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/* This file is part of the Spring engine (GPL v2 or later), see LICENSE.html */
#ifndef TDF_GRAMMAR_H
#define TDF_GRAMMAR_H
#include <map>
#include <list>
#include <iostream>
#include <string>
#include <boost/version.hpp>
#include <boost/spirit/include/classic.hpp>
#include <boost/spirit/include/phoenix1_binders.hpp>
using namespace boost::spirit::classic;
#include "System/TdfParser.h"
/**
* \brief Simple std::ostream Actor, with fixed prefix or suffix.
* This actor prints the item parsed using the ostream, enclosed
* by suffix and prefix string.
*/
class ostream_actor
{
private:
std::ostream & ref;
std::string prefix, suffix;
public:
ostream_actor(std::ostream & ref_, std::string const& addition = "")
: ref(ref_), suffix(addition)
{}
ostream_actor(std::string prefix, std::ostream & ref_, std::string const& addition = "")
: ref(ref_), prefix(prefix), suffix(addition)
{}
template<typename T2> void operator()(T2 const& val) const { ref << prefix << val << suffix; }
template<typename IteratorT>
void operator()(IteratorT const& first, IteratorT const& last) const { ref << prefix << std::string(first, last) << suffix; }
};
/**
* \name Actor functions
* use these two functions to create a semantic action with ostream_actor.
* \{
*/
inline ostream_actor ostream_a(std::string const& prefix, std::ostream& ref, std::string const& suffix = "")
{
return ostream_actor(prefix, ref, suffix);
}
inline ostream_actor ostream_a(std::ostream& ref, std::string const& suffix = "")
{
return ostream_actor(ref, suffix);
}
/**
* \}
*/
struct tdf_grammar : public grammar<tdf_grammar>
{
enum Errors {
semicolon_expected
, equals_sign_expected
, square_bracket_expected
, brace_expected
};
struct section_closure : closure<section_closure, TdfParser::TdfSection*> {
member1 context;
};
struct string_closure : closure<string_closure, std::string> {
member1 name;
};
tdf_grammar(TdfParser::TdfSection* sec, std::list<std::string>* junk_data)
: section(sec), junk(junk_data)
{}
template<typename ScannerT>
struct definition
{
definition(tdf_grammar const& self)
: expect_semicolon(semicolon_expected)
, expect_equals_sign(equals_sign_expected)
, expect_square_bracket(square_bracket_expected)
, expect_brace(brace_expected)
{
using namespace boost::spirit;
using namespace phoenix;
tdf = *(
section(self.section)
| gather_junk_line // if this rule gets hit, then section did not consume everything,
)
>> end_p
;
gather_junk_line =
lexeme_d[
(+(~chset<>("}[\n")))
[ push_back_a(* self.junk ) ]
// [ ostream_a("Junk detected:", std::cout, "\n") ] // debug printouts
]
;
name = (+(~chset<>(";{[]}=\n"))) // allows pretty much everything that isnt already used
[ name.name = construct_<std::string>(arg1, arg2) ]
;
section = '['
>> name
// [ ostream_a("Just parsed a section: ", std::cout, "\n") ] // prints section name
[ section.context = phoenix::bind(&TdfParser::TdfSection::construct_subsection)(section.context, arg1) ]
>> expect_square_bracket(ch_p(']'))
>> expect_brace (ch_p('{'))
>> *
(
(
name
[var(temp1) = arg1]
>> ch_p('=') // turn this into expect_equals_sign(ch_p('=')) if you want more strict parsing
>> lexeme_d[ (*~ch_p(';')) // might be empty too!
[ phoenix::bind(&TdfParser::TdfSection::add_name_value)(section.context, var(temp1), construct_<std::string>(arg1,arg2)) ]
]
>> expect_semicolon(ch_p(';'))
)
| section(section.context)
| gather_junk_line // if this rule gets touched we either hit a closing section } or there really is junk
)
>> expect_brace(ch_p('}'))
;
}
rule<ScannerT> const& start() const { return tdf; }
rule<ScannerT> tdf, gather_junk_line;
rule<ScannerT, string_closure::context_t> name;
rule<ScannerT, section_closure::context_t> section;
assertion<Errors> expect_semicolon, expect_equals_sign, expect_square_bracket, expect_brace;
std::string temp1;
};
TdfParser::TdfSection* section;
mutable std::list<std::string>* junk;
};
#endif // TDF_GRAMMAR_H
|
