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
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168

//! Dictionary for tokenization.
pub(crate) mod builder;
pub(crate) mod character;
pub(crate) mod connector;
pub(crate) mod lexicon;
pub(crate) mod mapper;
pub(crate) mod unknown;
pub(crate) mod word_idx;

use std::io::{Read, Write};

use bincode::{Decode, Encode};

use crate::common;
use crate::dictionary::character::CharProperty;
use crate::dictionary::connector::Connector;
use crate::dictionary::lexicon::Lexicon;
use crate::dictionary::mapper::ConnIdMapper;
use crate::dictionary::unknown::UnkHandler;
use crate::dictionary::word_idx::WordIdx;
use crate::errors::Result;

pub(crate) use crate::dictionary::lexicon::WordParam;

/// Type of a lexicon that contains the word.
#[derive(Clone, Copy, Eq, PartialEq, Debug, Decode, Encode)]
#[repr(u8)]
pub enum LexType {
    /// System lexicon.
    System,
    /// User lexicon.
    User,
    /// Unknown words.
    Unknown,
}

impl Default for LexType {
    fn default() -> Self {
        Self::System
    }
}

/// Inner data of [`Dictionary`].
#[derive(Decode, Encode)]
pub(crate) struct DictionaryInner {
    system_lexicon: Lexicon,
    user_lexicon: Option<Lexicon>,
    connector: Connector,
    mapper: Option<ConnIdMapper>,
    char_prop: CharProperty,
    unk_handler: UnkHandler,
}

/// Dictionary for tokenization.
pub struct Dictionary {
    pub(crate) data: DictionaryInner,
    pub(crate) need_check: bool,
}

impl Dictionary {
    /// Gets the reference to the system lexicon.
    #[inline(always)]
    pub(crate) const fn system_lexicon(&self) -> &Lexicon {
        &self.data.system_lexicon
    }

    /// Gets the reference to the user lexicon.
    #[inline(always)]
    pub(crate) const fn user_lexicon(&self) -> Option<&Lexicon> {
        self.data.user_lexicon.as_ref()
    }

    /// Gets the reference to the connection matrix.
    #[inline(always)]
    pub(crate) const fn connector(&self) -> &Connector {
        &self.data.connector
    }

    /// Gets the reference to the mapper for connection ids.
    #[allow(dead_code)]
    #[inline(always)]
    pub(crate) const fn mapper(&self) -> Option<&ConnIdMapper> {
        self.data.mapper.as_ref()
    }

    /// Gets the reference to the character property.
    #[inline(always)]
    pub(crate) const fn char_prop(&self) -> &CharProperty {
        &self.data.char_prop
    }

    /// Gets the reference to the handler of unknown words.
    #[inline(always)]
    pub(crate) const fn unk_handler(&self) -> &UnkHandler {
        &self.data.unk_handler
    }

    /// Gets the word parameter.
    #[inline(always)]
    pub(crate) fn word_param(&self, word_idx: WordIdx) -> WordParam {
        match word_idx.lex_type {
            LexType::System => self.system_lexicon().word_param(word_idx),
            LexType::User => self.user_lexicon().unwrap().word_param(word_idx),
            LexType::Unknown => self.unk_handler().word_param(word_idx),
        }
    }

    /// Gets the reference to the feature string.
    #[inline(always)]
    pub(crate) fn word_feature(&self, word_idx: WordIdx) -> &str {
        match word_idx.lex_type {
            LexType::System => self.system_lexicon().word_feature(word_idx),
            LexType::User => self.user_lexicon().unwrap().word_feature(word_idx),
            LexType::Unknown => self.unk_handler().word_feature(word_idx),
        }
    }

    /// Exports the dictionary data.
    ///
    /// # Errors
    ///
    /// When bincode generates an error, it will be returned as is.
    pub fn write<W>(&self, mut wtr: W) -> Result<usize>
    where
        W: Write,
    {
        let num_bytes =
            bincode::encode_into_std_write(&self.data, &mut wtr, common::bincode_config())?;
        Ok(num_bytes)
    }

    /// Creates a dictionary from a reader.
    ///
    /// # Errors
    ///
    /// When bincode generates an error, it will be returned as is.
    pub fn read<R>(mut rdr: R) -> Result<Self>
    where
        R: Read,
    {
        let data = bincode::decode_from_std_read(&mut rdr, common::bincode_config())?;
        Ok(Self {
            data,
            need_check: true,
        })
    }

    /// Creates a dictionary from a reader.
    ///
    /// # Safety
    ///
    /// The given reader must be a correct file exported by
    /// [`Dictionary::write()`].
    ///
    /// # Errors
    ///
    /// When bincode generates an error, it will be returned as is.
    pub unsafe fn read_unchecked<R>(mut rdr: R) -> Result<Self>
    where
        R: Read,
    {
        let data = bincode::decode_from_std_read(&mut rdr, common::bincode_config())?;
        Ok(Self {
            data,
            need_check: false,
        })
    }
}