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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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