Ichthyostega
8ffab2f002
Mostly, std::regexp can be used as a drop-in replacement. Note: unfortunately ECMA regexps do not support lookbehind assertions. This lookbehind is necesary here because we want to allow parsing values from strings with additional content, which means we need explicitly to exclude mismatches due to invalid syntax. We can work around that issue like "either line start, or *not* one of these characters. Alternatively we could consider to make the match more rigid, i.e we would require the string to conain *only* the timecode spec to be parsed.
124 lines
3.7 KiB
C++
124 lines
3.7 KiB
C++
/*
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SEARCHPATH.hpp - helpers for searching directory lists and locating modules
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Copyright (C) Lumiera.org
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2011, Hermann Vosseler <Ichthyostega@web.de>
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of
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the License, or (at your option) any later version.
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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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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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/** @file searchpath.hpp
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** Helpers to handle directory search paths.
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** The SerachPathSplitter allows to evaluate a "path" like specification
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** with colon separated components. It is complemented by some magic convenience
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** functions to self-discover the currently running executable and to resolve
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** the `$ORIGIN` pattern similar to what is known from linker `rpath` / `runpath`
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*/
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#ifndef COMMON_SEARCHPATH_H
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#define COMMON_SEARCHPATH_H
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#include "lib/error.hpp"
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#include "lib/nocopy.hpp"
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#include <boost/filesystem.hpp>
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#include <string>
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#include <regex>
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namespace lib {
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using std::string;
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using SubMatch = std::smatch::value_type const&;
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namespace error = lumiera::error;
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namespace fsys = boost::filesystem;
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LUMIERA_ERROR_DECLARE (FILE_NOT_DIRECTORY); ///< path element points at a file instead of a directory
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using error::LERR_(ITER_EXHAUST);
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/** retrieve the location of the executable */
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string findExePath();
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/** replace $ORIGIN tokens in the given string
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* @return copy with expansions applied */
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string replaceMagicLinkerTokens (string const& src);
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/**
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* Helper: Access a path Specification as a sequence of filesystem Paths.
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* This iterator class dissects a ':'-separated path list. The individual
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* components may use the symbol \c $ORIGIN to refer to the directory
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* holding the current executable.
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* @note #next picks the current component and advances the iteration.
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*/
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class SearchPathSplitter
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: util::NonCopyable
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{
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string pathSpec_;
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std::sregex_iterator pos_,
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end_;
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static const std::regex EXTRACT_PATHSPEC;
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public:
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SearchPathSplitter (string const& searchPath)
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: pathSpec_(replaceMagicLinkerTokens (searchPath))
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, pos_(pathSpec_.begin(),pathSpec_.end(), EXTRACT_PATHSPEC)
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, end_()
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{ }
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explicit operator bool() const { return isValid(); }
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bool
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isValid() const
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{
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return pos_ != end_;
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}
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string
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next ()
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{
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if (!isValid())
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throw error::Logic ("Search path exhausted."
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,LERR_(ITER_EXHAUST));
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string currentPathElement = pos_->str();
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++pos_;
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return currentPathElement;
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}
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};
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/** helper to establish the location to search for loadable modules,
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* configuration files, icons and further resources. After first trying
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* the moduleName directly, the given search path is walked using the
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* SearchPathSplitter, until encountering an existing file with the
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* given name.
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* @return the absolute pathname of the module file found
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* @throws error::Config when the resolution fails
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*/
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string resolveModulePath (fsys::path moduleName, string searchPath = "");
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} // namespace lib
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#endif
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