* Glossary:: Basic concepts are explained.
* Copying This Manual:: License for copying this manual.
* Bibliography:: Publications cited in this manual.
-* Index:: Cross-references to the text.
+* Index of Terms:: Cross-references to the text.
@detailmenu
--- The Detailed Node Listing ---
Debugging Your Parser
* Understanding:: Understanding the structure of your parser.
+* Graphviz:: Getting a visual representation of the parser.
* Tracing:: Tracing the execution of your parser.
Tracing Your Parser
* C++ position:: One point in the source file
* C++ location:: Two points in the source file
+* User Defined Location Type:: Required interface for locations
A Complete C++ Example
@deffn {Directive} %initial-action @{ @var{code} @}
@findex %initial-action
Declare that the braced @var{code} must be invoked before parsing each time
-@code{yyparse} is called. The @var{code} may use @code{$$} and
-@code{@@$} --- initial value and location of the lookahead --- and the
-@code{%parse-param}.
+@code{yyparse} is called. The @var{code} may use @code{$$} (or
+@code{$<@var{tag}>$}) and @code{@@$} --- initial value and location of the
+lookahead --- and the @code{%parse-param}.
@end deffn
For instance, if your locations use a file name, you may use
@deffn {Directive} %destructor @{ @var{code} @} @var{symbols}
@findex %destructor
Invoke the braced @var{code} whenever the parser discards one of the
-@var{symbols}.
-Within @var{code}, @code{$$} designates the semantic value associated
-with the discarded symbol, and @code{@@$} designates its location.
-The additional parser parameters are also available (@pxref{Parser Function, ,
-The Parser Function @code{yyparse}}).
+@var{symbols}. Within @var{code}, @code{$$} (or @code{$<@var{tag}>$})
+designates the semantic value associated with the discarded symbol, and
+@code{@@$} designates its location. The additional parser parameters are
+also available (@pxref{Parser Function, , The Parser Function
+@code{yyparse}}).
When a symbol is listed among @var{symbols}, its @code{%destructor} is called a
per-symbol @code{%destructor}.
the current lookahead and the entire stack (except the current
right-hand side symbols) when the parser returns immediately, and
@item
+the current lookahead and the entire stack (including the current right-hand
+side symbols) when the C++ parser (@file{lalr1.cc}) catches an exception in
+@code{parse},
+@item
the start symbol, when the parser succeeds.
@end itemize
@c This is the same text as for %destructor.
Invoke the braced @var{code} whenever the parser displays one of the
@var{symbols}. Within @var{code}, @code{yyoutput} denotes the output stream
-(a @code{FILE*} in C, and an @code{std::ostream&} in C++),
-@code{$$} designates the semantic value associated with the symbol, and
-@code{@@$} its location. The additional parser parameters are also
-available (@pxref{Parser Function, , The Parser Function @code{yyparse}}).
+(a @code{FILE*} in C, and an @code{std::ostream&} in C++), @code{$$} (or
+@code{$<@var{tag}>$}) designates the semantic value associated with the
+symbol, and @code{@@$} its location. The additional parser parameters are
+also available (@pxref{Parser Function, , The Parser Function
+@code{yyparse}}).
The @var{symbols} are defined as for @code{%destructor} (@pxref{Destructor
Decl, , Freeing Discarded Symbols}.): they can be per-type (e.g.,
@end deffn
@deffn {Directive} %debug
-Instrument the output parser for traces. Obsoleted by @samp{%define
+Instrument the parser for traces. Obsoleted by @samp{%define
parse.trace}.
@xref{Tracing, ,Tracing Your Parser}.
@end deffn
If you have declared @code{%code requires} or @code{%code provides}, the output
header also contains their code.
@xref{%code Summary}.
+
+@cindex Header guard
+The generated header is protected against multiple inclusions with a C
+preprocessor guard: @samp{YY_@var{PREFIX}_@var{FILE}_INCLUDED}, where
+@var{PREFIX} and @var{FILE} are the prefix (@pxref{Multiple Parsers,
+,Multiple Parsers in the Same Program}) and generated file name turned
+uppercase, with each series of non alphanumerical characters converted to a
+single underscore.
+
+For instance with @samp{%define api.prefix "calc"} and @samp{%defines
+"lib/parse.h"}, the header will be guarded as follows.
+@example
+#ifndef YY_CALC_LIB_PARSE_H_INCLUDED
+# define YY_CALC_LIB_PARSE_H_INCLUDED
+...
+#endif /* ! YY_CALC_LIB_PARSE_H_INCLUDED */
+@end example
@end deffn
@deffn {Directive} %defines @var{defines-file}
@end itemize
@c namespace
+@c ================================================== api.location.type
+@item @code{api.location.type}
+@findex %define api.location.type
+
+@itemize @bullet
+@item Language(s): C++, Java
+
+@item Purpose: Define the location type.
+@xref{User Defined Location Type}.
+
+@item Accepted Values: String
+
+@item Default Value: none
+
+@item History: introduced in Bison 2.7
+@end itemize
@c ================================================== api.prefix
@item api.prefix
@itemize @bullet
@item Language(s): All
-@item Purpose: Rename exported symbols
+@item Purpose: Rename exported symbols.
@xref{Multiple Parsers, ,Multiple Parsers in the Same Program}.
@item Accepted Values: String
@item Default Value: @code{yy}
+
+@item History: introduced in Bison 2.6
@end itemize
@c ================================================== api.pure
-@c ================================================== api.tokens.prefix
-@item api.tokens.prefix
-@findex %define api.tokens.prefix
+@c ================================================== api.token.prefix
+@item api.token.prefix
+@findex %define api.token.prefix
@itemize
@item Languages(s): all
@example
%token FILE for ERROR
-%define api.tokens.prefix "TOK_"
+%define api.token.prefix "TOK_"
%%
start: FILE for ERROR;
@end example
@item Default Value:
empty
+@item History:
+introduced in Bison 2.8
@end itemize
-@c api.tokens.prefix
+@c api.token.prefix
@c ================================================== lex_symbol
@c lex_symbol
-@c ================================================== lr.default-reductions
+@c ================================================== lr.default-reduction
-@item lr.default-reductions
-@findex %define lr.default-reductions
+@item lr.default-reduction
+@findex %define lr.default-reduction
@itemize @bullet
@item Language(s): all
@item @code{accepting} if @code{lr.type} is @code{canonical-lr}.
@item @code{most} otherwise.
@end itemize
+@item History:
+introduced as @code{lr.default-reduction} in 2.5, renamed as
+@code{lr.default-reduction} in 2.8.
@end itemize
-@c ============================================ lr.keep-unreachable-states
+@c ============================================ lr.keep-unreachable-state
-@item lr.keep-unreachable-states
-@findex %define lr.keep-unreachable-states
+@item lr.keep-unreachable-state
+@findex %define lr.keep-unreachable-state
@itemize @bullet
@item Language(s): all
@item Accepted Values: Boolean
@item Default Value: @code{false}
@end itemize
-@c lr.keep-unreachable-states
+introduced as @code{lr.keep_unreachable_states} in 2.3b, renamed as
+@code{lr.keep-unreachable-state} in 2.5, and as
+@code{lr.keep-unreachable-state} in 2.8.
+@c lr.keep-unreachable-state
@c ================================================== lr.type
@findex %define parse.trace
@itemize
-@item Languages(s): C, C++
+@item Languages(s): C, C++, Java
@item Purpose: Require parser instrumentation for tracing.
-In C/C++, define the macro @code{YYDEBUG} to 1 in the parser implementation
+@xref{Tracing, ,Tracing Your Parser}.
+
+In C/C++, define the macro @code{YYDEBUG} (or @code{@var{prefix}DEBUG} with
+@samp{%define api.prefix @var{prefix}}), see @ref{Multiple Parsers,
+,Multiple Parsers in the Same Program}) to 1 in the parser implementation
file if it is not already defined, so that the debugging facilities are
-compiled. @xref{Tracing, ,Tracing Your Parser}.
+compiled.
@item Accepted Values: Boolean
exported in the generated header.
The easy way to do this is to define the @code{%define} variable
-@code{api.prefix} (possibly using the option
-@samp{-Dapi.prefix=@var{prefix}}, see @ref{Invocation, ,Invoking Bison}).
-This renames the interface functions and variables of the Bison parser to
-start with @var{prefix} instead of @samp{yy}, and all the macros to start by
-@var{PREFIX} (i.e., @var{prefix} upper cased) instead of @samp{YY}. You can
-use this to give each parser distinct names that do not conflict.
+@code{api.prefix}. With different @code{api.prefix}s it is guaranteed that
+headers do not conflict when included together, and that compiled objects
+can be linked together too. Specifying @samp{%define api.prefix
+@var{prefix}} (or passing the option @samp{-Dapi.prefix=@var{prefix}}, see
+@ref{Invocation, ,Invoking Bison}) renames the interface functions and
+variables of the Bison parser to start with @var{prefix} instead of
+@samp{yy}, and all the macros to start by @var{PREFIX} (i.e., @var{prefix}
+upper-cased) instead of @samp{YY}.
The renamed symbols include @code{yyparse}, @code{yylex}, @code{yyerror},
@code{yynerrs}, @code{yylval}, @code{yylloc}, @code{yychar} and
@code{yydebug}. If you use a push parser, @code{yypush_parse},
@code{yypull_parse}, @code{yypstate}, @code{yypstate_new} and
@code{yypstate_delete} will also be renamed. The renamed macros include
-@code{YYSTYPE}, @code{YYSTYPE_IS_TRIVIAL}, @code{YYSTYPE_IS_DECLARED},
-@code{YYLTYPE}, @code{YYLTYPE_IS_TRIVIAL}, and @code{YYLTYPE_IS_DECLARED}.
+@code{YYSTYPE}, @code{YYLTYPE}, and @code{YYDEBUG}, which is treated
+specifically --- more about this below.
For example, if you use @samp{%define api.prefix c}, the names become
@code{cparse}, @code{clex}, @dots{}, @code{CSTYPE}, @code{CLTYPE}, and so
int cparse (void);
@end example
-Previously, a similar feature was provided by the obsoleted directive
-@code{%name-prefix} (@pxref{Table of Symbols, ,Bison Symbols}) and option
-@code{--name-prefix} (@pxref{Bison Options}).
+The macro @code{YYDEBUG} is commonly used to enable the tracing support in
+parsers. To comply with this tradition, when @code{api.prefix} is used,
+@code{YYDEBUG} (not renamed) is used as a default value:
+
+@example
+/* Enabling traces. */
+#ifndef CDEBUG
+# if defined YYDEBUG
+# if YYDEBUG
+# define CDEBUG 1
+# else
+# define CDEBUG 0
+# endif
+# else
+# define CDEBUG 0
+# endif
+#endif
+#if CDEBUG
+extern int cdebug;
+#endif
+@end example
+
+@sp 2
+
+Prior to Bison 2.6, a feature similar to @code{api.prefix} was provided by
+the obsolete directive @code{%name-prefix} (@pxref{Table of Symbols, ,Bison
+Symbols}) and the option @code{--name-prefix} (@pxref{Bison Options}).
@node Interface
@chapter Parser C-Language Interface
@xref{Push Decl, ,A Push Parser}.
@deftypefun int yypush_parse (yypstate *yyps)
-The value returned by @code{yypush_parse} is the same as for yyparse with the
-following exception. @code{yypush_parse} will return YYPUSH_MORE if more input
-is required to finish parsing the grammar.
+The value returned by @code{yypush_parse} is the same as for yyparse with
+the following exception: it returns @code{YYPUSH_MORE} if more input is
+required to finish parsing the grammar.
@end deftypefun
@node Pull Parser Function
@node Default Reductions
@subsection Default Reductions
@cindex default reductions
-@findex %define lr.default-reductions
+@findex %define lr.default-reduction
@findex %nonassoc
After parser table construction, Bison identifies the reduction with the
split the parse instead.
To adjust which states have default reductions enabled, use the
-@code{%define lr.default-reductions} directive.
+@code{%define lr.default-reduction} directive.
-@deffn {Directive} {%define lr.default-reductions @var{WHERE}}
+@deffn {Directive} {%define lr.default-reduction @var{WHERE}}
Specify the kind of states that are permitted to contain default reductions.
The accepted values of @var{WHERE} are:
@itemize
@node Unreachable States
@subsection Unreachable States
-@findex %define lr.keep-unreachable-states
+@findex %define lr.keep-unreachable-state
@cindex unreachable states
If there exists no sequence of transitions from the parser's start state to
keeping unreachable states is sometimes useful when trying to understand the
relationship between the parser and the grammar.
-@deffn {Directive} {%define lr.keep-unreachable-states @var{VALUE}}
+@deffn {Directive} {%define lr.keep-unreachable-state @var{VALUE}}
Request that Bison allow unreachable states to remain in the parser tables.
@var{VALUE} must be a Boolean. The default is @code{false}.
@end deffn
@menu
* Understanding:: Understanding the structure of your parser.
+* Graphviz:: Getting a visual representation of the parser.
* Tracing:: Tracing the execution of your parser.
@end menu
@samp{*}, but also because the
associativity of @samp{/} is not specified.
+@c ================================================= Graphical Representation
+
+@node Graphviz
+@section Visualizing Your Parser
+@cindex dot
+
+As another means to gain better understanding of the shift/reduce
+automaton corresponding to the Bison parser, a DOT file can be generated. Note
+that debugging a real grammar with this is tedious at best, and impractical
+most of the times, because the generated files are huge (the generation of
+a PDF or PNG file from it will take very long, and more often than not it will
+fail due to memory exhaustion). This option was rather designed for beginners,
+to help them understand LR parsers.
+
+This file is generated when the @option{--graph} option is specified (see
+@pxref{Invocation, , Invoking Bison}). Its name is made by removing
+@samp{.tab.c} or @samp{.c} from the parser implementation file name, and
+adding @samp{.dot} instead. If the grammar file is @file{foo.y}, the
+Graphviz output file is called @file{foo.dot}.
+
+The following grammar file, @file{rr.y}, will be used in the sequel:
+
+@example
+%%
+@group
+exp: a ";" | b ".";
+a: "0";
+b: "0";
+@end group
+@end example
+
+The graphical output is very similar to the textual one, and as such it is
+easier understood by making direct comparisons between them. See
+@ref{Debugging, , Debugging Your Parser} for a detailled analysis of the
+textual report.
+
+@subheading Graphical Representation of States
+
+The items (pointed rules) for each state are grouped together in graph nodes.
+Their numbering is the same as in the verbose file. See the following points,
+about transitions, for examples
+
+When invoked with @option{--report=lookaheads}, the lookahead tokens, when
+needed, are shown next to the relevant rule between square brackets as a
+comma separated list. This is the case in the figure for the representation of
+reductions, below.
+
+@sp 1
+
+The transitions are represented as directed edges between the current and
+the target states.
+
+@subheading Graphical Representation of Shifts
+
+Shifts are shown as solid arrows, labelled with the lookahead token for that
+shift. The following describes a reduction in the @file{rr.output} file:
+
+@example
+@group
+state 3
+
+ 1 exp: a . ";"
+
+ ";" shift, and go to state 6
+@end group
+@end example
+
+A Graphviz rendering of this portion of the graph could be:
+
+@center @image{figs/example-shift, 100pt}
+
+@subheading Graphical Representation of Reductions
+
+Reductions are shown as solid arrows, leading to a diamond-shaped node
+bearing the number of the reduction rule. The arrow is labelled with the
+appropriate comma separated lookahead tokens. If the reduction is the default
+action for the given state, there is no such label.
+
+This is how reductions are represented in the verbose file @file{rr.output}:
+@example
+state 1
+
+ 3 a: "0" . [";"]
+ 4 b: "0" . ["."]
+
+ "." reduce using rule 4 (b)
+ $default reduce using rule 3 (a)
+@end example
+
+A Graphviz rendering of this portion of the graph could be:
+
+@center @image{figs/example-reduce, 120pt}
+
+When unresolved conflicts are present, because in deterministic parsing
+a single decision can be made, Bison can arbitrarily choose to disable a
+reduction, see @ref{Shift/Reduce, , Shift/Reduce Conflicts}. Discarded actions
+are distinguished by a red filling color on these nodes, just like how they are
+reported between square brackets in the verbose file.
+
+The reduction corresponding to the rule number 0 is the acceptation state. It
+is shown as a blue diamond, labelled "Acc".
+
+@subheading Graphical representation of go tos
+
+The @samp{go to} jump transitions are represented as dotted lines bearing
+the name of the rule being jumped to.
+
+@c ================================================= Tracing
@node Tracing
@section Tracing Your Parser
YYDEBUG 1} in the prologue of the grammar file (@pxref{Prologue, , The
Prologue}).
-@item the option @option{-t}, @option{--debug}
-Use the @samp{-t} option when you run Bison (@pxref{Invocation,
-,Invoking Bison}). This is POSIX compliant too.
+If the @code{%define} variable @code{api.prefix} is used (@pxref{Multiple
+Parsers, ,Multiple Parsers in the Same Program}), for instance @samp{%define
+api.prefix x}, then if @code{CDEBUG} is defined, its value controls the
+tracing feature (enabled if and only if nonzero); otherwise tracing is
+enabled if and only if @code{YYDEBUG} is nonzero.
+
+@item the option @option{-t} (POSIX Yacc compliant)
+@itemx the option @option{--debug} (Bison extension)
+Use the @samp{-t} option when you run Bison (@pxref{Invocation, ,Invoking
+Bison}). With @samp{%define api.prefix c}, it defines @code{CDEBUG} to 1,
+otherwise it defines @code{YYDEBUG} to 1.
@item the directive @samp{%debug}
@findex %debug
conflicts is not reported, so @option{-W} and @option{--warning} then have
no effect on the conflict report.
+@item deprecated
+Deprecated constructs whose support will be removed in future versions of
+Bison.
+
@item other
All warnings not categorized above. These warnings are enabled by default.
@item none
Turn off all the warnings.
@item error
-Treat warnings as errors.
+See @option{-Werror}, below.
@end table
A category can be turned off by prefixing its name with @samp{no-}. For
instance, @option{-Wno-yacc} will hide the warnings about
POSIX Yacc incompatibilities.
+
+@item -Werror[=@var{category}]
+@itemx -Wno-error[=@var{category}]
+Enable warnings falling in @var{category}, and treat them as errors. If no
+@var{category} is given, it defaults to making all enabled warnings into errors.
+
+@var{category} is the same as for @option{--warnings}, with the exception that
+it may not be prefixed with @samp{no-} (see above).
+
+Prefixed with @samp{no}, it deactivates the error treatment for this
+@var{category}. However, the warning itself won't be disabled, or enabled, by
+this option.
+
+Note that the precedence of the @samp{=} and @samp{,} operators is such that
+the following commands are @emph{not} equivalent, as the first will not treat
+S/R conflicts as errors.
+
+@example
+$ bison -Werror=yacc,conflicts-sr input.y
+$ bison -Werror=yacc,error=conflicts-sr input.y
+@end example
@end table
@noindent
Description of the grammar, conflicts (resolved and unresolved), and
parser's automaton.
+@item itemset
+Implies @code{state} and augments the description of the automaton with
+the full set of items for each state, instead of its core only.
+
@item lookahead
Implies @code{state} and augments the description of the automaton with
each rule's lookahead set.
-@item itemset
-Implies @code{state} and augments the description of the automaton with
-the full set of items for each state, instead of its core only.
+@item solved
+Implies @code{state}. Explain how conflicts were solved thanks to
+precedence and associativity directives.
+
+@item all
+Enable all the items.
+
+@item none
+Do not generate the report.
@end table
@item --report-file=@var{file}
@table @file
@item position.hh
@itemx location.hh
-The definition of the classes @code{position} and @code{location},
-used for location tracking when enabled. @xref{C++ Location Values}.
+The definition of the classes @code{position} and @code{location}, used for
+location tracking when enabled. These files are not generated if the
+@code{%define} variable @code{api.location.type} is defined. @xref{C++
+Location Values}.
@item stack.hh
An auxiliary class @code{stack} used by the parser.
@c - %define filename_type "const symbol::Symbol"
When the directive @code{%locations} is used, the C++ parser supports
-location tracking, see @ref{Tracking Locations}. Two auxiliary classes
-define a @code{position}, a single point in a file, and a @code{location}, a
-range composed of a pair of @code{position}s (possibly spanning several
-files).
+location tracking, see @ref{Tracking Locations}.
+
+By default, two auxiliary classes define a @code{position}, a single point
+in a file, and a @code{location}, a range composed of a pair of
+@code{position}s (possibly spanning several files). But if the
+@code{%define} variable @code{api.location.type} is defined, then these
+classes will not be generated, and the user defined type will be used.
@tindex uint
In this section @code{uint} is an abbreviation for @code{unsigned int}: in
@menu
* C++ position:: One point in the source file
* C++ location:: Two points in the source file
+* User Defined Location Type:: Required interface for locations
@end menu
@node C++ position
@code{filename} defined, or equal filename/line or column.
@end deftypefun
+@node User Defined Location Type
+@subsubsection User Defined Location Type
+@findex %define api.location.type
+
+Instead of using the built-in types you may use the @code{%define} variable
+@code{api.location.type} to specify your own type:
+
+@example
+%define api.location.type @var{LocationType}
+@end example
+
+The requirements over your @var{LocationType} are:
+@itemize
+@item
+it must be copyable;
+
+@item
+in order to compute the (default) value of @code{@@$} in a reduction, the
+parser basically runs
+@example
+@@$.begin = @@$1.begin;
+@@$.end = @@$@var{N}.end; // The location of last right-hand side symbol.
+@end example
+@noindent
+so there must be copyable @code{begin} and @code{end} members;
+
+@item
+alternatively you may redefine the computation of the default location, in
+which case these members are not required (@pxref{Location Default Action});
+
+@item
+if traces are enabled, then there must exist an @samp{std::ostream&
+ operator<< (std::ostream& o, const @var{LocationType}& s)} function.
+@end itemize
+
+@sp 1
+
+In programs with several C++ parsers, you may also use the @code{%define}
+variable @code{api.location.type} to share a common set of built-in
+definitions for @code{position} and @code{location}. For instance, one
+parser @file{master/parser.yy} might use:
+
+@example
+%defines
+%locations
+%define namespace "master::"
+@end example
+
+@noindent
+to generate the @file{master/position.hh} and @file{master/location.hh}
+files, reused by other parsers as follows:
+
+@example
+%define api.location.type "master::location"
+%code requires @{ #include <master/location.hh> @}
+@end example
+
@node C++ Parser Interface
@subsection C++ Parser Interface
@c - define parser_class_name
@deftypemethod {parser} {int} parse ()
Run the syntactic analysis, and return 0 on success, 1 otherwise.
+
+@cindex exceptions
+The whole function is wrapped in a @code{try}/@code{catch} block, so that
+when an exception is thrown, the @code{%destructor}s are called to release
+the lookahead symbol, and the symbols pushed on the stack.
@end deftypemethod
@deftypemethod {parser} {std::ostream&} debug_stream ()
@deftypemethod {symbol_type} {} make_@var{token} (const @var{value_type}& @var{value}, const location_type& @var{location})
@deftypemethodx {symbol_type} {} make_@var{token} (const location_type& @var{location})
Build a complete terminal symbol for the token type @var{token} (not
-including the @code{api.tokens.prefix}) whose possible semantic value is
+including the @code{api.token.prefix}) whose possible semantic value is
@var{value} of adequate @var{value_type}. If location tracking is enabled,
also pass the @var{location}.
@end deftypemethod
For instance, given the following declarations:
@example
-%define api.tokens.prefix "TOK_"
+%define api.token.prefix "TOK_"
%token <std::string> IDENTIFIER;
%token <int> INTEGER;
%token COLON;
allows for nicer error messages referring to ``end of file'' instead of
``$end''. Similarly user friendly names are provided for each symbol. To
avoid name clashes in the generated files (@pxref{Calc++ Scanner}), prefix
-tokens with @code{TOK_} (@pxref{%define Summary,,api.tokens.prefix}).
+tokens with @code{TOK_} (@pxref{%define Summary,,api.token.prefix}).
@comment file: calc++-parser.yy
@example
-%define api.tokens.prefix "TOK_"
+%define api.token.prefix "TOK_"
%token
END 0 "end of file"
ASSIGN ":="
No @code{%destructor} is needed to enable memory deallocation during error
recovery; the memory, for strings for instance, will be reclaimed by the
regular destructors. All the values are printed using their
-@code{operator<<}.
+@code{operator<<} (@pxref{Printer Decl, , Printing Semantic Values}).
-@c FIXME: Document %printer, and mention that it takes a braced-code operand.
@comment file: calc++-parser.yy
@example
%printer @{ yyoutput << $$; @} <*>;
defines a class representing a @dfn{location}, a range composed of a pair of
positions (possibly spanning several files). The location class is an inner
class of the parser; the name is @code{Location} by default, and may also be
-renamed using @samp{%define location_type "@var{class-name}"}.
+renamed using @code{%define api.location.type "@var{class-name}"}.
The location class treats the position as a completely opaque value.
By default, the class name is @code{Position}, but this can be changed
-with @samp{%define position_type "@var{class-name}"}. This class must
+with @code{%define api.position.type "@var{class-name}"}. This class must
be supplied by the user.
@deftypemethod {Lexer} {void} yyerror (Location @var{loc}, String @var{msg})
This method is defined by the user to emit an error message. The first
parameter is omitted if location tracking is not active. Its type can be
-changed using @samp{%define location_type "@var{class-name}".}
+changed using @code{%define api.location.type "@var{class-name}".}
@end deftypemethod
@deftypemethod {Lexer} {int} yylex ()
@code{yylex} returned, and the first position beyond it. These
methods are not needed unless location tracking is active.
-The return type can be changed using @samp{%define position_type
+The return type can be changed using @code{%define api.position.type
"@var{class-name}".}
@end deftypemethod
@xref{Java Scanner Interface}.
@end deffn
-@deffn {Directive} {%define location_type} "@var{class}"
+@deffn {Directive} {%define api.location.type} "@var{class}"
The name of the class used for locations (a range between two
positions). This class is generated as an inner class of the parser
class by @command{bison}. Default is @code{Location}.
+Formerly named @code{location_type}.
@xref{Java Location Values}.
@end deffn
@xref{Java Bison Interface}.
@end deffn
-@deffn {Directive} {%define position_type} "@var{class}"
+@deffn {Directive} {%define api.position.type} "@var{class}"
The name of the class used for positions. This class must be supplied by
the user. Default is @code{Position}.
+Formerly named @code{position_type}.
@xref{Java Location Values}.
@end deffn
More user feedback will help to stabilize it.)
@end deffn
-@deffn {Macro} YYPARSE_PARAM
-An obsolete macro for specifying the name of a parameter that
-@code{yyparse} should accept. The use of this macro is deprecated, and
-is supported only for Yacc like parsers. @xref{Pure Calling,, Calling
-Conventions for Pure Parsers}.
-@end deffn
-
@deffn {Macro} YYRECOVERING
The expression @code{YYRECOVERING ()} yields 1 when the parser
is recovering from a syntax error, and 0 otherwise.
@uref{http://www.cs.rhul.ac.uk/research/languages/publications/tomita_style_1.ps}
@end table
-@node Index
-@unnumbered Index
+@node Index of Terms
+@unnumbered Index of Terms
@printindex cp
@c LocalWords: toString deftypeivar deftypeivarx deftypeop YYParser strictfp
@c LocalWords: superclasses boolean getErrorVerbose setErrorVerbose deftypecv
@c LocalWords: getDebugStream setDebugStream getDebugLevel setDebugLevel url
-@c LocalWords: bisonVersion deftypecvx bisonSkeleton getStartPos getEndPos
+@c LocalWords: bisonVersion deftypecvx bisonSkeleton getStartPos getEndPos uint
@c LocalWords: getLVal defvar deftypefn deftypefnx gotos msgfmt Corbett LALR's
-@c LocalWords: subdirectory Solaris nonassociativity perror schemas Malloy
-@c LocalWords: Scannerless ispell american
+@c LocalWords: subdirectory Solaris nonassociativity perror schemas Malloy ints
+@c LocalWords: Scannerless ispell american ChangeLog smallexample CSTYPE CLTYPE
+@c LocalWords: clval CDEBUG cdebug deftypeopx yyterminate LocationType
+@c LocalWords: errorVerbose
@c Local Variables:
@c ispell-dictionary: "american"
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