Introduction

IPluralRule is interface for pluralization rule evaluator.

/// <summary>Plurality rule, evaluatable.</summary>
public interface IPluralRule
{
    /// <summary>Metadata info record.</summary>
    PluralRuleInfo Info { get; }

    /// <summary>Evaluate whether any of the associated rules apply to <paramref name="number"/>.</summary>
    /// <param name="number">numeric or text representation of numeric value</param>
    bool Evaluate<N>(N number) where N : IPluralNumber;
}

PluralRule.Expression(pluralRuleInfo, expression) creates rule from expression.

PluralRuleInfo info = new PluralRuleInfo("PluralRules", "cardinal", "fi", "one", true);
IExpression expression = new BinaryOpExpression(BinaryOp.Equal, new ArgumentNameExpression("i"), new ConstantExpression(new TextNumber("0", CultureInfo.InvariantCulture)));
IPluralRule rule = new PluralRule.Expression(info, expression);

PluralRule.Zero is rule that evaluates true when compared to zero valued string, e.g. "0000".

PluralRuleInfo info = new PluralRuleInfo("PluralRules", "cardinal", "fi", "zero", true);
IPluralRule rule = new PluralRule.Zero(info);

PluralRule.True is rule that always evaluates true, can be used as fallback rule in rule list.

PluralRuleInfo info = new PluralRuleInfo("PluralRules", "cardinal", "fi", "other", true);
IPluralRule rule = new PluralRule.True(info);

PluralRule.Empty is rule that always evaluates true to empty value string.

PluralRuleInfo info = new PluralRuleInfo("PluralRules", "cardinal", "fi", "", true);
IPluralRule rule = new PluralRule.Empty(info);

Full Example

Full example

using System.Globalization;
using Avalanche.Localization;
using Avalanche.Localization.Pluralization;

class pluralrule
{
    public static void Run()
    {
        {
            // <01>
            PluralRuleInfo info = new PluralRuleInfo("PluralRules", "cardinal", "fi", "one", true);
            IExpression expression = new BinaryOpExpression(BinaryOp.Equal, new ArgumentNameExpression("i"), new ConstantExpression(new TextNumber("0", CultureInfo.InvariantCulture)));
            IPluralRule rule = new PluralRule.Expression(info, expression);
            // </01>
        }
        {
            // <02>
            PluralRuleInfo info = new PluralRuleInfo("PluralRules", "cardinal", "fi", "zero", true);
            IPluralRule rule = new PluralRule.Zero(info);
            // </02>
        }
        {
            // <03>
            PluralRuleInfo info = new PluralRuleInfo("PluralRules", "cardinal", "fi", "other", true);
            IPluralRule rule = new PluralRule.True(info);
            // </03>
        }
        {
            // <04>
            PluralRuleInfo info = new PluralRuleInfo("PluralRules", "cardinal", "fi", "", true);
            IPluralRule rule = new PluralRule.Empty(info);
            // </04>
        }
    }
}