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
169
170
171
172
173
174
175
176
177
178
179

//! Intended to be compatible with <https://github.com/MihaiValentin/lunr-languages>. Each supported 
//! language has a trimmer, a stop word filter, and a stemmer. Most users will not need to use 
//! these modules directly.

#[allow(unused_macros)]
macro_rules! make_trimmer {
    ($reg:expr) => {
        pub fn trimmer(token: String) -> Option<String> {
            use ::regex::Regex;
            lazy_static! {
                static ref START: Regex = Regex::new(concat!("^[^", $reg, "]+")).unwrap();
                static ref END: Regex = Regex::new(concat!("[^", $reg, "]+$")).unwrap();
            }
            let token = START.replace(&token, "");
            Some(END.replace(&token, "").into())
        }
    };
}

macro_rules! make_stop_word_filter {
    ($words:expr) => {
        pub fn stop_word_filter(token: String) -> Option<String> {
            use ::std::collections::HashSet;
            lazy_static! {
                static ref WORDS: HashSet<&'static str> = {
                    let words = $words;
                    let mut set = HashSet::with_capacity(words.len());
                    for word in words.iter() {
                        set.insert(*word);
                    }
                    set
                };
            }
            if WORDS.contains(token.as_str()) {
                None
            } else {
                Some(token)
            }
        }
    };
}

#[cfg(feature = "rust-stemmers")]
macro_rules! make_stemmer {
    ($lang:expr) => {
        pub fn stemmer(token: String) -> Option<String> {
            use rust_stemmers::{Algorithm, Stemmer};
            lazy_static! {
                static ref STEMMER: Stemmer = Stemmer::create($lang);
            }
            Some(STEMMER.stem(&token).into())
        }
    };
}

/// Used to configure the `Index` for a specific lanugage.
#[derive(Copy, Clone, Eq, PartialEq, Debug, EnumString, ToString, EnumIter)]
pub enum Language {
    English,
    #[cfg(feature = "da")] Danish,
    #[cfg(feature = "du")] Dutch,
    #[cfg(feature = "fi")] Finnish,
    #[cfg(feature = "fr")] French,
    #[cfg(feature = "de")] German,
    #[cfg(feature = "it")] Italian,
    #[cfg(feature = "pt")] Portuguese,
    #[cfg(feature = "ro")] Romanian,
    #[cfg(feature = "ru")] Russian,
    #[cfg(feature = "es")] Spanish,
    #[cfg(feature = "sv")] Swedish,
    #[cfg(feature = "tr")] Turkish,
    #[doc(hidden)]
    #[strum(disabled = "true")]
    __NonExhaustive,
}

impl Language {
    /// Returns the `Language` for the given two-character [ISO 639-1][iso] language code if the 
    /// language is supported. Returns `None` if not supported.
    /// 
    /// *Note:*
    /// 
    /// The ISO 639-1 code for Dutch is "nl". However "du" is used for the module name
    /// and pipeline suffix in order to match lunr-languages.
    /// 
    /// [iso]: https://en.wikipedia.org/wiki/ISO_639-1
    pub fn from_code(code: &str) -> Option<Language> {
        match code.to_ascii_lowercase().as_str() {
            "en" => Some(Language::English),
            #[cfg(feature = "da")] "da" => Some(Language::Danish),
            #[cfg(feature = "du")] "nl" => Some(Language::Dutch),
            #[cfg(feature = "fi")] "fi" => Some(Language::Finnish),
            #[cfg(feature = "fr")] "fr" => Some(Language::French),
            #[cfg(feature = "de")] "de" => Some(Language::German),
            #[cfg(feature = "it")] "it" => Some(Language::Italian),
            #[cfg(feature = "pt")] "pt" => Some(Language::Portuguese),
            #[cfg(feature = "ro")] "ro" => Some(Language::Romanian),
            #[cfg(feature = "ru")] "ru" => Some(Language::Russian),
            #[cfg(feature = "es")] "es" => Some(Language::Spanish),
            #[cfg(feature = "sv")] "sv" => Some(Language::Swedish),
            #[cfg(feature = "tr")] "tr" => Some(Language::Turkish),
            _ => None,
        }
    }

    /// Returns the two-character [ISO 639-1][iso] language code for the `Language`.
    /// 
    /// *Note:*
    /// 
    /// The ISO 639-1 code for Dutch is "nl". However "du" is used for the module name
    /// and pipeline suffix in order to match lunr-languages.
    /// 
    /// [iso]: https://en.wikipedia.org/wiki/ISO_639-1
    pub fn to_code(&self) -> &'static str {
        match *self {
            Language::English => "en",
            #[cfg(feature = "da")] Language::Danish => "da",
            #[cfg(feature = "du")] Language::Dutch => "nl",
            #[cfg(feature = "fi")] Language::Finnish => "fi",
            #[cfg(feature = "fr")] Language::French => "fr",
            #[cfg(feature = "de")] Language::German => "de",
            #[cfg(feature = "it")] Language::Italian => "it",
            #[cfg(feature = "pt")] Language::Portuguese => "pt",
            #[cfg(feature = "ro")] Language::Romanian => "ro",
            #[cfg(feature = "ru")] Language::Russian => "ru",
            #[cfg(feature = "es")] Language::Spanish => "es",
            #[cfg(feature = "sv")] Language::Swedish => "sv",
            #[cfg(feature = "tr")] Language::Turkish => "tr",
            _ => panic!("Don't use the __NonExhaustive variant!"),
        }
    }

    /// Creates a pipeline for the [`Language`](../lang/enum.Language.html).
    pub fn make_pipeline(&self) -> ::pipeline::Pipeline {
        match *self {
            Language::English => ::lang::en::make_pipeline(),
            #[cfg(feature = "da")] Language::Danish => ::lang::da::make_pipeline(),
            #[cfg(feature = "du")] Language::Dutch => ::lang::du::make_pipeline(),
            #[cfg(feature = "fi")] Language::Finnish => ::lang::fi::make_pipeline(),
            #[cfg(feature = "fr")] Language::French => ::lang::fr::make_pipeline(),
            #[cfg(feature = "de")] Language::German => ::lang::de::make_pipeline(),
            #[cfg(feature = "it")] Language::Italian => ::lang::it::make_pipeline(),
            #[cfg(feature = "pt")] Language::Portuguese => ::lang::pt::make_pipeline(),
            #[cfg(feature = "ro")] Language::Romanian => ::lang::ro::make_pipeline(),
            #[cfg(feature = "ru")] Language::Russian => ::lang::ru::make_pipeline(),
            #[cfg(feature = "es")] Language::Spanish => ::lang::es::make_pipeline(),
            #[cfg(feature = "sv")] Language::Swedish => ::lang::sv::make_pipeline(),
            #[cfg(feature = "tr")] Language::Turkish => ::lang::tr::make_pipeline(),
            _ => panic!("Dont use the `__NonExhaustive` variant!"),
        }
    }
}

pub mod en;

#[cfg(feature = "da")]
pub mod da;
#[cfg(feature = "de")]
pub mod de;
#[cfg(feature = "du")]
pub mod du;
#[cfg(feature = "es")]
pub mod es;
#[cfg(feature = "fi")]
pub mod fi;
#[cfg(feature = "fr")]
pub mod fr;
#[cfg(feature = "it")]
pub mod it;
#[cfg(feature = "pt")]
pub mod pt;
#[cfg(feature = "ro")]
pub mod ro;
#[cfg(feature = "ru")]
pub mod ru;
#[cfg(feature = "sv")]
pub mod sv;
#[cfg(feature = "tr")]
pub mod tr;