transbot 0.1.3

A simple translation robot that translates HTMLs/EPUBs based on LLMs.
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140

use anyhow::Error;
use lol_html::{HtmlRewriter, Settings, element, end_tag, text};
use std::cell::RefCell;
use std::collections::HashMap;
use std::rc::Rc;

use crate::*;

#[derive(Default)]
struct ProcessData {
    start_tag_ended: bool,
    depth: u32,
    index: u32,
    elem_buffer: String,
    trans_map: HashMap<u32, String>,
}

fn html_pass2(
    data: Rc<RefCell<ProcessData>>,
    elem_selector: &str,
    orig_html: &[u8],
) -> Result<Vec<u8>, Error> {
    let data1 = data.clone();
    let data2 = data.clone();
    let mut out = Vec::<u8>::new();
    let mut rewriter = HtmlRewriter::new(
        Settings {
            element_content_handlers: vec![element!(elem_selector, move |el| {
                if el.is_self_closing() {
                    return Ok(());
                }
                let data2 = data1.clone();
                {
                    let mut proc_data = data1.borrow_mut();
                    if proc_data.depth > 0 {
                        proc_data.depth += 1;
                    } else {
                        proc_data.depth = 1;
                        proc_data.start_tag_ended = false;
                    }
                }
                el.on_end_tag(end_tag!(move |end| {
                    let mut proc_data = data2.borrow_mut();
                    if proc_data.depth == 1 {
                        proc_data.index += 1;
                        let index = proc_data.index;
                        let mut elem_buffer =
                            proc_data.trans_map.remove(&index).unwrap_or_default();
                        elem_buffer.push_str(&format!("</{}>", end.name()));
                        end.replace(&elem_buffer, lol_html::html_content::ContentType::Html);
                        // Reset state
                        proc_data.depth = 0;
                    } else if proc_data.depth > 1 {
                        proc_data.depth -= 1;
                    }
                    Ok(())
                }))
            })],
            ..Settings::default()
        },
        |c: &[u8]| {
            let mut proc_data = data2.borrow_mut();
            if proc_data.depth == 0 || !proc_data.start_tag_ended {
                out.extend_from_slice(c);
                proc_data.start_tag_ended = true;
            }
        },
    );
    rewriter.write(orig_html)?;
    rewriter.end()?;
    Ok(out)
}

pub fn translate_html(
    llm_interactor: &LlmConnector,
    elem_selector: &str,
    orig_html: &[u8],
) -> Result<Vec<u8>, Error> {
    let data = Rc::new(RefCell::new(ProcessData::default()));
    let data1 = data.clone();
    let data2 = data.clone();
    let settings = Settings {
        element_content_handlers: vec![
            element!(elem_selector, move |el| {
                if el.is_self_closing() {
                    return Ok(());
                }
                let data2 = data1.clone();
                {
                    let mut proc_data = data1.borrow_mut();
                    if proc_data.depth > 0 {
                        proc_data.depth += 1;
                    } else {
                        proc_data.depth = 1;
                        proc_data.elem_buffer.clear();
                    }
                }
                el.on_end_tag(end_tag!(move |_end| {
                    let mut proc_data = data2.borrow_mut();
                    if proc_data.depth == 1 {
                        proc_data.index += 1;
                        let index = proc_data.index;
                        let mut elem_buffer = String::new();
                        std::mem::swap(&mut elem_buffer, &mut proc_data.elem_buffer);
                        proc_data.trans_map.insert(index, elem_buffer);
                        // Reset state
                        proc_data.depth = 0;
                    } else if proc_data.depth > 1 {
                        proc_data.depth -= 1;
                    }
                    Ok(())
                }))
            }),
            text!("*", move |text_chunk| {
                let mut proc_data = data2.borrow_mut();
                if proc_data.depth > 0 {
                    proc_data.elem_buffer.push_str(text_chunk.as_str());
                }
                Ok(())
            }),
        ],
        ..Settings::default()
    };

    let mut rewriter = HtmlRewriter::new(settings, |_c: &[u8]| {});
    rewriter.write(orig_html)?;

    {
        let data3 = data.clone();
        let mut proc_data = data3.borrow_mut();
        for index in 1..=proc_data.index {
            let text = proc_data.trans_map.get(&index).unwrap();
            let translated = llm_interactor.interact(text)?;
            proc_data.trans_map.insert(index, translated);
        }
        proc_data.index = 0;
    }

    html_pass2(data, elem_selector, orig_html)
}