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(***********************************************************************)
(* *)
(* HEVEA *)
(* *)
(* Luc Maranget, projet Moscova, INRIA Rocquencourt *)
(* *)
(* Copyright 2001 Institut National de Recherche en Informatique et *)
(* Automatique. Distributed only by permission. *)
(* *)
(* $Id: htmllex.mll,v 1.9 2001/05/29 15:09:22 maranget Exp $ *)
(***********************************************************************)
{
open Lexing
open Lexeme
open Buff
let txt_level = ref 0
and txt_stack = Stack.create "htmllex"
exception Error of string
;;
let error msg lb =
raise (Error msg)
let init table (s,t)= Hashtbl.add table s t
;;
let block = Hashtbl.create 17
;;
List.iter (init block)
["CENTER", () ; "DIV", (); "BLOCKQUOTE", () ;
"H1", () ; "H2", () ;"H3", () ;"H4", () ;"H5", () ;"H6", () ;
"PRE", () ; "TABLE", () ; "TR",() ; "TD", () ; "TH",() ;
"OL",() ; "UL",(); "P",() ; "LI",() ;
"DL",() ; "DT", () ; "DD",() ;
]
;;
let ptop () =
if not (Stack.empty txt_stack) then begin
let pos = Stack.top txt_stack in
Location.print_this_fullpos pos ;
prerr_endline "This opening tag is pending"
end
let warnings = ref true
let check_nesting lb name =
try
Hashtbl.find block (String.uppercase name) ;
if !txt_level <> 0 && !warnings then begin
Location.print_fullpos () ;
prerr_endline
("Warning, block level element: "^name^" nested inside text-level element") ;
ptop ()
end
with
| Not_found -> ()
let text = Hashtbl.create 17
;;
List.iter (init text)
["TT",TT ; "I",I ; "B",B ; "BIG",BIG ; "SMALL",SMALL ;
"STRIKE",STRIKE ; "S",S ; "U",U ; "FONT",FONT ;
"EM",EM ; "STRONG",STRONG ; "DFN",DFN ; "CODE",CODE ; "SAMP",SAMP ;
"KBD",KBD ; "VAR",VAR ; "CITE",CITE ; "ABBR",ABBR ; "ACRONYM",ACRONYM ;
"Q",Q ; "SUB",SUB ; "SUP",SUP ; "A", A ; "SPAN", SPAN ; "SCRIPT", SCRIPT]
;;
let is_textlevel name =
try
let _ = Hashtbl.find text (String.uppercase name) in
true
with
| Not_found -> false
let is_br name = "BR" = (String.uppercase name)
let is_basefont name = "BASEFONT" = (String.uppercase name)
let set_basefont attrs lb =
List.iter
(fun (name,v,_) -> match String.uppercase name,v with
| "SIZE",Some s ->
begin try
Emisc.basefont := int_of_string s
with
| _ -> error "BASEFONT syntax" lb
end
| _ -> ())
attrs
let get_value lb = function
| Some s -> s
| _ -> error "Bad attribute syntax" lb
let norm_attrs lb attrs =
List.map
(fun (name,value,txt) ->
match String.uppercase name with
| "SIZE" -> SIZE (get_value lb value),txt
| "COLOR" -> COLOR (get_value lb value),txt
| "FACE" -> FACE (get_value lb value),txt
| _ -> OTHER, txt)
attrs
let print_attrs s attrs =
print_string s ; print_string ":" ;
List.iter
(fun x -> match x with
| name,Some value when name=s ->
print_char ' ' ;
print_string value
| _ -> ())
attrs ;
print_char '\n'
let ouvre lb name attrs txt =
let uname = String.uppercase name in
try
let tag = Hashtbl.find text uname in
let attrs = norm_attrs lb attrs in
incr txt_level ;
Stack.push txt_stack (Location.get_pos ()) ;
Open (tag, attrs,txt)
with
| Not_found -> assert false
and ferme lb name txt =
try
let tag = Hashtbl.find text (String.uppercase name) in
decr txt_level ;
begin if not (Stack.empty txt_stack) then
let _ = Stack.pop txt_stack in ()
end ;
Close (tag,txt)
with
| Not_found -> Text txt
let unquote s =
let l = String.length s in
String.sub s 1 (l-2)
;;
let buff = Buff.create ()
and abuff = Buff.create ()
let put s = Buff.put buff s
and putc c = Buff.put_char buff c
let aput s = Buff.put abuff s
and aputc c = Buff.put_char abuff c
}
let blank = [' ''\t''\n''\r']
rule main = parse
| (blank|" ")+ {Blanks (lexeme lexbuf)}
| "<!--"
{put (lexeme lexbuf) ;
in_comment lexbuf ;
Text (Buff.to_string buff)}
| "<!"
{put (lexeme lexbuf) ;
in_tag lexbuf ;
Text (Buff.to_string buff)}
| '<'
{putc '<' ;
let tag = read_tag lexbuf in
if is_textlevel tag then begin
let attrs = read_attrs lexbuf in
ouvre lexbuf tag attrs (Buff.to_string buff)
end else if is_basefont tag then begin
let attrs = read_attrs lexbuf in
set_basefont attrs lexbuf ;
Text (Buff.to_string buff)
end else begin
check_nesting lexbuf tag ;
in_tag lexbuf ;
let txt = Buff.to_string buff in
if is_br tag then
Blanks txt
else
Text txt
end}
| "</"
{put "</" ;
let tag = read_tag lexbuf in
in_tag lexbuf ;
ferme lexbuf tag (Buff.to_string buff)}
| eof {Eof}
| _
{putc (lexeme_char lexbuf 0) ;
text lexbuf ;
Text (Buff.to_string buff)}
and text = parse
| [^'<']
{putc (lexeme_char lexbuf 0) ; text lexbuf}
| "" {()}
and read_tag = parse
| ['a'-'z''A'-'Z''0'-'9']*
{let lxm = lexeme lexbuf in
put lxm ; lxm}
and read_attrs = parse
| blank+
{aput (lexeme lexbuf) ; read_attrs lexbuf}
| ['a'-'z''A'-'Z''-''0'-'9']+
{let name = lexeme lexbuf in
aput name ;
let v = read_avalue lexbuf in
let atxt = Buff.to_string abuff in
put atxt ;
(name,v,atxt)::read_attrs lexbuf}
| '>' {put_char buff '>' ; []}
| "" {error "Attribute syntax" lexbuf}
and read_avalue = parse
| blank* '=' blank*
{let lxm = lexeme lexbuf in
aput lxm ;
Some (read_aavalue lexbuf)}
| "" {None}
and read_aavalue = parse
| '\''[^'\'']*'\''
| '"'[^'"']*'"'
{let lxm = lexeme lexbuf in
aput lxm ;
unquote lxm}
| '#'?['a'-'z''A'-'Z''0'-'9''-''+''_'':''.']+
{let lxm = lexeme lexbuf in
aput lxm ;
lxm}
| "" {error "Attribute syntax" lexbuf}
and in_tag = parse
| '>' {putc (lexeme_char lexbuf 0)}
| _ {putc (lexeme_char lexbuf 0) ; in_tag lexbuf}
| eof {error "End of file in tag" lexbuf}
and in_comment = parse
| "-->" '\n'?
{put (lexeme lexbuf)}
| _
{putc (lexeme_char lexbuf 0) ; in_comment lexbuf}
| eof
{error "End of file in comment" lexbuf}
{
let to_string = function
| Open (_,_,txt) | Close (_,txt) | Text txt | Blanks txt -> txt
| Eof -> "Eof"
let rec cost = function
| {tag=FONT ; attrs=attrs} -> (1,List.length attrs)
| _ -> (1,0)
let tok_buff = ref None
;;
let txt_buff = Buff.create ()
;;
let rec read_tokens blanks lb =
let t = main lb in
match t with
| Text txt -> Buff.put txt_buff txt ; read_tokens false lb
| Blanks txt -> Buff.put txt_buff txt ; read_tokens blanks lb
| _ ->
let txt = Buff.to_string txt_buff in
match txt with
| "" -> t
| _ ->
tok_buff := Some t ;
if blanks then
Blanks txt
else
Text txt
let reset () =
txt_level := 0 ;
Stack.reset txt_stack ;
Buff.reset txt_buff ;
Buff.reset buff ;
Buff.reset abuff
let next_token lb =
try match !tok_buff with
| Some t -> tok_buff := None ; t
| None -> read_tokens true lb
with
| e ->
reset () ;
raise e
}
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