emacs/admin/grammars/c.by

;;; c.by -- LL grammar for C/C++ language specification
;; Copyright (C) 1999-2021 Free Software Foundation, Inc.
;;
;; Author: Eric M. Ludlam <zappo@gnu.org>
;;         David Ponce <david@dponce.com>
;;         Klaus Berndl <klaus.berndl@sdm.de>
;;
;; This file is part of GNU Emacs.

;; GNU Emacs is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.

;; GNU Emacs 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 General Public License for more details.

;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.

;; TODO:  From Nate Schley
;; >  * Can't parse signature element: "const char* const rmc_ClrTxt"
;; >  * Can't parse signature element: "char* const dellog_ClrTxt"
;; >  * Can't parse signature element: "const char* dellog_SetTxt"
;; >  * Can't parse signature element: "const RmcCmdSSPADetailedStatus& status"
;; >
;; > And FWIW I have seen the following argument cases not handled, even
;; > with no leading/trailing spaces in the split:
;; >
;; >  * Can't parse signature element: "const bool currentAlarmStatus"
;; >  * Can't parse signature element: "unsigned char mode"
;; >  * Can't parse signature element: "TskTimingTask* tsktimingtask"
;; >  * Can't parse signature element: "unsigned char htrStatus"
;; >  * Can't parse signature element: "char trackPower[]"
;; >  * Can't parse signature element: "const RmcCmdMCDetailedStatus& status"
;; >  * Can't parse signature element: "RmcBucStatus* rftBucStatus"

%package semantic-c-by
%provide semantic/bovine/c-by

%{
(declare-function semantic-c-reconstitute-token "semantic/bovine/c"
		  (tokenpart declmods typedecl))
(declare-function semantic-c-reconstitute-template "semantic/bovine/c"
		  (tag specifier))
(declare-function semantic-expand-c-tag "semantic/bovine/c" (tag))
(declare-function semantic-parse-region "semantic"
		  (start end &optional nonterminal depth returnonerror))
}

%languagemode  c-mode c++-mode
%start         declaration
%scopestart    codeblock

%token <punctuation>   HASH       "\\`[#]\\'"
%token <punctuation>   PERIOD     "\\`[.]\\'"
%token <punctuation>   COLON      "\\`[:]\\'"
%token <punctuation>   SEMICOLON  "\\`[;]\\'"
%token <punctuation>   STAR       "\\`[*]\\'"
%token <punctuation>   AMPERSAND  "\\`[&]\\'"
%token <punctuation>   DIVIDE     "\\`[/]\\'"
%token <punctuation>   PLUS       "\\`[+]\\'"
%token <punctuation>   MINUS      "\\`[-]\\'"
%token <punctuation>   BANG       "\\`[!]\\'"
%token <punctuation>   QUESTION   "\\`[?]\\'"
%token <punctuation>   EQUAL      "\\`[=]\\'"
%token <punctuation>   LESS       "\\`[<]\\'"
%token <punctuation>   GREATER    "\\`[>]\\'"
%token <punctuation>   COMA       "\\`[,]\\'"
%token <punctuation>   TILDE      "\\`[~]\\'"
%token <punctuation>   MOD        "\\`[%]\\'"
%token <punctuation>   HAT        "\\`\\^\\'"
%token <punctuation>   OR         "\\`[|]\\'"
%token <string>        C          "\"C\""
%token <string>        CPP        "\"C\\+\\+\""
%token <number>        ZERO       "^0$"
%token <symbol>        RESTRICT   "\\<\\(__\\)?restrict\\>"
%token <open-paren>    LPAREN     "("
%token <close-paren>   RPAREN     ")"
%token <open-paren>    LBRACE     "{"
%token <close-paren>   RBRACE     "}"
%token <semantic-list> BRACK_BLCK "\\[.*\\]$"
%token <semantic-list> PAREN_BLCK "^("
%token <semantic-list> BRACE_BLCK "^{"
%token <semantic-list> VOID_BLCK  "^(void)$"
%token <semantic-list> PARENS     "()"
%token <semantic-list> BRACKETS   "\\[\\]"

%token EXTERN "extern"
%put EXTERN summary "Declaration Modifier: extern <type> <name> ..."
%token STATIC "static"
%put STATIC summary "Declaration Modifier: static <type> <name> ..."
%token CONST "const"
%put CONST summary "Declaration Modifier: const <type> <name> ..."
%token VOLATILE "volatile"
%put VOLATILE summary "Declaration Modifier: volatile <type> <name> ..."
%token REGISTER "register"
%put REGISTER summary "Declaration Modifier: register <type> <name> ..."
%token SIGNED "signed"
%put SIGNED summary "Numeric Type Modifier: signed <numeric type> <name> ..."
%token UNSIGNED "unsigned"
%put UNSIGNED summary "Numeric Type Modifier: unsigned <numeric type> <name> ..."

%token INLINE "inline"
%put INLINE summary "Function Modifier: inline <return  type> <name>(...) {...};"
%token VIRTUAL "virtual"
%put VIRTUAL summary "Method Modifier: virtual <type> <name>(...) ..."
%token MUTABLE "mutable"
%put MUTABLE summary "Member Declaration Modifier: mutable <type> <name> ..."
%token EXPLICIT "explicit"
%put EXPLICIT summary "Forbids implicit type conversion: explicit <constructor>"

%token STRUCT "struct"
%put STRUCT summary "Structure Type Declaration: struct [name] { ... };"
%token UNION "union"
%put UNION summary "Union Type Declaration: union [name] { ... };"
%token ENUM "enum"
%put ENUM summary "Enumeration Type Declaration: enum [name] { ... };"
%token TYPEDEF "typedef"
%put TYPEDEF summary "Arbitrary Type Declaration: typedef <typedeclaration> <name>;"
%token CLASS "class"
%put CLASS summary "Class Declaration: class <name>[:parents] { ... };"
%token TYPENAME "typename"
%put TYPENAME summary "typename is used to handle a qualified name as a typename;"
%token NAMESPACE "namespace"
%put NAMESPACE summary "Namespace Declaration: namespace <name> { ... };"
%token USING "using"
%put USING summary "using <namespace>;"

%token NEW "new"
%put NEW summary "new <classname>();"
%token DELETE "delete"
%put DELETE summary "delete <object>;"

;; Despite this, this parser can find templates by ignoring the TEMPLATE
;; keyword, and finding the class/method being templatized.
%token TEMPLATE "template"
%put TEMPLATE summary "template <class TYPE ...> TYPE_OR_FUNCTION"

%token THROW "throw"
%put THROW summary "<type> <methoddef> (<method args>) throw (<exception>) ..."
%token REENTRANT "reentrant"
%put REENTRANT summary "<type> <methoddef> (<method args>) reentrant ..."
%token TRY "try"
%token CATCH "catch"
%put { TRY CATCH } summary "try { <body> } catch { <catch code> }"

;; Leave these alone for now.
%token OPERATOR "operator"
%token PUBLIC "public"
%token PRIVATE "private"
%token PROTECTED "protected"
%token FRIEND "friend"
%put FRIEND summary "friend class <CLASSNAME>"

;; These aren't used for parsing, but is a useful place to describe the keywords.
%token IF "if"
%token ELSE "else"
%put {IF ELSE} summary  "if (<condition>) { code } [ else { code } ]"

%token DO "do"
%token WHILE "while"
%put DO summary " do { code } while (<condition>);"
%put WHILE summary "do { code } while (<condition>); or while (<condition>) { code };"

%token FOR "for"
%put FOR summary "for(<init>; <condition>; <increment>) { code }"

%token SWITCH "switch"
%token CASE "case"
%token DEFAULT "default"
%put {SWITCH CASE DEFAULT} summary
"switch (<variable>) { case <constvalue>: code; ... default: code; }"

%token RETURN "return"
%put RETURN summary "return <value>;"

%token BREAK "break"
%put BREAK summary "Non-local exit within a loop or switch (for, do/while, switch): break;"
%token CONTINUE "continue"
%put CONTINUE summary "Non-local continue within a loop (for, do/while): continue;"

%token SIZEOF "sizeof"
%put SIZEOF summary "Compile time macro: sizeof(<type or variable>) // size in bytes"

;; Types
%token VOID "void"
%put VOID summary "Built in type: void"
%token CHAR "char"
%put CHAR summary "Integral Character Type: (0 to 256)"
%token WCHAR "wchar_t"
%put WCHAR summary "Wide Character Type"
%token SHORT "short"
%put SHORT summary "Integral Primitive Type: (-32768 to 32767)"
%token INT "int"
%put INT summary "Integral Primitive Type: (-2147483648 to 2147483647)"
%token LONG "long"
%put LONG summary "Integral primitive type (-9223372036854775808 to 9223372036854775807)"
%token FLOAT "float"
%put FLOAT summary "Primitive floating-point type (single-precision 32-bit IEEE 754)"
%token DOUBLE "double"
%put DOUBLE summary "Primitive floating-point type (double-precision 64-bit IEEE 754)"
%token BOOL "bool"
%put BOOL summary "Primitive boolean type"

%token UNDERP "_P"
%token UNDERUNDERP "__P"
%put UNDERP summary "Common macro to eliminate prototype compatibility on some compilers"
%put UNDERUNDERP summary "Common macro to eliminate prototype compatibility on some compilers"

%%

declaration
  : macro
  | type
 ;; TODO: Klaus Berndl: Is the define here necessary or even wrong?
 ;; Is this part not already covered by macro??
  | define
  | var-or-fun
  | extern-c
  | template
  | using
  ;

codeblock
  : define
  | codeblock-var-or-fun
  | type ;; type is less likely to be used here.
  | using
  ;

extern-c-contents
  : open-paren
    ( nil )
  | declaration
  | close-paren
    ( nil )
  ;

extern-c
  : EXTERN C semantic-list
 ;; Extern C commands which contain a list need to have the
 ;; entries of the list extracted, and spliced into the main
 ;; list of entries.  This must be done via the function
 ;; that expands singular nonterminals, such as int x,y;
    (TAG "C" 'extern :members (EXPANDFULL $3 extern-c-contents) )
  | EXTERN CPP semantic-list
    (TAG "C" 'extern :members (EXPANDFULL $3 extern-c-contents) )
  | EXTERN C
 ;; A plain extern "C" call should add something to the token,
 ;; but just strip it from the buffer here for now.
    ( nil )
  | EXTERN CPP
    ( nil )
  ;

macro
  : spp-macro-def
    (VARIABLE-TAG $1 nil nil :constant-flag t )
  | spp-system-include
    (INCLUDE-TAG $1 t)
  | spp-include
    (INCLUDE-TAG $1 nil)
  ;

;; This is used in struct parts.
define
  : spp-macro-def
    (VARIABLE-TAG $1 nil nil :constant-flag t)
  | spp-macro-undef
    ( nil )
  ;

;; In C++, structures can have the same things as classes.
;; So delete this some day in the figure.
;;
;;structparts : semantic-list
;;            (EXPANDFULL $1 structsubparts)
;;          ;
;;
;;structsubparts : LBRACE
;;               ( nil )
;;             | RBRACE
;;               ( nil )
;;             | var-or-fun
;;             | define
;;             ;; sometimes there are defines in structs.
;;             ;

unionparts
  : semantic-list
    (EXPANDFULL $1 classsubparts)
  ;

opt-symbol
  : symbol
  | ;;EMPTY
  ;

;; @todo - support 'friend' construct.
classsubparts
  : LBRACE
    ( nil )
  | RBRACE
    ( nil )
  | class-protection opt-symbol COLON
 ;; For QT, they may put a `slot' keyword between the protection
 ;; and the COLON.  @todo - Have the QT stuff use macros.
    (TAG (car $1) 'label)
  | var-or-fun
  | FRIEND func-decl
    (TAG (car $2) 'friend)
  | FRIEND CLASS symbol
    (TAG $3 'friend)
  | type
  | define
  | template
  | ;;EMPTY
  ;

opt-class-parents
  : COLON class-parents opt-template-specifier
    ( $2 )
  | ;;EMPTY
    ( )
  ;

one-class-parent
  : opt-class-protection opt-class-declmods namespace-symbol
    (TYPE-TAG (car $3) "class" nil nil :protection (car $1))
  | opt-class-declmods opt-class-protection namespace-symbol
    (TYPE-TAG (car $3) "class" nil nil :protection (car $2))
  ;

class-parents
  : one-class-parent COMA class-parents
    ( ,(cons ,$1 $3 ) )
  | one-class-parent
    ( $1 )
  ;

opt-class-declmods
  : class-declmods opt-class-declmods
    ( nil )
  | ;;EMPTY
  ;

class-declmods
  : VIRTUAL
  ;

class-protection
  : PUBLIC
  | PRIVATE
  | PROTECTED
  ;

opt-class-protection
  : class-protection
    ( ,$1 )
  | ;;EMPTY - Same as private
    ( "unspecified" )
  ;

namespaceparts
  : semantic-list
    (EXPANDFULL $1 namespacesubparts)
  ;

namespacesubparts
  : LBRACE
    ( nil )
  | RBRACE
    ( nil )
  | type
  | var-or-fun
  | define
  | class-protection COLON
    (TAG (car $1) 'label)
 ;; In C++, this label in a classsubpart represents
 ;; PUBLIC or PRIVATE bits.  Ignore them for now.
  | template
  | using
 ;; Includes inside namespaces
  | spp-include
    (TAG $1 'include :inside-ns t)
  | ;;EMPTY
  ;

enumparts
  : semantic-list
    (EXPANDFULL $1 enumsubparts)
  ;

enumsubparts
  : symbol opt-assign
    (VARIABLE-TAG $1 "int" (car $2) :constant-flag t )
  | LBRACE
    ( nil )
  | RBRACE
    ( nil )
  | COMA
    ( nil )
  ;

opt-name
  : symbol
  | ;;EMPTY
    ( "" )
  ;

typesimple
  : struct-or-class opt-class opt-name opt-template-specifier
    opt-class-parents semantic-list
    (TYPE-TAG (car $3) (car $1)
          (let ((semantic-c-classname (cons (car ,$3) (car ,$1))))
            (EXPANDFULL $6 classsubparts))
          $5
          :template-specifier $4
          :parent (car ,$2))
  | struct-or-class opt-class opt-name opt-template-specifier
    opt-class-parents
    (TYPE-TAG (car $3) (car $1) nil $5
              :template-specifier $4
	      :prototype t
              :parent (car ,$2))
  | UNION opt-class opt-name unionparts
    (TYPE-TAG (car $3) $1 $4 nil
              :parent (car ,$2))
  | ENUM opt-class opt-name enumparts
    (TYPE-TAG (car $3) $1 $4 nil
              :parent (car ,$2))
 ;; Klaus Berndl: a typedef can be a typeformbase with all this
 ;; declmods stuff.
  | TYPEDEF declmods typeformbase cv-declmods typedef-symbol-list
 ;;;; We put the type this typedef renames into PARENT
 ;;;; but will move it in the expand function.
    (TYPE-TAG $5 $1 nil (list $3) )
  ;

typedef-symbol-list
  : typedefname COMA typedef-symbol-list
    ( ,(cons $1 $3) )
  | typedefname
    ( $1 )
  ;

;; TODO: Klaus Berndl: symbol -> namespace-symbol?!  Answer: Probably
;; symbol is correct here!
typedefname
  : opt-stars symbol opt-bits opt-array
    ( $1 $2 )
  ;

struct-or-class
  : STRUCT
  | CLASS
  ;

type
  : typesimple SEMICOLON
    ( ,$1 )
 ;; named namespaces like "namespace XXX {"
  | NAMESPACE symbol namespaceparts
    (TYPE-TAG $2 $1 $3 nil )
 ;; unnamed namespaces like "namespace {"
  | NAMESPACE namespaceparts
    (TYPE-TAG "unnamed" $1 $2 nil )
 ;; David Engster: namespace alias like "namespace foo = bar;"
  | NAMESPACE symbol EQUAL typeformbase SEMICOLON
    (TYPE-TAG $2 $1 (list (TYPE-TAG (car $4) $1 nil nil)) nil :kind 'alias )
  ;

;; Klaus Berndl: We must parse "using namespace XXX" too

;; Using is vaguely like an include statement in the named portions
;; of the code.  We should probably specify a new token type for this.

using
  : USING usingname SEMICOLON
    (TAG (car $2) 'using :type ,$2 )
  ;

;; Jan Moringen: Differentiate between 'using' and 'using namespace'
;; Adapted to creating type tags by EML.
usingname
  : typeformbase
    (TYPE-TAG (car $1) "class" nil nil :prototype t)
  | NAMESPACE typeformbase
    (TYPE-TAG (car $2) "namespace" nil nil :prototype t)
  ;

template
  : TEMPLATE template-specifier opt-friend template-definition
    ( ,(semantic-c-reconstitute-template $4 ,$2) )
  ;

opt-friend
  : FRIEND
  | ;;EMPTY
  ;

opt-template-specifier
  : template-specifier
    ( ,$1 )
  | ;;EMPTY
    ( )
  ;

template-specifier
  : LESS template-specifier-types GREATER
    ( ,$2 )
  ;

template-specifier-types
  : template-var template-specifier-type-list
    ( ,(cons ,$1 ,$2 ) )
  | ;;EMPTY
  ;

template-specifier-type-list
  : COMA template-specifier-types
    ( ,$2 )
  | ;;EMPTY
    ( )
  ;

;; template-var
;;   : template-type opt-stars opt-template-equal
;;     ( ,(cons (concat (car $1) (make-string (car ,$2) ?*))
;;              (cdr $1)))
;;  ;; Klaus Berndl: for template-types the template-var can also be
;;  ;; literals or constants.  Example: map<ClassX, ClassY, 10>
;;  ;; map_size10_var; This parses also template<class T, 0> which is
;;  ;; nonsense but who cares....
;;   | string
;;     ( $1 )
;;   | number
;;     ( $1 )
;;   ;

template-var
  :
 ;; Klaus Berndl: The following handles all template-vars of
 ;; template-definitions
    template-type opt-template-equal
    ( ,(cons (car $1) (cdr $1)) )
 ;; Klaus Berndl: for template-types the template-var can also be
 ;; literals or constants.
 ;; Example: map<ClassX, ClassY, 10> map_size10_var; This parses also
 ;; template<class T, 0> which is nonsense but who cares....
  | string
    ( $1 )
  | number
    ( $1 )
 ;; Klaus Berndl: In template-types arguments can be any symbols with
 ;; optional address-operator (&) and optional dereferencing operator
 ;; (*).  Example map<ClassX, ClassY, *size_var_ptr> sized_map_var.
  | opt-stars opt-ref namespace-symbol
    ( ,$3 )
 ;; Some code can compile down into a number, but starts out as an
 ;; expression, such as "sizeof(a)", or (sizeof(a)/sizeof(b))
  | semantic-list
    ( $1 )
  | SIZEOF semantic-list
    ( $2 )
  ;

opt-template-equal
  : EQUAL symbol LESS template-specifier-types GREATER
    ( $2 )
  | EQUAL symbol
    ( $2 )
  | ;;EMPTY
    ( )
  ;

template-type
  : CLASS symbol
    (TYPE-TAG $2 "class" nil nil )
  | STRUCT symbol
    (TYPE-TAG $2 "struct" nil nil )
 ;; TODO: Klaus Berndl: For the moment it is ok, that we parse the C++
 ;; keyword typename as a class....
  | TYPENAME symbol
    (TYPE-TAG $2 "class" nil nil)
 ;; Klaus Berndl: template-types can be all flavors of variable-args
 ;; but here the argument is ignored, only the type stuff is needed.
  | declmods typeformbase cv-declmods opt-stars
    opt-ref variablearg-opt-name
    (TYPE-TAG (car $2) nil nil nil
	      :template-specifier (plist-get (nth 2 $2) :template-specifier)
              :constant-flag (if (member "const" (append $1 $3)) t nil)
              :typemodifiers (delete "const" (append $1 $3))
              :reference (car ,$5)
              :pointer (car $4)
	      :typevar (car $6)
              )
  ;

template-definition
  : type
    ( ,$1 )
  | var-or-fun
    ( ,$1 )
  ;

opt-stars
  : STAR opt-starmod opt-stars
    ( (1+ (car $3)) )
  | ;;EMPTY
    ( 0 )
  ;

opt-starmod
  : STARMOD opt-starmod
    ( ,(cons (,car ,$1) $2) )
  | ;;EMPTY
    ()
  ;

STARMOD
  : CONST
  ;

declmods
  : DECLMOD declmods
    ( ,(cons ,(car ,$1) $2 ) )
  | DECLMOD
    ( ,$1 )
  | ;;EMPTY
    ()
  ;

DECLMOD
  : EXTERN
  | STATIC
  | CVDECLMOD
 ;; Klaus Berndl: IMHO signed and unsigned are not decl-modes but
 ;; these are only valid for some buildin-types like short, int
 ;; etc... whereas "real" declmods are valid for all types, buildin
 ;; and user-defined!  SIGNED UNSIGNED
  | INLINE
  | REGISTER
  | FRIEND
 ;; Klaus Berndl: There can be a few cases where TYPENAME is not
 ;; allowed in C++-syntax but better than not recognizing the allowed
 ;; situations.
  | TYPENAME
  | METADECLMOD
 ;; This is a hack in case we are in a class.
  | VIRTUAL
  ;

metadeclmod
  : METADECLMOD
    ()
  | ;;EMPTY
    ()
  ;

CVDECLMOD
  : CONST
  | VOLATILE
  ;

cv-declmods
  : CVDECLMOD cv-declmods
    ( ,(cons ,(car ,$1) $2 ) )
  | CVDECLMOD
    ( ,$1 )
  | ;;EMPTY
    ()
  ;

METADECLMOD
  : VIRTUAL
  | MUTABLE
  ;

;; C++: A type can be modified into a reference by "&"
opt-ref
  : AMPERSAND
    ( 1 )
  | ;;EMPTY
    ( 0 )
  ;

typeformbase
  : typesimple
    ( ,$1 )
  | STRUCT symbol
    (TYPE-TAG $2 $1 nil nil )
  | UNION symbol
    (TYPE-TAG $2 $1 nil nil )
  | ENUM symbol
    (TYPE-TAG $2 $1 nil nil )
  | builtintype
    ( ,$1 )
  | symbol template-specifier
    (TYPE-TAG $1 "class" nil nil :template-specifier $2)
 ;;| namespace-symbol opt-stars opt-template-specifier
 ;;| namespace-symbol opt-template-specifier
  | namespace-symbol-for-typeformbase opt-template-specifier
    (TYPE-TAG (car $1) "class" nil nil
	      :template-specifier $2)
  | symbol
    ( $1 )
  ;

signedmod
  : UNSIGNED
  | SIGNED
  ;

;; Klaus Berndl: builtintype-types was builtintype
builtintype-types
  : VOID
  | CHAR
 ;; Klaus Berndl: Added WCHAR
  | WCHAR
  | SHORT INT
    ( (concat $1 " " $2) )
  | SHORT
  | INT
  | LONG INT
    ( (concat $1 " " $2) )
  | FLOAT
  | DOUBLE
  | BOOL
  | LONG DOUBLE
    ( (concat $1 " " $2) )
 ;; TODO: Klaus Berndl: Is there a long long, i think so?!
  | LONG LONG
    ( (concat $1 " " $2) )
  | LONG
  ;

builtintype
  : signedmod builtintype-types
    ( (concat (car $1) " " (car $2)) )
  | builtintype-types
    ( ,$1 )
 ;; Klaus Berndl: unsigned is synonym for unsigned int and signed for
 ;; signed int. To make this confusing stuff clear we add here the
 ;; int.
  | signedmod
    ( (concat (car $1) " int") )
  ;

;; Klaus Berndl: This parses also nonsense like "const volatile int
;; const volatile const const volatile a ..." but IMHO nobody writes
;; such code. Normally we should define a rule like typeformbase-mode
;; which exactly defines the different allowed cases and combinations
;; of declmods (minus the CVDECLMOD) typeformbase and cv-declmods so
;; we could recognize more invalid code but IMHO this is not worth the
;; effort...
codeblock-var-or-fun
  : declmods typeformbase declmods
    opt-ref var-or-func-decl
    ( ,(semantic-c-reconstitute-token ,$5 $1 $2 ) )
  ;

var-or-fun
  : codeblock-var-or-fun
    ( ,$1 )
 ;; it is possible for a function to not have a type, and
 ;; it is then assumed to be an int.  How annoying.
 ;; In C++, this could be a constructor or a destructor.
 ;; Even more annoying.  Only ever do this for regular
 ;; top-level items.  Ignore this problem in code blocks
 ;; so that we don't have to deal with regular code
 ;; being erroneously converted into types.
  | declmods var-or-func-decl
    ( ,(semantic-c-reconstitute-token ,$2 $1 nil ) )
  ;

var-or-func-decl
  : func-decl
    ( ,$1 )
  | var-decl
    ( ,$1 )
  ;

func-decl
  : opt-stars opt-class opt-destructor functionname
    opt-template-specifier
    opt-under-p
    arg-list
    opt-post-fcn-modifiers
    opt-throw
    opt-initializers
    fun-or-proto-end
    ( ,$4 'function
          ;; Extra stuff goes in here.
          ;; Continue with the stuff we found in
          ;; this definition
          $2 $3 $7 $9 $8 ,$1 ,$11 $5 ,$10)
  | opt-stars opt-class opt-destructor functionname
    opt-template-specifier
    opt-under-p
 ;; arg-list   - - ini this case, a try implies a fcn.
    opt-post-fcn-modifiers
    opt-throw
    opt-initializers
    fun-try-end
    ( ,$4 'function
          ;; Extra stuff goes in here.
          ;; Continue with the stuff we found in
          ;; this definition
          $2 $3 nil $8 $7 ,$1 ,$10 $5 ,$9)
  ;

var-decl
  : varnamelist SEMICOLON
    ( $1 'variable )
  ;

opt-under-p
  : UNDERP
    ( nil )
  | UNDERUNDERP
    ( nil )
  | ;;EMPTY
  ;

;; Klaus Berndl: symbol -> namespace-symbol
opt-initializers
  : COLON namespace-symbol semantic-list opt-initializers
  | COMA namespace-symbol semantic-list opt-initializers
  | ;;EMPTY
  ;

opt-post-fcn-modifiers
  : post-fcn-modifiers opt-post-fcn-modifiers
    ( ,(cons ,(car $1) $2) )
  | ;;EMPTY
    ( nil )
  ;

post-fcn-modifiers
  : REENTRANT
  | CONST
  ;

opt-throw
  : THROW semantic-list
    ( EXPAND $2 throw-exception-list )
  | ;;EMPTY
  ;

;; Is this true?  I don't actually know.
throw-exception-list
  : namespace-symbol COMA throw-exception-list
    ( ,(cons (car $1) $3) )
  | namespace-symbol RPAREN
    ( ,$1 )
  | symbol RPAREN
    ( $1 )
  | LPAREN throw-exception-list
    ( ,$2 )
  | RPAREN
    (  )
  ;

opt-bits
  : COLON number
    ( $2 )
  | ;;EMPTY
    ( nil )
  ;

opt-array
  : BRACK_BLCK opt-array
 ;; Eventually we want to replace the 1 below with a size
 ;; (if available)
    ( (cons 1 (car ,$2) ) )
  | ;;EMPTY
    ( nil )
  ;

opt-assign
  : EQUAL expression
    ( $2 )
  | ;;EMPTY
    ( nil )
  ;

opt-restrict
  : RESTRICT
  | ;;EMPTY
  ;

;; Klaus Berndl: symbol -> namespace-symbol?! I think so. Can be that
;; then also some invalid C++-syntax is parsed but this is better than
;; not parsing valid syntax.
varname
  : opt-stars opt-restrict namespace-symbol opt-bits opt-array
    ( ,$3 ,$1 ,$4 ,$5 )
  ;

;; I should store more in this def, but leave it simple for now.
;; Klaus Berndl: const and volatile can be written after the type!
variablearg
  : declmods typeformbase cv-declmods opt-ref variablearg-opt-name opt-assign
    ( VARIABLE-TAG (list (append $5 ,$6)) $2 nil
                   :constant-flag (if (member "const" (append $1 $3)) t nil)
                   :typemodifiers (delete "const" (append $1 $3))
                   :reference (car ,$4)
                   )
  ;

variablearg-opt-name
  : varname
    ( ,$1 )
  | semantic-list arg-list
    ( (car ( EXPAND $1 function-pointer )) $2)
 ;; Klaus Berndl: This allows variableargs without an arg-name being
 ;; parsed correctly even if there several pointers (*)
  | opt-stars
    ( "" ,$1 nil nil nil )
  ;

varname-opt-initializer
  : semantic-list
  | opt-assign
  | ;; EMPTY
  ;

varnamelist
  : opt-ref varname varname-opt-initializer COMA varnamelist
    ( ,(cons (append $2 $3) $5) )
  | opt-ref varname varname-opt-initializer
    ( (append $2 $3) )
  ;

;; Klaus Berndl: Is necessary to parse stuff like
;;     class list_of_facts : public list<fact>, public entity
;; and
;;     list <shared_ptr<item> >::const_iterator l;
;; Parses also invalid(?) and senseless(?) c++-syntax like
;;     symbol<template-spec>::symbol1<template-spec1>::test_iterator
;; but better parsing too much than to less
namespace-symbol
  : symbol opt-template-specifier COLON COLON namespace-symbol
    ( (concat $1 "::" (car $5)) )
  | symbol opt-template-specifier
    ( $1 )
  ;

;; Don't pull an optional template specifier at the end of the
;; namespace symbol so that it can be picked up by the type.
namespace-symbol-for-typeformbase
  : symbol opt-template-specifier COLON COLON namespace-symbol-for-typeformbase
    ( (concat $1 "::" (car $5)) )
  | symbol
    ( $1 )
  ;
;; namespace-symbol
;;   : symbol COLON COLON namespace-symbol
;;     ( (concat $1 "::" (car $4)) )
;;   | symbol
;;     ( $1 )
;;   ;

namespace-opt-class
  : symbol COLON COLON namespace-opt-class
    ( (concat $1 "::" (car $4)) )
 ;; Klaus Berndl: We must recognize template-specifiers here so we can
 ;; parse correctly the method-implementations of template-classes
 ;; outside the template-class-declaration Example:
 ;; TemplateClass1<T>::method_1(...)
  | symbol opt-template-specifier COLON COLON
    ( $1 )
  ;

;; Klaus Berndl: The opt-class of a func-decl must be able to
;; recognize opt-classes with namespaces, e.g.
;; Test1::Test2::classname::
opt-class
  : namespace-opt-class
    ( ,$1 )
  | ;;EMPTY
    ( nil )
  ;

opt-destructor
  : TILDE
    ( t )
  | ;;EMPTY
    ( nil )
  ;

arg-list
  : PAREN_BLCK knr-arguments
    ( ,$2 )
  | PAREN_BLCK
    (EXPANDFULL $1 arg-sub-list)
  | VOID_BLCK
    ( )
  ;

knr-varnamelist
  : varname COMA knr-varnamelist
    ( ,(cons $1 $3) )
  | varname
    ( $1 )
  ;


knr-one-variable-decl
  : declmods typeformbase cv-declmods knr-varnamelist
    ( VARIABLE-TAG (nreverse $4) $2 nil
                   :constant-flag (if (member "const" (append $3)) t nil)
                   :typemodifiers (delete "const" $3)
                   )
  ;

knr-arguments
  : knr-one-variable-decl SEMICOLON knr-arguments
    ( ,(append (semantic-expand-c-tag ,$1) ,$3) )
  | knr-one-variable-decl SEMICOLON
    ( ,(semantic-expand-c-tag ,$1) )
  ;

arg-sub-list
  : variablearg
    ( ,$1 )
  | PERIOD PERIOD PERIOD RPAREN
    (VARIABLE-TAG "..." "vararg" nil)
  | COMA
    ( nil )
  | LPAREN
    ( nil )
  | RPAREN
    ( nil )
  ;

operatorsym
  : LESS LESS EQUAL
    ( "<<=" )
  | GREATER GREATER EQUAL
    ( ">>=" )
  | LESS LESS
    ( "<<" )
  | GREATER GREATER
    ( ">>" )
  | EQUAL EQUAL
    ( "==" )
  | LESS EQUAL
    ( "<=" )
  | GREATER EQUAL
    ( ">=" )
  | BANG EQUAL
    ( "!=" )
  | PLUS EQUAL
    ( "+=" )
  | MINUS EQUAL
    ( "-=" )
  | STAR EQUAL
    ( "*=" )
  | DIVIDE EQUAL
    ( "/=" )
  | MOD EQUAL
    ( "%=" )
  | AMPERSAND EQUAL
    ( "&=" )
  | OR EQUAL
    ( "|=" )
  | MINUS GREATER STAR
    ( "->*" )
  | MINUS GREATER
    ( "->" )
  | PARENS
    ( "()" )
  | BRACKETS
    ( "[]" )
  | LESS
  | GREATER
  | STAR
  | PLUS PLUS
    ( "++" )
  | PLUS
  | MINUS MINUS
    ( "--" )
  | MINUS
  | AMPERSAND AMPERSAND
    ( "&&" )
  | AMPERSAND
  | OR OR
    ( "||" )
  | OR
  | DIVIDE
  | EQUAL
  | BANG
  | TILDE
  | MOD
  | COMA
 ;; HAT EQUAL seems to have a really unpleasant result and
 ;; breaks everything after it.  Leave it at the end, though it
 ;; doesn't seem to work.
  | HAT EQUAL
    ( "^=" )
  | HAT
  ;

functionname
  : OPERATOR operatorsym
    ( ,$2 )
  | semantic-list
    ( EXPAND $1 function-pointer )
  | symbol
    ( $1 )
  ;

function-pointer
  : LPAREN STAR opt-symbol RPAREN
    ( (concat "*" ,(car $3)) )
  | LPAREN symbol RPAREN
    ( $2 )
  ;

fun-or-proto-end
  : SEMICOLON
    ( t )
  | semantic-list
    ( nil )
 ;; Here is an annoying feature of C++ pure virtual methods
  | EQUAL ZERO SEMICOLON
    ( :pure-virtual-flag )
  | fun-try-end
    ( nil )
  ;

fun-try-end
  : TRY opt-initializers BRACE_BLCK fun-try-several-catches
    ( nil )
  ;

fun-try-several-catches
  : CATCH PAREN_BLCK BRACE_BLCK fun-try-several-catches
    ( )
  | CATCH BRACE_BLCK fun-try-several-catches
    ( )
  | ;; EMPTY
    ( )
  ;

type-cast
  : semantic-list
    ( EXPAND $1 type-cast-list )
  ;

type-cast-list
  : open-paren typeformbase close-paren
  ;

opt-brackets-after-symbol
  : brackets-after-symbol
  | ;; EMPTY
  ;

brackets-after-symbol
  : PAREN_BLCK
  | BRACK_BLCK
  ;

multi-stage-dereference
  : namespace-symbol opt-brackets-after-symbol
    PERIOD multi-stage-dereference ;; method call
  | namespace-symbol opt-brackets-after-symbol
    MINUS GREATER multi-stage-dereference ;;method call
  | namespace-symbol opt-brackets-after-symbol
    PERIOD namespace-symbol opt-brackets-after-symbol
  | namespace-symbol opt-brackets-after-symbol
    MINUS GREATER namespace-symbol opt-brackets-after-symbol
  | namespace-symbol brackets-after-symbol
  ;

string-seq
  : string string-seq
    ( (concat $1 (car $2)) )
  | string
    ( $1 )
  ;

expr-start
  : MINUS
  | PLUS
  | STAR
  | AMPERSAND
  ;

expr-binop
  : MINUS
  | PLUS
  | STAR
  | DIVIDE
  | AMPERSAND AMPERSAND
  | AMPERSAND
  | OR OR
  | OR
  | MOD
 ;; There are more.
  ;

;; Use expression for parsing only.  Don't actually return anything
;; for now.  Hopefully we can fix this later.
expression
  : unaryexpression QUESTION unaryexpression COLON unaryexpression
    ( (identity start) (identity end) )
  | unaryexpression expr-binop unaryexpression
    ( (identity start) (identity end) )
  | unaryexpression
    ( (identity start) (identity end) )
  ;

unaryexpression
  : number
  | multi-stage-dereference
  | NEW multi-stage-dereference
  | NEW builtintype-types semantic-list
  | symbol
 ;; Klaus Berndl: C/C++ allows sequences of strings which are
 ;; concatenated by the precompiler to one string
  | string-seq
  | type-cast expression  ;; A cast to some other type
 ;; Casting the results of one expression to something else.
  | semantic-list expression
  | semantic-list
  | expr-start expression
  ;

;;; c.by ends here