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#ifndef __EXPRESSIONS_H
#define __EXPRESSIONS_H
#include <glib.h>
#include "undo.h"
template <typename Type>
class ValueStack {
int size;
Type *stack;
Type *top;
public:
ValueStack(int _size = 1024) : size(_size)
{
top = stack = new Type[size];
}
~ValueStack()
{
delete stack;
}
inline int
items(void)
{
return (top - stack)/sizeof(Type);
}
inline Type &
push(Type value, int index = 1)
{
for (int i = -index + 1; i; i++)
top[i+1] = top[i];
top++;
return peek(index) = value;
}
inline Type
pop(int index = 1)
{
Type v = peek(index);
top--;
while (--index)
top[-index] = top[-index + 1];
return v;
}
inline Type &
peek(int index = 1)
{
return top[-index];
}
};
template <typename Type>
class UndoTokenPush : public UndoToken {
ValueStack<Type> *stack;
Type value;
int index;
public:
UndoTokenPush(ValueStack<Type> &_stack, Type _value, int _index = 1)
: stack(&_stack), value(_value), index(_index) {}
void
run(void)
{
stack->push(value, index);
}
};
template <typename Type>
class UndoTokenPop : public UndoToken {
ValueStack<Type> *stack;
int index;
public:
UndoTokenPop(ValueStack<Type> &_stack, int _index = 1)
: stack(&_stack), index(_index) {}
void
run(void)
{
stack->pop(index);
}
};
/*
* Arithmetic expression stacks
*/
extern class Expressions {
/* reflects also operator precedence */
enum Operator {
OP_NIL = 0,
OP_POW, // ^*
OP_MUL, // *
OP_DIV, // /
OP_MOD, // ^/
OP_ADD, // +
OP_SUB, // -
OP_AND, // &
OP_OR, // #
// pseudo operators:
OP_BRACE,
OP_LOOP,
OP_NUMBER
};
ValueStack<gint64> numbers;
ValueStack<Operator> operators;
gint num_sign;
gint radix;
public:
Expressions() : num_sign(1), radix(10) {}
void set_num_sign(gint sign);
void set_radix(gint r);
gint64 push(gint64 number);
gint64 pop_num(int index = 1);
gint64 pop_num_calc(int index, gint64 imply);
inline gint64
pop_num_calc(int index = 1)
{
return pop_num_calc(index, num_sign);
}
gint64 add_digit(gchar digit);
Operator push(Operator op);
Operator push_calc(Operator op);
Operator pop_op(int index = 1);
void calc(void);
void eval(bool pop_brace = false);
int args(void);
inline int
first_op(void)
{
return args() + 1;
}
void discard_args(void);
} expressions;
#endif
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