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99 lines
3.5 KiB
C++
99 lines
3.5 KiB
C++
#include "Preprocessor.hpp"
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#include <boost/wave.hpp>
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#include <boost/wave/cpplexer/cpp_lex_token.hpp>
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#include <boost/wave/cpplexer/cpp_lex_iterator.hpp>
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namespace sh
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{
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std::string Preprocessor::preprocess (std::string source, const std::string& includePath, std::vector<std::string> definitions, const std::string& name)
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{
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std::stringstream returnString;
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// current file position is saved for exception handling
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boost::wave::util::file_position_type current_position;
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try
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{
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// This token type is one of the central types used throughout the library.
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// It is a template parameter to some of the public classes and instances
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// of this type are returned from the iterators.
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typedef boost::wave::cpplexer::lex_token<> token_type;
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// The template boost::wave::cpplexer::lex_iterator<> is the lexer type to
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// to use as the token source for the preprocessing engine. It is
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// parametrized with the token type.
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typedef boost::wave::cpplexer::lex_iterator<token_type> lex_iterator_type;
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// This is the resulting context type. The first template parameter should
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// match the iterator type used during construction of the context
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// instance (see below). It is the type of the underlying input stream.
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typedef boost::wave::context<std::string::iterator, lex_iterator_type
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, boost::wave::iteration_context_policies::load_file_to_string,
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emit_custom_line_directives_hooks>
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context_type;
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// The preprocessor iterator shouldn't be constructed directly. It is
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// generated through a wave::context<> object. This wave:context<> object
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// is additionally used to initialize and define different parameters of
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// the actual preprocessing.
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//
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// The preprocessing of the input stream is done on the fly behind the
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// scenes during iteration over the range of context_type::iterator_type
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// instances.
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context_type ctx (source.begin(), source.end(), name.c_str());
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ctx.add_include_path(includePath.c_str());
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for (std::vector<std::string>::iterator it = definitions.begin(); it != definitions.end(); ++it)
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{
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ctx.add_macro_definition(*it);
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}
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// Get the preprocessor iterators and use them to generate the token
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// sequence.
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context_type::iterator_type first = ctx.begin();
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context_type::iterator_type last = ctx.end();
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// The input stream is preprocessed for you while iterating over the range
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// [first, last). The dereferenced iterator returns tokens holding
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// information about the preprocessed input stream, such as token type,
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// token value, and position.
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while (first != last)
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{
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current_position = (*first).get_position();
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returnString << (*first).get_value();
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++first;
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}
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}
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catch (boost::wave::cpp_exception const& e)
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{
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// some preprocessing error
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std::stringstream error;
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error
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<< e.file_name() << "(" << e.line_no() << "): "
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<< e.description();
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throw std::runtime_error(error.str());
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}
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catch (std::exception const& e)
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{
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// use last recognized token to retrieve the error position
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std::stringstream error;
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error
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<< current_position.get_file()
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<< "(" << current_position.get_line() << "): "
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<< "exception caught: " << e.what();
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throw std::runtime_error(error.str());
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}
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catch (...)
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{
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// use last recognized token to retrieve the error position
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std::stringstream error;
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error
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<< current_position.get_file()
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<< "(" << current_position.get_line() << "): "
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<< "unexpected exception caught.";
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throw std::runtime_error(error.str());
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}
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return returnString.str();
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}
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}
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