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pathname.cc
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pathname.cc
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/*
File: pathname.cc
*/
/*
Copyright (c) 2014, Christian E. Schafmeister
CLASP is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
See directory 'clasp/licenses' for full details.
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
*/
/* -^- */
/*
pathname.cc -- Pathnames.
*/
/*
Copyright (c) 1984, Taiichi Yuasa and Masami Hagiya.
Copyright (c) 1990, Giuseppe Attardi.
Copyright (c) 2001, Juan Jose Garcia Ripoll.
Copyright (c) 2013, Christian E. Schafmeister - translated into C++
ECL is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
See file '../Copyright' for full details.
BRCL is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
*/
/*
O.S. DEPENDENT
This file contains those functions that interpret namestrings.
*/
#include <clasp/core/foundation.h>
#include <clasp/core/object.h>
#include <clasp/core/symbolTable.h>
#include <clasp/core/fileSystem.h>
#include <clasp/core/array.h>
#include <clasp/core/evaluator.h>
#include <clasp/core/designators.h>
#include <clasp/core/hashTable.h>
#include <clasp/core/hashTableEqualp.h>
#include <clasp/core/sequence.h>
#include <clasp/core/primitives.h>
#include <clasp/core/lispStream.h>
#include <clasp/core/arguments.h>
#include <clasp/core/character.h>
#include <clasp/core/lispList.h>
#include <clasp/core/pathname.h>
#include <clasp/core/wrappers.h>
SYMBOL_EXPORT_SC_(KeywordPkg, case);
SYMBOL_EXPORT_SC_(KeywordPkg, file);
SYMBOL_EXPORT_SC_(KeywordPkg, unspecific);
SYMBOL_EXPORT_SC_(KeywordPkg, local);
SYMBOL_EXPORT_SC_(KeywordPkg, common);
SYMBOL_EXPORT_SC_(KeywordPkg, wild_inferiors);
SYMBOL_EXPORT_SC_(KeywordPkg, up);
SYMBOL_EXPORT_SC_(KeywordPkg, wild);
SYMBOL_EXPORT_SC_(KeywordPkg, host);
SYMBOL_EXPORT_SC_(KeywordPkg, device);
SYMBOL_EXPORT_SC_(KeywordPkg, type);
SYMBOL_EXPORT_SC_(KeywordPkg, newest);
SYMBOL_EXPORT_SC_(KeywordPkg, version);
SYMBOL_EXPORT_SC_(KeywordPkg, directory);
namespace core {
typedef int (*delim_fn)(int);
/*
* Translates a string into the host's preferred case.
* See CLHS 19.2.2.1.2.2 Common Case in Pathname Components.
*/
/* We use UN*X conventions, so lower case is default.
* However, this really should be conditionalised to the OS type,
* and it should translate to _opposite_ of the local case.
*/
static T_sp coerce_to_from_pathname(T_sp x, T_sp host);
static T_sp normalize_case(T_sp path, T_sp cas) {
if (cas == kw::_sym_local) {
if (core__logical_pathname_p(path))
return kw::_sym_upcase;
return kw::_sym_downcase;
} else if (cas == kw::_sym_common || cas == kw::_sym_downcase || cas == kw::_sym_upcase) {
return cas;
} else {
SIMPLE_ERROR("Not a valid pathname case :\n{}", _rep_(cas));
}
}
static bool in_local_case_p(T_sp str, T_sp cas) {
if (cas == kw::_sym_downcase)
return clasp_string_case(gc::As<String_sp>(str)) < 0;
return true;
}
static bool in_antilocal_case_p(T_sp str, T_sp cas) {
if (cas == kw::_sym_downcase)
return clasp_string_case(gc::As<String_sp>(str)) > 0;
return false;
}
static T_sp to_local_case(T_sp str, T_sp cas) {
if (cas == kw::_sym_downcase)
return cl__string_downcase(str);
return cl__string_upcase(str);
}
static Symbol_sp host_case(T_sp host) {
if (host.nilp())
return kw::_sym_local;
if (core__logical_host_p(host))
return kw::_sym_upcase;
return kw::_sym_downcase;
}
static T_sp to_antilocal_case(T_sp str, T_sp cas) {
if (cas == kw::_sym_downcase)
return cl__string_upcase(str);
return cl__string_upcase(str);
}
static T_sp translate_from_common(T_sp tstr, T_sp tocase) {
String_sp str = gc::As<String_sp>(tstr);
int string_case = clasp_string_case(str);
if (string_case > 0) { /* ALL_UPPER */
return to_local_case(str, tocase);
} else if (string_case < 0) { /* ALL_LOWER */
return to_antilocal_case(str, tocase);
} else { /* Mixed case goes unchanged */
return str;
}
}
static T_sp translate_to_common(T_sp str, T_sp fromcase) {
if (in_local_case_p(str, fromcase)) {
return cl__string_upcase(str);
} else if (in_antilocal_case_p(str, fromcase)) {
return cl__string_downcase(str);
} else {
return str;
}
}
static T_sp translate_component_case(T_sp str, T_sp fromcase, T_sp tocase) {
/* Pathnames may contain some other objects, such as symbols,
* numbers, etc, which need not be translated */
if (str.nilp()) {
return str;
} else if (!gc::IsA<String_sp>(str)) {
#ifdef CLASP_UNICODE
if (core__extended_string_p(str) && core__fits_in_base_string(str)) {
str = coerce::coerce_to_base_string(str);
return translate_component_case(str, fromcase, tocase);
}
#endif
return str;
} else if (tocase == fromcase) {
return str;
} else if (tocase == kw::_sym_common) {
return translate_to_common(str, fromcase);
} else if (fromcase == kw::_sym_common) {
return translate_from_common(str, tocase);
} else {
str = translate_to_common(str, fromcase);
return translate_from_common(str, tocase);
}
}
static T_sp translate_list_case(List_sp list, T_sp fromcase, T_sp tocase) {
/* If the argument is really a list, translate all strings in it and
* return this new list, else assume it is a string and translate it.
*/
if (!(list).consp()) {
return translate_component_case(list, fromcase, tocase);
} else {
list = cl__copy_list(list);
for (auto l : list) {
/* It is safe to pass anything to translate_component_case,
* because it will only transform strings, leaving other
* object (such as symbols) unchanged.*/
T_sp name = oCar(l);
name = cl__listp(name) ? translate_list_case(name, fromcase, tocase) : translate_component_case(name, fromcase, tocase);
l->rplaca(name);
}
return list;
}
}
static T_sp destructively_check_directory(List_sp directory, bool logical, bool delete_back) {
/* This function performs two tasks
* 1) It ensures that the list is a valid directory list
* 2) It ensures that all strings in the list are valid C strings without fill pointer
* All strings are copied, thus avoiding problems with the user modifying the
* list that was passed to MAKE-PATHNAME.
* 3) Redundant :back are removed.
*/
/* INV: directory is always a list */
if (!cl__listp(directory)) {
// printf("%s:%d %s error\n", __FILE__, __LINE__, __FUNCTION__ );
return kw::_sym_error;
}
if (directory.nilp())
return directory;
if (oCar(directory) != kw::_sym_absolute && oCar(directory) != kw::_sym_relative) {
// printf("%s:%d %s error\n", __FILE__, __LINE__, __FUNCTION__ );
return kw::_sym_error;
}
BEGIN:
T_sp ptr;
int i;
for (i = 0, ptr = directory; ptr.consp(); ptr = oCdr(ptr), ++i) {
T_sp item = oCar(ptr);
if (item == kw::_sym_back) {
if (i == 0) {
// printf("%s:%d %s error\n", __FILE__, __LINE__, __FUNCTION__ );
return kw::_sym_error;
}
item = cl__nth(clasp_make_integer(i - 1), directory);
if (item == kw::_sym_absolute || item == kw::_sym_wild_inferiors) {
// printf("%s:%d %s error\n", __FILE__, __LINE__, __FUNCTION__ );
return kw::_sym_error;
}
if (delete_back && i >= 2) {
T_sp next = oCdr(ptr);
ptr = cl__nthcdr(clasp_make_integer(i - 2), directory);
gc::As<Cons_sp>(ptr)->rplacd(next);
i = i - 2; // Was i--;
}
} else if (item == kw::_sym_up) {
if (i == 0) {
// printf("%s:%d %s error\n", __FILE__, __LINE__, __FUNCTION__ );
return kw::_sym_error;
}
item = cl__nth(clasp_make_integer(i - 1), directory);
if (item == kw::_sym_absolute || item == kw::_sym_wild_inferiors) {
// printf("%s:%d %s error\n", __FILE__, __LINE__, __FUNCTION__ );
return kw::_sym_error;
}
} else if (item == kw::_sym_relative || item == kw::_sym_absolute) {
if (i > 0) {
// printf("%s:%d %s error\n", __FILE__, __LINE__, __FUNCTION__ );
return kw::_sym_error;
}
} else if (cl__stringp(item)) {
String_sp sitem = gc::As_unsafe<String_sp>(item);
size_t l = cl__length(sitem);
if (core__fits_in_base_string(sitem)) {
sitem = gc::As_unsafe<SimpleBaseString_sp>(core__copy_to_simple_base_string(sitem));
} else
sitem = gc::As_unsafe<String_sp>(cl__copy_seq(sitem));
gc::As<Cons_sp>(ptr)->rplaca(sitem);
if (logical)
continue;
if (l && cl__char(sitem, 0).unsafe_character() == '.') {
if (l == 1) {
/* Single dot */
if (i == 0) {
// printf("%s:%d %s error\n", __FILE__, __LINE__, __FUNCTION__ );
return kw::_sym_error;
}
gc::As<Cons_sp>(cl__nthcdr(clasp_make_integer(--i), directory))->rplacd(oCdr(ptr));
} else if (l == 2 && cl__char(sitem, 1).unsafe_character() == '.') {
gc::As<Cons_sp>(ptr)->rplaca(kw::_sym_up);
goto BEGIN;
}
}
} else if (item != kw::_sym_wild && item != kw::_sym_wild_inferiors) {
// printf("%s:%d %s error\n", __FILE__, __LINE__, __FUNCTION__ );
return kw::_sym_error;
}
}
return directory;
}
Pathname_sp Pathname_O::makePathname(T_sp host, T_sp device, T_sp directory, T_sp name, T_sp type, T_sp version, T_sp fromcase,
bool logical) {
T_sp x, component;
// printf("%s:%d:%s directory->%s\n", __FILE__, __LINE__, __FUNCTION__, _rep_(directory).c_str());
Pathname_sp p;
if (logical) {
p = LogicalPathname_O::create();
} else {
if (cl__stringp(host)) {
if (core__logical_host_p(host)) {
p = LogicalPathname_O::create();
logical = true;
} else {
p = Pathname_O::create();
}
} else if (host.nilp()) {
p = Pathname_O::create();
} else {
x = directory;
component = kw::_sym_host;
goto ERROR;
}
}
if (device.notnilp() && device != kw::_sym_unspecific && !(!core__logical_pathname_p(p) && cl__stringp(device))) {
x = device;
component = kw::_sym_device;
goto ERROR;
}
if (name.notnilp() && name != kw::_sym_wild && !cl__stringp(name)) {
x = name;
component = kw::_sym_name;
goto ERROR;
}
if (type.notnilp() && type != kw::_sym_unspecific && type != kw::_sym_wild && !cl__stringp(type)) {
x = type;
component = kw::_sym_type;
goto ERROR;
}
if (version != kw::_sym_unspecific && version != kw::_sym_newest && version != kw::_sym_wild && version.notnilp() &&
!core__fixnump(version)) {
x = version;
component = kw::_sym_version;
ERROR : { SIMPLE_ERROR("{} is not a valid pathname-{} component", _rep_(x), _rep_(component)); }
}
if (directory.nilp()) {
// do nothing
#ifdef CLASP_UNICODE
} else if (gc::IsA<String_sp>(directory)) {
directory = lisp_createList(kw::_sym_absolute, directory);
#endif
} else if (cl__stringp(directory)) {
directory = Cons_O::createList(kw::_sym_absolute, directory);
} else if (Symbol_sp sdirectory = directory.asOrNull<Symbol_O>()) {
if (sdirectory == kw::_sym_wild) {
directory = lisp_createList(kw::_sym_absolute, kw::_sym_wild_inferiors);
} else {
x = sdirectory;
component = kw::_sym_directory;
goto ERROR;
}
} else if (Cons_sp cdirectory = directory.asOrNull<Cons_O>()) {
directory = cl__copy_list(cdirectory);
} else {
x = directory;
component = kw::_sym_directory;
goto ERROR;
}
p->_Host = host;
{
T_sp tocase = normalize_case(p, kw::_sym_local);
if (core__logical_pathname_p(p))
fromcase = kw::_sym_common;
else
fromcase = normalize_case(p, fromcase);
p->_Host = translate_component_case(host, fromcase, tocase);
p->_Device = translate_component_case(device, fromcase, tocase);
directory = translate_list_case(directory, fromcase, tocase); // .as<List_O>()
p->_Directory = directory;
p->_Name = translate_component_case(name, fromcase, tocase);
p->_Type = translate_component_case(type, fromcase, tocase);
p->_Version = version;
}
// List_sp directory_copy = cl__copy_list(directory);
directory = destructively_check_directory(directory, core__logical_pathname_p(p), 0);
unlikely_if(directory == kw::_sym_error) {
eval::funcall(cl::_sym_error, cl::_sym_fileError, kw::_sym_pathname, p);
// cl__error(3, @'file-error', kw::_sym_pathname, p);
}
p->_Directory = directory;
// printf("%s:%d:%s result->%s\n", __FILE__, __LINE__, __FUNCTION__, _rep_(p).c_str());
return (p);
}
bool Pathname_O::equal(T_sp obj) const {
if (obj.nilp())
return false;
if (Pathname_sp other = obj.asOrNull<Pathname_O>()) {
if (!cl__equal(this->_Host, other->_Host))
return false;
if (!cl__equal(this->_Device, other->_Device))
return false;
if (!cl__equal(this->_Directory, other->_Directory))
return false;
if (!cl__equal(this->_Name, other->_Name))
return false;
if (!cl__equal(this->_Type, other->_Type))
return false;
#if 0
if (!cl__equal(this->_Version, other->_Version))
return false;
#endif
return true;
}
return false;
}
void Pathname_O::sxhash_(HashGenerator& hg) const {
if (hg.isFilling())
hg.hashObject(this->_Host);
if (hg.isFilling())
hg.hashObject(this->_Device);
if (hg.isFilling())
hg.hashObject(this->_Directory);
if (hg.isFilling())
hg.hashObject(this->_Name);
if (hg.isFilling())
hg.hashObject(this->_Type);
if (hg.isFilling())
hg.hashObject(this->_Version);
}
void Pathname_O::sxhash_equal(HashGenerator& hg) const {
if (hg.isFilling())
HashTable_O::sxhash_equal(hg, this->_Host);
if (hg.isFilling())
HashTable_O::sxhash_equal(hg, this->_Device);
if (hg.isFilling())
HashTable_O::sxhash_equal(hg, this->_Directory);
if (hg.isFilling())
HashTable_O::sxhash_equal(hg, this->_Name);
if (hg.isFilling())
HashTable_O::sxhash_equal(hg, this->_Type);
if (hg.isFilling())
HashTable_O::sxhash_equal(hg, this->_Version);
}
void Pathname_O::sxhash_equalp(HashGenerator& hg) const {
if (hg.isFilling())
HashTable_O::sxhash_equalp(hg, this->_Host);
if (hg.isFilling())
HashTable_O::sxhash_equalp(hg, this->_Device);
if (hg.isFilling())
HashTable_O::sxhash_equalp(hg, this->_Directory);
if (hg.isFilling())
HashTable_O::sxhash_equalp(hg, this->_Name);
if (hg.isFilling())
HashTable_O::sxhash_equalp(hg, this->_Type);
if (hg.isFilling())
HashTable_O::sxhash_equalp(hg, this->_Version);
}
Pathname_sp Pathname_O::tilde_expand(Pathname_sp pathname) {
/*
* If the pathname is a physical one, without hostname, without device
* and the first element is either a tilde '~' or '~' followed by
* a user name, we merge the user homedir pathname with this one.
*/
T_sp directory, head;
if (core__logical_pathname_p(pathname) || pathname->_Host.notnilp() || pathname->_Device.notnilp()) {
return pathname;
}
directory = pathname->_Directory;
if (!(directory).consp() || cons_car(directory) != kw::_sym_relative || cons_car(directory).nilp()) {
return pathname;
}
head = oCadr(directory);
if (cl__stringp(head) && cl__length(head) > 0 && cl__char(gc::As_unsafe<String_sp>(head), 0).unsafe_character() == '~') {
/* Remove the tilde component */
gc::As<Cons_sp>(directory)->rplacd(oCddr(directory));
pathname = cl__merge_pathnames(pathname, homedirPathname(head), kw::_sym_default);
}
return pathname;
}
#define WORD_INCLUDE_DELIM 1
#define WORD_ALLOW_ASTERISK 2
#define WORD_EMPTY_IS_NIL 4
#define WORD_LOGICAL 8
#define WORD_SEARCH_LAST_DOT 16
#define WORD_ALLOW_LEADING_DOT 32
#define WORD_DISALLOW_SLASH 64
#define WORD_DISALLOW_SEMICOLON 128
static T_sp make_one(T_sp s, size_t start, size_t end) { return cl__subseq(s, start, make_fixnum(end)); }
static int is_colon(int c) { return c == ':'; }
static int is_slash(int c) { return IS_DIR_SEPARATOR(c); }
static int is_semicolon(int c) { return c == ';'; }
static int is_dot(int c) { return c == '.'; }
static int is_null(int c) { return c == '\0'; }
/*
* Parses a word from string `S' until either:
* 1) character `DELIM' is found
* 2) end of string is reached
* 3) a non valid character is found
* Output is either
* 1) :error in case (3) above
* 2) :wild, :wild-inferiors, :up
* 3) "" or _Nil<T_O>() when word has no elements
* 5) A non empty string
*/
static T_sp parse_word(T_sp st, delim_fn delim, int flags, size_t start, size_t end, size_t* end_of_word) {
size_t i, j, last_delim = end;
bool wild_inferiors = false;
String_sp ss = gc::As<String_sp>(st);
i = j = start;
for (; i < end; i++) {
bool valid_char;
size_t c = cl__char(ss, i).unsafe_character();
if (delim(c)) {
if ((i == start) && (flags & WORD_ALLOW_LEADING_DOT)) {
/* Leading dot is included */
continue;
}
last_delim = i;
if (!(flags & WORD_SEARCH_LAST_DOT)) {
break;
}
}
if (c == '*') {
if (!(flags & WORD_ALLOW_ASTERISK))
valid_char = false; /* Asterisks not allowed in this word */
else {
wild_inferiors = (i > start && cl__char(ss, i - 1).unsafe_character() == '*');
valid_char = true; /* single "*" */
}
} else if (c == ';' && (flags & WORD_DISALLOW_SEMICOLON)) {
valid_char = 0;
} else if (c == '/' && (flags & WORD_DISALLOW_SLASH)) {
valid_char = 0;
} else {
valid_char = c != 0;
}
if (!valid_char) {
*end_of_word = start;
return kw::_sym_error;
}
}
if (i > last_delim) {
/* Go back to the position of the last delimiter */
i = last_delim;
}
if (i < end) {
*end_of_word = i + 1;
} else {
*end_of_word = end;
/* We have reached the end of the string without finding
the proper delimiter */
if (flags & WORD_INCLUDE_DELIM) {
*end_of_word = start;
return nil<T_O>();
}
}
switch (i - j) {
case 0:
if (flags & WORD_EMPTY_IS_NIL)
return nil<T_O>();
return SimpleBaseString_O::make(""); // cl_core.null_string;
case 1:
if (cl__char(ss, j).unsafe_character() == '*')
return kw::_sym_wild;
break;
case 2: {
size_t c0 = cl__char(ss, j).unsafe_character();
size_t c1 = cl__char(ss, j + 1).unsafe_character();
if (c0 == '*' && c1 == '*')
return kw::_sym_wild_inferiors;
if (!(flags & WORD_LOGICAL) && c0 == '.' && c1 == '.')
return kw::_sym_up;
break;
}
default:
if (wild_inferiors) /* '**' surrounded by other characters */
return kw::_sym_error;
}
return make_one(ss, j, i);
}
/*
* Parses a logical or physical directory tree. Output is always a
* list of valid directory components, which may be just NIL.
*
* INV: When parsing of directory components has failed, a valid list
* is also returned, and it will be later in the parsing of
* pathname-name or pathname-type when the same error is detected.
*/
static T_sp parse_directories(T_sp s, int flags, size_t start, size_t end, size_t* end_of_dir) {
size_t i, j;
List_sp path = nil<T_O>();
delim_fn delim = (flags & WORD_LOGICAL) ? is_semicolon : is_slash;
flags |= WORD_INCLUDE_DELIM | WORD_ALLOW_ASTERISK;
*end_of_dir = start;
for (i = j = start; i < end; j = i) {
T_sp part = parse_word(s, delim, flags, j, end, &i);
if (part == kw::_sym_error || part.nilp())
break;
if (cl__stringp(part)) {
if (cl__length(part) == 0) { /* "/", ";" */
if (j != start) {
if (flags & WORD_LOGICAL)
return kw::_sym_error;
*end_of_dir = i;
continue;
}
part = (flags & WORD_LOGICAL) ? kw::_sym_relative : kw::_sym_absolute;
}
}
*end_of_dir = i;
path = Cons_O::create(part, path);
}
return cl__nreverse(path);
}
CL_DOCSTRING(R"dx(Returns the host's list of translations. Each translation is a list of at least
two elements: from-wildcard and to-wildcard. From-wildcard is a logical
pathname whose host is host. To-wildcard is a pathname.)dx")
CL_DEFUN List_sp cl__logical_pathname_translations(String_sp host) {
KeyValuePair* pair = _lisp->pathnameTranslations_()->find(host);
if (!pair) // This type error should be (satisfies logical-host-p)
TYPE_ERROR(host, cl::_sym_string);
return pair->_Value;
}
CL_LISPIFY_NAME("cl:logical-pathname-translations");
CL_DOCSTRING(R"dx(Sets a logical pathname host's list of translations. If host is a string that has
not been previously used as a logical pathname host, a new logical
pathname host is defined; otherwise an existing host's translations are
replaced. logical pathname host names are compared with string-equal.)dx")
CL_DEFUN_SETF T_sp cl__setf_logical_pathname_translations(List_sp translations, String_sp host) {
if (translations.nilp()) {
_lisp->pathnameTranslations_()->remhash(host);
} else {
List_sp coerced_translations = nil<T_O>();
host = cl__string_upcase(host);
_lisp->pathnameTranslations_()->setf_gethash(host, coerced_translations);
while (translations.notnilp()) {
coerced_translations =
Cons_O::create(Cons_O::createList(coerce_to_from_pathname(oCaar(translations), host), cl__pathname(oCadar(translations))),
coerced_translations);
translations = CDR(translations);
}
_lisp->pathnameTranslations_()->setf_gethash(host, cl__nreverse(coerced_translations));
}
return translations;
}
CL_DOCSTRING("Returns true if host is a logical hostname; otherwise returns false.");
CL_DEFUN bool core__logical_host_p(T_sp host) { return cl__stringp(host) && _lisp->pathnameTranslations_()->contains(host); }
CL_DOCSTRING("list-all-logical-hosts returns a fresh list of all logical hosts.");
CL_DEFUN T_sp core__list_all_logical_hosts() { return _lisp->pathnameTranslations_()->keysAsCons(); }
/*
* Parses a lisp namestring until the whole substring is parsed or an
* error is found. It returns a valid pathname or NIL, plus the place
* where parsing ended in *END_OF_PARSING.
*
* The rules are as follows:
*
* 1) If a hostname is supplied it determines whether the namestring
* will be parsed as logical or as physical.
*
* 2) If no hostname is supplied, first it tries parsing using logical
* pathname rules and, if no logical hostname is found, then it
* tries the physical pathname format.
*
* 3) Logical pathname syntax:
* [logical-hostname:][;][logical-directory-component;][pathname-name][.pathname-type]
*
* 4) Physical pathname syntax:
* [device:][[//hostname]/][directory-component/]*[pathname-name][.pathname-type]
*
* logical-hostname, device, hostname = word
* logical-directory-component = word | wildcard-word
* directory-component = word | wildcard-word | '..' | '.'
* pathname-name, pathname-type = word | wildcard-word | ""
*
*/
Pathname_sp clasp_parseNamestring(T_sp s, size_t start, size_t end, size_t* ep, T_sp default_host) {
T_sp host, device, path, name, type, aux, version;
bool logical = false;
if (start == end) {
host = device = path = name = type = aux = version = nil<T_O>();
logical = false;
goto make_it;
}
/* We first try parsing as logical-pathname. In case of
* failure, physical-pathname parsing is performed only when
* there is no supplied *logical* host name. All other failures
* result in _Nil<T_O>() as output.
*/
host = parse_word(s, is_colon, WORD_LOGICAL | WORD_INCLUDE_DELIM | WORD_DISALLOW_SEMICOLON, start, end, ep);
if (default_host.notnilp()) {
if (host.nilp() || host == kw::_sym_error)
host = default_host;
}
if (!core__logical_host_p(host))
goto physical;
/*
* Logical pathname format:
* [logical-hostname:][;][logical-directory-component;][pathname-name][.pathname-type]
*/
logical = true;
device = kw::_sym_unspecific;
path = parse_directories(s, WORD_LOGICAL, *ep, end, ep);
if ((path).consp()) {
if (cons_car(path) != kw::_sym_relative && cons_car(path) != kw::_sym_absolute)
path = Cons_O::create(kw::_sym_absolute, path);
path = destructively_check_directory(path, true, false);
} else {
path = Cons_O::create(kw::_sym_absolute, path);
}
if (path == kw::_sym_error)
return nil<Pathname_O>();
name = parse_word(s, is_dot, WORD_LOGICAL | WORD_ALLOW_ASTERISK | WORD_EMPTY_IS_NIL, *ep, end, ep);
if (name == kw::_sym_error)
return nil<Pathname_O>();
type = nil<T_O>();
version = nil<T_O>();
if (*ep == start || cl__char(gc::As<String_sp>(s), *ep - 1).unsafe_character() != '.')
goto make_it;
type = parse_word(s, is_dot, WORD_LOGICAL | WORD_ALLOW_ASTERISK | WORD_EMPTY_IS_NIL, *ep, end, ep);
if (type == kw::_sym_error)
return nil<Pathname_O>();
if (*ep == start || cl__char(gc::As<String_sp>(s), *ep - 1).unsafe_character() != '.')
goto make_it;
aux = parse_word(s, is_null, WORD_LOGICAL | WORD_ALLOW_ASTERISK | WORD_EMPTY_IS_NIL, *ep, end, ep);
if (aux == kw::_sym_error) {
return nil<Pathname_O>();
} else if (cl__symbolp(aux)) {
version = aux;
} else {
T_mv version_mv = cl__parse_integer(gc::As<String_sp>(aux), 0, nil<T_O>(), 10, _lisp->_true());
T_sp tversion = version_mv;
MultipleValues& mvn = core::lisp_multipleValues();
Fixnum_sp parsed_length = gc::As<Fixnum_sp>(mvn.valueGet(1, version_mv.number_of_values()));
if (unbox_fixnum(parsed_length) == cl__length(aux) && cl__integerp(tversion) && clasp_plusp(gc::As<Integer_sp>(tversion))) {
version = gc::As<Integer_sp>(tversion);
} else if (cl__string_equal(aux, kw::_sym_newest).notnilp()) {
version = kw::_sym_newest;
} else {
return nil<Pathname_O>();
}
}
goto make_it;
physical:
/*
* Physical pathname format:
* [[device:[//hostname]]/][directory-component/]*[pathname-name][.pathname-type]
*/
logical = false;
/* We only parse a hostname when the device was present. This
* requisite is a bit stupid and only applies to the Unix port,
* where "//home/" is equivalent to "/home" However, in Windows
* we need "//FOO/" to be separately handled, for it is a shared
* resource.
*/
#if defined(CLASP_MS_WINDOWS_HOST)
if ((start + 1 <= end) && is_slash(cl__char(s, start))) {
device = nil<T_O>();
goto maybe_parse_host;
}
#endif
device = parse_word(s, is_colon, WORD_INCLUDE_DELIM | WORD_EMPTY_IS_NIL | WORD_DISALLOW_SLASH, start, end, ep);
if (device == kw::_sym_error || device.nilp()) {
device = nil<T_O>();
host = nil<T_O>();
goto done_device_and_host;
}
if (!cl__stringp(device)) {
return nil<Pathname_O>();
}
#if defined(CLASP_MS_WINDOWS_HOST)
maybe_parse_host:
#endif
/* Files have no effective device. */
if (cl__string_equal(device, kw::_sym_file).notnilp())
device = nil<T_O>();
start = *ep;
host = nil<T_O>();
if ((start + 2) <= end && is_slash(cl__char(gc::As<String_sp>(s), start).unsafe_character()) &&
is_slash(cl__char(gc::As<String_sp>(s), start + 1).unsafe_character())) {
host = parse_word(s, is_slash, WORD_EMPTY_IS_NIL, start + 2, end, ep);
if (host == kw::_sym_error) {
host = nil<T_O>();
} else if (host.notnilp()) {
if (!cl__stringp(host))
return nil<Pathname_O>();
start = *ep;
if (is_slash(cl__char(gc::As<String_sp>(s), --start).unsafe_character()))
*ep = start;
}
}
if (cl__length(device) == 0)
device = nil<T_O>();
done_device_and_host:
path = parse_directories(s, 0, *ep, end, ep);
if ((path).consp()) {
if (cons_car(path) != kw::_sym_relative && cons_car(path) != kw::_sym_absolute)
path = Cons_O::create(kw::_sym_relative, path);
path = destructively_check_directory(path, false, false);
}
if (path == kw::_sym_error)
return nil<Pathname_O>();
start = *ep;
name = parse_word(s, is_dot, WORD_ALLOW_LEADING_DOT | WORD_SEARCH_LAST_DOT | WORD_ALLOW_ASTERISK | WORD_EMPTY_IS_NIL, start, end,
ep);
if (name == kw::_sym_error)
return nil<Pathname_O>();
if ((*ep - start) <= 1 || cl__char(gc::As<String_sp>(s), *ep - 1).unsafe_character() != '.') {
type = nil<T_O>();
} else {
type = parse_word(s, is_null, WORD_ALLOW_ASTERISK, *ep, end, ep);
if (type == kw::_sym_error)
return nil<Pathname_O>();
}
version = (name.notnilp() || type.notnilp()) ? kw::_sym_newest : nil<Symbol_O>();
make_it:
if (*ep >= end)
*ep = end;
Pathname_sp newpath = Pathname_O::makePathname(host, device, path, name, type, version, kw::_sym_local, logical);
ASSERTF(core__logical_pathname_p(newpath) == logical,
"The Class of path({}) does not match what is specified by logical({}) - it must match", _rep_(newpath), logical);
return Pathname_O::tilde_expand(newpath);
}
SYMBOL_SC_(CorePkg, defaultPathnameDefaults);
DOCGROUP(clasp);
CL_DEFUN Pathname_sp core__safe_default_pathname_defaults(void) {
/* This routine returns the value of *default-pathname-defaults*
* coerced to type PATHNAME. Special care is taken so that we do
* not enter an infinite loop when using PARSE-NAMESTRING, because
* this routine might itself try to use the value of this variable. */
T_sp path = cl__symbol_value(cl::_sym_STARdefaultPathnameDefaultsSTAR);
unlikely_if(!cl__pathnamep(path)) {
cl::_sym_STARdefaultPathnameDefaultsSTAR->setf_symbolValue(Pathname_O::create());
#if 0
// Set *default-pathname-defaults* to a pathname to avoid infinite recursions of errors
DynamicScopeManager scope(cl::_sym_STARdefaultPathnameDefaultsSTAR, Pathname_O::create());
ERROR_WRONG_TYPE_KEY_ARG(core::_sym_defaultPathnameDefaults, cl::_sym_STARdefaultPathnameDefaultsSTAR, path, cl::_sym_Pathname_O);
#endif
}
return gc::As<Pathname_sp>(path);
}
DOCGROUP(clasp);
CL_DEFUN Pathname_sp core__safe_default_pathname_defaults_host_only(void) {
/* This routine returns a pathname that has value of only the host part of *default-pathname-defaults* */
Pathname_sp def = core__safe_default_pathname_defaults();
Pathname_sp res = Pathname_O::makePathname(cl__pathname_host(def, kw::_sym_local), nil<core::T_O>(), // device
nil<core::T_O>(), // dir
nil<core::T_O>(), // name
nil<core::T_O>(), // type
nil<core::T_O>(), // version
kw::_sym_local, // fromcase
false);
return res;
}
static std::atomic<size_t> global_pathname_recursion_guard;
struct PathnameRecursionGuard {
PathnameRecursionGuard() {
++global_pathname_recursion_guard;
if (global_pathname_recursion_guard > 500) {
printf("%s:%d Hit maximum recursion on pathname - set breakpoint here\n", __FILE__, __LINE__);
}
}
virtual ~PathnameRecursionGuard() { --global_pathname_recursion_guard; }
};
// This function is exposed to CL because it is needed to implement
// the generic version of CL:PATHNAME. It will be unexported by
// streams.lisp.
CL_DEFUN Pathname_sp gray__PERCENTpathname(T_sp x) {
PathnameRecursionGuard guard;
if (x.nilp()) {
ERROR_WRONG_TYPE_ONLY_ARG(cl::_sym_pathname, x,
Cons_O::createList(cl::_sym_or, cl::_sym_fileStream, cl::_sym_string, cl::_sym_pathname));
}
if (gc::IsA<Pathname_sp>(x))
return gc::As<Pathname_sp>(x);
if (cl__stringp(x))
return gc::As<Pathname_sp>(cl__parse_namestring(x));
if (stream_p(x)) {
T_sp pathname = stream_pathname(x);
if (cl__stringp(pathname))
pathname = cl__parse_namestring(pathname);
if (gc::IsA<Pathname_sp>(pathname))
return gc::As<Pathname_sp>(pathname);
}
ERROR_WRONG_TYPE_ONLY_ARG(
cl::_sym_pathname, x,
Cons_O::createList(cl::_sym_or, cl::_sym_fileStream, cl::_sym_string, cl::_sym_pathname, cl::_sym_SynonymStream_O));
}
CL_DOCSTRING(R"dx(Returns the pathname denoted by pathspec. If the gray-streams module has been loaded
then this function will be made generic.)dx")
DOCGROUP(clasp);
CL_DEFUN Pathname_sp cl__pathname(T_sp pathspec) { return gray__PERCENTpathname(pathspec); }
CL_LAMBDA(x);
CL_DECLARE();
CL_DOCSTRING(R"dx(logical-pathname converts pathspec to a logical pathname and returns the new logical pathname.)dx");
DOCGROUP(clasp);
CL_DEFUN T_sp cl__logical_pathname(T_sp x) {
if (x.nilp())
ERROR_WRONG_TYPE_ONLY_ARG(cl::_sym_logicalPathname, x,
Cons_O::createList(cl::_sym_or, cl::_sym_fileStream, cl::_sym_string, cl::_sym_pathname));
x = cl__pathname(x);
if (!core__logical_pathname_p(x)) {
cl__error(cl::_sym_simpleTypeError,
Cons_O::createList(kw::_sym_format_control, SimpleBaseString_O::make("~S cannot be coerced to a logical pathname."),
kw::_sym_format_arguments, Cons_O::createList(x), kw::_sym_expected_type,
cl::_sym_LogicalPathname_O, kw::_sym_datum, x));
}
return x;
}
Pathname_sp clasp_mergePathnames(T_sp tpath, T_sp tdefaults, T_sp defaultVersion) {
T_sp host, device, directory, name, type, version;
Symbol_sp tocase;
if (tdefaults.nilp())
TYPE_ERROR(tdefaults, Cons_O::createList(cl::_sym_or, cl::_sym_string, cl::_sym_Pathname_O));
Pathname_sp defaults = cl__pathname(tdefaults);
Pathname_sp path = gc::As<Pathname_sp>(cl__parse_namestring(tpath, nil<T_O>(), defaults));
host = path->_Host;
if (host.nilp())
host = defaults->_Host;
tocase = host_case(host);
if (path->_Device.nilp()) {
if (path->_Host.nilp())
device = cl__pathname_device(defaults, tocase);
else if (path->_Host == defaults->_Host)
device = defaults->_Device;
else
device = nil<T_O>(); // default_device(path->_Host);
} else {
device = path->_Device;
}
if (path->_Directory.nilp()) {
directory = cl__pathname_directory(defaults, tocase);
} else if (cons_car(path->_Directory) == kw::_sym_absolute) {
directory = path->_Directory;
} else if (defaults->_Directory.notnilp()) {
directory = Cons_O::append(cl__pathname_directory(defaults, tocase), oCdr(path->_Directory));
/* Eliminate redundant :back */
directory = destructively_check_directory(directory, true, true);
} else {
directory = path->_Directory;
}
name = path->_Name;
if (name.nilp()) {
name = cl__pathname_name(defaults, tocase);
}
type = path->_Type;
if (type.nilp()) {
type = cl__pathname_type(defaults, tocase);
}
version = path->_Version;
if (path->_Name.nilp()) {
if (version.nilp())
version = defaults->_Version;
}
if (version.nilp()) {
version = defaultVersion;
}
if (defaultVersion == kw::_sym_default) {
if (name.nilp() && type.nilp()) {
version = nil<T_O>();
} else {
version = kw::_sym_newest;
}
}
// In this implementation, version is not considered
defaults = Pathname_O::makePathname(host, device, directory, name, type, version, tocase);
return defaults;