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use lut::{Table, Access};
use lookup_tables::{
MediaTypeChars,
ObsQText, QText,
ObsQTextWs, QTextWs,
Ws
};
use qs::error::CoreError;
use qs::spec::{
PartialCodePoint,
ParsingImpl,
State
};
mod other;
pub use self::other::*;
mod http;
pub use self::http::*;
mod mime;
pub use self::mime::*;
pub trait MimeParsingExt: ParsingImpl {
const ALLOW_UTF8: bool;
const OBS: bool;
fn custom_state(state: FWSState, emit: bool) -> (State<Self>, bool);
fn handle_normal_state(bch: PartialCodePoint) -> Result<(State<Self>, bool), CoreError> {
let iu8 = bch.as_u8();
let is_qtext_ws = if Self::OBS {
MediaTypeChars::check_at(iu8 as usize, ObsQTextWs)
} else {
MediaTypeChars::check_at(iu8 as usize, QTextWs)
};
if is_qtext_ws || (Self::ALLOW_UTF8 && iu8 > 0x7f) {
Ok((State::Normal, true))
} else if iu8 == b'\r' {
Ok(Self::custom_state(FWSState::HitCr, false))
} else {
Err(CoreError::InvalidChar)
}
}
}
#[derive(Copy, Clone, Debug, PartialEq, Eq, Hash)]
pub enum FWSState {
HitCr,
HitNl,
HadFws
}
impl FWSState {
pub fn advance<Impl: MimeParsingExt>(self, bch: PartialCodePoint)
-> Result<(State<Impl>, bool), CoreError>
{
use self::FWSState::*;
let iu8 = bch.as_u8();
match self {
HitCr => {
if iu8 == b'\n' {
Ok(Impl::custom_state(FWSState::HitNl, false))
} else {
Err(CoreError::InvalidChar)
}
},
HitNl => {
if iu8 == b' ' || iu8 == b'\t' {
if Impl::OBS {
Ok((State::Normal, true))
} else {
Ok(Impl::custom_state(FWSState::HadFws, true))
}
} else {
Err(CoreError::InvalidChar)
}
},
HadFws => {
let lres = MediaTypeChars::lookup(iu8 as usize);
let is_qtext = if Impl::OBS {
QText.check(lres)
} else {
ObsQText.check(lres)
};
if is_qtext || (Impl::ALLOW_UTF8 && iu8 > 0x7f) {
Ok((State::Normal, true))
} else if Ws.check(lres) {
Ok(Impl::custom_state(FWSState::HadFws, true))
} else if iu8 == b'"' {
Ok((State::End, false))
} else if iu8 == b'\\' {
Ok((State::QPStart, false))
} else {
Err(CoreError::InvalidChar)
}
}
}
}
}