/// <summary>
/// Resets variables to defaults, in preparation for loading
/// a new file.
/// </summary>
private void Init()
{
lock (_syncLock)
{
_storage = new Dictionary <string, Message>();
_headers = new Dictionary <string, string>();
_nplurals = 2;
_plural = "(n != 1)";
_pluralEvaluator = new DefaultPluralEvaluator();
}
}
/// <summary>
/// Loads plural information and evaluator, based plural forms string.
/// </summary>
/// <param name="pluralForms">Plural-Forms header.</param>
/// <example>
/// LoadPluralEvaluator("nplurals=2; plural=(n != 1);")
/// </example>
private void LoadPluralEvaluator(string pluralForms)
{
var match = Regex.Match(pluralForms, @"^nplurals=(?<nplurals>[0-9]+);\s*plural=(?<plural>[0-9n\?:\(\)!=\s%<>|&]+);?$");
if (!match.Success)
throw new ArgumentException("Invalid Plural-Forms value: " + pluralForms);
// Read number and rules
_nplurals = Convert.ToInt32(match.Groups["nplurals"].Value);
_plural = match.Groups["plural"].Value;
// Create script
var script = @"
using System;
using nettext;
public class PluralEvaluator : IPluralEvaluator
{
public int Eval(int n)
{
// A plural like `(n != 1)` would result in a bool
// in C#, use Convert to guarantee an int result.
return Convert.ToInt32(" + _plural + @");
}
}
";
// Prepare compiler
var compiler = new CSharpCodeProvider();
var parameters = new CompilerParameters();
parameters.ReferencedAssemblies.Add(typeof(IPluralEvaluator).Assembly.Location);
parameters.GenerateExecutable = false;
parameters.GenerateInMemory = true;
// Compile, throw if compilation failed
var result = compiler.CompileAssemblyFromSource(parameters, script);
foreach (CompilerError err in result.Errors)
throw new FormatException("Failed to compile plural evaluator: " + err.ErrorText);
// Get type
var type = result.CompiledAssembly.GetType("PluralEvaluator");
if (type == null)
throw new TypeLoadException("Failed to generate plural evaluator, no PluralEvaluator.");
// Instantiate evaluator
_pluralEvaluator = Activator.CreateInstance(type) as IPluralEvaluator;
if (_pluralEvaluator == null)
throw new TypeLoadException("Failed to generate plural evaluator, no IPluralEvaluator.");
}
/// <summary>
/// Resets variables to defaults, in preparation for loading
/// a new file.
/// </summary>
private void Init()
{
_storage = new Dictionary<string, Message>();
_headers = new Dictionary<string, string>();
_nplurals = 2;
_plural = "(n != 1)";
_pluralEvaluator = new DefaultPluralEvaluator();
}
/// <summary>
/// Loads plural information and evaluator, based plural forms string.
/// </summary>
/// <param name="pluralForms">Plural-Forms header.</param>
/// <example>
/// LoadPluralEvaluator("nplurals=2; plural=(n != 1);")
/// </example>
private void LoadPluralEvaluator(string pluralForms)
{
var match = Regex.Match(pluralForms, @"^nplurals=(?<nplurals>[0-9]+);\s*plural=(?<plural>[0-9n\?:\(\)!=\s%<>|&]+);?$");
if (!match.Success)
{
throw new ArgumentException("Invalid Plural-Forms value: " + pluralForms);
}
// Read number and rules
lock (_syncLock)
{
_nplurals = Convert.ToInt32(match.Groups["nplurals"].Value);
_plural = match.Groups["plural"].Value;
// Check for known evaluators
var knownEvaluator = DefaultPluralEvaluator.GetKnownEvaluator(pluralForms);
if (knownEvaluator != null)
{
_pluralEvaluator = knownEvaluator;
return;
}
// Create script
var script = @"
using System;
using nettext;
public class PluralEvaluator : IPluralEvaluator
{
public int Eval(int n)
{
// A plural like `(n != 1)` would result in a bool
// in C#, use Convert to guarantee an int result.
return Convert.ToInt32(" + _plural + @");
}
}
" ;
// Prepare compiler
var compiler = new CSharpCodeProvider();
var parameters = new CompilerParameters();
parameters.ReferencedAssemblies.Add(typeof(IPluralEvaluator).Assembly.Location);
parameters.GenerateExecutable = false;
parameters.GenerateInMemory = true;
// Compile, throw if compilation failed
var result = compiler.CompileAssemblyFromSource(parameters, script);
foreach (CompilerError err in result.Errors)
{
throw new FormatException("Failed to compile plural evaluator: " + err.ErrorText);
}
// Get type
var type = result.CompiledAssembly.GetType("PluralEvaluator");
if (type == null)
{
throw new TypeLoadException("Failed to generate plural evaluator, no PluralEvaluator.");
}
// Instantiate evaluator
_pluralEvaluator = Activator.CreateInstance(type) as IPluralEvaluator;
if (_pluralEvaluator == null)
{
throw new TypeLoadException("Failed to generate plural evaluator, no IPluralEvaluator.");
}
}
}
