I'm new to Rust, so I don't know how to fix the error. I understood that the libraries were not imported, but in the file cargo.toml all the libraries are imported. sus_fns.rs:
use std::fs;
use rand::Rng;
use regex::Regex;
pub fn generate_memes_text(chat_id: &str) -> String {
let filename = format!("../all_databases/stytsko_folder_id_{}_v/stytsko_db_mod=one-line_id_{}_v.txt", chat_id, chat_id);
let _contents = fs::read_to_string(&filename).expect("Unable to read file");
fn extract_words_from_buffer(buffer: &str) -> Vec<&str> {
let re = Regex::new(r"[\s\n]+").unwrap();
re.split(buffer.trim()).collect()
}
fn build_markov_chain<'a>(words: &'a [&'a str]) -> std::collections::HashMap<&'a str, Vec<&'a str>> {
let mut markov_chain = std::collections::HashMap::new();
for i in 0..words.len()-1 {
let current_word = words[i];
let next_word = words[i+1];
markov_chain.entry(current_word).or_insert(Vec::new()).push(next_word);
}
markov_chain
}
fn generate_markov_expression(markov_chain: &std::collections::HashMap<&str, Vec<&str>>, num_words: usize) -> String {
let mut expression = String::new();
let mut current_word = get_random_word(markov_chain.keys().cloned().collect());
let mut num_words_remaining = num_words;
while num_words_remaining > 0 {
expression.push_str(current_word);
expression.push(' ');
let empty_vec = Vec::new();
let next_words = markov_chain.get(current_word).unwrap_or(&empty_vec).to_vec();
if next_words.is_empty() {
break;
}
current_word = get_random_word(next_words.iter().cloned().collect());
num_words_remaining -= 1;
}
expression.trim().to_string()
}
fn get_random_word(words: Vec<&str>) -> &str {
let mut rng = rand::thread_rng();
let random_index = rng.gen_range(0..words.len());
words[random_index]
}
fn generate_message_from_file(filename: &str, num_words: usize) -> String {
let contents = fs::read_to_string(filename).expect("Unable to read file");
let words = extract_words_from_buffer(&contents);
let expression = if words.len() > num_words {
let markov_chain = build_markov_chain(&words);
generate_markov_expression(&markov_chain, num_words)
} else if words.len() == num_words {
words.join(" ")
} else {
words[..words.len()-1].join(" ")
};
expression
}
let num_words = rand::thread_rng().gen_range(1..=5);
let selected_words = generate_message_from_file(&filename.clone(), num_words);
selected_words
}
lib.rs:
mod sys_fns;
#[no_mangle]
pub extern "C" fn generate_memes_text(chat_id: *const i8) -> *mut i8 {
use std::ffi::CString;
use std::ffi::CStr;
use std::str;
let chat_id_str = unsafe { CStr::from_ptr(chat_id).to_bytes() };
let chat_id_string = str::from_utf8(chat_id_str).unwrap();
let selected_words = sys_fns::generate_memes_text(chat_id_string);
let result = CString::new(selected_words).unwrap().into_raw();
result
}
cargo.toml:
[package]
name = "myproject"
version = "0.1.0"
edition = "2021"
[dependencies]
rand = "0.8"
regex = "1.4"
error:
C:\MeFolder\testing python with rust>rustc --crate-type cdylib myproject/src/lib.rs
error[E0432]: unresolved import `rand`
--> myproject/src\sys_fns.rs:2:5
|
2 | use rand::Rng;
| ^^^^ maybe a missing crate `rand`?
|
= help: consider adding `extern crate rand` to use the `rand` crate
error[E0432]: unresolved import `regex`
--> myproject/src\sys_fns.rs:3:5
|
3 | use regex::Regex;
| ^^^^^ maybe a missing crate `regex`?
|
= help: consider adding `extern crate regex` to use the `regex` crate
error[E0433]: failed to resolve: use of undeclared crate or module `rand`
--> myproject/src\sys_fns.rs:71:21
|
71 | let num_words = rand::thread_rng().gen_range(1..=5);
| ^^^^ use of undeclared crate or module `rand`
error[E0433]: failed to resolve: use of undeclared crate or module `rand`
--> myproject/src\sys_fns.rs:50:23
|
50 | let mut rng = rand::thread_rng();
| ^^^^ use of undeclared crate or module `rand`
error: aborting due to 4 previous errors
Some errors have detailed explanations: E0432, E0433.
For more information about an error, try `rustc --explain E0432`.
the code from sys_fns.rs was not written by me. It was translated from Python to Rust by perplexity.ai
I tried to update cargo, wrote commands cargo update, cargo build (after writing all libraries in cargo.toml), but the error is still the same. also I tried to do it through cargo build --release --lib but then the dll file did not appear.
You should never invoke rustc directly, unless you really know what you're doing. Always use cargo.
If you want a cdylib, say that in Cargo.toml:
[package]
name = "myproject"
version = "0.1.0"
edition = "2021"
[lib]
crate-type = ["cdylib"]
[dependencies]
rand = "0.8"
regex = "1.4"
Then build the package using cargo build, and check the target/debug folder (or target/release for cargo build --release) for the output file (.dll or .so or .dylib).