linguini-codegen-ts 0.1.0-alpha.1

TypeScript code generator for Linguini localization projects
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

use linguini_cldr::{Operand, PluralRule, PluralRules, RelationOperator};

pub fn generate_plural_function(function_name: &str, rules: &PluralRules) -> String {
    let mut output = String::new();
    output.push_str(&format!(
        "export function {function_name}(value: number | string): string {{\n"
    ));
    output.push_str("  const operands = pluralOperands(value);\n");

    for category in rules
        .categories
        .iter()
        .filter(|category| category.category != "other")
    {
        output.push_str(&format!(
            "  if ({}) return \"{}\";\n",
            rule_expression(&category.rule),
            category.category
        ));
    }

    output.push_str("  return \"other\";\n");
    output.push_str("}\n\n");
    output.push_str(PLURAL_OPERANDS_HELPER);
    output
}

fn rule_expression(rule: &PluralRule) -> String {
    if rule.conditions.is_empty() {
        return "true".to_owned();
    }

    rule.conditions
        .iter()
        .map(|condition| {
            condition
                .relations
                .iter()
                .map(|relation| {
                    let value = operand_expression(relation.expression.operand);
                    let value = if let Some(modulo) = relation.expression.modulo {
                        format!("({value} % {modulo})")
                    } else {
                        value
                    };
                    relation_expression(&value, relation.operator, &relation.ranges.ranges)
                })
                .collect::<Vec<_>>()
                .join(" && ")
        })
        .map(|condition| format!("({condition})"))
        .collect::<Vec<_>>()
        .join(" || ")
}

fn relation_expression(
    value: &str,
    operator: RelationOperator,
    ranges: &[linguini_cldr::Range],
) -> String {
    let contains = ranges
        .iter()
        .map(|range| {
            if range.start == range.end {
                format!("{value} === {}", range.start)
            } else {
                format!("({value} >= {} && {value} <= {})", range.start, range.end)
            }
        })
        .collect::<Vec<_>>()
        .join(" || ");

    match operator {
        RelationOperator::Equal | RelationOperator::In | RelationOperator::Within => {
            format!("({contains})")
        }
        RelationOperator::NotEqual | RelationOperator::NotIn | RelationOperator::NotWithin => {
            format!("!({contains})")
        }
    }
}

fn operand_expression(operand: Operand) -> String {
    match operand {
        Operand::N => "operands.n",
        Operand::I => "operands.i",
        Operand::V => "operands.v",
        Operand::W => "operands.w",
        Operand::F => "operands.f",
        Operand::T => "operands.t",
        Operand::C => "operands.c",
        Operand::E => "operands.e",
    }
    .to_owned()
}

const PLURAL_OPERANDS_HELPER: &str = r#"function pluralOperands(value: number | string) {
  const source = String(value).replace(/^[+-]/, "");
  const [integer, fraction = ""] = source.split(".");
  const trimmedFraction = fraction.replace(/0+$/, "");

  return {
    n: Number(source),
    i: Number(integer),
    v: fraction.length,
    w: trimmedFraction.length,
    f: fraction === "" ? 0 : Number(fraction),
    t: trimmedFraction === "" ? 0 : Number(trimmedFraction),
    c: 0,
    e: 0,
  };
}
"#;

#[cfg(test)]
mod tests {
    use super::generate_plural_function;
    use linguini_cldr::load_plural_rules;

    const PLURALS: &str = r#"
    {
      "supplemental": {
        "plurals-type-cardinal": {
          "ru": {
            "pluralRule-count-one": "v = 0 and i % 10 = 1 and i % 100 != 11",
            "pluralRule-count-few": "v = 0 and i % 10 = 2..4 and i % 100 != 12..14",
            "pluralRule-count-many": "v = 0 and i % 10 = 0 or v = 0 and i % 10 = 5..9 or v = 0 and i % 100 = 11..14",
            "pluralRule-count-other": ""
          }
        }
      }
    }
    "#;

    #[test]
    fn generated_plural_function_snapshot_is_stable() {
        let rules = load_plural_rules(PLURALS, "ru").expect("rules");
        let output = generate_plural_function("pluralRu", &rules);

        assert_eq!(
            output,
            include_str!("../../../tests/fixtures/golden/snapshots/codegen-ts-plural-ru.ts")
        );
    }
}