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|
(**************************************************************************)
(* Copyright © 2009 Stéphane Glondu <steph@glondu.net> *)
(* *)
(* This program is free software: you can redistribute it and/or modify *)
(* it under the terms of the GNU Affero General Public License as *)
(* published by the Free Software Foundation, either version 3 of the *)
(* License, or (at your option) any later version, with the additional *)
(* exemption that compiling, linking, and/or using OpenSSL is allowed. *)
(* *)
(* This program is distributed in the hope that it will be useful, but *)
(* WITHOUT ANY WARRANTY; without even the implied warranty of *)
(* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *)
(* Affero General Public License for more details. *)
(* *)
(* You should have received a copy of the GNU Affero General Public *)
(* License along with this program. If not, see *)
(* <http://www.gnu.org/licenses/>. *)
(**************************************************************************)
open Printf
open Error
open Types
open Core
open Common
type t = Types.expr
let rec simplify query =
match query with
| EMatch (field, EString package) ->
let packages = String.split_on_char '|' package in
let packages = List.map Re.Pcre.quote packages in
let r_string = String.concat "|" packages in
let rex =
Re.Pcre.re (Printf.sprintf "(^| )(%s)\\s*([,(:<]|$)" r_string)
in
EMatch (field, ERegexp (package, rex))
| EMatch (_, (EDep _ | ERegexp _)) -> query
| Etrue | Efalse | Eauto | ESource | EVersion _ | EString _ | ERegexp _
| EDep _ ->
query
| EMatch (f, e) -> EMatch (f, simplify e)
| EList l -> (
match l with
| [] -> Etrue
| h :: [] -> simplify h
| _ :: _ -> EList (List.map simplify l))
| ENot e -> (
match simplify e with Etrue -> Efalse | Efalse -> Etrue | e -> ENot e)
| EOr (e1, e2) -> (
match (simplify e1, simplify e2) with
| Efalse, e | e, Efalse -> e
| Etrue, _ | _, Etrue -> Etrue
| e1, e2 -> EOr (e1, e2))
| EAnd (e1, e2) -> (
match (simplify e1, simplify e2) with
| Efalse, _ | _, Efalse -> Efalse
| Etrue, e | e, Etrue -> e
| e1, e2 -> EAnd (e1, e2))
let of_expr x = simplify x
let of_string s =
let lexbuf = Lexing.from_string s in
try simplify (Parser.full_expr Lexer.token lexbuf)
with Parser.Error ->
let pos = Lexing.lexeme_start_p lexbuf in
raise
(Parsing_error
( s,
false,
pos.Lexing.pos_lnum,
pos.Lexing.pos_cnum - pos.Lexing.pos_bol ))
let parens show expr = if show then sprintf "(%s)" expr else expr
let rec to_string_b ?(escape = true) last_op = function
| EMatch (f, ERegexp r) -> sprintf ".%s ~ %s" f (string_of_regexp r)
| ENot e -> sprintf "!%s" (to_string_b "!" e)
| Etrue -> sprintf "true"
| Efalse -> sprintf "false"
| EAnd (e1, e2) ->
parens
(last_op <> "&" && last_op <> "")
(sprintf "%s & %s" (to_string_b "&" e1) (to_string_b "&" e2))
| EOr (e1, e2) ->
parens
(last_op <> "|" && last_op <> "")
(sprintf "%s | %s" (to_string_b "|" e1) (to_string_b "|" e2))
| EList xs ->
sprintf "[%s]" (String.concat "; " (List.map (to_string_b "") xs))
| ESource -> "source"
| EString x -> string_of_string escape x
| EVersion (cmp, x) ->
parens (last_op <> "") (sprintf ".%s \"%s\"" (string_of_cmp cmp) x)
| EMatch (field, EDep (package, cmp, ref_version)) ->
parens (last_op <> "")
(sprintf ".%s ~ \"%s\" %s \"%s\"" field package (string_of_cmp cmp)
ref_version)
| EMatch (field, EString package) ->
parens (last_op <> "") (sprintf ".%s ~ \"%s\"" field package)
| _ -> raise (Unexpected_expression "<unable to convert to string>")
let to_string ?(escape = true) = to_string_b ~escape ""
let eval (type a) (kind : a Package.kind) (pkg : a Package.t) =
let rec eval = function
| EMatch (field, ERegexp (_, rex)) -> (
try
let value = Package.get field pkg in
let rex = Re.compile rex in
ignore (Re.Pcre.exec ~rex value);
true
with Not_found -> false)
| Etrue -> true
| Efalse -> false
| ESource -> ( match kind with Source -> true | _ -> false)
| EOr (e1, e2) -> eval e1 || eval e2
| EAnd (e1, e2) -> eval e1 && eval e2
| ENot e -> not (eval e)
| EVersion (cmp, ref_version) ->
let value = Package.get "version" pkg in
Debian_version.compare_predicate cmp value ref_version
| EMatch (field, EDep (package, cmp, refv)) ->
let deps = Package.dependencies field pkg in
List.exists
(fun x ->
x.Package.dep_name = package
&&
match x.Package.dep_version with
| None -> false
| Some (rcmp, rrefv) -> (
match (rcmp, cmp) with
| Ge, Ge | Gt, Ge | Gt, Gt ->
Debian_version.compare rrefv refv >= 0
| Ge, Gt -> Debian_version.compare rrefv refv > 0
| _, _ -> false (* FIXME: missing cases *)))
deps
| EMatch (field, EString package) -> (
try
let deps = Package.dependencies field pkg in
List.exists (fun x -> x.Package.dep_name = package) deps
with Not_found -> false)
| x -> raise (Unexpected_expression (to_string x))
in
eval
let eval_source x = eval Source x
let eval_binary x = eval Binary x
let rec fields accu = function
| EMatch (f, _) -> StringSet.add f accu
| ENot e -> fields accu e
| Etrue | Efalse | Eauto -> accu
| EAnd (e1, e2) | EOr (e1, e2) -> fields (fields accu e1) e2
| EList xs -> List.fold_left fields accu xs
| ESource | EString _ | ERegexp _ | EDep _ -> accu
| EVersion _ -> StringSet.add "version" accu
|
