private void ParsePluralFormsHeader()
{
string pluralForms;
if (!Headers.TryGetValue(PluralFormsHeaderKey, out pluralForms)) return;
Script script = null;
try
{
var scanner = new ExpressionEvaluator.Scanner();
scanner.SetSource(pluralForms, 0);
var parser = new ExpressionEvaluator.Parser(scanner);
parser.Parse();
script = parser.Script;
} catch (Exception e)
{
throw new GettextException("Error parsing the plural forms header", e);
}
if (script == null) return;
var assignmentNplurals = script.Assignments.SingleOrDefault(x => x.Var == "nplurals");
var assignmentN = script.Assignments.SingleOrDefault(x => x.Var == "plural");
if (assignmentNplurals == null || assignmentN == null) return;
{
var state = new ExpressionState();
assignmentNplurals.Execute(state);
NPlurals = (int) state.GetVar("nplurals");
}
{
PluralExpression = assignmentN;
GetPluralIndex = n =>
{
var state = new ExpressionState();
state.SetVar("nplurals", NPlurals);
state.SetVar("n", n);
assignmentN.Execute(state);
return (int) state.GetVar("plural");
};
}
}
public override long Execute(ExpressionState state)
{
return state.GetVar(id);
}
