = rest.charAt(i);
if (LOGICAL_PATHNAME_CHARS.indexOf(c) < 0) {
error(new ParseError("The character #\\" + c + " is not valid in a logical pathname."));
return;
}
}
this.host = new SimpleString(host);
// "The device component of a logical pathname is always :UNSPECIFIC;
// no other component of a logical pathname can be :UNSPECIFIC."
device = Keyword.UNSPECIFIC;
int semi = rest.lastIndexOf(';');
if (semi >= 0) {
// Directory.
String d = rest.substring(0, semi + 1);
directory = parseDirectory(d);
rest = rest.substring(semi + 1);
} else {
// "If a relative-directory-marker precedes the directories, the
// directory component parsed is as relative; otherwise, the
// directory component is parsed as absolute."
directory = new Cons(Keyword.ABSOLUTE);
}
int dot = rest.indexOf('.');
if (dot >= 0) {
String n = rest.substring(0, dot);
if (n.equals("*"))
name = Keyword.WILD;
else
name = new SimpleString(n.toUpperCase());
rest = rest.substring(dot + 1);
dot = rest.indexOf('.');
if (dot >= 0) {
String t = rest.substring(0, dot);
if (t.equals("*"))
type = Keyword.WILD;
else
type = new SimpleString(t.toUpperCase());
// What's left is the version.
String v = rest.substring(dot + 1);
if (v.equals("*"))
version = Keyword.WILD;
else if (v.equals("NEWEST") || v.equals("newest"))
version = Keyword.NEWEST;
else
version = PACKAGE_CL.intern("PARSE-INTEGER").execute(new SimpleString(v));
} else {
String t = rest;
if (t.equals("*"))
type = Keyword.WILD;
else
type = new SimpleString(t.toUpperCase());
}
} else {
String n = rest;
if (n.equals("*"))
name = Keyword.WILD;
else if (n.length() > 0)
name = new SimpleString(n.toUpperCase());
}
}
private static final String LOGICAL_PATHNAME_COMPONENT_CHARS =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-";
public static final SimpleString canonicalizeStringComponent(AbstractString s)
{
final int limit = s.length();
for (int i = 0; i < limit; i++) {
char c = s.charAt(i);
if (LOGICAL_PATHNAME_COMPONENT_CHARS.indexOf(c) < 0) {
error(new ParseError("Invalid character #\\" + c +
" in logical pathname component \"" + s +
'"'));
// Not reached.
return null;
}
}
return new SimpleString(s.getStringValue().toUpperCase());
}
public static Pathname translateLogicalPathname(LogicalPathname pathname)
{
return (Pathname) Symbol.TRANSLATE_LOGICAL_PATHNAME.execute(pathname);
}
private static final LispObject parseDirectory(String s)
{
LispObject result;
if (s.charAt(0) == ';') {
result = new Cons(Keyword.RELATIVE);
s = s.substring(1);
} else
result = new Cons(Keyword.ABSOLUTE);
StringTokenizer st = new StringTokenizer(s, ";");
while (st.hasMoreTokens()) {
String token = st.nextToken();
LispObject obj;
if (token.equals("*"))
obj = Keyword.WILD;
else if (token.equals("**"))
obj = Keyword.WILD_INFERIORS;
else if (token.equals("..")) {
if (result.car() instanceof AbstractString) {
result = result.cdr();
continue;
}
obj= Keyword.UP;
} else
obj = new SimpleString(token.toUpperCase());
result = new Cons(obj, result);
}
return result.nreverse();
}
@Override
public LispObject typeOf()
{
return Symbol.LOGICAL_PATHNAME;
}
@Override
public LispObject classOf()
{
return BuiltInClass.LOGICAL_PATHNAME;
}
@Override
public LispObject typep(LispObject type)
{
if (type == Symbol.LOGICAL_PATHNAME)
return T;
if (type == BuiltInClass.LOGICAL_PATHNAME)
return T;
return super.typep(type);
}
@Override
protected String getDirectoryNamestring()
{
StringBuilder sb = new StringBuilder();
// "If a pathname is converted to a namestring, the symbols NIL and
// :UNSPECIFIC cause the field to be treated as if it were empty. That
// is, both NIL and :UNSPECIFIC cause the component not to appear in
// the namestring." 19.2.2.2.3.1
if (directory != NIL) {
LispObject temp = directory;
LispObject part = temp.car();
if (part == Keyword.ABSOLUTE) {
} else if (part == Keyword.RELATIVE)
sb.append(';');
else
error(new FileError("Unsupported directory component " + part.princToString() + ".",
this));
temp = temp.cdr();
while (temp != NIL) {
part = temp.car();
if (part instanceof AbstractString)
sb.append(part.getStringValue());
else if (part == Keyword.WILD)
sb.append('*');
else if (part == Keyword.WILD_INFERIORS)
sb.append("**");
else if (part == Keyword.UP)
sb.append("..");
else
error(new FileError("Unsupported directory component " + part.princToString() + ".",
this));
sb.append(';');
temp = temp.cdr();
}
}
return sb.toString();
}
@Override
public String printObject()
{
final LispThread thread = LispThread.currentThread();
boolean printReadably = (Symbol.PRINT_READABLY.symbolValue(thread) != NIL);
boolean printEscape = (Symbol.PRINT_ESCAPE.symbolValue(thread) != NIL);
StringBuilder sb = new StringBuilder();
if (printReadably || printEscape)
sb.append("#P\"");
sb.append(host.getStringValue());
sb.append(':');
if (directory != NIL)
sb.append(getDirectoryNamestring());
if (name != NIL) {
if (name == Keyword.WILD)
sb.append('*');
else
sb.append(name.getStringValue());
}
if (type != NIL) {
sb.append('.');
if (type == Keyword.WILD)
sb.append('*');
else
sb.append(type.getStringValue());
}
if (version.integerp()) {
sb.append('.');
int base = Fixnum.getValue(Symbol.PRINT_BASE.symbolValue(thread));
if (version instanceof Fixnum)
sb.append(Integer.toString(((Fixnum)version).value, base).toUpperCase());
else if (version instanceof Bignum)
sb.append(((Bignum)version).value.toString(base).toUpperCase());
} else if (version == Keyword.WILD) {
sb.append(".*");
} else if (version == Keyword.NEWEST) {
sb.append(".NEWEST");
}
if (printReadably || printEscape)
sb.append('"');
return sb.toString();
}
// ### canonicalize-logical-host host => canonical-host
private static final Primitive CANONICALIZE_LOGICAL_HOST = new canonicalize_logical_host();
private static class canonicalize_logical_host extends Primitive {
canonicalize_logical_host() {
super("canonicalize-logical-host", PACKAGE_SYS, true, "host");
}
@Override
public LispObject execute(LispObject arg)
{
AbstractString s = checkString(arg);
if (s.length() == 0) {
// "The null string, "", is not a valid value for any
// component of a logical pathname." 19.3.2.2
return error(new LispError("Invalid logical host name: \"" +
s.getStringValue() + '"'));
}
return canonicalizeStringComponent(s);
}
}
// ### %make-logical-pathname namestring => logical-pathname
private static final Primitive _MAKE_LOGICAL_PATHNAME = new _make_logical_pathname();
private static class _make_logical_pathname extends Primitive {
_make_logical_pathname() {
super("%make-logical-pathname", PACKAGE_SYS, true, "namestring");
}
@Override
public LispObject execute(LispObject arg)
{
// Check for a logical pathname host.
String s = arg.getStringValue();
String h = getHostString(s);
if (h != null) {
if (h.length() == 0) {
// "The null string, "", is not a valid value for any
// component of a logical pathname." 19.3.2.2
return error(new LispError("Invalid logical host name: \"" +
h + '"'));
}
if (Pathname.LOGICAL_PATHNAME_TRANSLATIONS.get(new SimpleString(h)) != null) {
// A defined logical pathname host.
return new LogicalPathname(h, s.substring(s.indexOf(':') + 1));
}
}
return error(new TypeError("Logical namestring does not specify a host: \"" + s + '"'));
}
}
public long getLastModified() {
Pathname p = translateLogicalPathname(this);
return p.getLastModified();
}
}