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Diffstat (limited to '')
-rw-r--r-- | third_party/rust/clap_builder/src/util/str_to_bool.rs | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/third_party/rust/clap_builder/src/util/str_to_bool.rs b/third_party/rust/clap_builder/src/util/str_to_bool.rs new file mode 100644 index 0000000000..1fbdc7531a --- /dev/null +++ b/third_party/rust/clap_builder/src/util/str_to_bool.rs @@ -0,0 +1,21 @@ +/// True values are `y`, `yes`, `t`, `true`, `on`, and `1`. +pub(crate) const TRUE_LITERALS: [&str; 6] = ["y", "yes", "t", "true", "on", "1"]; + +/// False values are `n`, `no`, `f`, `false`, `off`, and `0`. +pub(crate) const FALSE_LITERALS: [&str; 6] = ["n", "no", "f", "false", "off", "0"]; + +/// Converts a string literal representation of truth to true or false. +/// +/// `false` values are `n`, `no`, `f`, `false`, `off`, and `0` (case insensitive). +/// +/// Any other value will be considered as `true`. +pub(crate) fn str_to_bool(val: impl AsRef<str>) -> Option<bool> { + let pat: &str = &val.as_ref().to_lowercase(); + if TRUE_LITERALS.contains(&pat) { + Some(true) + } else if FALSE_LITERALS.contains(&pat) { + Some(false) + } else { + None + } +} |