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//! Parsers recognizing bytes streams, streaming version
use crate::error::ErrorKind;
use crate::error::ParseError;
use crate::internal::{Err, IResult, Needed, Parser};
use crate::lib::std::ops::RangeFrom;
use crate::lib::std::result::Result::*;
use crate::traits::{
Compare, CompareResult, FindSubstring, FindToken, InputIter, InputLength, InputTake,
InputTakeAtPosition, Slice, ToUsize,
};
/// Recognizes a pattern.
///
/// The input data will be compared to the tag combinator's argument and will return the part of
/// the input that matches the argument.
/// # Example
/// ```rust
/// # use nom::{Err, error::{Error, ErrorKind}, Needed, IResult};
/// use nom::bytes::streaming::tag;
///
/// fn parser(s: &str) -> IResult<&str, &str> {
/// tag("Hello")(s)
/// }
///
/// assert_eq!(parser("Hello, World!"), Ok((", World!", "Hello")));
/// assert_eq!(parser("Something"), Err(Err::Error(Error::new("Something", ErrorKind::Tag))));
/// assert_eq!(parser("S"), Err(Err::Error(Error::new("S", ErrorKind::Tag))));
/// assert_eq!(parser("H"), Err(Err::Incomplete(Needed::new(4))));
/// ```
pub fn tag<T, Input, Error: ParseError<Input>>(
tag: T,
) -> impl Fn(Input) -> IResult<Input, Input, Error>
where
Input: InputTake + InputLength + Compare<T>,
T: InputLength + Clone,
{
move |i: Input| {
let tag_len = tag.input_len();
let t = tag.clone();
let res: IResult<_, _, Error> = match i.compare(t) {
CompareResult::Ok => Ok(i.take_split(tag_len)),
CompareResult::Incomplete => Err(Err::Incomplete(Needed::new(tag_len - i.input_len()))),
CompareResult::Error => {
let e: ErrorKind = ErrorKind::Tag;
Err(Err::Error(Error::from_error_kind(i, e)))
}
};
res
}
}
/// Recognizes a case insensitive pattern.
///
/// The input data will be compared to the tag combinator's argument and will return the part of
/// the input that matches the argument with no regard to case.
/// # Example
/// ```rust
/// # use nom::{Err, error::{Error, ErrorKind}, Needed, IResult};
/// use nom::bytes::streaming::tag_no_case;
///
/// fn parser(s: &str) -> IResult<&str, &str> {
/// tag_no_case("hello")(s)
/// }
///
/// assert_eq!(parser("Hello, World!"), Ok((", World!", "Hello")));
/// assert_eq!(parser("hello, World!"), Ok((", World!", "hello")));
/// assert_eq!(parser("HeLlO, World!"), Ok((", World!", "HeLlO")));
/// assert_eq!(parser("Something"), Err(Err::Error(Error::new("Something", ErrorKind::Tag))));
/// assert_eq!(parser(""), Err(Err::Incomplete(Needed::new(5))));
/// ```
pub fn tag_no_case<T, Input, Error: ParseError<Input>>(
tag: T,
) -> impl Fn(Input) -> IResult<Input, Input, Error>
where
Input: InputTake + InputLength + Compare<T>,
T: InputLength + Clone,
{
move |i: Input| {
let tag_len = tag.input_len();
let t = tag.clone();
let res: IResult<_, _, Error> = match (i).compare_no_case(t) {
CompareResult::Ok => Ok(i.take_split(tag_len)),
CompareResult::Incomplete => Err(Err::Incomplete(Needed::new(tag_len - i.input_len()))),
CompareResult::Error => {
let e: ErrorKind = ErrorKind::Tag;
Err(Err::Error(Error::from_error_kind(i, e)))
}
};
res
}
}
/// Parse till certain characters are met.
///
/// The parser will return the longest slice till one of the characters of the combinator's argument are met.
///
/// It doesn't consume the matched character.
///
/// It will return a `Err::Incomplete(Needed::new(1))` if the pattern wasn't met.
/// # Example
/// ```rust
/// # use nom::{Err, error::ErrorKind, Needed, IResult};
/// use nom::bytes::streaming::is_not;
///
/// fn not_space(s: &str) -> IResult<&str, &str> {
/// is_not(" \t\r\n")(s)
/// }
///
/// assert_eq!(not_space("Hello, World!"), Ok((" World!", "Hello,")));
/// assert_eq!(not_space("Sometimes\t"), Ok(("\t", "Sometimes")));
/// assert_eq!(not_space("Nospace"), Err(Err::Incomplete(Needed::new(1))));
/// assert_eq!(not_space(""), Err(Err::Incomplete(Needed::new(1))));
/// ```
pub fn is_not<T, Input, Error: ParseError<Input>>(
arr: T,
) -> impl Fn(Input) -> IResult<Input, Input, Error>
where
Input: InputTakeAtPosition,
T: FindToken<<Input as InputTakeAtPosition>::Item>,
{
move |i: Input| {
let e: ErrorKind = ErrorKind::IsNot;
i.split_at_position1(|c| arr.find_token(c), e)
}
}
/// Returns the longest slice of the matches the pattern.
///
/// The parser will return the longest slice consisting of the characters in provided in the
/// combinator's argument.
///
/// # Streaming specific
/// *Streaming version* will return a `Err::Incomplete(Needed::new(1))` if the pattern wasn't met
/// or if the pattern reaches the end of the input.
/// # Example
/// ```rust
/// # use nom::{Err, error::ErrorKind, Needed, IResult};
/// use nom::bytes::streaming::is_a;
///
/// fn hex(s: &str) -> IResult<&str, &str> {
/// is_a("1234567890ABCDEF")(s)
/// }
///
/// assert_eq!(hex("123 and voila"), Ok((" and voila", "123")));
/// assert_eq!(hex("DEADBEEF and others"), Ok((" and others", "DEADBEEF")));
/// assert_eq!(hex("BADBABEsomething"), Ok(("something", "BADBABE")));
/// assert_eq!(hex("D15EA5E"), Err(Err::Incomplete(Needed::new(1))));
/// assert_eq!(hex(""), Err(Err::Incomplete(Needed::new(1))));
/// ```
pub fn is_a<T, Input, Error: ParseError<Input>>(
arr: T,
) -> impl Fn(Input) -> IResult<Input, Input, Error>
where
Input: InputTakeAtPosition,
T: FindToken<<Input as InputTakeAtPosition>::Item>,
{
move |i: Input| {
let e: ErrorKind = ErrorKind::IsA;
i.split_at_position1(|c| !arr.find_token(c), e)
}
}
/// Returns the longest input slice (if any) that matches the predicate.
///
/// The parser will return the longest slice that matches the given predicate *(a function that
/// takes the input and returns a bool)*.
///
/// # Streaming Specific
/// *Streaming version* will return a `Err::Incomplete(Needed::new(1))` if the pattern reaches the end of the input.
/// # Example
/// ```rust
/// # use nom::{Err, error::ErrorKind, Needed, IResult};
/// use nom::bytes::streaming::take_while;
/// use nom::character::is_alphabetic;
///
/// fn alpha(s: &[u8]) -> IResult<&[u8], &[u8]> {
/// take_while(is_alphabetic)(s)
/// }
///
/// assert_eq!(alpha(b"latin123"), Ok((&b"123"[..], &b"latin"[..])));
/// assert_eq!(alpha(b"12345"), Ok((&b"12345"[..], &b""[..])));
/// assert_eq!(alpha(b"latin"), Err(Err::Incomplete(Needed::new(1))));
/// assert_eq!(alpha(b""), Err(Err::Incomplete(Needed::new(1))));
/// ```
pub fn take_while<F, Input, Error: ParseError<Input>>(
cond: F,
) -> impl Fn(Input) -> IResult<Input, Input, Error>
where
Input: InputTakeAtPosition,
F: Fn(<Input as InputTakeAtPosition>::Item) -> bool,
{
move |i: Input| i.split_at_position(|c| !cond(c))
}
/// Returns the longest (at least 1) input slice that matches the predicate.
///
/// The parser will return the longest slice that matches the given predicate *(a function that
/// takes the input and returns a bool)*.
///
/// It will return an `Err(Err::Error((_, ErrorKind::TakeWhile1)))` if the pattern wasn't met.
///
/// # Streaming Specific
/// *Streaming version* will return a `Err::Incomplete(Needed::new(1))` or if the pattern reaches the end of the input.
///
/// # Example
/// ```rust
/// # use nom::{Err, error::{Error, ErrorKind}, Needed, IResult};
/// use nom::bytes::streaming::take_while1;
/// use nom::character::is_alphabetic;
///
/// fn alpha(s: &[u8]) -> IResult<&[u8], &[u8]> {
/// take_while1(is_alphabetic)(s)
/// }
///
/// assert_eq!(alpha(b"latin123"), Ok((&b"123"[..], &b"latin"[..])));
/// assert_eq!(alpha(b"latin"), Err(Err::Incomplete(Needed::new(1))));
/// assert_eq!(alpha(b"12345"), Err(Err::Error(Error::new(&b"12345"[..], ErrorKind::TakeWhile1))));
/// ```
pub fn take_while1<F, Input, Error: ParseError<Input>>(
cond: F,
) -> impl Fn(Input) -> IResult<Input, Input, Error>
where
Input: InputTakeAtPosition,
F: Fn(<Input as InputTakeAtPosition>::Item) -> bool,
{
move |i: Input| {
let e: ErrorKind = ErrorKind::TakeWhile1;
i.split_at_position1(|c| !cond(c), e)
}
}
/// Returns the longest (m <= len <= n) input slice that matches the predicate.
///
/// The parser will return the longest slice that matches the given predicate *(a function that
/// takes the input and returns a bool)*.
///
/// It will return an `Err::Error((_, ErrorKind::TakeWhileMN))` if the pattern wasn't met.
/// # Streaming Specific
/// *Streaming version* will return a `Err::Incomplete(Needed::new(1))` if the pattern reaches the end of the input or is too short.
///
/// # Example
/// ```rust
/// # use nom::{Err, error::{Error, ErrorKind}, Needed, IResult};
/// use nom::bytes::streaming::take_while_m_n;
/// use nom::character::is_alphabetic;
///
/// fn short_alpha(s: &[u8]) -> IResult<&[u8], &[u8]> {
/// take_while_m_n(3, 6, is_alphabetic)(s)
/// }
///
/// assert_eq!(short_alpha(b"latin123"), Ok((&b"123"[..], &b"latin"[..])));
/// assert_eq!(short_alpha(b"lengthy"), Ok((&b"y"[..], &b"length"[..])));
/// assert_eq!(short_alpha(b"latin"), Err(Err::Incomplete(Needed::new(1))));
/// assert_eq!(short_alpha(b"ed"), Err(Err::Incomplete(Needed::new(1))));
/// assert_eq!(short_alpha(b"12345"), Err(Err::Error(Error::new(&b"12345"[..], ErrorKind::TakeWhileMN))));
/// ```
pub fn take_while_m_n<F, Input, Error: ParseError<Input>>(
m: usize,
n: usize,
cond: F,
) -> impl Fn(Input) -> IResult<Input, Input, Error>
where
Input: InputTake + InputIter + InputLength,
F: Fn(<Input as InputIter>::Item) -> bool,
{
move |i: Input| {
let input = i;
match input.position(|c| !cond(c)) {
Some(idx) => {
if idx >= m {
if idx <= n {
let res: IResult<_, _, Error> = if let Ok(index) = input.slice_index(idx) {
Ok(input.take_split(index))
} else {
Err(Err::Error(Error::from_error_kind(
input,
ErrorKind::TakeWhileMN,
)))
};
res
} else {
let res: IResult<_, _, Error> = if let Ok(index) = input.slice_index(n) {
Ok(input.take_split(index))
} else {
Err(Err::Error(Error::from_error_kind(
input,
ErrorKind::TakeWhileMN,
)))
};
res
}
} else {
let e = ErrorKind::TakeWhileMN;
Err(Err::Error(Error::from_error_kind(input, e)))
}
}
None => {
let len = input.input_len();
if len >= n {
match input.slice_index(n) {
Ok(index) => Ok(input.take_split(index)),
Err(_needed) => Err(Err::Error(Error::from_error_kind(
input,
ErrorKind::TakeWhileMN,
))),
}
} else {
let needed = if m > len { m - len } else { 1 };
Err(Err::Incomplete(Needed::new(needed)))
}
}
}
}
}
/// Returns the longest input slice (if any) till a predicate is met.
///
/// The parser will return the longest slice till the given predicate *(a function that
/// takes the input and returns a bool)*.
///
/// # Streaming Specific
/// *Streaming version* will return a `Err::Incomplete(Needed::new(1))` if the match reaches the
/// end of input or if there was not match.
///
/// # Example
/// ```rust
/// # use nom::{Err, error::ErrorKind, Needed, IResult};
/// use nom::bytes::streaming::take_till;
///
/// fn till_colon(s: &str) -> IResult<&str, &str> {
/// take_till(|c| c == ':')(s)
/// }
///
/// assert_eq!(till_colon("latin:123"), Ok((":123", "latin")));
/// assert_eq!(till_colon(":empty matched"), Ok((":empty matched", ""))); //allowed
/// assert_eq!(till_colon("12345"), Err(Err::Incomplete(Needed::new(1))));
/// assert_eq!(till_colon(""), Err(Err::Incomplete(Needed::new(1))));
/// ```
pub fn take_till<F, Input, Error: ParseError<Input>>(
cond: F,
) -> impl Fn(Input) -> IResult<Input, Input, Error>
where
Input: InputTakeAtPosition,
F: Fn(<Input as InputTakeAtPosition>::Item) -> bool,
{
move |i: Input| i.split_at_position(|c| cond(c))
}
/// Returns the longest (at least 1) input slice till a predicate is met.
///
/// The parser will return the longest slice till the given predicate *(a function that
/// takes the input and returns a bool)*.
///
/// # Streaming Specific
/// *Streaming version* will return a `Err::Incomplete(Needed::new(1))` if the match reaches the
/// end of input or if there was not match.
/// # Example
/// ```rust
/// # use nom::{Err, error::{Error, ErrorKind}, Needed, IResult};
/// use nom::bytes::streaming::take_till1;
///
/// fn till_colon(s: &str) -> IResult<&str, &str> {
/// take_till1(|c| c == ':')(s)
/// }
///
/// assert_eq!(till_colon("latin:123"), Ok((":123", "latin")));
/// assert_eq!(till_colon(":empty matched"), Err(Err::Error(Error::new(":empty matched", ErrorKind::TakeTill1))));
/// assert_eq!(till_colon("12345"), Err(Err::Incomplete(Needed::new(1))));
/// assert_eq!(till_colon(""), Err(Err::Incomplete(Needed::new(1))));
/// ```
pub fn take_till1<F, Input, Error: ParseError<Input>>(
cond: F,
) -> impl Fn(Input) -> IResult<Input, Input, Error>
where
Input: InputTakeAtPosition,
F: Fn(<Input as InputTakeAtPosition>::Item) -> bool,
{
move |i: Input| {
let e: ErrorKind = ErrorKind::TakeTill1;
i.split_at_position1(|c| cond(c), e)
}
}
/// Returns an input slice containing the first N input elements (Input[..N]).
///
/// # Streaming Specific
/// *Streaming version* if the input has less than N elements, `take` will
/// return a `Err::Incomplete(Needed::new(M))` where M is the number of
/// additional bytes the parser would need to succeed.
/// It is well defined for `&[u8]` as the number of elements is the byte size,
/// but for types like `&str`, we cannot know how many bytes correspond for
/// the next few chars, so the result will be `Err::Incomplete(Needed::Unknown)`
///
/// # Example
/// ```rust
/// # use nom::{Err, error::ErrorKind, Needed, IResult};
/// use nom::bytes::streaming::take;
///
/// fn take6(s: &str) -> IResult<&str, &str> {
/// take(6usize)(s)
/// }
///
/// assert_eq!(take6("1234567"), Ok(("7", "123456")));
/// assert_eq!(take6("things"), Ok(("", "things")));
/// assert_eq!(take6("short"), Err(Err::Incomplete(Needed::Unknown)));
/// ```
pub fn take<C, Input, Error: ParseError<Input>>(
count: C,
) -> impl Fn(Input) -> IResult<Input, Input, Error>
where
Input: InputIter + InputTake + InputLength,
C: ToUsize,
{
let c = count.to_usize();
move |i: Input| match i.slice_index(c) {
Err(i) => Err(Err::Incomplete(i)),
Ok(index) => Ok(i.take_split(index)),
}
}
/// Returns the input slice up to the first occurrence of the pattern.
///
/// It doesn't consume the pattern.
///
/// # Streaming Specific
/// *Streaming version* will return a `Err::Incomplete(Needed::new(N))` if the input doesn't
/// contain the pattern or if the input is smaller than the pattern.
/// # Example
/// ```rust
/// # use nom::{Err, error::ErrorKind, Needed, IResult};
/// use nom::bytes::streaming::take_until;
///
/// fn until_eof(s: &str) -> IResult<&str, &str> {
/// take_until("eof")(s)
/// }
///
/// assert_eq!(until_eof("hello, worldeof"), Ok(("eof", "hello, world")));
/// assert_eq!(until_eof("hello, world"), Err(Err::Incomplete(Needed::Unknown)));
/// assert_eq!(until_eof("hello, worldeo"), Err(Err::Incomplete(Needed::Unknown)));
/// assert_eq!(until_eof("1eof2eof"), Ok(("eof2eof", "1")));
/// ```
pub fn take_until<T, Input, Error: ParseError<Input>>(
tag: T,
) -> impl Fn(Input) -> IResult<Input, Input, Error>
where
Input: InputTake + InputLength + FindSubstring<T>,
T: Clone,
{
move |i: Input| {
let t = tag.clone();
let res: IResult<_, _, Error> = match i.find_substring(t) {
None => Err(Err::Incomplete(Needed::Unknown)),
Some(index) => Ok(i.take_split(index)),
};
res
}
}
/// Returns the non empty input slice up to the first occurrence of the pattern.
///
/// It doesn't consume the pattern.
///
/// # Streaming Specific
/// *Streaming version* will return a `Err::Incomplete(Needed::new(N))` if the input doesn't
/// contain the pattern or if the input is smaller than the pattern.
/// # Example
/// ```rust
/// # use nom::{Err, error::{Error, ErrorKind}, Needed, IResult};
/// use nom::bytes::streaming::take_until1;
///
/// fn until_eof(s: &str) -> IResult<&str, &str> {
/// take_until1("eof")(s)
/// }
///
/// assert_eq!(until_eof("hello, worldeof"), Ok(("eof", "hello, world")));
/// assert_eq!(until_eof("hello, world"), Err(Err::Incomplete(Needed::Unknown)));
/// assert_eq!(until_eof("hello, worldeo"), Err(Err::Incomplete(Needed::Unknown)));
/// assert_eq!(until_eof("1eof2eof"), Ok(("eof2eof", "1")));
/// assert_eq!(until_eof("eof"), Err(Err::Error(Error::new("eof", ErrorKind::TakeUntil))));
/// ```
pub fn take_until1<T, Input, Error: ParseError<Input>>(
tag: T,
) -> impl Fn(Input) -> IResult<Input, Input, Error>
where
Input: InputTake + InputLength + FindSubstring<T>,
T: Clone,
{
move |i: Input| {
let t = tag.clone();
let res: IResult<_, _, Error> = match i.find_substring(t) {
None => Err(Err::Incomplete(Needed::Unknown)),
Some(0) => Err(Err::Error(Error::from_error_kind(i, ErrorKind::TakeUntil))),
Some(index) => Ok(i.take_split(index)),
};
res
}
}
/// Matches a byte string with escaped characters.
///
/// * The first argument matches the normal characters (it must not accept the control character)
/// * The second argument is the control character (like `\` in most languages)
/// * The third argument matches the escaped characters
/// # Example
/// ```
/// # use nom::{Err, error::ErrorKind, Needed, IResult};
/// # use nom::character::complete::digit1;
/// use nom::bytes::streaming::escaped;
/// use nom::character::streaming::one_of;
///
/// fn esc(s: &str) -> IResult<&str, &str> {
/// escaped(digit1, '\\', one_of("\"n\\"))(s)
/// }
///
/// assert_eq!(esc("123;"), Ok((";", "123")));
/// assert_eq!(esc("12\\\"34;"), Ok((";", "12\\\"34")));
/// ```
///
pub fn escaped<Input, Error, F, G, O1, O2>(
mut normal: F,
control_char: char,
mut escapable: G,
) -> impl FnMut(Input) -> IResult<Input, Input, Error>
where
Input: Clone
+ crate::traits::Offset
+ InputLength
+ InputTake
+ InputTakeAtPosition
+ Slice<RangeFrom<usize>>
+ InputIter,
<Input as InputIter>::Item: crate::traits::AsChar,
F: Parser<Input, O1, Error>,
G: Parser<Input, O2, Error>,
Error: ParseError<Input>,
{
use crate::traits::AsChar;
move |input: Input| {
let mut i = input.clone();
while i.input_len() > 0 {
let current_len = i.input_len();
match normal.parse(i.clone()) {
Ok((i2, _)) => {
if i2.input_len() == 0 {
return Err(Err::Incomplete(Needed::Unknown));
} else if i2.input_len() == current_len {
let index = input.offset(&i2);
return Ok(input.take_split(index));
} else {
i = i2;
}
}
Err(Err::Error(_)) => {
// unwrap() should be safe here since index < $i.input_len()
if i.iter_elements().next().unwrap().as_char() == control_char {
let next = control_char.len_utf8();
if next >= i.input_len() {
return Err(Err::Incomplete(Needed::new(1)));
} else {
match escapable.parse(i.slice(next..)) {
Ok((i2, _)) => {
if i2.input_len() == 0 {
return Err(Err::Incomplete(Needed::Unknown));
} else {
i = i2;
}
}
Err(e) => return Err(e),
}
}
} else {
let index = input.offset(&i);
return Ok(input.take_split(index));
}
}
Err(e) => {
return Err(e);
}
}
}
Err(Err::Incomplete(Needed::Unknown))
}
}
/// Matches a byte string with escaped characters.
///
/// * The first argument matches the normal characters (it must not match the control character)
/// * The second argument is the control character (like `\` in most languages)
/// * The third argument matches the escaped characters and transforms them
///
/// As an example, the chain `abc\tdef` could be `abc def` (it also consumes the control character)
///
/// ```
/// # use nom::{Err, error::ErrorKind, Needed, IResult};
/// # use std::str::from_utf8;
/// use nom::bytes::streaming::{escaped_transform, tag};
/// use nom::character::streaming::alpha1;
/// use nom::branch::alt;
/// use nom::combinator::value;
///
/// fn parser(input: &str) -> IResult<&str, String> {
/// escaped_transform(
/// alpha1,
/// '\\',
/// alt((
/// value("\\", tag("\\")),
/// value("\"", tag("\"")),
/// value("\n", tag("n")),
/// ))
/// )(input)
/// }
///
/// assert_eq!(parser("ab\\\"cd\""), Ok(("\"", String::from("ab\"cd"))));
/// ```
#[cfg(feature = "alloc")]
#[cfg_attr(feature = "docsrs", doc(cfg(feature = "alloc")))]
pub fn escaped_transform<Input, Error, F, G, O1, O2, ExtendItem, Output>(
mut normal: F,
control_char: char,
mut transform: G,
) -> impl FnMut(Input) -> IResult<Input, Output, Error>
where
Input: Clone
+ crate::traits::Offset
+ InputLength
+ InputTake
+ InputTakeAtPosition
+ Slice<RangeFrom<usize>>
+ InputIter,
Input: crate::traits::ExtendInto<Item = ExtendItem, Extender = Output>,
O1: crate::traits::ExtendInto<Item = ExtendItem, Extender = Output>,
O2: crate::traits::ExtendInto<Item = ExtendItem, Extender = Output>,
<Input as InputIter>::Item: crate::traits::AsChar,
F: Parser<Input, O1, Error>,
G: Parser<Input, O2, Error>,
Error: ParseError<Input>,
{
use crate::traits::AsChar;
move |input: Input| {
let mut index = 0;
let mut res = input.new_builder();
let i = input.clone();
while index < i.input_len() {
let current_len = i.input_len();
let remainder = i.slice(index..);
match normal.parse(remainder.clone()) {
Ok((i2, o)) => {
o.extend_into(&mut res);
if i2.input_len() == 0 {
return Err(Err::Incomplete(Needed::Unknown));
} else if i2.input_len() == current_len {
return Ok((remainder, res));
} else {
index = input.offset(&i2);
}
}
Err(Err::Error(_)) => {
// unwrap() should be safe here since index < $i.input_len()
if remainder.iter_elements().next().unwrap().as_char() == control_char {
let next = index + control_char.len_utf8();
let input_len = input.input_len();
if next >= input_len {
return Err(Err::Incomplete(Needed::Unknown));
} else {
match transform.parse(i.slice(next..)) {
Ok((i2, o)) => {
o.extend_into(&mut res);
if i2.input_len() == 0 {
return Err(Err::Incomplete(Needed::Unknown));
} else {
index = input.offset(&i2);
}
}
Err(e) => return Err(e),
}
}
} else {
return Ok((remainder, res));
}
}
Err(e) => return Err(e),
}
}
Err(Err::Incomplete(Needed::Unknown))
}
}