Danny Robson
f6056153e3
This places, at long last, the core library code into the same namespace as the extended library code.
128 lines
4.1 KiB
C++
128 lines
4.1 KiB
C++
/*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*
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* Copyright 2018 Danny Robson <danny@nerdcruft.net>
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*/
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#ifndef CRUFT_UTIL_CPP_HPP
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#define CRUFT_UTIL_CPP_HPP
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#include "string.hpp"
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#include "view.hpp"
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#include <experimental/filesystem>
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#include <string>
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#include <map>
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#include <stdexcept>
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#include <stack>
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namespace cruft::cpp {
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///////////////////////////////////////////////////////////////////////////
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struct context {
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std::stack<std::experimental::filesystem::path> source;
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std::map<std::string,std::string> defines;
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};
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///////////////////////////////////////////////////////////////////////////
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/// an abstract base that performs processing for a directive
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class directive {
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public:
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virtual ~directive () = default;
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/// handles a preprocessor directive by:
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/// * perform some processing on any number of input lines,
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/// * optionally writes to the supplied stream,
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/// * and returns the line that should be consumed next
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///
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/// \param lines is a tokenised view over all the lines of the input
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/// \return the next line that processing should continue from
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virtual cruft::tokeniser<const char*>::iterator
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process (std::ostream&,
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context&,
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cruft::view<cruft::tokeniser<const char*>::iterator> lines) const = 0;
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};
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///////////////////////////////////////////////////////////////////////////
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class processor {
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public:
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processor ();
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void add (std::string token, std::unique_ptr<directive>);
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void process (std::ostream&, const std::experimental::filesystem::path&) const;
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std::experimental::filesystem::path
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resolve (const std::experimental::filesystem::path&) const;
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cruft::tokeniser<const char*>::iterator
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process (std::ostream&,
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context&,
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cruft::view<cruft::tokeniser<const char*>::iterator>) const;
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private:
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std::map<std::string, std::unique_ptr<directive>> m_directives;
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};
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///////////////////////////////////////////////////////////////////////////
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/// thrown when a processor encounters a directive it has not been
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/// configured to handle
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class unknown_directive : public std::runtime_error {
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using runtime_error::runtime_error;
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};
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///////////////////////////////////////////////////////////////////////////
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/// silently ignores configured directive by advancing the input cursor
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/// past the provided line without writing to the output stream.
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class ignore : public directive {
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cruft::tokeniser<const char*>::iterator
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process (std::ostream&,
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context&,
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cruft::view<cruft::tokeniser<const char*>::iterator> lines) const override
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{ return lines.begin ()++; }
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};
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///------------------------------------------------------------------------
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/// copies the supplied directive to the output stream without any
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/// modification
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class passthrough : public directive {
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public:
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passthrough (const std::string &name);
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virtual cruft::tokeniser<const char*>::iterator
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process (std::ostream&,
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context&,
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cruft::view<cruft::tokeniser<const char*>::iterator>) const override;
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private:
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const std::string m_name;
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};
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///------------------------------------------------------------------------
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/// handles include directives by copying the contents of the referenced
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/// path into the input stream
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class include : public directive {
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public:
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include (processor &_parent);
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void add (const std::experimental::filesystem::path&);
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virtual cruft::tokeniser<const char*>::iterator
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process (std::ostream&,
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context&,
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cruft::view<cruft::tokeniser<const char*>::iterator>) const override;
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private:
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processor &m_parent;
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std::vector<std::experimental::filesystem::path> m_paths;
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};
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};
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#endif
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