1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
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),
}
}
}
|
