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|
/*****************************************************************************/
/* libCUDF - CUDF (Common Upgrade Description Format) manipulation library */
/* Copyright (C) 2009-2012 Stefano Zacchiroli <zack@upsilon.cc> */
/* */
/* This library is free software: you can redistribute it and/or modify */
/* it under the terms of the GNU Lesser General Public License as */
/* published by the Free Software Foundation, either version 3 of the */
/* License, or (at your option) any later version. A special linking */
/* exception to the GNU Lesser General Public License applies to this */
/* library, see the COPYING file for more information. */
/*****************************************************************************/
/* CUDF type parser: parse values belonging to CUDF types.
Used as the basic building block to parse CUDF stanzas retuned by
Cudf_822_paser. Generally, this parser does not need to parse multi-line
values (as they are all normalized to single-line values by
Cudf_822_parser.)
*/
%{
(** a non-located parse error carrying an error message (...) *)
exception Parse_error_msg of string
let parse_relop = function
| "=" -> `Eq
| "!=" -> `Neq
| ">=" -> `Geq
| ">" -> `Gt
| "<=" -> `Leq
| "<" -> `Lt
| _ -> assert false (* lexer shouldn't have returned such a RELOP! *)
(** parse a type declaration with no default value *)
let parse_typename = function
| "int" -> `Int
| "posint" -> `Posint
| "nat" -> `Nat
| "bool" -> `Bool
| "string" -> `String
| "pkgname" -> `Pkgname
| "ident" -> `Ident
| "vpkg" -> `Vpkg
| "vpkgformula" -> `Vpkgformula
| "vpkglist" -> `Vpkglist
| "veqpkg" -> `Veqpkg
| "veqpkglist" -> `Veqpkglist
| s -> raise (Parse_error_msg ("unknown type name: " ^ s))
%}
%token <string> IDENT PKGNAME QSTRING RELOP
%token <string> POSINT NEGINT
%token LBRACKET RBRACKET LPAREN RPAREN
%token COMMA PIPE COLON EQ
%token VPKGTRUE VPKGFALSE
%token EOL
%type <int> int_top
%type <string> ident_top qstring_top
%type <Cudf_types.pkgname> pkgname_top
%type <Cudf_types.vpkg> vpkg_top
%type <Cudf_types.vpkglist> vpkglist_top
%type <Cudf_types.vpkgformula> vpkgformula_top
%type <Cudf_types.typedecl> typedecl_top
%type <Cudf_types.typ> type_top
%start int_top ident_top qstring_top pkgname_top type_top
%start vpkg_top vpkglist_top vpkgformula_top typedecl_top
%%
int_top: int EOL { $1 } ;
ident_top: ident EOL { $1 } ;
qstring_top: qstring EOL { $1 } ;
pkgname_top: pkgname EOL { $1 } ;
vpkg_top: vpkg EOL { $1 } ;
vpkglist_top: vpkglist EOL { $1 } ;
vpkgformula_top: vpkgformula EOL { $1 } ;
typedecl_top: typedecl EOL { $1 } ;
type_top: type_ EOL { $1 } ;
ident: IDENT { $1 } ;
qstring: QSTRING { $1 } ;
version: POSINT { int_of_string $1 } ;
pkgname:
| PKGNAME { $1 }
| IDENT { $1 }
| POSINT { $1 }
| NEGINT { $1 }
;
relop:
| RELOP { parse_relop $1 }
| EQ { `Eq }
;
int:
| POSINT { int_of_string $1 }
| NEGINT { int_of_string $1 }
;
vpkg:
| pkgname { ($1, None) }
| pkgname relop version { ($1, Some ($2, $3)) }
;
vpkglist:
| { [] }
| vpkglist_ne { $1 }
;
vpkglist_ne:
| vpkg { [ $1 ] }
| vpkg COMMA vpkglist_ne { $1 :: $3 }
;
vpkgformula:
| and_formula { $1 }
| VPKGTRUE { [] }
| VPKGFALSE { [ [] ] }
;
and_formula:
| or_formula { [ $1 ] }
| or_formula COMMA and_formula { $1 :: $3 }
;
or_formula:
| vpkg { [ $1 ] }
| vpkg PIPE or_formula { $1 :: $3 }
;
/* non trivial formula, i.e. a formula based which is syntactially different from
both an integer and an identifier */
vpkgformula_ntriv:
| and_formula_ntriv { $1 }
| VPKGTRUE { [] }
| VPKGFALSE { [ [] ] }
;
and_formula_ntriv:
| or_formula_ntriv { [ $1 ] }
| or_formula COMMA and_formula { $1 :: $3 }
;
or_formula_ntriv:
| vpkg_ntriv { [ $1 ] }
| vpkg PIPE or_formula { $1 :: $3 }
;
vpkg_ntriv:
| PKGNAME { ($1, None) }
| pkgname relop version { ($1, Some ($2, $3)) }
;
typedecl:
| { [] }
| typedecl_ne { $1 }
;
typedecl_ne:
| typedecl_ { [ $1 ] }
| typedecl_ COMMA typedecl_ne { $1 :: $3 }
;
typedecl_:
| ident COLON type_ { ($1, Cudf_types.typedecl_of_type $3) }
| ident COLON type_
EQ LBRACKET typed_value RBRACKET { let name, typ, v = $1, $3, $6 in
(name,
Cudf_types.typedecl_of_value
(Cudf_types.cast typ v)) }
;
type_:
| ident { parse_typename $1 }
| ident LBRACKET enums RBRACKET { if $1 = "enum"
then `Enum $3
else raise Parsing.Parse_error }
;
enums:
| ident { [ $1 ] }
| ident COMMA enums { $1 :: $3 }
;
typed_value:
| { `Vpkglist [] }
| ident { `Ident $1 }
| int { `Int $1 }
| qstring { `String $1 }
| vpkgformula_ntriv { `Vpkgformula $1 }
;
%%
open ExtLib
let error_wrapper f =
fun lexer lexbuf ->
let syntax_error msg =
raise (Cudf_types.Syntax_error (msg, Cudf_types.loc_of_lexbuf lexbuf)) in
try
f lexer lexbuf
with
| Parsing.Parse_error -> syntax_error "parse error"
| Failure _m when String.starts_with _m "lexing" ->
syntax_error "lexer error"
| Cudf_types.Type_error _ -> syntax_error "type error"
| Parse_error_msg msg -> syntax_error msg
let int_top = error_wrapper int_top
let ident_top = error_wrapper ident_top
let pkgname_top = error_wrapper pkgname_top
let vpkg_top = error_wrapper vpkg_top
let vpkglist_top = error_wrapper vpkglist_top
let vpkgformula_top = error_wrapper vpkgformula_top
let typedecl_top = error_wrapper typedecl_top
let qstring_top = error_wrapper qstring_top
let type_top = error_wrapper type_top
|
