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head: remove a clippy::cognitive_complexity by moving some content in a function #5366

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merged 2 commits into from
Oct 7, 2023
Merged

head: remove a clippy::cognitive_complexity by moving some content in a function #5366

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wc: remove a clippy::cognitive_complexity by moving some content into…
sylvestre Oct 6, 2023
929cdc3
Remove duplicate comment
sylvestre Oct 7, 2023
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129 changes: 69 additions & 60 deletions src/uu/head/src/parse.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -13,7 +13,6 @@ pub enum ParseError {
}
/// Parses obsolete syntax
/// head -NUM\[kmzv\] // spell-checker:disable-line
#[allow(clippy::cognitive_complexity)]
pub fn parse_obsolete(src: &str) -> Option<Result<impl Iterator<Item = OsString>, ParseError>> {
let mut chars = src.char_indices();
if let Some((_, '-')) = chars.next() {
Expand All @@ -30,72 +29,82 @@ pub fn parse_obsolete(src: &str) -> Option<Result<impl Iterator<Item = OsString>
}
}
if has_num {
match src[1..=num_end].parse::<usize>() {
Ok(num) => {
let mut quiet = false;
let mut verbose = false;
let mut zero_terminated = false;
let mut multiplier = None;
let mut c = last_char;
loop {
// not that here, we only match lower case 'k', 'c', and 'm'
match c {
// we want to preserve order
// this also saves us 1 heap allocation
'q' => {
quiet = true;
verbose = false;
}
'v' => {
verbose = true;
quiet = false;
}
'z' => zero_terminated = true,
'c' => multiplier = Some(1),
'b' => multiplier = Some(512),
'k' => multiplier = Some(1024),
'm' => multiplier = Some(1024 * 1024),
'\0' => {}
_ => return Some(Err(ParseError::Syntax)),
}
if let Some((_, next)) = chars.next() {
c = next;
} else {
break;
}
}
let mut options = Vec::new();
if quiet {
options.push(OsString::from("-q"));
}
if verbose {
options.push(OsString::from("-v"));
}
if zero_terminated {
options.push(OsString::from("-z"));
}
if let Some(n) = multiplier {
options.push(OsString::from("-c"));
let num = match num.checked_mul(n) {
Some(n) => n,
None => return Some(Err(ParseError::Overflow)),
};
options.push(OsString::from(format!("{num}")));
} else {
options.push(OsString::from("-n"));
options.push(OsString::from(format!("{num}")));
}
Some(Ok(options.into_iter()))
}
Err(_) => Some(Err(ParseError::Overflow)),
}
process_num_block(&src[1..=num_end], last_char, &mut chars)
} else {
None
}
} else {
None
}
}

/// Processes the numeric block of the input string to generate the appropriate options.
fn process_num_block(
src: &str,
last_char: char,
chars: &mut std::str::CharIndices,
) -> Option<Result<impl Iterator<Item = OsString>, ParseError>> {
match src.parse::<usize>() {
Ok(num) => {
let mut quiet = false;
let mut verbose = false;
let mut zero_terminated = false;
let mut multiplier = None;
let mut c = last_char;
loop {
// note that here, we only match lower case 'k', 'c', and 'm'
match c {
// we want to preserve order
// this also saves us 1 heap allocation
'q' => {
quiet = true;
verbose = false;
}
'v' => {
verbose = true;
quiet = false;
}
'z' => zero_terminated = true,
'c' => multiplier = Some(1),
'b' => multiplier = Some(512),
'k' => multiplier = Some(1024),
'm' => multiplier = Some(1024 * 1024),
'\0' => {}
_ => return Some(Err(ParseError::Syntax)),
}
if let Some((_, next)) = chars.next() {
c = next;
} else {
break;
}
}
let mut options = Vec::new();
if quiet {
options.push(OsString::from("-q"));
}
if verbose {
options.push(OsString::from("-v"));
}
if zero_terminated {
options.push(OsString::from("-z"));
}
if let Some(n) = multiplier {
options.push(OsString::from("-c"));
let num = match num.checked_mul(n) {
Some(n) => n,
None => return Some(Err(ParseError::Overflow)),
};
options.push(OsString::from(format!("{num}")));
} else {
options.push(OsString::from("-n"));
options.push(OsString::from(format!("{num}")));
}
Some(Ok(options.into_iter()))
}
Err(_) => Some(Err(ParseError::Overflow)),
}
}

/// Parses an -c or -n argument,
/// the bool specifies whether to read from the end
pub fn parse_num(src: &str) -> Result<(u64, bool), ParseSizeError> {
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