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extern crate proc_macro;
use proc_macro::TokenStream;
use serde_json::Value;
fn split_to_vec(input: &str) -> Vec<&str> {
let mut start = 0;
let mut cnt = 0;
let mut ret = vec![];
for (idx, c) in input.chars().enumerate() {
match c {
'[' => {
if cnt == 0 {
start = idx;
}
cnt += 1;
}
']' => {
cnt -= 1;
if cnt == 0 {
ret.push(&input[start..=idx]);
start = idx + 1;
}
}
_ => (),
}
}
ret
}
fn turn_to_legal_name(name: &str) -> String {
let mut ret = String::new();
let mut skiped_first = false;
for c in name.chars() {
if c.is_ascii_uppercase() && skiped_first {
ret.push('_');
ret.push(c.to_ascii_lowercase());
} else {
ret.push(c);
}
if c == ',' {
skiped_first = true;
}
}
ret
}
trait ToArgs {
fn to_args(&self) -> String;
}
impl ToArgs for Value {
fn to_args(&self) -> String {
let array = self.as_array().unwrap();
if array.is_empty() {
"".to_owned()
} else {
array
.iter()
.map(|value| {
if value.is_string() {
format!("{}.to_owned()", value)
} else {
value.to_string()
}
})
.collect::<Vec<_>>()
.join(", ")
}
}
}
fn json_to_code(input: TokenStream) -> String {
let input = input.to_string();
let v = split_to_vec(&input);
let (funcs, args, rets) = (v[0], v[1], v[2]);
let funcs = serde_json::from_str::<Value>(&turn_to_legal_name(funcs)).unwrap();
let args = serde_json::from_str::<Value>(&args.replace("- ", "-")).unwrap();
let rets = serde_json::from_str::<Value>(&rets.replace("- ", "-")).unwrap();
let mut code = String::new();
code.push_str(&format!(
"let mut obj = {}::new({});\n",
funcs[0].as_str().unwrap(),
args[0].to_args(),
));
for i in 1..funcs.as_array().unwrap().len() {
let mut stmt = format!("obj.{}({})", funcs[i].as_str().unwrap(), args[i].to_args());
if !rets[i].is_null() {
stmt = format!(
r##"assert_eq!({}, {}, r#"{}"#)"##,
stmt,
rets[i].to_string(),
stmt
);
}
stmt.push_str(";\n");
code.push_str(&stmt);
}
code
}
#[proc_macro]
pub fn leetcode_test(input: TokenStream) -> TokenStream {
json_to_code(input).parse().unwrap()
}
#[proc_macro]
pub fn leetcode_test_debug(input: TokenStream) -> TokenStream {
format!(r###"r##"{}"##"###, json_to_code(input))
.parse()
.unwrap()
}