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tabular.mll
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tabular.mll
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(***********************************************************************)
(* *)
(* HEVEA *)
(* *)
(* Luc Maranget, projet PARA, INRIA Rocquencourt *)
(* *)
(* Copyright 1998 Institut National de Recherche en Informatique et *)
(* Automatique. Distributed only by permission. *)
(* *)
(***********************************************************************)
(* $Id: tabular.mll,v 1.31 2006-02-03 12:25:49 maranget Exp $ *)
{
open Misc
open Lexing
open Table
open Lexstate
open Subst
exception Error of string
;;
type align =
{hor : string ; mutable vert : string ; wrap : bool ;
mutable pre : string ; mutable post : string ; width : Length.t}
let make_hor = function
'c' -> "center"
| 'l' -> "left"
| 'r' -> "right"
| 'p'|'m'|'b' -> "left"
| _ -> raise (Misc.Fatal "make_hor")
and make_vert = function
| 'c'|'l'|'r' -> ""
| 'p' -> "top"
| 'm' -> "middle"
| 'b' -> "bottom"
| _ -> raise (Misc.Fatal "make_vert")
type format =
Align of align
| Inside of string
| Border of string
;;
(* Patch vertical alignment (for HTML) *)
let check_vert f =
try
for i = 0 to Array.length f-1 do
match f.(i) with
| Align {vert=s} when s <> "" -> raise Exit
| _ -> ()
done ;
f
with Exit -> begin
for i = 0 to Array.length f-1 do
match f.(i) with
| Align ({vert=""} as f) ->
f.vert <- "top"
| _ -> ()
done ;
f
end
(* Compute missing length (for text) *)
and check_length f =
for i = 0 to Array.length f - 1 do
match f.(i) with
| Align ({wrap=true ; width=Length.No _} as r) ->
f.(i) <-
Align
{r with
width =
Length.Percent
(truncate (100.0 /. float (Array.length f)))}
| _ -> ()
done
let border = ref false
let push s e = s := e:: !s
and pop s = match !s with
[] -> raise (Misc.Fatal "Empty stack in Latexscan")
| e::rs -> s := rs ; e
let out_table = Table.create (Inside "")
let pretty_format = function
| Align {vert = v ; hor = h ; pre = pre ; post = post ; wrap = b ; width = w}
->
"[>{"^pre^"}"^
", h="^h^", v="^v^
", <{"^post^"}"^(if b then ", wrap" else "")^
", w="^Length.pretty w^"]"
| Inside s -> "@{"^s^"}"
| Border s -> s
let pretty_formats f =
Array.iter (fun f -> prerr_string (pretty_format f) ; prerr_string "; ") f
(* For some reason pre/post-ludes are executed right to left *)
let concat_pre_post x y = match x, y with
| "", _ -> y
| _, "" -> x
| _,_ -> y ^ "{}" ^ x
}
rule tfone = parse
| [' ''\t''\n''\r'] {tfone lexbuf}
| '>'
{let pre = subst_arg lexbuf in
tfone lexbuf ;
try
apply out_table (function
| Align a ->
a.pre <- concat_pre_post pre a.pre ;
| _ -> raise (Error "Bad syntax in array argument (>)"))
with Table.Empty ->
raise (Error "Bad syntax in array argument (>)")}
| "" {tfmiddle lexbuf}
and tfmiddle = parse
| [' ''\t''\n''\r'] {tfmiddle lexbuf}
| ['c''l''r']
{let f = Lexing.lexeme_char lexbuf 0 in
let post = tfpostlude lexbuf in
emit out_table
(Align {hor = make_hor f ; vert = make_vert f ; wrap = false ;
pre = "" ; post = post ; width = Length.Default})}
| ['p''m''b']
{let f = Lexing.lexeme_char lexbuf 0 in
let width = subst_arg lexbuf in
let my_width = Length.main (Lexing.from_string width) in
let post = tfpostlude lexbuf in
emit out_table
(Align {hor = make_hor f ; vert = make_vert f ; wrap = true ;
pre = "" ; post = post ; width = my_width})}
| '#' ['1'-'9']
{let lxm = lexeme lexbuf in
let i = Char.code (lxm.[1]) - Char.code '1' in
Lexstate.scan_arg (scan_this_arg tfmiddle) i}
| '%' [^'\n']* '\n'
{tfmiddle lexbuf}
| [^'|' '@' '<' '>' '!' '#']
{let lxm = lexeme lexbuf in
let name = column_to_command lxm in
let pat,body = Latexmacros.find name in
let args = Lexstate.make_stack name pat lexbuf in
let cur_subst = get_subst () in
Lexstate.scan_body
(function
| Lexstate.Subst body ->
scan_this_may_cont
lexformat lexbuf cur_subst (string_to_arg body) ;
| _ -> assert false)
body args ;
let post = tfpostlude lexbuf in
if post <> "" then
try
Table.apply out_table
(function
| Align f -> f.post <- post
| _ -> Misc.warning ("``<'' after ``@'' in tabular arg scanning"))
with
| Table.Empty ->
raise (Error ("``<'' cannot start tabular arg"))}
| eof {()}
| ""
{let rest =
String.sub lexbuf.lex_buffer lexbuf.lex_curr_pos
(lexbuf.lex_buffer_len - lexbuf.lex_curr_pos) in
raise (Error ("Syntax of array format near: "^rest))}
and tfpostlude = parse
| [' ''\t''\n''\r'] {tfpostlude lexbuf}
| '<'
{let one = subst_arg lexbuf in
let rest = tfpostlude lexbuf in
let r = concat_pre_post one rest in
r}
| eof
{if Stack.empty stack_lexbuf then
""
else
let lexbuf = previous_lexbuf () in
tfpostlude lexbuf}
| "" {""}
and lexformat = parse
| [' ''\t''\n''\r'] {lexformat lexbuf}
| '*'
{let ntimes = save_arg lexbuf in
let what = save_arg lexbuf in
let rec do_rec = function
0 -> lexformat lexbuf
| i ->
scan_this_arg lexformat what ; do_rec (i-1) in
do_rec (Get.get_int ntimes)}
| '|' {border := true ; emit out_table (Border "|") ; lexformat lexbuf}
| '@'|'!'
{let lxm = Lexing.lexeme_char lexbuf 0 in
let inside = subst_arg lexbuf in
if lxm = '!' || inside <> "" then emit out_table (Inside inside) ;
lexformat lexbuf}
| '#' ['1'-'9']
{let lxm = lexeme lexbuf in
let i = Char.code (lxm.[1]) - Char.code '1' in
Lexstate.scan_arg (scan_this_arg lexformat) i ;
lexformat lexbuf}
| eof
{if Stack.empty stack_lexbuf then
()
else
let lexbuf = previous_lexbuf () in
lexformat lexbuf}
| "" {tfone lexbuf ; lexformat lexbuf}
{
open Parse_opts
let main {arg=s ; subst=env} =
if !verbose > 1 then prerr_endline ("Table format: "^s);
let s =
if String.length s > 0 && s.[0] = '\\' then
match Latexmacros.find s with
| _, Lexstate.Subst s -> s
| _,_ -> s
else
s in
start_normal env ;
lexformat (Lexing.from_string s) ;
end_normal () ;
let r = check_vert (trim out_table) in
begin match !destination with
| (Text | Info) -> check_length r
| Html -> ()
end ;
if !verbose > 1 then begin
prerr_string "Format parsed: " ;
pretty_formats r ;
prerr_endline ""
end ;
r
}