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use std::cmp;
use std::path;
use std::rc::Rc;
use core::{IndexedSource, Session, SessionExt, Location, LocationExt, Point};
use core::SearchType::{self, ExactMatch, StartsWith};
#[cfg(unix)]
pub const PATH_SEP: char = ':';
#[cfg(windows)]
pub const PATH_SEP: char = ';';
pub fn is_pattern_char(c: char) -> bool {
c.is_alphanumeric() || c.is_whitespace() || (c == '_') || (c == ':') || (c == '.')
}
pub fn is_search_expr_char(c: char) -> bool {
c.is_alphanumeric() || (c == '_') || (c == ':') || (c == '.')
}
pub fn is_ident_char(c: char) -> bool {
c.is_alphanumeric() || (c == '_') || (c == '!')
}
pub fn txt_matches(stype: SearchType, needle: &str, haystack: &str) -> bool {
match stype {
ExactMatch => {
let n_len = needle.len();
let h_len = haystack.len();
if n_len == 0 {
return true;
}
let mut n=0;
while let Some(n1) = haystack[n..].find(needle) {
n += n1;
if (n == 0 || !is_ident_char(char_at(haystack, n-1))) &&
(n+n_len == h_len || !is_ident_char(char_at(haystack, n+n_len))) {
return true;
}
n += 1;
}
false
},
StartsWith => {
if needle.is_empty() {
return true;
}
let mut n=0;
while let Some(n1) = haystack[n..].find(needle) {
n += n1;
if n == 0 || !is_ident_char(char_at(haystack, n-1)) {
return true;
}
n += 1;
}
false
}
}
}
pub fn symbol_matches(stype: SearchType, searchstr: &str, candidate: &str) -> bool {
match stype {
ExactMatch => searchstr == candidate,
StartsWith => candidate.starts_with(searchstr)
}
}
pub fn closure_valid_arg_scope(scope_src: &str) -> Option<(usize, usize, &str)> {
let left_pipe = if let Some(pos) = scope_src.find('|') { pos } else { return None; };
let rest_scope = &scope_src[left_pipe + 1..];
let right_pipe = if let Some(pos) = rest_scope.find('|') {
left_pipe + 1 + pos
} else {
return None;
};
let pipe_scope = &scope_src[left_pipe..right_pipe+1];
let curly_brackets = pipe_scope.chars().fold(0,
|count, c| {
if c == '{' {
count + 1
} else if c == '}' {
count - 1
} else {
count
}
});
if curly_brackets != 0 {
return None;
}
if pipe_scope.contains(';') {
return None;
}
Some((left_pipe, right_pipe, pipe_scope))
}
#[test]
fn txt_matches_matches_stuff() {
assert_eq!(true, txt_matches(ExactMatch, "Vec","Vec"));
assert_eq!(true, txt_matches(StartsWith, "Vec","Vector"));
assert_eq!(false, txt_matches(ExactMatch, "Vec","use Vector"));
assert_eq!(true, txt_matches(StartsWith, "Vec","use Vector"));
assert_eq!(false, txt_matches(StartsWith, "Vec","use aVector"));
assert_eq!(true, txt_matches(ExactMatch, "Vec","use Vec"));
}
#[test]
fn txt_matches_matches_methods() {
assert_eq!(true, txt_matches(StartsWith, "do_st", "fn do_stuff"));
assert_eq!(true, txt_matches(StartsWith, "do_st", "pub fn do_stuff"));
assert_eq!(true, txt_matches(StartsWith, "do_st", "pub(crate) fn do_stuff"));
assert_eq!(true, txt_matches(StartsWith, "do_st", "pub(in codegen) fn do_stuff"));
}
pub fn expand_ident<P, C>(
filepath: P,
cursor: C,
session: &Session
) -> Option<ExpandedIdent>
where P: AsRef<::std::path::Path>,
C: Into<Location>
{
let cursor = cursor.into();
let indexed_source = session.load_file(filepath.as_ref());
let (start, pos) = {
let s = &indexed_source.code[..];
let pos = match cursor.to_point(&indexed_source) {
Some(pos) => pos,
None => {
debug!("Failed to convert cursor to point");
return None;
}
};
let pos = cmp::min(s.len(), pos);
let sb = &s[..pos];
let mut start = pos;
for (i, c) in sb.char_indices().rev() {
if !is_ident_char(c) {
break;
}
start = i;
}
(start, pos)
};
Some(ExpandedIdent {
src: indexed_source,
start: start,
pos: pos,
})
}
pub struct ExpandedIdent {
src: Rc<IndexedSource>,
start: Point,
pos: Point,
}
impl ExpandedIdent {
pub fn ident(&self) -> &str {
&self.src.code[self.start..self.pos]
}
pub fn start(&self) -> Point {
self.start
}
pub fn pos(&self) -> Point {
self.pos
}
}
pub fn find_ident_end(s: &str, pos: Point) -> Point {
let sa = &s[pos..];
for (i, c) in sa.char_indices() {
if !is_ident_char(c) {
return pos + i;
}
}
s.len()
}
#[test]
fn find_ident_end_ascii() {
assert_eq!(5, find_ident_end("ident", 0));
assert_eq!(6, find_ident_end("(ident)", 1));
assert_eq!(17, find_ident_end("let an_identifier = 100;", 4));
}
#[test]
fn find_ident_end_unicode() {
assert_eq!(7, find_ident_end("num_µs", 0));
assert_eq!(10, find_ident_end("ends_in_µ", 0));
}
pub fn char_at(src: &str, i: usize) -> char {
src[i..].chars().next().unwrap()
}
#[derive(Debug, PartialEq)]
pub enum RustSrcPathError {
Missing,
DoesNotExist(path::PathBuf),
NotRustSourceTree(path::PathBuf),
}
impl ::std::error::Error for RustSrcPathError {
fn cause(&self) -> Option<&::std::error::Error> {
None
}
fn description(&self) -> &str {
match *self {
RustSrcPathError::Missing => "RUSTC_SRC_PATH not set or not found in sysroot",
RustSrcPathError::DoesNotExist(_) => "RUSTC_SRC_PATH does not exist on file system",
RustSrcPathError::NotRustSourceTree(_) => "RUSTC_SRC_PATH isn't a rustc source tree",
}
}
}
impl ::std::fmt::Display for RustSrcPathError {
fn fmt(&self, f: &mut ::std::fmt::Formatter) -> ::std::fmt::Result {
match *self {
RustSrcPathError::Missing => {
write!(f, "RUST_SRC_PATH environment variable must be set to \
point to the src directory of a rust checkout. \
E.g. \"/home/foouser/src/rust/src\"")
},
RustSrcPathError::DoesNotExist(ref path) => {
write!(f, "racer can't find the directory pointed to by the \
RUST_SRC_PATH variable \"{:?}\". Try using an \
absolute fully qualified path and make sure it \
points to the src directory of a rust checkout - \
e.g. \"/home/foouser/src/rust/src\".", path)
},
RustSrcPathError::NotRustSourceTree(ref path) => {
write!(f, "Unable to find libstd under RUST_SRC_PATH. N.B. \
RUST_SRC_PATH variable needs to point to the *src* \
directory inside a rust checkout e.g. \
\"/home/foouser/src/rust/src\". \
Current value \"{:?}\"", path)
},
}
}
}
fn check_rust_sysroot() -> Option<path::PathBuf> {
use ::std::process::Command;
let mut cmd = Command::new("rustc");
cmd.arg("--print").arg("sysroot");
if let Ok(output) = cmd.output() {
if let Ok(s) = String::from_utf8(output.stdout) {
let sysroot = path::Path::new(s.trim());
let srcpath = sysroot.join("lib/rustlib/src/rust/src");
if srcpath.exists() {
return Some(srcpath);
}
}
}
None
}
pub fn get_rust_src_path() -> ::std::result::Result<path::PathBuf, RustSrcPathError> {
use std::env;
if let Ok(ref srcpaths) = env::var("RUST_SRC_PATH") {
if !srcpaths.is_empty() {
for path in srcpaths.split(PATH_SEP) {
return validate_rust_src_path(path::PathBuf::from(path));
}
}
};
if let Some(path) = check_rust_sysroot() {
return validate_rust_src_path(path);
};
let default_paths = [
"/usr/local/src/rust/src",
"/usr/src/rust/src",
];
for path in default_paths.iter() {
if let Ok(path) = validate_rust_src_path(path::PathBuf::from(path)) {
return Ok(path);
}
}
return Err(RustSrcPathError::Missing)
}
fn validate_rust_src_path(path: path::PathBuf) -> ::std::result::Result<path::PathBuf, RustSrcPathError> {
if !path.exists() {
Err(RustSrcPathError::DoesNotExist(path.to_path_buf()))
} else if !path.join("libstd").exists() {
Err(RustSrcPathError::NotRustSourceTree(path.join("libstd")))
} else {
Ok(path.to_path_buf())
}
}
#[cfg(test)]
lazy_static! {
static ref TEST_SEMAPHORE: ::std::sync::Mutex<()> = ::std::sync::Mutex::new(());
}
#[test]
fn test_get_rust_src_path_env_ok() {
use std::env;
let _guard = TEST_SEMAPHORE.lock().unwrap();
let original = env::var_os("RUST_SRC_PATH");
if env::var_os("RUST_SRC_PATH").is_none() {
env::set_var("RUST_SRC_PATH", check_rust_sysroot().unwrap());
}
assert!(get_rust_src_path().is_ok());
match original {
Some(path) => env::set_var("RUST_SRC_PATH", path),
None => env::remove_var("RUST_SRC_PATH"),
}
}
#[test]
fn test_get_rust_src_path_does_not_exist() {
use std::env;
let _guard = TEST_SEMAPHORE.lock().unwrap();
let original = env::var_os("RUST_SRC_PATH");
env::set_var("RUST_SRC_PATH", "test_path");
assert_eq!(Err(RustSrcPathError::DoesNotExist(path::PathBuf::from("test_path"))),
get_rust_src_path());
match original {
Some(path) => env::set_var("RUST_SRC_PATH", path),
None => env::remove_var("RUST_SRC_PATH"),
}
}
#[test]
fn test_get_rust_src_path_not_rust_source_tree() {
use std::env;
let _guard = TEST_SEMAPHORE.lock().unwrap();
let original = env::var_os("RUST_SRC_PATH");
env::set_var("RUST_SRC_PATH", "/");
assert_eq!(Err(RustSrcPathError::NotRustSourceTree(path::PathBuf::from("/libstd"))),
get_rust_src_path());
match original {
Some(path) => env::set_var("RUST_SRC_PATH", path),
None => env::remove_var("RUST_SRC_PATH"),
}
}
#[test]
fn test_get_rust_src_path_missing() {
use std::env;
let _guard = TEST_SEMAPHORE.lock().unwrap();
let path = env::var_os("PATH").unwrap();
let original = env::var_os("RUST_SRC_PATH");
env::remove_var("RUST_SRC_PATH");
env::remove_var("PATH");
assert_eq!(Err(RustSrcPathError::Missing),
get_rust_src_path());
env::set_var("PATH", path);
match original {
Some(path) => env::set_var("RUST_SRC_PATH", path),
None => env::remove_var("RUST_SRC_PATH"),
}
}
#[test]
fn test_get_rust_src_path_rustup_ok() {
use std::env;
let _guard = TEST_SEMAPHORE.lock().unwrap();
let original = env::var_os("RUST_SRC_PATH");
env::remove_var("RUST_SRC_PATH");
assert!(get_rust_src_path().is_ok());
match original {
Some(path) => env::set_var("RUST_SRC_PATH", path),
None => env::remove_var("RUST_SRC_PATH"),
}
}
pub struct StackLinkedListNode<'stack, T>(Option<StackLinkedListNodeData<'stack, T>>)
where T: 'stack;
struct StackLinkedListNodeData<'stack, T>
where T: 'stack
{
item: T,
previous: &'stack StackLinkedListNode<'stack, T>,
}
impl<'stack, T> StackLinkedListNode<'stack, T>
where T: 'stack
{
pub fn empty() -> Self {
StackLinkedListNode(None)
}
pub fn push(&'stack self, item: T) -> Self {
StackLinkedListNode(Some(StackLinkedListNodeData {
item: item,
previous: self,
}))
}
}
impl<'stack, T> StackLinkedListNode<'stack, T>
where T: 'stack + PartialEq
{
pub fn contains(&self, item: &T) -> bool {
let mut current = self;
while let &StackLinkedListNode(Some(StackLinkedListNodeData { item: ref current_item, previous })) = current {
if current_item == item {
return true;
}
current = previous;
}
false
}
}
pub fn trim_visibility(blob: &str) -> &str {
if !blob.trim_left().starts_with("pub") {
return blob
}
let mut level = 0;
let mut skip_restricted = 0;
for (i, c) in blob[3..].char_indices() {
match c {
'(' => level += 1,
')' => level -= 1,
_ if level >= 1 => (),
_ if is_ident_char(c) => {
skip_restricted = i + 3;
break;
},
_ => continue,
}
}
&blob[skip_restricted..]
}
#[test]
fn test_trim_visibility() {
assert_eq!(trim_visibility("pub fn"), "fn");
assert_eq!(trim_visibility("pub(crate) struct"), "struct");
assert_eq!(trim_visibility("pub (in super) const fn"), "const fn");
}
pub fn in_fn_name(line_before_point: &str) -> bool {
let has_started_name = !line_before_point.ends_with(|c: char| c.is_whitespace());
let mut words = line_before_point.split_whitespace().rev();
if has_started_name {
if let Some(ident) = words.next() {
if ident.chars().any(|c| !is_ident_char(c)) {
return false;
}
}
}
words
.next()
.map(|word| word == "fn")
.unwrap_or_default()
}
#[test]
fn test_in_fn_name() {
assert!(in_fn_name("fn foo"));
assert!(in_fn_name(" fn foo"));
assert!(in_fn_name("fn "));
assert!(!in_fn_name("fn foo(b"));
assert!(!in_fn_name("fn"));
}