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//! Parsing functions for various type of configuration values.
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//!
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//! Returning `None` indicates a syntax error. Using a `Result` would be more
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//! correct but would take more boilerplate for converting between error types,
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//! compared to using `.ok()` on inner results of various error types to
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//! convert them all to options. The `Config::get_parse` method later converts
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//! those options to results with `ConfigValueParseError`, which contains
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//! details about where the value came from (but omits details of what’s
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//! invalid inside the value).
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use crate::utils::SliceExt;
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pub(super) fn parse_bool(v: &[u8]) -> Option<bool> {
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match v.to_ascii_lowercase().as_slice() {
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b"1" | b"yes" | b"true" | b"on" | b"always" => Some(true),
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b"0" | b"no" | b"false" | b"off" | b"never" => Some(false),
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_ => None,
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}
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}
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pub(super) fn parse_byte_size(value: &[u8]) -> Option<u64> {
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let value = std::str::from_utf8(value).ok()?.to_ascii_lowercase();
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const UNITS: &[(&str, u64)] = &[
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("g", 1 << 30),
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("gb", 1 << 30),
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("m", 1 << 20),
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("mb", 1 << 20),
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("k", 1 << 10),
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("kb", 1 << 10),
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("b", 1 << 0), // Needs to be last
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];
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for &(unit, multiplier) in UNITS {
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if let Some(value) = value.strip_suffix(unit) {
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let float: f64 = value.trim().parse().ok()?;
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if float >= 0.0 {
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return Some((float * multiplier as f64).round() as u64);
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} else {
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return None;
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}
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}
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}
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value.parse().ok()
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}
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/// Parse a config value as a list of sub-values.
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///
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/// Ported from `parselist` in `mercurial/utils/stringutil.py`
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// Note: keep behavior in sync with the Python one.
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// Note: this could return `Vec<Cow<[u8]>>` instead and borrow `input` when
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// possible (when there’s no backslash-escapes) but this is probably not worth
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// the complexity as config is presumably not accessed inside
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// preformance-sensitive loops.
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pub(super) fn parse_list(input: &[u8]) -> Vec<Vec<u8>> {
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// Port of Python’s `value.lstrip(b' ,\n')`
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// TODO: is this really what we want?
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let input =
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input.trim_start_matches(|b| b == b' ' || b == b',' || b == b'\n');
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parse_list_without_trim_start(input)
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}
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fn parse_list_without_trim_start(input: &[u8]) -> Vec<Vec<u8>> {
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// Start of port of Python’s `_configlist`
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let input = input.trim_end_matches(|b| b == b' ' || b == b',');
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if input.is_empty() {
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return Vec::new();
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}
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// Just to make “a string” less confusable with “a list of strings”.
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type ByteString = Vec<u8>;
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// These correspond to Python’s…
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let mut mode = ParserMode::Plain; // `parser`
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let mut values = Vec::new(); // `parts[:-1]`
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let mut next_value = ByteString::new(); // `parts[-1]`
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let mut offset = 0; // `offset`
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// Setting `parser` to `None` is instead handled by returning immediately
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enum ParserMode {
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Plain,
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Quoted,
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}
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loop {
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match mode {
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ParserMode::Plain => {
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// Start of port of Python’s `_parse_plain`
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let mut whitespace = false;
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while let Some(&byte) = input.get(offset) {
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if is_space(byte) || byte == b',' {
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whitespace = true;
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offset += 1;
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} else {
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break;
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}
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}
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if let Some(&byte) = input.get(offset) {
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if whitespace {
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values.push(std::mem::take(&mut next_value))
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}
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if byte == b'"' && next_value.is_empty() {
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mode = ParserMode::Quoted;
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} else {
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if byte == b'"' && next_value.ends_with(b"\\") {
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next_value.pop();
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}
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next_value.push(byte);
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}
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offset += 1;
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} else {
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values.push(next_value);
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return values;
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}
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}
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ParserMode::Quoted => {
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// Start of port of Python’s `_parse_quote`
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if let Some(&byte) = input.get(offset) {
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if byte == b'"' {
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// The input contains a quoted zero-length value `""`
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debug_assert_eq!(next_value, b"");
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values.push(std::mem::take(&mut next_value));
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offset += 1;
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while let Some(&byte) = input.get(offset) {
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if is_space(byte) || byte == b',' {
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offset += 1;
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} else {
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break;
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}
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}
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mode = ParserMode::Plain;
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continue;
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}
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}
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while let Some(&byte) = input.get(offset) {
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if byte == b'"' {
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break;
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}
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if byte == b'\\' && input.get(offset + 1) == Some(&b'"') {
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next_value.push(b'"');
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offset += 2;
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} else {
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next_value.push(byte);
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offset += 1;
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}
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}
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if offset >= input.len() {
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// We didn’t find a closing double-quote,
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// so treat the opening one as part of an unquoted value
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// instead of delimiting the start of a quoted value.
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// `next_value` may have had some backslash-escapes
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// unescaped. TODO: shouldn’t we use a slice of `input`
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// instead?
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let mut real_values =
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parse_list_without_trim_start(&next_value);
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if let Some(first) = real_values.first_mut() {
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first.insert(0, b'"');
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// Drop `next_value`
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values.extend(real_values)
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} else {
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next_value.push(b'"');
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values.push(next_value);
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}
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return values;
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}
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// We’re not at the end of the input, which means the `while`
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// loop above ended at at double quote. Skip
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// over that.
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offset += 1;
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while let Some(&byte) = input.get(offset) {
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if byte == b' ' || byte == b',' {
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offset += 1;
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} else {
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break;
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}
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}
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if offset >= input.len() {
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values.push(next_value);
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return values;
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}
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if offset + 1 == input.len() && input[offset] == b'"' {
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next_value.push(b'"');
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offset += 1;
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} else {
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values.push(std::mem::take(&mut next_value));
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}
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mode = ParserMode::Plain;
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}
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}
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}
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// https://docs.python.org/3/library/stdtypes.html?#bytes.isspace
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fn is_space(byte: u8) -> bool {
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matches!(byte, b' ' | b'\t' | b'\n' | b'\r' | b'\x0b' | b'\x0c')
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}
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}
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#[test]
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fn test_parse_list() {
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// Make `assert_eq` error messages nicer
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fn as_strings(values: &[Vec<u8>]) -> Vec<String> {
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values
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.iter()
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.map(|v| std::str::from_utf8(v.as_ref()).unwrap().to_owned())
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.collect()
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}
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macro_rules! assert_parse_list {
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( $input: expr => [ $( $output: expr ),* ] ) => {
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assert_eq!(
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as_strings(&parse_list($input)),
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as_strings(&[ $( Vec::from(&$output[..]) ),* ]),
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);
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}
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}
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// Keep these Rust tests in sync with the Python ones in
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// `tests/test-config-parselist.py`
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assert_parse_list!(b"" => []);
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assert_parse_list!(b"," => []);
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assert_parse_list!(b"A" => [b"A"]);
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assert_parse_list!(b"B,B" => [b"B", b"B"]);
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assert_parse_list!(b", C, ,C," => [b"C", b"C"]);
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assert_parse_list!(b"\"" => [b"\""]);
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assert_parse_list!(b"\"\"" => [b"", b""]);
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assert_parse_list!(b"D,\"" => [b"D", b"\""]);
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assert_parse_list!(b"E,\"\"" => [b"E", b"", b""]);
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assert_parse_list!(b"\"F,F\"" => [b"F,F"]);
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assert_parse_list!(b"\"G,G" => [b"\"G", b"G"]);
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assert_parse_list!(b"\"H \\\",\\\"H" => [b"\"H", b",", b"H"]);
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assert_parse_list!(b"I,I\"" => [b"I", b"I\""]);
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assert_parse_list!(b"J,\"J" => [b"J", b"\"J"]);
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assert_parse_list!(b"K K" => [b"K", b"K"]);
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assert_parse_list!(b"\"K\" K" => [b"K", b"K"]);
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assert_parse_list!(b"L\tL" => [b"L", b"L"]);
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assert_parse_list!(b"\"L\"\tL" => [b"L", b"", b"L"]);
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assert_parse_list!(b"M\x0bM" => [b"M", b"M"]);
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assert_parse_list!(b"\"M\"\x0bM" => [b"M", b"", b"M"]);
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assert_parse_list!(b"\"N\" , ,\"" => [b"N\""]);
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assert_parse_list!(b"\" ,O, " => [b"\"", b"O"]);
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}
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#[test]
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fn test_parse_byte_size() {
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assert_eq!(parse_byte_size(b""), None);
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assert_eq!(parse_byte_size(b"b"), None);
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assert_eq!(parse_byte_size(b"12"), Some(12));
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assert_eq!(parse_byte_size(b"12b"), Some(12));
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assert_eq!(parse_byte_size(b"12 b"), Some(12));
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assert_eq!(parse_byte_size(b"12.1 b"), Some(12));
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assert_eq!(parse_byte_size(b"1.1 K"), Some(1126));
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assert_eq!(parse_byte_size(b"1.1 kB"), Some(1126));
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assert_eq!(parse_byte_size(b"-12 b"), None);
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assert_eq!(parse_byte_size(b"-0.1 b"), None);
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assert_eq!(parse_byte_size(b"0.1 b"), Some(0));
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assert_eq!(parse_byte_size(b"12.1 b"), Some(12));
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}
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