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(** This modules weaves the source code and the legislative text together into a document that law
professionals can understand. *)
open Utils
open Literate_common
module A = Surface.Ast
module P = Printf
module R = Re.Pcre
module C = Cli
(** {1 Helpers} *)
(** Converts double lines into HTML newlines. *)
let pre_html (s : string) =
let s = String.trim s in
let doublenewline = R.regexp "\n\n" in
let s = R.substitute ~rex:doublenewline ~subst:(fun _ -> "<br/>\n") s in
s
(** Raise an error if pygments cannot be found *)
let raise_failed_pygments (command : string) (error_code : int) : 'a =
Errors.raise_error
(Printf.sprintf "Weaving to HTML failed: pygmentize command \"%s\" returned with error code %d"
command error_code)
(** Partial application allowing to remove first code lines of [<td class="code">] and
[<td class="linenos">] generated HTML. Basically, remove all code block first lines. *)
let remove_cb_first_lines : string -> string =
R.substitute ~rex:(R.regexp "<pre>.*\n") ~subst:(function _ -> "<pre>\n")
(** Partial application allowing to remove last code lines of [<td class="code">] and
[<td class="linenos">] generated HTML. Basically, remove all code block last lines. *)
let remove_cb_last_lines : string -> string =
R.substitute ~rex:(R.regexp "<.*\n*</pre>") ~subst:(function _ -> "</pre>")
(** Partial application allowing to substitute operators by their unicode representation. *)
let substitute_arithmetics_op : string -> string =
R.substitute ~rex:(R.regexp "!=|<=|>=|--|->|\\*|\\/") ~subst:(function
| "!=" -> "≠"
| "<=" -> "≤"
| ">=" -> "≥"
| "--" -> "—"
| "->" -> "→"
| "*" -> "×"
| "/" -> "÷"
| s -> s)
(** Usage: [wrap_html source_files custom_pygments language fmt wrapped]
Prints an HTML complete page structure around the [wrapped] content. *)
let wrap_html (source_files : string list) (language : Cli.backend_lang) (fmt : Format.formatter)
(wrapped : Format.formatter -> unit) : unit =
let pygments = "pygmentize" in
let css_file = Filename.temp_file "catala_css_pygments" "" in
let pygments_args = [| "-f"; "html"; "-S"; "colorful"; "-a"; ".catala-code" |] in
let cmd =
Format.sprintf "%s %s > %s" pygments (String.concat " " (Array.to_list pygments_args)) css_file
in
let return_code = Sys.command cmd in
if return_code <> 0 then raise_failed_pygments cmd return_code;
let oc = open_in css_file in
let css_as_string = really_input_string oc (in_channel_length oc) in
close_in oc;
Format.fprintf fmt
"<head>\n\
<style>\n\
%s\n\
</style>\n\
<meta http-equiv='Content-Type' content='text/html; charset=utf-8'/>\n\
</head>\n\
<h1>%s<br />\n\
<small>%s Catala version %s</small>\n\
</h1>\n\
<p>\n\
%s\n\
</p>\n\
<ul>\n\
%s\n\
</ul>\n"
css_as_string (literal_title language) (literal_generated_by language) Utils.Cli.version
(literal_source_files language)
(String.concat "\n"
(List.map
(fun filename ->
let mtime = (Unix.stat filename).Unix.st_mtime in
let ltime = Unix.localtime mtime in
let ftime =
Printf.sprintf "%d-%02d-%02d, %d:%02d" (1900 + ltime.Unix.tm_year)
(ltime.Unix.tm_mon + 1) ltime.Unix.tm_mday ltime.Unix.tm_hour ltime.Unix.tm_min
in
Printf.sprintf "<li><tt>%s</tt>, %s %s</li>"
(pre_html (Filename.basename filename))
(literal_last_modification language)
ftime)
source_files));
wrapped fmt
(** Performs syntax highlighting on a piece of code by using Pygments and the special Catala lexer. *)
let pygmentize_code (c : string Pos.marked) (language : C.backend_lang) : string =
C.debug_print (Printf.sprintf "Pygmenting the code chunk %s" (Pos.to_string (Pos.get_position c)));
let temp_file_in = Filename.temp_file "catala_html_pygments" "in" in
let temp_file_out = Filename.temp_file "catala_html_pygments" "out" in
let oc = open_out temp_file_in in
Printf.fprintf oc "%s" (Pos.unmark c);
close_out oc;
let pygments = "pygmentize" in
let pygments_lexer = get_language_extension language in
let pygments_args =
[|
"-l";
pygments_lexer;
"-f";
"html";
"-O";
"style=colorful,anchorlinenos=True,lineanchors=\""
^ Pos.get_file (Pos.get_position c)
^ "\",linenos=table,linenostart="
^ string_of_int (Pos.get_start_line (Pos.get_position c));
"-o";
temp_file_out;
temp_file_in;
|]
in
let cmd = Format.asprintf "%s %s" pygments (String.concat " " (Array.to_list pygments_args)) in
let return_code = Sys.command cmd in
if return_code <> 0 then raise_failed_pygments cmd return_code;
let oc = open_in temp_file_out in
let output = really_input_string oc (in_channel_length oc) in
close_in oc;
let trimmed_output = output |> remove_cb_first_lines |> remove_cb_last_lines in
trimmed_output
(** {1 Weaving} *)
let rec law_structure_to_html (language : C.backend_lang) (fmt : Format.formatter)
(i : A.law_structure) : unit =
match i with
| A.LawText t ->
let t = pre_html t in
if t = "" then () else Format.fprintf fmt "<p class='law-text'>%s</p>" t
| A.CodeBlock (_, c, metadata) ->
let pprinted_c = substitute_arithmetics_op (Pos.unmark c) in
Format.fprintf fmt "<div class='code-wrapper%s'>\n<div class='filename'>%s</div>\n%s\n</div>"
(if metadata then " code-metadata" else "")
(Pos.get_file (Pos.get_position c))
(pygmentize_code (Pos.same_pos_as ("```catala\n" ^ pprinted_c ^ "```") c) language)
| A.LawHeading (heading, children) ->
let h_number = heading.law_heading_precedence + 1 in
Format.fprintf fmt "<h%d class='law-heading'><a href='%s'>%s</a></h%d>\n" h_number
(match (heading.law_heading_id, language) with
| Some id, Fr ->
let ltime = Unix.localtime (Unix.time ()) in
P.sprintf "https://legifrance.gouv.fr/codes/id/%s/%d-%02d-%02d" id
(1900 + ltime.Unix.tm_year) (ltime.Unix.tm_mon + 1) ltime.Unix.tm_mday
| _ -> "#")
(pre_html (Pos.unmark heading.law_heading_name))
h_number;
Format.pp_print_list
~pp_sep:(fun fmt () -> Format.fprintf fmt "\n")
(law_structure_to_html language) fmt children
| A.LawInclude _ -> ()
(** {1 API} *)
let ast_to_html (language : C.backend_lang) (fmt : Format.formatter) (program : A.program) : unit =
Format.pp_print_list
~pp_sep:(fun fmt () -> Format.fprintf fmt "\n\n")
(law_structure_to_html language) fmt program.program_items