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+<h2>Dylan mode</h2>
+
+
+<div><textarea id="code" name="code">
+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;
+</textarea></div>
+
+ <script>
+ var editor = CodeMirror.fromTextArea(document.getElementById("code"), {
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+ });
+ </script>
+
+ <p><strong>MIME types defined:</strong> <code>text/x-dylan</code>.</p>
+</article>