comparison DEPENDENCIES/generic/include/boost/wave/whitespace_handling.hpp @ 16:2665513ce2d3

Add boost headers

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