src/Pure/General/xml.ML
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(*  Title:      Pure/General/xml.ML
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    ID:         $Id$
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    Author:     David Aspinall, Stefan Berghofer and Markus Wenzel
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Basic support for XML.
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*)
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signature XML =
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sig
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  type attributes = Markup.property 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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    | Output of output
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  val add_content: tree -> Buffer.T -> Buffer.T
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  val detect: string -> bool
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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
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  val string_of: tree -> string
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  val output: tree -> TextIO.outstream -> unit
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  val parse_string : string -> string option
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  val parse_comments: string list -> unit * string list
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  val parse_element: string list -> tree * string list
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  val parse: string -> tree
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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 = Markup.property 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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  | Output of output;   (* FIXME !? *)
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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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  | add_content (Output _) = I;    (* FIXME !? *)
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(** string representation **)
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val detect = String.isPrefix "<?xml";
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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 (name, atts) =
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 (enclose "<" ">" (elem name atts),
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  enclose "</" ">" name);
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(* output *)
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fun buffer_of 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 (Elem (name, atts, ts)) =
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          Buffer.add "<" #> Buffer.add (elem name atts) #> Buffer.add ">" #>
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          fold traverse 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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      | traverse (Output s) = Buffer.add s;
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  in Buffer.empty |> traverse tree end;
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val string_of = Buffer.content o buffer_of;
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val output = Buffer.output o buffer_of;
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(** XML parsing (slow) **)
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local
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fun err s (xs, _) =
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  "XML parsing error: " ^ s ^ "\nfound: " ^ quote (Symbol.beginning 100 xs);
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val blanks = Scan.many Symbol.is_blank;
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val special = $$ "&" ^^ Symbol.scan_id ^^ $$ ";" >> 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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  (Symbol.scan_id --| (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 "-->" >> K [];
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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 "?>" >> K [];
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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_string = Scan.read Symbol.stopper parse_chars o 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 >> K [] ||
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        parse_comment >> K [])
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      @@@ parse_optional_text) >> flat)) xs
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and parse_element xs =
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  ($$ "<" |-- Symbol.scan_id --
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    Scan.repeat (blanks |-- parse_att) --| blanks :-- (fn (s, _) =>
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      !! (err "Expected > or />")
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        (Scan.this_string "/>" >> K []
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         || $$ ">" |-- parse_content --|
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            !! (err ("Expected </" ^ s ^ ">"))
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              (Scan.this_string ("</" ^ s) --| blanks --| $$ ">"))) >>
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    (fn ((s, atts), ts) => Elem (s, atts, ts))) xs;
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val parse_comments =
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  blanks -- Scan.repeat (parse_comment -- blanks >> K ()) >> K ();
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fun parse s =
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  (case Scan.finite Symbol.stopper (Scan.error (!! (err "Malformed element")
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      (blanks |-- parse_element --| blanks))) (Symbol.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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end;