src/Pure/PIDE/xml.ML
author wenzelm
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(*  Title:      Pure/PIDE/xml.ML
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    Author:     David Aspinall
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    Author:     Stefan Berghofer
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    Author:     Makarius
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Untyped XML trees and representation of ML values.
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*)
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signature XML_DATA_OPS =
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sig
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  type 'a A
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  type 'a T
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  type 'a V
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  val int_atom: int A
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  val bool_atom: bool A
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  val unit_atom: unit A
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  val properties: Properties.T T
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  val string: string T
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  val int: int T
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  val bool: bool T
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  val unit: unit T
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  val pair: 'a T -> 'b T -> ('a * 'b) T
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  val triple: 'a T -> 'b T -> 'c T -> ('a * 'b * 'c) T
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  val list: 'a T -> 'a list T
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  val option: 'a T -> 'a option T
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  val variant: 'a V list -> 'a T
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end;
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signature XML =
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sig
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  type attributes = (string * string) list
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  datatype tree =
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      Elem of (string * attributes) * tree list
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    | Text of string
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  type body = tree list
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  val add_content: tree -> Buffer.T -> Buffer.T
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  val content_of: body -> string
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  val header: string
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  val text: string -> string
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  val element: string -> attributes -> string list -> string
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  val output_markup: Markup.T -> Output.output * Output.output
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  val string_of: tree -> string
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  val pretty: int -> tree -> Pretty.T
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  val output: tree -> TextIO.outstream -> unit
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  val parse_comments: string list -> unit * string list
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  val parse_string : string -> string option
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  val parse_element: string list -> tree * string list
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  val parse_document: string list -> tree * string list
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  val parse: string -> tree
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  exception XML_ATOM of string
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  exception XML_BODY of body
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  structure Encode: XML_DATA_OPS
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  structure Decode: XML_DATA_OPS
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end;
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structure XML: XML =
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struct
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(** XML trees **)
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type attributes = (string * string) list;
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datatype tree =
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    Elem of (string * attributes) * tree list
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  | Text of string;
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type body = tree list;
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fun add_content (Elem (_, ts)) = fold add_content ts
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  | add_content (Text s) = Buffer.add s;
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fun content_of body = Buffer.empty |> fold add_content body |> Buffer.content;
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(** string representation **)
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val header = "<?xml version=\"1.0\"?>\n";
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(* escaped text *)
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fun decode "&lt;" = "<"
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  | decode "&gt;" = ">"
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  | decode "&amp;" = "&"
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  | decode "&apos;" = "'"
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  | decode "&quot;" = "\""
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  | decode c = c;
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fun encode "<" = "&lt;"
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  | encode ">" = "&gt;"
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  | encode "&" = "&amp;"
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  | encode "'" = "&apos;"
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  | encode "\"" = "&quot;"
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  | encode c = c;
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val text = translate_string encode;
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(* elements *)
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fun elem name atts =
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  space_implode " " (name :: map (fn (a, x) => a ^ "=\"" ^ text x ^ "\"") atts);
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fun element name atts body =
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  let val b = implode body in
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    if b = "" then enclose "<" "/>" (elem name atts)
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    else enclose "<" ">" (elem name atts) ^ b ^ enclose "</" ">" name
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  end;
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fun output_markup (markup as (name, atts)) =
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  if Markup.is_empty markup then Markup.no_output
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  else (enclose "<" ">" (elem name atts), enclose "</" ">" name);
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(* output *)
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fun buffer_of depth tree =
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  let
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    fun traverse _ (Elem ((name, atts), [])) =
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          Buffer.add "<" #> Buffer.add (elem name atts) #> Buffer.add "/>"
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      | traverse d (Elem ((name, atts), ts)) =
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          Buffer.add "<" #> Buffer.add (elem name atts) #> Buffer.add ">" #>
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          traverse_body d ts #>
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          Buffer.add "</" #> Buffer.add name #> Buffer.add ">"
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      | traverse _ (Text s) = Buffer.add (text s)
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    and traverse_body 0 _ = Buffer.add "..."
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      | traverse_body d ts = fold (traverse (d - 1)) ts;
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  in Buffer.empty |> traverse depth tree end;
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val string_of = Buffer.content o buffer_of ~1;
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val output = Buffer.output o buffer_of ~1;
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fun pretty depth tree =
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  Pretty.str (Buffer.content (buffer_of (Int.max (0, depth)) tree));
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(** XML parsing **)
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local
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fun err msg (xs, _) =
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  fn () => "XML parsing error: " ^ msg () ^ "\nfound: " ^ quote (Symbol.beginning 100 xs);
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fun ignored _ = [];
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fun name_start_char c = Symbol.is_ascii_letter c orelse c = ":" orelse c = "_";
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fun name_char c = name_start_char c orelse Symbol.is_ascii_digit c orelse c = "-" orelse c = ".";
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val parse_name = Scan.one name_start_char ::: Scan.many name_char;
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val blanks = Scan.many Symbol.is_blank;
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val special = $$ "&" ^^ (parse_name >> implode) ^^ $$ ";" >> decode;
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val regular = Scan.one Symbol.is_regular;
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fun regular_except x = Scan.one (fn c => Symbol.is_regular c andalso c <> x);
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val parse_chars = Scan.repeat1 (special || regular_except "<") >> implode;
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val parse_cdata =
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  Scan.this_string "<![CDATA[" |--
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  (Scan.repeat (Scan.unless (Scan.this_string "]]>") regular) >> implode) --|
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  Scan.this_string "]]>";
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val parse_att =
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  ((parse_name >> implode) --| (blanks -- $$ "=" -- blanks)) --
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  (($$ "\"" || $$ "'") :|-- (fn s =>
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    (Scan.repeat (special || regular_except s) >> implode) --| $$ s));
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val parse_comment =
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  Scan.this_string "<!--" --
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  Scan.repeat (Scan.unless (Scan.this_string "-->") regular) --
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  Scan.this_string "-->" >> ignored;
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val parse_processing_instruction =
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  Scan.this_string "<?" --
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  Scan.repeat (Scan.unless (Scan.this_string "?>") regular) --
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  Scan.this_string "?>" >> ignored;
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val parse_doctype =
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  Scan.this_string "<!DOCTYPE" --
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  Scan.repeat (Scan.unless ($$ ">") regular) --
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  $$ ">" >> ignored;
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val parse_misc =
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  Scan.one Symbol.is_blank >> ignored ||
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  parse_processing_instruction ||
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  parse_comment;
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val parse_optional_text =
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  Scan.optional (parse_chars >> (single o Text)) [];
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in
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val parse_comments =
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  blanks -- Scan.repeat (parse_comment -- blanks >> K ()) >> K ();
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val parse_string = Scan.read Symbol.stopper parse_chars o raw_explode;
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fun parse_content xs =
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  (parse_optional_text @@@
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    (Scan.repeat
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      ((parse_element >> single ||
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        parse_cdata >> (single o Text) ||
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        parse_processing_instruction ||
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        parse_comment)
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      @@@ parse_optional_text) >> flat)) xs
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and parse_element xs =
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  ($$ "<" |-- parse_name -- Scan.repeat (blanks |-- parse_att) --| blanks :--
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    (fn (name, _) =>
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      !! (err (fn () => "Expected > or />"))
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       ($$ "/" -- $$ ">" >> ignored ||
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        $$ ">" |-- parse_content --|
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          !! (err (fn () => "Expected </" ^ implode name ^ ">"))
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              ($$ "<" -- $$ "/" -- Scan.this name -- blanks -- $$ ">")))
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    >> (fn ((name, atts), body) => Elem ((implode name, atts), body))) xs;
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val parse_document =
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  (Scan.repeat parse_misc -- Scan.option parse_doctype -- Scan.repeat parse_misc)
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  |-- parse_element;
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fun parse s =
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  (case Scan.finite Symbol.stopper (Scan.error (!! (err (fn () => "Malformed element"))
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      (blanks |-- parse_document --| blanks))) (raw_explode s) of
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    (x, []) => x
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  | (_, ys) => error ("XML parsing error: unprocessed input\n" ^ Symbol.beginning 100 ys));
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end;
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(** XML as data representation language **)
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exception XML_ATOM of string;
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exception XML_BODY of tree list;
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structure Encode =
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struct
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type 'a A = 'a -> string;
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type 'a T = 'a -> body;
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type 'a V = 'a -> string list * body;
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(* atomic values *)
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fun int_atom i = signed_string_of_int i;
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fun bool_atom false = "0"
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  | bool_atom true = "1";
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fun unit_atom () = "";
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(* structural nodes *)
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fun node ts = Elem ((":", []), ts);
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fun vector xs = map_index (fn (i, x) => (int_atom i, x)) xs;
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fun tagged (tag, (xs, ts)) = Elem ((int_atom tag, vector xs), ts);
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(* representation of standard types *)
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fun properties props = [Elem ((":", props), [])];
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fun string "" = []
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  | string s = [Text s];
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val int = string o int_atom;
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val bool = string o bool_atom;
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val unit = string o unit_atom;
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fun pair f g (x, y) = [node (f x), node (g y)];
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fun triple f g h (x, y, z) = [node (f x), node (g y), node (h z)];
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fun list f xs = map (node o f) xs;
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fun option _ NONE = []
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  | option f (SOME x) = [node (f x)];
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fun variant fs x =
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  [tagged (the (get_index (fn f => SOME (f x) handle General.Match => NONE) fs))];
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end;
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structure Decode =
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struct
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type 'a A = string -> 'a;
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type 'a T = body -> 'a;
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type 'a V = string list * body -> 'a;
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(* atomic values *)
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fun int_atom s =
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  Markup.parse_int s
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    handle Fail _ => raise XML_ATOM s;
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fun bool_atom "0" = false
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  | bool_atom "1" = true
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  | bool_atom s = raise XML_ATOM s;
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fun unit_atom "" = ()
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  | unit_atom s = raise XML_ATOM s;
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(* structural nodes *)
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fun node (Elem ((":", []), ts)) = ts
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  | node t = raise XML_BODY [t];
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fun vector atts =
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  map_index (fn (i, (a, x)) => if int_atom a = i then x else raise XML_ATOM a) atts;
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fun tagged (Elem ((name, atts), ts)) = (int_atom name, (vector atts, ts))
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  | tagged t = raise XML_BODY [t];
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(* representation of standard types *)
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fun properties [Elem ((":", props), [])] = props
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  | properties ts = raise XML_BODY ts;
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fun string [] = ""
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  | string [Text s] = s
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  | string ts = raise XML_BODY ts;
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val int = int_atom o string;
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val bool = bool_atom o string;
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val unit = unit_atom o string;
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fun pair f g [t1, t2] = (f (node t1), g (node t2))
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  | pair _ _ ts = raise XML_BODY ts;
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fun triple f g h [t1, t2, t3] = (f (node t1), g (node t2), h (node t3))
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  | triple _ _ _ ts = raise XML_BODY ts;
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fun list f ts = map (f o node) ts;
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fun option _ [] = NONE
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  | option f [t] = SOME (f (node t))
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  | option _ ts = raise XML_BODY ts;
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fun variant fs [t] =
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      let
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        val (tag, (xs, ts)) = tagged t;
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        val f = nth fs tag handle General.Subscript => raise XML_BODY [t];
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      in f (xs, ts) end
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  | variant _ ts = raise XML_BODY ts;
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end;
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end;