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#![deny(missing_docs_in_private_items)]
use std::{env, fmt, fs, io, path};
use std::io::Read;
use syntax::{ast, codemap};
use toml;
pub fn file_from_args(args: &[codemap::Spanned<ast::NestedMetaItemKind>])
-> Result<Option<path::PathBuf>, (&'static str, codemap::Span)> {
for arg in args.iter().filter_map(|a| a.meta_item()) {
if arg.name() == "conf_file" {
return match arg.node {
ast::MetaItemKind::Word |
ast::MetaItemKind::List(_) => Err(("`conf_file` must be a named value", arg.span)),
ast::MetaItemKind::NameValue(ref value) => {
if let ast::LitKind::Str(ref file, _) = value.node {
Ok(Some(file.to_string().into()))
} else {
Err(("`conf_file` value must be a string", value.span))
}
},
};
}
}
Ok(None)
}
#[derive(Debug)]
pub enum Error {
Io(io::Error),
Toml(Vec<toml::ParserError>),
Type(
&'static str,
&'static str,
&'static str),
UnknownKey(String),
}
impl fmt::Display for Error {
fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
match *self {
Error::Io(ref err) => err.fmt(f),
Error::Toml(ref errs) => {
let mut first = true;
for err in errs {
if !first {
try!(", ".fmt(f));
first = false;
}
try!(err.fmt(f));
}
Ok(())
},
Error::Type(key, expected, got) => {
write!(f, "`{}` is expected to be a `{}` but is a `{}`", key, expected, got)
},
Error::UnknownKey(ref key) => write!(f, "unknown key `{}`", key),
}
}
}
impl From<io::Error> for Error {
fn from(e: io::Error) -> Self {
Error::Io(e)
}
}
macro_rules! define_Conf {
($(#[$doc: meta] ($toml_name: tt, $rust_name: ident, $default: expr => $($ty: tt)+),)+) => {
pub struct Conf {
$(#[$doc] pub $rust_name: define_Conf!(TY $($ty)+),)+
}
impl Default for Conf {
fn default() -> Conf {
Conf {
$($rust_name: define_Conf!(DEFAULT $($ty)+, $default),)+
}
}
}
impl Conf {
#[allow(cast_sign_loss)]
fn set(&mut self, name: String, value: toml::Value) -> Result<(), Error> {
match name.as_str() {
$(
define_Conf!(PAT $toml_name) => {
if let Some(value) = define_Conf!(CONV $($ty)+, value) {
self.$rust_name = value;
}
else {
return Err(Error::Type(define_Conf!(EXPR $toml_name),
stringify!($($ty)+),
value.type_str()));
}
},
)+
"third-party" => {
return Ok(());
}
_ => {
return Err(Error::UnknownKey(name));
}
}
Ok(())
}
}
};
(PAT $pat: pat) => { $pat };
(EXPR $e: expr) => { $e };
(TY $ty: ty) => { $ty };
(CONV i64, $value: expr) => { $value.as_integer() };
(CONV u64, $value: expr) => {
$value.as_integer()
.iter()
.filter_map(|&i| if i >= 0 { Some(i as u64) } else { None })
.next()
};
(CONV String, $value: expr) => { $value.as_str().map(Into::into) };
(CONV Vec<String>, $value: expr) => {{
let slice = $value.as_slice();
if let Some(slice) = slice {
if slice.iter().any(|v| v.as_str().is_none()) {
None
} else {
Some(slice.iter().map(|v| v.as_str().expect("already checked").to_owned()).collect())
}
} else {
None
}
}};
(DEFAULT Vec<String>, $e: expr) => { $e.iter().map(|&e| e.to_owned()).collect() };
(DEFAULT $ty: ty, $e: expr) => { $e };
}
define_Conf! {
("blacklisted-names", blacklisted_names, ["foo", "bar", "baz", "quux"] => Vec<String>),
("cyclomatic-complexity-threshold", cyclomatic_complexity_threshold, 25 => u64),
("doc-valid-idents", doc_valid_idents, [
"MiB", "GiB", "TiB", "PiB", "EiB",
"DirectX",
"GPLv2", "GPLv3",
"GitHub",
"IPv4", "IPv6",
"JavaScript",
"NaN",
"OAuth",
"OpenGL",
"TrueType",
"iOS", "macOS",
] => Vec<String>),
("too-many-arguments-threshold", too_many_arguments_threshold, 7 => u64),
("type-complexity-threshold", type_complexity_threshold, 250 => u64),
("single-char-binding-names-threshold", max_single_char_names, 5 => u64),
("too-large-for-stack", too_large_for_stack, 200 => u64),
("enum-variant-name-threshold", enum_variant_name_threshold, 3 => u64),
}
pub fn lookup_conf_file() -> io::Result<Option<path::PathBuf>> {
const CONFIG_FILE_NAMES: [&'static str; 2] = [".clippy.toml", "clippy.toml"];
let mut current = try!(env::current_dir());
loop {
for config_file_name in &CONFIG_FILE_NAMES {
let config_file = current.join(config_file_name);
match fs::metadata(&config_file) {
Ok(ref md) if md.is_file() => return Ok(Some(config_file)),
Err(e) => {
if e.kind() != io::ErrorKind::NotFound {
return Err(e);
}
},
_ => (),
}
}
if !current.pop() {
return Ok(None);
}
}
}
pub fn read(path: Option<&path::Path>) -> (Conf, Vec<Error>) {
let mut conf = Conf::default();
let mut errors = Vec::new();
let path = if let Some(path) = path {
path
} else {
return (conf, errors);
};
let file = match fs::File::open(path) {
Ok(mut file) => {
let mut buf = String::new();
if let Err(err) = file.read_to_string(&mut buf) {
errors.push(err.into());
return (conf, errors);
}
buf
},
Err(err) => {
errors.push(err.into());
return (conf, errors);
},
};
let mut parser = toml::Parser::new(&file);
let toml = if let Some(toml) = parser.parse() {
toml
} else {
errors.push(Error::Toml(parser.errors));
return (conf, errors);
};
for (key, value) in toml {
if let Err(err) = conf.set(key, value) {
errors.push(err);
}
}
(conf, errors)
}