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#include <boost/spirit/include/qi.hpp>
#include <boost/spirit/include/phoenix_core.hpp>
#include <boost/spirit/include/phoenix_operator.hpp>
#include <boost/spirit/include/phoenix_stl.hpp>
#include <boost/spirit/include/phoenix_object.hpp>
#include <boost/spirit/include/phoenix_bind.hpp>
#include <boost/spirit/home/phoenix/statement.hpp>
#include <string>
#include <vector>
#include <iostream>
namespace wml{
namespace ast
{
struct attribute
{
attribute(const std::string& key, const std::string& value):key(key), value(value){}
attribute(const std::string& key):key(key){}
std::string key;
std::string value;
};
typedef std::vector<attribute> multi_attribute;
}}
namespace wml {
namespace grammar {
namespace phoenix = boost::phoenix;
namespace qi = boost::spirit::qi;
namespace ascii = boost::spirit::ascii;
template <typename Iterator>
struct multi_attribute : qi::grammar<Iterator, ast::multi_attribute(), qi::locals<int>, ascii::space_type>
{
multi_attribute() : multi_attribute::base_type(multi_attribute_rule, "multi attribute")
{
using ascii::char_;
using qi::lexeme;
using qi::eol;
using qi::eoi;
using qi::eps;
using namespace qi::labels;
using phoenix::bind;
using phoenix::ref;
using phoenix::construct;
using phoenix::val;
using phoenix::at;
using phoenix::push_back;
using phoenix::if_;
using phoenix::back;
using phoenix::size;
string_rule = lexeme[+(char_("a-zA-Z0-9") | char_('.'))];
key = string_rule;
value = string_rule;
multi_attribute_rule =
eps[_a = 0] // utilisation du parser eps qui réussit toujours pour initialiser la variable locale _a
> key[push_back(_val, construct<ast::attribute>(_1))] % ',' // constructeur ast::attribute(const std::string& key)
> '='
// le texte est parsé de gauche à droite donc à ce stade le std::vector<attribute> _val possède déjà sa taille finale (nombre de clé)
> value[if_( _a < size(_val))
[
phoenix::bind(&ast::attribute::value, at(_val, _a)) = _1,
_a++
]
.else_
[
phoenix::bind(&ast::attribute::value, back(_val)) += ',' + _1
]
]
% ','
> (eol | eoi)
;
multi_attribute_rule.name("multi attribute");
qi::on_error<qi::fail>
(
multi_attribute_rule,
std::cout
<< val("Error! Expecting ")
<< _4 // what failed?
<< val(" here: \"")
<< construct<std::string>(_3, _2) // iterators to error-pos, end
<< val("\"")
<< std::endl
);
}
qi::rule<Iterator, ast::multi_attribute(), qi::locals<int>, ascii::space_type> multi_attribute_rule;
qi::rule<Iterator, std::string(), ascii::space_type> key;
qi::rule<Iterator, std::string(), ascii::space_type> value;
qi::rule<Iterator, std::string(), ascii::space_type> string_rule;
};
}
namespace printer
{
struct multi_attribute
{
multi_attribute(){}
void operator()(const ast::multi_attribute& multi_attr)
{
for(const wml::ast::attribute& attr : multi_attr)
{
std::cout << attr.key << ":" << attr.value << "\n";
}
}
};
}}
template <typename grammar, typename ast>
struct wml_test
{
wml_test(){}
void operator()(const std::string& value)
{
ast wml_tree;
grammar wml;
using boost::spirit::ascii::space;
using namespace boost::spirit::qi;
std::string::const_iterator iter = value.begin();
std::string::const_iterator end = value.end();
bool r = phrase_parse(iter, end, wml, space, wml_tree);
if (r && iter == end)
{
std::cout << "ok" << std::endl;
wml::printer::multi_attribute()(wml_tree);
}
else
{
std::string::const_iterator some = iter+2;
std::string context(iter, (some>end)?end:some);
std::cout << "ko\n";
std::cout << "stopped at: \": " << context << "...\"\n";
}
}
};
int main(int argc, char **argv)
{
typedef wml::grammar::multi_attribute<std::string::const_iterator> grammar;
wml_test<grammar, wml::ast::multi_attribute> test;
test("key=value\n");
test("key = value\n");
test("key1, key2 = value1, value2\n");
test("key1, key2, key3, key4 = value1, value2, value3, value4\n");
test("key1 = value1, value2\n");
test("key1, key2 = value1\n");
test("key1 , key2 , key3 = value1 , value2");
test("key1 , key2 = value1 , value2, value3 , value4");
return 0;
} |
