webdice/expression.h

#ifndef WEBDICE_EXPRESSION
#define WEBDICE_EXPRESSION

#include <stdint.h>

enum expression_type{
	WEBDICE_CONST,
	WEBDICE_ROLL,
	WEBDICE_BINARY
};

enum binary_type{
	WEBDICE_MUL,
	WEBDICE_DIV,
	WEBDICE_ADD,
	WEBDICE_SUB
};

struct expression_id{
	enum expression_type id;
};

struct expression_const{
	enum expression_type id;
	int64_t value;
};

struct expression_roll{
	enum expression_type id;
	int64_t count;
	int64_t type;
};

struct expression_binary{
	enum expression_type id;
	enum binary_type operation;
	union expression* left;
	union expression* right;
};

union expression{
	struct expression_id id;
	struct expression_const constant;
	struct expression_roll roll;
	struct expression_binary binary;
};

struct expression_result{
	char* text;
	long double min;
	long double max;
	long double expected;
	long double actual;
};

union expression* webdice_const(int64_t value);
union expression* webdice_roll(int64_t count, int64_t roll);

union expression* webdice_mul(union expression* left, union expression* right);
union expression* webdice_div(union expression* left, union expression* right);
union expression* webdice_add(union expression* left, union expression* right);
union expression* webdice_sub(union expression* left, union expression* right);

union expression* webdice_binary(enum binary_type type, union expression* left, union expression* right);

struct expression_result resolve(union expression* root);

void free_expression(union expression* root);

#endif