boost/spirit/home/lex/lexer/lexertl/generate_static.hpp
// Copyright (c) 2008-2009 Ben Hanson
// Copyright (c) 2008-2011 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(BOOST_SPIRIT_LEX_LEXERTL_GENERATE_CPP_FEB_10_2008_0855PM)
#define BOOST_SPIRIT_LEX_LEXERTL_GENERATE_CPP_FEB_10_2008_0855PM
#if defined(_MSC_VER)
#pragma once
#endif
#include <boost/spirit/home/support/detail/lexer/char_traits.hpp>
#include <boost/spirit/home/support/detail/lexer/consts.hpp>
#include <boost/spirit/home/support/detail/lexer/rules.hpp>
#include <boost/spirit/home/support/detail/lexer/size_t.hpp>
#include <boost/spirit/home/support/detail/lexer/state_machine.hpp>
#include <boost/spirit/home/support/detail/lexer/debug.hpp>
#include <boost/spirit/home/lex/lexer/lexertl/static_version.hpp>
#include <boost/scoped_array.hpp>
#include <cstring>
#include <locale>
///////////////////////////////////////////////////////////////////////////////
namespace boost { namespace spirit { namespace lex { namespace lexertl
{
namespace detail
{
///////////////////////////////////////////////////////////////////////////
template <typename CharT>
struct string_lit;
template <>
struct string_lit<char>
{
static char get(char c) { return c; }
static std::string get(char const* str = "") { return str; }
};
template <>
struct string_lit<wchar_t>
{
static wchar_t get(char c)
{
typedef std::ctype<wchar_t> ctype_t;
return std::use_facet<ctype_t>(std::locale()).widen(c);
}
static std::basic_string<wchar_t> get(char const* source = "")
{
using namespace std; // some systems have size_t in ns std
size_t len = strlen(source);
boost::scoped_array<wchar_t> result (new wchar_t[len+1]);
result.get()[len] = '\0';
// working with wide character streams is supported only if the
// platform provides the std::ctype<wchar_t> facet
BOOST_ASSERT(std::has_facet<std::ctype<wchar_t> >(std::locale()));
std::use_facet<std::ctype<wchar_t> >(std::locale())
.widen(source, source + len, result.get());
return result.get();
}
};
template <typename Char>
inline Char L(char c)
{
return string_lit<Char>::get(c);
}
template <typename Char>
inline std::basic_string<Char> L(char const* c = "")
{
return string_lit<Char>::get(c);
}
///////////////////////////////////////////////////////////////////////////
template <typename Char>
inline bool
generate_delimiter(std::basic_ostream<Char> &os_)
{
os_ << std::basic_string<Char>(80, '/') << "\n";
return os_.good();
}
///////////////////////////////////////////////////////////////////////////
// Generate a table of the names of the used lexer states, which is a bit
// tricky, because the table stored with the rules is sorted based on the
// names, but we need it sorted using the state ids.
template <typename Char>
inline bool
generate_cpp_state_info (boost::lexer::basic_rules<Char> const& rules_
, std::basic_ostream<Char> &os_, Char const* name_suffix)
{
// we need to re-sort the state names in ascending order of the state
// ids, filling possible gaps in between later
typedef typename
boost::lexer::basic_rules<Char>::string_size_t_map::const_iterator
state_iterator;
typedef std::map<std::size_t, Char const*> reverse_state_map_type;
reverse_state_map_type reverse_state_map;
state_iterator send = rules_.statemap().end();
for (state_iterator sit = rules_.statemap().begin(); sit != send; ++sit)
{
typedef typename reverse_state_map_type::value_type value_type;
reverse_state_map.insert(value_type((*sit).second, (*sit).first.c_str()));
}
generate_delimiter(os_);
os_ << "// this table defines the names of the lexer states\n";
os_ << boost::lexer::detail::strings<Char>::char_name()
<< " const* const lexer_state_names"
<< (name_suffix[0] ? "_" : "") << name_suffix
<< "[" << rules_.statemap().size() << "] = \n{\n";
typedef typename reverse_state_map_type::iterator iterator;
iterator rend = reverse_state_map.end();
std::size_t last_id = 0;
for (iterator rit = reverse_state_map.begin(); rit != rend; ++last_id)
{
for (/**/; last_id < (*rit).first; ++last_id)
{
os_ << " 0, // \"<undefined state>\"\n";
}
os_ << " "
<< boost::lexer::detail::strings<Char>::char_prefix()
<< "\"" << (*rit).second << "\"";
if (++rit != rend)
os_ << ",\n";
else
os_ << "\n"; // don't generate the final comma
}
os_ << "};\n\n";
generate_delimiter(os_);
os_ << "// this variable defines the number of lexer states\n";
os_ << "std::size_t const lexer_state_count"
<< (name_suffix[0] ? "_" : "") << name_suffix
<< " = " << rules_.statemap().size() << ";\n\n";
return os_.good();
}
template <typename Char>
inline bool
generate_cpp_state_table (std::basic_ostream<Char> &os_
, Char const* name_suffix, bool bol, bool eol)
{
std::basic_string<Char> suffix(L<Char>(name_suffix[0] ? "_" : ""));
suffix += name_suffix;
generate_delimiter(os_);
os_ << "// this defines a generic accessors for the information above\n";
os_ << "struct lexer" << suffix << "\n{\n";
os_ << " // version number and feature-set of compatible static lexer engine\n";
os_ << " enum\n";
os_ << " {\n static_version = " << SPIRIT_STATIC_LEXER_VERSION << ",\n";
os_ << " supports_bol = " << std::boolalpha << bol << ",\n";
os_ << " supports_eol = " << std::boolalpha << eol << "\n";
os_ << " };\n\n";
os_ << " // return the number of lexer states\n";
os_ << " static std::size_t state_count()\n";
os_ << " {\n return lexer_state_count" << suffix << "; \n }\n\n";
os_ << " // return the name of the lexer state as given by 'idx'\n";
os_ << " static " << boost::lexer::detail::strings<Char>::char_name()
<< " const* state_name(std::size_t idx)\n";
os_ << " {\n return lexer_state_names" << suffix << "[idx]; \n }\n\n";
os_ << " // return the next matched token\n";
os_ << " template<typename Iterator>\n";
os_ << " static std::size_t next(std::size_t &start_state_, bool& bol_\n";
os_ << " , Iterator &start_token_, Iterator const& end_, std::size_t& unique_id_)\n";
os_ << " {\n return next_token" << suffix
<< "(start_state_, bol_, start_token_, end_, unique_id_);\n }\n";
os_ << "};\n\n";
return os_.good();
}
///////////////////////////////////////////////////////////////////////////
// generate function body based on traversing the DFA tables
template <typename Char>
bool generate_function_body_dfa(std::basic_ostream<Char>& os_
, boost::lexer::basic_state_machine<Char> const &sm_)
{
std::size_t const dfas_ = sm_.data()._dfa->size();
std::size_t const lookups_ = sm_.data()._lookup->front()->size();
os_ << " enum {end_state_index, id_index, unique_id_index, "
"state_index, bol_index,\n";
os_ << " eol_index, dead_state_index, dfa_offset};\n\n";
os_ << " static std::size_t const npos = "
"static_cast<std::size_t>(~0);\n";
if (dfas_ > 1)
{
for (std::size_t state_ = 0; state_ < dfas_; ++state_)
{
std::size_t i_ = 0;
std::size_t j_ = 1;
std::size_t count_ = lookups_ / 8;
std::size_t const* lookup_ = &sm_.data()._lookup[state_]->front();
std::size_t const* dfa_ = &sm_.data()._dfa[state_]->front();
os_ << " static std::size_t const lookup" << state_
<< "_[" << lookups_ << "] = {\n ";
for (/**/; i_ < count_; ++i_)
{
std::size_t const index_ = i_ * 8;
os_ << lookup_[index_];
for (/**/; j_ < 8; ++j_)
{
os_ << ", " << lookup_[index_ + j_];
}
if (i_ < count_ - 1)
{
os_ << ",\n ";
}
j_ = 1;
}
os_ << " };\n";
count_ = sm_.data()._dfa[state_]->size ();
os_ << " static const std::size_t dfa" << state_ << "_["
<< count_ << "] = {\n ";
count_ /= 8;
for (i_ = 0; i_ < count_; ++i_)
{
std::size_t const index_ = i_ * 8;
os_ << dfa_[index_];
for (j_ = 1; j_ < 8; ++j_)
{
os_ << ", " << dfa_[index_ + j_];
}
if (i_ < count_ - 1)
{
os_ << ",\n ";
}
}
std::size_t const mod_ = sm_.data()._dfa[state_]->size () % 8;
if (mod_)
{
std::size_t const index_ = count_ * 8;
if (count_)
{
os_ << ",\n ";
}
os_ << dfa_[index_];
for (j_ = 1; j_ < mod_; ++j_)
{
os_ << ", " << dfa_[index_ + j_];
}
}
os_ << " };\n";
}
std::size_t count_ = sm_.data()._dfa_alphabet.size();
std::size_t i_ = 1;
os_ << " static std::size_t const* lookup_arr_[" << count_
<< "] = { lookup0_";
for (i_ = 1; i_ < count_; ++i_)
{
os_ << ", " << "lookup" << i_ << "_";
}
os_ << " };\n";
os_ << " static std::size_t const dfa_alphabet_arr_["
<< count_ << "] = { ";
os_ << sm_.data()._dfa_alphabet.front ();
for (i_ = 1; i_ < count_; ++i_)
{
os_ << ", " << sm_.data()._dfa_alphabet[i_];
}
os_ << " };\n";
os_ << " static std::size_t const* dfa_arr_[" << count_
<< "] = { ";
os_ << "dfa0_";
for (i_ = 1; i_ < count_; ++i_)
{
os_ << ", " << "dfa" << i_ << "_";
}
os_ << " };\n";
}
else
{
std::size_t const* lookup_ = &sm_.data()._lookup[0]->front();
std::size_t const* dfa_ = &sm_.data()._dfa[0]->front();
std::size_t i_ = 0;
std::size_t j_ = 1;
std::size_t count_ = lookups_ / 8;
os_ << " static std::size_t const lookup_[";
os_ << sm_.data()._lookup[0]->size() << "] = {\n ";
for (/**/; i_ < count_; ++i_)
{
const std::size_t index_ = i_ * 8;
os_ << lookup_[index_];
for (/**/; j_ < 8; ++j_)
{
os_ << ", " << lookup_[index_ + j_];
}
if (i_ < count_ - 1)
{
os_ << ",\n ";
}
j_ = 1;
}
os_ << " };\n";
os_ << " static std::size_t const dfa_alphabet_ = "
<< sm_.data()._dfa_alphabet.front () << ";\n";
os_ << " static std::size_t const dfa_["
<< sm_.data()._dfa[0]->size () << "] = {\n ";
count_ = sm_.data()._dfa[0]->size () / 8;
for (i_ = 0; i_ < count_; ++i_)
{
const std::size_t index_ = i_ * 8;
os_ << dfa_[index_];
for (j_ = 1; j_ < 8; ++j_)
{
os_ << ", " << dfa_[index_ + j_];
}
if (i_ < count_ - 1)
{
os_ << ",\n ";
}
}
const std::size_t mod_ = sm_.data()._dfa[0]->size () % 8;
if (mod_)
{
const std::size_t index_ = count_ * 8;
if (count_)
{
os_ << ",\n ";
}
os_ << dfa_[index_];
for (j_ = 1; j_ < mod_; ++j_)
{
os_ << ", " << dfa_[index_ + j_];
}
}
os_ << " };\n";
}
os_ << "\n if (start_token_ == end_)\n";
os_ << " {\n";
os_ << " unique_id_ = npos;\n";
os_ << " return 0;\n";
os_ << " }\n\n";
if (sm_.data()._seen_BOL_assertion)
{
os_ << " bool bol = bol_;\n\n";
}
if (dfas_ > 1)
{
os_ << "again:\n";
os_ << " std::size_t const* lookup_ = lookup_arr_[start_state_];\n";
os_ << " std::size_t dfa_alphabet_ = dfa_alphabet_arr_[start_state_];\n";
os_ << " std::size_t const*dfa_ = dfa_arr_[start_state_];\n";
}
os_ << " std::size_t const* ptr_ = dfa_ + dfa_alphabet_;\n";
os_ << " Iterator curr_ = start_token_;\n";
os_ << " bool end_state_ = *ptr_ != 0;\n";
os_ << " std::size_t id_ = *(ptr_ + id_index);\n";
os_ << " std::size_t uid_ = *(ptr_ + unique_id_index);\n";
if (dfas_ > 1)
{
os_ << " std::size_t end_start_state_ = start_state_;\n";
}
if (sm_.data()._seen_BOL_assertion)
{
os_ << " bool end_bol_ = bol_;\n";
}
os_ << " Iterator end_token_ = start_token_;\n\n";
os_ << " while (curr_ != end_)\n";
os_ << " {\n";
if (sm_.data()._seen_BOL_assertion)
{
os_ << " std::size_t const BOL_state_ = ptr_[bol_index];\n\n";
}
if (sm_.data()._seen_EOL_assertion)
{
os_ << " std::size_t const EOL_state_ = ptr_[eol_index];\n\n";
}
if (sm_.data()._seen_BOL_assertion && sm_.data()._seen_EOL_assertion)
{
os_ << " if (BOL_state_ && bol)\n";
os_ << " {\n";
os_ << " ptr_ = &dfa_[BOL_state_ * dfa_alphabet_];\n";
os_ << " }\n";
os_ << " else if (EOL_state_ && *curr_ == '\\n')\n";
os_ << " {\n";
os_ << " ptr_ = &dfa_[EOL_state_ * dfa_alphabet_];\n";
os_ << " }\n";
os_ << " else\n";
os_ << " {\n";
if (lookups_ == 256)
{
os_ << " unsigned char index = \n";
os_ << " static_cast<unsigned char>(*curr_++);\n";
}
else
{
os_ << " std::size_t index = *curr_++\n";
}
os_ << " bol = (index == '\\n') ? true : false;\n";
os_ << " std::size_t const state_ = ptr_[\n";
os_ << " lookup_[static_cast<std::size_t>(index)]];\n";
os_ << '\n';
os_ << " if (state_ == 0) break;\n";
os_ << '\n';
os_ << " ptr_ = &dfa_[state_ * dfa_alphabet_];\n";
os_ << " }\n\n";
}
else if (sm_.data()._seen_BOL_assertion)
{
os_ << " if (BOL_state_ && bol)\n";
os_ << " {\n";
os_ << " ptr_ = &dfa_[BOL_state_ * dfa_alphabet_];\n";
os_ << " }\n";
os_ << " else\n";
os_ << " {\n";
if (lookups_ == 256)
{
os_ << " unsigned char index = \n";
os_ << " static_cast<unsigned char>(*curr_++);\n";
}
else
{
os_ << " std::size_t index = *curr_++\n";
}
os_ << " bol = (index == '\\n') ? true : false;\n";
os_ << " std::size_t const state_ = ptr_[\n";
os_ << " lookup_[static_cast<std::size_t>(index)]];\n";
os_ << '\n';
os_ << " if (state_ == 0) break;\n";
os_ << '\n';
os_ << " ptr_ = &dfa_[state_ * dfa_alphabet_];\n";
os_ << " }\n\n";
}
else if (sm_.data()._seen_EOL_assertion)
{
os_ << " if (EOL_state_ && *curr_ == '\\n')\n";
os_ << " {\n";
os_ << " ptr_ = &dfa_[EOL_state_ * dfa_alphabet_];\n";
os_ << " }\n";
os_ << " else\n";
os_ << " {\n";
if (lookups_ == 256)
{
os_ << " unsigned char index = \n";
os_ << " static_cast<unsigned char>(*curr_++);\n";
}
else
{
os_ << " std::size_t index = *curr_++\n";
}
os_ << " bol = (index == '\\n') ? true : false;\n";
os_ << " std::size_t const state_ = ptr_[\n";
os_ << " lookup_[static_cast<std::size_t>(index)]];\n";
os_ << '\n';
os_ << " if (state_ == 0) break;\n";
os_ << '\n';
os_ << " ptr_ = &dfa_[state_ * dfa_alphabet_];\n";
os_ << " }\n\n";
}
else
{
os_ << " std::size_t const state_ =\n";
if (lookups_ == 256)
{
os_ << " ptr_[lookup_["
"static_cast<unsigned char>(*curr_++)]];\n";
}
else
{
os_ << " ptr_[lookup_[*curr_++]];\n";
}
os_ << '\n';
os_ << " if (state_ == 0) break;\n";
os_ << '\n';
os_ << " ptr_ = &dfa_[state_ * dfa_alphabet_];\n\n";
}
os_ << " if (*ptr_)\n";
os_ << " {\n";
os_ << " end_state_ = true;\n";
os_ << " id_ = *(ptr_ + id_index);\n";
os_ << " uid_ = *(ptr_ + unique_id_index);\n";
if (dfas_ > 1)
{
os_ << " end_start_state_ = *(ptr_ + state_index);\n";
}
if (sm_.data()._seen_BOL_assertion)
{
os_ << " end_bol_ = bol;\n";
}
os_ << " end_token_ = curr_;\n";
os_ << " }\n";
os_ << " }\n\n";
if (sm_.data()._seen_EOL_assertion)
{
os_ << " std::size_t const EOL_state_ = ptr_[eol_index];\n\n";
os_ << " if (EOL_state_ && curr_ == end_)\n";
os_ << " {\n";
os_ << " ptr_ = &dfa_[EOL_state_ * dfa_alphabet_];\n\n";
os_ << " if (*ptr_)\n";
os_ << " {\n";
os_ << " end_state_ = true;\n";
os_ << " id_ = *(ptr_ + id_index);\n";
os_ << " uid_ = *(ptr_ + unique_id_index);\n";
if (dfas_ > 1)
{
os_ << " end_start_state_ = *(ptr_ + state_index);\n";
}
if (sm_.data()._seen_BOL_assertion)
{
os_ << " end_bol_ = bol;\n";
}
os_ << " end_token_ = curr_;\n";
os_ << " }\n";
os_ << " }\n\n";
}
os_ << " if (end_state_)\n";
os_ << " {\n";
os_ << " // return longest match\n";
os_ << " start_token_ = end_token_;\n";
if (dfas_ > 1)
{
os_ << " start_state_ = end_start_state_;\n";
os_ << " if (id_ == 0)\n";
os_ << " {\n";
if (sm_.data()._seen_BOL_assertion)
{
os_ << " bol = end_bol_;\n";
}
os_ << " goto again;\n";
os_ << " }\n";
if (sm_.data()._seen_BOL_assertion)
{
os_ << " else\n";
os_ << " {\n";
os_ << " bol_ = end_bol_;\n";
os_ << " }\n";
}
}
else if (sm_.data()._seen_BOL_assertion)
{
os_ << " bol_ = end_bol_;\n";
}
os_ << " }\n";
os_ << " else\n";
os_ << " {\n";
if (sm_.data()._seen_BOL_assertion)
{
os_ << " bol_ = (*start_token_ == '\\n') ? true : false;\n";
}
os_ << " id_ = npos;\n";
os_ << " uid_ = npos;\n";
os_ << " }\n\n";
os_ << " unique_id_ = uid_;\n";
os_ << " return id_;\n";
return os_.good();
}
///////////////////////////////////////////////////////////////////////////
template <typename Char>
inline std::basic_string<Char> get_charlit(Char ch)
{
std::basic_string<Char> result;
boost::lexer::basic_string_token<Char>::escape_char(ch, result);
return result;
}
// check whether state0_0 is referenced from any of the other states
template <typename Char>
bool need_label0_0(boost::lexer::basic_state_machine<Char> const &sm_)
{
typedef typename boost::lexer::basic_state_machine<Char>::iterator
iterator_type;
iterator_type iter_ = sm_.begin();
std::size_t const states_ = iter_->states;
for (std::size_t state_ = 0; state_ < states_; ++state_)
{
if (0 == iter_->bol_index || 0 == iter_->eol_index)
{
return true;
}
std::size_t const transitions_ = iter_->transitions;
for (std::size_t t_ = 0; t_ < transitions_; ++t_)
{
if (0 == iter_->goto_state)
{
return true;
}
++iter_;
}
if (transitions_ == 0) ++iter_;
}
return false;
}
///////////////////////////////////////////////////////////////////////////
template <typename Char>
bool generate_function_body_switch(std::basic_ostream<Char> & os_
, boost::lexer::basic_state_machine<Char> const &sm_)
{
typedef typename boost::lexer::basic_state_machine<Char>::iterator
iterator_type;
std::size_t const lookups_ = sm_.data()._lookup->front ()->size ();
iterator_type iter_ = sm_.begin();
iterator_type labeliter_ = iter_;
iterator_type end_ = sm_.end();
std::size_t const dfas_ = sm_.data()._dfa->size ();
os_ << " static std::size_t const npos = "
"static_cast<std::size_t>(~0);\n";
os_ << "\n if (start_token_ == end_)\n";
os_ << " {\n";
os_ << " unique_id_ = npos;\n";
os_ << " return 0;\n";
os_ << " }\n\n";
if (sm_.data()._seen_BOL_assertion)
{
os_ << " bool bol = bol_;\n";
}
if (dfas_ > 1)
{
os_ << "again:\n";
}
os_ << " Iterator curr_ = start_token_;\n";
os_ << " bool end_state_ = false;\n";
os_ << " std::size_t id_ = npos;\n";
os_ << " std::size_t uid_ = npos;\n";
if (dfas_ > 1)
{
os_ << " std::size_t end_start_state_ = start_state_;\n";
}
if (sm_.data()._seen_BOL_assertion)
{
os_ << " bool end_bol_ = bol_;\n";
}
os_ << " Iterator end_token_ = start_token_;\n";
os_ << '\n';
os_ << " " << ((lookups_ == 256) ? "char" : "wchar_t")
<< " ch_ = 0;\n\n";
if (dfas_ > 1)
{
os_ << " switch (start_state_)\n";
os_ << " {\n";
for (std::size_t i_ = 0; i_ < dfas_; ++i_)
{
os_ << " case " << i_ << ":\n";
os_ << " goto state" << i_ << "_0;\n";
os_ << " break;\n";
}
os_ << " default:\n";
os_ << " goto end;\n";
os_ << " break;\n";
os_ << " }\n";
}
bool need_state0_0_label = need_label0_0(sm_);
for (std::size_t dfa_ = 0; dfa_ < dfas_; ++dfa_)
{
std::size_t const states_ = iter_->states;
for (std::size_t state_ = 0; state_ < states_; ++state_)
{
std::size_t const transitions_ = iter_->transitions;
std::size_t t_ = 0;
if (dfas_ > 1 || dfa_ != 0 || state_ != 0 || need_state0_0_label)
{
os_ << "\nstate" << dfa_ << '_' << state_ << ":\n";
}
if (iter_->end_state)
{
os_ << " end_state_ = true;\n";
os_ << " id_ = " << iter_->id << ";\n";
os_ << " uid_ = " << iter_->unique_id << ";\n";
os_ << " end_token_ = curr_;\n";
if (dfas_ > 1)
{
os_ << " end_start_state_ = " << iter_->goto_dfa <<
";\n";
}
if (sm_.data()._seen_BOL_assertion)
{
os_ << " end_bol_ = bol;\n";
}
if (transitions_) os_ << '\n';
}
if (t_ < transitions_ ||
iter_->bol_index != boost::lexer::npos ||
iter_->eol_index != boost::lexer::npos)
{
os_ << " if (curr_ == end_) goto end;\n";
os_ << " ch_ = *curr_;\n";
if (iter_->bol_index != boost::lexer::npos)
{
os_ << "\n if (bol) goto state" << dfa_ << '_'
<< iter_->bol_index << ";\n";
}
if (iter_->eol_index != boost::lexer::npos)
{
os_ << "\n if (ch_ == '\\n') goto state" << dfa_
<< '_' << iter_->eol_index << ";\n";
}
os_ << " ++curr_;\n";
}
for (/**/; t_ < transitions_; ++t_)
{
Char const *ptr_ = iter_->token._charset.c_str();
Char const *end2_ = ptr_ + iter_->token._charset.size();
Char start_char_ = 0;
Char curr_char_ = 0;
bool range_ = false;
bool first_char_ = true;
os_ << "\n if (";
while (ptr_ != end2_)
{
curr_char_ = *ptr_++;
if (*ptr_ == curr_char_ + 1)
{
if (!range_)
{
start_char_ = curr_char_;
}
range_ = true;
}
else
{
if (!first_char_)
{
os_ << ((iter_->token._negated) ? " && " : " || ");
}
else
{
first_char_ = false;
}
if (range_)
{
if (iter_->token._negated)
{
os_ << "!";
}
os_ << "(ch_ >= '" << get_charlit(start_char_)
<< "' && ch_ <= '"
<< get_charlit(curr_char_) << "')";
range_ = false;
}
else
{
os_ << "ch_ "
<< ((iter_->token._negated) ? "!=" : "==")
<< " '" << get_charlit(curr_char_) << "'";
}
}
}
os_ << ") goto state" << dfa_ << '_' << iter_->goto_state
<< ";\n";
++iter_;
}
if (!(dfa_ == dfas_ - 1 && state_ == states_ - 1))
{
os_ << " goto end;\n";
}
if (transitions_ == 0) ++iter_;
}
}
os_ << "\nend:\n";
os_ << " if (end_state_)\n";
os_ << " {\n";
os_ << " // return longest match\n";
os_ << " start_token_ = end_token_;\n";
if (dfas_ > 1)
{
os_ << " start_state_ = end_start_state_;\n";
os_ << "\n if (id_ == 0)\n";
os_ << " {\n";
if (sm_.data()._seen_BOL_assertion)
{
os_ << " bol = end_bol_;\n";
}
os_ << " goto again;\n";
os_ << " }\n";
if (sm_.data()._seen_BOL_assertion)
{
os_ << " else\n";
os_ << " {\n";
os_ << " bol_ = end_bol_;\n";
os_ << " }\n";
}
}
else if (sm_.data()._seen_BOL_assertion)
{
os_ << " bol_ = end_bol_;\n";
}
os_ << " }\n";
os_ << " else\n";
os_ << " {\n";
if (sm_.data()._seen_BOL_assertion)
{
os_ << " bol_ = (*start_token_ == '\\n') ? true : false;\n";
}
os_ << " id_ = npos;\n";
os_ << " uid_ = npos;\n";
os_ << " }\n\n";
os_ << " unique_id_ = uid_;\n";
os_ << " return id_;\n";
return os_.good();
}
///////////////////////////////////////////////////////////////////////////
// Generate a tokenizer for the given state machine.
template <typename Char, typename F>
inline bool
generate_cpp (boost::lexer::basic_state_machine<Char> const& sm_
, boost::lexer::basic_rules<Char> const& rules_
, std::basic_ostream<Char> &os_, Char const* name_suffix
, F generate_function_body)
{
if (sm_.data()._lookup->empty())
return false;
std::size_t const dfas_ = sm_.data()._dfa->size();
// std::size_t const lookups_ = sm_.data()._lookup->front()->size();
os_ << "// Copyright (c) 2008-2009 Ben Hanson\n";
os_ << "// Copyright (c) 2008-2011 Hartmut Kaiser\n";
os_ << "//\n";
os_ << "// Distributed under the Boost Software License, "
"Version 1.0. (See accompanying\n";
os_ << "// file licence_1_0.txt or copy at "
"http://www.boost.org/LICENSE_1_0.txt)\n\n";
os_ << "// Auto-generated by boost::lexer, do not edit\n\n";
std::basic_string<Char> guard(name_suffix);
guard += L<Char>(name_suffix[0] ? "_" : "");
guard += L<Char>(__DATE__ "_" __TIME__);
typename std::basic_string<Char>::size_type p =
guard.find_first_of(L<Char>(": "));
while (std::string::npos != p)
{
guard.replace(p, 1, L<Char>("_"));
p = guard.find_first_of(L<Char>(": "), p);
}
{ // to_upper(guard)
typedef std::ctype<Char> facet_t;
facet_t const& facet = std::use_facet<facet_t>(std::locale());
typedef typename std::basic_string<Char>::iterator iter_t;
for (iter_t iter = guard.begin(),
last = guard.end(); iter != last; ++iter)
*iter = facet.toupper(*iter);
}
os_ << "#if !defined(BOOST_SPIRIT_LEXER_NEXT_TOKEN_" << guard << ")\n";
os_ << "#define BOOST_SPIRIT_LEXER_NEXT_TOKEN_" << guard << "\n\n";
os_ << "#include <boost/spirit/home/support/detail/lexer/char_traits.hpp>\n\n";
generate_delimiter(os_);
os_ << "// the generated table of state names and the tokenizer have to be\n"
"// defined in the boost::spirit::lex::lexertl::static_ namespace\n";
os_ << "namespace boost { namespace spirit { namespace lex { "
"namespace lexertl { namespace static_ {\n\n";
// generate the lexer state information variables
if (!generate_cpp_state_info(rules_, os_, name_suffix))
return false;
generate_delimiter(os_);
os_ << "// this function returns the next matched token\n";
os_ << "template<typename Iterator>\n";
os_ << "std::size_t next_token" << (name_suffix[0] ? "_" : "")
<< name_suffix << " (";
if (dfas_ > 1)
{
os_ << "std::size_t& start_state_, ";
}
else
{
os_ << "std::size_t& /*start_state_*/, ";
}
if (sm_.data()._seen_BOL_assertion)
{
os_ << "bool& bol_, ";
}
else
{
os_ << "bool& /*bol_*/, ";
}
os_ << "\n ";
os_ << "Iterator &start_token_, Iterator const& end_, ";
os_ << "std::size_t& unique_id_)\n";
os_ << "{\n";
if (!generate_function_body(os_, sm_))
return false;
os_ << "}\n\n";
if (!generate_cpp_state_table<Char>(os_, name_suffix
, sm_.data()._seen_BOL_assertion, sm_.data()._seen_EOL_assertion))
{
return false;
}
os_ << "}}}}} // namespace boost::spirit::lex::lexertl::static_\n\n";
os_ << "#endif\n";
return os_.good();
}
} // namespace detail
///////////////////////////////////////////////////////////////////////////
template <typename Lexer, typename F>
inline bool
generate_static(Lexer const& lexer
, std::basic_ostream<typename Lexer::char_type>& os
, typename Lexer::char_type const* name_suffix, F f)
{
if (!lexer.init_dfa(true)) // always minimize DFA for static lexers
return false;
return detail::generate_cpp(lexer.state_machine_, lexer.rules_, os
, name_suffix, f);
}
///////////////////////////////////////////////////////////////////////////
// deprecated function, will be removed in the future (this has been
// replaced by the function generate_static_dfa - see below).
template <typename Lexer>
inline bool
generate_static(Lexer const& lexer
, std::basic_ostream<typename Lexer::char_type>& os
, typename Lexer::char_type const* name_suffix =
detail::L<typename Lexer::char_type>())
{
return generate_static(lexer, os, name_suffix
, &detail::generate_function_body_dfa<typename Lexer::char_type>);
}
///////////////////////////////////////////////////////////////////////////
template <typename Lexer>
inline bool
generate_static_dfa(Lexer const& lexer
, std::basic_ostream<typename Lexer::char_type>& os
, typename Lexer::char_type const* name_suffix =
detail::L<typename Lexer::char_type>())
{
return generate_static(lexer, os, name_suffix
, &detail::generate_function_body_dfa<typename Lexer::char_type>);
}
///////////////////////////////////////////////////////////////////////////
template <typename Lexer>
inline bool
generate_static_switch(Lexer const& lexer
, std::basic_ostream<typename Lexer::char_type>& os
, typename Lexer::char_type const* name_suffix =
detail::L<typename Lexer::char_type>())
{
return generate_static(lexer, os, name_suffix
, &detail::generate_function_body_switch<typename Lexer::char_type>);
}
///////////////////////////////////////////////////////////////////////////////
}}}}
#endif