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<h2>Dylan mode</h2>
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Module: locators-internals
Synopsis: Abstract modeling of locations
Author: Andy Armstrong
Copyright: Original Code is Copyright (c) 1995-2004 Functional Objects, Inc.
All rights reserved.
License: See License.txt in this distribution for details.
Warranty: Distributed WITHOUT WARRANTY OF ANY KIND
define open generic locator-server
(locator :: <locator>) => (server :: false-or(<server-locator>));
define open generic locator-host
(locator :: <locator>) => (host :: false-or(<string>));
define open generic locator-volume
(locator :: <locator>) => (volume :: false-or(<string>));
define open generic locator-directory
(locator :: <locator>) => (directory :: false-or(<directory-locator>));
define open generic locator-relative?
(locator :: <locator>) => (relative? :: <boolean>);
define open generic locator-path
(locator :: <locator>) => (path :: <sequence>);
define open generic locator-base
(locator :: <locator>) => (base :: false-or(<string>));
define open generic locator-extension
(locator :: <locator>) => (extension :: false-or(<string>));
/// Locator classes
define open abstract class <directory-locator> (<physical-locator>)
end class <directory-locator>;
define open abstract class <file-locator> (<physical-locator>)
end class <file-locator>;
define method as
(class == <directory-locator>, string :: <string>)
=> (locator :: <directory-locator>)
as(<native-directory-locator>, string)
end method as;
define method make
(class == <directory-locator>,
#key server :: false-or(<server-locator>) = #f,
path :: <sequence> = #[],
relative? :: <boolean> = #f,
name :: false-or(<string>) = #f)
=> (locator :: <directory-locator>)
make(<native-directory-locator>,
server: server,
path: path,
relative?: relative?,
name: name)
end method make;
define method as
(class == <file-locator>, string :: <string>)
=> (locator :: <file-locator>)
as(<native-file-locator>, string)
end method as;
define method make
(class == <file-locator>,
#key directory :: false-or(<directory-locator>) = #f,
base :: false-or(<string>) = #f,
extension :: false-or(<string>) = #f,
name :: false-or(<string>) = #f)
=> (locator :: <file-locator>)
make(<native-file-locator>,
directory: directory,
base: base,
extension: extension,
name: name)
end method make;
/// Locator coercion
//---*** andrewa: This caching scheme doesn't work yet, so disable it.
define constant $cache-locators? = #f;
define constant $cache-locator-strings? = #f;
define constant $locator-to-string-cache = make(<object-table>, weak: #"key");
define constant $string-to-locator-cache = make(<string-table>, weak: #"value");
define open generic locator-as-string
(class :: subclass(<string>), locator :: <locator>)
=> (string :: <string>);
define open generic string-as-locator
(class :: subclass(<locator>), string :: <string>)
=> (locator :: <locator>);
define sealed sideways method as
(class :: subclass(<string>), locator :: <locator>)
=> (string :: <string>)
let string = element($locator-to-string-cache, locator, default: #f);
if (string)
as(class, string)
else
let string = locator-as-string(class, locator);
if ($cache-locator-strings?)
element($locator-to-string-cache, locator) := string;
else
string
end
end
end method as;
define sealed sideways method as
(class :: subclass(<locator>), string :: <string>)
=> (locator :: <locator>)
let locator = element($string-to-locator-cache, string, default: #f);
if (instance?(locator, class))
locator
else
let locator = string-as-locator(class, string);
if ($cache-locators?)
element($string-to-locator-cache, string) := locator;
else
locator
end
end
end method as;
/// Locator conditions
define class <locator-error> (<format-string-condition>, <error>)
end class <locator-error>;
define function locator-error
(format-string :: <string>, #rest format-arguments)
error(make(<locator-error>,
format-string: format-string,
format-arguments: format-arguments))
end function locator-error;
/// Useful locator protocols
define open generic locator-test
(locator :: <directory-locator>) => (test :: <function>);
define method locator-test
(locator :: <directory-locator>) => (test :: <function>)
\=
end method locator-test;
define open generic locator-might-have-links?
(locator :: <directory-locator>) => (links? :: <boolean>);
define method locator-might-have-links?
(locator :: <directory-locator>) => (links? :: singleton(#f))
#f
end method locator-might-have-links?;
define method locator-relative?
(locator :: <file-locator>) => (relative? :: <boolean>)
let directory = locator.locator-directory;
~directory | directory.locator-relative?
end method locator-relative?;
define method current-directory-locator?
(locator :: <directory-locator>) => (current-directory? :: <boolean>)
locator.locator-relative?
& locator.locator-path = #[#"self"]
end method current-directory-locator?;
define method locator-directory
(locator :: <directory-locator>) => (parent :: false-or(<directory-locator>))
let path = locator.locator-path;
unless (empty?(path))
make(object-class(locator),
server: locator.locator-server,
path: copy-sequence(path, end: path.size - 1),
relative?: locator.locator-relative?)
end
end method locator-directory;
/// Simplify locator
define open generic simplify-locator
(locator :: <physical-locator>)
=> (simplified-locator :: <physical-locator>);
define method simplify-locator
(locator :: <directory-locator>)
=> (simplified-locator :: <directory-locator>)
let path = locator.locator-path;
let relative? = locator.locator-relative?;
let resolve-parent? = ~locator.locator-might-have-links?;
let simplified-path
= simplify-path(path,
resolve-parent?: resolve-parent?,
relative?: relative?);
if (path ~= simplified-path)
make(object-class(locator),
server: locator.locator-server,
path: simplified-path,
relative?: locator.locator-relative?)
else
locator
end
end method simplify-locator;
define method simplify-locator
(locator :: <file-locator>) => (simplified-locator :: <file-locator>)
let directory = locator.locator-directory;
let simplified-directory = directory & simplify-locator(directory);
if (directory ~= simplified-directory)
make(object-class(locator),
directory: simplified-directory,
base: locator.locator-base,
extension: locator.locator-extension)
else
locator
end
end method simplify-locator;
/// Subdirectory locator
define open generic subdirectory-locator
(locator :: <directory-locator>, #rest sub-path)
=> (subdirectory :: <directory-locator>);
define method subdirectory-locator
(locator :: <directory-locator>, #rest sub-path)
=> (subdirectory :: <directory-locator>)
let old-path = locator.locator-path;
let new-path = concatenate-as(<simple-object-vector>, old-path, sub-path);
make(object-class(locator),
server: locator.locator-server,
path: new-path,
relative?: locator.locator-relative?)
end method subdirectory-locator;
/// Relative locator
define open generic relative-locator
(locator :: <physical-locator>, from-locator :: <physical-locator>)
=> (relative-locator :: <physical-locator>);
define method relative-locator
(locator :: <directory-locator>, from-locator :: <directory-locator>)
=> (relative-locator :: <directory-locator>)
let path = locator.locator-path;
let from-path = from-locator.locator-path;
case
~locator.locator-relative? & from-locator.locator-relative? =>
locator-error
("Cannot find relative path of absolute locator %= from relative locator %=",
locator, from-locator);
locator.locator-server ~= from-locator.locator-server =>
locator;
path = from-path =>
make(object-class(locator),
path: vector(#"self"),
relative?: #t);
otherwise =>
make(object-class(locator),
path: relative-path(path, from-path, test: locator.locator-test),
relative?: #t);
end
end method relative-locator;
define method relative-locator
(locator :: <file-locator>, from-directory :: <directory-locator>)
=> (relative-locator :: <file-locator>)
let directory = locator.locator-directory;
let relative-directory = directory & relative-locator(directory, from-directory);
if (relative-directory ~= directory)
simplify-locator
(make(object-class(locator),
directory: relative-directory,
base: locator.locator-base,
extension: locator.locator-extension))
else
locator
end
end method relative-locator;
define method relative-locator
(locator :: <physical-locator>, from-locator :: <file-locator>)
=> (relative-locator :: <physical-locator>)
let from-directory = from-locator.locator-directory;
case
from-directory =>
relative-locator(locator, from-directory);
~locator.locator-relative? =>
locator-error
("Cannot find relative path of absolute locator %= from relative locator %=",
locator, from-locator);
otherwise =>
locator;
end
end method relative-locator;
/// Merge locators
define open generic merge-locators
(locator :: <physical-locator>, from-locator :: <physical-locator>)
=> (merged-locator :: <physical-locator>);
/// Merge locators
define method merge-locators
(locator :: <directory-locator>, from-locator :: <directory-locator>)
=> (merged-locator :: <directory-locator>)
if (locator.locator-relative?)
let path = concatenate(from-locator.locator-path, locator.locator-path);
simplify-locator
(make(object-class(locator),
server: from-locator.locator-server,
path: path,
relative?: from-locator.locator-relative?))
else
locator
end
end method merge-locators;
define method merge-locators
(locator :: <file-locator>, from-locator :: <directory-locator>)
=> (merged-locator :: <file-locator>)
let directory = locator.locator-directory;
let merged-directory
= if (directory)
merge-locators(directory, from-locator)
else
simplify-locator(from-locator)
end;
if (merged-directory ~= directory)
make(object-class(locator),
directory: merged-directory,
base: locator.locator-base,
extension: locator.locator-extension)
else
locator
end
end method merge-locators;
define method merge-locators
(locator :: <physical-locator>, from-locator :: <file-locator>)
=> (merged-locator :: <physical-locator>)
let from-directory = from-locator.locator-directory;
if (from-directory)
merge-locators(locator, from-directory)
else
locator
end
end method merge-locators;
/// Locator protocols
define sideways method supports-open-locator?
(locator :: <file-locator>) => (openable? :: <boolean>)
~locator.locator-relative?
end method supports-open-locator?;
define sideways method open-locator
(locator :: <file-locator>, #rest keywords, #key, #all-keys)
=> (stream :: <stream>)
apply(open-file-stream, locator, keywords)
end method open-locator;
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