HTMLFromTeXBooks/lib/mathgen.ml at master · vanilla-extracts/HTMLFromTeXBooks · GitHub

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(**Unparsing to generate math latex to be interpreted on the web*)

open Parser

(**Generate a command with its name and list of parameters*)
let generate_latex_command s l =
  let line = "\\" ^ s in
  let args = String.concat "," l in
  let line = if args = "" then line else Printf.sprintf "%s[%s]" line args in
  line

(**Generate latex again for commands*)
let generate_latex l =
  let rec unparse acc l =
    match l with
    | [] -> String.concat " " acc
    | Line s :: q -> unparse (s :: acc) q
    | AtomicCmd (s, l) :: q ->
        let line = generate_latex_command s l in
        unparse (line :: acc) q
    | OneArgCmd (s, l, l2) :: q ->
        let line = generate_latex_command s l in
        let line = Printf.sprintf "%s{%s}" line (unparse [] l2) in
        unparse (line :: acc) q
    | MultipleArgCmd (s, l, l2) :: q ->
        let line = generate_latex_command s l in
        let l = List.map (unparse []) l2 in
        let line = Printf.sprintf "%s{%s}" line (String.concat "\n" l) in
        unparse (line :: acc) q
    | _ :: q -> unparse acc q
  in
  unparse [] l

(**Recalculate the environments accounting align,align*,equation,equation* *)
let re_calculate_env ast =
  let rec aux acc ast =
    match ast with
    | [] -> acc
    | Env (s, n) :: q when s = "align" ->
        aux
          (Math
             (Printf.sprintf "\\begin{align}%s\\end{align}" (generate_latex n))
          :: acc)
          q
    | Env (s, n) :: q when s = "align*" ->
        aux
          (Math
             (Printf.sprintf "\\begin{align*}%s\\end{align*}" (generate_latex n))
          :: acc)
          q
    | Env (s, n) :: q when s = "equation" ->
        aux
          (Math
             (Printf.sprintf "\\begin{equation}%s\\end{equation}"
                (generate_latex n))
          :: acc)
          q
    | Env (s, n) :: q when s = "equation*" ->
        aux
          (Math
             (Printf.sprintf "\\begin{equation*}%s\\end{equation*}"
                (generate_latex n))
          :: acc)
          q
    | Env (s, n) :: q ->
        let ast = aux [] n in
        let ast = List.rev ast in
        let env = Env (s, ast) in
        aux (env :: acc) q
    | Chapter (s, l) :: q ->
        let ast = aux [] l in
        let ast = List.rev ast in
        let c = Chapter (s, ast) in
        aux (c :: acc) q
    | Section (s, l) :: q ->
        let ast = aux [] l in
        let ast = List.rev ast in
        let c = Section (s, ast) in
        aux (c :: acc) q
    | Subsection (s, l) :: q ->
        let ast = aux [] l in
        let ast = List.rev ast in
        let c = Subsection (s, ast) in
        aux (c :: acc) q
    | Subsubsection (s, l) :: q ->
        let ast = aux [] l in
        let ast = List.rev ast in
        let c = Subsubsection (s, ast) in
        aux (c :: acc) q
    | e :: q -> aux (e :: acc) q
  in
  List.rev (aux [] ast)