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Diffstat (limited to 'indra/llmath/llcalcparser.h')
| -rw-r--r-- | indra/llmath/llcalcparser.h | 174 |
1 files changed, 174 insertions, 0 deletions
diff --git a/indra/llmath/llcalcparser.h b/indra/llmath/llcalcparser.h new file mode 100644 index 0000000000..600e173661 --- /dev/null +++ b/indra/llmath/llcalcparser.h @@ -0,0 +1,174 @@ +/* + * 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/include/classic_attribute.hpp> +#include <boost/spirit/include/classic_core.hpp> +#include <boost/spirit/include/classic_error_handling.hpp> +#include <boost/spirit/include/classic_position_iterator.hpp> +#include <boost/spirit/include/phoenix1_binders.hpp> +#include <boost/spirit/include/classic_symbols.hpp> +using namespace boost::spirit::classic; + +#include "llcalc.h" +#include "llmath.h" + +struct LLCalcParser : grammar<LLCalcParser> +{ + LLCalcParser(F32& result, LLCalc::calc_map_t* constants, LLCalc::calc_map_t* vars) : + mResult(result), mConstants(constants), mVariables(vars) {}; + + struct value_closure : closure<value_closure, F32> + { + member1 value; + }; + + template <typename ScannerT> + struct definition + { + // Rule declarations + rule<ScannerT> statement, identifier; + rule<ScannerT, value_closure::context_t> expression, term, + power, + unary_expr, + factor, + unary_func, + binary_func, + group; + + // start() should return the starting symbol + rule<ScannerT> const& start() const { return statement; } + + definition(LLCalcParser const& self) + { + 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(&LLCalcParser::_sin)(self,arg1)]) | + (str_p("COS") >> '(' >> expression[unary_func.value = bind(&LLCalcParser::_cos)(self,arg1)]) | + (str_p("TAN") >> '(' >> expression[unary_func.value = bind(&LLCalcParser::_tan)(self,arg1)]) | + (str_p("ASIN") >> '(' >> expression[unary_func.value = bind(&LLCalcParser::_asin)(self,arg1)]) | + (str_p("ACOS") >> '(' >> expression[unary_func.value = bind(&LLCalcParser::_acos)(self,arg1)]) | + (str_p("ATAN") >> '(' >> expression[unary_func.value = bind(&LLCalcParser::_atan)(self,arg1)]) | + (str_p("SQRT") >> '(' >> expression[unary_func.value = bind(&LLCalcParser::_sqrt)(self,arg1)]) | + (str_p("LOG") >> '(' >> expression[unary_func.value = bind(&LLCalcParser::_log)(self,arg1)]) | + (str_p("EXP") >> '(' >> expression[unary_func.value = bind(&LLCalcParser::_exp)(self,arg1)]) | + (str_p("ABS") >> '(' >> expression[unary_func.value = bind(&LLCalcParser::_fabs)(self,arg1)]) | + (str_p("FLR") >> '(' >> expression[unary_func.value = bind(&LLCalcParser::_floor)(self,arg1)]) | + (str_p("CEIL") >> '(' >> expression[unary_func.value = bind(&LLCalcParser::_ceil)(self,arg1)]) + ) >> assert_syntax(ch_p(')')) + ; + + binary_func = + ((str_p("ATAN2") >> '(' >> expression[binary_func.value = arg1] >> ',' >> + expression[binary_func.value = bind(&LLCalcParser::_atan2)(self, binary_func.value, arg1)]) | + (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])) | + ('%' >> assert_syntax(power[term.value = bind(&fmodf)(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); } + + //FIX* non ambigious function fix making SIN() work for calc -Cryogenic Blitz + F32 _sin(const F32& a) const { return sin(DEG_TO_RAD * a); } + F32 _cos(const F32& a) const { return cos(DEG_TO_RAD * a); } + F32 _tan(const F32& a) const { return tan(DEG_TO_RAD * a); } + F32 _asin(const F32& a) const { return asin(a * RAD_TO_DEG); } + F32 _acos(const F32& a) const { return acos(a * RAD_TO_DEG); } + F32 _atan(const F32& a) const { return atan(a * RAD_TO_DEG); } + F32 _sqrt(const F32& a) const { return sqrt(a); } + F32 _log(const F32& a) const { return log(a); } + F32 _exp(const F32& a) const { return exp(a); } + F32 _fabs(const F32& a) const { return fabs(a); } + F32 _floor(const F32& a) const { return llfloor(a); } + F32 _ceil(const F32& a) const { return llceil(a); } + + F32 _atan2(const F32& a,const F32& b) const { return atan2(a,b); } + + + + LLCalc::calc_map_t* mConstants; + LLCalc::calc_map_t* mVariables; +// LLCalc::calc_map_t* mUserVariables; + + F32& mResult; +}; + +#endif // LL_CALCPARSER_H |