namespace console {
namespace detail {
+#ifndef DOXYGEN
+
+ ///////////////////////////////////////////////////////////////////////////
+ // append_a
+
struct append_action
{
template <class T, class Value>
template <class T>
inline boost::spirit::ref_value_actor<T, append_action>
append_a(T & ref)
- {
- return boost::spirit::ref_value_actor<T, append_action>(ref);
- }
+ { return boost::spirit::ref_value_actor<T, append_action>(ref); }
template <class T, class Value>
inline boost::spirit::ref_const_ref_actor<T, Value, append_action>
append_a(T & ref, Value const & value)
- {
- return boost::spirit::ref_const_ref_actor<T, Value, append_action>(ref, value);
- }
+ { return boost::spirit::ref_const_ref_actor<T, Value, append_action>(ref, value); }
+
+ ///////////////////////////////////////////////////////////////////////////
+ // Grammar
template <class ParseDispatcher>
struct CommandGrammar : boost::spirit::grammar<CommandGrammar<ParseDispatcher> >
{
boost::spirit::rule<Scanner> command, path, argument, word, string, hexstring, token,
punctuation, hexbyte, balanced_tokens, simple_argument, complex_argument, builtin,
- skip, commands, block, statement;
+ skip, commands, block, statement, relpath, abspath;
boost::spirit::chset<> special_p, punctuation_p, space_p, invalid_p, word_p;
boost::spirit::distinct_parser<> keyword_p;
special_p ("/(){};"),
// Characters which are returned as punctuation tokens
- punctuation_p (",="),
+ // (only allowed within '()')
+ punctuation_p (",=/{};"),
// Whitespace characters
space_p (" \t\n\r"),
using namespace boost::spirit;
typedef ParseDispatcher PD;
+ ///////////////////////////////////////////////////////////////////
+ // Spirit grammar
+ //
+ // Syntax summary:
+ // This is EBNF with some minor tweaks to accommodate C++ syntax
+ //
+ // * and + like EBNF but they precede their argument
+ // >> is followed by
+ // ! optional
+ // a % b match any number of a's separated by b
+ // a - b match a but not b
+ //
+ // Beside this, we use some special parsers (ch_p, eps_p, confix_p, lex_escape_ch_p,
+ // keyword_p, comment_p) and directives (lexeme_d), however, the parser should be
+ // quite readable.
+ //
+ // ch_p match character
+ // eps_p always matches nothing (to attach unconditional actions)
+ // confix_p(a,b,c) match b, preceded by a and terminated by c. Used to parse
+ // string literals and comments
+ // lex_escape_ch_p match a lex style escape char. This is like a C++ style
+ // literal string escape char, however \x will be replaced by 'x'
+ // for any char 'x' if it has no special meaning.
+ // keyword_p match a delimited keyword
+ // comment_p(a,b) match comment starting with a and terminated with b. b
+ // defaults to end-of-line
+ //
+ // lexeme_d don't skip whitespace (as defined by the skip parser)
+ //
+ // Aligned to the right at column 50 are semantic actions.
+ //
+ // For clarity, I have used 'ch_p' explicitly throughout even though it is optional
+ // in most cases.
+ //
+ // More info is in the Boost.Spirit documentation
+
commands
= * command
;
command
- = builtin
+ = builtin >> (ch_p(';') | end_p)
| path >> ( block | statement )
+ | ch_p(';') // Ignore empty commands
;
builtin
>> path
>> eps_p [ self.dispatch(&PD::builtin_cd,
boost::ref(self.context.path)) ]
- | keyword_p("ls")
+ | keyword_p("ls")
>> ! path
>> eps_p [ self.dispatch(&PD::builtin_ls,
boost::ref(self.context.path)) ]
| keyword_p("exit") [ self.dispatch(&PD::builtin_exit) ]
+
+ | keyword_p("help")
+ >> ! path
+ >> eps_p [ self.dispatch(&PD::builtin_help,
+ boost::ref(self.context.path)) ]
;
block
path // Returns value in context.path
= eps_p [ clear_a(self.context.path) ]
- >> ( ! ch_p('/') [ push_back_a(self.context.path, "") ] )
- >> ( word [ push_back_a(self.context.path) ]
+ >> relpath | abspath
+ ;
+
+ relpath
+ = ( word [ push_back_a(self.context.path) ]
% ch_p('/') )
>> ( ! ch_p('/') [ push_back_a(self.context.path,"") ] )
;
+ abspath
+ = ch_p('/') [ push_back_a(self.context.path, "") ]
+ >> ( relpath
+ | eps_p [ push_back_a(self.context.path, "") ] )
+ ;
+
balanced_tokens
= ch_p('(') [ self.dispatch(&PD::pushPunctuation, "(") ]
>> * token
= space_p | comment_p('#')
;
+ ///////////////////////////////////////////////////////////////////
+
+ start_parsers(
+ commands, // CommandParser
+ skip // SkipParser
+ );
+
BOOST_SPIRIT_DEBUG_TRACE_RULE(command,1);
BOOST_SPIRIT_DEBUG_TRACE_RULE(path,1);
BOOST_SPIRIT_DEBUG_TRACE_RULE(argument,1);
BOOST_SPIRIT_DEBUG_TRACE_RULE(simple_argument,1);
BOOST_SPIRIT_DEBUG_TRACE_RULE(complex_argument,1);
BOOST_SPIRIT_DEBUG_TRACE_RULE(builtin,1);
-
- start_parsers(
- commands, // CommandParser
- skip // SkipParser
- );
-
+ BOOST_SPIRIT_DEBUG_TRACE_RULE(commands,1);
+ BOOST_SPIRIT_DEBUG_TRACE_RULE(block,1);
+ BOOST_SPIRIT_DEBUG_TRACE_RULE(statement,1);
+ BOOST_SPIRIT_DEBUG_TRACE_RULE(relpath,1);
+ BOOST_SPIRIT_DEBUG_TRACE_RULE(abspath,1);
}
};
};
+
+
+#endif
+
}}}
///////////////////////////////ih.e////////////////////////////////////////
projects / senf.git / blobdiff