author | wenzelm |
Fri, 28 Sep 2012 22:53:18 +0200 | |
changeset 49650 | 9fad6480300d |
parent 49599 | e716209814b3 |
child 56059 | 2390391584c2 |
permissions | -rw-r--r-- |
44698 | 1 |
(* 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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||
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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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||
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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 wrap_elem: ((string * attributes) * tree list) * tree list -> tree |
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val unwrap_elem: tree -> (((string * attributes) * tree list) * tree list) option |
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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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||
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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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(* wrapped elements *) |
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val xml_elemN = "xml_elem"; |
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val xml_nameN = "xml_name"; |
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val xml_bodyN = "xml_body"; |
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fun wrap_elem (((a, atts), body1), body2) = |
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Elem ((xml_elemN, (xml_nameN, a) :: atts), Elem ((xml_bodyN, []), body1) :: body2); |
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fun unwrap_elem (Elem ((name, (n, a) :: atts), Elem ((name', atts'), body1) :: body2)) = |
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if name = xml_elemN andalso n = xml_nameN andalso name' = xml_bodyN andalso null atts' |
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then SOME (((a, atts), body1), body2) else NONE |
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| unwrap_elem _ = NONE; |
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(* text context *) |
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fun add_content tree = |
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(case unwrap_elem tree of |
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SOME (_, ts) => fold add_content ts |
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| NONE => |
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(case tree of |
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Elem (_, ts) => fold add_content ts |
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| 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 "<" = "<" |
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| decode ">" = ">" |
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| decode "&" = "&" |
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| decode "'" = "'" |
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| decode """ = "\"" |
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| decode c = c; |
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fun encode "<" = "<" |
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| encode ">" = ">" |
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| encode "&" = "&" |
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| encode "'" = "'" |
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| encode "\"" = """ |
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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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||
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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; |
180 |
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 = |
185 |
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 -- $$ "=" -- blanks)) -- |
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(($$ "\"" || $$ "'") :|-- (fn s => |
192 |
(Scan.repeat (special || regular_except s) >> implode) --| $$ s)); |
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val parse_comment = |
195 |
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 = |
200 |
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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203 |
|
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val parse_doctype = |
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205 |
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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|
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val parse_optional_text = |
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215 |
Scan.optional (parse_chars >> (single o Text)) []; |
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|
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in |
218 |
||
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val parse_comments = |
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blanks -- Scan.repeat (parse_comment -- blanks >> K ()) >> K (); |
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221 |
|
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val parse_string = Scan.read Symbol.stopper parse_chars o raw_explode; |
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|
24264 | 224 |
fun parse_content xs = |
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(parse_optional_text @@@ |
226 |
(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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|
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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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249 |
(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)); |
24264 | 252 |
|
253 |
end; |
|
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|
43767 | 255 |
|
256 |
||
257 |
(** XML as data representation language **) |
|
258 |
||
259 |
exception XML_ATOM of string; |
|
260 |
exception XML_BODY of tree list; |
|
261 |
||
262 |
||
263 |
structure Encode = |
|
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struct |
|
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||
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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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|
270 |
||
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(* atomic values *) |
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|
273 |
fun int_atom i = signed_string_of_int i; |
|
274 |
||
275 |
fun bool_atom false = "0" |
|
276 |
| bool_atom true = "1"; |
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277 |
||
278 |
fun unit_atom () = ""; |
|
279 |
||
280 |
||
281 |
(* structural nodes *) |
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282 |
||
283 |
fun node ts = Elem ((":", []), ts); |
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284 |
||
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fun vector xs = map_index (fn (i, x) => (int_atom i, x)) xs; |
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286 |
|
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287 |
fun tagged (tag, (xs, ts)) = Elem ((int_atom tag, vector xs), ts); |
43767 | 288 |
|
289 |
||
290 |
(* representation of standard types *) |
|
291 |
||
292 |
fun properties props = [Elem ((":", props), [])]; |
|
293 |
||
294 |
fun string "" = [] |
|
295 |
| string s = [Text s]; |
|
296 |
||
297 |
val int = string o int_atom; |
|
298 |
||
299 |
val bool = string o bool_atom; |
|
300 |
||
301 |
val unit = string o unit_atom; |
|
302 |
||
303 |
fun pair f g (x, y) = [node (f x), node (g y)]; |
|
304 |
||
305 |
fun triple f g h (x, y, z) = [node (f x), node (g y), node (h z)]; |
|
306 |
||
307 |
fun list f xs = map (node o f) xs; |
|
308 |
||
309 |
fun option _ NONE = [] |
|
310 |
| option f (SOME x) = [node (f x)]; |
|
311 |
||
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312 |
fun variant fs x = |
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313 |
[tagged (the (get_index (fn f => SOME (f x) handle General.Match => NONE) fs))]; |
43767 | 314 |
|
26546 | 315 |
end; |
43767 | 316 |
|
317 |
||
318 |
structure Decode = |
|
319 |
struct |
|
320 |
||
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321 |
type 'a A = string -> 'a; |
43767 | 322 |
type 'a T = body -> 'a; |
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type 'a V = string list * body -> 'a; |
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|
325 |
||
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326 |
(* atomic values *) |
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|
328 |
fun int_atom s = |
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329 |
Markup.parse_int s |
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330 |
handle Fail _ => raise XML_ATOM s; |
43767 | 331 |
|
332 |
fun bool_atom "0" = false |
|
333 |
| bool_atom "1" = true |
|
334 |
| bool_atom s = raise XML_ATOM s; |
|
335 |
||
336 |
fun unit_atom "" = () |
|
337 |
| unit_atom s = raise XML_ATOM s; |
|
338 |
||
339 |
||
340 |
(* structural nodes *) |
|
341 |
||
342 |
fun node (Elem ((":", []), ts)) = ts |
|
343 |
| node t = raise XML_BODY [t]; |
|
344 |
||
43783 | 345 |
fun vector atts = |
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346 |
map_index (fn (i, (a, x)) => if int_atom a = i then x else raise XML_ATOM a) atts; |
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347 |
|
43844 | 348 |
fun tagged (Elem ((name, atts), ts)) = (int_atom name, (vector atts, ts)) |
43767 | 349 |
| tagged t = raise XML_BODY [t]; |
350 |
||
351 |
||
352 |
(* representation of standard types *) |
|
353 |
||
354 |
fun properties [Elem ((":", props), [])] = props |
|
355 |
| properties ts = raise XML_BODY ts; |
|
356 |
||
357 |
fun string [] = "" |
|
358 |
| string [Text s] = s |
|
359 |
| string ts = raise XML_BODY ts; |
|
360 |
||
361 |
val int = int_atom o string; |
|
362 |
||
363 |
val bool = bool_atom o string; |
|
364 |
||
365 |
val unit = unit_atom o string; |
|
366 |
||
367 |
fun pair f g [t1, t2] = (f (node t1), g (node t2)) |
|
368 |
| pair _ _ ts = raise XML_BODY ts; |
|
369 |
||
370 |
fun triple f g h [t1, t2, t3] = (f (node t1), g (node t2), h (node t3)) |
|
371 |
| triple _ _ _ ts = raise XML_BODY ts; |
|
372 |
||
373 |
fun list f ts = map (f o node) ts; |
|
374 |
||
375 |
fun option _ [] = NONE |
|
376 |
| option f [t] = SOME (f (node t)) |
|
377 |
| option _ ts = raise XML_BODY ts; |
|
378 |
||
43768 | 379 |
fun variant fs [t] = |
380 |
let |
|
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381 |
val (tag, (xs, ts)) = tagged t; |
43768 | 382 |
val f = nth fs tag handle General.Subscript => raise XML_BODY [t]; |
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|
383 |
in f (xs, ts) end |
43767 | 384 |
| variant _ ts = raise XML_BODY ts; |
385 |
||
386 |
end; |
|
387 |
||
388 |
end; |