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(**
This module describe the type an analyzer must implement in order to be
used with the parser.
The module is divided in three modules :
- Expression : the finest part of the QSP syntax.
- Instruction : if/act block,
- Location
*)
(** {1 Generic types used in the module } *)
type pos = Lexing.position * Lexing.position
(** The type pos is used to track the starting and ending position for the
given location. *)
type ('a, 'b) variable = { pos : 'a; name : string; index : 'b option }
(** Describe a variable, using the name in capitalized text, and an optionnal
index.
If missing, the index should be considered as [0].*)
type ('a, 'b) clause = pos * 'a * 'b list
(** {1 Checker Signature} *)
(** Represent the evaluation over an expression *)
module type Expression = sig
type t
(** Internal type used in the evaluation *)
type t'
(** External type used outside of the module *)
val v : t -> t'
val ident : (pos, t) variable -> t
(*
Basic values, text, number…
*)
val integer : pos -> string -> t
val literal : pos -> t T.literal list -> t
val function_ : pos -> T.function_ -> t list -> t
(** Call a function. The functions list is hardcoded in lib/lexer.mll *)
val uoperator : pos -> T.uoperator -> t -> t
(** Unary operator like [-123] or [+'Text']*)
val boperator : pos -> T.boperator -> t -> t -> t
(** Binary operator, for a comparaison, or an operation *)
end
module type Instruction = sig
type t
(** Internal type used in the evaluation *)
type t'
(** External type used outside of the module *)
val v : t -> t'
type expression
val call : pos -> T.keywords -> expression list -> t
(** Call for an instruction like [GT] or [*CLR] *)
val location : pos -> string -> t
(** Label for a loop *)
val comment : pos -> t
(** Comment *)
val expression : expression -> t
(** Raw expression *)
val if_ :
pos ->
(expression, t) clause ->
elifs:(expression, t) clause list ->
else_:(pos * t list) option ->
t
val act : pos -> label:expression -> t list -> t
val assign :
pos ->
(pos, expression) variable ->
T.assignation_operator ->
expression ->
t
end
module type Location = sig
type t
type instruction
val v : t -> Report.t list
val location : pos -> instruction list -> t
end
(** {1 Unified module used by the parser } *)
module type Analyzer = sig
module Expression : Expression
module Instruction : Instruction with type expression = Expression.t'
module Location : Location with type instruction = Instruction.t'
end
(** Helper module used in order to convert elements from the differents
representation levels.
Thoses functions are intended to be used in the menhir parser, in order to
limit the code in the mly file.
*)
module Helper (E : sig
type t
(** Internal type used in the evaluation *)
type t'
(** External type used outside of the module *)
val v : t -> t'
end) : sig
val variable : (pos, E.t) variable -> (pos, E.t') variable
(** Convert a variable from the [Expression.t] into [Expression.t'] *)
end = struct
let variable : (pos, E.t) variable -> (pos, E.t') variable =
fun variable -> { variable with index = Option.map E.v variable.index }
end
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