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Copy pathbytesinner.rs
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1257 lines (1110 loc) · 37.2 KB
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use crate::anystr::{self, AnyStr, AnyStrContainer, AnyStrWrapper};
use crate::builtins::bytearray::PyByteArray;
use crate::builtins::bytes::{PyBytes, PyBytesRef};
use crate::builtins::int::{PyInt, PyIntRef};
use crate::builtins::pystr::{self, PyStr, PyStrRef};
use crate::builtins::PyTypeRef;
use crate::cformat::CFormatBytes;
use crate::function::{OptionalArg, OptionalOption};
use crate::sliceable::PySliceableSequence;
use crate::slots::PyComparisonOp;
use crate::utils::Either;
use crate::vm::VirtualMachine;
use crate::{
IdProtocol, PyComparisonValue, PyIterable, PyObjectRef, PyResult, PyValue,
TryFromBorrowedObject,
};
use bstr::ByteSlice;
use itertools::Itertools;
use num_bigint::BigInt;
use num_traits::ToPrimitive;
use rustpython_common::hash;
#[derive(Debug, Default, Clone)]
pub struct PyBytesInner {
pub(crate) elements: Vec<u8>,
}
impl From<Vec<u8>> for PyBytesInner {
fn from(elements: Vec<u8>) -> PyBytesInner {
Self { elements }
}
}
impl TryFromBorrowedObject for PyBytesInner {
fn try_from_borrowed_object(vm: &VirtualMachine, obj: &PyObjectRef) -> PyResult<Self> {
bytes_from_object(vm, obj).map(Self::from)
}
}
#[derive(FromArgs)]
pub struct ByteInnerNewOptions {
#[pyarg(any, optional)]
source: OptionalArg<PyObjectRef>,
#[pyarg(any, optional)]
encoding: OptionalArg<PyStrRef>,
#[pyarg(any, optional)]
errors: OptionalArg<PyStrRef>,
}
impl ByteInnerNewOptions {
fn get_value_from_string(
s: PyStrRef,
encoding: PyStrRef,
errors: OptionalArg<PyStrRef>,
vm: &VirtualMachine,
) -> PyResult<PyBytesInner> {
let bytes = pystr::encode_string(s, Some(encoding), errors.into_option(), vm)?;
Ok(bytes.as_bytes().to_vec().into())
}
fn get_value_from_source(source: PyObjectRef, vm: &VirtualMachine) -> PyResult<PyBytesInner> {
bytes_from_object(vm, &source).map(|x| x.into())
}
fn get_value_from_size(size: PyIntRef, vm: &VirtualMachine) -> PyResult<PyBytesInner> {
let size = size.as_bigint().to_isize().ok_or_else(|| {
vm.new_overflow_error("cannot fit 'int' into an index-sized integer".to_owned())
})?;
let size = if size < 0 {
return Err(vm.new_value_error("negative count".to_owned()));
} else {
size as usize
};
Ok(vec![0; size].into())
}
pub fn get_bytes(self, cls: PyTypeRef, vm: &VirtualMachine) -> PyResult<PyBytesRef> {
let inner = match (&self.source, &self.encoding, &self.errors) {
(OptionalArg::Present(obj), OptionalArg::Missing, OptionalArg::Missing) => {
let obj = obj.clone();
// construct an exact bytes from an exact bytes do not clone
let obj = if cls.is(PyBytes::class(vm)) {
match obj.downcast_exact::<PyBytes>(vm) {
Ok(b) => {
return Ok(b);
}
Err(obj) => obj,
}
} else {
obj
};
if let Some(bytes_method) = vm.get_method(obj, "__bytes__") {
// construct an exact bytes from __bytes__ slot.
// if __bytes__ return a bytes, use the bytes object except we are the subclass of the bytes
let bytes = vm.invoke(&bytes_method?, ())?;
let bytes = if cls.is(PyBytes::class(vm)) {
match bytes.downcast::<PyBytes>() {
Ok(b) => return Ok(b),
Err(bytes) => bytes,
}
} else {
bytes
};
Some(PyBytesInner::try_from_borrowed_object(vm, &bytes))
} else {
None
}
}
_ => None,
}
.unwrap_or_else(|| self.get_bytearray_inner(vm))?;
PyBytes::from(inner).into_ref_with_type(vm, cls)
}
pub fn get_bytearray_inner(self, vm: &VirtualMachine) -> PyResult<PyBytesInner> {
const STRING_WITHOUT_ENCODING: &str = "string argument without an encoding";
const ENCODING_WITHOUT_STRING: &str = "encoding without a string argument";
match (self.source, self.encoding, self.errors) {
(OptionalArg::Present(obj), OptionalArg::Missing, OptionalArg::Missing) => {
match_class!(match obj {
i @ PyInt => {
Ok(Self::get_value_from_size(i, vm)?)
}
_s @ PyStr => Err(STRING_WITHOUT_ENCODING),
obj => {
Ok(Self::get_value_from_source(obj, vm)?)
}
})
}
(OptionalArg::Present(obj), OptionalArg::Present(encoding), errors) => {
if let Ok(s) = obj.downcast::<PyStr>() {
Ok(Self::get_value_from_string(s, encoding, errors, vm)?)
} else {
Err(ENCODING_WITHOUT_STRING)
}
}
(OptionalArg::Missing, OptionalArg::Missing, OptionalArg::Missing) => {
Ok(PyBytesInner::default())
}
(OptionalArg::Missing, OptionalArg::Present(_), _) => Err(ENCODING_WITHOUT_STRING),
(OptionalArg::Missing, _, OptionalArg::Present(_)) => {
Err("errors without a string argument")
}
(OptionalArg::Present(_), OptionalArg::Missing, OptionalArg::Present(_)) => {
Err(STRING_WITHOUT_ENCODING)
}
}
.map_err(|e| vm.new_type_error(e.to_owned()))
}
}
#[derive(FromArgs)]
pub struct ByteInnerFindOptions {
#[pyarg(positional)]
sub: Either<PyBytesInner, PyIntRef>,
#[pyarg(positional, default)]
start: Option<PyIntRef>,
#[pyarg(positional, default)]
end: Option<PyIntRef>,
}
impl ByteInnerFindOptions {
pub fn get_value(
self,
len: usize,
vm: &VirtualMachine,
) -> PyResult<(Vec<u8>, std::ops::Range<usize>)> {
let sub = match self.sub {
Either::A(v) => v.elements.to_vec(),
Either::B(int) => vec![int.as_bigint().byte_or(vm)?],
};
let range = anystr::adjust_indices(self.start, self.end, len);
Ok((sub, range))
}
}
#[derive(FromArgs)]
pub struct ByteInnerPaddingOptions {
#[pyarg(positional)]
width: isize,
#[pyarg(positional, optional)]
fillchar: OptionalArg<PyObjectRef>,
}
impl ByteInnerPaddingOptions {
fn get_value(self, fn_name: &str, vm: &VirtualMachine) -> PyResult<(isize, u8)> {
let fillchar = if let OptionalArg::Present(v) = self.fillchar {
try_as_bytes(v.clone(), |bytes| bytes.iter().copied().exactly_one().ok())
.flatten()
.ok_or_else(|| {
vm.new_type_error(format!(
"{}() argument 2 must be a byte string of length 1, not {}",
fn_name, &v
))
})?
} else {
b' ' // default is space
};
Ok((self.width, fillchar))
}
}
#[derive(FromArgs)]
pub struct ByteInnerTranslateOptions {
#[pyarg(positional)]
table: Option<PyBytesInner>,
#[pyarg(any, optional)]
delete: OptionalArg<PyBytesInner>,
}
impl ByteInnerTranslateOptions {
pub fn get_value(self, vm: &VirtualMachine) -> PyResult<(Vec<u8>, Vec<u8>)> {
let table = self.table.map_or_else(
|| Ok((0..=255).collect::<Vec<u8>>()),
|v| {
if v.elements.len() != 256 {
return Err(vm.new_value_error(
"translation table must be 256 characters long".to_owned(),
));
}
Ok(v.elements.to_vec())
},
)?;
let delete = match self.delete {
OptionalArg::Present(byte) => byte.elements,
_ => vec![],
};
Ok((table, delete))
}
}
pub type ByteInnerSplitOptions<'a> = anystr::SplitArgs<'a, PyBytesInner>;
impl PyBytesInner {
pub fn repr(&self, prefix: &str, suffix: &str) -> String {
use std::fmt::Write;
let mut out_len = 0usize;
let mut squote = 0;
let mut dquote = 0;
for &ch in self.elements.iter() {
let incr = match ch {
b'\'' => {
squote += 1;
1
}
b'"' => {
dquote += 1;
1
}
b'\\' | b'\t' | b'\r' | b'\n' => 2,
0x20..=0x7e => 1,
_ => 4, // \xHH
};
// TODO: OverflowError
out_len = out_len.checked_add(incr).unwrap();
}
let (quote, num_escaped_quotes) = anystr::choose_quotes_for_repr(squote, dquote);
// we'll be adding backslashes in front of the existing inner quotes
out_len += num_escaped_quotes;
// 3 is for b prefix + outer quotes
out_len += 3 + prefix.len() + suffix.len();
let mut res = String::with_capacity(out_len);
res.push_str(prefix);
res.push('b');
res.push(quote);
for &ch in self.elements.iter() {
match ch {
b'\t' => res.push_str("\\t"),
b'\n' => res.push_str("\\n"),
b'\r' => res.push_str("\\r"),
// printable ascii range
0x20..=0x7e => {
let ch = ch as char;
if ch == quote || ch == '\\' {
res.push('\\');
}
res.push(ch);
}
_ => write!(res, "\\x{:02x}", ch).unwrap(),
}
}
res.push(quote);
res.push_str(suffix);
res
}
#[inline]
pub fn len(&self) -> usize {
self.elements.len()
}
#[inline]
pub fn capacity(&self) -> usize {
self.elements.capacity()
}
#[inline]
pub fn is_empty(&self) -> bool {
self.elements.is_empty()
}
pub fn cmp(
&self,
other: &PyObjectRef,
op: PyComparisonOp,
vm: &VirtualMachine,
) -> PyComparisonValue {
// TODO: bytes can compare with any object implemented buffer protocol
// but not memoryview, and not equal if compare with unicode str(PyStr)
PyComparisonValue::from_option(
other
.try_bytes_like(vm, |other| op.eval_ord(self.elements.as_slice().cmp(other)))
.ok(),
)
}
pub fn hash(&self, vm: &VirtualMachine) -> hash::PyHash {
vm.state.hash_secret.hash_bytes(&self.elements)
}
pub fn add(&self, other: &[u8]) -> Vec<u8> {
self.elements.py_add(other)
}
pub fn contains(
&self,
needle: Either<PyBytesInner, PyIntRef>,
vm: &VirtualMachine,
) -> PyResult<bool> {
Ok(match needle {
Either::A(byte) => self.elements.contains_str(byte.elements.as_slice()),
Either::B(int) => self.elements.contains(&int.as_bigint().byte_or(vm)?),
})
}
pub fn getitem(
&self,
owner_type: &'static str,
needle: PyObjectRef,
vm: &VirtualMachine,
) -> PyResult {
let obj = match self.elements.get_item(vm, needle, owner_type)? {
Either::A(byte) => vm.new_pyobj(byte),
Either::B(bytes) => vm.ctx.new_bytes(bytes),
};
Ok(obj)
}
pub fn isalnum(&self) -> bool {
!self.elements.is_empty()
&& self
.elements
.iter()
.all(|x| char::from(*x).is_alphanumeric())
}
pub fn isalpha(&self) -> bool {
!self.elements.is_empty() && self.elements.iter().all(|x| char::from(*x).is_alphabetic())
}
pub fn isascii(&self) -> bool {
self.elements.iter().all(|x| char::from(*x).is_ascii())
}
pub fn isdigit(&self) -> bool {
!self.elements.is_empty() && self.elements.iter().all(|x| char::from(*x).is_digit(10))
}
pub fn islower(&self) -> bool {
self.elements
.py_iscase(char::is_lowercase, char::is_uppercase)
}
pub fn isupper(&self) -> bool {
self.elements
.py_iscase(char::is_uppercase, char::is_lowercase)
}
pub fn isspace(&self) -> bool {
!self.elements.is_empty()
&& self
.elements
.iter()
.all(|x| char::from(*x).is_ascii_whitespace())
}
pub fn istitle(&self) -> bool {
if self.elements.is_empty() {
return false;
}
let mut iter = self.elements.iter().peekable();
let mut prev_cased = false;
while let Some(c) = iter.next() {
let current = char::from(*c);
let next = if let Some(k) = iter.peek() {
char::from(**k)
} else if current.is_uppercase() {
return !prev_cased;
} else {
return prev_cased;
};
let is_cased = current.to_uppercase().next().unwrap() != current
|| current.to_lowercase().next().unwrap() != current;
if (is_cased && next.is_uppercase() && !prev_cased)
|| (!is_cased && next.is_lowercase())
{
return false;
}
prev_cased = is_cased;
}
true
}
pub fn lower(&self) -> Vec<u8> {
self.elements.to_ascii_lowercase()
}
pub fn upper(&self) -> Vec<u8> {
self.elements.to_ascii_uppercase()
}
pub fn capitalize(&self) -> Vec<u8> {
let mut new: Vec<u8> = Vec::with_capacity(self.elements.len());
if let Some((first, second)) = self.elements.split_first() {
new.push(first.to_ascii_uppercase());
second.iter().for_each(|x| new.push(x.to_ascii_lowercase()));
}
new
}
pub fn swapcase(&self) -> Vec<u8> {
let mut new: Vec<u8> = Vec::with_capacity(self.elements.len());
for w in &self.elements {
match w {
65..=90 => new.push(w.to_ascii_lowercase()),
97..=122 => new.push(w.to_ascii_uppercase()),
x => new.push(*x),
}
}
new
}
pub fn hex(
&self,
sep: OptionalArg<Either<PyStrRef, PyBytesRef>>,
bytes_per_sep: OptionalArg<isize>,
vm: &VirtualMachine,
) -> PyResult<String> {
bytes_to_hex(self.elements.as_slice(), sep, bytes_per_sep, vm)
}
pub fn fromhex(string: &str, vm: &VirtualMachine) -> PyResult<Vec<u8>> {
let mut iter = string.bytes().enumerate();
let mut bytes: Vec<u8> = Vec::with_capacity(string.len() / 2);
let i = loop {
let (i, b) = match iter.next() {
Some(val) => val,
None => {
return Ok(bytes);
}
};
if is_py_ascii_whitespace(b) {
continue;
}
let top = match b {
b'0'..=b'9' => b - b'0',
b'a'..=b'f' => 10 + b - b'a',
b'A'..=b'F' => 10 + b - b'A',
_ => break i,
};
let (i, b) = match iter.next() {
Some(val) => val,
None => break i + 1,
};
let bot = match b {
b'0'..=b'9' => b - b'0',
b'a'..=b'f' => 10 + b - b'a',
b'A'..=b'F' => 10 + b - b'A',
_ => break i,
};
bytes.push((top << 4) + bot);
};
Err(vm.new_value_error(format!(
"non-hexadecimal number found in fromhex() arg at position {}",
i
)))
}
#[inline]
fn _pad(
&self,
options: ByteInnerPaddingOptions,
pad: fn(&[u8], usize, u8, usize) -> Vec<u8>,
vm: &VirtualMachine,
) -> PyResult<Vec<u8>> {
let (width, fillchar) = options.get_value("center", vm)?;
Ok(if self.len() as isize >= width {
Vec::from(&self.elements[..])
} else {
pad(&self.elements, width as usize, fillchar, self.len())
})
}
pub fn center(
&self,
options: ByteInnerPaddingOptions,
vm: &VirtualMachine,
) -> PyResult<Vec<u8>> {
self._pad(options, AnyStr::py_center, vm)
}
pub fn ljust(
&self,
options: ByteInnerPaddingOptions,
vm: &VirtualMachine,
) -> PyResult<Vec<u8>> {
self._pad(options, AnyStr::py_ljust, vm)
}
pub fn rjust(
&self,
options: ByteInnerPaddingOptions,
vm: &VirtualMachine,
) -> PyResult<Vec<u8>> {
self._pad(options, AnyStr::py_rjust, vm)
}
pub fn count(&self, options: ByteInnerFindOptions, vm: &VirtualMachine) -> PyResult<usize> {
let (needle, range) = options.get_value(self.elements.len(), vm)?;
Ok(self
.elements
.py_count(needle.as_slice(), range, |h, n| h.find_iter(n).count()))
}
pub fn join(
&self,
iterable: PyIterable<PyBytesInner>,
vm: &VirtualMachine,
) -> PyResult<Vec<u8>> {
let iter = iterable.iter(vm)?;
self.elements.py_join(iter)
}
#[inline]
pub fn find<F>(
&self,
options: ByteInnerFindOptions,
find: F,
vm: &VirtualMachine,
) -> PyResult<Option<usize>>
where
F: Fn(&[u8], &[u8]) -> Option<usize>,
{
let (needle, range) = options.get_value(self.elements.len(), vm)?;
Ok(self.elements.py_find(&needle, range, find))
}
pub fn maketrans(from: PyBytesInner, to: PyBytesInner, vm: &VirtualMachine) -> PyResult {
let mut res = vec![];
for i in 0..=255 {
res.push(if let Some(position) = from.elements.find_byte(i) {
to.elements[position]
} else {
i
});
}
Ok(vm.ctx.new_bytes(res))
}
pub fn translate(
&self,
options: ByteInnerTranslateOptions,
vm: &VirtualMachine,
) -> PyResult<Vec<u8>> {
let (table, delete) = options.get_value(vm)?;
let mut res = if delete.is_empty() {
Vec::with_capacity(self.elements.len())
} else {
Vec::new()
};
for i in self.elements.iter() {
if !delete.contains(i) {
res.push(table[*i as usize]);
}
}
Ok(res)
}
pub fn strip(&self, chars: OptionalOption<PyBytesInner>) -> Vec<u8> {
self.elements
.py_strip(
chars,
|s, chars| s.trim_with(|c| chars.contains(&(c as u8))),
|s| s.trim(),
)
.to_vec()
}
pub fn lstrip(&self, chars: OptionalOption<PyBytesInner>) -> Vec<u8> {
self.elements
.py_strip(
chars,
|s, chars| s.trim_start_with(|c| chars.contains(&(c as u8))),
|s| s.trim_start(),
)
.to_vec()
}
pub fn rstrip(&self, chars: OptionalOption<PyBytesInner>) -> Vec<u8> {
self.elements
.py_strip(
chars,
|s, chars| s.trim_end_with(|c| chars.contains(&(c as u8))),
|s| s.trim_end(),
)
.to_vec()
}
// new in Python 3.9
pub fn removeprefix(&self, prefix: PyBytesInner) -> Vec<u8> {
self.elements
.py_removeprefix(&prefix.elements, prefix.elements.len(), |s, p| {
s.starts_with(p)
})
.to_vec()
}
// new in Python 3.9
pub fn removesuffix(&self, suffix: PyBytesInner) -> Vec<u8> {
self.elements
.py_removesuffix(&suffix.elements, suffix.elements.len(), |s, p| {
s.ends_with(p)
})
.to_vec()
}
pub fn split<F>(
&self,
options: ByteInnerSplitOptions,
convert: F,
vm: &VirtualMachine,
) -> PyResult<PyObjectRef>
where
F: Fn(&[u8], &VirtualMachine) -> PyObjectRef,
{
let elements = self.elements.py_split(
options,
vm,
|v, s, vm| v.split_str(s).map(|v| convert(v, vm)).collect(),
|v, s, n, vm| v.splitn_str(n, s).map(|v| convert(v, vm)).collect(),
|v, n, vm| v.py_split_whitespace(n, |v| convert(v, vm)),
)?;
Ok(vm.ctx.new_list(elements))
}
pub fn rsplit<F>(
&self,
options: ByteInnerSplitOptions,
convert: F,
vm: &VirtualMachine,
) -> PyResult<PyObjectRef>
where
F: Fn(&[u8], &VirtualMachine) -> PyObjectRef,
{
let mut elements = self.elements.py_split(
options,
vm,
|v, s, vm| v.rsplit_str(s).map(|v| convert(v, vm)).collect(),
|v, s, n, vm| v.rsplitn_str(n, s).map(|v| convert(v, vm)).collect(),
|v, n, vm| v.py_rsplit_whitespace(n, |v| convert(v, vm)),
)?;
elements.reverse();
Ok(vm.ctx.new_list(elements))
}
pub fn partition(
&self,
sub: &PyBytesInner,
vm: &VirtualMachine,
) -> PyResult<(Vec<u8>, bool, Vec<u8>)> {
self.elements.py_partition(
&sub.elements,
|| self.elements.splitn_str(2, &sub.elements),
vm,
)
}
pub fn rpartition(
&self,
sub: &PyBytesInner,
vm: &VirtualMachine,
) -> PyResult<(Vec<u8>, bool, Vec<u8>)> {
self.elements.py_partition(
&sub.elements,
|| self.elements.rsplitn_str(2, &sub.elements),
vm,
)
}
pub fn expandtabs(&self, options: anystr::ExpandTabsArgs) -> Vec<u8> {
let tabsize = options.tabsize();
let mut counter: usize = 0;
let mut res = vec![];
if tabsize == 0 {
return self
.elements
.iter()
.copied()
.filter(|x| *x != b'\t')
.collect();
}
for i in &self.elements {
if *i == b'\t' {
let len = tabsize - counter % tabsize;
res.extend_from_slice(&vec![b' '; len]);
counter += len;
} else {
res.push(*i);
if *i == b'\r' || *i == b'\n' {
counter = 0;
} else {
counter += 1;
}
}
}
res
}
pub fn splitlines<FW, W>(&self, options: anystr::SplitLinesArgs, into_wrapper: FW) -> Vec<W>
where
FW: Fn(&[u8]) -> W,
{
self.elements.py_splitlines(options, into_wrapper)
}
pub fn zfill(&self, width: isize) -> Vec<u8> {
self.elements.py_zfill(width)
}
// len(self)>=1, from="", len(to)>=1, maxcount>=1
fn replace_interleave(&self, to: PyBytesInner, maxcount: Option<usize>) -> Vec<u8> {
let place_count = self.elements.len() + 1;
let count = maxcount.map_or(place_count, |v| std::cmp::min(v, place_count)) - 1;
let capacity = self.elements.len() + count * to.len();
let mut result = Vec::with_capacity(capacity);
let to_slice = to.elements.as_slice();
result.extend_from_slice(to_slice);
for c in &self.elements[..count] {
result.push(*c);
result.extend_from_slice(to_slice);
}
result.extend_from_slice(&self.elements[count..]);
result
}
fn replace_delete(&self, from: PyBytesInner, maxcount: Option<usize>) -> Vec<u8> {
let count = count_substring(self.elements.as_slice(), from.elements.as_slice(), maxcount);
if count == 0 {
// no matches
return self.elements.clone();
}
let result_len = self.len() - (count * from.len());
debug_assert!(self.len() >= count * from.len());
let mut result = Vec::with_capacity(result_len);
let mut last_end = 0;
let mut count = count;
for offset in self.elements.find_iter(&from.elements) {
result.extend_from_slice(&self.elements[last_end..offset]);
last_end = offset + from.len();
count -= 1;
if count == 0 {
break;
}
}
result.extend_from_slice(&self.elements[last_end..]);
result
}
pub fn replace_in_place(
&self,
from: PyBytesInner,
to: PyBytesInner,
maxcount: Option<usize>,
) -> Vec<u8> {
let len = from.len();
let mut iter = self.elements.find_iter(&from.elements);
let mut new = if let Some(offset) = iter.next() {
let mut new = self.elements.clone();
new[offset..offset + len].clone_from_slice(to.elements.as_slice());
if maxcount == Some(1) {
return new;
} else {
new
}
} else {
return self.elements.clone();
};
let mut count = maxcount.unwrap_or(usize::MAX) - 1;
for offset in iter {
new[offset..offset + len].clone_from_slice(to.elements.as_slice());
count -= 1;
if count == 0 {
break;
}
}
new
}
fn replace_general(
&self,
from: PyBytesInner,
to: PyBytesInner,
maxcount: Option<usize>,
vm: &VirtualMachine,
) -> PyResult<Vec<u8>> {
let count = count_substring(self.elements.as_slice(), from.elements.as_slice(), maxcount);
if count == 0 {
// no matches, return unchanged
return Ok(self.elements.clone());
}
// Check for overflow
// result_len = self_len + count * (to_len-from_len)
debug_assert!(count > 0);
if to.len() as isize - from.len() as isize
> (isize::MAX - self.elements.len() as isize) / count as isize
{
return Err(vm.new_overflow_error("replace bytes is too long".to_owned()));
}
let result_len = (self.elements.len() as isize
+ count as isize * (to.len() as isize - from.len() as isize))
as usize;
let mut result = Vec::with_capacity(result_len);
let mut last_end = 0;
let mut count = count;
for offset in self.elements.find_iter(&from.elements) {
result.extend_from_slice(&self.elements[last_end..offset]);
result.extend_from_slice(to.elements.as_slice());
last_end = offset + from.len();
count -= 1;
if count == 0 {
break;
}
}
result.extend_from_slice(&self.elements[last_end..]);
Ok(result)
}
pub fn replace(
&self,
from: PyBytesInner,
to: PyBytesInner,
maxcount: OptionalArg<isize>,
vm: &VirtualMachine,
) -> PyResult<Vec<u8>> {
// stringlib_replace in CPython
let maxcount = match maxcount {
OptionalArg::Present(maxcount) if maxcount >= 0 => {
if maxcount == 0 || self.elements.is_empty() {
// nothing to do; return the original bytes
return Ok(self.elements.clone());
}
Some(maxcount as usize)
}
_ => None,
};
// Handle zero-length special cases
if from.elements.is_empty() {
if to.elements.is_empty() {
// nothing to do; return the original bytes
return Ok(self.elements.clone());
}
// insert the 'to' bytes everywhere.
// >>> b"Python".replace(b"", b".")
// b'.P.y.t.h.o.n.'
return Ok(self.replace_interleave(to, maxcount));
}
// Except for b"".replace(b"", b"A") == b"A" there is no way beyond this
// point for an empty self bytes to generate a non-empty bytes
// Special case so the remaining code always gets a non-empty bytes
if self.elements.is_empty() {
return Ok(self.elements.clone());
}
if to.elements.is_empty() {
// delete all occurrences of 'from' bytes
Ok(self.replace_delete(from, maxcount))
} else if from.len() == to.len() {
// Handle special case where both bytes have the same length
Ok(self.replace_in_place(from, to, maxcount))
} else {
// Otherwise use the more generic algorithms
self.replace_general(from, to, maxcount, vm)
}
}
pub fn title(&self) -> Vec<u8> {
let mut res = vec![];
let mut spaced = true;
for i in self.elements.iter() {
match i {
65..=90 | 97..=122 => {
if spaced {
res.push(i.to_ascii_uppercase());
spaced = false
} else {
res.push(i.to_ascii_lowercase());
}
}
_ => {
res.push(*i);
spaced = true
}
}
}
res
}
pub fn cformat(&self, values: PyObjectRef, vm: &VirtualMachine) -> PyResult<Vec<u8>> {
CFormatBytes::parse_from_bytes(self.elements.as_slice())
.map_err(|err| vm.new_value_error(err.to_string()))?
.format(vm, values)
}
pub fn repeat(&self, n: usize) -> Vec<u8> {
self.elements.repeat(n)
}
}
pub fn try_as_bytes<F, R>(obj: PyObjectRef, f: F) -> Option<R>
where
F: Fn(&[u8]) -> R,
{
match_class!(match obj {
i @ PyBytes => Some(f(i.as_bytes())),
j @ PyByteArray => Some(f(&j.borrow_buf())),
_ => None,
})
}
#[inline]
fn count_substring(haystack: &[u8], needle: &[u8], maxcount: Option<usize>) -> usize {
let substrings = haystack.find_iter(needle);
if let Some(maxcount) = maxcount {
std::cmp::min(substrings.take(maxcount).count(), maxcount)
} else {
substrings.count()
}
}
pub trait ByteOr: ToPrimitive {
fn byte_or(&self, vm: &VirtualMachine) -> PyResult<u8> {
match self.to_u8() {
Some(value) => Ok(value),
None => Err(vm.new_value_error("byte must be in range(0, 256)".to_owned())),
}
}
}
impl ByteOr for BigInt {}