rustling 0.8.0

A blazingly fast library for computational linguistics
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

//! Convert SRT data to CHAT format.

use super::reader::SrtFile;

/// Convert a single [`SrtFile`] to a CHAT format string.
///
/// Uses a default participant code `"SPK"` since SRT has no participant info.
pub(crate) fn srt_file_to_chat_str(file: &SrtFile) -> String {
    let mut output = String::with_capacity(4096);
    output.push_str("@UTF8\n");
    output.push_str("@Begin\n");
    output.push_str("@Participants:\tSPK Speaker\n");

    for block in &file.blocks {
        // Join multiline subtitle text with space for CHAT (single-line utterances).
        let text = block.text.replace('\n', " ");
        output.push_str(&format!(
            "*SPK:\t{text} \x15{start}_{end}\x15\n",
            start = block.start_ms,
            end = block.end_ms,
        ));
    }

    output.push_str("@End\n");
    output
}

// ---------------------------------------------------------------------------
// Tests
// ---------------------------------------------------------------------------

#[cfg(test)]
mod tests {
    use super::*;
    use crate::chat::BaseChat;
    use crate::srt::reader::{SrtBlock, SrtFile};

    fn make_srt_file(blocks: Vec<SrtBlock>) -> SrtFile {
        SrtFile {
            file_path: "test.srt".to_string(),
            blocks,
        }
    }

    #[test]
    fn test_basic_conversion() {
        let file = make_srt_file(vec![SrtBlock {
            index: 1,
            text: "Hello world.".to_string(),
            start_ms: 0,
            end_ms: 1500,
        }]);
        let chat = srt_file_to_chat_str(&file);

        assert!(chat.contains("@UTF8"));
        assert!(chat.contains("@Begin"));
        assert!(chat.contains("@Participants:\tSPK Speaker"));
        assert!(chat.contains("*SPK:\tHello world. \x150_1500\x15"));
        assert!(chat.contains("@End"));
    }

    #[test]
    fn test_multiline_text_joined() {
        let file = make_srt_file(vec![SrtBlock {
            index: 1,
            text: "Senator, we're making\nour final approach.".to_string(),
            start_ms: 136612,
            end_ms: 139376,
        }]);
        let chat = srt_file_to_chat_str(&file);

        // Multiline text should be joined with space.
        assert!(
            chat.contains("*SPK:\tSenator, we're making our final approach. \x15136612_139376\x15")
        );
    }

    #[test]
    fn test_multiple_blocks() {
        let file = make_srt_file(vec![
            SrtBlock {
                index: 1,
                text: "First line.".to_string(),
                start_ms: 0,
                end_ms: 1000,
            },
            SrtBlock {
                index: 2,
                text: "Second line.".to_string(),
                start_ms: 1500,
                end_ms: 3000,
            },
        ]);
        let chat = srt_file_to_chat_str(&file);

        assert!(chat.contains("*SPK:\tFirst line. \x150_1000\x15"));
        assert!(chat.contains("*SPK:\tSecond line. \x151500_3000\x15"));
    }

    #[test]
    fn test_empty_file() {
        let file = make_srt_file(vec![]);
        let chat = srt_file_to_chat_str(&file);

        assert!(chat.contains("@Begin"));
        assert!(chat.contains("@End"));
        assert!(chat.contains("@Participants:\tSPK Speaker"));
    }

    #[test]
    fn test_round_trip_via_chat_parser() {
        let file = make_srt_file(vec![
            SrtBlock {
                index: 1,
                text: "Hello world.".to_string(),
                start_ms: 0,
                end_ms: 1500,
            },
            SrtBlock {
                index: 2,
                text: "Goodbye.".to_string(),
                start_ms: 2000,
                end_ms: 3500,
            },
        ]);
        let chat_str = srt_file_to_chat_str(&file);

        // Parse the generated CHAT string.
        let (chat, _) = crate::chat::Chat::from_strs(vec![chat_str], None, false, None, None);
        let files = chat.files();
        assert_eq!(files.len(), 1);

        let utts: Vec<_> = files[0].real_utterances().collect();
        assert_eq!(utts.len(), 2);
        assert_eq!(utts[0].participant.as_deref(), Some("SPK"));
        assert_eq!(utts[0].time_marks, Some((0, 1500)));
        assert_eq!(utts[1].participant.as_deref(), Some("SPK"));
        assert_eq!(utts[1].time_marks, Some((2000, 3500)));
    }
}