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    • Avalanche.Template
      • Introduction
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    IPluralRules

    IPluralRules is a record that contains rule providers.

    /// <summary>Table containing providers for plural rules. May contain one or multiple rulesets.</summary>
    /// <example>
    /// category=cardinal
    ///      case="zero":     "no cars"
    ///      case="one":      "a car"
    ///      case="other":    "{0} cars"
    ///      
    /// category=ordinal
    ///      case="one":      "Take first exit out."
    ///      case="two":      "Take second exit out."
    ///      case="few":      "Take third exit out."
    ///      case="other":    "Take {0}th exit out."
    /// </example>
    public interface IPluralRules
    {
        /// <summary>All rules</summary>
        IPluralRule[] AllRules { get; set; }
    
        /// <summary>Queries rules</summary>
        IProvider<PluralRuleInfo, IPluralRule[]> Rules { get; set; }
        /// <summary>Queries and caches rules</summary>
        IProvider<PluralRuleInfo, IPluralRule[]> RulesCached { get; set; }
        /// <summary>Creates rule evaluator</summary>
        IProvider<PluralRuleInfo, IPluralRulesEvaluator> Evaluator { get; set; }
        /// <summary>Creates and caches rule evaluator</summary>
        IProvider<PluralRuleInfo, IPluralRulesEvaluator> EvaluatorCached { get; set; }
    }
    

    IPluralRulesEvaluator evaluates strings against associated rules.

    /// <summary>Evaluates numbers against rules.</summary>
    public interface IPluralRulesEvaluator
    {
        /// <summary>
        /// Evaluates <paramref name="number"/> against sub-set of rules.
        /// 
        /// First array elements are optional rules, and the last array element is mandatory rule.
        /// </summary>
        /// <param name="number">(optional) numeric and text representation of numberic value</param>
        /// <returns>Matching cases, first ones are optional, the last one is always mandatory (and only mandatory). Or null if evaluate failed.</returns>
        IPluralRule[]? Evaluate<N>(N number) where N : IPluralNumber;
    }
    

    .Query(ruleset, category, culture, case, required) queries for a sub-set of rules.

    // Read plurals.xml and ordinals.xml (from cldr-common-40.0.zip)
    IPluralRule[] rulearray =
        CLDRs.PluralReader("plurals.xml", "Unicode.CLDR40")
             .Concat(CLDRs.PluralReader("ordinals.xml", "Unicode.CLDR40"))
             .ToArray();
    // Query "fi" rules
    IPluralRule[] fi_rules = rulearray.Query(
        ruleset: null,
        category: null,
        culture: "fi",
        @case: null,
        required: null
    );
    // Print rules
    foreach (IPluralRule rule in fi_rules) WriteLine(rule);
    // [RuleSet=Unicode.CLDR40,Category=cardinal,Culture=fi,Case=one,Required=True] i=1 and v=0
    // [RuleSet=Unicode.CLDR40,Category=cardinal,Culture=fi,Case=other,Required=True]
    // [RuleSet=Unicode.CLDR40,Category=ordinal,Culture=fi,Case=other,Required=True]
    

    PluralRules(enumerable) adapts rule enumerable into rule providers.

    IPluralRules rules = new PluralRules(rulearray);
    

    .RulesCached[query] queries and caches result. The constant PluralRuleInfo.NEWEST returns rules from the latest rule-set. CLDRs.PluralRules contains all builtin rules.

    // Get intrinsic rules
    IPluralRules rules = CLDRs.All;
    // Get german rules 
    IPluralRule[] de_rules = rules.RulesCached[(PluralRuleInfo.NEWEST, "cardinal", "de", null, null)];
    // Print rules
    foreach (IPluralRule rule in de_rules) WriteLine(rule);
    // [RuleSet=Unicode.CLDR40,Category=cardinal,Culture=de,Case=zero,Required=False] n=0
    // [RuleSet=Unicode.CLDR40,Category=cardinal,Culture=de,Case=one,Required=True] i=1 and v=0
    // [RuleSet=Unicode.CLDR40,Category=cardinal,Culture=de,Case=other,Required=True] true
    

    .EvaluatorCached[query] queries for evaluator and caches result.

    // Get german cardinal rule evaluator
    IPluralRulesEvaluator de_evaluator = rules.EvaluatorCached[(PluralRuleInfo.NEWEST, "cardinal", "de", null, null)];
    

    Evaluator compares string against plurality rules. Result is an array of matching rules. Highest priority is first, lowest last.

    // Text representation of the number
    string text = "100.0";
    // Create number feature extraction
    TextNumber textNumber = new TextNumber(text);
    // Evaluate rule
    IPluralRule[]? matching_rules = de_evaluator.Evaluate<TextNumber>(textNumber);
    // Get first matching case
    WriteLine(matching_rules![0].Info.Case); // "other"
    

    Full Example

    Full example
    using Avalanche.Localization;
    using Avalanche.Localization.Pluralization;
    using static System.Console;
    
    class pluralrules
    {
        public static void Run()
        {
            {
                // <01>
                // Read plurals.xml and ordinals.xml (from cldr-common-40.0.zip)
                IPluralRule[] rulearray =
                    CLDRs.PluralReader("plurals.xml", "Unicode.CLDR40")
                         .Concat(CLDRs.PluralReader("ordinals.xml", "Unicode.CLDR40"))
                         .ToArray();
                // Query "fi" rules
                IPluralRule[] fi_rules = rulearray.Query(
                    ruleset: null,
                    category: null,
                    culture: "fi",
                    @case: null,
                    required: null
                );
                // Print rules
                foreach (IPluralRule rule in fi_rules) WriteLine(rule);
                // [RuleSet=Unicode.CLDR40,Category=cardinal,Culture=fi,Case=one,Required=True] i=1 and v=0
                // [RuleSet=Unicode.CLDR40,Category=cardinal,Culture=fi,Case=other,Required=True]
                // [RuleSet=Unicode.CLDR40,Category=ordinal,Culture=fi,Case=other,Required=True]
                // </01>
    
                // <02>
                IPluralRules rules = new PluralRules(rulearray);
                // </02>
            }
            {
                // <03>
                // Get intrinsic rules
                IPluralRules rules = CLDRs.All;
                // Get german rules 
                IPluralRule[] de_rules = rules.RulesCached[(PluralRuleInfo.NEWEST, "cardinal", "de", null, null)];
                // Print rules
                foreach (IPluralRule rule in de_rules) WriteLine(rule);
                // [RuleSet=Unicode.CLDR40,Category=cardinal,Culture=de,Case=zero,Required=False] n=0
                // [RuleSet=Unicode.CLDR40,Category=cardinal,Culture=de,Case=one,Required=True] i=1 and v=0
                // [RuleSet=Unicode.CLDR40,Category=cardinal,Culture=de,Case=other,Required=True] true
                // </03>
                // <04>
                // Get german cardinal rule evaluator
                IPluralRulesEvaluator de_evaluator = rules.EvaluatorCached[(PluralRuleInfo.NEWEST, "cardinal", "de", null, null)];
                // </04>
    
                // <05>
                // Text representation of the number
                string text = "100.0";
                // Create number feature extraction
                TextNumber textNumber = new TextNumber(text);
                // Evaluate rule
                IPluralRule[]? matching_rules = de_evaluator.Evaluate<TextNumber>(textNumber);
                // Get first matching case
                WriteLine(matching_rules![0].Info.Case); // "other"
                // </05>
            }
    
        }
    }
    
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