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//! Parsing numbers.
use crate::{
error::ParseError,
ibig::IBig,
radix::{self, Digit},
sign::Sign::*,
ubig::UBig,
};
use core::str::FromStr;
mod non_power_two;
mod power_two;
impl FromStr for UBig {
type Err = ParseError;
fn from_str(s: &str) -> Result<UBig, ParseError> {
UBig::from_str_radix(s, 10)
}
}
impl FromStr for IBig {
type Err = ParseError;
fn from_str(s: &str) -> Result<IBig, ParseError> {
IBig::from_str_radix(s, 10)
}
}
impl UBig {
/// Convert a string in a given base to [UBig].
///
/// `src` may contain an optional `+` prefix.
/// Digits 10-35 are represented by `a-z` or `A-Z`.
///
/// # Panics
///
/// Panics if `radix` is not between 2 and 36 inclusive.
///
/// # Examples
/// ```
/// # use ibig::{error::ParseError, ubig, UBig};
/// assert_eq!(UBig::from_str_radix("+7ab", 32)?, ubig!(7499));
/// # Ok::<(), ParseError>(())
/// ```
pub fn from_str_radix(src: &str, radix: u32) -> Result<UBig, ParseError> {
radix::check_radix_valid(radix);
let src = src.strip_prefix('+').unwrap_or(src);
UBig::from_str_radix_no_sign(src, radix)
}
/// Convert a string with an optional radix prefix to [UBig].
///
/// `src` may contain an optional `+` after the radix prefix.
///
/// Allowed prefixes: `0b` for binary, `0o` for octal, `0x` for hexadecimal.
///
/// # Examples
///
/// ```
/// # use ibig::{error::ParseError, ubig, UBig};
/// assert_eq!(UBig::from_str_with_radix_prefix("+0o17")?, ubig!(0o17));
/// assert_eq!(UBig::from_str_with_radix_prefix("0x1f")?, ubig!(0x1f));
/// # Ok::<(), ParseError>(())
/// ```
pub fn from_str_with_radix_prefix(src: &str) -> Result<UBig, ParseError> {
let src = src.strip_prefix('+').unwrap_or(src);
UBig::from_str_with_radix_prefix_no_sign(src)
}
/// Convert an unsigned string with an optional radix prefix to [UBig].
fn from_str_with_radix_prefix_no_sign(src: &str) -> Result<UBig, ParseError> {
if let Some(bin) = src.strip_prefix("0b") {
UBig::from_str_radix_no_sign(bin, 2)
} else if let Some(oct) = src.strip_prefix("0o") {
UBig::from_str_radix_no_sign(oct, 8)
} else if let Some(hex) = src.strip_prefix("0x") {
UBig::from_str_radix_no_sign(hex, 16)
} else {
UBig::from_str_radix_no_sign(src, 10)
}
}
/// Convert an unsigned string to [UBig].
fn from_str_radix_no_sign(mut src: &str, radix: Digit) -> Result<UBig, ParseError> {
debug_assert!(radix::is_radix_valid(radix));
if src.is_empty() {
return Err(ParseError::NoDigits);
}
while let Some(src2) = src.strip_prefix('0') {
src = src2;
}
if radix.is_power_of_two() {
power_two::parse(src, radix)
} else {
non_power_two::parse(src, radix)
}
}
}
impl IBig {
/// Convert a string in a given base to [IBig].
///
/// The string may contain a `+` or `-` prefix.
/// Digits 10-35 are represented by `a-z` or `A-Z`.
///
/// # Panics
///
/// Panics if `radix` is not between 2 and 36 inclusive.
///
/// # Examples
/// ```
/// # use ibig::{error::ParseError, ibig, IBig};
/// assert_eq!(IBig::from_str_radix("-7ab", 32)?, ibig!(-7499));
/// # Ok::<(), ParseError>(())
/// ```
pub fn from_str_radix(mut src: &str, radix: u32) -> Result<IBig, ParseError> {
radix::check_radix_valid(radix);
let sign;
match src.strip_prefix('-') {
Some(s) => {
sign = Negative;
src = s;
}
None => {
sign = Positive;
src = src.strip_prefix('+').unwrap_or(src);
}
}
let mag = UBig::from_str_radix_no_sign(src, radix)?;
Ok(IBig::from_sign_magnitude(sign, mag))
}
/// Convert a string with an optional radix prefix to [IBig].
///
/// `src` may contain an '+' or `-` prefix after the radix prefix.
///
/// Allowed prefixes: `0b` for binary, `0o` for octal, `0x` for hexadecimal.
///
/// # Examples
/// ```
/// # use ibig::{error::ParseError, ibig, IBig};
/// assert_eq!(IBig::from_str_with_radix_prefix("+0o17")?, ibig!(0o17));
/// assert_eq!(IBig::from_str_with_radix_prefix("-0x1f")?, ibig!(-0x1f));
/// # Ok::<(), ParseError>(())
/// ```
pub fn from_str_with_radix_prefix(mut src: &str) -> Result<IBig, ParseError> {
let sign;
match src.strip_prefix('-') {
Some(s) => {
sign = Negative;
src = s;
}
None => {
sign = Positive;
src = src.strip_prefix('+').unwrap_or(src);
}
}
let mag = UBig::from_str_with_radix_prefix_no_sign(src)?;
Ok(IBig::from_sign_magnitude(sign, mag))
}
}