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// Copyright 2019 TiKV Project Authors. Licensed under Apache-2.0.
use std::fmt;
use std::str;
// A struct that divide a name into serveral parts that meets rust's guidelines.
struct NameSpliter<'a> {
name: &'a [u8],
pos: usize,
}
impl<'a> NameSpliter<'a> {
fn new(s: &str) -> NameSpliter {
NameSpliter {
name: s.as_bytes(),
pos: 0,
}
}
}
impl<'a> Iterator for NameSpliter<'a> {
type Item = &'a str;
fn next(&mut self) -> Option<&'a str> {
if self.pos == self.name.len() {
return None;
}
// skip all prefix '_'
while self.pos < self.name.len() && self.name[self.pos] == b'_' {
self.pos += 1;
}
let mut pos = self.name.len();
let mut upper_len = 0;
let mut meet_lower = false;
for i in self.pos..self.name.len() {
let c = self.name[i];
if (b'A'..=b'Z').contains(&c) {
if meet_lower {
// So it should be AaA or aaA
pos = i;
break;
}
upper_len += 1;
} else if c == b'_' {
pos = i;
break;
} else {
meet_lower = true;
if upper_len > 1 {
// So it should be AAa
pos = i - 1;
break;
}
}
}
let s = str::from_utf8(&self.name[self.pos..pos]).unwrap();
self.pos = pos;
Some(s)
}
}
/// Adjust method name to follow rust-guidelines.
pub fn to_snake_case(name: &str) -> String {
let mut snake_method_name = String::with_capacity(name.len());
for s in NameSpliter::new(name) {
snake_method_name.push_str(&s.to_lowercase());
snake_method_name.push('_');
}
snake_method_name.pop();
snake_method_name
}
#[cfg(feature = "protobuf-codec")]
pub fn to_camel_case(name: &str) -> String {
let mut camel_case_name = String::with_capacity(name.len());
for s in NameSpliter::new(name) {
let mut chs = s.chars();
camel_case_name.extend(chs.next().unwrap().to_uppercase());
camel_case_name.push_str(&s[1..].to_lowercase());
}
camel_case_name
}
pub fn fq_grpc(item: &str) -> String {
format!("::grpcio::{}", item)
}
pub enum MethodType {
Unary,
ClientStreaming,
ServerStreaming,
Duplex,
}
impl fmt::Display for MethodType {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(
f,
"{}",
match self {
MethodType::Unary => "MethodType::Unary",
MethodType::ClientStreaming => "MethodType::ClientStreaming",
MethodType::ServerStreaming => "MethodType::ServerStreaming",
MethodType::Duplex => "MethodType::Duplex",
}
)
}
}
#[cfg(test)]
mod test {
#[test]
fn test_snake_name() {
let cases = vec![
("AsyncRequest", "async_request"),
("asyncRequest", "async_request"),
("async_request", "async_request"),
("createID", "create_id"),
("AsyncRClient", "async_r_client"),
("CreateIDForReq", "create_id_for_req"),
("Create_ID_For_Req", "create_id_for_req"),
("Create_ID_For__Req", "create_id_for_req"),
("ID", "id"),
("id", "id"),
];
for (origin, exp) in cases {
let res = super::to_snake_case(&origin);
assert_eq!(res, exp);
}
}
#[test]
#[cfg(feature = "protobuf-codec")]
fn test_camel_name() {
let cases = vec![
("AsyncRequest", "AsyncRequest"),
("asyncRequest", "AsyncRequest"),
("async_request", "AsyncRequest"),
("createID", "CreateId"),
("AsyncRClient", "AsyncRClient"),
("async_r_client", "AsyncRClient"),
("CreateIDForReq", "CreateIdForReq"),
("Create_ID_For_Req", "CreateIdForReq"),
("Create_ID_For__Req", "CreateIdForReq"),
("ID", "Id"),
("id", "Id"),
];
for (origin, exp) in cases {
let res = super::to_camel_case(&origin);
assert_eq!(res, exp);
}
}
}
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