(* This CDuce script produces CDuce web site. *)

(** Command line **)

let input =
  match argv with
  | [ s ] -> s
  | _ -> raise "Please specify an input file on the command line"


(** Output types **)

include "xhtml-strict.cd"  (* XHTML 1 Strict DTD *)
include "xhtml-categ.cd"   (* Categories (Inline, ...) from this DTD *)


(** Input types **)

type Page =  <page name=String new=?Any>[ <title>String <banner>[InlineText*]? Item* ]
type External = <external {|href=String; title=String; name=String |}>[]

type Item = 
   <box title=String link=String>Content
 | <meta>Content
 | <left>Content
 | Page
 | External

type Author = <author>String
type Paper = 
  <paper file=?String>[ 
     <title>String Author+ <comment>[InlineText*] <abstract>Content ]

type Slides = 
  <slides file=String>[ <title>String Author+ <comment>[InlineText*] ]

type Link =
  <link url=String title=String>[ InlineText* ]

type Content =      
   [ ( <p {|style=?String|}>[InlineText*]
     | <ul {||}>[<li {||}>Content +]
     | <section title=String>Content
     | <sample highlight=?"true"|"false">String
     | Xtable
     | Paper | Slides | Link
     | <boxes-toc>[]
     | <pages-toc subsections=?"">[]
     | <site-toc>[]
     | <local-links href=String>[]
     | <two-columns>[ <left>Content <right>Content ]
     | InlineText
     )* ]

type InlineText =
     Char
   | <(`b|`i|`tt|`em) {| style=?String |}>[InlineText*]
   | <code>String
   | <local href=String>String
   | <footnote>[InlineText*]
   | Xa | Ximg | Xbr 


(** Generic purpose functions **)

(* Recursive inclusion of XML files and verbatim text files *)

let load_include (String -> [Any*])
 name ->
(*   let _ = print [ 'Loading ' !name '... \n' ] in *)
   xtransform [ (load_xml name) ] with 
   | <include file=(s & String)>[] -> load_include s
   | <include-verbatim file=(s & String)>[] -> load_file s 

(* Highlighting text between {{...}} *)

let highlight (String -> [ (Char | Xvar | Xi)* ] )
 | [ '{{' h ::(Char *?) '}}' ; rest ] -> 
          [ <var class="highlight">h; highlight rest ]
 | [ '%%' h ::(Char *?) '%%' ; rest ] ->
          [ <i>h; highlight rest ]
 | [ c; rest ] -> [ c; highlight rest ]
 | [] -> []

(* Split a comma-separated string *)

let split_comma (String -> [String*])
 | [ x::(Char*?) ',' ; rest ] -> (x, split_comma rest)
 | s -> [ s ]


(** Internal types **)

type Path = [ { url = String; title = String }* ]
type Tree = { name = String; url = String; title = String; 
              children = [Tree*] } 

let url_of_name (String -> String)
   "index" -> "/"
 | s -> s @ ".html"

let authors ([Author+] -> String)
   | [ <author>a ] -> a
   | [ <author>a1 <author>a2 ] -> a1 @ ", and " @ a2
   | [ <author>a; rem ] -> a @ ", " @ authors rem

let find_local_link (sitemap : [Tree*], l : String) : Tree =
match sitemap with
 | (h,t) ->
   if (h . name = l) then h
   else 
    (try find_local_link (t,l) with `Not_found -> 
         find_local_link (h . children,l))
 | [] -> raise `Not_found

let local_link (sitemap : Tree, l : String, txt : String) : Inline =
 try 
  let h = find_local_link ([sitemap],l)  in
  let txt = if txt = "" then h . title else txt in
  <a href=(h . url)>txt
 with `Not_found -> raise [ 'Local link not found: ' !l ]
 
let compute_sitemap ((Page|External) -> Tree)
 <page name=name>[ <title>title (c::(Page|External) | _)* ] ->
   let children = map c with p -> compute_sitemap p in
   { name = name; url = (url_of_name name); title = title; children =children }
|<external name=name href=h title=t>[] ->
   { name = name; url = h; title = t; children = [] }

let display_sitemap (h : Tree) :  Xli =
  let ch = map h . children with x -> display_sitemap x in
  let ch = match ch with [] -> [] | l -> [ <ul>l ] in
  <li>[ <a href=(h . url)>(h . title); ch ]


let boxes_of  (Page -> [Xul?])
     <page name=n>[ (items::Item | _)*] ->
        let toc = 
         transform items with 
          <box title=t link=l>_ -> [ <li>[ <a href=((url_of_name n)@('#',l))>t ] ] in
        (match toc with [] -> [] | lis -> [ <ul>lis ])
 
let link_to (Page -> Xa)
 <page name=n new=_>[<title>t ; _ ] -> 
               <a href=(url_of_name n)>[!t 
                      <img src="img/new.gif" alt="(new)" style="border:0">[]]
| <page name=n>[<title>t ; _ ] -> <a href=(url_of_name n)>t

let box (x : Flow) : Block =
 <table cellpadding="2" 
    style="font-size:11px ; font-family:arial,sans-serif;
           border: solid 2px black; background: #ffffff" width="100%">
   [ <tr> [<td>x] ]

let meta (x : Flow) : Block =
 <table cellpadding="2" 
    style="border: solid 1px #b0b0b0; background: #e0e0e0; font-size: 80%" 
    width="100%">
   [ <tr> [<td>x] ]

let box_title (x : Flow, t : String) : Block =
 <table cellpadding="5" 
    style="border: solid 2px black; background: #ffffff" width="100%">
   [ <tr>[ <td style="background: #fff0f0; color: #0000ff; font: bold
100% helvetica">t ] <tr> [<td>x] ]

let style = "
a:link:hover, a:visited:hover {
  text-decoration: none;
  background: #FFFFD0;
  color: #FF0000;
}
p {
  text-align: justify;
  margin: 1ex 1em 0 1em;
}
pre {
  margin: 1ex 1em 0 1em;
}
var.highlight {
  color: #FF0000;
}
img.icon {
  border: 0;
}
div.code {
  background: #E0E0E0;
  margin: 0.5ex 0.5em 0 0.5em;
  padding: 0.2ex;
}
div.abstract { 
  font: bold 80% helvetica;
  margin: 1ex 1em 1ex 1em;
  padding: 1ex 1em 1ex 1em;
  background: #F0F0F0;
}
div.abstract p { 
  font: 100% sans-serif;
}
"

(* Main transformation function *)

(* returns the last page of the descendance *)
let gen_page (prev : Page|[], page : Page, next : Page|[], 
                  path : Path, sitemap : Tree) : (Page|[]) = 
match page with
<page name=name>[ 
        <title>title <banner>banner | <title>(title & banner); items ] ->

 let footnote_counter = ref Int 0 in 
 let footnotes = ref Flow [] in

 let text (t : [InlineText*]) : Inlines =
  transform t with
   | <code>x -> [ <b>[ <tt>(highlight x) ] ]
   | <local href=l>txt -> [ (local_link (sitemap,l,txt)) ]
   | <(tag & (`b|`i|`tt|`em)) (attr)>x -> [ <(tag) (attr)>(text x) ]
(*   | <a href=url>_ & z -> let [] = print [ 'Link: ' !url '\n'] in [z] *)
   | <footnote>c -> 
      footnote_counter := !footnote_counter + 1;
      let n = string_of !footnote_counter in
      let fn = !footnotes in
      footnotes := [];
      let c = <p>[ <a name=[ 'note' !n ]>[] 
                   <a href=[ '#bnote' !n ]>[ '[' !n ']' ]
		   ' ' ; text c ] in
      footnotes := fn @ [ c ] @ !footnotes;
      [ <a name=[ 'bnote' !n ]>[]
        <a href=[ '#note' !n ]>[ '[' !n ']' ] ]
   | z -> [ z ]
 in

 let content (t : Content) : Flow =
  transform t with
   | <section title=title>c -> 
         [ <p>[ <b style="color: #008000">title ] !(content c) ]
   | <paper (r)>[ <title>tit aut::Author* <comment>com <abstract>ab  ]  ->
         [ (match r with { file = f } -> <a href=f>tit | _ -> <b>tit) '. '
           !(authors aut) '. '
	   !(text com)
           <div class="abstract">[ 'Abstract:' !(content ab) ]
         ]
   | <slides file=f>[ <title>tit aut::Author* <comment>com ]  ->
        [ <a href=f>tit '. ' !(authors aut) '. ' !(text com) ]
   | <sample highlight="false">s ->
        [ <div class="code">[ <pre>s ] ]
   | <sample>s ->
        [ <div class="code">[ <pre>(highlight s) ] ]
   | <link url=url title=title>com -> 
        [ <a href=url>title '. ' !(text com) ]
   | <ul>lis -> 
        [ <ul>(map lis with <li>x -> <li>(content x)) ]
   | Xtable & x -> 
        [ x ]
   | <p (attr)>x -> [ <p (attr)>(text x) ]
   | <pages-toc (a)>[] ->
       let toc = 
         transform items with 
         | Page & p ->  [ <li>[ (link_to p) 
                           !(match a with {|sections=_|} -> (boxes_of p) | _ -> [])] ]
         | <external href=l title=t>[] -> [ <li>[ <a href=l>t ] ] in
        (match toc with [] -> [] | lis -> [ <ul>lis ])
   | <boxes-toc>[] ->
        let toc = 
         transform items with 
          <box title=t link=l>_ -> [ <li>[ <a href=('#',l)>t ] ] in
        (match toc with [] -> [] | lis -> [ <ul>lis ])
   | <site-toc>[] ->
        [ <ul>[ (display_sitemap sitemap) ] ]
   | <local-links href=s>[] ->
         (match (split_comma s) with
           | [] -> []
           | l -> let l = map l with x -> <li>[ (local_link(sitemap,x,"")) ]
                  in [ <ul>l ])
   | <two-columns>[ <left>x <right>y ] ->
	[ <table width="100%">[ 
            <tr>[ 
              <td valign="top">(content x) 
              <td valign="top">(content y) ] ] ]
   | t -> text [ t ]
 in

(* Preparing left panel *)
 let navig = transform items with <left>c -> [ c ] in
 let left = match navig with [] -> [ [<boxes-toc>[]] ] | n -> n in
 let left = 
   <td valign="top" align="left">[
     <table cellpadding="0" cellspacing="15" 
            width="200"
            style="font-size:80%; border: 1px dashed black;
                   background: #ffcd72">
     (map left with x -> <tr>[ <td>[ (box (content x)) ] ]) ] in

 let dpath : Inlines = transform path with 
  | { url = f; title = t } -> [ <a href=f>t ': '] 
 in
 let npath = path @ [ { url = (url_of_name name); title = title } ] in
 let subpages = transform items with p & Page -> [ p ] in
 let (next,last) = gen_page_seq (page, subpages, next, npath, sitemap) in
 let next = match next with [] -> [] 
   | <page name=n>[ <title>t; _ ] -> 
      [ <a href=(url_of_name n)>[ 
          <img width="16" height="16" class="icon" alt="Next page:"
               src="img/right.gif">[]
          ' ' !t
        ] ] in
 let prev = match prev with [] -> [] 
   | <page name=n>[ <title>t; _ ] -> 
      [ <a href=(url_of_name n)>[ 
          <img width="16" height="16" class="icon"
               alt="Previous page:" src="img/left.gif">[]
          ' ' !t
        ] ] in
 let navig = 
   if prev = [] then [] else
   [ (box [
     <p>[ !dpath !title ]
     <p>[ !prev ' ' !next ] ]) ] in

(* Preparing main panel *)
 let main = transform items with
  | <box (r)>c ->
      let b = [
         <a name=(r . link)>[] 
         !(content c) ] in
      [ (box_title (b,r . title)) ]
 | <meta>c -> [ (meta (content c)) ]
 in
 let notes = match !footnotes with
   | [] -> []
   | n -> [ (meta n) ] in
 let main = match (navig @ main @ notes @ navig) with
   | [] -> raise "Empty page !"
   | x -> x in

 let right : Xtd =
  <td valign="top" align="left" style="width:100%">[
   <table width="100%">[
    <tr>[ <td valign="top" align="left"
              style="border: 2px solid black; background: #ffffff;
text-align:center; color: #aa0000; font: bold 200% helvetica" >
          (text banner)
        ]
 
    <tr>[
      <td valign="top" align="left"
          style="border: 1px solid black; background: #fccead">[
       <table width="100%" cellpadding="0" cellspacing="17">
         (map main with x -> <tr>[ <td>[x] ])
      ] ]
  ] ] in

 let html : Xhtml =
 <html>[
  <head>[ 
   <title>[ 'CDuce: ' !title ]
   <meta content="text/html; charset=iso-8859-1" http-equiv="Content-Type">[]
   <style type="text/css">style
  ]
  <body style="margin: 0; padding : 0; background: #fcb333">[ 
   <table cellspacing="10" cellpadding="0" width="100%" border="0">[
    <tr>[ left right ]
   ]
  ]
 ]
 in
 let txt : Latin1 = 
   [ '<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"'
     '  "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">'
     !(print_xml html) ] in
 let fn = "www/" @ name @ ".html" in
 dump_to_file fn txt;
 last
	

let gen_page_seq 
 (prev : Page|[], pages : [Page*], next : Page|[], 
  path : Path, sitemap : Tree) : (Page|[], Page|[]) =
 match pages with
 | [ p1 p2 ; _ ] & [ _; rest ] -> 
     let last = gen_page (prev,p1,p2, path, sitemap) in
     let (_,last)  = gen_page_seq (last, rest, next, path, sitemap) in 
     (p1,last)
 | [ p ] ->
     let last = gen_page (prev,p,next, path, sitemap) in (p,last)
 | [] -> (next,prev)


;;

match load_include input with
 | [ Page & p ] -> let _ = gen_page ([],p,[], [], compute_sitemap p) in []
 | _ -> raise ("Invalid input document " @ input)