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/*
* LLCalcParser.h
* SecondLife
*
* Created by Aimee Walton on 28/09/2008.
* Copyright 2008 Aimee Walton.
*
*/
#ifndef LL_CALCPARSER_H
#define LL_CALCPARSER_H
#include <boost/spirit/attribute.hpp>
#include <boost/spirit/core.hpp>
#include <boost/spirit/error_handling.hpp>
#include <boost/spirit/iterator/position_iterator.hpp>
#include <boost/spirit/phoenix/binders.hpp>
//#include <boost/spirit/symbols/symbols.hpp>
#include <map>
#include <string>
#include "llcalc.h"
#include "llmath.h"
struct LLCalcParser : boost::spirit::grammar<LLCalcParser>
{
LLCalcParser(F32& result, LLCalc::calc_map_t* constants, LLCalc::calc_map_t* vars) :
mResult(result), mConstants(constants), mVariables(vars) {};
struct value_closure : boost::spirit::closure<value_closure, F32>
{
member1 value;
};
template <typename ScannerT>
struct definition
{
// Rule declarations
boost::spirit::rule<ScannerT> statement, identifier;
boost::spirit::rule<ScannerT, value_closure::context_t> expression, term,
power,
unary_expr,
factor,
/*unary_func,
/binary_func,*/
group;
// start() should return the starting symbol
boost::spirit::rule<ScannerT> const& start() const { return statement; }
definition(LLCalcParser const& self)
{
using namespace boost::spirit;
using namespace phoenix;
assertion<std::string> assert_domain("Domain error");
// assertion<std::string> assert_symbol("Unknown symbol");
assertion<std::string> assert_syntax("Syntax error");
identifier =
lexeme_d[(alpha_p | '_') >> *(alnum_p | '_')]
;
group =
'(' >> expression[group.value = arg1] >> assert_syntax(ch_p(')'))
;
/*unary_func =
((str_p("SIN") >> '(' >> expression[unary_func.value = bind(&sin)(DEG_TO_RAD * arg1)]) |
(str_p("COS") >> '(' >> expression[unary_func.value = bind(&cos)(DEG_TO_RAD * arg1)]) |
(str_p("TAN") >> '(' >> expression[unary_func.value = bind(&tan)(DEG_TO_RAD * arg1)]) |
(str_p("ASIN") >> '(' >> expression[unary_func.value = (bind(&asin)(arg1)) * RAD_TO_DEG]) |
(str_p("ACOS") >> '(' >> expression[unary_func.value = bind(&acos)(arg1) * RAD_TO_DEG]) |
(str_p("ATAN") >> '(' >> expression[unary_func.value = bind(&atan)(arg1) * RAD_TO_DEG]) |
(str_p("SQRT") >> '(' >> expression[unary_func.value = bind(&sqrt)(arg1)]) |
(str_p("LOG") >> '(' >> expression[unary_func.value = bind(&log)(arg1)]) |
(str_p("EXP") >> '(' >> expression[unary_func.value = bind(&exp)(arg1)]) |
(str_p("ABS") >> '(' >> expression[unary_func.value = bind(&fabs)(arg1)])
) >> assert_syntax(ch_p(')'))
;
binary_func =
((str_p("ATAN2") >> '(' >> expression[binary_func.value = arg1] >> ',' >>
expression[binary_func.value = bind(&atan2)(binary_func.value, arg1) * RAD_TO_DEG]) |
(str_p("MIN") >> '(' >> expression[binary_func.value = arg1] >> ',' >>
expression[binary_func.value = bind(&LLCalcParser::min)(self, binary_func.value, arg1)]) |
(str_p("MAX") >> '(' >> expression[binary_func.value = arg1] >> ',' >>
expression[binary_func.value = bind(&LLCalcParser::max)(self, binary_func.value, arg1)])
) >> assert_syntax(ch_p(')'))
;*/
// *TODO: Localisation of the decimal point?
// Problem, LLLineEditor::postvalidateFloat accepts a comma when appropriate
// for the current locale. However to do that here could clash with using
// the comma as a separator when passing arguments to functions.
factor =
(ureal_p[factor.value = arg1] |
group[factor.value = arg1] |
/*unary_func[factor.value = arg1] |
binary_func[factor.value = arg1] |*/
// Lookup throws an Unknown Symbol error if it is unknown, while this works fine,
// would be "neater" to handle symbol lookup from here with an assertive parser.
// constants_p[factor.value = arg1]|
identifier[factor.value = bind(&LLCalcParser::lookup)(self, arg1, arg2)]
) >>
// Detect and throw math errors.
assert_domain(eps_p(bind(&LLCalcParser::checkNaN)(self, factor.value)))
;
unary_expr =
!ch_p('+') >> factor[unary_expr.value = arg1] |
'-' >> factor[unary_expr.value = -arg1]
;
power =
unary_expr[power.value = arg1] >>
*('^' >> assert_syntax(unary_expr[power.value = bind(&powf)(power.value, arg1)]))
;
term =
power[term.value = arg1] >>
*(('*' >> assert_syntax(power[term.value *= arg1])) |
('/' >> assert_syntax(power[term.value /= arg1]))
)
;
expression =
assert_syntax(term[expression.value = arg1]) >>
*(('+' >> assert_syntax(term[expression.value += arg1])) |
('-' >> assert_syntax(term[expression.value -= arg1]))
)
;
statement =
!ch_p('=') >> ( expression )[var(self.mResult) = arg1] >> (end_p)
;
}
};
private:
// Member functions for semantic actions
F32 lookup(const std::string::iterator&, const std::string::iterator&) const;
F32 min(const F32& a, const F32& b) const { return llmin(a, b); }
F32 max(const F32& a, const F32& b) const { return llmax(a, b); }
bool checkNaN(const F32& a) const { return !llisnan(a); }
LLCalc::calc_map_t* mConstants;
LLCalc::calc_map_t* mVariables;
// LLCalc::calc_map_t* mUserVariables;
F32& mResult;
};
#endif // LL_CALCPARSER_H
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