m4_include(b4_pkgdatadir/[c++.m4])
+# b4_subtract(LHS, RHS)
+# ---------------------
+# Evaluate LHS - RHS if they are integer literals, otherwise expand
+# to (LHS) - (RHS).
+m4_define([b4_subtract],
+[m4_bmatch([$1$2], [^[0123456789]*$],
+ [m4_eval([$1 - $2])],
+ [($1) - ($2)])])
+
+
+# b4_args(ARG1, ...)
+# _b4_args(ARG1, ...)
+# -------------------
+# Join with comma, skipping empty arguments.
+# b4_args calls itself recursively until it sees the first non-empty
+# argument, then calls _b4_args which prepends each non-empty argument
+# with a comma.
+m4_define([b4_args],
+[m4_if([$#$1],
+ [1], [],
+ [m4_ifval([$1],
+ [$1[]_$0(m4_shift($@))],
+ [$0(m4_shift($@))])])])
+
+# _b4_args(ARGS1, ...)
+# --------------------
+m4_define([_b4_args],
+[m4_if([$#$1],
+ [1], [],
+ [m4_ifval([$1], [, $1])[]$0(m4_shift($@))])])
+
+
# b4_table_define(TABLE-NAME, CONTENT)
# ------------------------------------
# Define "parser::yy<TABLE-NAME>_" which contents is CONTENT.
]) # b4_variant_if
+# b4_lex_symbol_if([IF-YYLEX-RETURNS-A-COMPLETE-SYMBOL], [IF-NOT])
+# ----------------------------------------------------------------
+m4_define([b4_lex_symbol_if],
+[b4_percent_define_ifdef([[lex_symbol]], [$1], [$2])])
+
+
# b4_assert_if([IF-ASSERTIONS-ARE-USED], [IF-NOT])
# ------------------------------------------------
m4_define([b4_assert_if],
# Return the data corresponding to the symbol #NUM, where the current
# rule has RULE-LENGTH symbols on RHS.
m4_define([b4_rhs_data],
- [yystack_@{($1) - ($2)@}])
+ [yystack_@{b4_subtract($@)@}])
# b4_rhs_state(RULE-LENGTH, NUM)
[b4_rhs_data([$1], [$2]).location])
+# b4_symbol_(NUM, FIELD)
+# ----------------------
+# Recover a FIELD about symbol #NUM. Thanks to m4_indir, fails if
+# undefined.
+m4_define([b4_symbol_],
+[m4_indir([b4_symbol($1, $2)])])
+
+
# b4_symbol(NUM, FIELD)
# ---------------------
# Recover a FIELD about symbol #NUM. Thanks to m4_indir, fails if
-# undefined.
+# undefined. If FIELD = id, prepend the prefix.
m4_define([b4_symbol],
-[m4_indir([b4_symbol($1, $2)])])
+[m4_case([$2],
+ [id], [m4_do([b4_percent_define_get([token.prefix])],
+ [b4_symbol_([$1], [id])])],
+ [b4_symbol_($@)])])
+
+
+# b4_symbol_if(NUM, FIELD, IF-TRUE, IF-FALSE)
+# -------------------------------------------
+# If FIELD about symbol #NUM is 1 expand IF-TRUE, if is 0, expand IF-FALSE.
+# Otherwise an error.
+m4_define([b4_symbol_if],
+[m4_case(b4_symbol([$1], [$2]),
+ [1], [$3],
+ [0], [$4],
+ [m4_fatal([$0: field $2 of $1 is not a Boolean:] b4_symbol([$1], [$2]))])])
# b4_symbol_actions(FILENAME, LINENO,
# b4_type_action_(NUMS)
# ---------------------
# Run actions for the symbol NUMS that all have the same type-name.
+# Skip NUMS that have no type-name.
m4_define([b4_type_action_],
+[b4_symbol_if([$1], [has_type],
[m4_map([b4_symbol_case_], [$@])[]dnl
b4_dollar_dollar([b4_symbol([$1], [number])],
[b4_symbol([$1], [tag])],
- [b4_symbol([$1], [type_name])]);
+ [b4_symbol([$1], [type])]);
break;
-])
+])])
+
+
+# b4_symbol_constructor_declaration_(SYMBOL-NUMBER)
+# -------------------------------------------------
+# Declare the overloaded version of make_symbol for the (common) type of
+# these SYMBOL-NUMBERS. Use at class-level.
+m4_define([b4_symbol_constructor_declaration_],
+[b4_symbol_if([$1], [is_token], [b4_symbol_if([$1], [has_id],
+[ static inline
+ symbol_type
+ make_[]b4_symbol_([$1], [id]) (dnl
+b4_args(b4_symbol_if([$1], [has_type],
+ [const b4_symbol([$1], [type])& v]),
+ b4_locations_if([const location_type& l])));
+
+])])])
+
+
+# b4_symbol_constructor_declarations
+# ----------------------------------
+# Declare symbol constructors for all the value types.
+# Use at class-level.
+m4_define([b4_symbol_constructor_declarations],
+[b4_variant_if([
+ // Symbol constructors declarations.
+m4_map([b4_symbol_constructor_declaration_], m4_defn([b4_symbol_numbers]))])])
+
+
+
+# b4_symbol_constructor_definition_(SYMBOL-NUMBER)
+# ------------------------------------------------
+# Define symbol constructor for this SYMBOL-NUMBER.
+m4_define([b4_symbol_constructor_definition_],
+[b4_symbol_if([$1], [is_token], [b4_symbol_if([$1], [has_id],
+[ b4_parser_class_name::symbol_type
+ b4_parser_class_name::make_[]b4_symbol_([$1], [id]) (dnl
+b4_args(b4_symbol_if([$1], [has_type],
+ [const b4_symbol([$1], [type])& v]),
+ b4_locations_if([const location_type& l])))
+ {
+ return symbol_type (b4_args([yytranslate_ (token::b4_symbol([$1], [id]))],
+ b4_symbol_if([$1], [has_type], [v]),
+ b4_locations_if([l])));
+ }
+
+])])])
+
+
+# b4_symbol_constructor_definitions
+# ----------------------------------
+# Define the overloaded versions of make_symbol for all the value types.
+m4_define([b4_symbol_constructor_definitions],
+[[ // symbol_base_type.
+ template <typename Exact>
+ ]b4_parser_class_name[::symbol_base_type<Exact>::symbol_base_type ()
+ : value()]b4_locations_if([
+ , location()])[
+ {
+ }]b4_locations_if([[
+
+ template <typename Exact>
+ ]b4_parser_class_name[::symbol_base_type<Exact>::symbol_base_type (const location_type& l)
+ : value()
+ , location(l)
+ {
+ }]])[
+
+ template <typename Exact>
+ ]b4_parser_class_name[::symbol_base_type<Exact>::symbol_base_type (]b4_args(
+ [const semantic_type& v],
+ b4_locations_if([const location_type& l]))[)
+ : value(v)]b4_locations_if([
+ , location(l)])[
+ {
+ }
+
+ template <typename Exact>
+ const Exact&
+ ]b4_parser_class_name[::symbol_base_type<Exact>::self () const
+ {
+ return static_cast<const Exact&>(*this);
+ }
+
+ template <typename Exact>
+ Exact&
+ ]b4_parser_class_name[::symbol_base_type<Exact>::self ()
+ {
+ return static_cast<Exact&>(*this);
+ }
+
+ template <typename Exact>
+ int
+ ]b4_parser_class_name[::symbol_base_type<Exact>::type_get () const
+ {
+ return self ().type_get_ ();
+ }
+
+ // symbol_type.
+ ]b4_parser_class_name[::symbol_type::symbol_type ()
+ : super_type ()
+ , type ()
+ {
+ }
+
+ ]b4_parser_class_name[::symbol_type::symbol_type (]b4_args(
+ [int t],
+ b4_locations_if([const location_type& l]))[)
+ : super_type (]b4_locations_if([l])[)
+ , type (t)
+ {
+ }
+
+ ]b4_parser_class_name[::symbol_type::symbol_type (]b4_args(
+ [int t],
+ [const semantic_type& v],
+ b4_locations_if([const location_type& l]))[)
+ : super_type (v]b4_locations_if([, l])[)
+ , type (t)
+ {
+ }
+
+ int
+ ]b4_parser_class_name[::symbol_type::type_get_ () const
+ {
+ return type;
+ }
+]b4_lex_symbol_if([[
+ ]b4_parser_class_name[::token_type
+ ]b4_parser_class_name[::symbol_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]);
+ }
+]])[
+
+]b4_variant_if(
+[ // Implementation of make_symbol for each symbol type.
+m4_map([b4_symbol_constructor_definition_], m4_defn([b4_symbol_numbers]))])])
# b4_symbol_variant(YYTYPE, YYVAL, ACTION, [ARGS])
dummy[]_b4_char_sizeof_counter])
-# b4_char_sizeof(SYMBOL-NUM)
+# b4_char_sizeof_(SYMBOL-NUM)
+# ---------------------------
+# A comment describing this symbol.
+m4_define([b4_char_sizeof_],
+[ // b4_symbol([$1], [tag])
+])
+
+# b4_char_sizeof(SYMBOL-NUMS)
# --------------------------
# To be mapped on the list of type names to produce:
#
# char dummy2[sizeof(type_name_2)];
#
# for defined type names.
-# $3 is doubly-quoted, do not quote it again.
m4_define([b4_char_sizeof],
-[m4_ifval(b4_symbol([$1], [type_name]),
+[b4_symbol_if([$1], [has_type],
[
- char _b4_char_sizeof_dummy@{sizeof([b4_symbol([$1], [type_name])])@}; // b4_symbol([$1], [tag])])dnl
-])
+m4_map([b4_char_sizeof_], [$@])dnl
+ char _b4_char_sizeof_dummy@{sizeof([b4_symbol([$1], [type])])@};
+])])
+
+
+# b4_yytranslate_definition
+# -------------------------
+# Define yytranslate_. Sometimes we want it in the header file,
+# sometimes the cc file suffices.
+m4_define([b4_yytranslate_definition],
+[[ // Symbol number corresponding to token number t.
+ ]b4_parser_class_name[::token_number_type
+ ]b4_parser_class_name[::yytranslate_ (]b4_lex_symbol_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_;
+ }
+]])
m4_pushdef([b4_copyright_years],
b4_defines_if([],
[b4_fatal([b4_skeleton[: using %%defines is mandatory]])])
-# Backward compatibility.
+b4_locations_if(
+[# Backward compatibility.
m4_define([b4_location_constructors])
-m4_include(b4_pkgdatadir/[location.cc])
+m4_include(b4_pkgdatadir/[location.cc])])
# We do want M4 expansion after # for CPP macros.
m4_changecom()
m4_divert_push(0)dnl
-b4_defines_if(
-[@output(b4_spec_defines_file@)@
+@output(b4_spec_defines_file@)@
b4_copyright([Skeleton interface for Bison LALR(1) parsers in C++])
dnl FIXME: This is wrong, we want computed header guards.
[
#include "stack.hh"
]b4_namespace_open[
- class position;
- class location;
+]b4_locations_if([ class position;
+ class location;])[
]b4_variant_if(
[[
/// A char[S] buffer to store and retrieve objects.
{]b4_assert_if([
/// Whether something is contained.
bool built;
-
- /// Initially uninitialized.
- variant ()
- : built(false)
- {}])[
+])[
+ /// Empty construction.
+ inline
+ variant ()]b4_assert_if([
+ : built(false)])[
+ {}
/// Instantiate a \a T in here.
template <typename T>
return *new (buffer) T(t);
}
+ /// Construct and fill.
+ template <typename T>
+ inline
+ variant (const T& t)]b4_assert_if([
+ : built(true)])[
+ {
+ new (buffer) T(t);
+ }
+
/// Accessor to a built \a T.
template <typename T>
inline T&
]])[
]b4_namespace_close[
-#include "location.hh"
+]b4_locations_if([#include "location.hh"])[
/* Enabling traces. */
#ifndef YYDEBUG
# define YYTOKEN_TABLE ]b4_token_table[
#endif
-/* YYLLOC_DEFAULT -- Set CURRENT to span from RHS[1] to RHS[N].
+]b4_locations_if([dnl
+[/* 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). */
(Current).begin = (Current).end = (Rhs)[0].location.end; \
} \
} while (false)
-#endif
+#endif]])[
]b4_namespace_open[
]b4_variant_if(
[ /// An auxiliary type to compute the largest semantic type.
union union_type
- {]m4_map([b4_char_sizeof], m4_defn([b4_symbol_numbers]))[
- };
+ {]m4_map([b4_char_sizeof], m4_defn([b4_type_names]))[};
/// Symbol semantic values.
typedef variant<sizeof(union_type)> semantic_type;],
[[ typedef YYSTYPE semantic_type;]])])])[
#else
typedef YYSTYPE semantic_type;
-#endif
+#endif]b4_locations_if([
/// Symbol locations.
- typedef ]b4_percent_define_get([[location_type]])[ location_type;
+ typedef b4_percent_define_get([[location_type]]) location_type;])[
/// Tokens.
struct token
{
#endif
private:
- /// Report a syntax error.
- /// \param loc where the syntax error is found.
+ /// Report a syntax error.]b4_locations_if([
+ /// \param loc where the syntax error is found.])[
/// \param msg a description of the syntax error.
- virtual void error (const location_type& loc, const std::string& msg);
+ virtual void error (]b4_locations_if([const location_type& loc, ])[const std::string& msg);
/// Generate an error message.
/// \param state the state where the error occurred.
#if YYDEBUG || YYERROR_VERBOSE || YYTOKEN_TABLE
/// For a symbol, its name in clear.
static const char* const yytname_[];
-#endif
+#endif]b4_error_verbose_if([
-#if YYERROR_VERBOSE
/// Convert the symbol name \a n to a form suitable for a diagnostic.
- virtual std::string yytnamerr_ (const char *n);
-#endif
+ static std::string yytnamerr_ (const char *n);])[
#if YYDEBUG
/// For each rule, its source line number.
static const ]b4_int_type_for([b4_rline])[ yyrline_[];
- /// For each scanner token number, its symbol number.
- static const ]b4_int_type_for([b4_toknum])[ yytoken_number_[];
/// Report on the debug stream that the rule \a r is going to be reduced.
virtual void yy_reduce_print_ (int r);
/// Print the state stack on the debug stream.
#endif
/// Convert a scanner token number \a t to a symbol number.
- static inline token_number_type yytranslate_ (int t);
+ static inline token_number_type yytranslate_ (]b4_lex_symbol_if([token_type], [int])[ t);
/// A complete symbol, with its type.
template <typename Exact>
/// Default constructor.
inline symbol_base_type ();
- /// Constructor.
- inline symbol_base_type (const semantic_type& v, const location_type& l);
+ /// Constructor.]b4_locations_if([
+ inline symbol_base_type (const location_type& l)])[;
+ inline symbol_base_type (]b4_args(
+ [const semantic_type& v],
+ b4_locations_if([const location_type& l]))[);
/// Return this with its exact type.
const Exact& self () const;
int type_get () const;
/// The semantic value.
- semantic_type value;
+ semantic_type value;]b4_locations_if([
/// The location.
- location_type location;
+ location_type location;])[
};
#if YYDEBUG
inline void yy_destroy_ (const char* yymsg,
symbol_base_type<Exact>& yysym) const;
+ public:
/// Element of the stack: a state and its attributes.
struct symbol_type : symbol_base_type<symbol_type>
{
inline symbol_type ();
/// Constructor.
- inline symbol_type (int t,
- const semantic_type& v, const location_type& l);
+ inline symbol_type (]b4_args([int t],
+ [const semantic_type& v],
+ b4_locations_if([const location_type& l]))[);
+
+ inline symbol_type (]b4_args([int t],
+ b4_locations_if([const location_type& l]))[);
/// The symbol type.
int type;
/// Return the type corresponding to this state.
inline int type_get_ () const;
+
+ /// Its token.
+ inline token_type token () const;
};
+]b4_symbol_constructor_declarations[
+
+ private:
/// Element of the stack: a state and its attributes.
struct stack_symbol_type : symbol_base_type<stack_symbol_type>
{
inline stack_symbol_type ();
/// Constructor.
- inline stack_symbol_type (state_type s,
- const semantic_type& v, const location_type& l);
+ inline stack_symbol_type (]b4_args([state_type s],
+ [const semantic_type& v],
+ b4_locations_if([const location_type& l]))[);
/// The state.
state_type state;
]b4_parse_param_vars[
};
+]b4_lex_symbol_if([b4_yytranslate_definition])[
+]b4_lex_symbol_if([b4_symbol_constructor_definitions])[
]b4_namespace_close[
]b4_percent_define_flag_if([[global_tokens_and_yystype]],
b4_percent_code_get([[provides]])[]dnl
[#endif /* ! defined PARSER_HEADER_H */]
-])dnl
@output(b4_parser_file_name@)@
b4_copyright([Skeleton implementation for Bison LALR(1) parsers in C++])
b4_percent_code_get([[top]])[]dnl
#define yylex b4_prefix[]lex])[
/* First part of user declarations. */
-]b4_user_pre_prologue
+]b4_user_pre_prologue[
-b4_defines_if([[
-#include "@basename(]b4_spec_defines_file[@)"]])[
+#include "@basename(]b4_spec_defines_file[@)"
/* User implementation prologue. */
]b4_user_post_prologue
#endif /* !YYDEBUG */
-#define yyerrok (yyerrstatus_ = 0)
-#define yyclearin (yychar = yyempty_)
+#define yyerrok (yyerrstatus_ = 0)
+#define yyclearin (yyempty = true)
-#define YYACCEPT goto yyacceptlab
-#define YYABORT goto yyabortlab
-#define YYERROR goto yyerrorlab
+#define YYACCEPT goto yyacceptlab
+#define YYABORT goto yyabortlab
+#define YYERROR goto yyerrorlab
#define YYRECOVERING() (!!yyerrstatus_)
-]b4_namespace_open[
-#if YYERROR_VERBOSE
+]b4_namespace_open[]b4_error_verbose_if([[
/* Return YYSTR after stripping away unnecessary quotes and
backslashes, so that it's suitable for yyerror. The heuristic is
return yystr;
}
-
-#endif
+]])[
/// Build a parser object.
]b4_parser_class_name::b4_parser_class_name[ (]b4_parse_param_decl[)]m4_ifset([b4_parse_param], [
| Symbol types. |
`---------------*/
- // symbol_base_type.
- template <typename Exact>
- ]b4_parser_class_name[::symbol_base_type<Exact>::symbol_base_type ()
- : value()
- , location()
- {
- }
-
- template <typename Exact>
- ]b4_parser_class_name[::symbol_base_type<Exact>::symbol_base_type (const semantic_type& v, const location_type& l)
- : value(v)
- , location(l)
- {
- }
-
- template <typename Exact>
- const Exact&
- ]b4_parser_class_name[::symbol_base_type<Exact>::self () const
- {
- return static_cast<const Exact&>(*this);
- }
-
- template <typename Exact>
- Exact&
- ]b4_parser_class_name[::symbol_base_type<Exact>::self ()
- {
- return static_cast<Exact&>(*this);
- }
-
- template <typename Exact>
- int
- ]b4_parser_class_name[::symbol_base_type<Exact>::type_get () const
- {
- return self ().type_get_ ();
- }
-
- // symbol_type.
- ]b4_parser_class_name[::symbol_type::symbol_type ()
- : super_type ()
- , type ()
- {
- }
-
- ]b4_parser_class_name[::symbol_type::symbol_type (int t,
- const semantic_type& v, const location_type& l)
- : super_type (v, l)
- , type (t)
- {
- }
-
- int
- ]b4_parser_class_name[::symbol_type::type_get_ () const
- {
- return type;
- }
+]b4_lex_symbol_if([], [b4_symbol_constructor_definitions])[
// stack_symbol_type.
]b4_parser_class_name[::stack_symbol_type::stack_symbol_type ()
{
}
- ]b4_parser_class_name[::stack_symbol_type::stack_symbol_type (state_type s,
- const semantic_type& v, const location_type& l)
- : super_type (v, l)
+ ]b4_parser_class_name[::stack_symbol_type::stack_symbol_type (]b4_args(
+ [state_type s],
+ [const semantic_type& v],
+ b4_locations_if([const location_type& l]))[)
+ : super_type (v]b4_locations_if([, l])[)
, state (s)
{
}
{
int yytype = yysym.type_get ();
yyo << (yytype < yyntokens_ ? "token" : "nterm")
- << ' ' << yytname_[yytype] << " ("
- << yysym.location << ": ";
+ << ' ' << yytname_[yytype] << " ("]b4_locations_if([
+ << yysym.location << ": "])[;
switch (yytype)
{
]m4_map([b4_symbol_actions], m4_defn([b4_symbol_printers]))[
if (m)
YY_SYMBOL_PRINT (m, sym);
]b4_variant_if(
-[[ yystack_.push (stack_symbol_type (s, semantic_type(), sym.location));
+[[ yystack_.push (stack_symbol_type (]b4_args(
+ [s],
+ [semantic_type()],
+ b4_locations_if([sym.location]))[));
]b4_symbol_variant([[yystos_[s]]], [[yystack_[0].value]],
[build], [sym.value])],
-[ yystack_.push (stack_symbol_type (s, sym.value, sym.location));])[
+[[ yystack_.push (stack_symbol_type (]b4_args(
+ [s],
+ [sym.value],
+ b4_locations_if([sym.location]))[));]])[
}
void
if (m)
YY_SYMBOL_PRINT (m, s);
]b4_variant_if(
-[[ yystack_.push (stack_symbol_type (s.state, semantic_type(), s.location));
+[[ yystack_.push (stack_symbol_type (]b4_args(
+ [s.state],
+ [semantic_type()],
+ b4_locations_if([s.location]))[));
]b4_symbol_variant([[yystos_[s.state]]], [[yystack_[0].value]],
[build], [s.value])],
[ yystack_.push (s);])[
int
]b4_parser_class_name[::parse ()
{
- /// Coded type of the lookahead.
- int yychar = yyempty_;
+ /// Whether yyla contains a lookahead.
+ bool yyempty = true;
/* State. */
int yyn;
int yyerrstatus_ = 0;
/// The lookahead symbol.
- symbol_type yyla;
+ symbol_type yyla;]b4_locations_if([[
/// The locations where the error started and ended.
- stack_symbol_type yyerror_range[2];
+ stack_symbol_type yyerror_range[2];]])[
/// $$ and @@$.
stack_symbol_type yylhs;
goto yydefault;
/* Read a lookahead token. */
- if (yychar == yyempty_)
+ if (yyempty)
{
- YYCDEBUG << "Reading a token: ";
- yychar = ]b4_c_function_call([yylex], [int],
+ YYCDEBUG << "Reading a token: ";
+]b4_lex_symbol_if(
+[ yyla = b4_c_function_call([yylex], [symbol_type],
+ m4_ifdef([b4_lex_param], b4_lex_param));],
+[ yyla.type = yytranslate_ (b4_c_function_call([yylex], [int],
[[YYSTYPE*], [&yyla.value]][]dnl
b4_locations_if([, [[location*], [&yyla.location]]])dnl
-m4_ifdef([b4_lex_param], [, ]b4_lex_param))[;
- }
-
-
- /* Convert token to internal form. */
- if (yychar <= yyeof_)
- {
- yychar = yyla.type = yyeof_;
- YYCDEBUG << "Now at end of input." << std::endl;
- }
- else
- {
- yyla.type = yytranslate_ (yychar);
- YY_SYMBOL_PRINT ("Next token is", yyla);
+m4_ifdef([b4_lex_param], [, ]b4_lex_param)));])[
+ yyempty = false;
}
+ YY_SYMBOL_PRINT ("Next token is", yyla);
/* If the proper action on seeing token YYLA.TYPE is to reduce or
to detect an error, take that action. */
}
/* Discard the token being shifted. */
- yychar = yyempty_;
+ yyempty = true;
/* Count tokens shifted since error; after three, turn off error
status. */
yylhs.value = yystack_@{yylen - 1@}.value;
else
yylhs.value = yystack_@{0@}.value;])[
-
+]b4_locations_if([dnl
+[
// Compute the default @@$.
{
slice<stack_symbol_type, stack_type> slice (yystack_, yylen);
YYLLOC_DEFAULT (yylhs.location, slice, yylen);
- }
+ }]])[
// Perform the reduction.
YY_REDUCE_PRINT (yyn);
if (!yyerrstatus_)
{
++yynerrs_;
- error (yyla.location, yysyntax_error_ (yystate, yyla.type));
+ error (]b4_args(b4_locations_if([yyla.location]),
+ [yysyntax_error_ (yystate, yyla.type)])[);
}
- yyerror_range[0].location = yyla.location;
+]b4_locations_if([[
+ yyerror_range[0].location = yyla.location;]])[
if (yyerrstatus_ == 3)
{
/* If just tried and failed to reuse lookahead token after an
- error, discard it. */
-
- if (yychar <= yyeof_)
- {
- /* Return failure if at end of input. */
- if (yychar == yyeof_)
- YYABORT;
- }
- else
- {
- yy_destroy_ ("Error: discarding", yyla);
- yychar = yyempty_;
+ error, discard it. */
+
+ /* Return failure if at end of input. */
+ if (yyla.type == yyeof_)
+ YYABORT;
+ else
+ {
+ yy_destroy_ ("Error: discarding", yyla);
+ yyempty = true;
}
}
if (false)
goto yyerrorlab;
- yyerror_range[0].location = yystack_[yylen - 1].location;
+]b4_locations_if([[
+ yyerror_range[0].location = yystack_[yylen - 1].location;]])[
/* Do not reclaim the symbols of the rule which action triggered
this YYERROR. */
yypop_ (yylen);
// Pop the current state because it cannot handle the error token.
if (yystack_.size () == 1)
YYABORT;
-
- yyerror_range[0].location = yystack_[0].location;
+]b4_locations_if([[
+ yyerror_range[0].location = yystack_[0].location;]])[
yy_destroy_ ("Error: popping", yystack_[0]);
yypop_ ();
yystate = yystack_[0].state;
YY_STACK_PRINT ();
}
-
+]b4_locations_if([[
yyerror_range[1].location = yyla.location;
- YYLLOC_DEFAULT (error_token.location, (yyerror_range - 1), 2);
+ YYLLOC_DEFAULT (error_token.location, (yyerror_range - 1), 2);]])[
/* Shift the error token. */
error_token.state = yystate = yyn;
goto yyreturn;
yyreturn:
- if (yychar != yyempty_)
+ if (!yyempty)
yy_destroy_ ("Cleanup: discarding lookahead", yyla);
/* Do not reclaim the symbols of the rule which action triggered
// Generate an error message.
std::string
- ]b4_parser_class_name[::yysyntax_error_ (int yystate, int]dnl
-b4_error_verbose_if([ tok])[)
+ ]b4_parser_class_name[::yysyntax_error_ (]dnl
+b4_error_verbose_if([int yystate, int yytoken],
+ [int, int])[)
{
- std::string res;
- YYUSE (yystate);
-#if YYERROR_VERBOSE
+ std::string yyres;]b4_error_verbose_if([[
int yyn = yypact_[yystate];
if (yypact_ninf_ < yyn && yyn <= yylast_)
{
/* Stay within bounds of both yycheck and yytname. */
int yychecklim = yylast_ - yyn + 1;
int yyxend = yychecklim < yyntokens_ ? yychecklim : yyntokens_;
- int count = 0;
- for (int x = yyxbegin; x < yyxend; ++x)
- if (yycheck_[x + yyn] == x && x != yyterror_)
- ++count;
-
- // FIXME: This method of building the message is not compatible
- // with internationalization. It should work like yacc.c does it.
- // That is, first build a string that looks like this:
- // "syntax error, unexpected %s or %s or %s"
- // Then, invoke YY_ on this string.
- // Finally, use the string as a format to output
- // yytname_[tok], etc.
- // Until this gets fixed, this message appears in English only.
- res = "syntax error, unexpected ";
- res += yytnamerr_ (yytname_[tok]);
- if (count < 5)
- {
- count = 0;
- for (int x = yyxbegin; x < yyxend; ++x)
- if (yycheck_[x + yyn] == x && x != yyterror_)
- {
- res += (!count++) ? ", expecting " : " or ";
- res += yytnamerr_ (yytname_[x]);
- }
- }
+
+ // Number of "expected" tokens.
+ size_t yycount = 0;
+ // Its maximum.
+ enum { YYERROR_VERBOSE_ARGS_MAXIMUM = 5 };
+ // Arguments of yyformat.
+ char const *yyarg[YYERROR_VERBOSE_ARGS_MAXIMUM];
+ yyarg[yycount++] = yytname_[yytoken];
+ for (int yyx = yyxbegin; yyx < yyxend; ++yyx)
+ if (yycheck_[yyx + yyn] == yyx && yyx != yyterror_)
+ {
+ if (yycount == YYERROR_VERBOSE_ARGS_MAXIMUM)
+ {
+ yycount = 1;
+ break;
+ }
+ else
+ yyarg[yycount++] = yytname_[yyx];
+ }
+
+ char const* yyformat = 0;
+ switch (yycount)
+ {
+#define YYCASE_(N, S) \
+ case N: \
+ yyformat = S; \
+ break
+ YYCASE_(1, YY_("syntax error, unexpected %s"));
+ YYCASE_(2, YY_("syntax error, unexpected %s, expecting %s"));
+ YYCASE_(3, YY_("syntax error, unexpected %s, expecting %s or %s"));
+ YYCASE_(4, YY_("syntax error, unexpected %s, expecting %s or %s or %s"));
+ YYCASE_(5, YY_("syntax error, unexpected %s, expecting %s or %s or %s or %s"));
+#undef YYCASE_
+ }
+ // Argument number.
+ size_t yyi = 0;
+ for (char const* yyp = yyformat; *yyp; ++yyp)
+ if (yyp[0] == '%' && yyp[1] == 's' && yyi < yycount)
+ {
+ yyres += yytnamerr_ (yyarg[yyi++]);
+ ++yyp;
+ }
+ else
+ yyres += *yyp;
}
else
-#endif
- res = YY_("syntax error");
- return res;
+ ]])dnl
+[ yyres = YY_("syntax error");
+ return yyres;
}
symbol of state STATE-NUM. */
]b4_table_define([stos], [b4_stos])[;
-#if YYDEBUG
- /* TOKEN_NUMBER_[YYLEX-NUM] -- Internal symbol number corresponding
- to YYLEX-NUM. */
- ]b4_table_define([token_number], [b4_toknum])[;
-#endif
-
/* YYR1[YYN] -- Symbol number of symbol that rule YYN derives. */
]b4_table_define([r1], [b4_r1])[;
}
#endif // YYDEBUG
- /* YYTRANSLATE(YYLEX) -- Bison symbol number corresponding to YYLEX. */
- ]b4_parser_class_name[::token_number_type
- ]b4_parser_class_name[::yytranslate_ (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<unsigned int> (t) <= user_token_number_max_)
- return translate_table[t];
- else
- return undef_token_;
- }
-
+]b4_lex_symbol_if([], [b4_yytranslate_definition])[
]b4_namespace_close[
]b4_epilogue[]dnl
projects / bison.git / blobdiff