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#ifndef _INCLUDED_RULEVALUE_
#define _INCLUDED_RULEVALUE_
#include <vector>
#include <iosfwd>
class RuleValue
{
public:
using Args = std::vector<RuleValue>;
struct Function
{
enum Type
{
DOUBLE_IN_DOUBLE_OUT,
DOUBLE_IN_RAD_OUT, // fun expects double, returns radians
RAD_IN_DOUBLE_OUT, // fun expects radians, returns double
};
union Ptr
{
double (*unary)(double);
double (*binary)(double, double);
};
Type d_type;
Ptr d_ptr;
size_t d_arity;
Function(double (*)(double), Type t = DOUBLE_IN_DOUBLE_OUT);
Function(double (*)(double, double));
size_t arity() const;
double (*unary() const)(double);
double (*binary() const)(double, double);
double value() const;
Type type() const;
};
private:
union ValueUnion
{
char c;
int i;
double d;
size_t s;
Function const *f;
Args *args;
};
static char const *s_tagName[];
public:
enum ValueTag // modify data.cc if this changes
{
ERROR, // something failed.
CHAR,
INT,
DOUBLE,
VARIABLE,
FUNCTION,
ARG_VECTOR,
};
private:
ValueTag d_tag;
ValueUnion d_value;
public:
RuleValue();
RuleValue(char c);
RuleValue(int i);
RuleValue(double d);
RuleValue(unsigned idx);
RuleValue(Function const &funRef);
RuleValue(Args *args);
RuleValue(char const *ident);
RuleValue(RuleValue const &other);
~RuleValue();
ValueTag tag() const;
char const *tagName() const;
char asChar() const;
int asInt() const;
double asDouble() const;
Function const &fun() const;
size_t varIdx() const;
RuleValue operator-() const;
RuleValue operator~() const;
RuleValue &operator=(RuleValue const &other);
RuleValue &operator+=(RuleValue const &other);
RuleValue &operator-=(RuleValue const &other);
RuleValue &operator*=(RuleValue const &other);
RuleValue &operator/=(RuleValue const &other);
RuleValue &operator%=(RuleValue const &other);
RuleValue &operator&=(RuleValue const &other);
RuleValue &operator^=(RuleValue const &other);
RuleValue &operator|=(RuleValue const &other);
RuleValue &operator<<=(RuleValue const &other);
RuleValue &operator>>=(RuleValue const &other);
RuleValue const &operator[](size_t idx) const;
size_t size() const;
RuleValue &push_arg(RuleValue const &other);
private:
void destroy();
void copy(RuleValue const &other);
};
inline RuleValue::RuleValue(RuleValue const &other)
{
copy(other);
}
inline RuleValue::~RuleValue()
{
destroy();
}
inline void RuleValue::destroy()
{
if (d_tag == ARG_VECTOR)
delete d_value.args;
}
inline RuleValue const &RuleValue::operator[](size_t idx) const
{
return (*d_value.args)[idx];
}
inline RuleValue RuleValue::operator~() const
{
return RuleValue(~asInt());
}
inline RuleValue::ValueTag RuleValue::tag() const
{
return d_tag;
}
inline char const *RuleValue::tagName() const
{
return s_tagName[d_tag];
}
inline size_t RuleValue::size() const
{
return d_value.args->size();
}
inline size_t RuleValue::Function::arity() const
{
return d_arity;
}
inline RuleValue::Function::Type RuleValue::Function::type() const
{
return d_type;
}
inline double (*RuleValue::Function::unary() const)(double)
{
return d_ptr.unary;
}
inline double (*RuleValue::Function::binary() const)(double, double)
{
return d_ptr.binary;
}
inline RuleValue &RuleValue::push_arg(RuleValue const &value)
{
d_value.args->push_back(value);
return *this;
}
inline size_t RuleValue::varIdx() const
{
return d_value.s;
}
namespace std
{
ostream &operator<<(ostream &out, RuleValue const &t);
}
#endif
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