CristalCaveGem » LustreC

open Basetypes

open Corelang

open Datatype

open LustreSpec

open Str

open Yojson

open Basic

module type ParseExt =

sig

  val parse_condition : json -> Condition.t

  val parse_action    : json -> Action.t

  val parse_event     : json -> Basetypes.event_t

end

module Parser (Ext : ParseExt) =

struct

  exception JSON_parse_error of string

  let path_split = String.split_on_char '/'

  let path_concat = String.concat (String.make 1 '/')

  open Util

  let to_list json =

    try

      json |> to_list

    with

      Type_error _ -> [ json ]

  let rec parse_prog json : prog_t =

    Logs.info  (fun m -> m "parse_prog %s" (json |> member "name" |> to_string));

    Program (

      json |> member "name"        |> to_string,

     (json |> member "states"      |> to_list |> List.map parse_state) @

     (json |> member "junctions"   |> to_list |> List.map parse_junction)

     @

     (json |> member "sffunctions" |> to_list |> List.map

        (fun res -> SFFunction (parse_prog res))),

      json |> member "data"        |> to_list |> List.map parse_variable

    )

  and parse_state json =

    Logs.debug (fun m -> m "parse_state");

    State (

      json |> member "path" |> parse_path,

      json |> parse_state_def

    )

  and parse_path json =

    Logs.debug (fun m -> m "parse_path %s" (json |> to_string));

    json |> to_string |> path_split

  and parse_state_def json =

    Logs.debug (fun m -> m "parse_state_def");

    {

      state_actions        = json |> member "state_actions"        |> parse_state_actions;

      outer_trans          = json |> member "outer_trans"          |> to_list |> List.map parse_transition;

      inner_trans          = json |> member "inner_trans"          |> to_list |> List.map parse_transition;

      internal_composition = json |> member "internal_composition" |> parse_internal_composition

    }

  and parse_state_actions json =

    Logs.debug (fun m -> m "parse_state_actions");

    {

      entry_act  = json |> member "entry_act"  |> Ext.parse_action;

      during_act = json |> member "during_act" |> Ext.parse_action;

      exit_act   = json |> member "exit_act"   |> Ext.parse_action;

    }

  and parse_transition json =

    Logs.debug (fun m -> m "parse_transition");

    {

      event          = json |> member "event"          |> Ext.parse_event;

      condition      = json |> member "condition"      |> Ext.parse_condition;

      condition_act  = json |> member "condition_act"  |> Ext.parse_action;

      transition_act = json |> member "transition_act" |> Ext.parse_action;

      dest           = json |> member "dest"           |> parse_dest

    }

  and parse_dest json =

    Logs.debug (fun m -> m "parse_dest");

    let dest_type = json |> member "type" |> to_string in

    (dest_type |>

	(function

	| "State"    -> (fun p -> DPath p)

	| "Junction" -> (fun j -> DJunction (path_concat j))

	| _ -> raise (JSON_parse_error ("Invalid destination type: " ^ dest_type))))

      (json |> member "name" |> parse_path)

  and parse_internal_composition json =

    Logs.debug (fun m -> m "parse_internal_composition");

    let state_type = json |> member "type" |> to_string in

    (state_type |>

	(function

	| "EXCLUSIVE_OR" -> (fun tinit substates ->                      Or  (tinit, substates))

	| "PARALLEL_AND" -> (fun tinit substates -> assert (tinit = []); And (substates))

        | _ -> raise (JSON_parse_error ("Invalid state type: " ^ state_type))))

      (json |> member "tinit"     |> parse_tinit)

      (json |> member "substates" |> to_list |> List.map to_string)

  and parse_tinit json =

    Logs.debug (fun m -> m "parse_tinit");

    json |> to_list |> List.map parse_transition

  and parse_junction json =

    Logs.debug (fun m -> m "parse_junction");

    Junction (

      json |> member "path"        |> to_string,

      json |> member "outer_trans" |> to_list |> List.map parse_transition

    )

  and scope_of_string s =

    match s with

    | "Constant"  -> Constant

    | "Input"     -> Input

    | "Local"     -> Local

    | "Output"    -> Output

    | "Parameter" -> Parameter

    | _           -> raise (JSON_parse_error ("Invalid scope for variable: " ^ s))

  and parse_real_value s =

    Logs.debug (fun m -> m "parse_real_value %s" s);

    let real_regexp_simp = regexp "\\(-?[0-9][0-9]*\\)\\.\\([0-9]*\\)" in

    let real_regexp_e    = regexp "\\(-?[0-9][0-9]*\\)\\.\\([0-9]*\\)\\(E\\|e\\)\\(\\(\\+\\|\\-\\)[0-9][0-9]*\\)" in

    if string_match real_regexp_e s 0 then

      let l = matched_group 1 s in

      let r = matched_group 2 s in

      let e = matched_group 4 s in

      Const_real (Num.num_of_string (l ^ r),

                  String.length r + (-1 * int_of_string e),

                  s)

    else

    if string_match real_regexp_simp s 0 then

      let l = matched_group 1 s in

      let r = matched_group 2 s in

      Const_real (Num.num_of_string (l ^ r), String.length r, s)

    else

      raise (JSON_parse_error ("Invalid real constant " ^ s))

  and lustre_datatype_of_json json location =

    let datatype      = json |> member "datatype"      |> to_string in

    let initial_value = json |> member "initial_value" |> to_string in

    match datatype with

    | "bool" -> (Tydec_bool, mkexpr location

                   (Expr_const (Const_tag

                                  ((fun s -> match s with

                                     | "true"  -> tag_true

                                     | "false" -> tag_false

                                     | _       ->

                                       raise (JSON_parse_error ("Invalid constant for

     boolean: " ^ s))) initial_value))))

    | "int"  -> (Tydec_int, mkexpr location

                   (Expr_const (Const_int (int_of_string

                                             initial_value))))

    | "real" -> (Tydec_real, mkexpr location

                   (Expr_const (parse_real_value initial_value)))

    | _      -> raise (JSON_parse_error ("Invalid datatype " ^ datatype

                                         ^ " for variable " ^ (json |> member "name"

                                                               |> to_string)))

  and parse_variable json =

    Logs.debug (fun m -> m "parse_variable %s" (json |> member "name" |> to_string));

    let location                  = Location.dummy_loc in

    let (datatype, initial_value) = lustre_datatype_of_json json location in

    mkvar_decl location ~orig:true

      ( json |> member "name" |> to_string,

        {ty_dec_desc = datatype;  ty_dec_loc = location},

        {ck_dec_desc = Ckdec_any; ck_dec_loc = location},

        true,

        Some initial_value

      )

end