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Make SizeFormat lenient, and add tests

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This changes the SizeFormat option parser from its old, strict-by-default behaviour (where passing both --bytes and --binary would be an error) to the new, use-the-last-argument behaviour (where passing --bytes --binary would use --binary because it came later).

Doing this meant adding functionality to Matches so that it could return *which* argument matched. Previously, the order of --bytes and --binary didn’t matter, because they couldn’t both be present, but now it does.
This commit is contained in:
Benjamin Sago 2017-08-09 19:18:31 +01:00
parent b2947ed590
commit 6b309d5cfc
2 changed files with 64 additions and 42 deletions
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60
src/options/parser.rs
View File

@ -314,47 +314,57 @@ pub struct MatchedFlags<'args> {
strictness: Strictness,
}
use self::Strictness::*;
impl<'a> MatchedFlags<'a> {
/// Whether the given argument was specified.
/// Returns `true` if it was, `false` if it wasn’t, and an error in
/// strict mode if it was specified more than once.
pub fn has(&self, arg: &'static Arg) -> Result<bool, Misfire> {
match self.strictness {
UseLastArguments => {
let any = self.flags.iter().rev()
.find(|tuple| tuple.1.is_none() && tuple.0.matches(arg))
.is_some();
Ok(any)
self.has_where(|flag| flag.matches(arg)).map(|flag| flag.is_some())
}
ComplainAboutRedundantArguments => {
/// Returns the first found argument that satisfies the predicate, or
/// nothing if none is found, or an error in strict mode if multiple
/// argument satisfy the predicate.
///
/// You’ll have to test the resulting flag to see which argument it was.
pub fn has_where<P>(&self, predicate: P) -> Result<Option<&Flag>, Misfire>
where P: Fn(&Flag) -> bool {
if self.is_strict() {
let all = self.flags.iter()
.filter(|tuple| tuple.1.is_none() && tuple.0.matches(arg))
.filter(|tuple| tuple.1.is_none() && predicate(&tuple.0))
.collect::<Vec<_>>();
if all.len() < 2 { Ok(all.len() == 1) }
else { Err(Misfire::Conflict(arg, arg)) }
if all.len() < 2 { Ok(all.first().map(|t| &t.0)) }
else { Err(Misfire::Duplicate(all[0].0.clone(), all[1].0.clone())) }
}
else {
let any = self.flags.iter().rev()
.find(|tuple| tuple.1.is_none() && predicate(&tuple.0))
.map(|tuple| &tuple.0);
Ok(any)
}
}
// This code could probably be better.
// Both ‘has’ and ‘get’ immediately begin with a conditional, which makes
// me think the functionality could be moved to inside Strictness.
/// Returns the value of the given argument if it was specified, nothing
/// if it wasn’t, and an error in strict mode if it was specified more
/// than once.
pub fn get(&self, arg: &'static Arg) -> Result<Option<&OsStr>, Misfire> {
self.get_where(|flag| flag.matches(arg))
}
/// If the given argument was specified, return its value.
/// The value is not guaranteed to be valid UTF-8.
/// Returns the value of the argument that matches the predicate if it
/// was specified, nothing if it wasn't, and an error in strict mode if
/// multiple arguments matched the predicate.
///
/// It’s not possible to tell which flag the value belonged to from this.
pub fn get_where<P>(&self, predicate: P) -> Result<Option<&OsStr>, Misfire>
where P: Fn(&Flag) -> bool {
match self.strictness {
UseLastArguments => {
let found = self.flags.iter().rev()
.find(|tuple| tuple.1.is_some() && predicate(&tuple.0))
.map(|tuple| tuple.1.unwrap());
Ok(found)
}
ComplainAboutRedundantArguments => {
if self.is_strict() {
let those = self.flags.iter()
.filter(|tuple| tuple.1.is_some() && predicate(&tuple.0))
.collect::<Vec<_>>();
@ -362,13 +372,19 @@ impl<'a> MatchedFlags<'a> {
if those.len() < 2 { Ok(those.first().cloned().map(|t| t.1.unwrap())) }
else { Err(Misfire::Duplicate(those[0].0.clone(), those[1].0.clone())) }
}
else {
let found = self.flags.iter().rev()
.find(|tuple| tuple.1.is_some() && predicate(&tuple.0))
.map(|tuple| tuple.1.unwrap());
Ok(found)
}
}
// It’s annoying that ‘has’ and ‘get’ won’t work when accidentally given
// flags that do/don’t take values, but this should be caught by tests.
/// Counts the number of occurrences of the given argument.
/// Counts the number of occurrences of the given argument, even in
/// strict mode.
pub fn count(&self, arg: &Arg) -> usize {
self.flags.iter()
.filter(|tuple| tuple.0.matches(arg))

26
src/options/view.rs
View File

@ -206,15 +206,13 @@ impl SizeFormat {
/// involves the `--binary` or `--bytes` flags, and these conflict with
/// each other.
fn deduce(matches: &MatchedFlags) -> Result<SizeFormat, Misfire> {
let binary = matches.has(&flags::BINARY)?;
let bytes = matches.has(&flags::BYTES)?;
let flag = matches.has_where(|f| f.matches(&flags::BINARY) || f.matches(&flags::BYTES))?;
match (binary, bytes) {
(true, true ) => Err(Misfire::Conflict(&flags::BINARY, &flags::BYTES)),
(true, false) => Ok(SizeFormat::BinaryBytes),
(false, true ) => Ok(SizeFormat::JustBytes),
(false, false) => Ok(SizeFormat::DecimalBytes),
}
Ok(match flag {
Some(f) if f.matches(&flags::BINARY) => SizeFormat::BinaryBytes,
Some(f) if f.matches(&flags::BYTES) => SizeFormat::JustBytes,
_ => SizeFormat::DecimalBytes,
})
}
}
@ -463,8 +461,16 @@ mod test {
test!(binary: SizeFormat <- ["--binary"]; Both => Ok(SizeFormat::BinaryBytes));
test!(bytes: SizeFormat <- ["--bytes"]; Both => Ok(SizeFormat::JustBytes));
// Errors
test!(both: SizeFormat <- ["--binary", "--bytes"]; Both => Err(Misfire::Conflict(&flags::BINARY, &flags::BYTES)));
// Overriding
test!(both_1: SizeFormat <- ["--binary", "--binary"]; Last => Ok(SizeFormat::BinaryBytes));
test!(both_2: SizeFormat <- ["--bytes", "--binary"]; Last => Ok(SizeFormat::BinaryBytes));
test!(both_3: SizeFormat <- ["--binary", "--bytes"]; Last => Ok(SizeFormat::JustBytes));
test!(both_4: SizeFormat <- ["--bytes", "--bytes"]; Last => Ok(SizeFormat::JustBytes));
test!(both_5: SizeFormat <- ["--binary", "--binary"]; Complain => Err(Misfire::Duplicate(Flag::Long("binary"), Flag::Long("binary"))));
test!(both_6: SizeFormat <- ["--bytes", "--binary"]; Complain => Err(Misfire::Duplicate(Flag::Long("bytes"), Flag::Long("binary"))));
test!(both_7: SizeFormat <- ["--binary", "--bytes"]; Complain => Err(Misfire::Duplicate(Flag::Long("binary"), Flag::Long("bytes"))));
test!(both_8: SizeFormat <- ["--bytes", "--bytes"]; Complain => Err(Misfire::Duplicate(Flag::Long("bytes"), Flag::Long("bytes"))));
}