112 lines
2.5 KiB
OCaml
112 lines
2.5 KiB
OCaml
/***********************************************************************/
|
|
/* */
|
|
/* OCaml */
|
|
/* */
|
|
/* Xavier Leroy, projet Cristal, INRIA Rocquencourt */
|
|
/* */
|
|
/* Copyright 1996 Institut National de Recherche en Informatique et */
|
|
/* en Automatique. All rights reserved. This file is distributed */
|
|
/* under the terms of the Q Public License version 1.0. */
|
|
/* */
|
|
/***********************************************************************/
|
|
|
|
/* The grammar for lexer definitions */
|
|
|
|
%{
|
|
open Syntax
|
|
open Gram_aux
|
|
%}
|
|
|
|
%token <string> Tident
|
|
%token <char> Tchar
|
|
%token <string> Tstring
|
|
%token <Syntax.location> Taction
|
|
%token Trule Tparse Tand Tequal Tend Tor Tunderscore Teof Tlbracket Trbracket
|
|
%token Tstar Tmaybe Tplus Tlparen Trparen Tcaret Tdash
|
|
|
|
%left Tor
|
|
%left CONCAT
|
|
%nonassoc Tmaybe
|
|
%left Tstar
|
|
%left Tplus
|
|
|
|
%start lexer_definition
|
|
%type <Syntax.lexer_definition> lexer_definition
|
|
|
|
%%
|
|
|
|
lexer_definition:
|
|
header Trule definition other_definitions Tend
|
|
{ Lexdef($1, $3::(List.rev $4)) }
|
|
;
|
|
header:
|
|
Taction
|
|
{ $1 }
|
|
|
|
|
{ Location(0,0) }
|
|
;
|
|
other_definitions:
|
|
other_definitions Tand definition
|
|
{ $3::$1 }
|
|
|
|
|
{ [] }
|
|
;
|
|
definition:
|
|
Tident Tequal entry
|
|
{ ($1,$3) }
|
|
;
|
|
entry:
|
|
Tparse case rest_of_entry
|
|
{ $2 :: List.rev $3 }
|
|
;
|
|
rest_of_entry:
|
|
rest_of_entry Tor case
|
|
{ $3::$1 }
|
|
|
|
|
{ [] }
|
|
;
|
|
case:
|
|
regexp Taction
|
|
{ ($1,$2) }
|
|
;
|
|
regexp:
|
|
Tunderscore
|
|
{ Characters all_chars }
|
|
| Teof
|
|
{ Characters ['\000'] }
|
|
| Tchar
|
|
{ Characters [$1] }
|
|
| Tstring
|
|
{ regexp_for_string $1 }
|
|
| Tlbracket char_class Trbracket
|
|
{ Characters $2 }
|
|
| regexp Tstar
|
|
{ Repetition $1 }
|
|
| regexp Tmaybe
|
|
{ Alternative($1, Epsilon) }
|
|
| regexp Tplus
|
|
{ Sequence($1, Repetition $1) }
|
|
| regexp Tor regexp
|
|
{ Alternative($1,$3) }
|
|
| regexp regexp %prec CONCAT
|
|
{ Sequence($1,$2) }
|
|
| Tlparen regexp Trparen
|
|
{ $2 }
|
|
;
|
|
char_class:
|
|
Tcaret char_class1
|
|
{ subtract all_chars $2 }
|
|
| char_class1
|
|
{ $1 }
|
|
;
|
|
char_class1:
|
|
Tchar Tdash Tchar
|
|
{ char_class $1 $3 }
|
|
| Tchar
|
|
{ [$1] }
|
|
| char_class char_class %prec CONCAT
|
|
{ $1 @ $2 }
|
|
;
|
|
|
|
%%
|