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https://git.savannah.gnu.org/git/bison.git
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1c7ec959b1
Work on some other areas of Bison revealed that some macros expanded to be expanded only once were actually expanded several times. This was due to the fact that changecom was not properly restored each time, and macro names appearing in comments were then expanded. Introduce begin/end macros which are easier to match that changecom()/changecom(#). * data/bison.m4 (b4_output_begin, b4_output_end): New. * data/glr.c, data/glr.cc, data/lalr1.cc, data/lalr1.java, * data/location.cc, data/stack.hh, data/yacc.c: Use them.
122 lines
2.5 KiB
C++
122 lines
2.5 KiB
C++
# C++ skeleton for Bison
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# Copyright (C) 2002-2012 Free Software Foundation, Inc.
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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m4_pushdef([b4_copyright_years],
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[2002-2012])
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b4_output_begin([b4_dir_prefix[]stack.hh])
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b4_copyright([Stack handling for Bison parsers in C++],
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[2002-2012])[
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/**
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** \file ]b4_dir_prefix[stack.hh
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** Define the ]b4_namespace_ref[::stack class.
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*/
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]b4_cpp_guard_open([b4_dir_prefix[]stack.hh])[
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# include <deque>
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]b4_namespace_open[
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template <class T, class S = std::deque<T> >
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class stack
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{
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public:
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// Hide our reversed order.
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typedef typename S::reverse_iterator iterator;
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typedef typename S::const_reverse_iterator const_iterator;
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stack () : seq_ ()
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{
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}
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stack (unsigned int n) : seq_ (n)
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{
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}
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inline
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T&
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operator [] (unsigned int i)
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{
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return seq_[i];
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}
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inline
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const T&
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operator [] (unsigned int i) const
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{
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return seq_[i];
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}
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inline
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void
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push (const T& t)
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{
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seq_.push_front (t);
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}
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inline
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void
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pop (unsigned int n = 1)
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{
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for (; n; --n)
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seq_.pop_front ();
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}
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inline
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unsigned int
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height () const
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{
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return seq_.size ();
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}
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inline const_iterator begin () const { return seq_.rbegin (); }
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inline const_iterator end () const { return seq_.rend (); }
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private:
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S seq_;
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};
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/// Present a slice of the top of a stack.
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template <class T, class S = stack<T> >
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class slice
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{
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public:
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slice (const S& stack, unsigned int range)
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: stack_ (stack)
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, range_ (range)
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{
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}
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inline
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const T&
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operator [] (unsigned int i) const
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{
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return stack_[range_ - i];
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}
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private:
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const S& stack_;
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unsigned int range_;
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};
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]b4_namespace_close[
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]b4_cpp_guard_close([b4_dir_prefix[]stack.hh])
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b4_output_end()
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m4_popdef([b4_copyright_years])
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