66 lines
2.0 KiB
C++
66 lines
2.0 KiB
C++
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#include <string>
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#include <iostream>
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#include <pegtl.hh>
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using namespace pegtl;
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namespace query
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{
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// strings
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struct unicode : list< seq< one< 'u' >, rep< 4, must< xdigit > > >, one< '\\' > > {};
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struct escaped_char : one< '"', '\\', '/', 'b', 'f', 'n', 'r', 't' > {};
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struct escaped : sor< escaped_char, unicode > {};
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struct unescaped : utf8::range< 0x20, 0x10FFFF > {};
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struct char_ : if_then_else< one< '\\' >, must< escaped >, unescaped > {};
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struct string_content : until< at< one< '"' > >, must< char_ > > {};
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struct string : seq< one< '"' >, must< string_content >, any >
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{
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using content = string_content;
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};
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// numbers
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struct minus : opt< one< '-' > > {};
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struct dot : one< '.' > {};
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struct float_num : sor<
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seq< plus< digit >, dot, star< digit > >,
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seq< star< digit >, dot, plus< digit > >
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> {};
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struct hex_num : seq< one< '0' >, one< 'x', 'X' >, plus< xdigit > > {};
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struct int_num : plus< digit > {};
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struct number : seq< minus, sor< float_num, hex_num, int_num > > {};
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// key paths
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struct key_path : list< must< sor< alpha, one< '_' > >, star< sor< alnum, one< '_', '-' > > > >, one< '.' > > {};
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// expressions and operators
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struct expr : sor< string, key_path, number > {};
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struct oper : sor< one< '=' >, istring< '=', '=' >, istring< '!', '=' >, one< '<' >, istring< '<', '=' >, one< '>' >, istring< '>', '=' > > {};
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// predicates
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struct pred : seq< expr, plus< blank >, oper, plus< blank >, expr > {};
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// rules
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template< typename Rule >
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struct action : nothing< Rule > {};
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template<> struct action< expr >
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{
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static void apply( const input & in, std::string & string_value )
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{
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std::cout << in.string() << std::endl;
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}
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};
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}
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int main( int argc, char ** argv )
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{
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if ( argc > 1 ) {
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std::string intstring;
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parse< must< query::expr, eof>, query::action >( 1, argv, intstring);
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}
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}
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