-*- Autoconf -*-
# C++ skeleton for Bison
# Copyright (C) 2002-2015 Free Software Foundation, Inc.
# This program 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.
#
# 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
# Sanity checks, before defaults installed by c.m4.
b4_percent_define_ifdef([[api.value.union.name]],
[b4_complain_at(b4_percent_define_get_loc([[api.value.union.name]]),
[named %union is invalid in C++])])
m4_include(b4_pkgdatadir/[c.m4])
# b4_comment(TEXT, [PREFIX])
# --------------------------
# Put TEXT in comment. Prefix all the output lines with PREFIX.
m4_define([b4_comment],
[b4_comment_([$1], [$2// ], [$2// ])])
## -------- ##
## Checks. ##
## -------- ##
b4_percent_define_check_kind([api.namespace], [code], [deprecated])
b4_percent_define_check_kind([parser_class_name], [code], [deprecated])
## ---------------- ##
## Default values. ##
## ---------------- ##
b4_percent_define_default([[parser_class_name]], [[parser]])
# Don't do that so that we remember whether we're using a user
# request, or the default value.
#
# b4_percent_define_default([[api.location.type]], [[location]])
b4_percent_define_default([[filename_type]], [[std::string]])
# Make it a warning for those who used betas of Bison 3.0.
b4_percent_define_default([[api.namespace]], m4_defn([b4_prefix]))
b4_percent_define_default([[global_tokens_and_yystype]], [[false]])
b4_percent_define_default([[define_location_comparison]],
[m4_if(b4_percent_define_get([[filename_type]]),
[std::string], [[true]], [[false]])])
## ----------- ##
## Namespace. ##
## ----------- ##
m4_define([b4_namespace_ref], [b4_percent_define_get([[api.namespace]])])
# Don't permit an empty b4_namespace_ref. Any '::parser::foo' appended to it
# would compile as an absolute reference with 'parser' in the global namespace.
# b4_namespace_open would open an anonymous namespace and thus establish
# internal linkage. This would compile. However, it's cryptic, and internal
# linkage for the parser would be specified in all translation units that
# include the header, which is always generated. If we ever need to permit
# internal linkage somehow, surely we can find a cleaner approach.
m4_if(m4_bregexp(b4_namespace_ref, [^[ ]*$]), [-1], [],
[b4_complain_at(b4_percent_define_get_loc([[api.namespace]]),
[[namespace reference is empty]])])
# Instead of assuming the C++ compiler will do it, Bison should reject any
# invalid b4_namepsace_ref that would be converted to a valid
# b4_namespace_open. The problem is that Bison doesn't always output
# b4_namespace_ref to uncommented code but should reserve the ability to do so
# in future releases without risking breaking any existing user grammars.
# Specifically, don't allow empty names as b4_namespace_open would just convert
# those into anonymous namespaces, and that might tempt some users.
m4_if(m4_bregexp(b4_namespace_ref, [::[ ]*::]), [-1], [],
[b4_complain_at(b4_percent_define_get_loc([[api.namespace]]),
[[namespace reference has consecutive "::"]])])
m4_if(m4_bregexp(b4_namespace_ref, [::[ ]*$]), [-1], [],
[b4_complain_at(b4_percent_define_get_loc([[api.namespace]]),
[[namespace reference has a trailing "::"]])])
m4_define([b4_namespace_open],
[b4_user_code([b4_percent_define_get_syncline([[api.namespace]])
[namespace ]m4_bpatsubst(m4_dquote(m4_bpatsubst(m4_dquote(b4_namespace_ref),
[^\(.\)[ ]*::], [\1])),
[::], [ { namespace ])[ {]])])
m4_define([b4_namespace_close],
[b4_user_code([b4_percent_define_get_syncline([[api.namespace]])
m4_bpatsubst(m4_dquote(m4_bpatsubst(m4_dquote(b4_namespace_ref[ ]),
[^\(.\)[ ]*\(::\)?\([^][:]\|:[^:]\)*],
[\1])),
[::\([^][:]\|:[^:]\)*], [} ])[} // ]b4_namespace_ref])])
# b4_token_enums
# --------------
# Output the definition of the tokens as enums.
m4_define([b4_token_enums],
[[enum yytokentype
{
]m4_join([,
],
b4_symbol_map([b4_token_enum]))[
};]dnl
])
## ----------------- ##
## Semantic Values. ##
## ----------------- ##
# b4_value_type_declare
# ---------------------
# Declare semantic_type.
m4_define([b4_value_type_declare],
[b4_value_type_setup[]dnl
[ /// Symbol semantic values.
]m4_bmatch(b4_percent_define_get_kind([[api.value.type]]),
[code],
[[ typedef ]b4_percent_define_get([[api.value.type]])[ semantic_type;]],
[m4_bmatch(b4_percent_define_get([[api.value.type]]),
[union\|union-directive],
[[ union semantic_type
{
]b4_user_union_members[
};]])])dnl
])
# b4_public_types_declare
# -----------------------
# Define the public types: token, semantic value, location, and so forth.
# Depending on %define token_lex, may be output in the header or source file.
m4_define([b4_public_types_declare],
[[#ifndef ]b4_api_PREFIX[STYPE
]b4_value_type_declare[
#else
typedef ]b4_api_PREFIX[STYPE semantic_type;
#endif]b4_locations_if([
/// Symbol locations.
typedef b4_percent_define_get([[api.location.type]],
[[location]]) location_type;])[
/// Syntax errors thrown from user actions.
struct syntax_error : std::runtime_error
{
syntax_error (]b4_locations_if([const location_type& l, ])[const std::string& m);]b4_locations_if([
location_type location;])[
};
/// Tokens.
struct token
{
]b4_token_enums[
};
/// (External) token type, as returned by yylex.
typedef token::yytokentype token_type;
/// Symbol type: an internal symbol number.
typedef int symbol_number_type;
/// The symbol type number to denote an empty symbol.
enum { empty_symbol = -2 };
/// Internal symbol number for tokens (subsumed by symbol_number_type).
typedef ]b4_int_type_for([b4_translate])[ token_number_type;
/// A complete symbol.
///
/// Expects its Base type to provide access to the symbol type
/// via type_get().
///
/// Provide access to semantic value]b4_locations_if([ and location])[.
template <typename Base>
struct basic_symbol : Base
{
/// Alias to Base.
typedef Base super_type;
/// Default constructor.
basic_symbol ();
/// Copy constructor.
basic_symbol (const basic_symbol& other);
]b4_variant_if([[
/// Constructor for valueless symbols, and symbols from each type.
]b4_type_foreach([b4_basic_symbol_constructor_declare])], [[
/// Constructor for valueless symbols.
basic_symbol (typename Base::kind_type t]b4_locations_if([,
const location_type& l])[);]])[
/// Constructor for symbols with semantic value.
basic_symbol (typename Base::kind_type t,
const semantic_type& v]b4_locations_if([,
const location_type& l])[);
/// Destroy the symbol.
~basic_symbol ();
/// Destroy contents, and record that is empty.
void clear ();
/// Whether empty.
bool empty () const;
/// Destructive move, \a s is emptied into this.
void move (basic_symbol& s);
/// The semantic value.
semantic_type value;]b4_locations_if([
/// The location.
location_type location;])[
private:
/// Assignment operator.
basic_symbol& operator= (const basic_symbol& other);
};
/// Type access provider for token (enum) based symbols.
struct by_type
{
/// Default constructor.
by_type ();
/// Copy constructor.
by_type (const by_type& other);
/// The symbol type as needed by the constructor.
typedef token_type kind_type;
/// Constructor from (external) token numbers.
by_type (kind_type t);
/// Record that this symbol is empty.
void clear ();
/// Steal the symbol type from \a that.
void move (by_type& that);
/// The (internal) type number (corresponding to \a type).
/// \a empty when empty.
symbol_number_type type_get () const;
/// The token.
token_type token () const;
/// The symbol type.
/// \a empty_symbol when empty.
/// An int, not token_number_type, to be able to store empty_symbol.
int type;
};
/// "External" symbols: returned by the scanner.
typedef basic_symbol<by_type> symbol_type;
]b4_symbol_constructor_declare])
# b4_public_types_define
# ----------------------
# Provide the implementation needed by the public types.
m4_define([b4_public_types_define],
[[ inline
]b4_parser_class_name[::syntax_error::syntax_error (]b4_locations_if([const location_type& l, ])[const std::string& m)
: std::runtime_error (m)]b4_locations_if([
, location (l)])[
{}
// basic_symbol.
template <typename Base>
inline
]b4_parser_class_name[::basic_symbol<Base>::basic_symbol ()
: value ()
{}
template <typename Base>
inline
]b4_parser_class_name[::basic_symbol<Base>::basic_symbol (const basic_symbol& other)
: Base (other)
, value ()]b4_locations_if([
, location (other.location)])[
{
]b4_variant_if([b4_symbol_variant([other.type_get ()], [value], [copy],
[other.value])],
[value = other.value;])[
}
template <typename Base>
inline
]b4_parser_class_name[::basic_symbol<Base>::basic_symbol (]b4_join(
[typename Base::kind_type t],
[const semantic_type& v],
b4_locations_if([const location_type& l]))[)
: Base (t)
, value (]b4_variant_if([], [v])[)]b4_locations_if([
, location (l)])[
{]b4_variant_if([[
(void) v;
]b4_symbol_variant([this->type_get ()], [value], [copy], [v])])[}
]b4_variant_if([[
// Implementation of basic_symbol constructor for each type.
]b4_type_foreach([b4_basic_symbol_constructor_define])], [[
/// Constructor for valueless symbols.
template <typename Base>
inline
]b4_parser_class_name[::basic_symbol<Base>::basic_symbol (]b4_join(
[typename Base::kind_type t],
b4_locations_if([const location_type& l]))[)
: Base (t)
, value ()]b4_locations_if([
, location (l)])[
{}]])[
template <typename Base>
inline
]b4_parser_class_name[::basic_symbol<Base>::~basic_symbol ()
{
clear ();
}
template <typename Base>
inline
void
]b4_parser_class_name[::basic_symbol<Base>::clear ()
{]b4_variant_if([[
// User destructor.
symbol_number_type yytype = this->type_get ();
basic_symbol<Base>& yysym = *this;
(void) yysym;
switch (yytype)
{
]b4_symbol_foreach([b4_symbol_destructor])dnl
[ default:
break;
}
// Type destructor.
]b4_symbol_variant([[yytype]], [[value]], [[template destroy]])])[
Base::clear ();
}
template <typename Base>
inline
bool
]b4_parser_class_name[::basic_symbol<Base>::empty () const
{
return Base::type_get () == empty_symbol;
}
template <typename Base>
inline
void
]b4_parser_class_name[::basic_symbol<Base>::move (basic_symbol& s)
{
super_type::move(s);
]b4_variant_if([b4_symbol_variant([this->type_get ()], [value], [move],
[s.value])],
[value = s.value;])[]b4_locations_if([
location = s.location;])[
}
// by_type.
inline
]b4_parser_class_name[::by_type::by_type ()
: type (empty_symbol)
{}
inline
]b4_parser_class_name[::by_type::by_type (const by_type& other)
: type (other.type)
{}
inline
]b4_parser_class_name[::by_type::by_type (token_type t)
: type (yytranslate_ (t))
{}
inline
void
]b4_parser_class_name[::by_type::clear ()
{
type = empty_symbol;
}
inline
void
]b4_parser_class_name[::by_type::move (by_type& that)
{
type = that.type;
that.clear ();
}
inline
int
]b4_parser_class_name[::by_type::type_get () const
{
return type;
}
]b4_token_ctor_if([[
inline
]b4_parser_class_name[::token_type
]b4_parser_class_name[::by_type::token () const
{
// YYTOKNUM[NUM] -- (External) token number corresponding to the
// (internal) symbol number NUM (which must be that of a token). */
static
const ]b4_int_type_for([b4_toknum])[
yytoken_number_[] =
{
]b4_toknum[
};
return static_cast<token_type> (yytoken_number_[type]);
}
]])[]dnl
b4_symbol_constructor_define])
# b4_symbol_constructor_declare
# b4_symbol_constructor_define
# -----------------------------
# Declare/define symbol constructors for all the value types.
# Use at class-level. Redefined in variant.hh.
m4_define([b4_symbol_constructor_declare], [])
m4_define([b4_symbol_constructor_define], [])
# b4_yytranslate_define
# ---------------------
# Define yytranslate_. Sometimes used in the header file,
# sometimes in the cc file.
m4_define([b4_yytranslate_define],
[[ // Symbol number corresponding to token number t.
inline
]b4_parser_class_name[::token_number_type
]b4_parser_class_name[::yytranslate_ (]b4_token_ctor_if([token_type],
[int])[ t)
{
static
const token_number_type
translate_table[] =
{
]b4_translate[
};
const unsigned int user_token_number_max_ = ]b4_user_token_number_max[;
const token_number_type undef_token_ = ]b4_undef_token_number[;
if (static_cast<int>(t) <= yyeof_)
return yyeof_;
else if (static_cast<unsigned int> (t) <= user_token_number_max_)
return translate_table[t];
else
return undef_token_;
}
]])
# b4_lhs_value([TYPE])
# --------------------
# Expansion of $<TYPE>$.
m4_define([b4_lhs_value],
[b4_symbol_value([yyval], [$1])])
# b4_rhs_value(RULE-LENGTH, NUM, [TYPE])
# --------------------------------------
# Expansion of $<TYPE>NUM, where the current rule has RULE-LENGTH
# symbols on RHS.
m4_define([b4_rhs_value],
[b4_symbol_value([yysemantic_stack_@{($1) - ($2)@}], [$3])])
# b4_lhs_location()
# -----------------
# Expansion of @$.
m4_define([b4_lhs_location],
[(yyloc)])
# b4_rhs_location(RULE-LENGTH, NUM)
# ---------------------------------
# Expansion of @NUM, where the current rule has RULE-LENGTH symbols
# on RHS.
m4_define([b4_rhs_location],
[(yylocation_stack_@{($1) - ($2)@})])
# b4_parse_param_decl
# -------------------
# Extra formal arguments of the constructor.
# Change the parameter names from "foo" into "foo_yyarg", so that
# there is no collision bw the user chosen attribute name, and the
# argument name in the constructor.
m4_define([b4_parse_param_decl],
[m4_ifset([b4_parse_param],
[m4_map_sep([b4_parse_param_decl_1], [, ], [b4_parse_param])])])
m4_define([b4_parse_param_decl_1],
[$1_yyarg])
# b4_parse_param_cons
# -------------------
# Extra initialisations of the constructor.
m4_define([b4_parse_param_cons],
[m4_ifset([b4_parse_param],
[
b4_cc_constructor_calls(b4_parse_param)])])
m4_define([b4_cc_constructor_calls],
[m4_map_sep([b4_cc_constructor_call], [,
], [$@])])
m4_define([b4_cc_constructor_call],
[$2 ($2_yyarg)])
# b4_parse_param_vars
# -------------------
# Extra instance variables.
m4_define([b4_parse_param_vars],
[m4_ifset([b4_parse_param],
[
// User arguments.
b4_cc_var_decls(b4_parse_param)])])
m4_define([b4_cc_var_decls],
[m4_map_sep([b4_cc_var_decl], [
], [$@])])
m4_define([b4_cc_var_decl],
[ $1;])
## ---------##
## Values. ##
## ---------##
# b4_yylloc_default_define
# ------------------------
# Define YYLLOC_DEFAULT.
m4_define([b4_yylloc_default_define],
[[/* YYLLOC_DEFAULT -- Set CURRENT to span from RHS[1] to RHS[N].
If N is 0, then set CURRENT to the empty location which ends
the previous symbol: RHS[0] (always defined). */
# ifndef YYLLOC_DEFAULT
# define YYLLOC_DEFAULT(Current, Rhs, N) \
do \
if (N) \
{ \
(Current).begin = YYRHSLOC (Rhs, 1).begin; \
(Current).end = YYRHSLOC (Rhs, N).end; \
} \
else \
{ \
(Current).begin = (Current).end = YYRHSLOC (Rhs, 0).end; \
} \
while (/*CONSTCOND*/ false)
# endif
]])
## -------- ##
## Checks. ##
## -------- ##
b4_token_ctor_if([b4_variant_if([],
[b4_fatal_at(b4_percent_define_get_loc(api.token.constructor),
[cannot use '%s' without '%s'],
[%define api.token.constructor],
[%define api.value.type variant]))])])