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

extern crate unicase;

use unicase::UniCase;

fn ends_with_roman_numeral(name: &str) -> bool {
    name.split_whitespace().rev().next().map_or(false, |n| {
        n.chars().all(|c| c == 'I' || c == 'V' || c == 'X')
    })
}

fn ends_with_numeric(name: &str) -> bool {
    name.chars().last().map_or(false, |c| c.is_numeric())
}

fn series_subtitle_handling(name: &str, split_token: &str, list: &mut Vec<String>) -> bool {
    let mut iter = name.splitn(2, split_token);
    if let (Some(series), Some(subtitle)) = (iter.next(), iter.next()) {
        let series_abbreviations = abbreviate(series);
        let subtitle_abbreviations = abbreviate(subtitle);
        let series_trimmed = series.trim_end();

        let is_series_representative =
            ends_with_numeric(series_trimmed) || ends_with_roman_numeral(series_trimmed);

        let is_there_only_one_series_abbreviation = series_abbreviations.len() == 1;

        for subtitle_abbreviation in &subtitle_abbreviations {
            for series_abbreviation in &series_abbreviations {
                if is_series_representative
                    || series_abbreviation != series
                    || is_there_only_one_series_abbreviation
                {
                    list.push(format!(
                        "{}{}{}",
                        series_abbreviation, split_token, subtitle_abbreviation
                    ));
                }
            }
        }

        if is_series_representative {
            list.extend(series_abbreviations);
        }
        list.extend(subtitle_abbreviations);

        true
    } else {
        false
    }
}

fn left_right_handling(name: &str, split_token: &str, list: &mut Vec<String>) -> bool {
    let mut iter = name.splitn(2, split_token);
    if let (Some(series), Some(subtitle)) = (iter.next(), iter.next()) {
        let series_abbreviations = abbreviate(series);
        let subtitle_abbreviations = abbreviate(subtitle);

        for subtitle_abbreviation in &subtitle_abbreviations {
            for series_abbreviation in &series_abbreviations {
                list.push(format!(
                    "{}{}{}",
                    series_abbreviation, split_token, subtitle_abbreviation
                ));
            }
        }

        true
    } else {
        false
    }
}

fn and_handling(name: &str, list: &mut Vec<String>) -> bool {
    let and = UniCase::new("and");
    for word in name.split_whitespace() {
        if UniCase::new(word) == and {
            let index = word.as_ptr() as usize - name.as_ptr() as usize;
            let (left, rest) = name.split_at(index);
            let right = &rest[word.len()..];
            let name = format!("{}&{}", left, right);
            list.extend(abbreviate(&name));
            return true;
        }
    }
    false
}

fn remove_prefix_word<'a>(text: &'a str, word: &str) -> Option<&'a str> {
    let first_word = text.split_whitespace().next()?;
    if unicase::eq(first_word, word) {
        Some(text[first_word.len()..].trim_start())
    } else {
        None
    }
}

fn is_all_caps_or_digits(text: &str) -> bool {
    text.chars().all(|c| c.is_uppercase() || c.is_numeric())
}

pub fn abbreviate(name: &str) -> Vec<String> {
    let name = name.trim();
    let mut list = vec![name.into()];
    if name.is_empty() {
        return list;
    }

    let parenthesis = name
        .char_indices()
        .rev()
        .find(|&(_, c)| c == '(')
        .and_then(|(start, _)| {
            name[start + 1..]
                .char_indices()
                .find(|&(_, c)| c == ')')
                .map(|(end, _)| (start, end + 2))
        });

    if let Some((start, end)) = parenthesis {
        let (before_parenthesis, rest) = name.split_at(start);
        let after_parenthesis = &rest[end..];
        let name = format!(
            "{} {}",
            before_parenthesis.trim_end(),
            after_parenthesis.trim_start()
        );
        list.extend(abbreviate(&name));
    } else if series_subtitle_handling(&name, ": ", &mut list)
        || series_subtitle_handling(&name, " - ", &mut list)
        || left_right_handling(&name, " | ", &mut list)
        || and_handling(&name, &mut list)
    {
    } else {
        if let Some(rest) =
            remove_prefix_word(name, "the").or_else(|| remove_prefix_word(name, "a"))
        {
            list.push(rest.into());
        }

        if name.contains(char::is_whitespace) {
            let mut abbreviated = String::new();
            for word in name.split(|c: char| c.is_whitespace() || c == '-') {
                if let Some(first_char) = word.chars().next() {
                    let word_mapped = word.chars().map(|c| if c == '&' { 'a' } else { c });

                    if first_char.is_numeric() {
                        abbreviated.extend(word_mapped);
                    } else if word.len() <= 4 && is_all_caps_or_digits(word) {
                        if !abbreviated.is_empty() {
                            abbreviated.push(' ');
                        }
                        abbreviated.extend(word_mapped);
                    } else {
                        abbreviated.push(first_char);
                    }
                }
            }
            list.push(abbreviated);
        }
    }

    list.sort_unstable();
    list.dedup();

    list
}