src/Pure/General/path.ML
author wenzelm
Tue, 21 May 2013 21:05:10 +0200
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(*  Title:      Pure/General/path.ML
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    Author:     Markus Wenzel, TU Muenchen
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Algebra of file-system paths: basic POSIX notation, extended by named
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roots (e.g. //foo) and variables (e.g. $BAR).
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*)
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signature PATH =
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sig
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  eqtype T
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  val is_current: T -> bool
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  val current: T
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  val root: T
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  val named_root: string -> T
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  val parent: T
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  val basic: string -> T
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  val variable: string -> T
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  val is_absolute: T -> bool
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  val is_basic: T -> bool
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  val append: T -> T -> T
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  val appends: T list -> T
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  val make: string list -> T
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  val implode: T -> string
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  val explode: string -> T
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  val pretty: T -> Pretty.T
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  val print: T -> string
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  val dir: T -> T
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  val base: T -> T
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  val ext: string -> T -> T
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  val split_ext: T -> T * string
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  val expand: T -> T
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  val position: T -> Position.T
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end;
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structure Path: PATH =
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struct
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(* path elements *)
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datatype elem =
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  Root of string |
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  Basic of string |
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  Variable of string |
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  Parent;
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local
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fun err_elem msg s = error (msg ^ " path element specification " ^ quote s);
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fun check_elem s =
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  if s = "" orelse s = "~" orelse s = "~~" then err_elem "Illegal" s
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  else
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    let
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      fun check c =
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        if exists_string (fn c' => c = c') s then
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          err_elem ("Illegal character " ^ quote c ^ " in") s
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        else ();
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      val _ = List.app check ["/", "\\", "$", ":", "\"", "'"];
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    in s end;
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in
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val root_elem = Root o check_elem;
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val basic_elem = Basic o check_elem;
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val variable_elem = Variable o check_elem;
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end;
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(* type path *)
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datatype T = Path of elem list;    (*reversed elements*)
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fun rep (Path xs) = xs;
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fun is_current (Path []) = true
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  | is_current _ = false;
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val current = Path [];
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val root = Path [Root ""];
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fun named_root s = Path [root_elem s];
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fun basic s = Path [basic_elem s];
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fun variable s = Path [variable_elem s];
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val parent = Path [Parent];
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fun is_absolute (Path xs) =
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  (case try List.last xs of
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    SOME (Root _) => true
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  | _ => false);
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fun is_basic (Path [Basic _]) = true
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  | is_basic _ = false;
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(* append and norm *)
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fun apply (y as Root _) _ = [y]
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  | apply Parent (xs as (Root _ :: _)) = xs
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  | apply Parent (Basic _ :: rest) = rest
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  | apply y xs = y :: xs;
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fun append (Path xs) (Path ys) = Path (fold_rev apply ys xs);
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fun appends paths = Library.foldl (uncurry append) (current, paths);
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val make = appends o map basic;
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fun norm elems = fold_rev apply elems [];
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(* implode *)
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local
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fun implode_elem (Root "") = ""
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  | implode_elem (Root s) = "//" ^ s
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  | implode_elem (Basic s) = s
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  | implode_elem (Variable s) = "$" ^ s
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  | implode_elem Parent = "..";
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in
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fun implode_path (Path []) = "."
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  | implode_path (Path [Root ""]) = "/"
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  | implode_path (Path xs) = space_implode "/" (rev (map implode_elem xs));
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end;
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(* explode *)
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fun explode_path str =
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  let
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    fun explode_elem s =
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     (if s = ".." then Parent
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      else if s = "~" then Variable "USER_HOME"
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      else if s = "~~" then Variable "ISABELLE_HOME"
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      else
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        (case try (unprefix "$") s of
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          SOME s' => variable_elem s'
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        | NONE => basic_elem s))
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      handle ERROR msg => cat_error msg ("The error(s) above occurred in " ^ quote str);
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    val (roots, raw_elems) =
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      (case take_prefix (equal "") (space_explode "/" str) |>> length of
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        (0, es) => ([], es)
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      | (1, es) => ([Root ""], es)
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      | (_, []) => ([Root ""], [])
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      | (_, e :: es) => ([root_elem e], es));
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    val elems = raw_elems |> filter_out (fn c => c = "" orelse c = ".") |> map explode_elem;
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  in Path (norm (rev elems @ roots)) end;
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(* print *)
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fun pretty path =
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  let val s = implode_path path
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  in Pretty.mark (Markup.path s) (Pretty.str (quote s)) end;
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val print = Pretty.str_of o pretty;
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(* base element *)
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fun split_path f (Path (Basic s :: xs)) = f (Path xs, s)
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  | split_path _ path = error ("Cannot split path into dir/base: " ^ print path);
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val dir = split_path #1;
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val base = split_path (fn (_, s) => Path [Basic s]);
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fun ext "" = I
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  | ext e = split_path (fn (prfx, s) => append prfx (basic (s ^ "." ^ e)));
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val split_ext = split_path (fn (prfx, s) => apfst (append prfx)
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  (case take_suffix (fn c => c <> ".") (raw_explode s) of
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    ([], _) => (Path [Basic s], "")
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  | (cs, e) => (Path [Basic (implode (take (length cs - 1) cs))], implode e)));
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(* expand variables *)
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fun eval (Variable s) =
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      let val path = explode_path (getenv_strict s) in
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        if exists (fn Variable _ => true | _ => false) (rep path) then
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          error ("Illegal path variable nesting: " ^ s ^ "=" ^ print path)
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        else rep path
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      end
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  | eval x = [x];
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val expand = rep #> maps eval #> norm #> Path;
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(* source position -- with smart replacement of ISABELLE_HOME *)
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val isabelle_home = explode_path "~~";
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fun position path =
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  let
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    val s = implode_path path;
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    val prfx = implode_path (expand isabelle_home) ^ "/";
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  in
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    Position.file
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      (case try (unprefix prfx) s of
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        NONE => s
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      | SOME s' => "~~/" ^ s')
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  end;
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(*final declarations of this structure!*)
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val implode = implode_path;
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val explode = explode_path;
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end;
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