From a71087840ed2dc77b88c2e340fcf0629c05caf6c Mon Sep 17 00:00:00 2001
From: hr567 <hr567@hr567.me>
Date: Wed, 6 Mar 2024 01:26:15 +0800
Subject: [PATCH] Initial commit

Signed-off-by: hr567 <hr567@hr567.me>
---
 .gitignore  |    1 +
 Cargo.lock  | 1052 +++++++++++++++++++++++++++++++++++++++++++++++++++
 Cargo.toml  |   29 ++
 src/main.rs |  236 ++++++++++++
 4 files changed, 1318 insertions(+)
 create mode 100644 .gitignore
 create mode 100644 Cargo.lock
 create mode 100644 Cargo.toml
 create mode 100644 src/main.rs

diff --git a/.gitignore b/.gitignore
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index 0000000..ea8c4bf
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diff --git a/Cargo.lock b/Cargo.lock
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..7f2a757
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,29 @@
+[package]
+name = "default"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+clap = { version = "4.5.1", features = ["env", "derive"] }
+futures = "0.3.30"
+indicatif = "0.17.8"
+once_cell = "1.19.0"
+rand = "0.8.5"
+rand_distr = "0.4.3"
+serde = { version = "1.0.197", features = ["derive"] }
+serde_json = "1.0.114"
+tokio = { version = "1.36.0", features = ["full"] }
+tokio-stream = { version = "0.1.14", features = ["full"] }
+tracing = "0.1.40"
+tracing-subscriber = { version = "0.3.18", features = ["env-filter"] }
+
+[profile.release]
+lto = true
+panic = "abort"
+codegen-units = 1
+debug = true
+split-debuginfo = "packed"
+
+[build-dependencies]
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..d476ff3
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,236 @@
+use std::cell::RefCell;
+use std::collections::{BTreeMap, HashMap, VecDeque};
+use std::fmt::Write;
+use std::io;
+use std::os::unix::prelude::*;
+use std::path::PathBuf;
+use std::rc::{Rc, Weak};
+use std::sync::{
+    atomic::{AtomicUsize, Ordering},
+    Arc,
+};
+use std::time::Duration;
+
+use clap::Parser;
+use indicatif::{ProgressBar, ProgressState, ProgressStyle};
+use tokio::{fs, io::AsyncReadExt, sync::Semaphore, time::sleep};
+
+static KEYWORDS: &[&str] = &[
+    "数字经济",
+    "数字媒体",
+    "数字化",
+    "数字资产",
+    "数字化转型",
+    "数据管理",
+    "数据挖掘",
+    "数据网络",
+    "数据平台",
+    "数据中心",
+    "数据科学",
+    "数字控制",
+    "数字技术",
+    "数字通信",
+    "数字网络",
+    "数字智能",
+    "数字终端",
+    "数字营销",
+    "大数据",
+    "云计算",
+    "云IT",
+    "云生态",
+    "云服务",
+    "云平台",
+    "区块链",
+    "物联网",
+    "机器学习",
+];
+thread_local! {
+    static ANALYZER: AhoCorasick = AhoCorasick::new(KEYWORDS);
+}
+
+#[derive(Parser, Debug)]
+#[command(version, about, long_about = None)]
+struct Args {
+    #[arg(short, long)]
+    directory: PathBuf,
+    #[arg(short, long, default_value = "16")]
+    jobs: usize,
+}
+
+#[tokio::main]
+async fn main() -> io::Result<()> {
+    tracing_subscriber::fmt::init();
+
+    let args = Args::parse();
+    println!("{}", args.directory.display());
+
+    let all_tasks = {
+        let mut res = Vec::new();
+        let mut files = fs::read_dir(&args.directory).await?;
+        while let Some(entry) = files.next_entry().await? {
+            if entry.path().extension().map_or(false, |ext| ext == "txt") {
+                tracing::debug!(
+                    "Text file {} has been added to task list",
+                    entry.path().display()
+                );
+                let metadata = entry.metadata().await?;
+                let task = Task {
+                    file: entry.path(),
+                    size: metadata.size() as usize,
+                };
+                res.push(task);
+            }
+        }
+        res
+    };
+
+    let permits = Arc::new(Semaphore::new(args.jobs));
+    let total_size: usize = all_tasks.iter().map(|t| t.size).sum();
+    let analyzed_size = Arc::new(AtomicUsize::new(0));
+    tracing::info!("A total of {} bytes of text to analyze", total_size);
+    let mut tasks = Vec::new();
+    for task in all_tasks.into_iter() {
+        let analyzed_size = analyzed_size.clone();
+        let permits = permits.clone();
+        let task = tokio::spawn(async move {
+            let _ = permits.acquire().await.unwrap();
+            let mut buf = String::new();
+            let len = fs::File::open(&task.file)
+                .await?
+                .read_to_string(&mut buf)
+                .await?;
+            let result = ANALYZER.with(|analyzer| analyzer.analyze(&buf));
+            tracing::debug_span!("after analyzing").in_scope(|| {
+                tracing::debug!("Analysis of file {}", &task.file.display());
+                for (word, count) in result.iter() {
+                    tracing::debug!("{}: {}", word, count);
+                }
+            });
+            let mut target_file = task.file;
+            target_file.set_extension("json");
+            let json_result = serde_json::to_vec(&result).unwrap();
+            fs::write(target_file, json_result).await?;
+            analyzed_size.fetch_add(len, Ordering::Release);
+            io::Result::Ok(())
+        });
+        tasks.push(task);
+    }
+
+    let progress = tokio::spawn(async move {
+        let process = ProgressBar::new(total_size as u64);
+        const TEMPLATE : &str = "{spinner:.green} [{elapsed_precise}] [{wide_bar:.cyan/blue}] {bytes}/{total_bytes} ({eta})";
+        let style = ProgressStyle::with_template(TEMPLATE)
+            .unwrap()
+            .with_key("eta", |state: &ProgressState, w: &mut dyn Write| {
+                write!(w, "{:.1}s", state.eta().as_secs_f64()).unwrap()
+            })
+            .progress_chars("#>-");
+        process.set_style(style);
+        while analyzed_size.load(Ordering::Acquire) < total_size {
+            process.set_position(analyzed_size.load(Ordering::Acquire) as u64);
+            sleep(Duration::from_millis(100)).await;
+        }
+        process.finish_with_message("All files have been processed");
+    });
+    let results = futures::future::join_all(tasks).await;
+    if let Err(e) = progress.await {
+        tracing::error!("failed to process all tasks: {}", e);
+    }
+    for res in results.into_iter().map(|r| r.unwrap()) {
+        if let Err(e) = res {
+            tracing::error!("failed to process a task: {}", e);
+        }
+    }
+
+    Ok(())
+}
+
+struct Task {
+    file: PathBuf,
+    size: usize,
+}
+
+#[derive(Default)]
+pub struct AhoCorasick {
+    root: Rc<RefCell<ACNode>>,
+}
+
+impl AhoCorasick {
+    pub fn new(words: &[&str]) -> Self {
+        let root = Rc::new(RefCell::new(ACNode::default()));
+        for word in words {
+            let mut cur = Rc::clone(&root);
+            for c in word.chars() {
+                cur = Rc::clone(Rc::clone(&cur).borrow_mut().trans.entry(c).or_default());
+            }
+            cur.borrow_mut().lengths.push(word.len());
+        }
+        Self::build_suffix(Rc::clone(&root));
+        Self { root }
+    }
+
+    fn build_suffix(root: Rc<RefCell<ACNode>>) {
+        let mut q = VecDeque::new();
+        q.push_back(Rc::clone(&root));
+        while let Some(parent) = q.pop_front() {
+            let parent = parent.borrow();
+            for (c, child) in &parent.trans {
+                q.push_back(Rc::clone(child));
+                let mut child = child.borrow_mut();
+                let mut suffix = parent.suffix.upgrade();
+                loop {
+                    match &suffix {
+                        None => {
+                            child.lengths.extend(root.borrow().lengths.clone());
+                            child.suffix = Rc::downgrade(&root);
+                            break;
+                        }
+                        Some(node) => {
+                            if node.borrow().trans.contains_key(c) {
+                                let node = &node.borrow().trans[c];
+                                child.lengths.extend(node.borrow().lengths.clone());
+                                child.suffix = Rc::downgrade(node);
+                                break;
+                            } else {
+                                suffix = suffix.unwrap().borrow().suffix.upgrade();
+                            }
+                        }
+                    }
+                }
+            }
+        }
+    }
+
+    pub fn analyze<'a>(&self, s: &'a str) -> HashMap<&'a str, usize> {
+        let mut ans = HashMap::new();
+        let mut cur = Rc::clone(&self.root);
+        let mut position: usize = 0;
+        for c in s.chars() {
+            loop {
+                if let Some(child) = Rc::clone(&cur).borrow().trans.get(&c) {
+                    cur = Rc::clone(child);
+                    break;
+                }
+                let suffix = cur.borrow().suffix.clone();
+                match suffix.upgrade() {
+                    Some(node) => cur = node,
+                    None => break,
+                }
+            }
+            position += c.len_utf8();
+            for &len in &cur.borrow().lengths {
+                ans.entry(&s[position - len..position])
+                    .and_modify(|e| *e += 1)
+                    .or_insert(1);
+            }
+        }
+        ans
+    }
+}
+
+#[derive(Default)]
+struct ACNode {
+    trans: BTreeMap<char, Rc<RefCell<ACNode>>>,
+    suffix: Weak<RefCell<ACNode>>,
+    lengths: Vec<usize>,
+}