03a671e7861b545a64d04ea06a8e3ba661104182
1 # This file is part of NIT ( http://www.nitlanguage.org ).
3 # Copyright 2004-2008 Jean Privat <jean@pryen.org>
4 # Copyright 2008 Floréal Morandat <morandat@lirmm.fr>
5 # Copyright 2008 Jean-Sébastien Gélinas <calestar@gmail.com>
7 # This file is free software, which comes along with NIT. This software is
8 # distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
9 # without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
10 # PARTICULAR PURPOSE. You can modify it is you want, provided this header
11 # is kept unaltered, and a notification of the changes is added.
12 # You are allowed to redistribute it and sell it, alone or is a part of
15 # File manipulations (create, read, write, etc.)
19 intrude import text
::ropes
27 #include <sys/types.h>
35 # `Stream` used to interact with a File or FileDescriptor
36 abstract class FileStream
38 # The path of the file.
39 var path
: nullable String = null
42 private var file
: nullable NativeFile = null
44 # The status of a file. see POSIX stat(2).
46 # var f = new FileReader.open("/etc/issue")
47 # assert f.file_stat.is_file
49 # Return null in case of error
50 fun file_stat
: nullable FileStat
52 var stat
= _file
.file_stat
53 if stat
.address_is_null
then return null
54 return new FileStat(stat
)
57 # File descriptor of this file
58 fun fd
: Int do return _file
.fileno
62 if _file
== null then return
63 if _file
.address_is_null
then
64 if last_error
!= null then return
65 last_error
= new IOError("Cannot close unopened file")
68 var i
= _file
.io_close
70 last_error
= new IOError("Close failed due to error {sys.errno.strerror}")
75 # Sets the buffering mode for the current FileStream
77 # If the buf_size is <= 0, its value will be 512 by default
79 # The mode is any of the buffer_mode enumeration in `Sys`:
81 # * `buffer_mode_full`
82 # * `buffer_mode_line`
83 # * `buffer_mode_none`
84 fun set_buffering_mode
(buf_size
, mode
: Int) do
85 if buf_size
<= 0 then buf_size
= 512
86 if _file
.set_buffering_type
(buf_size
, mode
) != 0 then
87 last_error
= new IOError("Error while changing buffering type for FileStream, returned error {sys.errno.strerror}")
92 # `Stream` that can read from a File
99 # Open the same file again.
100 # The original path is reused, therefore the reopened file can be a different file.
102 # var f = new FileReader.open("/etc/issue")
103 # var l = f.read_line
105 # assert l == f.read_line
108 if not eof
and not _file
.address_is_null
then close
110 _file
= new NativeFile.io_open_read
(path
.to_cstring
)
111 if _file
.address_is_null
then
112 last_error
= new IOError("Error: Opening file at '{path.as(not null)}' failed with '{sys.errno.strerror}'")
127 redef fun fill_buffer
129 var nb
= _file
.io_read
(_buffer
, _buffer_capacity
)
139 redef var end_reached
= false
141 # Open the file at `path` for reading.
143 # var f = new FileReader.open("/etc/issue")
144 # assert not f.end_reached
147 # In case of error, `last_error` is set
149 # f = new FileReader.open("/fail/does not/exist")
150 # assert f.end_reached
151 # assert f.last_error != null
152 init open
(path
: String)
156 _file
= new NativeFile.io_open_read
(path
.to_cstring
)
157 if _file
.address_is_null
then
158 last_error
= new IOError("Error: Opening file at '{path}' failed with '{sys.errno.strerror}'")
163 # Creates a new File stream from a file descriptor
165 # This is a low-level method.
166 init from_fd
(fd
: Int) do
169 _file
= fd
.fd_to_stream
(read_only
)
170 if _file
.address_is_null
then
171 last_error
= new IOError("Error: Converting fd {fd} to stream failed with '{sys.errno.strerror}'")
177 # `Stream` that can write to a File
182 redef fun write_bytes
(s
) do
183 if last_error
!= null then return
184 if not _is_writable
then
185 last_error
= new IOError("cannot write to non-writable stream")
188 write_native
(s
.items
, 0, s
.length
)
193 if last_error
!= null then return
194 if not _is_writable
then
195 last_error
= new IOError("cannot write to non-writable stream")
198 s
.write_native_to
(self)
201 redef fun write_byte
(value
)
203 if last_error
!= null then return
204 if not _is_writable
then
205 last_error
= new IOError("Cannot write to non-writable stream")
208 if _file
.address_is_null
then
209 last_error
= new IOError("Writing on a null stream")
214 var err
= _file
.write_byte
(value
)
217 last_error
= new IOError("Problem writing a byte: {err}")
226 redef var is_writable
= false
228 # Write `len` bytes from `native`.
229 private fun write_native
(native
: NativeString, from
, len
: Int)
231 if last_error
!= null then return
232 if not _is_writable
then
233 last_error
= new IOError("Cannot write to non-writable stream")
236 if _file
.address_is_null
then
237 last_error
= new IOError("Writing on a null stream")
241 var err
= _file
.io_write
(native
, from
, len
)
244 last_error
= new IOError("Problem in writing : {err} {len} \n")
248 # Open the file at `path` for writing.
249 init open
(path
: String)
251 _file
= new NativeFile.io_open_write
(path
.to_cstring
)
254 if _file
.address_is_null
then
255 last_error
= new IOError("Error: Opening file at '{path}' failed with '{sys.errno.strerror}'")
260 # Creates a new File stream from a file descriptor
261 init from_fd
(fd
: Int) do
263 _file
= fd
.fd_to_stream
(wipe_write
)
265 if _file
.address_is_null
then
266 last_error
= new IOError("Error: Opening stream from file descriptor {fd} failed with '{sys.errno.strerror}'")
273 # Creates a file stream from a file descriptor `fd` using the file access `mode`.
275 # NOTE: The `mode` specified must be compatible with the one used in the file descriptor.
276 private fun fd_to_stream
(mode
: NativeString): NativeFile `{
277 return fdopen(self, mode);
281 # Constant for read-only file streams
282 private fun read_only
: NativeString do return once
"r".to_cstring
284 # Constant for write-only file streams
286 # If a stream is opened on a file with this method,
287 # it will wipe the previous file if any.
288 # Else, it will create the file.
289 private fun wipe_write
: NativeString do return once
"w".to_cstring
291 ###############################################################################
293 # Standard input stream.
295 # The class of the default value of `sys.stdin`.
300 _file
= new NativeFile.native_stdin
306 struct pollfd fd = {0, POLLIN, 0};
307 int res = poll(&fd, 1, 0);
309 perror("Error poll stdin");
316 # Standard output stream.
318 # The class of the default value of `sys.stdout`.
322 _file
= new NativeFile.native_stdout
325 set_buffering_mode
(256, sys
.buffer_mode_line
)
329 # Standard error stream.
331 # The class of the default value of `sys.stderr`.
335 _file
= new NativeFile.native_stderr
341 ###############################################################################
344 # Like `write_to` but take care of creating the file
345 fun write_to_file
(filepath
: String)
347 var stream
= new FileWriter.open
(filepath
)
353 # Utility class to access file system services.
355 # Usually created with `Text::to_path`.
357 # `Path` objects does not necessarily represent existing files in a file system.
358 # They are sate-less objects that efficiently represent path information.
359 # They also provide an easy to use API on file-system services and are used to store their error status (see `last_error`)
362 private var path
: String
365 redef fun to_s
do return path
367 # Short name of the file at `to_s`
370 # var path = "/tmp/somefile".to_path
371 # assert path.filename == "somefile"
373 var filename
: String = path
.basename
is lazy
375 # Last error produced by I/O operations.
378 # var path = "/does/not/exists".to_path
379 # assert path.last_error == null
381 # assert path.last_error != null
384 # Since `Path` objects are stateless, `last_error` is reset on most operations and reflect its status.
385 var last_error
: nullable IOError = null is writable
387 # Does the file at `path` exists?
388 fun exists
: Bool do return stat
!= null
390 # Information on the file at `self` following symbolic links
392 # Returns `null` if there is no file at `self`.
394 # assert "/etc/".to_path.stat.is_dir
395 # assert "/etc/issue".to_path.stat.is_file
396 # assert "/fail/does not/exist".to_path.stat == null
399 # var p = "/tmp/".to_path
401 # if stat != null then # Does `p` exist?
402 # print "It's size is {stat.size}"
403 # if stat.is_dir then print "It's a directory"
406 fun stat
: nullable FileStat
408 var stat
= path
.to_cstring
.file_stat
409 if stat
.address_is_null
then return null
410 return new FileStat(stat
)
413 # Information on the file or link at `self`
415 # Do not follow symbolic links.
416 fun link_stat
: nullable FileStat
418 var stat
= path
.to_cstring
.file_lstat
419 if stat
.address_is_null
then return null
420 return new FileStat(stat
)
423 # Delete a file from the file system.
425 # `last_error` is updated to contains the error information on error, and null on success.
428 var res
= path
.to_cstring
.file_delete
430 last_error
= new IOError("Cannot delete `{path}`: {sys.errno.strerror}")
436 # Copy content of file at `path` to `dest`.
438 # `last_error` is updated to contains the error information on error, and null on success.
443 var output
= dest
.open_wo
445 while not input
.eof
do
446 var buffer
= input
.read
(1024)
452 last_error
= input
.last_error
or else output
.last_error
455 # Open this file for reading.
458 # var file = "/etc/issue".to_path.open_ro
459 # print file.read_line
463 # Note that it is the user's responsibility to close the stream.
464 # Therefore, for simple use case, look at `read_all` or `each_line`.
466 # ENSURE `last_error == result.last_error`
467 fun open_ro
: FileReader
469 var res
= new FileReader.open
(path
)
470 last_error
= res
.last_error
474 # Open this file for writing
477 # var file = "bla.log".to_path.open_wo
478 # file.write "Blabla\n"
482 # Note that it is the user's responsibility to close the stream.
483 # Therefore, for simple use case, look at `Writable::write_to_file`.
485 # ENSURE `last_error == result.last_error`
486 fun open_wo
: FileWriter
488 var res
= new FileWriter.open
(path
)
489 last_error
= res
.last_error
493 # Read all the content of the file as a string.
496 # var content = "/etc/issue".to_path.read_all
500 # `last_error` is updated to contains the error information on error, and null on success.
501 # In case of error, the result might be empty or truncated.
503 # See `Reader::read_all` for details.
504 fun read_all
: String do return read_all_bytes
.to_s
506 # Read all the content on the file as a raw sequence of bytes.
509 # var content = "/etc/issue".to_path.read_all_bytes
513 # `last_error` is updated to contains the error information on error, and null on success.
514 # In case of error, the result might be empty or truncated.
515 fun read_all_bytes
: Bytes
518 var res
= s
.read_all_bytes
520 last_error
= s
.last_error
524 # Read all the lines of the file
527 # var lines = "/etc/passwd".to_path.read_lines
529 # print "{lines.length} users"
532 # var fields = l.split(":")
533 # print "name={fields[0]} uid={fields[2]}"
537 # `last_error` is updated to contains the error information on error, and null on success.
538 # In case of error, the result might be empty or truncated.
540 # See `Reader::read_lines` for details.
541 fun read_lines
: Array[String]
544 var res
= s
.read_lines
546 last_error
= s
.last_error
550 # Return an iterator on each line of the file
553 # for l in "/etc/passwd".to_path.each_line do
554 # var fields = l.split(":")
555 # print "name={fields[0]} uid={fields[2]}"
559 # Note: the stream is automatically closed at the end of the file (see `LineIterator::close_on_finish`)
561 # `last_error` is updated to contains the error information on error, and null on success.
563 # See `Reader::each_line` for details.
564 fun each_line
: LineIterator
567 var res
= s
.each_line
568 res
.close_on_finish
= true
569 last_error
= s
.last_error
574 # Lists the files contained within the directory at `path`.
576 # var files = "/etc".to_path.files
577 # assert files.has("/etc/issue".to_path)
579 # `last_error` is updated to contains the error information on error, and null on success.
580 # In case of error, the result might be empty or truncated.
582 # var path = "/etc/issue".to_path
584 # assert files.is_empty
585 # assert path.last_error != null
586 fun files
: Array[Path]
589 var res
= new Array[Path]
590 var d
= new NativeDir.opendir
(path
.to_cstring
)
591 if d
.address_is_null
then
592 last_error
= new IOError("Cannot list directory `{path}`: {sys.errno.strerror}")
598 if de
.address_is_null
then
599 # readdir cannot fail, so null means end of list
602 var name
= de
.to_s_with_copy
603 if name
== "." or name
== ".." then continue
604 res
.add
new Path(path
/ name
)
611 # Delete a directory and all of its content
613 # Does not go through symbolic links and may get stuck in a cycle if there
614 # is a cycle in the file system.
616 # `last_error` is updated to contains the error information on error, and null on success.
617 # The method does not stop on the first error and try to remove most file and directories.
620 # var path = "/does/not/exists/".to_path
622 # assert path.last_error != null
627 for file
in self.files
do
628 var stat
= file
.link_stat
630 last_error
= file
.last_error
639 if last_error
== null then last_error
= file
.last_error
642 # Delete the directory itself if things are fine
643 if last_error
== null then
644 if path
.to_cstring
.rmdir
then
645 last_error
= new IOError("Cannot remove `{self}`: {sys.errno.strerror}")
650 redef fun ==(other
) do return other
isa Path and path
.simplify_path
== other
.path
.simplify_path
651 redef fun hash
do return path
.simplify_path
.hash
654 # Information on a file
656 # Created by `Path::stat` and `Path::link_stat`.
658 # The information within this class is gathered when the instance is initialized
659 # it will not be updated if the targeted file is modified.
665 # The low-level status of a file
668 private var stat
: NativeFileStat
670 private var finalized
= false
674 if not finalized
then
680 # Returns the last access time in seconds since Epoch
681 fun last_access_time
: Int
687 # Returns the last access time
689 # alias for `last_access_time`
690 fun atime
: Int do return last_access_time
692 # Returns the last modification time in seconds since Epoch
693 fun last_modification_time
: Int
699 # Returns the last modification time
701 # alias for `last_modification_time`
702 fun mtime
: Int do return last_modification_time
705 # Size of the file at `path`
712 # Is self a regular file and not a device file, pipe, socket, etc.?
719 # Alias for `is_file`
720 fun is_reg
: Bool do return is_file
722 # Is this a directory?
729 # Is this a symbolic link?
736 # FIXME Make the following POSIX only? or implement in some other way on Windows
738 # Returns the last status change time in seconds since Epoch
739 fun last_status_change_time
: Int
745 # Returns the last status change time
747 # alias for `last_status_change_time`
748 fun ctime
: Int do return last_status_change_time
750 # Returns the permission bits of file
757 # Is this a character device?
764 # Is this a block device?
771 # Is this a FIFO pipe?
778 # Is this a UNIX socket
787 # Access file system related services on the path at `self`
788 fun to_path
: Path do return new Path(to_s
)
790 private fun write_native_to
(s
: FileWriter)
792 for i
in substrings
do s
.write_native
(i
.to_cstring
, 0, i
.length
)
797 # return true if a file with this names exists
798 fun file_exists
: Bool do return to_cstring
.file_exists
800 # The status of a file. see POSIX stat(2).
801 fun file_stat
: nullable FileStat
803 var stat
= to_cstring
.file_stat
804 if stat
.address_is_null
then return null
805 return new FileStat(stat
)
808 # The status of a file or of a symlink. see POSIX lstat(2).
809 fun file_lstat
: nullable FileStat
811 var stat
= to_cstring
.file_lstat
812 if stat
.address_is_null
then return null
813 return new FileStat(stat
)
816 # Remove a file, return true if success
817 fun file_delete
: Bool do return to_cstring
.file_delete
819 # Copy content of file at `self` to `dest`
820 fun file_copy_to
(dest
: String) do to_path
.copy
(dest
.to_path
)
822 # Remove the trailing `extension`.
824 # `extension` usually starts with a dot but could be anything.
826 # assert "file.txt".strip_extension(".txt") == "file"
827 # assert "file.txt".strip_extension("le.txt") == "fi"
828 # assert "file.txt".strip_extension("xt") == "file.t"
830 # If `extension == null`, the rightmost extension is stripped, including the last dot.
832 # assert "file.txt".strip_extension == "file"
834 # If `extension` is not present, `self` is returned unmodified.
836 # assert "file.txt".strip_extension(".tar.gz") == "file.txt"
837 fun strip_extension
(extension
: nullable String): String
839 if extension
== null then
840 extension
= file_extension
841 if extension
== null then
843 else extension
= ".{extension}"
846 if has_suffix
(extension
) then
847 return substring
(0, length
- extension
.length
)
852 # Extract the basename of a path and strip the `extension`
854 # The extension is stripped only if `extension != null`.
856 # assert "/path/to/a_file.ext".basename(".ext") == "a_file"
857 # assert "path/to/a_file.ext".basename(".ext") == "a_file"
858 # assert "path/to/a_file.ext".basename == "a_file.ext"
859 # assert "path/to".basename(".ext") == "to"
860 # assert "path/to/".basename(".ext") == "to"
861 # assert "path/to".basename == "to"
862 # assert "path".basename("") == "path"
863 # assert "/path".basename("") == "path"
864 # assert "/".basename("") == "/"
865 # assert "".basename("") == ""
866 fun basename
(extension
: nullable String): String
868 var l
= length
- 1 # Index of the last char
869 while l
> 0 and self.chars
[l
] == '/' do l
-= 1 # remove all trailing `/`
870 if l
== 0 then return "/"
871 var pos
= chars
.last_index_of_from
('/', l
)
874 n
= substring
(pos
+1, l-pos
)
877 if extension
!= null then
878 return n
.strip_extension
(extension
)
882 # Extract the dirname of a path
884 # assert "/path/to/a_file.ext".dirname == "/path/to"
885 # assert "path/to/a_file.ext".dirname == "path/to"
886 # assert "path/to".dirname == "path"
887 # assert "path/to/".dirname == "path"
888 # assert "path".dirname == "."
889 # assert "/path".dirname == "/"
890 # assert "/".dirname == "/"
891 # assert "".dirname == "."
894 var l
= length
- 1 # Index of the last char
895 while l
> 0 and self.chars
[l
] == '/' do l
-= 1 # remove all trailing `/`
896 var pos
= chars
.last_index_of_from
('/', l
)
898 return substring
(0, pos
)
899 else if pos
== 0 then
906 # Return the canonicalized absolute pathname (see POSIX function `realpath`)
907 fun realpath
: String do
908 var cs
= to_cstring
.file_realpath
909 var res
= cs
.to_s_with_copy
910 # cs.free_malloc # FIXME memory leak
914 # Simplify a file path by remove useless `.`, removing `//`, and resolving `..`
916 # * `..` are not resolved if they start the path
917 # * starting `.` is simplified unless the path is empty
918 # * starting `/` is not removed
919 # * trailing `/` is removed
921 # Note that the method only work on the string:
923 # * no I/O access is performed
924 # * the validity of the path is not checked
927 # assert "some/./complex/../../path/from/../to/a////file//".simplify_path == "path/to/a/file"
928 # assert "../dir/file".simplify_path == "../dir/file"
929 # assert "dir/../../".simplify_path == ".."
930 # assert "dir/..".simplify_path == "."
931 # assert "//absolute//path/".simplify_path == "/absolute/path"
932 # assert "//absolute//../".simplify_path == "/"
933 # assert "/".simplify_path == "/"
934 # assert "../".simplify_path == ".."
935 # assert "./".simplify_path == "."
936 # assert "././././././".simplify_path == "."
937 # assert "./../dir".simplify_path == "../dir"
938 # assert "./dir".simplify_path == "dir"
940 fun simplify_path
: String
942 var a
= self.split_with
("/")
943 var a2
= new Array[String]
945 if x
== "." and not a2
.is_empty
then continue # skip `././`
946 if x
== "" and not a2
.is_empty
then continue # skip `//`
947 if x
== ".." and not a2
.is_empty
and a2
.last
!= ".." then
948 if a2
.last
== "." then # do not skip `./../`
949 a2
.pop
# reduce `./../` in `../`
950 else # reduce `dir/../` in `/`
954 else if not a2
.is_empty
and a2
.last
== "." then
955 a2
.pop
# reduce `./dir` in `dir`
959 if a2
.is_empty
then return "."
960 if a2
.length
== 1 and a2
.first
== "" then return "/"
964 # Correctly join two path using the directory separator.
966 # Using a standard "{self}/{path}" does not work in the following cases:
969 # * `path` starts with `'/'`.
971 # This method ensures that the join is valid.
973 # assert "hello".join_path("world") == "hello/world"
974 # assert "hel/lo".join_path("wor/ld") == "hel/lo/wor/ld"
975 # assert "".join_path("world") == "world"
976 # assert "hello".join_path("/world") == "/world"
977 # assert "hello/".join_path("world") == "hello/world"
978 # assert "hello/".join_path("/world") == "/world"
980 # Note: You may want to use `simplify_path` on the result.
982 # Note: This method works only with POSIX paths.
983 fun join_path
(path
: String): String
985 if path
.is_empty
then return self
986 if self.is_empty
then return path
987 if path
.chars
[0] == '/' then return path
988 if self.last
== '/' then return "{self}{path}"
989 return "{self}/{path}"
992 # Convert the path (`self`) to a program name.
994 # Ensure the path (`self`) will be treated as-is by POSIX shells when it is
995 # used as a program name. In order to do that, prepend `./` if needed.
997 # assert "foo".to_program_name == "./foo"
998 # assert "/foo".to_program_name == "/foo"
999 # assert "".to_program_name == "./" # At least, your shell will detect the error.
1000 fun to_program_name
: String do
1001 if self.has_prefix
("/") then
1008 # Alias for `join_path`
1010 # assert "hello" / "world" == "hello/world"
1011 # assert "hel/lo" / "wor/ld" == "hel/lo/wor/ld"
1012 # assert "" / "world" == "world"
1013 # assert "/hello" / "/world" == "/world"
1015 # This operator is quite useful for chaining changes of path.
1016 # The next one being relative to the previous one.
1020 # var c = "baz/foobar"
1021 # assert a/b/c == "/bar/baz/foobar"
1022 fun /(path
: String): String do return join_path
(path
)
1024 # Returns the relative path needed to go from `self` to `dest`.
1026 # assert "/foo/bar".relpath("/foo/baz") == "../baz"
1027 # assert "/foo/bar".relpath("/baz/bar") == "../../baz/bar"
1029 # If `self` or `dest` is relative, they are considered relatively to `getcwd`.
1031 # In some cases, the result is still independent of the current directory:
1033 # assert "foo/bar".relpath("..") == "../../.."
1035 # In other cases, parts of the current directory may be exhibited:
1037 # var p = "../foo/bar".relpath("baz")
1038 # var c = getcwd.basename
1039 # assert p == "../../{c}/baz"
1041 # For path resolution independent of the current directory (eg. for paths in URL),
1042 # or to use an other starting directory than the current directory,
1043 # just force absolute paths:
1045 # var start = "/a/b/c/d"
1046 # var p2 = (start/"../foo/bar").relpath(start/"baz")
1047 # assert p2 == "../../d/baz"
1050 # Neither `self` or `dest` has to be real paths or to exist in directories since
1051 # the resolution is only done with string manipulations and without any access to
1052 # the underlying file system.
1054 # If `self` and `dest` are the same directory, the empty string is returned:
1056 # assert "foo".relpath("foo") == ""
1057 # assert "foo/../bar".relpath("bar") == ""
1059 # The empty string and "." designate both the current directory:
1061 # assert "".relpath("foo/bar") == "foo/bar"
1062 # assert ".".relpath("foo/bar") == "foo/bar"
1063 # assert "foo/bar".relpath("") == "../.."
1064 # assert "/" + "/".relpath(".") == getcwd
1065 fun relpath
(dest
: String): String
1068 var from
= (cwd
/self).simplify_path
.split
("/")
1069 if from
.last
.is_empty
then from
.pop
# case for the root directory
1070 var to
= (cwd
/dest
).simplify_path
.split
("/")
1071 if to
.last
.is_empty
then to
.pop
# case for the root directory
1073 # Remove common prefixes
1074 while not from
.is_empty
and not to
.is_empty
and from
.first
== to
.first
do
1079 # Result is going up in `from` with ".." then going down following `to`
1080 var from_len
= from
.length
1081 if from_len
== 0 then return to
.join
("/")
1082 var up
= "../"*(from_len-1
) + ".."
1083 if to
.is_empty
then return up
1084 var res
= up
+ "/" + to
.join
("/")
1088 # Create a directory (and all intermediate directories if needed)
1090 # Return an error object in case of error.
1092 # assert "/etc/".mkdir != null
1093 fun mkdir
: nullable Error
1095 var dirs
= self.split_with
("/")
1096 var path
= new FlatBuffer
1097 if dirs
.is_empty
then return null
1098 if dirs
[0].is_empty
then
1099 # it was a starting /
1102 var error
: nullable Error = null
1104 if d
.is_empty
then continue
1107 var res
= path
.to_s
.to_cstring
.file_mkdir
1108 if not res
and error
== null then
1109 error
= new IOError("Cannot create directory `{path}`: {sys.errno.strerror}")
1115 # Delete a directory and all of its content, return `true` on success
1117 # Does not go through symbolic links and may get stuck in a cycle if there
1118 # is a cycle in the filesystem.
1120 # Return an error object in case of error.
1122 # assert "/fail/does not/exist".rmdir != null
1123 fun rmdir
: nullable Error
1130 # Change the current working directory
1133 # assert getcwd == "/etc"
1135 # assert getcwd == "/"
1137 # Return an error object in case of error.
1139 # assert "/etc".chdir == null
1140 # assert "/fail/does no/exist".chdir != null
1141 # assert getcwd == "/etc" # unchanger
1142 fun chdir
: nullable Error
1144 var res
= to_cstring
.file_chdir
1145 if res
then return null
1146 var error
= new IOError("Cannot change directory to `{self}`: {sys.errno.strerror}")
1150 # Return right-most extension (without the dot)
1152 # Only the last extension is returned.
1153 # There is no special case for combined extensions.
1155 # assert "file.txt".file_extension == "txt"
1156 # assert "file.tar.gz".file_extension == "gz"
1158 # For file without extension, `null` is returned.
1159 # Hoever, for trailing dot, `""` is returned.
1161 # assert "file".file_extension == null
1162 # assert "file.".file_extension == ""
1164 # The starting dot of hidden files is never considered.
1166 # assert ".file.txt".file_extension == "txt"
1167 # assert ".file".file_extension == null
1168 fun file_extension
: nullable String
1170 var last_slash
= chars
.last_index_of
('.')
1171 if last_slash
> 0 then
1172 return substring
( last_slash
+1, length
)
1178 # Returns entries contained within the directory represented by self.
1180 # var files = "/etc".files
1181 # assert files.has("issue")
1183 # Returns an empty array in case of error
1185 # files = "/etc/issue".files
1186 # assert files.is_empty
1188 # TODO find a better way to handle errors and to give them back to the user.
1189 fun files
: Array[String]
1191 var res
= new Array[String]
1192 var d
= new NativeDir.opendir
(to_cstring
)
1193 if d
.address_is_null
then return res
1197 if de
.address_is_null
then break
1198 var name
= de
.to_s_with_copy
1199 if name
== "." or name
== ".." then continue
1208 redef class FlatString
1209 redef fun write_native_to
(s
)
1211 s
.write_native
(items
, index_from
, length
)
1215 redef class NativeString
1216 private fun file_exists
: Bool `{
1217 FILE *hdl = fopen(self,"r");
1224 private fun file_stat
: NativeFileStat `{
1226 if(stat(self, &buff) != -1) {
1227 struct stat* stat_element;
1228 stat_element = malloc(sizeof(struct stat));
1229 return memcpy(stat_element, &buff, sizeof(struct stat));
1234 private fun file_lstat
: NativeFileStat `{
1235 struct stat* stat_element;
1237 stat_element = malloc(sizeof(struct stat));
1238 res = lstat(self, stat_element);
1239 if (res == -1) return NULL;
1240 return stat_element;
1243 private fun file_mkdir
: Bool `{ return !mkdir(self, 0777); `}
1245 private fun rmdir: Bool `{ return !rmdir(self); `}
1247 private fun file_delete
: Bool `{
1248 return remove(self) == 0;
1251 private fun file_chdir
: Bool `{ return !chdir(self); `}
1253 private fun file_realpath: NativeString `{ return realpath(self, NULL); `}
1256 # This class is system dependent ... must reify the vfs
1257 private extern class NativeFileStat `{ struct stat * `}
1259 # Returns the permission bits of file
1260 fun mode: Int `{ return self->st_mode; `}
1262 # Returns the last access time
1263 fun atime
: Int `{ return self->st_atime; `}
1265 # Returns the last status change time
1266 fun ctime: Int `{ return self->st_ctime; `}
1268 # Returns the last modification time
1269 fun mtime
: Int `{ return self->st_mtime; `}
1272 fun size: Int `{ return self->st_size; `}
1274 # Returns true if it is a regular file (not a device file, pipe, sockect, ...)
1275 fun is_reg
: Bool `{ return S_ISREG(self->st_mode); `}
1277 # Returns true if it is a directory
1278 fun is_dir: Bool `{ return S_ISDIR(self->st_mode); `}
1280 # Returns true if it is a character device
1281 fun is_chr
: Bool `{ return S_ISCHR(self->st_mode); `}
1283 # Returns true if it is a block device
1284 fun is_blk: Bool `{ return S_ISBLK(self->st_mode); `}
1286 # Returns true if the type is fifo
1287 fun is_fifo
: Bool `{ return S_ISFIFO(self->st_mode); `}
1289 # Returns true if the type is a link
1290 fun is_lnk: Bool `{ return S_ISLNK(self->st_mode); `}
1292 # Returns true if the type is a socket
1293 fun is_sock
: Bool `{ return S_ISSOCK(self->st_mode); `}
1296 # Instance of this class are standard FILE * pointers
1297 private extern class NativeFile `{ FILE* `}
1298 fun io_read
(buf
: NativeString, len
: Int): Int `{
1299 return fread(buf, 1, len, self);
1302 fun io_write
(buf
: NativeString, from
, len
: Int): Int `{
1303 return fwrite(buf+from, 1, len, self);
1306 fun write_byte
(value
: Byte): Int `{
1307 unsigned char b = (unsigned char)value;
1308 return fwrite(&b, 1, 1, self);
1311 fun io_close
: Int `{ return fclose(self); `}
1313 fun file_stat: NativeFileStat `{
1315 if(fstat
(fileno
(self), &buff
) != -1) {
1316 struct stat
* stat_element
;
1317 stat_element
= malloc
(sizeof
(struct stat
));
1318 return memcpy
(stat_element
, &buff
, sizeof
(struct stat
));
1323 fun fileno: Int `{ return fileno(self); `}
1325 # Flushes the buffer, forcing the write operation
1326 fun flush
: Int `{ return fflush(self); `}
1328 # Used to specify how the buffering will be handled for the current stream.
1329 fun set_buffering_type(buf_length: Int, mode: Int): Int `{
1330 return setvbuf
(self, NULL, mode
, buf_length
);
1333 new io_open_read(path: NativeString) `{ return fopen(path, "r"); `}
1335 new io_open_write
(path
: NativeString) `{ return fopen(path, "w"); `}
1337 new native_stdin `{ return stdin; `}
1339 new native_stdout
`{ return stdout; `}
1341 new native_stderr `{ return stderr; `}
1344 # Standard `DIR*` pointer
1345 private extern class NativeDir `{ DIR* `}
1348 new opendir(path: NativeString) `{ return opendir(path); `}
1351 fun closedir
`{ closedir(self); `}
1353 # Read the next directory entry
1354 fun readdir: NativeString `{
1357 if (!de
) return NULL;
1365 var stdin: PollableReader = new Stdin is protected writable, lazy
1368 var stdout: Writer = new Stdout is protected writable, lazy
1370 # Standard output for errors
1371 var stderr: Writer = new Stderr is protected writable, lazy
1373 # Enumeration for buffer mode full (flushes when buffer is full)
1374 fun buffer_mode_full: Int `{ return _IOFBF; `}
1376 # Enumeration for buffer mode line (flushes when a `\n` is encountered)
1377 fun buffer_mode_line
: Int `{ return _IONBF; `}
1379 # Enumeration for buffer mode none (flushes ASAP when something is written)
1380 fun buffer_mode_none: Int `{ return _IOLBF; `}
1382 # returns first available stream to read or write to
1383 # return null on interruption (possibly a signal)
1384 protected fun poll
( streams
: Sequence[FileStream] ) : nullable FileStream
1386 var in_fds
= new Array[Int]
1387 var out_fds
= new Array[Int]
1388 var fd_to_stream
= new HashMap[Int,FileStream]
1391 if s
isa FileReader then in_fds
.add
( fd
)
1392 if s
isa FileWriter then out_fds
.add
( fd
)
1394 fd_to_stream
[fd
] = s
1397 var polled_fd
= intern_poll
( in_fds
, out_fds
)
1399 if polled_fd
== null then
1402 return fd_to_stream
[polled_fd
]
1406 private fun intern_poll
(in_fds
: Array[Int], out_fds
: Array[Int]): nullable Int
1407 import Array[Int].length
, Array[Int].[], Int.as(nullable Int) `{
1408 int in_len, out_len, total_len;
1409 struct pollfd *c_fds;
1411 int first_polled_fd = -1;
1414 in_len = Array_of_Int_length( in_fds );
1415 out_len = Array_of_Int_length( out_fds );
1416 total_len = in_len + out_len;
1417 c_fds = malloc( sizeof(struct pollfd) * total_len );
1420 for ( i=0; i<in_len; i ++ ) {
1422 fd = Array_of_Int__index( in_fds, i );
1425 c_fds[i].events = POLLIN;
1428 /* output streams */
1429 for ( i=0; i<out_len; i ++ ) {
1431 fd = Array_of_Int__index( out_fds, i );
1434 c_fds[i].events = POLLOUT;
1437 /* poll all fds, unlimited timeout */
1438 result = poll( c_fds, total_len, -1 );
1441 /* analyse results */
1442 for ( i=0; i<total_len; i++ )
1443 if ( c_fds[i].revents & c_fds[i].events || /* awaited event */
1444 c_fds[i].revents & POLLHUP ) /* closed */
1446 first_polled_fd = c_fds[i].fd;
1450 return Int_as_nullable( first_polled_fd );
1452 else if ( result < 0 )
1453 fprintf( stderr, "Error in Stream:poll: %s\n", strerror( errno ) );
1460 # Print `objects` on the standard output (`stdout`).
1461 fun printn
(objects
: Object...)
1463 sys
.stdout
.write
(objects
.plain_to_s
)
1466 # Print an `object` on the standard output (`stdout`) and add a newline.
1467 fun print
(object
: Object)
1469 sys
.stdout
.write
(object
.to_s
)
1470 sys
.stdout
.write
("\n")
1473 # Print `object` on the error output (`stderr` or a log system)
1474 fun print_error
(object
: Object)
1476 sys
.stderr
.write object
.to_s
1477 sys
.stderr
.write
"\n"
1480 # Read a character from the standard input (`stdin`).
1483 var c
= sys
.stdin
.read_char
1484 if c
== null then return '\1'
1488 # Read a line from the standard input (`stdin`).
1491 return sys
.stdin
.read_line
1494 # Return the working (current) directory
1495 fun getcwd
: String do return native_getcwd
.to_s
1497 private fun native_getcwd
: NativeString `{ return getcwd(NULL, 0); `}