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use crate::string;
use super::{ErrorKind, ParseDirection, ParseError, Parser};
impl<'a> Parser<'a> {
/// Parses a `u128` until a non-digit is reached.
///
/// This method mutates the parser in place on success, leaving it unmodified on error.
///
/// To parse an integer from an entire string (erroring on non-digit bytes),
/// you can use [`u128::from_str_radix`]
///
/// You also can use the [`parse_type`](crate::parsing::parse_type)
/// macro to parse a `u128`, and other [`HasParser`](crate::parsing::HasParser) types.
///
/// # Example
///
/// ```rust
/// use konst::{
/// parsing::{Parser, ParseError},
/// result, try_,
/// };
///
/// {
/// let mut parser = Parser::new("12345");
/// let num = result::unwrap!(parser.parse_u128());
/// assert_eq!(num, 12345);
/// assert!(parser.is_empty());
/// }
///
/// /// Parses a `[u128; 2]` from a parser starting with `"<number>;<number>", eg: `"100;400"`.
/// const fn parse_pair<'a>(parser: &mut Parser<'a>) -> Result<[u128; 2], ParseError<'a>> {
/// let mut ret = [0; 2];
///
/// ret[0] = try_!(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_!(parser.strip_prefix(";"));
///
/// ret[1] = try_!(parser.parse_u128());
///
/// Ok(ret)
/// }
/// const PAIR: [u128; 2] = {
/// let parser = &mut Parser::new("1365;6789");
/// result::unwrap!(parse_pair(parser))
/// };
///
/// assert_eq!(PAIR[0], 1365);
/// assert_eq!(PAIR[1], 6789);
///
///
/// ```
///
pub const fn parse_u128(&mut self) -> Result<u128, ParseError<'a>> {
parse_integer! {unsigned, (u128, u128), self}
}
/// Parses a `i128` until a non-digit is reached.
///
/// This method mutates the parser in place on success, leaving it unmodified on error.
///
/// To parse an integer from an entire string (erroring on non-digit bytes),
/// you can use [`i128::from_str_radix`]
///
/// You also can use the [`parse_type`](crate::parsing::parse_type)
/// macro to parse a `i128`, and other [`HasParser`](crate::parsing::HasParser) types.
///
/// # Example
///
/// ```rust
/// use konst::{Parser, result};
///
/// {
/// let mut parser = Parser::new("12345");
/// let num = result::unwrap!(parser.parse_i128());
/// assert_eq!(num, 12345);
/// assert!(parser.is_empty());
/// }
/// {
/// let mut parser = Parser::new("-54321;6789");
///
/// assert_eq!(result::unwrap!(parser.parse_i128()), -54321);
/// assert_eq!(parser.remainder(), ";6789");
///
/// _ = parser.strip_prefix(";");
/// assert_eq!(parser.remainder(), "6789");
///
/// assert_eq!(result::unwrap!(parser.parse_i128()), 6789);
/// assert!(parser.is_empty());
/// }
///
/// ```
///
pub const fn parse_i128(&mut self) -> Result<i128, ParseError<'a>> {
parse_integer! {signed, (i128, u128), self}
}
/// Parses a `u64` until a non-digit is reached.
///
/// This method mutates the parser in place on success, leaving it unmodified on error.
///
/// To parse an integer from an entire string (erroring on non-digit bytes),
/// you can use [`u64::from_str_radix`]
///
/// You also can use the [`parse_type`](crate::parsing::parse_type)
/// macro to parse a `u64`, and other [`HasParser`](crate::parsing::HasParser) 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.
///
pub const fn parse_u64(&mut self) -> Result<u64, ParseError<'a>> {
parse_integer! {unsigned, (u64, u64), self}
}
/// Parses a `i64` until a non-digit is reached.
///
/// This method mutates the parser in place on success, leaving it unmodified on error.
///
/// To parse an integer from an entire string (erroring on non-digit bytes),
/// you can use [`i64::from_str_radix`]
///
/// You also can use the [`parse_type`](crate::parsing::parse_type)
/// macro to parse a `i64`, and other [`HasParser`](crate::parsing::HasParser) 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.
///
pub const fn parse_i64(&mut self) -> Result<i64, ParseError<'a>> {
parse_integer! {signed, (i64, u64), self}
}
/// Parses a `u32` until a non-digit is reached.
///
/// This method mutates the parser in place on success, leaving it unmodified on error.
///
/// To parse an integer from an entire string (erroring on non-digit bytes),
/// you can use [`u32::from_str_radix`]
///
/// You also can use the [`parse_type`](crate::parsing::parse_type)
/// macro to parse a `u32`, and other [`HasParser`](crate::parsing::HasParser) 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.
///
pub const fn parse_u32(&mut self) -> Result<u32, ParseError<'a>> {
parse_integer! {unsigned, (u32, u32), self}
}
/// Parses a `i32` until a non-digit is reached.
///
/// This method mutates the parser in place on success, leaving it unmodified on error.
///
/// To parse an integer from an entire string (erroring on non-digit bytes),
/// you can use [`i32::from_str_radix`]
///
/// You also can use the [`parse_type`](crate::parsing::parse_type)
/// macro to parse a `i32`, and other [`HasParser`](crate::parsing::HasParser) 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.
///
pub const fn parse_i32(&mut self) -> Result<i32, ParseError<'a>> {
parse_integer! {signed, (i32, u32), self}
}
/// Parses a `u16` until a non-digit is reached.
///
/// This method mutates the parser in place on success, leaving it unmodified on error.
///
/// To parse an integer from an entire string (erroring on non-digit bytes),
/// you can use [`u16::from_str_radix`]
///
/// You also can use the [`parse_type`](crate::parsing::parse_type)
/// macro to parse a `u16`, and other [`HasParser`](crate::parsing::HasParser) 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.
///
pub const fn parse_u16(&mut self) -> Result<u16, ParseError<'a>> {
parse_integer! {unsigned, (u16, u16), self}
}
/// Parses a `i16` until a non-digit is reached.
///
/// This method mutates the parser in place on success, leaving it unmodified on error.
///
/// To parse an integer from an entire string (erroring on non-digit bytes),
/// you can use [`i16::from_str_radix`]
///
/// You also can use the [`parse_type`](crate::parsing::parse_type)
/// macro to parse a `i16`, and other [`HasParser`](crate::parsing::HasParser) 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.
///
pub const fn parse_i16(&mut self) -> Result<i16, ParseError<'a>> {
parse_integer! {signed, (i16, u16), self}
}
/// Parses a `u8` until a non-digit is reached.
///
/// This method mutates the parser in place on success, leaving it unmodified on error.
///
/// To parse an integer from an entire string (erroring on non-digit bytes),
/// you can use [`u8::from_str_radix`]
///
/// You also can use the [`parse_type`](crate::parsing::parse_type)
/// macro to parse a `u8`, and other [`HasParser`](crate::parsing::HasParser) 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.
///
pub const fn parse_u8(&mut self) -> Result<u8, ParseError<'a>> {
parse_integer! {unsigned, (u8, u8), self}
}
/// Parses a `i8` until a non-digit is reached.
///
/// This method mutates the parser in place on success, leaving it unmodified on error.
///
/// To parse an integer from an entire string (erroring on non-digit bytes),
/// you can use [`i8::from_str_radix`]
///
/// You also can use the [`parse_type`](crate::parsing::parse_type)
/// macro to parse a `i8`, and other [`HasParser`](crate::parsing::HasParser) 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.
///
pub const fn parse_i8(&mut self) -> Result<i8, ParseError<'a>> {
parse_integer! {signed, (i8, u8), self}
}
/// Parses a `usize` until a non-digit is reached.
///
/// This method mutates the parser in place on success, leaving it unmodified on error.
///
/// To parse an integer from an entire string (erroring on non-digit bytes),
/// you can use [`usize::from_str_radix`]
///
/// You also can use the [`parse_type`](crate::parsing::parse_type)
/// macro to parse a `usize`, and other [`HasParser`](crate::parsing::HasParser) types.
///
pub const fn parse_usize(&mut self) -> Result<usize, ParseError<'a>> {
parse_integer! {unsigned, (usize, usize), self}
}
/// Parses a `isize` until a non-digit is reached.
///
/// This method mutates the parser in place on success, leaving it unmodified on error.
///
/// To parse an integer from an entire string (erroring on non-digit bytes),
/// you can use [`isize::from_str_radix`]
///
/// You also can use the [`parse_type`](crate::parsing::parse_type)
/// macro to parse a `isize`, and other [`HasParser`](crate::parsing::HasParser) 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.
///
pub const fn parse_isize(&mut self) -> Result<isize, ParseError<'a>> {
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;
let mut bytes = $parser.str.as_bytes();
parse_integer! {@parse_signed $signedness, ($type, $uns), bytes, num, sign}
while let [byte @ b'0'..=b'9', rem @ ..] = bytes {
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}
$parser.str = string::str_from($parser.str, $parser.str.len() - bytes.len());
num
}
});
(@parse_signed signed, ($type:ty, $uns:ty), $bytes:ident, $num:ident, $isneg:ident) => {
let $isneg = if let [b'-', rem @ ..] = $bytes {
$bytes = rem;
true
} else {
false
};
parse_integer!(@parse_signed unsigned, ($type, $uns), $bytes, $num, $isneg)
};
(@parse_signed unsigned, ($type:ty, $uns:ty), $bytes:ident, $num:ident, $isneg:ident) => {
$num = if let [byte @ b'0'..=b'9', rem @ ..] = $bytes {
$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`.
///
/// This method mutates the parser in place on success, leaving it unmodified on error.
///
/// 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_type`](crate::parsing::parse_type)
/// macro to parse a `bool`, and other [`HasParser`](crate::parsing::HasParser) types.
///
/// # Example
///
/// ```rust
/// use konst::{Parser, result};
///
/// {
/// let mut parser = Parser::new("falsemorestring");
/// let boolean = result::unwrap!(parser.parse_bool());
/// assert_eq!(boolean, false);
/// assert_eq!(parser.remainder(), "morestring");
/// }
/// {
/// let mut parser = Parser::new("truefoo");
/// let boolean = result::unwrap!(parser.parse_bool());
/// assert_eq!(boolean, true);
/// assert_eq!(parser.remainder(), "foo");
/// }
///
/// ```
///
/// [`primitive::parse_bool`]: crate::primitive::parse_bool
pub const fn parse_bool(&mut self) -> Result<bool, ParseError<'a>> {
try_parsing! {self, FromStart, ret;
match self.str.as_bytes() {
[b't', b'r', b'u', b'e', ..] => {
self.str = string::str_from(self.str, 4);
true
}
[b'f', b'a', b'l', b's', b'e', ..] => {
self.str = string::str_from(self.str, 5);
false
}
_ => throw!(ErrorKind::ParseBool),
}
}
}
}