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