/// <summary>
/// Make the specified str.
/// Creates evaluator object. Returns null if failed to parse.
/// </summary>
/// <param name='str'>
/// Text after "Plural-Forms:" (e.g. "nplurals=2; plural=(n != 1);").
/// </param>
public static PluralFormsCalculator Make(string str)
{
if (String.IsNullOrEmpty(str))
{
return(null);
}
if (str.EndsWith("\n"))
{
str = str.Remove(str.Length - 1, 1);
}
if (str.EndsWith("\\n"))
{
str = str.Remove(str.Length - 2, 2);
}
if (!str.EndsWith(";"))
{
str += ";";
}
PluralFormsCalculator calculator = new PluralFormsCalculator(str);
PluralFormsScanner scanner = new PluralFormsScanner(str);
PluralFormsParser p = new PluralFormsParser(scanner);
if (!p.Parse(calculator))
{
return(null);
}
return(calculator);
}
/// <summary>
/// Returns the index of the plural form to be chosen for a given number.
/// The default implementation is the Englis/Germanic/French plural formula:
/// See <see cref="DefaultPluralForms"/>
/// </summary>
protected virtual long PluralEval(long n)
{
PluralFormsCalculator pfc = PluralFormsCalculator.Make(PluralForms);
if (pfc != null)
{
return(pfc.Evaluate(n));
}
pfc = PluralFormsCalculator.Make(DefaultPluralForms);
if (pfc != null)
{
return(pfc.Evaluate(n));
}
return(n == 1 ? 0 : 1);
}
/// <summary>
/// Make the specified str.
/// Creates evaluator object. Returns null if failed to parse.
/// </summary>
/// <param name='str'>
/// Text after "Plural-Forms:" (e.g. "nplurals=2; plural=(n != 1);").
/// </param>
public static PluralFormsCalculator Make(string str)
{
if (String.IsNullOrEmpty(str))
return null;
if (str.EndsWith("\n"))
str = str.Remove(str.Length - 1, 1);
if (str.EndsWith("\\n"))
str = str.Remove(str.Length - 2, 2);
if (!str.EndsWith(";"))
str += ";";
PluralFormsCalculator calculator = new PluralFormsCalculator(str);
PluralFormsScanner scanner = new PluralFormsScanner(str);
PluralFormsParser p = new PluralFormsParser(scanner);
if (!p.Parse(calculator)) {
return null;
}
return calculator;
}
public bool Parse(PluralFormsCalculator calculator)
{
if (Token.TokenType != PluralFormsToken.Type.Nplurals)
return false;
if (! NextToken())
return false;
if (Token.TokenType != PluralFormsToken.Type.Assign)
return false;
if (! NextToken())
return false;
if (Token.TokenType != PluralFormsToken.Type.Number)
return false;
int nplurals = Token.Number;
if (! NextToken())
return false;
if (Token.TokenType != PluralFormsToken.Type.Semicolon)
return false;
if (! NextToken())
return false;
if (Token.TokenType != PluralFormsToken.Type.Plural)
return false;
if (! NextToken())
return false;
if (Token.TokenType != PluralFormsToken.Type.Assign)
return false;
if (! NextToken())
return false;
PluralFormsNode plural = ParsePlural();
if (plural == null)
return false;
if (Token.TokenType != PluralFormsToken.Type.Semicolon)
return false;
if (! NextToken())
return false;
if (Token.TokenType != PluralFormsToken.Type.Eof)
return false;
calculator.Init(nplurals, plural);
return true;
}
public bool Parse(PluralFormsCalculator calculator)
{
if (Token.TokenType != PluralFormsToken.Type.Nplurals)
{
return(false);
}
if (!NextToken())
{
return(false);
}
if (Token.TokenType != PluralFormsToken.Type.Assign)
{
return(false);
}
if (!NextToken())
{
return(false);
}
if (Token.TokenType != PluralFormsToken.Type.Number)
{
return(false);
}
int nplurals = Token.Number;
if (!NextToken())
{
return(false);
}
if (Token.TokenType != PluralFormsToken.Type.Semicolon)
{
return(false);
}
if (!NextToken())
{
return(false);
}
if (Token.TokenType != PluralFormsToken.Type.Plural)
{
return(false);
}
if (!NextToken())
{
return(false);
}
if (Token.TokenType != PluralFormsToken.Type.Assign)
{
return(false);
}
if (!NextToken())
{
return(false);
}
PluralFormsNode plural = ParsePlural();
if (plural == null)
{
return(false);
}
if (Token.TokenType != PluralFormsToken.Type.Semicolon)
{
return(false);
}
if (!NextToken())
{
return(false);
}
if (Token.TokenType != PluralFormsToken.Type.Eof)
{
return(false);
}
calculator.Init(nplurals, plural);
return(true);
}
