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

use std::str::FromStr;

use serde::{Deserialize, Serialize};

use crate::{
    error::{LinderaError, LinderaErrorKind},
    viterbi::Edge,
};

#[derive(Clone, Debug, Deserialize, Serialize, PartialEq, Eq)]
pub struct Penalty {
    pub kanji_penalty_length_threshold: usize,
    pub kanji_penalty_length_penalty: i32,
    pub other_penalty_length_threshold: usize,
    pub other_penalty_length_penalty: i32,
}

impl Default for Penalty {
    fn default() -> Self {
        Penalty {
            kanji_penalty_length_threshold: 2,
            kanji_penalty_length_penalty: 3000,
            other_penalty_length_threshold: 7,
            other_penalty_length_penalty: 1700,
        }
    }
}

impl Penalty {
    pub fn penalty(&self, edge: &Edge) -> i32 {
        let num_chars = edge.num_chars();
        if num_chars <= self.kanji_penalty_length_threshold {
            return 0;
        }
        if edge.kanji_only {
            ((num_chars - self.kanji_penalty_length_threshold) as i32)
                * self.kanji_penalty_length_penalty
        } else if num_chars > self.other_penalty_length_threshold {
            ((num_chars - self.other_penalty_length_threshold) as i32)
                * self.other_penalty_length_penalty
        } else {
            0
        }
    }
}

#[derive(Debug, Clone, Deserialize, Serialize, PartialEq, Eq)]
pub enum Mode {
    #[serde(rename = "normal")]
    Normal,
    #[serde(rename = "decompose")]
    Decompose(Penalty),
}

impl Mode {
    pub fn is_search(&self) -> bool {
        match self {
            Mode::Normal => false,
            Mode::Decompose(_penalty) => true,
        }
    }
    pub fn penalty_cost(&self, edge: &Edge) -> i32 {
        match self {
            Mode::Normal => 0i32,
            Mode::Decompose(penalty) => penalty.penalty(edge),
        }
    }
}

impl FromStr for Mode {
    type Err = LinderaError;
    fn from_str(mode: &str) -> Result<Mode, Self::Err> {
        match mode {
            "normal" => Ok(Mode::Normal),
            "decompose" => Ok(Mode::Decompose(Penalty::default())),
            _ => {
                Err(LinderaErrorKind::ModeError
                    .with_error(anyhow::anyhow!("Invalid mode: {}", mode)))
            }
        }
    }
}