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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-19 00:47:55 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-19 00:47:55 +0000 |
commit | 26a029d407be480d791972afb5975cf62c9360a6 (patch) | |
tree | f435a8308119effd964b339f76abb83a57c29483 /third_party/rust/cargo-platform/src/lib.rs | |
parent | Initial commit. (diff) | |
download | firefox-26a029d407be480d791972afb5975cf62c9360a6.tar.xz firefox-26a029d407be480d791972afb5975cf62c9360a6.zip |
Adding upstream version 124.0.1.upstream/124.0.1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'third_party/rust/cargo-platform/src/lib.rs')
-rw-r--r-- | third_party/rust/cargo-platform/src/lib.rs | 146 |
1 files changed, 146 insertions, 0 deletions
diff --git a/third_party/rust/cargo-platform/src/lib.rs b/third_party/rust/cargo-platform/src/lib.rs new file mode 100644 index 0000000000..0a3dcf1af1 --- /dev/null +++ b/third_party/rust/cargo-platform/src/lib.rs @@ -0,0 +1,146 @@ +//! Platform definition used by Cargo. +//! +//! This defines a [`Platform`] type which is used in Cargo to specify a target platform. +//! There are two kinds, a named target like `x86_64-apple-darwin`, and a "cfg expression" +//! like `cfg(any(target_os = "macos", target_os = "ios"))`. +//! +//! See `examples/matches.rs` for an example of how to match against a `Platform`. +//! +//! [`Platform`]: enum.Platform.html + +use std::fmt; +use std::str::FromStr; + +mod cfg; +mod error; + +pub use cfg::{Cfg, CfgExpr}; +pub use error::{ParseError, ParseErrorKind}; + +/// Platform definition. +#[derive(Eq, PartialEq, Hash, Ord, PartialOrd, Clone, Debug)] +pub enum Platform { + /// A named platform, like `x86_64-apple-darwin`. + Name(String), + /// A cfg expression, like `cfg(windows)`. + Cfg(CfgExpr), +} + +impl Platform { + /// Returns whether the Platform matches the given target and cfg. + /// + /// The named target and cfg values should be obtained from `rustc`. + pub fn matches(&self, name: &str, cfg: &[Cfg]) -> bool { + match *self { + Platform::Name(ref p) => p == name, + Platform::Cfg(ref p) => p.matches(cfg), + } + } + + fn validate_named_platform(name: &str) -> Result<(), ParseError> { + if let Some(ch) = name + .chars() + .find(|&c| !(c.is_alphanumeric() || c == '_' || c == '-' || c == '.')) + { + if name.chars().any(|c| c == '(') { + return Err(ParseError::new( + name, + ParseErrorKind::InvalidTarget( + "unexpected `(` character, cfg expressions must start with `cfg(`" + .to_string(), + ), + )); + } + return Err(ParseError::new( + name, + ParseErrorKind::InvalidTarget(format!( + "unexpected character {} in target name", + ch + )), + )); + } + Ok(()) + } + + pub fn check_cfg_attributes(&self, warnings: &mut Vec<String>) { + fn check_cfg_expr(expr: &CfgExpr, warnings: &mut Vec<String>) { + match *expr { + CfgExpr::Not(ref e) => check_cfg_expr(e, warnings), + CfgExpr::All(ref e) | CfgExpr::Any(ref e) => { + for e in e { + check_cfg_expr(e, warnings); + } + } + CfgExpr::Value(ref e) => match e { + Cfg::Name(name) => match name.as_str() { + "test" | "debug_assertions" | "proc_macro" => + warnings.push(format!( + "Found `{}` in `target.'cfg(...)'.dependencies`. \ + This value is not supported for selecting dependencies \ + and will not work as expected. \ + To learn more visit \ + https://doc.rust-lang.org/cargo/reference/specifying-dependencies.html#platform-specific-dependencies", + name + )), + _ => (), + }, + Cfg::KeyPair(name, _) => if name.as_str() == "feature" { + warnings.push(String::from( + "Found `feature = ...` in `target.'cfg(...)'.dependencies`. \ + This key is not supported for selecting dependencies \ + and will not work as expected. \ + Use the [features] section instead: \ + https://doc.rust-lang.org/cargo/reference/features.html" + )) + }, + } + } + } + + if let Platform::Cfg(cfg) = self { + check_cfg_expr(cfg, warnings); + } + } +} + +impl serde::Serialize for Platform { + fn serialize<S>(&self, s: S) -> Result<S::Ok, S::Error> + where + S: serde::Serializer, + { + self.to_string().serialize(s) + } +} + +impl<'de> serde::Deserialize<'de> for Platform { + fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> + where + D: serde::Deserializer<'de>, + { + let s = String::deserialize(deserializer)?; + FromStr::from_str(&s).map_err(serde::de::Error::custom) + } +} + +impl FromStr for Platform { + type Err = ParseError; + + fn from_str(s: &str) -> Result<Platform, ParseError> { + if s.starts_with("cfg(") && s.ends_with(')') { + let s = &s[4..s.len() - 1]; + s.parse().map(Platform::Cfg) + } else { + Platform::validate_named_platform(s)?; + Ok(Platform::Name(s.to_string())) + } + } +} + +impl fmt::Display for Platform { + fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { + match *self { + Platform::Name(ref n) => n.fmt(f), + Platform::Cfg(ref e) => write!(f, "cfg({})", e), + } + } +} |