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api.value.type: use keyword/brace values

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Suggested by Joel E. Denny.
http://lists.gnu.org/archive/html/bison-patches/2013-03/msg00016.html

* data/bison.m4 (b4_percent_define_get_kind): New.
(b4_variant_flag): Check that api.value.type is defined as the 'variant'
keyword value.
* data/c.m4 (_b4_value_type_setup_keyword): New.
(b4_value_type_setup): Use it to simplify reading.
Use b4_define_silent.
Decode api.value.type, including its type.
(b4_value_type_define): Likewise.
* data/c++.m4 (b4_value_type_declare): Adjust the decoding of api.value.type,
taking its kind into account.
* doc/bison.texi: Adjust all the examples to the new syntax.
* NEWS: Ditto.
* tests/types.at: Adjust
This commit is contained in:
Akim Demaille
2013-04-05 14:40:25 +02:00
parent 1fa19a7697
commit 435575cb5e
6 changed files with 105 additions and 51 deletions
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16
doc/bison.texi
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@@ -1555,7 +1555,7 @@ calculator. As in C, comments are placed between @samp{/*@dots{}*/}.
%@}
@end group
%define api.value.type double
%define api.value.type @{double@}
%token NUM
%% /* Grammar rules and actions follow. */
@@ -1582,9 +1582,9 @@ thus specifying the C data type for semantic values of both tokens and
groupings (@pxref{Value Type, ,Data Types of Semantic Values}). The Bison
parser will use whatever type @code{api.value.type} is defined as; if you
don't define it, @code{int} is the default. Because we specify
@code{double}, each token and each expression has an associated value, which
is a floating point number. C code can use @code{YYSTYPE} to refer to the
value @code{api.value.type}.
@samp{@{double@}}, each token and each expression has an associated value,
which is a floating point number. C code can use @code{YYSTYPE} to refer to
the value @code{api.value.type}.
Each terminal symbol that is not a single-character literal must be
declared. (Single-character literals normally don't need to be declared.)
@@ -1806,7 +1806,7 @@ The semantic value of the token (if it has one) is stored into the
global variable @code{yylval}, which is where the Bison parser will look
for it. (The C data type of @code{yylval} is @code{YYSTYPE}, whose value
was defined at the beginning of the grammar via @samp{%define api.value.type
double}; @pxref{Rpcalc Declarations,,Declarations for @code{rpcalc}}.)
@{double@}}; @pxref{Rpcalc Declarations,,Declarations for @code{rpcalc}}.)
A token type code of zero is returned if the end-of-input is encountered.
(Bison recognizes any nonpositive value as indicating end-of-input.)
@@ -2004,7 +2004,7 @@ parentheses nested to arbitrary depth. Here is the Bison code for
@group
/* Bison declarations. */
%define api.value.type double
%define api.value.type @{double@}
%token NUM
%left '-' '+'
%left '*' '/'
@@ -3670,14 +3670,14 @@ specify some other type, define the @code{%define} variable
@code{api.value.type} like this:
@example
%define api.value.type double
%define api.value.type @{double@}
@end example
@noindent
or
@example
%define api.value.type "struct semantic_type"
%define api.value.type @{struct semantic_type@}
@end example
The value of @code{api.value.type} should be a type name that does not