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https://github.com/uutils/coreutils
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head: remove clippy::cognitive_complexity by moving some content in a function (#5366)
* head: remove a clippy::cognitive_complexity by moving some content into a function * Remove duplicate comment
This commit is contained in:
Sylvestre Ledru
GitHub
parent
91c8724fd5
commit
3e1d3caceb
1 changed files with 69 additions and 60 deletions
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@ -13,7 +13,6 @@ pub enum ParseError {
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}
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}
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/// Parses obsolete syntax
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/// Parses obsolete syntax
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/// head -NUM\[kmzv\] // spell-checker:disable-line
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/// head -NUM\[kmzv\] // spell-checker:disable-line
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#[allow(clippy::cognitive_complexity)]
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pub fn parse_obsolete(src: &str) -> Option<Result<impl Iterator<Item = OsString>, ParseError>> {
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pub fn parse_obsolete(src: &str) -> Option<Result<impl Iterator<Item = OsString>, ParseError>> {
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let mut chars = src.char_indices();
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let mut chars = src.char_indices();
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if let Some((_, '-')) = chars.next() {
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if let Some((_, '-')) = chars.next() {
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@ -30,65 +29,7 @@ pub fn parse_obsolete(src: &str) -> Option<Result<impl Iterator<Item = OsString>
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}
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}
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}
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}
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if has_num {
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if has_num {
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match src[1..=num_end].parse::<usize>() {
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process_num_block(&src[1..=num_end], last_char, &mut chars)
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Ok(num) => {
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let mut quiet = false;
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let mut verbose = false;
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let mut zero_terminated = false;
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let mut multiplier = None;
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let mut c = last_char;
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loop {
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// not that here, we only match lower case 'k', 'c', and 'm'
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match c {
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// we want to preserve order
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// this also saves us 1 heap allocation
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'q' => {
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quiet = true;
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verbose = false;
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}
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'v' => {
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verbose = true;
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quiet = false;
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}
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'z' => zero_terminated = true,
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'c' => multiplier = Some(1),
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'b' => multiplier = Some(512),
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'k' => multiplier = Some(1024),
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'm' => multiplier = Some(1024 * 1024),
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'\0' => {}
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_ => return Some(Err(ParseError::Syntax)),
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}
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if let Some((_, next)) = chars.next() {
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c = next;
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} else {
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break;
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}
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}
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let mut options = Vec::new();
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if quiet {
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options.push(OsString::from("-q"));
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}
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if verbose {
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options.push(OsString::from("-v"));
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}
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if zero_terminated {
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options.push(OsString::from("-z"));
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}
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if let Some(n) = multiplier {
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options.push(OsString::from("-c"));
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let num = match num.checked_mul(n) {
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Some(n) => n,
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None => return Some(Err(ParseError::Overflow)),
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};
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options.push(OsString::from(format!("{num}")));
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} else {
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options.push(OsString::from("-n"));
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options.push(OsString::from(format!("{num}")));
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}
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Some(Ok(options.into_iter()))
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}
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Err(_) => Some(Err(ParseError::Overflow)),
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}
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} else {
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} else {
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None
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None
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}
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}
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@ -96,6 +37,74 @@ pub fn parse_obsolete(src: &str) -> Option<Result<impl Iterator<Item = OsString>
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None
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None
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}
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}
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}
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}
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/// Processes the numeric block of the input string to generate the appropriate options.
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fn process_num_block(
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src: &str,
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last_char: char,
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chars: &mut std::str::CharIndices,
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) -> Option<Result<impl Iterator<Item = OsString>, ParseError>> {
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match src.parse::<usize>() {
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Ok(num) => {
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let mut quiet = false;
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let mut verbose = false;
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let mut zero_terminated = false;
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let mut multiplier = None;
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let mut c = last_char;
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loop {
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// note that here, we only match lower case 'k', 'c', and 'm'
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match c {
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// we want to preserve order
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// this also saves us 1 heap allocation
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'q' => {
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quiet = true;
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verbose = false;
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}
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'v' => {
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verbose = true;
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quiet = false;
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}
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'z' => zero_terminated = true,
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'c' => multiplier = Some(1),
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'b' => multiplier = Some(512),
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'k' => multiplier = Some(1024),
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'm' => multiplier = Some(1024 * 1024),
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'\0' => {}
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_ => return Some(Err(ParseError::Syntax)),
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}
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if let Some((_, next)) = chars.next() {
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c = next;
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} else {
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break;
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}
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}
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let mut options = Vec::new();
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if quiet {
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options.push(OsString::from("-q"));
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}
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if verbose {
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options.push(OsString::from("-v"));
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}
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if zero_terminated {
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options.push(OsString::from("-z"));
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}
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if let Some(n) = multiplier {
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options.push(OsString::from("-c"));
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let num = match num.checked_mul(n) {
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Some(n) => n,
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None => return Some(Err(ParseError::Overflow)),
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};
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options.push(OsString::from(format!("{num}")));
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} else {
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options.push(OsString::from("-n"));
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options.push(OsString::from(format!("{num}")));
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}
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Some(Ok(options.into_iter()))
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}
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Err(_) => Some(Err(ParseError::Overflow)),
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}
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}
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/// Parses an -c or -n argument,
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/// Parses an -c or -n argument,
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/// the bool specifies whether to read from the end
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/// the bool specifies whether to read from the end
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pub fn parse_num(src: &str) -> Result<(u64, bool), ParseSizeError> {
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pub fn parse_num(src: &str) -> Result<(u64, bool), ParseSizeError> {
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