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* bootstrap (gnulib_modules): Add strverscmp.

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* lib/.cvsignore: Add strverscmp.c, strverscmp.h.
* m4/.cvsignore: Add strverscmp.m4.
* src/parse-gram.y (%require): New token, new rule.
(version_check): New.
* src/scan-gram.l (%require): Adjust.
* tests/input.at (AT_REQUIRE): New.
Use it.
* doc/bison.texinfo (Require Decl): New.
(Calc++ Parser): Use %require.
This commit is contained in:
Akim Demaille
2005-10-02 18:49:15 +00:00
parent 21667f64cd
commit b50d2359d7
11 changed files with 491 additions and 380 deletions
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48
doc/bison.texinfo
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@@ -145,9 +145,9 @@ The Concepts of Bison
Writing @acronym{GLR} Parsers
* Simple GLR Parsers:: Using @acronym{GLR} parsers on unambiguous grammars
* Merging GLR Parses:: Using @acronym{GLR} parsers to resolve ambiguities
* Compiler Requirements:: @acronym{GLR} parsers require a modern C compiler
* Simple GLR Parsers:: Using @acronym{GLR} parsers on unambiguous grammars
* Merging GLR Parses:: Using @acronym{GLR} parsers to resolve ambiguities
* Compiler Requirements:: @acronym{GLR} parsers require a modern C compiler
Examples
@@ -225,6 +225,7 @@ Tracking Locations
Bison Declarations
* Require Decl:: Requiring a Bison version.
* Token Decl:: Declaring terminal symbols.
* Precedence Decl:: Declaring terminals with precedence and associativity.
* Union Decl:: Declaring the set of all semantic value types.
@@ -732,9 +733,9 @@ user-defined function on the resulting values to produce an arbitrary
merged result.
@menu
* Simple GLR Parsers:: Using @acronym{GLR} parsers on unambiguous grammars
* Merging GLR Parses:: Using @acronym{GLR} parsers to resolve ambiguities
* Compiler Requirements:: @acronym{GLR} parsers require a modern C compiler
* Simple GLR Parsers:: Using @acronym{GLR} parsers on unambiguous grammars
* Merging GLR Parses:: Using @acronym{GLR} parsers to resolve ambiguities
* Compiler Requirements:: @acronym{GLR} parsers require a modern C compiler
@end menu
@node Simple GLR Parsers
@@ -3548,6 +3549,7 @@ it explicitly (@pxref{Language and Grammar, ,Languages and Context-Free
Grammars}).
@menu
* Require Decl:: Requiring a Bison version.
* Token Decl:: Declaring terminal symbols.
* Precedence Decl:: Declaring terminals with precedence and associativity.
* Union Decl:: Declaring the set of all semantic value types.
@@ -3560,6 +3562,19 @@ Grammars}).
* Decl Summary:: Table of all Bison declarations.
@end menu
@node Require Decl
@subsection Require a Version of Bison
@cindex version requirement
@cindex requiring a version of Bison
@findex %require
You may require the minimum version of Bison to process the grammar. If
the requirement is not met, @command{bison} exits with an error.
@example
%require "@var{version}"
@end example
@node Token Decl
@subsection Token Type Names
@cindex declaring token type names
@@ -4157,6 +4172,12 @@ Request a pure (reentrant) parser program (@pxref{Pure Decl, ,A Pure
(Reentrant) Parser}).
@end deffn
@deffn {Directive} %require "@var{version}"
Specify that version @var{version} or higher of Bison required for the
grammar.
@xref{Require Decl, , Require a Version of Bison}.
@end deffn
@deffn {Directive} %token-table
Generate an array of token names in the parser file. The name of the
array is @code{yytname}; @code{yytname[@var{i}]} is the name of the
@@ -7275,13 +7296,16 @@ calcxx_driver::error (const std::string& m)
@node Calc++ Parser
@subsection Calc++ Parser
The parser definition file @file{calc++-parser.yy} starts by asking
for the C++ LALR(1) skeleton, the creation of the parser header file, and
specifies the name of the parser class.
The parser definition file @file{calc++-parser.yy} starts by asking for
the C++ LALR(1) skeleton, the creation of the parser header file, and
specifies the name of the parser class. Because the C++ skeleton
changed several times, it is safer to require the version you designed
the grammar for.
@comment file: calc++-parser.yy
@example
%skeleton "lalr1.cc" /* -*- C++ -*- */
%require "2.1a"
%defines
%define "parser_class_name" "calcxx_parser"
@end example
@@ -7968,6 +7992,12 @@ Bison declaration to request a pure (reentrant) parser.
@xref{Pure Decl, ,A Pure (Reentrant) Parser}.
@end deffn
@deffn {Directive} %require "@var{version}"
Specify that version @var{version} or higher of Bison required for the
grammar.
@xref{Require Decl, , Require a Version of Bison}.
@end deffn
@deffn {Directive} %right
Bison declaration to assign right associativity to token(s).
@xref{Precedence Decl, ,Operator Precedence}.