public static bool TryWrite(this IExpression expression, TextWriter writer, Scope scope)
{
var errors = new List <FluentError>();
if (expression is IInlineExpression inlineExpression)
{
inlineExpression.Write(writer, scope);
}
else if (expression is SelectExpression selectExpression)
{
var selector = selectExpression.Selector.Resolve(scope);
if (selector is FluentString or FluentNumber)
{
foreach (var variant in selectExpression.Variants)
{
IFluentType key;
switch (variant.Type)
{
case VariantType.NumberLiteral:
key = FluentNumber.TryNumber(variant.Key.Span);
break;
default:
key = new FluentString(variant.Key.Span);
break;
}
if (key.Matches(selector, scope))
{
variant.Value.Write(writer, scope);
return(scope.Errors.Count == 0);
}
}
}
for (var i = 0; i < selectExpression.Variants.Count; i++)
{
var variant = selectExpression.Variants[i];
if (variant.IsDefault)
{
variant.Value.Write(writer, scope);
return(errors.Count == 0);
}
}
errors.Add(ResolverFluentError.MissingDefault());
}
return(scope.Errors.Count == 0);
}
public static IFluentType Resolve(this IInlineExpression self, Scope scope)
{
if (self is TextLiteral textLiteral)
{
StringWriter stringWriter = new();
UnicodeUtil.WriteUnescapedUnicode(textLiteral.Value, stringWriter);
return((FluentString)stringWriter.ToString());
}
if (self is NumberLiteral numberLiteral)
{
return(FluentNumber.TryNumber(numberLiteral.Value.Span));
}
if (self is VariableReference varRef)
{
var args = scope.LocalArgs ?? scope.Args;
if (args != null &&
args.TryGetValue(varRef.Id.ToString(), out var arg))
{
return(arg.Copy());
}
if (scope.LocalArgs == null)
{
scope.AddError(ResolverFluentError.UnknownVariable(varRef));
}
return(new FluentErrType());
}
var writer = new StringWriter();
self.TryWrite(writer, scope);
return((FluentString)writer.ToString());
}
private static void Write(this IInlineExpression self, TextWriter writer, Scope scope)
{
if (self is TextLiteral textLiteral)
{
UnicodeUtil.WriteUnescapedUnicode(textLiteral.Value, writer);
return;
}
if (self is NumberLiteral numberLiteral)
{
var value = FluentNumber.TryNumber(numberLiteral.Value.Span);
value.Write(writer, scope);
return;
}
if (self is MessageReference msgRef)
{
ProcessMsgRef(self, writer, scope, msgRef);
return;
}
if (self is TermReference termRef)
{
var res = scope.GetArguments(termRef.Arguments);
scope.SetLocalArgs(res.Named);
if (scope.Bundle.TryGetAstTerm(termRef.Id.ToString(), out var term))
{
var attrName = termRef.Attribute;
var attr = term
.Attributes
.Find(a => a.Id.Equals(attrName));
scope.Track(writer, attr != null ? attr.Value : term.Value, self);
}
else
{
scope.WriteRefError(writer, self);
}
scope.SetLocalArgs(null);
return;
}
if (self is FunctionReference funcRef)
{
var(resolvedPosArgs, resolvedNamedArgs) = scope.GetArguments(funcRef.Arguments);
if (scope.Bundle.TryGetFunction(funcRef.Id, out var func))
{
var result = func.Function(resolvedPosArgs, resolvedNamedArgs);
if (result.IsError())
{
self.WriteError(writer);
}
else
{
writer.Write(result.AsString());
}
}
else
{
scope.WriteRefError(writer, self);
}
}
if (self is VariableReference varRef)
{
var id = varRef.Id;
var args = scope.LocalArgs ?? scope.Args;
if (args != null &&
args.TryGetValue(id.ToString(), out var arg))
{
arg.Write(writer, scope);
}
else
{
if (scope.LocalArgs == null)
{
scope.AddError(ResolverFluentError.Reference(self));
}
writer.Write('{');
self.WriteError(writer);
writer.Write('}');
}
}
if (self is Placeable placeable)
{
placeable.Expression.TryWrite(writer, scope);
}
}
