New regine
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John Whitington
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181
cpdfcommand.ml
181
cpdfcommand.ml
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@ -747,28 +747,22 @@ let cropbox pdf page =
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| None -> page.Pdfpage.mediabox
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| None -> page.Pdfpage.mediabox
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let width box =
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let width box =
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let minx, miny, maxx, maxy = Pdf.parse_rectangle box in
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let minx, miny, maxx, maxy = Pdf.parse_rectangle box in maxx -. minx
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maxx -. minx
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let height box =
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let height box =
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let minx, miny, maxx, maxy = Pdf.parse_rectangle box in
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let minx, miny, maxx, maxy = Pdf.parse_rectangle box in maxy -. miny
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maxy -. miny
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let minx box =
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let minx box =
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let minx, miny, maxx, maxy = Pdf.parse_rectangle box in
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let minx, miny, maxx, maxy = Pdf.parse_rectangle box in minx
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minx
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let miny box =
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let miny box =
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let minx, miny, maxx, maxy = Pdf.parse_rectangle box in
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let minx, miny, maxx, maxy = Pdf.parse_rectangle box in miny
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miny
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let maxx box =
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let maxx box =
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let minx, miny, maxx, maxy = Pdf.parse_rectangle box in
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let minx, miny, maxx, maxy = Pdf.parse_rectangle box in maxx
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maxx
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let maxy box =
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let maxy box =
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let minx, miny, maxx, maxy = Pdf.parse_rectangle box in
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let minx, miny, maxx, maxy = Pdf.parse_rectangle box in maxy
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maxy
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let find_page_width pdf page = width page.Pdfpage.mediabox
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let find_page_width pdf page = width page.Pdfpage.mediabox
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let find_page_height pdf page = height page.Pdfpage.mediabox
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let find_page_height pdf page = height page.Pdfpage.mediabox
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@ -783,28 +777,48 @@ let find_page_crop_miny pdf page = miny (cropbox pdf page)
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let find_page_crop_maxx pdf page = maxx (cropbox pdf page)
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let find_page_crop_maxx pdf page = maxx (cropbox pdf page)
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let find_page_crop_maxy pdf page = maxy (cropbox pdf page)
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let find_page_crop_maxy pdf page = maxy (cropbox pdf page)
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type expr =
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let make_num unt num =
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Num of float
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let f =
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| Add of expr * expr
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match num with
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| Mul of expr * expr
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| Pdfgenlex.LexInt i -> float_of_int i
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| Sub of expr * expr
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| Pdfgenlex.LexReal r -> r
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| Div of expr * expr
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| _ -> failwith "make_num"
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in
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match unt with
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| Pdfgenlex.LexName "pt" -> f
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| Pdfgenlex.LexName "cm" -> cm f
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| Pdfgenlex.LexName "mm" -> mm f
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| Pdfgenlex.LexName "in" -> inch f
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| _ -> failwith "make_num"
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type lexeme =
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let update_last_number unt op num = function
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LNum of float | LAdd | LMul | LSub | LDiv | LParen | RParen
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[] -> []
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| h::t ->
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let final_num = make_num unt num in
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let h' =
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match op with
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Pdfgenlex.LexName "add" -> h +. final_num
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| Pdfgenlex.LexName "sub" -> h -. final_num
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| Pdfgenlex.LexName "mul" -> h *. final_num
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| Pdfgenlex.LexName "div" -> h /. final_num
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| _ -> failwith "update_last_number"
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in
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h'::t
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let string_of_our_lexeme = function
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let find_page_characteristic pdf page = function
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LNum x -> Printf.sprintf "LNum %f" x;
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| Pdfgenlex.LexName "PW" -> find_page_width pdf page
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| LAdd -> Printf.sprintf "LAdd"
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| Pdfgenlex.LexName "PH" -> find_page_height pdf page
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| LMul -> Printf.sprintf "LMul"
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| Pdfgenlex.LexName "CW" -> find_page_crop_width pdf page
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| LSub -> Printf.sprintf "LSub"
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| Pdfgenlex.LexName "CH" -> find_page_crop_height pdf page
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| LDiv -> Printf.sprintf "LDiv"
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| Pdfgenlex.LexName "PMINX" -> find_page_minx pdf page
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| LParen -> Printf.sprintf "LParen"
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| Pdfgenlex.LexName "PMINY" -> find_page_miny pdf page
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| RParen -> Printf.sprintf "RParen"
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| Pdfgenlex.LexName "PMAXX" -> find_page_maxx pdf page
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| Pdfgenlex.LexName "PMAXY" -> find_page_maxy pdf page
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let string_of_our_lexemes lexemes =
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| Pdfgenlex.LexName "CMINX" -> find_page_crop_minx pdf page
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List.fold_left
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| Pdfgenlex.LexName "CMINY" -> find_page_crop_miny pdf page
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(fun x y -> x ^ " " ^ y) "" (List.map string_of_our_lexeme lexemes)
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| Pdfgenlex.LexName "CMAXX" -> find_page_crop_maxx pdf page
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| Pdfgenlex.LexName "CMAXY" -> find_page_crop_maxy pdf page
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| _ -> failwith "find_page_characteristic"
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let rec parse_units_again pdf numbers papersize more =
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let rec parse_units_again pdf numbers papersize more =
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let w, h = points_of_papersize papersize in
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let w, h = points_of_papersize papersize in
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@ -875,100 +889,25 @@ and parse_units pdf numbers = function
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parse_units pdf ((inch <| float_of_int x)::numbers) more
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parse_units pdf ((inch <| float_of_int x)::numbers) more
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| Pdfgenlex.LexReal x::Pdfgenlex.LexName "in"::more ->
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| Pdfgenlex.LexReal x::Pdfgenlex.LexName "in"::more ->
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parse_units pdf (inch x::numbers) more
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parse_units pdf (inch x::numbers) more
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| Pdfgenlex.LexName "PW"::more ->
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parse_units pdf ((find_page_width pdf (firstpage pdf))::numbers) more
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| Pdfgenlex.LexName "PH"::more ->
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parse_units pdf ((find_page_height pdf (firstpage pdf))::numbers) more
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| Pdfgenlex.LexName "CW"::more ->
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parse_units pdf ((find_page_crop_width pdf (firstpage pdf))::numbers) more
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| Pdfgenlex.LexName "CH"::more ->
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parse_units pdf ((find_page_crop_height pdf (firstpage pdf))::numbers) more
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| Pdfgenlex.LexName "PMINX"::more ->
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parse_units pdf ((find_page_minx pdf (firstpage pdf))::numbers) more
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| Pdfgenlex.LexName "PMINY"::more ->
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parse_units pdf ((find_page_miny pdf (firstpage pdf))::numbers) more
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| Pdfgenlex.LexName "PMAXX"::more ->
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parse_units pdf ((find_page_maxx pdf (firstpage pdf))::numbers) more
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| Pdfgenlex.LexName "PMAXY"::more ->
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parse_units pdf ((find_page_maxy pdf (firstpage pdf))::numbers) more
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| Pdfgenlex.LexName "CMINX"::more ->
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parse_units pdf ((find_page_crop_minx pdf (firstpage pdf))::numbers) more
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| Pdfgenlex.LexName "CMINY"::more ->
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parse_units pdf ((find_page_crop_miny pdf (firstpage pdf))::numbers) more
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| Pdfgenlex.LexName "CMAXX"::more ->
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parse_units pdf ((find_page_crop_maxx pdf (firstpage pdf))::numbers) more
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| Pdfgenlex.LexName "CMAXY"::more ->
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parse_units pdf ((find_page_crop_maxy pdf (firstpage pdf))::numbers) more
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| Pdfgenlex.LexInt x::more ->
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| Pdfgenlex.LexInt x::more ->
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parse_units pdf (float_of_int x::numbers) more
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parse_units pdf (float_of_int x::numbers) more
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| Pdfgenlex.LexReal x::more ->
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| Pdfgenlex.LexReal x::more ->
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parse_units pdf (x::numbers) more
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parse_units pdf (x::numbers) more
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| Pdfgenlex.LexName "pt"::more ->
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| Pdfgenlex.LexName "pt"::more ->
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parse_units pdf numbers more
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parse_units pdf numbers more
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| Pdfgenlex.LexName "["::more ->
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| Pdfgenlex.LexName
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(* The beginning of a mathematical expression for one number *)
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( "PW" | "PH" | "CW" | "CH" | "PMINX" | "PMINY" | "PMAXX" | "PMAXY"
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let n, rest = parse_expression pdf more in
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| "CMINX" | "CMINY" | "CMAXX" | "CMAXY") as page_characteristic::more ->
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parse_units pdf (n::numbers) rest
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parse_units
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pdf
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((find_page_characteristic pdf (firstpage pdf) page_characteristic)::numbers)
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more
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| Pdfgenlex.LexName ("add" | "sub" | "mul" | "div") as op::
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((Pdfgenlex.LexInt _ | Pdfgenlex.LexReal _) as num)::
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(Pdfgenlex.LexName ("pt" | "mm" | "cm" | "in") as unt)::more ->
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parse_units pdf (update_last_number unt op num numbers) more
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| _ -> rev numbers
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| _ -> rev numbers
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and really_parse_expression coalesced =
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Printf.printf "%s\n" (string_of_our_lexemes coalesced);
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Num 4.3
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(* Replace +, - by ))+(( etc. Replace * and / by )*( etc. Add (( on left, )) on
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right. Now the expression is correctly parenthesised, as if by magic. This is a
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trick from a very early FORTRAN compiler. *)
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and parenthesise_inner = function
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| (LAdd | LSub) as op::t ->
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RParen::RParen::op::LParen::LParen::parenthesise_inner t
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| (LMul | LDiv) as op::t ->
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RParen::op::LParen::parenthesise_inner t
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| x::t -> x::parenthesise_inner t
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| [] -> []
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and parenthesise lexemes =
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[LParen; LParen] @ parenthesise_inner lexemes @ [RParen; RParen]
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and eval_expr = function
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Num x -> x
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| _ -> failwith "eval_expr"
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and notop = function
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"+" | "-" | "*" | "/" | "(" | ")" -> false
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| _ -> true
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(* We have int/float + an ident [1.6, mm] or [a4portrait] or [PW]. Coalesce those. Now we just have
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operators and operands and parentheses. *)
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and coalesce_lexemes pdf = function
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[] -> []
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| Pdfgenlex.LexName "+"::more -> LAdd::coalesce_lexemes pdf more
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| Pdfgenlex.LexName "-"::more -> LSub::coalesce_lexemes pdf more
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| Pdfgenlex.LexName "/"::more -> LDiv::coalesce_lexemes pdf more
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| Pdfgenlex.LexName "*"::more -> LMul::coalesce_lexemes pdf more
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| Pdfgenlex.LexName "("::more -> LParen::coalesce_lexemes pdf more
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| Pdfgenlex.LexName ")"::more -> RParen::coalesce_lexemes pdf more
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| Pdfgenlex.LexInt a::Pdfgenlex.LexName b::more when notop b ->
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begin match parse_units pdf [] [Pdfgenlex.LexInt a; Pdfgenlex.LexName b] with
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[x] -> LNum x::coalesce_lexemes pdf more
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| _ -> failwith "coalesce_lexemes"
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end
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| Pdfgenlex.LexReal a::Pdfgenlex.LexName b::more when notop b ->
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begin match parse_units pdf [] [Pdfgenlex.LexReal a; Pdfgenlex.LexName b] with
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[x] -> LNum x::coalesce_lexemes pdf more
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| _ -> failwith "coalesce_lexemes"
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end
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| Pdfgenlex.LexInt a::more -> LNum (float_of_int a)::coalesce_lexemes pdf more
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| Pdfgenlex.LexReal a::more -> LNum a::coalesce_lexemes pdf more
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| x -> failwith "coalesce_lexemes: unknown lexemes"
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(* Parse a mathematical expression such as 1 + 2 * %PW *)
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and parse_expression pdf lexemes =
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let lexemes, rest = cleavewhile (neq (Pdfgenlex.LexName "]")) lexemes in
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Printf.printf "%s\n" (Pdfgenlex.string_of_tokens lexemes);
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let our_lexemes = coalesce_lexemes pdf lexemes in
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let expr = really_parse_expression (parenthesise our_lexemes) in
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(eval_expr expr, rest)
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let rec space_units_inner = function
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let rec space_units_inner = function
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| [] -> []
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| [] -> []
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| 'm'::'m'::t -> ' '::'m'::'m'::' '::space_units_inner t
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| 'm'::'m'::t -> ' '::'m'::'m'::' '::space_units_inner t
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@ -981,7 +920,11 @@ let space_units s =
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implode (space_units_inner (explode s))
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implode (space_units_inner (explode s))
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let parse_units_string pdf s =
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let parse_units_string pdf s =
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parse_units pdf [] (Pdfgenlex.lex_string <| space_units s)
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Printf.printf "Parsing string [%s]\n" s;
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let fs = parse_units pdf [] (Pdfgenlex.lex_string <| space_units s) in
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Printf.printf "Got numbers: %s\n"
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(List.fold_left (fun x y -> x ^ " " ^ y) "" (List.map string_of_float fs));
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fs
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let parse_rectangle pdf s =
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let parse_rectangle pdf s =
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try
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try
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