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297 lines
8.7 KiB
C++
297 lines
8.7 KiB
C++
/*=============================================================================
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Boost.Wave: A Standard compliant C++ preprocessor library
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Whitespace eater
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http://www.boost.org/
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Copyright (c) 2003 Paul Mensonides
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Copyright (c) 2001-2012 Hartmut Kaiser.
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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=============================================================================*/
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#if !defined(WHITESPACE_HANDLING_HPP_INCLUDED)
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#define WHITESPACE_HANDLING_HPP_INCLUDED
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#include <boost/wave/wave_config.hpp>
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#include <boost/wave/token_ids.hpp>
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#include <boost/wave/preprocessing_hooks.hpp>
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#include <boost/wave/language_support.hpp>
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// this must occur after all of the includes and before any code appears
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#ifdef BOOST_HAS_ABI_HEADERS
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#include BOOST_ABI_PREFIX
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#endif
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///////////////////////////////////////////////////////////////////////////////
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namespace boost {
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namespace wave {
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namespace context_policies {
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namespace util {
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///////////////////////////////////////////////////////////////////////////
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// This function returns true if the given C style comment contains at
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// least one newline
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template <typename TokenT>
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bool ccomment_has_newline(TokenT const& token)
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{
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using namespace boost::wave;
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if (T_CCOMMENT == token_id(token) &&
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TokenT::string_type::npos != token.get_value().find_first_of("\n"))
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{
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return true;
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}
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return false;
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}
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///////////////////////////////////////////////////////////////////////////
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// This function returns the number of newlines in the given C style
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// comment
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template <typename TokenT>
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int ccomment_count_newlines(TokenT const& token)
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{
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using namespace boost::wave;
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int newlines = 0;
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if (T_CCOMMENT == token_id(token)) {
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typename TokenT::string_type const& value = token.get_value();
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typename TokenT::string_type::size_type p = value.find_first_of("\n");
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while (TokenT::string_type::npos != p) {
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++newlines;
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p = value.find_first_of("\n", p+1);
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}
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}
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return newlines;
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}
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#if BOOST_WAVE_SUPPORT_CPP0X != 0
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///////////////////////////////////////////////////////////////////////////
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// This function returns the number of newlines in the given C++11 style
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// raw string
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template <typename TokenT>
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int rawstring_count_newlines(TokenT const& token)
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{
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using namespace boost::wave;
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int newlines = 0;
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if (T_RAWSTRINGLIT == token_id(token)) {
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typename TokenT::string_type const& value = token.get_value();
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typename TokenT::string_type::size_type p = value.find_first_of("\n");
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while (TokenT::string_type::npos != p) {
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++newlines;
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p = value.find_first_of("\n", p+1);
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}
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}
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return newlines;
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}
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#endif
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}
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///////////////////////////////////////////////////////////////////////////////
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template <typename TokenT>
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class eat_whitespace
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: public default_preprocessing_hooks
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{
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public:
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eat_whitespace();
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template <typename ContextT>
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bool may_skip_whitespace(ContextT const& ctx, TokenT &token,
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bool &skipped_newline);
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template <typename ContextT>
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bool may_skip_whitespace(ContextT const& ctx, TokenT &token,
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bool preserve_comments_, bool preserve_bol_whitespace_,
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bool &skipped_newline);
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protected:
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bool skip_cppcomment(boost::wave::token_id id)
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{
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return !preserve_comments && T_CPPCOMMENT == id;
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}
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private:
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typedef bool state_t(TokenT &token, bool &skipped_newline);
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state_t eat_whitespace::* state;
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state_t general, newline, newline_2nd, whitespace, bol_whitespace;
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bool preserve_comments;
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bool preserve_bol_whitespace;
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};
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template <typename TokenT>
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inline
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eat_whitespace<TokenT>::eat_whitespace()
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: state(&eat_whitespace::newline), preserve_comments(false),
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preserve_bol_whitespace(false)
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{
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}
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template <typename TokenT>
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template <typename ContextT>
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inline bool
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eat_whitespace<TokenT>::may_skip_whitespace(ContextT const& ctx, TokenT &token,
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bool &skipped_newline)
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{
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// re-initialize the preserve comments state
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preserve_comments = boost::wave::need_preserve_comments(ctx.get_language());
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return (this->*state)(token, skipped_newline);
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}
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template <typename TokenT>
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template <typename ContextT>
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inline bool
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eat_whitespace<TokenT>::may_skip_whitespace(ContextT const& ctx, TokenT &token,
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bool preserve_comments_, bool preserve_bol_whitespace_,
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bool &skipped_newline)
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{
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// re-initialize the preserve comments state
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preserve_comments = preserve_comments_;
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preserve_bol_whitespace = preserve_bol_whitespace_;
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return (this->*state)(token, skipped_newline);
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}
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template <typename TokenT>
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inline bool
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eat_whitespace<TokenT>::general(TokenT &token, bool &skipped_newline)
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{
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using namespace boost::wave;
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token_id id = token_id(token);
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if (T_NEWLINE == id || T_CPPCOMMENT == id) {
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state = &eat_whitespace::newline;
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}
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else if (T_SPACE == id || T_SPACE2 == id || T_CCOMMENT == id) {
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state = &eat_whitespace::whitespace;
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if (util::ccomment_has_newline(token))
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skipped_newline = true;
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if ((!preserve_comments || T_CCOMMENT != id) &&
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token.get_value().size() > 1)
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{
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token.set_value(" "); // replace with a single space
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}
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}
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else {
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state = &eat_whitespace::general;
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}
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return false;
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}
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template <typename TokenT>
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inline bool
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eat_whitespace<TokenT>::newline(TokenT &token, bool &skipped_newline)
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{
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using namespace boost::wave;
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token_id id = token_id(token);
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if (T_NEWLINE == id || T_CPPCOMMENT == id) {
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skipped_newline = true;
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state = &eat_whitespace::newline_2nd;
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return T_NEWLINE == id || skip_cppcomment(id);
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}
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if (T_SPACE != id && T_SPACE2 != id && T_CCOMMENT != id)
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return general(token, skipped_newline);
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if (T_CCOMMENT == id) {
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if (util::ccomment_has_newline(token)) {
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skipped_newline = true;
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state = &eat_whitespace::newline_2nd;
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}
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if (preserve_comments) {
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state = &eat_whitespace::general;
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return false;
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}
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return true;
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}
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if (preserve_bol_whitespace) {
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state = &eat_whitespace::bol_whitespace;
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return false;
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}
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return true;
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}
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template <typename TokenT>
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inline bool
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eat_whitespace<TokenT>::newline_2nd(TokenT &token, bool &skipped_newline)
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{
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using namespace boost::wave;
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token_id id = token_id(token);
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if (T_SPACE == id || T_SPACE2 == id) {
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if (preserve_bol_whitespace) {
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state = &eat_whitespace::bol_whitespace;
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return false;
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}
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return true;
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}
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if (T_CCOMMENT == id) {
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if (util::ccomment_has_newline(token))
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skipped_newline = true;
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if (preserve_comments) {
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state = &eat_whitespace::general;
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return false;
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}
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return true;
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}
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if (T_NEWLINE != id && T_CPPCOMMENT != id)
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return general(token, skipped_newline);
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skipped_newline = true;
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return T_NEWLINE == id || skip_cppcomment(id);
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}
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template <typename TokenT>
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inline bool
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eat_whitespace<TokenT>::bol_whitespace(TokenT &token, bool &skipped_newline)
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{
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using namespace boost::wave;
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token_id id = token_id(token);
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if (T_SPACE == id || T_SPACE2 == id)
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return !preserve_bol_whitespace;
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return general(token, skipped_newline);
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}
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template <typename TokenT>
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inline bool
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eat_whitespace<TokenT>::whitespace(TokenT &token, bool &skipped_newline)
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{
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using namespace boost::wave;
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token_id id = token_id(token);
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if (T_SPACE != id && T_SPACE2 != id &&
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T_CCOMMENT != id && T_CPPCOMMENT != id)
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{
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return general(token, skipped_newline);
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}
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if (T_CCOMMENT == id) {
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if (util::ccomment_has_newline(token))
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skipped_newline = true;
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return !preserve_comments;
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}
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return T_SPACE == id || T_SPACE2 == id || skip_cppcomment(id);
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}
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///////////////////////////////////////////////////////////////////////////////
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} // namespace context_policies
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} // namespace wave
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} // namespace boost
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// the suffix header occurs after all of the code
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#ifdef BOOST_HAS_ABI_HEADERS
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#include BOOST_ABI_SUFFIX
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#endif
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#endif // !defined(WHITESPACE_HANDLING_HPP_INCLUDED)
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