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use super::{ErrorKind, ParseDirection, ParseValueResult, Parser};
impl<'a> Parser<'a> {
/// Parses a `u128` until a non-digit is reached.
///
/// To parse an integer from an entire string (erroring on non-digit bytes),
/// you can use [`primitive::parse_u128`]
///
/// You also can use the [`parse_with`](../macro.parse_with.html)
/// macro to parse a `u128`, and other [`ParserFor`](./trait.ParserFor.html) types.
///
/// # Example
///
/// ```rust
/// use konst::{
/// parsing::{Parser, ParseValueResult},
/// unwrap_ctx,
/// try_rebind,
/// };
///
/// {
/// let parser = Parser::from_str("12345");
/// let (num, parser) = unwrap_ctx!(parser.parse_u128());
/// assert_eq!(num, 12345);
/// assert!(parser.bytes().is_empty());
/// }
///
/// /// Parses a `[u128; 2]` from a parser starting with `"<number>;<number>", eg: `"100;400"`.
/// const fn parse_pair(mut parser: Parser<'_>) -> ParseValueResult<'_, [u128; 2]> {
/// let mut ret = [0; 2];
///
/// // `try_rebind` is like the `?` operator,
/// // and it assigns the value in the Ok variant into either a
/// // single pre-existing variable or multiple (if the Ok value is a tuple)
/// try_rebind!{(ret[0], parser) = parser.parse_u128()};
///
/// // parsing the `;``between the integers.
/// //
/// // Note that because we don't use `.trim_start()` afterwards,
/// // this can't be followed by spaces.
/// try_rebind!{parser = parser.strip_prefix(";")};
///
/// try_rebind!{(ret[1], parser) = parser.parse_u128()};
///
/// Ok((ret, parser))
/// }
/// const PAIR: ([u128; 2], Parser<'_>) = {
/// let parser = Parser::from_str("1365;6789");
/// unwrap_ctx!(parse_pair(parser))
/// };
///
/// assert_eq!(PAIR.0[0], 1365);
/// assert_eq!(PAIR.0[1], 6789);
///
/// assert!(PAIR.1.is_empty());
///
/// ```
///
/// [`primitive::parse_u128`]: ../primitive/fn.parse_u128.html
pub const fn parse_u128(mut self) -> ParseValueResult<'a, u128> {
parse_integer! {unsigned, (u128, u128), self}
}
/// Parses a `i128` until a non-digit is reached.
///
/// To parse an integer from an entire string (erroring on non-digit bytes),
/// you can use [`primitive::parse_i128`]
///
/// You also can use the [`parse_with`](../macro.parse_with.html)
/// macro to parse a `i128`, and other [`ParserFor`](./trait.ParserFor.html) types.
///
/// # Example
///
/// ```rust
/// use konst::{Parser, unwrap_ctx, rebind_if_ok};
///
/// {
/// let parser = Parser::from_str("12345");
/// let (num, parser) = unwrap_ctx!(parser.parse_i128());
/// assert_eq!(num, 12345);
/// assert!(parser.bytes().is_empty());
/// }
/// {
/// let mut num = 0;
/// let mut parser = Parser::from_str("-54321;6789");
///
/// // `rebind_if_ok` stores the return value of `.parse_i128()` in `num` and `parser`,
/// // if `.parse_i128()` returned an `Ok((u128, Parser))`.
/// rebind_if_ok!{(num, parser) = parser.parse_i128()}
/// assert_eq!(num, -54321);
/// assert_eq!(parser.bytes(), b";6789");
///
/// rebind_if_ok!{parser = parser.strip_prefix(";")}
/// assert_eq!(parser.bytes(), b"6789");
///
/// rebind_if_ok!{(num, parser) = parser.parse_i128()}
/// assert_eq!(num, 6789);
/// assert!(parser.is_empty());
/// }
///
/// ```
///
/// [`primitive::parse_i128`]: ../primitive/fn.parse_i128.html
pub const fn parse_i128(mut self) -> ParseValueResult<'a, i128> {
parse_integer! {signed, (i128, u128), self}
}
/// Parses a `u64` until a non-digit is reached.
///
/// To parse an integer from an entire string (erroring on non-digit bytes),
/// you can use [`primitive::parse_u64`]
///
/// You also can use the [`parse_with`](../macro.parse_with.html)
/// macro to parse a `u64`, and other [`ParserFor`](./trait.ParserFor.html) types.
///
/// # Example
///
/// For an example for how to use this method,
/// you can look at the docs for the [`Parser::parse_u128`](#method.parse_u128) method.
///
/// [`primitive::parse_u64`]: ../primitive/fn.parse_u64.html
pub const fn parse_u64(mut self) -> ParseValueResult<'a, u64> {
parse_integer! {unsigned, (u64, u64), self}
}
/// Parses a `i64` until a non-digit is reached.
///
/// To parse an integer from an entire string (erroring on non-digit bytes),
/// you can use [`primitive::parse_i64`]
///
/// You also can use the [`parse_with`](../macro.parse_with.html)
/// macro to parse a `i64`, and other [`ParserFor`](./trait.ParserFor.html) types.
///
/// # Example
///
/// For an example for how to use this method,
/// you can look at the docs for the [`Parser::parse_i128`](#method.parse_i128) method.
///
/// [`primitive::parse_i64`]: ../primitive/fn.parse_i64.html
pub const fn parse_i64(mut self) -> ParseValueResult<'a, i64> {
parse_integer! {signed, (i64, u64), self}
}
/// Parses a `u32` until a non-digit is reached.
///
/// To parse an integer from an entire string (erroring on non-digit bytes),
/// you can use [`primitive::parse_u32`]
///
/// You also can use the [`parse_with`](../macro.parse_with.html)
/// macro to parse a `u32`, and other [`ParserFor`](./trait.ParserFor.html) types.
///
/// # Example
///
/// For an example for how to use this method,
/// you can look at the docs for the [`Parser::parse_u128`](#method.parse_u128) method.
///
/// [`primitive::parse_u32`]: ../primitive/fn.parse_u32.html
pub const fn parse_u32(mut self) -> ParseValueResult<'a, u32> {
parse_integer! {unsigned, (u32, u32), self}
}
/// Parses a `i32` until a non-digit is reached.
///
/// To parse an integer from an entire string (erroring on non-digit bytes),
/// you can use [`primitive::parse_i32`]
///
/// You also can use the [`parse_with`](../macro.parse_with.html)
/// macro to parse a `i32`, and other [`ParserFor`](./trait.ParserFor.html) types.
///
/// # Example
///
/// For an example for how to use this method,
/// you can look at the docs for the [`Parser::parse_i128`](#method.parse_i128) method.
///
/// [`primitive::parse_i32`]: ../primitive/fn.parse_i32.html
pub const fn parse_i32(mut self) -> ParseValueResult<'a, i32> {
parse_integer! {signed, (i32, u32), self}
}
/// Parses a `u16` until a non-digit is reached.
///
/// To parse an integer from an entire string (erroring on non-digit bytes),
/// you can use [`primitive::parse_u16`]
///
/// You also can use the [`parse_with`](../macro.parse_with.html)
/// macro to parse a `u16`, and other [`ParserFor`](./trait.ParserFor.html) types.
///
/// # Example
///
/// For an example for how to use this method,
/// you can look at the docs for the [`Parser::parse_u128`](#method.parse_u128) method.
///
/// [`primitive::parse_u16`]: ../primitive/fn.parse_u16.html
pub const fn parse_u16(mut self) -> ParseValueResult<'a, u16> {
parse_integer! {unsigned, (u16, u16), self}
}
/// Parses a `i16` until a non-digit is reached.
///
/// To parse an integer from an entire string (erroring on non-digit bytes),
/// you can use [`primitive::parse_i16`]
///
/// You also can use the [`parse_with`](../macro.parse_with.html)
/// macro to parse a `i16`, and other [`ParserFor`](./trait.ParserFor.html) types.
///
/// # Example
///
/// For an example for how to use this method,
/// you can look at the docs for the [`Parser::parse_i128`](#method.parse_i128) method.
///
/// [`primitive::parse_i16`]: ../primitive/fn.parse_i16.html
pub const fn parse_i16(mut self) -> ParseValueResult<'a, i16> {
parse_integer! {signed, (i16, u16), self}
}
/// Parses a `u8` until a non-digit is reached.
///
/// To parse an integer from an entire string (erroring on non-digit bytes),
/// you can use [`primitive::parse_u8`]
///
/// You also can use the [`parse_with`](../macro.parse_with.html)
/// macro to parse a `u8`, and other [`ParserFor`](./trait.ParserFor.html) types.
///
/// # Example
///
/// For an example for how to use this method,
/// you can look at the docs for the [`Parser::parse_u128`](#method.parse_u128) method.
///
/// [`primitive::parse_u8`]: ../primitive/fn.parse_u8.html
pub const fn parse_u8(mut self) -> ParseValueResult<'a, u8> {
parse_integer! {unsigned, (u8, u8), self}
}
/// Parses a `i8` until a non-digit is reached.
///
/// To parse an integer from an entire string (erroring on non-digit bytes),
/// you can use [`primitive::parse_i8`]
///
/// You also can use the [`parse_with`](../macro.parse_with.html)
/// macro to parse a `i8`, and other [`ParserFor`](./trait.ParserFor.html) types.
///
/// # Example
///
/// For an example for how to use this method,
/// you can look at the docs for the [`Parser::parse_i128`](#method.parse_i128) method.
///
/// [`primitive::parse_i8`]: ../primitive/fn.parse_i8.html
pub const fn parse_i8(mut self) -> ParseValueResult<'a, i8> {
parse_integer! {signed, (i8, u8), self}
}
/// Parses a `usize` until a non-digit is reached.
///
/// To parse an integer from an entire string (erroring on non-digit bytes),
/// you can use [`primitive::parse_usize`]
///
/// You also can use the [`parse_with`](../macro.parse_with.html)
/// macro to parse a `usize`, and other [`ParserFor`](./trait.ParserFor.html) types.
///
/// [`primitive::parse_usize`]: ../primitive/fn.parse_usize.html
pub const fn parse_usize(mut self) -> ParseValueResult<'a, usize> {
parse_integer! {unsigned, (usize, usize), self}
}
/// Parses a `isize` until a non-digit is reached.
///
/// To parse an integer from an entire string (erroring on non-digit bytes),
/// you can use [`primitive::parse_isize`]
///
/// You also can use the [`parse_with`](../macro.parse_with.html)
/// macro to parse a `isize`, and other [`ParserFor`](./trait.ParserFor.html) types.
///
/// # Example
///
/// For an example for how to use this method,
/// you can look at the docs for the [`Parser::parse_i128`](#method.parse_i128) method.
///
/// [`primitive::parse_isize`]: ../primitive/fn.parse_isize.html
pub const fn parse_isize(mut self) -> ParseValueResult<'a, isize> {
parse_integer! {signed, (isize, usize), self}
}
}
macro_rules! parse_integer {
($signedness:ident, ($type:ty, $uns:ty), $parser:ident) => (try_parsing! {
$parser, FromStart, ret;{
let mut num: $uns;
parse_integer! {@parse_signed $signedness, ($type, $uns), $parser, num, sign}
while let [byte @ b'0'..=b'9', rem @ ..] = $parser.bytes {
$parser.bytes = rem;
let (next_mul, overflowed_mul) = num.overflowing_mul(10);
let (next_add, overflowed_add) = next_mul.overflowing_add((*byte - b'0') as $uns);
if overflowed_mul | overflowed_add {
throw!(ErrorKind::ParseInteger)
}
num = next_add;
}
parse_integer! {@apply_sign $signedness, ($type, $uns), num, sign}
num
}
});
(@parse_signed signed, ($type:ty, $uns:ty), $parser:ident, $num:ident, $isneg:ident) => {
let $isneg = if let [b'-', rem @ ..] = $parser.bytes {
$parser.bytes = rem;
true
} else {
false
};
parse_integer!(@parse_signed unsigned, ($type, $uns), $parser, $num, $isneg)
};
(@parse_signed unsigned, ($type:ty, $uns:ty), $parser:ident, $num:ident, $isneg:ident) => {
$num = if let [byte @ b'0'..=b'9', rem @ ..] = $parser.bytes {
$parser.bytes = rem;
(*byte - b'0') as $uns
} else {
throw!(ErrorKind::ParseInteger)
};
};
(@apply_sign signed, ($type:ty, $uns:ty), $num:ident, $isneg:ident) => {
const MAX_POS: $uns = <$type>::MAX as $uns;
const MAX_NEG: $uns = <$type>::MIN as $uns;
let $num = if $isneg {
if $num <= MAX_NEG {
($num as $type).wrapping_neg()
} else {
throw!(ErrorKind::ParseInteger)
}
} else {
if $num <= MAX_POS {
$num as $type
} else {
throw!(ErrorKind::ParseInteger)
}
};
};
(@apply_sign unsigned, ($type:ty, $uns:ty), $num:ident, $isneg:ident) => {};
}
use parse_integer;
////////////////////////////////////////////////////////////////////////////////
impl<'a> Parser<'a> {
/// Parses a `bool`.
///
/// To parse a bool from an entire string
/// (erroring if the string isn't exactly `"true"` or `"false"`),
/// you can use [`primitive::parse_bool`]
///
/// You also can use the [`parse_with`](../macro.parse_with.html)
/// macro to parse a `bool`, and other [`ParserFor`](./trait.ParserFor.html) types.
///
/// # Example
///
/// ```rust
/// use konst::{Parser, unwrap_ctx};
///
/// {
/// let parser = Parser::from_str("falsemorestring");
/// let (boolean, parser) = unwrap_ctx!(parser.parse_bool());
/// assert_eq!(boolean, false);
/// assert_eq!(parser.bytes(), "morestring".as_bytes());
/// }
/// {
/// let parser = Parser::from_str("truefoo");
/// let (boolean, parser) = unwrap_ctx!(parser.parse_bool());
/// assert_eq!(boolean, true);
/// assert_eq!(parser.bytes(), "foo".as_bytes());
/// }
///
/// ```
///
/// [`primitive::parse_bool`]: ../primitive/fn.parse_bool.html
pub const fn parse_bool(mut self) -> ParseValueResult<'a, bool> {
try_parsing! {self, FromStart, ret;
match self.bytes {
[b't', b'r', b'u', b'e', rem @ ..] => {
self.bytes = rem;
true
}
[b'f', b'a', b'l', b's', b'e', rem @ ..] => {
self.bytes = rem;
false
}
_ => throw!(ErrorKind::ParseBool),
}
}
}
}