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#![warn(clippy::pedantic)]
use super::character_classes::{
DIGIT,
};
use super::context::Context;
use super::error::Error;
struct Shared {
num_groups: usize,
octet_buffer: String,
}
enum State {
NotInOctet(Shared),
ExpectDigitOrDot(Shared),
}
impl State {
fn finalize(self) -> Result<(), Error> {
match self {
Self::NotInOctet(_) => Err(Error::TruncatedHost),
Self::ExpectDigitOrDot(state) => Self::finalize_expect_digit_or_dot(state),
}
}
fn finalize_expect_digit_or_dot(state: Shared) -> Result<(), Error> {
let mut state = state;
if !state.octet_buffer.is_empty() {
state.num_groups += 1;
if state.octet_buffer.parse::<u8>().is_err() {
return Err(Error::InvalidDecimalOctet);
}
}
match state.num_groups {
4 => Ok(()),
n if n < 4 => Err(Error::TooFewAddressParts),
_ => Err(Error::TooManyAddressParts),
}
}
fn new() -> Self {
Self::NotInOctet(Shared{
num_groups: 0,
octet_buffer: String::new(),
})
}
fn next(self, c: char) -> Result<Self, Error> {
match self {
Self::NotInOctet(state) => Self::next_not_in_octet(state, c),
Self::ExpectDigitOrDot(state) => Self::next_expect_digit_or_dot(state, c),
}
}
fn next_not_in_octet(state: Shared, c: char) -> Result<Self, Error> {
let mut state = state;
if DIGIT.contains(&c) {
state.octet_buffer.push(c);
Ok(Self::ExpectDigitOrDot(state))
} else {
Err(Error::IllegalCharacter(Context::Ipv4Address))
}
}
fn next_expect_digit_or_dot(state: Shared, c: char)-> Result<Self, Error> {
let mut state = state;
if c == '.' {
state.num_groups += 1;
if state.num_groups > 4 {
return Err(Error::TooManyAddressParts);
}
if state.octet_buffer.parse::<u8>().is_err() {
return Err(Error::InvalidDecimalOctet);
}
state.octet_buffer.clear();
Ok(Self::NotInOctet(state))
} else if DIGIT.contains(&c) {
state.octet_buffer.push(c);
Ok(Self::ExpectDigitOrDot(state))
} else {
Err(Error::IllegalCharacter(Context::Ipv4Address))
}
}
}
pub fn validate_ipv4_address<T>(address: T) -> Result<(), Error>
where T: AsRef<str>
{
address.as_ref()
.chars()
.try_fold(State::new(), |machine, c| {
machine.next(c)
})?
.finalize()
}
|
