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lua_grammar.hpp
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#ifndef _LUA_GRAMMAR_HPP_INCLUDED_SOD8FU3498USFDLKJSFDLKJ4OUISDFLKJSLFKJASODIUJ4OIUJSFDKLJOIJSFDLKJSLKJDOFIJ4OIEWOIDKDKDF
#define _LUA_GRAMMAR_HPP_INCLUDED_SOD8FU3498USFDLKJSFDLKJ4OUISDFLKJSLFKJASODIUJ4OIUJSFDKLJOIJSFDLKJSLKJDOFIJ4OIEWOIDKDKDF
#define BOOST_SPIRIT_DEBUG
#include <boost/bind.hpp>
#include <boost/spirit/include/classic.hpp>
#include <iostream>
#include <stdexcept>
/* Lua 5.0 BNF:
This BNF is extracted from http://www.lua.org/manual/5.0/manual.html#BNF
<bnf>
chunk ::= {stat [';']}
block ::= chunk
stat ::= varlist1 '=' explist1 |
functioncall |
do block end |
while exp do block end |
repeat block until exp |
if exp then block {elseif exp then block} [else block] end |
return [explist1] |
break |
for Name '=' exp ',' exp [',' exp] do block end |
for Name {',' Name} in explist1 do block end |
function funcname funcbody |
local function Name funcbody |
local namelist [init]
funcname ::= Name {'.' Name} [':' Name]
varlist1 ::= var {',' var}
var ::= Name | prefixexp '[' exp ']' | prefixexp '.' Name
namelist ::= Name {',' Name}
init ::= '=' explist1
explist1 ::= {exp ','} exp
exp ::= nil false true | Number | Literal | function | prefixexp | tableconstructor | exp binop exp | unop exp
prefixexp ::= var | functioncall | '(' exp ')'
functioncall ::= prefixexp args | prefixexp ':' Name args
args ::= '(' [explist1] ')' | tableconstructor | Literal
function ::= function funcbody
funcbody ::= '(' [parlist1] ')' block end
parlist1 ::= Name {',' Name} [',' '...'] | '...'
tableconstructor ::= '{' [fieldlist] '}'
fieldlist ::= field {fieldsep field} [fieldsep]
field ::= '[' exp ']' '=' exp | name '=' exp | exp
fieldsep ::= ',' | ';'
binop ::= '+' | '-' | '*' | '/' | '^' | '..' | '<' | '<=' | '>' | '>=' | '==' | '~=' | and | or
unop ::= '-' | not
</bnf>
As one can see, there are some left recursion in this bnf: prefixexp, var, functioncall, exp.
I had to add several new 'specialized' rules to avoid this.
*/
#if 0
Lua 5.1 BNF:
chunk ::= block
block ::= {stat} [laststat [¡®;¡¯]]
stat ::= ¡®;¡¯ |
varlist ¡®=¡¯ explist |
functioncall |
do block end |
while exp do block end |
repeat block until exp |
if exp then block {elseif exp then block} [else block] end |
for Name ¡®=¡¯ exp ¡®,¡¯ exp [¡®,¡¯ exp] do block end |
for namelist in explist do block end |
function funcname funcbody |
local function Name funcbody |
local namelist [¡®=¡¯ explist]
laststat ::= return [explist] | break
funcname ::= Name {¡®.¡¯ Name} [¡®:¡¯ Name]
varlist ::= var {¡®,¡¯ var}
var ::= Name | prefixexp ¡®[¡¯ exp ¡®]¡¯ | prefixexp ¡®.¡¯ Name
namelist ::= Name {¡®,¡¯ Name}
explist ::= {exp ¡®,¡¯} exp
exp ::= nil | false | true | Number | String | ¡®...¡¯ | function |
prefixexp | tableconstructor | exp binop exp | unop exp
prefixexp ::= var | functioncall | ¡®(¡¯ exp ¡®)¡¯
functioncall ::= prefixexp args | prefixexp ¡®:¡¯ Name args
args ::= ¡®(¡¯ [explist] ¡®)¡¯ | tableconstructor | String
function ::= function funcbody
funcbody ::= ¡®(¡¯ [parlist] ¡®)¡¯ block end
parlist ::= namelist [¡®,¡¯ ¡®...¡¯] | ¡®...¡¯
tableconstructor ::= ¡®{¡¯ [fieldlist] ¡®}¡¯
fieldlist ::= field {fieldsep field} [fieldsep]
field ::= ¡®[¡¯ exp ¡®]¡¯ ¡®=¡¯ exp | Name ¡®=¡¯ exp | exp
fieldsep ::= ¡®,¡¯ | ¡®;¡¯
binop ::= ¡®+¡¯ | ¡®-¡¯ | ¡®*¡¯ | ¡®/¡¯ | ¡®^¡¯ | ¡®%¡¯ | ¡®..¡¯ |
¡®<¡¯ | ¡®<=¡¯ | ¡®>¡¯ | ¡®>=¡¯ | ¡®==¡¯ | ¡®~=¡¯ |
and | or
unop ::= ¡®-¡¯ | not | ¡®#¡¯
#endif
namespace lua
{
///
/// binary operator symbol table
///
template<typename CharT>
struct binop_symbols :
boost::spirit::classic::symbols<std::string, CharT>
{
binop_symbols()
{
boost::spirit::classic::symbols<std::string, CharT> ::
add
( "+" , "+" )
( "-" , "-" )
( "*" , "*" )
( "/" , "/" )
( "^" , "^" )
( ".." , ".." )
( "<" , "<" )
( "<=" , "<=" )
( ">" , ">" )
( ">=" , ">=" )
( "==" , "==" )
( "~=" , "~=" )
( "and" , "and" )
( "or" , "or" )
;
}
};
const binop_symbols<char> binop_symbols_p = binop_symbols<char>();
///
/// unary operator symbol table
///
template<typename CharT>
struct unop_symbols : boost::spirit::classic::symbols<std::string, CharT>
{
unop_symbols()
{
boost::spirit::classic::symbols<std::string, CharT> ::
add
( "-" , "-" )
( "not" , "not" )
;
}
};
const unop_symbols<char> unop_symbols_p = unop_symbols<char>();
///
/// boolean symbols
///
template<typename CharT>
struct boolean_symbols : boost::spirit::classic::symbols<std::string, CharT>
{
boolean_symbols()
{
boost::spirit::classic::symbols<std::string, CharT> ::
add
( "nil" , "nil" )
( "false" , "false" )
( "true" , "true" )
;
}
};
const boolean_symbols<char> boolean_symbols_p = boolean_symbols<char>();
///
/// literal grammar
///
struct literal_grammar : boost::spirit::classic::grammar< literal_grammar >
{
template <typename ScannerT>
struct definition
{
boost::spirit::classic::rule<ScannerT>
escaped_literal,
literal_double_bracket,
literal_apos,
literal_quot,
literal;
definition( literal_grammar const& self_ )
{
using namespace boost::spirit::classic;
escaped_literal =
ch_p( '\\' ) >> chset_p( "abfnrtv\\\"\'[]" )
| anychar_p
;
literal_double_bracket = comment_p( "[[", "]]" );
literal_apos = confix_p( '\'', *escaped_literal, '\'' );
literal_quot = confix_p( '\"', *escaped_literal, '\"' );
literal =
literal_double_bracket
| literal_apos
| literal_quot
;
BOOST_SPIRIT_DEBUG_NODE( escaped_literal );
BOOST_SPIRIT_DEBUG_NODE( literal_double_bracket );
BOOST_SPIRIT_DEBUG_NODE( literal_apos );
BOOST_SPIRIT_DEBUG_NODE( literal_quot );
BOOST_SPIRIT_DEBUG_NODE( literal );
};
boost::spirit::classic::rule<ScannerT> const& start() const { return literal; }
};
};
const literal_grammar literal_grammar_p = literal_grammar();
///
/// name grammar
///
struct name_grammar : boost::spirit::classic::grammar< name_grammar >
{
template <typename ScannerT>
struct definition
{
boost::spirit::classic::rule<ScannerT>
name;
definition( name_grammar const& self_ )
{
using namespace boost::spirit::classic;
name = lexeme_d[ alpha_p >> *( alnum_p | ch_p( '_' ) ) ];
BOOST_SPIRIT_DEBUG_NODE( name );
};
boost::spirit::classic::rule<ScannerT> const& start() const { return name; }
};
};
const name_grammar name_grammar_p = name_grammar();
///
/// the lua grammar
///
class lua_grammar :
public boost::spirit::classic::grammar< lua_grammar >
{
public:
template <typename ScannerT>
struct definition
{
definition( lua_grammar const& self_ )
{
using namespace boost::spirit::classic;
Name = name_grammar_p;
Literal = literal_grammar_p;
comment = comment_p( "--" );
fieldsep = chset_p( ",;" );
field =
(
(
confix_p( ch_p( '[' ), exp, ch_p( ']' ) )
>> ch_p( '=' )
>> exp
)
| ( Name >> ch_p( '=' ) >> exp )
| exp
);
fieldlist =
(
list_p( field, fieldsep ) >> !fieldsep
);
tableconstructor =
(
( ch_p( '{' ) >> ch_p( '}' ) )
| confix_p( ch_p( '{' ), fieldlist, ch_p( '}' ) )
);
funcname =
list_p( Name, ch_p( '.' ) )
>> !(
ch_p( ':' )
>> Name
);
parlist1 =
list_p( Name, ch_p( ',' ) )
>> !(
( ch_p( ',' ) >> str_p( "..." ) )
| str_p( "..." )
);
funcbody =
( confix_p( ch_p( '(' ), !parlist1, ch_p( ')' ) )
>> block
>> str_p( "end" )
);
function =
(
str_p( "function" ) >> funcbody
);
args =
(
ch_p( '(' ) >> ch_p( ')' )
| confix_p( ch_p( '(' ) , explist1, ch_p( ')' ) )
| tableconstructor
| Literal
);
functioncallexp =
args
| ( ch_p( ':' ) >> Name >> args );
functioncall =
(
prefixexp_func >> functioncallexp
);
varexp =
confix_p( ch_p( '[' ), exp, ch_p( ']' ) )
| ch_p( '.' ) >> Name;
var =
(
Name
| ( prefixexp_var >> varexp )
);
prefixexp_func =
Name
>>
*( !functioncallexp >>
(
varexp
| confix_p( ch_p( '(' ), exp, ch_p( ')' ) )
)
)
;
prefixexp_var =
Name
>>
*( ! varexp >>
(
functioncallexp
| confix_p( ch_p( '(' ), exp, ch_p( ')' ) )
)
)
;
prefixexp =
Name
>>
*( varexp
| functioncallexp
| confix_p( ch_p( '(' ), exp, ch_p( ')' ) )
)
;
varlist1 =
(
list_p( var, ch_p( ',' ) )
);
do_loop =
(
str_p( "do" ) >> block >> str_p( "end" )
);
while_loop =
(
str_p( "while" ) >> exp >> str_p( "do" ) >> block >> str_p( "end" )
);
repeat_loop =
(
str_p( "repeat" ) >> block >> str_p( "until" ) >> exp
);
if_loop =
(
str_p( "if" ) >> exp >> str_p( "then" ) >> block
>> *( str_p( "elseif" ) >> exp >> str_p( "then" ) >> block )
>> !( str_p( "else" ) >> block )
>> str_p( "end" )
);
return_ =
(
str_p( "return" ) >> !explist1
);
for_loop =
(
str_p( "for" ) >> Name >> ch_p( '=' ) >> exp
>> ch_p( ',' ) >> exp
>> !( ch_p( ',' ) >> exp )
>> str_p( "do" ) >> block >> str_p( "end" )
);
for_loop_in =
(
str_p( "for" ) >> list_p( Name, ch_p( ',' ) )
>> str_p( "in" ) >> explist1
>> str_p( "do" ) >> block >> str_p( "end" )
);
local_function =
(
str_p( "local" ) >> str_p( "function" ) >> Name >> funcbody
);
local_namelist =
(
str_p( "local" ) >> namelist >> !init
);
function_full =
(
str_p( "function" ) >> funcname >> funcbody
);
namelist =
(
list_p( Name, ch_p( ',' ) )
);
explist1 =
(
exp
>> !(
ch_p( ',' )
>> list_p( exp, ',' )
)
);
init = ch_p( '=' ) >> explist1;
stat =
(
ch_p( ';' )
| ( varlist1 >> ch_p( '=' ) >> explist1 )
| functioncall
| do_loop
| while_loop
| repeat_loop
| if_loop
| return_
| str_p( "break" )
| for_loop
| for_loop_in
| function_full
| local_function
| local_namelist
| comment
);
;
chunk =
(
*( stat >> !ch_p( ';' ) )
);
block =
(
chunk
);
exp_inner =
boolean
| real_p
| Literal
| function
| tableconstructor
| ( unop >> exp )
| prefixexp;
exp =
(
exp_inner >> *( binop >> exp )
| unop >> exp
);
BOOST_SPIRIT_DEBUG_NODE( binop );
BOOST_SPIRIT_DEBUG_NODE( unop );
BOOST_SPIRIT_DEBUG_NODE( boolean );
BOOST_SPIRIT_DEBUG_NODE( chunk );
BOOST_SPIRIT_DEBUG_NODE( block );
BOOST_SPIRIT_DEBUG_NODE( stat );
BOOST_SPIRIT_DEBUG_NODE( funcname );
BOOST_SPIRIT_DEBUG_NODE( varlist1 );
BOOST_SPIRIT_DEBUG_NODE( var );
BOOST_SPIRIT_DEBUG_NODE( varexp );
BOOST_SPIRIT_DEBUG_NODE( namelist );
BOOST_SPIRIT_DEBUG_NODE( init );
BOOST_SPIRIT_DEBUG_NODE( explist1 );
BOOST_SPIRIT_DEBUG_NODE( exp );
BOOST_SPIRIT_DEBUG_NODE( exp_inner );
BOOST_SPIRIT_DEBUG_NODE( prefixexp );
BOOST_SPIRIT_DEBUG_NODE( prefixexp_func );
BOOST_SPIRIT_DEBUG_NODE( prefixexp_var );
BOOST_SPIRIT_DEBUG_NODE( functioncall );
BOOST_SPIRIT_DEBUG_NODE( functioncallexp );
BOOST_SPIRIT_DEBUG_NODE( args );
BOOST_SPIRIT_DEBUG_NODE( function );
BOOST_SPIRIT_DEBUG_NODE( funcbody );
BOOST_SPIRIT_DEBUG_NODE( parlist1 );
BOOST_SPIRIT_DEBUG_NODE( tableconstructor );
BOOST_SPIRIT_DEBUG_NODE( fieldlist );
BOOST_SPIRIT_DEBUG_NODE( field );
BOOST_SPIRIT_DEBUG_NODE( fieldsep );
BOOST_SPIRIT_DEBUG_NODE( do_loop );
BOOST_SPIRIT_DEBUG_NODE( while_loop );
BOOST_SPIRIT_DEBUG_NODE( repeat_loop );
BOOST_SPIRIT_DEBUG_NODE( if_loop );
BOOST_SPIRIT_DEBUG_NODE( return_ );
BOOST_SPIRIT_DEBUG_NODE( for_loop );
BOOST_SPIRIT_DEBUG_NODE( for_loop_in );
BOOST_SPIRIT_DEBUG_NODE( local_function );
BOOST_SPIRIT_DEBUG_NODE( local_namelist );
BOOST_SPIRIT_DEBUG_NODE( function_full );
BOOST_SPIRIT_DEBUG_NODE( comment );
BOOST_SPIRIT_DEBUG_NODE( Name );
BOOST_SPIRIT_DEBUG_NODE( real_p );
BOOST_SPIRIT_DEBUG_NODE( Literal );
};
boost::spirit::classic::rule<ScannerT> const& start() const { return chunk; }
binop_symbols<char> binop;
unop_symbols<char> unop;
boolean_symbols<char> boolean;
boost::spirit::classic::rule<ScannerT>
Name,
Literal,
chunk,
block,
stat,
funcname,
varlist1,
prefvar,
var,
varexp,
namelist,
init,
explist1,
exp_inner,
exp,
prefixexp,
prefixexp_func,
prefixexp_var,
functioncall,
functioncallexp,
args,
function,
funcbody,
parlist1,
tableconstructor,
fieldlist,
field,
fieldsep,
do_loop,
while_loop,
repeat_loop,
if_loop,
return_,
for_loop,
for_loop_in,
local_function,
local_namelist,
function_full,
comment,
//!!new!!
varlist,
explist,
laststat
;
};
};
///
/// a small test function...
/// returns a "home made" parse_info to avoid including spirit headers
///
my_parse_info test_lua_grammar( std::string const& file_name_ )
{
using namespace boost::spirit::classic;
file_iterator<> first( file_name_.c_str() );
if ( !first )
{ throw std::invalid_argument( std::string( "could not open file" ) ); }
file_iterator<> last = first.make_end();
typedef char char_t;
typedef file_iterator <char_t> iterator_t;
lua_grammar lua_rule;
parse_info<iterator_t> info = parse( first, last, lua_rule, space_p );
my_parse_info pi;
pi.hit = info.hit;
pi.full = info.full;
pi.length = info.length;
return pi;
};
};
#endif//_LUA_GRAMMAR_HPP_INCLUDED_SOD8FU3498USFDLKJSFDLKJ4OUISDFLKJSLFKJASODIUJ4OIUJSFDKLJOIJSFDLKJSLKJDOFIJ4OIEWOIDKDKDF