Mercurial > hg > octave-lojdl
changeset 14333:6dd710b73150
maint: add yet another file omitted from earlier commit
author | John W. Eaton <jwe@octave.org> |
---|---|
date | Sun, 05 Feb 2012 15:41:42 -0500 |
parents | affda9a8f7d0 |
children | ce2b59a6d0e5 |
files | src/parse-private.h |
diffstat | 1 files changed, 96 insertions(+), 0 deletions(-) [+] |
line wrap: on
line diff
new file mode 100644 --- /dev/null +++ b/src/parse-private.h @@ -0,0 +1,96 @@ +/* + +Copyright (C) 2012 John W. Eaton + +This file is part of Octave. + +Octave is free software; you can redistribute it and/or modify it +under the terms of the GNU General Public License as published by the +Free Software Foundation; either version 3 of the License, or (at your +option) any later version. + +Octave is distributed in the hope that it will be useful, but WITHOUT +ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or +FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License +for more details. + +You should have received a copy of the GNU General Public License +along with Octave; see the file COPYING. If not, see +<http://www.gnu.org/licenses/>. + +*/ + +#if !defined (octave_parse_private_h) +#define octave_parse_private_h 1 + +#include <stack> + +#include "symtab.h" + +// Keep track of symbol table information when parsing functions. +class symtab_context +{ +private: + + class frame + { + public: + frame (symbol_table::scope_id s, symbol_table::scope_id c) + : m_scope (s), m_context (c) { } + + frame (const frame& f) : m_scope (f.m_scope), m_context (f.m_context) { } + + frame& operator = (const frame& f) + { + if (&f != this) + { + m_scope = f.m_scope; + m_context = f.m_context; + } + + return *this; + } + + ~frame (void) { } + + symbol_table::scope_id scope (void) const { return m_scope; } + symbol_table::scope_id context (void) const { return m_context; } + + private: + + symbol_table::scope_id m_scope; + symbol_table::scope_id m_context; + }; + + std::stack<frame> frame_stack; + +public: + symtab_context (void) : frame_stack () { } + + void clear (void) + { + while (! frame_stack.empty ()) + frame_stack.pop (); + } + + bool empty (void) const { return frame_stack.empty (); } + + void pop (void) + { + frame tmp = frame_stack.top (); + + symbol_table::set_scope_and_context (tmp.scope (), tmp.context ()); + + frame_stack.pop (); + } + + void push (void) + { + frame_stack.push (frame (symbol_table::current_scope (), + symbol_table::current_context ())); + } +}; + +extern symtab_context parser_symtab_context; + +#endif