mirror of
https://gitlab.com/scemama/QCaml.git
synced 2024-11-18 12:03:40 +01:00
417 lines
10 KiB
Org Mode
417 lines
10 KiB
Org Mode
#+begin_src elisp tangle: no :results none :exports none
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(setq pwd (file-name-directory buffer-file-name))
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(setq name (file-name-nondirectory (substring buffer-file-name 0 -4)))
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(setq lib (concat pwd "lib/"))
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(setq testdir (concat pwd "test/"))
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(setq mli (concat lib name ".mli"))
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(setq ml (concat lib name ".ml"))
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(setq test-ml (concat testdir name ".ml"))
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(org-babel-tangle)
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#+end_src
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* Nuclei
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:PROPERTIES:
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:header-args: :noweb yes :comments both
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:END:
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** Type
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#+NAME: types
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#+begin_src ocaml :tangle (eval mli)
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open Common
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type t = (Element.t * Coordinate.t) array
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#+end_src
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#+begin_src ocaml :tangle (eval ml) :exports none
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open Common
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type t = (Element.t * Coordinate.t) array
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open Xyz_ast
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#+end_src
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** xyz file lexer/parser
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*** Lexer =nuclei_lexer.mll= contains the description of the lexemes used in
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an xyz file.
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#+begin_src ocaml :tangle lib/nuclei_lexer.mll :export none
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{
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open Xyz_parser
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}
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let eol = ['\n']
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let white = [' ' '\t']+
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let word = [^' ' '\t' '\n']+
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let letter = ['A'-'Z' 'a'-'z']
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let integer = ['0'-'9']+
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let real = '-'? (integer '.' integer | integer '.' | '.' integer) (['e' 'E'] ('+'|'-')? integer)?
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rule read_all = parse
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| eof { EOF }
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| eol { EOL }
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| white as w { SPACE w }
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| integer as i { INTEGER (int_of_string i) }
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| real as f { FLOAT (float_of_string f) }
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| word as w { WORD w }
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{
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(* DEBUG
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let () =
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let ic = open_in "h2o.xyz" in
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let lexbuf = Lexing.from_channel ic in
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while true do
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let s =
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match read_all lexbuf with
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| EOL -> "EOL"
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| SPACE w -> "SPACE("^w^")"
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| INTEGER i -> "INTEGER("^(string_of_int i)^")"
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| FLOAT f -> "FLOAT("^(string_of_float f)^")"
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| WORD w -> "WORD("^w^")"
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| EOF -> "EOF"
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in
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print_endline s
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done;
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*)
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}
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#+end_src
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*** Parser =xyz_parser.mly= parses nuclear coordinates in xyz format.
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#+begin_src ocaml :tangle lib/xyz_parser.mly :export none :comments none
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%{
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open Common
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let make_angstrom x y z =
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Coordinate.(make_angstrom {
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x ; y ; z
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})
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let output_of f x y z =
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let a = make_angstrom x y z in
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fun e ->
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{
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Xyz_ast.
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element = f e;
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coord = a ;
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}
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let output_of_string = output_of Element.of_string
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let output_of_int = output_of Element.of_int
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%}
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%token EOL
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%token <string> SPACE
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%token <string> WORD
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%token <int> INTEGER
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%token <float> FLOAT
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%token EOF
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%start input
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%type <Xyz_ast.xyz_file> input
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%% /* Grammar rules and actions follow */
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input:
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| integer title atoms_xyz {
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{
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number_of_atoms = $1;
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file_title = $2;
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nuclei = $3;
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}
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}
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;
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integer:
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| INTEGER EOL { $1 }
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| INTEGER SPACE EOL { $1 }
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| SPACE INTEGER EOL { $2 }
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| SPACE INTEGER SPACE EOL { $2 }
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;
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title:
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| title_list EOL { $1 }
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;
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text:
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| WORD { $1 }
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| SPACE { $1 }
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| FLOAT { (string_of_float $1)}
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| INTEGER { (string_of_int $1)}
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;
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title_list:
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| { "" }
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| title_list text { ($1 ^ $2) }
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;
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atoms_xyz:
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| atoms_list EOL { List.rev $1 }
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| atoms_list EOF { List.rev $1 }
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;
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atoms_list:
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| { [] }
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| atoms_list WORD SPACE FLOAT SPACE FLOAT SPACE FLOAT EOL { output_of_string $4 $6 $8 $2 :: $1 }
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| atoms_list WORD SPACE FLOAT SPACE FLOAT SPACE FLOAT SPACE EOL { output_of_string $4 $6 $8 $2 :: $1 }
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| atoms_list INTEGER SPACE FLOAT SPACE FLOAT SPACE FLOAT EOL { output_of_int $4 $6 $8 $2 :: $1 }
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| atoms_list INTEGER SPACE FLOAT SPACE FLOAT SPACE FLOAT SPACE EOL { output_of_int $4 $6 $8 $2 :: $1 }
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| atoms_list SPACE WORD SPACE FLOAT SPACE FLOAT SPACE FLOAT EOL { output_of_string $5 $7 $9 $3 :: $1 }
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| atoms_list SPACE WORD SPACE FLOAT SPACE FLOAT SPACE FLOAT SPACE EOL { output_of_string $5 $7 $9 $3 :: $1 }
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| atoms_list SPACE INTEGER SPACE FLOAT SPACE FLOAT SPACE FLOAT EOL { output_of_int $5 $7 $9 $3 :: $1 }
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| atoms_list SPACE INTEGER SPACE FLOAT SPACE FLOAT SPACE FLOAT SPACE EOL { output_of_int $5 $7 $9 $3 :: $1 }
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;
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#+end_src
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When an xyz file is read by =xyz_parser.mly=, it is converted into
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an ~xyz_file~ data structure.
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#+begin_src ocaml :tangle lib/xyz_ast.mli
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open Common
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type nucleus =
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{
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element: Element.t ;
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coord : Coordinate.angstrom Coordinate.point;
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}
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type xyz_file =
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{
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number_of_atoms : int ;
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file_title : string ;
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nuclei : nucleus list ;
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}
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#+end_src
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** Conversion
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#+begin_src ocaml :tangle (eval mli)
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val of_xyz_string : string -> t
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val to_xyz_string : t -> string
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val of_xyz_file : string -> t
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val of_zmt_string : string -> t
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val of_zmt_file : string -> t
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val to_string : t -> string
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val of_filename : string -> t
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#+end_src
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| ~of_xyz_string~ | Create from a string, in xyz format |
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| ~of_xyz_file~ | Create from a file, in xyz format |
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| ~of_zmt_string~ | Create from a string, in z-matrix format |
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| ~of_zmt_file~ | Create from a file, in z-matrix format |
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| ~to_string~ | Transform to a string, for printing |
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| ~of_filename~ | Detects the type of file (xyz, z-matrix) and reads the file |
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#+begin_src ocaml :tangle (eval ml) :exports none
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let of_xyz_lexbuf lexbuf =
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let data =
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Xyz_parser.input Nuclei_lexer.read_all lexbuf
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in
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let len = List.length data.nuclei in
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if len <> data.number_of_atoms then
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Printf.sprintf "Error: expected %d atoms but %d read"
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data.number_of_atoms len
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|> failwith;
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List.map (fun nucleus ->
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nucleus.element, Coordinate.angstrom_to_bohr nucleus.coord
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) data.nuclei
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|> Array.of_list
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let of_xyz_string input_string =
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Lexing.from_string input_string
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|> of_xyz_lexbuf
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let of_xyz_file filename =
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let ic = open_in filename in
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let lexbuf =
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Lexing.from_channel ic
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in
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let result =
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of_xyz_lexbuf lexbuf
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in
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close_in ic;
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result
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let of_zmt_string buffer =
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Zmatrix.of_string buffer
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|> Zmatrix.to_xyz
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|> Array.map (fun (e,x,y,z) ->
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(e, Coordinate.(angstrom_to_bohr @@ make_angstrom { x ; y ; z} ))
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)
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let of_zmt_file filename =
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let ic = open_in filename in
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let rec aux accu =
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try
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let line = input_line ic in
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aux (line::accu)
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with End_of_file ->
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close_in ic;
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List.rev accu
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|> String.concat "\n"
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in aux []
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|> of_zmt_string
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let to_string atoms =
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"
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Nuclear Coordinates (Angstrom)
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------------------------------
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-----------------------------------------------------------------------
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Center Atomic Element Coordinates (Angstroms)
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Number X Y Z
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-----------------------------------------------------------------------
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" ^
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(Array.mapi (fun i (e, coord) ->
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let open Coordinate in
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let coord =
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bohr_to_angstrom coord
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in
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Printf.sprintf " %5d %5d %5s %12.6f %12.6f %12.6f"
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(i+1) (Element.to_int e) (Element.to_string e)
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coord.x coord.y coord.z
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) atoms
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|> Array.to_list
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|> String.concat "\n" ) ^
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"
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-----------------------------------------------------------------------
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"
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let of_filename filename =
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of_xyz_file filename
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let to_xyz_string t =
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[ string_of_int (Array.length t) ; "" ] @
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( Array.map (fun (e, coord) ->
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let open Coordinate in
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let coord =
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bohr_to_angstrom coord
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in
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Printf.sprintf " %5s %12.6f %12.6f %12.6f"
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(Element.to_string e) coord.x coord.y coord.z
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) t
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|> Array.to_list )
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|> String.concat "\n"
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#+end_src
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** TODO Query
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#+begin_src ocaml :tangle (eval mli)
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val formula : t -> string
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val repulsion : t -> float
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val charge : t -> Charge.t
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val small_core : t -> int
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val large_core : t -> int
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#+end_src
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| ~formula~ | Returns the chemical formula |
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| ~repulsion~ | Nuclear repulsion energy, in atomic units |
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| ~charge~ | Sum of the charges of the nuclei |
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| ~small_core~ | Number of core electrons in the small core model |
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| ~large_core~ | Number of core electrons in the large core model |
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#+begin_src ocaml :tangle (eval ml) :exports none
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let formula t =
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let dict = Hashtbl.create 67 in
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Array.iter (fun (e,_) ->
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let e = Element.to_string e in
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let value =
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try (Hashtbl.find dict e) + 1
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with Not_found -> 1
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in
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Hashtbl.replace dict e value
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) t;
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Hashtbl.to_seq_keys dict
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|> List.of_seq
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|> List.sort String.compare
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|> List.fold_left (fun accu key ->
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let x = Hashtbl.find dict key in
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accu ^ key ^ "_{" ^ (string_of_int x) ^ "}") ""
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let repulsion nuclei =
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let get_charge e =
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Element.to_charge e
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|> Charge.to_float
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in
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Array.fold_left ( fun accu (e1, coord1) ->
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accu +.
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Array.fold_left (fun accu (e2, coord2) ->
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let r = Coordinate.(norm (coord1 |- coord2)) in
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if r > 0. then
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accu +. 0.5 *. (get_charge e2) *. (get_charge e1) /. r
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else accu
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) 0. nuclei
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) 0. nuclei
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let charge nuclei =
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Array.fold_left (fun accu (e, _) -> accu + Charge.to_int (Element.to_charge e) )
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0 nuclei
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|> Charge.of_int
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let small_core a =
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Array.fold_left (fun accu (e,_) -> accu + (Element.small_core e)) 0 a
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let large_core a =
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Array.fold_left (fun accu (e,_) -> accu + (Element.large_core e)) 0 a
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#+end_src
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** Printers
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#+begin_src ocaml :tangle (eval mli)
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val pp : Format.formatter -> t -> unit
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#+end_src
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#+begin_src ocaml :tangle (eval ml) :exports none
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let pp ppf t =
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Format.fprintf ppf "@[%s@]" (to_string t)
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#+end_src
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** Tests
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#+begin_src ocaml :tangle (eval test-ml) :exports none
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open Common
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open Particles
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open Alcotest
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let wd = Common.Qcaml.root ^ Filename.dir_sep ^ "test"
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let test_xyz molecule length repulsion charge core =
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let xyz = Nuclei.of_xyz_file (wd^Filename.dir_sep^molecule^".xyz") in
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check int "length" length (Array.length xyz);
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check (float 1.e-4) "repulsion" repulsion (Nuclei.repulsion xyz);
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check int "charge" charge (Charge.to_int @@ Nuclei.charge xyz);
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check int "small_core" core (Nuclei.small_core xyz);
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()
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let tests = [
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"caffeine", `Quick, (fun () -> test_xyz "caffeine" 24 917.0684 102 28);
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"water", `Quick, (fun () -> test_xyz "water" 3 9.19497 10 2);
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]
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#+end_src
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