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/*
* This module provides functions for working with arbitrary-sized integers.
*/
#ifndef PRISM_INTERNAL_INTEGER_H
#define PRISM_INTERNAL_INTEGER_H
#include "prism/buffer.h"
#include "prism/integer.h"
#include <stdint.h>
/*
* An enum controlling the base of an integer. It is expected that the base is
* already known before parsing the integer, even though it could be derived
* from the string itself.
*/
typedef enum {
/* The default decimal base, with no prefix. Leading 0s will be ignored. */
PM_INTEGER_BASE_DEFAULT,
/* The binary base, indicated by a 0b or 0B prefix. */
PM_INTEGER_BASE_BINARY,
/* The octal base, indicated by a 0, 0o, or 0O prefix. */
PM_INTEGER_BASE_OCTAL,
/* The decimal base, indicated by a 0d, 0D, or empty prefix. */
PM_INTEGER_BASE_DECIMAL,
/* The hexadecimal base, indicated by a 0x or 0X prefix. */
PM_INTEGER_BASE_HEXADECIMAL,
/*
* An unknown base, in which case pm_integer_parse will derive it based on
* the content of the string. This is less efficient and does more
* comparisons, so if callers know the base ahead of time, they should use
* that instead.
*/
PM_INTEGER_BASE_UNKNOWN
} pm_integer_base_t;
/*
* Parse an integer from a string. This assumes that the format of the integer
* has already been validated, as internal validation checks are not performed
* here.
*/
void pm_integer_parse(pm_integer_t *integer, pm_integer_base_t base, const uint8_t *start, const uint8_t *end);
/*
* Compare two integers. This function returns -1 if the left integer is less
* than the right integer, 0 if they are equal, and 1 if the left integer is
* greater than the right integer.
*/
int pm_integer_compare(const pm_integer_t *left, const pm_integer_t *right);
/*
* Reduce a ratio of integers to its simplest form.
*
* If either the numerator or denominator do not fit into a 32-bit integer, then
* this function is a no-op. In the future, we may consider reducing even the
* larger numbers, but for now we're going to keep it simple.
*/
void pm_integers_reduce(pm_integer_t *numerator, pm_integer_t *denominator);
/* Convert an integer to a decimal string. */
void pm_integer_string(pm_buffer_t *buffer, const pm_integer_t *integer);
#endif
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