Module ast

AST provides a set of Syntax Tree Nodes used to store the output of parse method that is used in test_condition method to evaluate whether a given PluralCategory should be used.

🚧 This code is considered unstable; it may change at any time, in breaking or non-breaking ways, including in SemVer minor releases. In particular, the `DataProvider` implementations are only guaranteed to match with this version's `*_unstable` providers. Use with caution.

Examples

use icu::plurals::provider::rules::reference::ast::*;
use icu::plurals::provider::rules::reference::parse_condition;

let input = "i = 1";

let ast = parse_condition(input.as_bytes()).expect("Parsing failed.");

assert_eq!(
    ast,
    Condition(vec![AndCondition(vec![Relation {
        expression: Expression {
            operand: Operand::I,
            modulus: None,
        },
        operator: Operator::Eq,
        range_list: RangeList(vec![RangeListItem::Value(Value(1))])
    }])])
);

Structs

• AndCondition
  An incomplete AST representation of a plural rule. Comprises a vector of Relations.
• Condition
  A complete AST representation of a plural rule’s condition. Comprises a vector of AndConditions.
• DecimalValue
  A decimal value used in samples.
• Expression
  An incomplete AST representation of a plural rule. Comprises an Operand and an optional modulo.
• RangeList
  An incomplete AST representation of a plural rule. Comprises a vector of RangeListItems.
• Relation
  An incomplete AST representation of a plural rule. Comprises an Expression, an Operator, and a RangeList.
• Rule
  A complete AST representation of a plural rule. Comprises a vector of AndConditions and optionally a set of Samples.
• SampleList
  A list of values used in samples.
• SampleRange
  A value range used in samples.
• Samples
  A sample of example values that match the given rule.
• Value
  An incomplete AST representation of a plural rule, representing one integer.

Enums

• Operand
  An incomplete AST representation of a plural rule. Comprises a char.
• Operator
  An enum of Relation operators for plural rules.
• RangeListItem
  An enum of items that appear in a RangeList: Range or a Value.