1 //! Parsing of CfgFlags as command line arguments, as in
3 //! rustc main.rs --cfg foo --cfg 'feature="bar"'
4 use std::{fmt, str::FromStr};
8 #[derive(Clone, Eq, PartialEq, Debug)]
11 KeyValue { key: String, value: String },
14 impl FromStr for CfgFlag {
16 fn from_str(s: &str) -> Result<Self, Self::Err> {
17 let res = match s.split_once('=') {
18 Some((key, value)) => {
19 if !(value.starts_with('"') && value.ends_with('"')) {
20 return Err(format!("Invalid cfg ({:?}), value should be in quotes", s));
22 let key = key.to_string();
23 let value = value[1..value.len() - 1].to_string();
24 CfgFlag::KeyValue { key, value }
26 None => CfgFlag::Atom(s.into()),
32 impl<'de> serde::Deserialize<'de> for CfgFlag {
33 fn deserialize<D>(deserializer: D) -> Result<Self, D::Error>
35 D: serde::Deserializer<'de>,
37 String::deserialize(deserializer)?.parse().map_err(serde::de::Error::custom)
41 impl Extend<CfgFlag> for CfgOptions {
42 fn extend<T: IntoIterator<Item = CfgFlag>>(&mut self, iter: T) {
43 for cfg_flag in iter {
45 CfgFlag::Atom(it) => self.insert_atom(it.into()),
46 CfgFlag::KeyValue { key, value } => self.insert_key_value(key.into(), value.into()),
52 impl fmt::Display for CfgFlag {
53 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
55 CfgFlag::Atom(atom) => f.write_str(atom),
56 CfgFlag::KeyValue { key, value } => {