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|
%{
module T = Qsp_syntax.T
open StdLabels
type action_block =
{ loc : Qsp_syntax.S.pos
; expression :
Analyzer.Expression.t'
; body : Analyzer.Instruction.t list
; pos : Qsp_syntax.S.pos
; clauses : (
( (Analyzer.Expression.t', Analyzer.Instruction.t) Qsp_syntax.S.clause list
* (Qsp_syntax.S.pos * Analyzer.Instruction.t list) option
) option )
}
module Helper = Qsp_syntax.S.Helper(Analyzer.Expression)
%}
%parameter<Analyzer: Qsp_syntax.S.Analyzer>
%start <(Analyzer.context -> Analyzer.Location.t)>main
%on_error_reduce expression instruction unary_operator assignation_operator
%%
main:
| before_location*
start_location
EOL+
instructions = line_statement*
LOCATION_END
{
let instructions = List.map instructions ~f:(Analyzer.Instruction.v) in
fun context -> Analyzer.Location.location context $loc instructions
}
before_location:
| EOL {}
| COMMENT EOL { }
(* Defer the registration here, and ensure we get a valid rule. *)
start_location:
| l = LOCATION_START
{
ignore (l ())
}
(* All these statement should terminate with EOL *)
line_statement:
| COMMENT EOL+ { Analyzer.Instruction.comment $loc }
| COLUMN i=IDENT EOL* { Analyzer.Instruction.location $loc i }
| s = terminated(instruction, line_sep)
| s = terminated(inline_action, line_sep)
{ s }
| a = action_bloc(IF, elif_else_body)
{ let {loc; expression; body; pos; clauses } = a in
let elifs, else_ = match clauses with
| None -> [], None
| Some (elifs, else_) -> (elifs, else_)
in
Analyzer.Instruction.if_
loc
(pos, expression, body)
~elifs
~else_
}
| a = action_bloc(ACT, empty_body)
{ let {loc; expression; body; _} = a in
Analyzer.Instruction.act loc ~label:expression body
}
(** Represent an instruction which can either be on a single line,
or created in a block until an END
*)
%inline action_bloc(TOKEN, BODY):
| TOKEN
e = expression
COLUMN EOL+
s = line_statement*
b = BODY
END
line_sep
{
let expression = Analyzer.Expression.v e in
let clauses = match b with
| None -> None
| Some (elifs, clauses) ->
let elifs = begin match elifs with
| [] -> []
| _ ->
List.map elifs
~f:(fun ((pos:Qsp_syntax.S.pos), e, instructions) ->
let e = Analyzer.Expression.v e in
(pos, e, instructions)
)
end in
Some (elifs, clauses)
in
{ loc = $loc
; expression
; body = s
; clauses
; pos = $loc(s)
}
}
empty_body:
| { None }
elif:
| ELIF
e = expression
COLUMN EOL+
s = line_statement*
{ $loc, e, s }
else_:
| ELSE EOL+
expressions = line_statement*
{ Some ($loc, expressions) }
| { None }
elif_else_body:
| elifs = elif*
else_ = else_
{ Some (elifs, else_) }
%inline line_sep:
| EOL+
| AMPERSAND+ EOL*
{}
|
