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news: convert to double quotes.

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* NEWS: Convert from `quoted' to "quoted".
Reported by Stefano Lattarini.
http://lists.gnu.org/archive/html/bison-patches/2012-05/msg00039.html
This commit is contained in:
Akim Demaille
2012-05-21 15:52:17 +02:00
parent 08f6341c01
commit e4ab12542b
1 changed files with 137 additions and 138 deletions
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275
NEWS
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@@ -5,8 +5,7 @@ Bison News
** Future changes: ** Future changes:
The next major release will drop support for generating parsers in The next major release will drop support for generating parsers in K&R C.
K&R C.
** yacc.c: YYBACKUP works as expected. ** yacc.c: YYBACKUP works as expected.
@@ -14,29 +13,29 @@ Bison News
*** Location support is eliminated when not requested: *** Location support is eliminated when not requested:
GLR parsers used to include location-related code even when GLR parsers used to include location-related code even when locations were
locations were not requested, and therefore not even usable. not requested, and therefore not even usable.
*** __attribute__ is preserved: *** __attribute__ is preserved:
__attribute__ is no longer disabled when __STRICT_ANSI__ is defined __attribute__ is no longer disabled when __STRICT_ANSI__ is defined (i.e.,
(i.e., when -std is passed to GCC). when -std is passed to GCC).
** lalr1.java: several fixes: ** lalr1.java: several fixes:
The Java parser no longer throws ArrayIndexOutOfBoundsException if The Java parser no longer throws ArrayIndexOutOfBoundsException if the
the first token leads to a syntax error. Some minor clean ups. first token leads to a syntax error. Some minor clean ups.
** C++11 compatibility: ** C++11 compatibility:
C and C++ parsers use nullptr instead of 0 when __cplusplus is C and C++ parsers use "nullptr" instead of "0" when __cplusplus is 201103L
201103L or higher. or higher.
** C++ locations: ** C++ locations:
The position and location constructors (and their initialize The position and location constructors (and their initialize methods)
methods) accept new arguments for line and column. Several issues accept new arguments for line and column. Several issues in the
in the documentation were fixed. documentation were fixed.
** liby is no longer asking for "rpl_fprintf" on some platforms. ** liby is no longer asking for "rpl_fprintf" on some platforms.
@@ -44,41 +43,37 @@ Bison News
*** %printer is documented *** %printer is documented
The %printer directive, supported since at least Bison 1.50, is The "%printer" directive, supported since at least Bison 1.50, is finally
finally documented. The %mfcalc example is extended to demonstrate documented. The "mfcalc" example is extended to demonstrate it.
its use of printer.
The C++ parsers now also support yyoutput (as an alias to For consistency with the C skeletons, the C++ parsers now also support
debug_stream ()) for consistency with the C skeletons. "yyoutput" (as an alias to "debug_stream ()").
*** Several improvements have been made: *** Several improvements have been made:
The layout for grammar excerpts was changed to a more compact The layout for grammar excerpts was changed to a more compact scheme.
scheme. Named references are motivated. The description of the Named references are motivated. The description of the automaton
automaton description file (*.output) is updated to the current description file (*.output) is updated to the current format. Incorrect
format. Incorrect index entries were fixed. Some other errors were index entries were fixed. Some other errors were fixed.
fixed.
** Building bison: ** Building bison:
*** Conflicting prototypes with recent/modified Flex. *** Conflicting prototypes with recent/modified Flex.
Fixed build problems with the current, unreleased, version of Flex, Fixed build problems with the current, unreleased, version of Flex, and
and some modified versions of 2.5.35, which have modified function some modified versions of 2.5.35, which have modified function prototypes.
prototypes.
*** Warnings during the build procedure have been eliminated. *** Warnings during the build procedure have been eliminated.
*** Several portability problems in the test suite have been fixed: *** Several portability problems in the test suite have been fixed:
This includes warnings with some compilers, unexpected behavior of This includes warnings with some compilers, unexpected behavior of tools
tools such as diff, warning messages from the test suite itself, such as diff, warning messages from the test suite itself, etc.
etc.
*** The install-pdf target work properly: *** The install-pdf target work properly:
Running "make install-pdf" (or -dvi, -html, -info, and -ps) no Running "make install-pdf" (or -dvi, -html, -info, and -ps) no longer
longer halts in the middle of its course. halts in the middle of its course.
* Changes in version 2.5 (2011-05-14): * Changes in version 2.5 (2011-05-14):
@@ -137,8 +132,8 @@ Bison News
%define lr.type canonical-lr %define lr.type canonical-lr
The default-reduction optimization in the parser tables can also be The default-reduction optimization in the parser tables can also be
adjusted using `%define lr.default-reductions'. For details on both adjusted using "%define lr.default-reductions". For details on both
of these features, see the new section `Tuning LR' in the Bison of these features, see the new section "Tuning LR" in the Bison
manual. manual.
These features are experimental. More user feedback will help to These features are experimental. More user feedback will help to
@@ -154,7 +149,7 @@ Bison News
cause error recovery to begin in a different syntactic context than cause error recovery to begin in a different syntactic context than
the one in which the invalid token was encountered. Second, when the one in which the invalid token was encountered. Second, when
verbose error messages are enabled (with %error-verbose or the verbose error messages are enabled (with %error-verbose or the
obsolete `#define YYERROR_VERBOSE'), the expected token list in the obsolete "#define YYERROR_VERBOSE"), the expected token list in the
syntax error message can both contain invalid tokens and omit valid syntax error message can both contain invalid tokens and omit valid
tokens. tokens.
@@ -179,7 +174,7 @@ Bison News
%define parse.lac full %define parse.lac full
See the new section `LAC' in the Bison manual for additional See the new section "LAC" in the Bison manual for additional
details including a few caveats. details including a few caveats.
LAC is an experimental feature. More user feedback will help to LAC is an experimental feature. More user feedback will help to
@@ -204,7 +199,7 @@ Bison News
except that the manner in which Bison processes multiple definitions except that the manner in which Bison processes multiple definitions
for the same NAME differs. Most importantly, -F and --force-define for the same NAME differs. Most importantly, -F and --force-define
quietly override %define, but -D and --define do not. For further quietly override %define, but -D and --define do not. For further
details, see the section `Bison Options' in the Bison manual. details, see the section "Bison Options" in the Bison manual.
*** Variables renamed: *** Variables renamed:
@@ -262,8 +257,8 @@ Bison News
Similarly to the C parsers, the C++ parsers now define the YYRHSLOC Similarly to the C parsers, the C++ parsers now define the YYRHSLOC
macro and use it in the default YYLLOC_DEFAULT. You are encouraged macro and use it in the default YYLLOC_DEFAULT. You are encouraged
to use it. If, for instance, your location structure has `first' to use it. If, for instance, your location structure has "first"
and `last' members, instead of and "last" members, instead of
# define YYLLOC_DEFAULT(Current, Rhs, N) \ # define YYLLOC_DEFAULT(Current, Rhs, N) \
do \ do \
@@ -334,7 +329,7 @@ Bison News
** Verbose syntax error message fixes: ** Verbose syntax error message fixes:
When %error-verbose or the obsolete `#define YYERROR_VERBOSE' is When %error-verbose or the obsolete "#define YYERROR_VERBOSE" is
specified, syntax error messages produced by the generated parser specified, syntax error messages produced by the generated parser
include the unexpected token as well as a list of expected tokens. include the unexpected token as well as a list of expected tokens.
The effect of %nonassoc on these verbose messages has been corrected The effect of %nonassoc on these verbose messages has been corrected
@@ -345,7 +340,7 @@ Bison News
in order to detect a syntax error. Because no unexpected token or in order to detect a syntax error. Because no unexpected token or
expected tokens can then be reported, the verbose syntax error expected tokens can then be reported, the verbose syntax error
message described above is suppressed, and the parser instead message described above is suppressed, and the parser instead
reports the simpler message, `syntax error'. Previously, this reports the simpler message, "syntax error". Previously, this
suppression was sometimes erroneously triggered by %nonassoc when a suppression was sometimes erroneously triggered by %nonassoc when a
lookahead was actually required. Now verbose messages are lookahead was actually required. Now verbose messages are
suppressed only when all previous lookaheads have already been suppressed only when all previous lookaheads have already been
@@ -381,7 +376,7 @@ Bison News
** -W/--warnings fixes: ** -W/--warnings fixes:
*** Bison now properly recognizes the `no-' versions of categories: *** Bison now properly recognizes the "no-" versions of categories:
For example, given the following command line, Bison now enables all For example, given the following command line, Bison now enables all
warnings except warnings for incompatibilities with POSIX Yacc: warnings except warnings for incompatibilities with POSIX Yacc:
@@ -392,7 +387,7 @@ Bison News
Previously, conflict reports were independent of Bison's normal Previously, conflict reports were independent of Bison's normal
warning system. Now, Bison recognizes the warning categories warning system. Now, Bison recognizes the warning categories
`conflicts-sr' and `conflicts-rr'. This change has important "conflicts-sr" and "conflicts-rr". This change has important
consequences for the -W and --warnings command-line options. For consequences for the -W and --warnings command-line options. For
example: example:
@@ -406,16 +401,16 @@ Bison News
expected number of conflicts is not reported, so -W and --warning expected number of conflicts is not reported, so -W and --warning
then have no effect on the conflict report. then have no effect on the conflict report.
*** The `none' category no longer disables a preceding `error': *** The "none" category no longer disables a preceding "error":
For example, for the following command line, Bison now reports For example, for the following command line, Bison now reports
errors instead of warnings for incompatibilities with POSIX Yacc: errors instead of warnings for incompatibilities with POSIX Yacc:
bison -Werror,none,yacc gram.y bison -Werror,none,yacc gram.y
*** The `none' category now disables all Bison warnings: *** The "none" category now disables all Bison warnings:
Previously, the `none' category disabled only Bison warnings for Previously, the "none" category disabled only Bison warnings for
which there existed a specific -W/--warning category. However, which there existed a specific -W/--warning category. However,
given the following command line, Bison is now guaranteed to given the following command line, Bison is now guaranteed to
suppress all warnings: suppress all warnings:
@@ -460,7 +455,7 @@ Bison News
errors should no longer cause M4 to report a broken pipe on the errors should no longer cause M4 to report a broken pipe on the
affected platforms. affected platforms.
** `%prec IDENTIFIER' requires IDENTIFIER to be defined separately. ** "%prec IDENTIFIER" requires IDENTIFIER to be defined separately.
POSIX specifies that an error be reported for any identifier that does POSIX specifies that an error be reported for any identifier that does
not appear on the LHS of a grammar rule and that is not defined by not appear on the LHS of a grammar rule and that is not defined by
@@ -515,7 +510,7 @@ Bison News
that YYFAIL will automatically invoke yyerror to report the syntax that YYFAIL will automatically invoke yyerror to report the syntax
error so that you don't have to. However, there are several other error so that you don't have to. However, there are several other
subtle differences between YYERROR and YYFAIL, and YYFAIL suffers from subtle differences between YYERROR and YYFAIL, and YYFAIL suffers from
inherent flaws when %error-verbose or `#define YYERROR_VERBOSE' is inherent flaws when %error-verbose or "#define YYERROR_VERBOSE" is
used. For a more detailed discussion, see: used. For a more detailed discussion, see:
http://lists.gnu.org/archive/html/bison-patches/2009-12/msg00024.html http://lists.gnu.org/archive/html/bison-patches/2009-12/msg00024.html
@@ -526,7 +521,7 @@ Bison News
Bison features compatible with it. Thus, during parser generation, Bison features compatible with it. Thus, during parser generation,
Bison 2.5 will produce a warning whenever it discovers YYFAIL in a Bison 2.5 will produce a warning whenever it discovers YYFAIL in a
rule action. In a later release, YYFAIL will be disabled for rule action. In a later release, YYFAIL will be disabled for
%error-verbose and `#define YYERROR_VERBOSE'. Eventually, YYFAIL will %error-verbose and "#define YYERROR_VERBOSE". Eventually, YYFAIL will
be removed altogether. be removed altogether.
There exists at least one case where Bison 2.5's YYFAIL warning will There exists at least one case where Bison 2.5's YYFAIL warning will
@@ -534,7 +529,7 @@ Bison News
Bison-defined macros for the sole purpose of suppressing C Bison-defined macros for the sole purpose of suppressing C
preprocessor warnings (from GCC cpp's -Wunused-macros, for example). preprocessor warnings (from GCC cpp's -Wunused-macros, for example).
To avoid Bison's future warning, such YYFAIL uses can be moved to the To avoid Bison's future warning, such YYFAIL uses can be moved to the
epilogue (that is, after the second `%%') in the Bison input file. In epilogue (that is, after the second "%%") in the Bison input file. In
this release (2.4.2), Bison already generates its own code to suppress this release (2.4.2), Bison already generates its own code to suppress
C preprocessor warnings for YYFAIL, so projects can remove their own C preprocessor warnings for YYFAIL, so projects can remove their own
phony uses of YYFAIL if compatibility with Bison releases prior to phony uses of YYFAIL if compatibility with Bison releases prior to
@@ -562,7 +557,7 @@ Bison News
exp: exp "+" exp { $$ = $1 + $3; }; exp: exp "+" exp { $$ = $1 + $3; };
Some grammars still depend on this `feature'. Bison 2.4.1 restores Some grammars still depend on this "feature". Bison 2.4.1 restores
the previous behavior in the case of C output (specifically, when the previous behavior in the case of C output (specifically, when
neither %language or %skeleton or equivalent command-line options neither %language or %skeleton or equivalent command-line options
are used) to leave more time for grammars depending on the old are used) to leave more time for grammars depending on the old
@@ -593,7 +588,7 @@ Bison News
%define NAME "VALUE" %define NAME "VALUE"
** The directive `%pure-parser' is now deprecated in favor of: ** The directive "%pure-parser" is now deprecated in favor of:
%define api.pure %define api.pure
@@ -603,15 +598,15 @@ Bison News
** Push Parsing ** Push Parsing
Bison can now generate an LALR(1) parser in C with a push interface. That Bison can now generate an LALR(1) parser in C with a push interface. That
is, instead of invoking `yyparse', which pulls tokens from `yylex', you can is, instead of invoking "yyparse", which pulls tokens from "yylex", you can
push one token at a time to the parser using `yypush_parse', which will push one token at a time to the parser using "yypush_parse", which will
return to the caller after processing each token. By default, the push return to the caller after processing each token. By default, the push
interface is disabled. Either of the following directives will enable it: interface is disabled. Either of the following directives will enable it:
%define api.push_pull "push" // Just push; does not require yylex. %define api.push_pull "push" // Just push; does not require yylex.
%define api.push_pull "both" // Push and pull; requires yylex. %define api.push_pull "both" // Push and pull; requires yylex.
See the new section `A Push Parser' in the Bison manual for details. See the new section "A Push Parser" in the Bison manual for details.
The current push parsing interface is experimental and may evolve. More user The current push parsing interface is experimental and may evolve. More user
feedback will help to stabilize it. feedback will help to stabilize it.
@@ -623,10 +618,10 @@ Bison News
** Java ** Java
Bison can now generate an LALR(1) parser in Java. The skeleton is Bison can now generate an LALR(1) parser in Java. The skeleton is
`data/lalr1.java'. Consider using the new %language directive instead of "data/lalr1.java". Consider using the new %language directive instead of
%skeleton to select it. %skeleton to select it.
See the new section `Java Parsers' in the Bison manual for details. See the new section "Java Parsers" in the Bison manual for details.
The current Java interface is experimental and may evolve. More user The current Java interface is experimental and may evolve. More user
feedback will help to stabilize it. feedback will help to stabilize it.
@@ -641,7 +636,7 @@ Bison News
** XML Automaton Report ** XML Automaton Report
Bison can now generate an XML report of the LALR(1) automaton using the new Bison can now generate an XML report of the LALR(1) automaton using the new
`--xml' option. The current XML schema is experimental and may evolve. More "--xml" option. The current XML schema is experimental and may evolve. More
user feedback will help to stabilize it. user feedback will help to stabilize it.
** The grammar file may now specify the name of the parser header file using ** The grammar file may now specify the name of the parser header file using
@@ -673,31 +668,31 @@ Bison News
%define lr.keep_unreachable_states %define lr.keep_unreachable_states
See the %define entry in the `Bison Declaration Summary' in the Bison manual See the %define entry in the "Bison Declaration Summary" in the Bison manual
for further discussion. for further discussion.
** Lookahead Set Correction in the `.output' Report ** Lookahead Set Correction in the ".output" Report
When instructed to generate a `.output' file including lookahead sets When instructed to generate a ".output" file including lookahead sets
(using `--report=lookahead', for example), Bison now prints each reduction's (using "--report=lookahead", for example), Bison now prints each reduction's
lookahead set only next to the associated state's one item that (1) is lookahead set only next to the associated state's one item that (1) is
associated with the same rule as the reduction and (2) has its dot at the end associated with the same rule as the reduction and (2) has its dot at the end
of its RHS. Previously, Bison also erroneously printed the lookahead set of its RHS. Previously, Bison also erroneously printed the lookahead set
next to all of the state's other items associated with the same rule. This next to all of the state's other items associated with the same rule. This
bug affected only the `.output' file and not the generated parser source bug affected only the ".output" file and not the generated parser source
code. code.
** --report-file=FILE is a new option to override the default `.output' file ** --report-file=FILE is a new option to override the default ".output" file
name. name.
** The `=' that used to be required in the following directives is now ** The "=" that used to be required in the following directives is now
deprecated: deprecated:
%file-prefix "parser" %file-prefix "parser"
%name-prefix "c_" %name-prefix "c_"
%output "parser.c" %output "parser.c"
** An Alternative to `%{...%}' -- `%code QUALIFIER {CODE}' ** An Alternative to "%{...%}" -- "%code QUALIFIER {CODE}"
Bison 2.3a provided a new set of directives as a more flexible alternative to Bison 2.3a provided a new set of directives as a more flexible alternative to
the traditional Yacc prologue blocks. Those have now been consolidated into the traditional Yacc prologue blocks. Those have now been consolidated into
@@ -705,14 +700,14 @@ Bison News
the purpose of the code and thus the location(s) where Bison should generate the purpose of the code and thus the location(s) where Bison should generate
it: it:
1. `%code {CODE}' replaces `%after-header {CODE}' 1. "%code {CODE}" replaces "%after-header {CODE}"
2. `%code requires {CODE}' replaces `%start-header {CODE}' 2. "%code requires {CODE}" replaces "%start-header {CODE}"
3. `%code provides {CODE}' replaces `%end-header {CODE}' 3. "%code provides {CODE}" replaces "%end-header {CODE}"
4. `%code top {CODE}' replaces `%before-header {CODE}' 4. "%code top {CODE}" replaces "%before-header {CODE}"
See the %code entries in section `Bison Declaration Summary' in the Bison See the %code entries in section "Bison Declaration Summary" in the Bison
manual for a summary of the new functionality. See the new section `Prologue manual for a summary of the new functionality. See the new section "Prologue
Alternatives' for a detailed discussion including the advantages of %code Alternatives" for a detailed discussion including the advantages of %code
over the traditional Yacc prologues. over the traditional Yacc prologues.
The prologue alternatives are experimental. More user feedback will help to The prologue alternatives are experimental. More user feedback will help to
@@ -735,24 +730,24 @@ Bison News
sometimes prove to be false alarms in existing grammars employing the Yacc sometimes prove to be false alarms in existing grammars employing the Yacc
constructs $0 or $-N (where N is some positive integer). constructs $0 or $-N (where N is some positive integer).
To enable these warnings, specify the option `--warnings=midrule-values' or To enable these warnings, specify the option "--warnings=midrule-values" or
`-W', which is a synonym for `--warnings=all'. "-W", which is a synonym for "--warnings=all".
** Default %destructor or %printer with `<*>' or `<>' ** Default %destructor or %printer with "<*>" or "<>"
Bison now recognizes two separate kinds of default %destructor's and Bison now recognizes two separate kinds of default %destructor's and
%printer's: %printer's:
1. Place `<*>' in a %destructor/%printer symbol list to define a default 1. Place "<*>" in a %destructor/%printer symbol list to define a default
%destructor/%printer for all grammar symbols for which you have formally %destructor/%printer for all grammar symbols for which you have formally
declared semantic type tags. declared semantic type tags.
2. Place `<>' in a %destructor/%printer symbol list to define a default 2. Place "<>" in a %destructor/%printer symbol list to define a default
%destructor/%printer for all grammar symbols without declared semantic %destructor/%printer for all grammar symbols without declared semantic
type tags. type tags.
Bison no longer supports the `%symbol-default' notation from Bison 2.3a. Bison no longer supports the "%symbol-default" notation from Bison 2.3a.
`<*>' and `<>' combined achieve the same effect with one exception: Bison no "<*>" and "<>" combined achieve the same effect with one exception: Bison no
longer applies any %destructor to a mid-rule value if that mid-rule value is longer applies any %destructor to a mid-rule value if that mid-rule value is
not actually ever referenced using either $$ or $n in a semantic action. not actually ever referenced using either $$ or $n in a semantic action.
@@ -760,11 +755,11 @@ Bison News
feedback will help to determine whether they should become permanent feedback will help to determine whether they should become permanent
features. features.
See the section `Freeing Discarded Symbols' in the Bison manual for further See the section "Freeing Discarded Symbols" in the Bison manual for further
details. details.
** %left, %right, and %nonassoc can now declare token numbers. This is required ** %left, %right, and %nonassoc can now declare token numbers. This is required
by POSIX. However, see the end of section `Operator Precedence' in the Bison by POSIX. However, see the end of section "Operator Precedence" in the Bison
manual for a caveat concerning the treatment of literal strings. manual for a caveat concerning the treatment of literal strings.
** The nonfunctional --no-parser, -n, and %no-parser options have been ** The nonfunctional --no-parser, -n, and %no-parser options have been
@@ -798,17 +793,17 @@ Bison News
%destructor { } <character> %destructor { } <character>
guarantees that, when the parser discards any user-defined symbol that has a guarantees that, when the parser discards any user-defined symbol that has a
semantic type tag other than `<character>', it passes its semantic value to semantic type tag other than "<character>", it passes its semantic value to
`free'. However, when the parser discards a `STRING1' or a `string1', it "free". However, when the parser discards a "STRING1" or a "string1", it
also prints its line number to `stdout'. It performs only the second also prints its line number to "stdout". It performs only the second
`%destructor' in this case, so it invokes `free' only once. "%destructor" in this case, so it invokes "free" only once.
[Although we failed to mention this here in the 2.3a release, the default [Although we failed to mention this here in the 2.3a release, the default
%destructor's and %printer's were experimental, and they were rewritten in %destructor's and %printer's were experimental, and they were rewritten in
future versions.] future versions.]
** Except for LALR(1) parsers in C with POSIX Yacc emulation enabled (with `-y', ** Except for LALR(1) parsers in C with POSIX Yacc emulation enabled (with "-y",
`--yacc', or `%yacc'), Bison no longer generates #define statements for "--yacc", or "%yacc"), Bison no longer generates #define statements for
associating token numbers with token names. Removing the #define statements associating token numbers with token names. Removing the #define statements
helps to sanitize the global namespace during preprocessing, but POSIX Yacc helps to sanitize the global namespace during preprocessing, but POSIX Yacc
requires them. Bison still generates an enum for token names in all cases. requires them. Bison still generates an enum for token names in all cases.
@@ -817,7 +812,7 @@ Bison News
potentially incompatible with previous releases of Bison. potentially incompatible with previous releases of Bison.
As before, you declare prologue blocks in your grammar file with the As before, you declare prologue blocks in your grammar file with the
`%{ ... %}' syntax. To generate the pre-prologue, Bison concatenates all "%{ ... %}" syntax. To generate the pre-prologue, Bison concatenates all
prologue blocks that you've declared before the first %union. To generate prologue blocks that you've declared before the first %union. To generate
the post-prologue, Bison concatenates all prologue blocks that you've the post-prologue, Bison concatenates all prologue blocks that you've
declared after the first %union. declared after the first %union.
@@ -846,7 +841,7 @@ Bison News
* the code file before the contents of the header file. It does *not* * the code file before the contents of the header file. It does *not*
* insert it into the header file. This is a good place to put * insert it into the header file. This is a good place to put
* #include's that you want at the top of your code file. A common * #include's that you want at the top of your code file. A common
* example is `#include "system.h"'. */ * example is '#include "system.h"'. */
} }
%start-header { %start-header {
/* Bison inserts this block into both the header file and the code file. /* Bison inserts this block into both the header file and the code file.
@@ -880,13 +875,13 @@ Bison News
[Although we failed to mention this here in the 2.3a release, the prologue [Although we failed to mention this here in the 2.3a release, the prologue
alternatives were experimental, and they were rewritten in future versions.] alternatives were experimental, and they were rewritten in future versions.]
** The option `--report=look-ahead' has been changed to `--report=lookahead'. ** The option "--report=look-ahead" has been changed to "--report=lookahead".
The old spelling still works, but is not documented and may be removed The old spelling still works, but is not documented and may be removed
in a future release. in a future release.
* Changes in version 2.3, 2006-06-05: * Changes in version 2.3, 2006-06-05:
** GLR grammars should now use `YYRECOVERING ()' instead of `YYRECOVERING', ** GLR grammars should now use "YYRECOVERING ()" instead of "YYRECOVERING",
for compatibility with LALR(1) grammars. for compatibility with LALR(1) grammars.
** It is now documented that any definition of YYSTYPE or YYLTYPE should ** It is now documented that any definition of YYSTYPE or YYLTYPE should
@@ -952,7 +947,7 @@ Bison News
The %parse-params are available in the destructors (and the The %parse-params are available in the destructors (and the
experimental printers) as per the documentation. experimental printers) as per the documentation.
** Bison now warns if it finds a stray `$' or `@' in an action. ** Bison now warns if it finds a stray "$" or "@" in an action.
** %require "VERSION" ** %require "VERSION"
This specifies that the grammar file depends on features implemented This specifies that the grammar file depends on features implemented
@@ -961,16 +956,16 @@ Bison News
** lalr1.cc: The token and value types are now class members. ** lalr1.cc: The token and value types are now class members.
The tokens were defined as free form enums and cpp macros. YYSTYPE The tokens were defined as free form enums and cpp macros. YYSTYPE
was defined as a free form union. They are now class members: was defined as a free form union. They are now class members:
tokens are enumerations of the `yy::parser::token' struct, and the tokens are enumerations of the "yy::parser::token" struct, and the
semantic values have the `yy::parser::semantic_type' type. semantic values have the "yy::parser::semantic_type" type.
If you do not want or can update to this scheme, the directive If you do not want or can update to this scheme, the directive
`%define "global_tokens_and_yystype" "1"' triggers the global '%define "global_tokens_and_yystype" "1"' triggers the global
definition of tokens and YYSTYPE. This change is suitable both definition of tokens and YYSTYPE. This change is suitable both
for previous releases of Bison, and this one. for previous releases of Bison, and this one.
If you wish to update, then make sure older version of Bison will If you wish to update, then make sure older version of Bison will
fail using `%require "2.2"'. fail using '%require "2.2"'.
** DJGPP support added. ** DJGPP support added.
@@ -1038,10 +1033,10 @@ Bison News
- A new directive "%expect-rr N" specifies the expected number of - A new directive "%expect-rr N" specifies the expected number of
reduce/reduce conflicts in GLR parsers. reduce/reduce conflicts in GLR parsers.
- %token numbers can now be hexadecimal integers, e.g., `%token FOO 0x12d'. - %token numbers can now be hexadecimal integers, e.g., "%token FOO 0x12d".
This is a GNU extension. This is a GNU extension.
- The option `--report=lookahead' was changed to `--report=look-ahead'. - The option "--report=lookahead" was changed to "--report=look-ahead".
[However, this was changed back after 2.3.] [However, this was changed back after 2.3.]
- Experimental %destructor support has been added to lalr1.cc. - Experimental %destructor support has been added to lalr1.cc.
@@ -1089,10 +1084,10 @@ Bison News
This reverts to the behavior of Bison 1.33 and earlier, and improves This reverts to the behavior of Bison 1.33 and earlier, and improves
compatibility with Yacc. compatibility with Yacc.
- `parse error' -> `syntax error' - "parse error" -> "syntax error"
Bison now uniformly uses the term `syntax error'; formerly, the code Bison now uniformly uses the term "syntax error"; formerly, the code
and manual sometimes used the term `parse error' instead. POSIX and manual sometimes used the term "parse error" instead. POSIX
requires `syntax error' in diagnostics, and it was thought better to requires "syntax error" in diagnostics, and it was thought better to
be consistent. be consistent.
- The documentation now emphasizes that yylex and yyerror must be - The documentation now emphasizes that yylex and yyerror must be
@@ -1105,7 +1100,7 @@ Bison News
output as "foo\\bar.y". output as "foo\\bar.y".
- Yacc command and library now available - Yacc command and library now available
The Bison distribution now installs a `yacc' command, as POSIX requires. The Bison distribution now installs a "yacc" command, as POSIX requires.
Also, Bison now installs a small library liby.a containing Also, Bison now installs a small library liby.a containing
implementations of Yacc-compatible yyerror and main functions. implementations of Yacc-compatible yyerror and main functions.
This library is normally not useful, but POSIX requires it. This library is normally not useful, but POSIX requires it.
@@ -1118,20 +1113,20 @@ Bison News
** Other compatibility issues ** Other compatibility issues
- %union directives can now have a tag before the `{', e.g., the - %union directives can now have a tag before the "{", e.g., the
directive `%union foo {...}' now generates the C code directive "%union foo {...}" now generates the C code
`typedef union foo { ... } YYSTYPE;'; this is for Yacc compatibility. "typedef union foo { ... } YYSTYPE;"; this is for Yacc compatibility.
The default union tag is `YYSTYPE', for compatibility with Solaris 9 Yacc. The default union tag is "YYSTYPE", for compatibility with Solaris 9 Yacc.
For consistency, YYLTYPE's struct tag is now `YYLTYPE' not `yyltype'. For consistency, YYLTYPE's struct tag is now "YYLTYPE" not "yyltype".
This is for compatibility with both Yacc and Bison 1.35. This is for compatibility with both Yacc and Bison 1.35.
- `;' is output before the terminating `}' of an action, for - ";" is output before the terminating "}" of an action, for
compatibility with Bison 1.35. compatibility with Bison 1.35.
- Bison now uses a Yacc-style format for conflict reports, e.g., - Bison now uses a Yacc-style format for conflict reports, e.g.,
`conflicts: 2 shift/reduce, 1 reduce/reduce'. "conflicts: 2 shift/reduce, 1 reduce/reduce".
- `yystype' and `yyltype' are now obsolescent macros instead of being - "yystype" and "yyltype" are now obsolescent macros instead of being
typedefs or tags; they are no longer documented and are planned to be typedefs or tags; they are no longer documented and are planned to be
withdrawn in a future release. withdrawn in a future release.
@@ -1139,13 +1134,13 @@ Bison News
- GLR and inline - GLR and inline
Users of Bison have to decide how they handle the portability of the Users of Bison have to decide how they handle the portability of the
C keyword `inline'. C keyword "inline".
- `parsing stack overflow...' -> `parser stack overflow' - "parsing stack overflow..." -> "parser stack overflow"
GLR parsers now report `parser stack overflow' as per the Bison manual. GLR parsers now report "parser stack overflow" as per the Bison manual.
** Bison now warns if it detects conflicting outputs to the same file, ** Bison now warns if it detects conflicting outputs to the same file,
e.g., it generates a warning for `bison -d -o foo.h foo.y' since e.g., it generates a warning for "bison -d -o foo.h foo.y" since
that command outputs both code and header to foo.h. that command outputs both code and header to foo.h.
** #line in output files ** #line in output files
@@ -1202,8 +1197,8 @@ Bison News
** Output Directory ** Output Directory
When not in Yacc compatibility mode, when the output file was not When not in Yacc compatibility mode, when the output file was not
specified, running `bison foo/bar.y' created `foo/bar.c'. It specified, running "bison foo/bar.y" created "foo/bar.c". It
now creates `bar.c'. now creates "bar.c".
** Undefined token ** Undefined token
The undefined token was systematically mapped to 2 which prevented The undefined token was systematically mapped to 2 which prevented
@@ -1220,11 +1215,11 @@ Bison News
will be mapped onto another number. will be mapped onto another number.
** Verbose error messages ** Verbose error messages
They no longer report `..., expecting error or...' for states where They no longer report "..., expecting error or..." for states where
error recovery is possible. error recovery is possible.
** End token ** End token
Defaults to `$end' instead of `$'. Defaults to "$end" instead of "$".
** Error recovery now conforms to documentation and to POSIX ** Error recovery now conforms to documentation and to POSIX
When a Bison-generated parser encounters a syntax error, it now pops When a Bison-generated parser encounters a syntax error, it now pops
@@ -1261,7 +1256,7 @@ Bison News
Rules that can never be reduced because of conflicts are now Rules that can never be reduced because of conflicts are now
reported. reported.
** Incorrect `Token not used' ** Incorrect "Token not used"
On a grammar such as On a grammar such as
%token useless useful %token useless useful
@@ -1269,7 +1264,7 @@ Bison News
exp: '0' %prec useful; exp: '0' %prec useful;
where a token was used to set the precedence of the last rule, where a token was used to set the precedence of the last rule,
bison reported both `useful' and `useless' as useless tokens. bison reported both "useful" and "useless" as useless tokens.
** Revert the C++ namespace changes introduced in 1.31 ** Revert the C++ namespace changes introduced in 1.31
as they caused too many portability hassles. as they caused too many portability hassles.
@@ -1283,7 +1278,7 @@ Bison News
** Token end-of-file ** Token end-of-file
The token end of file may be specified by the user, in which case, The token end of file may be specified by the user, in which case,
the user symbol is used in the reports, the graphs, and the verbose the user symbol is used in the reports, the graphs, and the verbose
error messages instead of `$end', which remains being the default. error messages instead of "$end", which remains being the default.
For instance For instance
%token MYEOF 0 %token MYEOF 0
or or
@@ -1297,7 +1292,10 @@ Bison News
Croatian, thanks to Denis Lackovic. Croatian, thanks to Denis Lackovic.
** Incorrect token definitions ** Incorrect token definitions
When given `%token 'a' "A"', Bison used to output `#define 'a' 65'. When given
%token 'a' "A"
bison used to output
#define 'a' 65
** Token definitions as enums ** Token definitions as enums
Tokens are output both as the traditional #define's, and, provided Tokens are output both as the traditional #define's, and, provided
@@ -1309,7 +1307,7 @@ Bison News
produces additional information: produces additional information:
- itemset - itemset
complete the core item sets with their closure complete the core item sets with their closure
- lookahead [changed to `look-ahead' in 1.875e through 2.3, but changed back] - lookahead [changed to "look-ahead" in 1.875e through 2.3, but changed back]
explicitly associate lookahead tokens to items explicitly associate lookahead tokens to items
- solved - solved
describe shift/reduce conflicts solving. describe shift/reduce conflicts solving.
@@ -1347,9 +1345,9 @@ Bison News
** File name clashes are detected ** File name clashes are detected
$ bison foo.y -d -o foo.x $ bison foo.y -d -o foo.x
fatal error: header and parser would both be named `foo.x' fatal error: header and parser would both be named "foo.x"
** A missing `;' at the end of a rule triggers a warning ** A missing ";" at the end of a rule triggers a warning
In accordance with POSIX, and in agreement with other In accordance with POSIX, and in agreement with other
Yacc implementations, Bison will mandate this semicolon in the near Yacc implementations, Bison will mandate this semicolon in the near
future. This eases the implementation of a Bison parser of Bison future. This eases the implementation of a Bison parser of Bison
@@ -1388,7 +1386,7 @@ Bison News
GNU Gettext asserts 10 s/r conflicts, but there are 7. Now that GNU Gettext asserts 10 s/r conflicts, but there are 7. Now that
Bison dies on incorrect %expectations, we fear there will be Bison dies on incorrect %expectations, we fear there will be
too many bug reports for Gettext, so _for the time being_, %expect too many bug reports for Gettext, so _for the time being_, %expect
does not trigger an error when the input file is named `plural.y'. does not trigger an error when the input file is named "plural.y".
** Use of alloca in parsers ** Use of alloca in parsers
If YYSTACK_USE_ALLOCA is defined to 0, then the parsers will use If YYSTACK_USE_ALLOCA is defined to 0, then the parsers will use
@@ -1465,15 +1463,15 @@ Bison News
New. New.
** --output ** --output
New, aliasing `--output-file'. New, aliasing "--output-file".
* Changes in version 1.30, 2001-10-26: * Changes in version 1.30, 2001-10-26:
** `--defines' and `--graph' have now an optional argument which is the ** "--defines" and "--graph" have now an optional argument which is the
output file name. `-d' and `-g' do not change; they do not take any output file name. "-d" and "-g" do not change; they do not take any
argument. argument.
** `%source_extension' and `%header_extension' are removed, failed ** "%source_extension" and "%header_extension" are removed, failed
experiment. experiment.
** Portability fixes. ** Portability fixes.
@@ -1483,9 +1481,9 @@ Bison News
** The output file does not define const, as this caused problems when used ** The output file does not define const, as this caused problems when used
with common autoconfiguration schemes. If you still use ancient compilers with common autoconfiguration schemes. If you still use ancient compilers
that lack const, compile with the equivalent of the C compiler option that lack const, compile with the equivalent of the C compiler option
`-Dconst='. Autoconf's AC_C_CONST macro provides one way to do this. "-Dconst=". Autoconf's AC_C_CONST macro provides one way to do this.
** Added `-g' and `--graph'. ** Added "-g" and "--graph".
** The Bison manual is now distributed under the terms of the GNU FDL. ** The Bison manual is now distributed under the terms of the GNU FDL.
@@ -1497,18 +1495,18 @@ Bison News
** Added the old Bison reference card. ** Added the old Bison reference card.
** Added `--locations' and `%locations'. ** Added "--locations" and "%locations".
** Added `-S' and `--skeleton'. ** Added "-S" and "--skeleton".
** `%raw', `-r', `--raw' is disabled. ** "%raw", "-r", "--raw" is disabled.
** Special characters are escaped when output. This solves the problems ** Special characters are escaped when output. This solves the problems
of the #line lines with path names including backslashes. of the #line lines with path names including backslashes.
** New directives. ** New directives.
`%yacc', `%fixed_output_files', `%defines', `%no_parser', `%verbose', "%yacc", "%fixed_output_files", "%defines", "%no_parser", "%verbose",
`%debug', `%source_extension' and `%header_extension'. "%debug", "%source_extension" and "%header_extension".
** @$ ** @$
Automatic location tracking. Automatic location tracking.
@@ -1625,4 +1623,5 @@ along with this program. If not, see <http://www.gnu.org/licenses/>.
Local Variables: Local Variables:
mode: outline mode: outline
fill-column: 76
End: End: