private Expression ParseDirectiveExpression(DothtmlDirectiveNode directive, BindingParserNode expressionSyntax)
{
TypeRegistry registry;
if (expressionSyntax is AssemblyQualifiedNameBindingParserNode)
{
var assemblyQualifiedName = expressionSyntax as AssemblyQualifiedNameBindingParserNode;
expressionSyntax = assemblyQualifiedName.TypeName;
registry = TypeRegistry.DirectivesDefault(compiledAssemblyCache, assemblyQualifiedName.AssemblyName.ToDisplayString());
}
else
{
registry = TypeRegistry.DirectivesDefault(compiledAssemblyCache);
}
var visitor = new ExpressionBuildingVisitor(registry)
{
ResolveOnlyTypeName = true,
Scope = null
};
try
{
return(visitor.Visit(expressionSyntax));
}
catch (Exception ex)
{
directive.AddError($"{expressionSyntax.ToDisplayString()} is not a valid type or namespace: {ex.Message}");
return(null);
}
}
public IAbstractImportDirective BuildImportDirective(
DothtmlDirectiveNode node,
BindingParserNode aliasSyntax,
BindingParserNode nameSyntax)
{
foreach (var syntaxNode in nameSyntax.EnumerateNodes().Concat(aliasSyntax?.EnumerateNodes() ?? Enumerable.Empty <BindingParserNode>()))
{
syntaxNode.NodeErrors.ForEach(node.AddError);
}
var visitor = new ExpressionBuildingVisitor(TypeRegistry.DirectivesDefault)
{
ResolveOnlyTypeName = true,
Scope = null
};
Expression expression;
try
{
expression = visitor.Visit(nameSyntax);
}
catch (Exception ex)
{
node.AddError($"{nameSyntax.ToDisplayString()} is not a valid type or namespace: {ex.Message}");
return(new ResolvedImportDirective(aliasSyntax, nameSyntax, null)
{
DothtmlNode = node
});
}
if (expression is UnknownStaticClassIdentifierExpression)
{
var namespaceValid = expression
.CastTo <UnknownStaticClassIdentifierExpression>().Name
.Apply(ReflectionUtils.IsAssemblyNamespace);
if (!namespaceValid)
{
node.AddError($"{nameSyntax.ToDisplayString()} is unknown type or namespace.");
}
return(new ResolvedImportDirective(aliasSyntax, nameSyntax, null)
{
DothtmlNode = node
});
}
else if (expression is StaticClassIdentifierExpression)
{
return(new ResolvedImportDirective(aliasSyntax, nameSyntax, expression.Type)
{
DothtmlNode = node
});
}
node.AddError($"{nameSyntax.ToDisplayString()} is not a type or namespace.");
return(new ResolvedImportDirective(aliasSyntax, nameSyntax, null));
}
public Expression Parse(string expression, DataContextStack dataContexts, BindingParserOptions options)
{
try
{
var tokenizer = new BindingTokenizer();
tokenizer.Tokenize(new StringReader(expression));
var parser = new BindingParser();
parser.Tokens = tokenizer.Tokens;
var node = parser.ReadExpression();
if (!parser.OnEnd())
{
throw new BindingCompilationException(
$"Unexpected token '{expression.Substring(0, parser.Peek().StartPosition)} ---->{parser.Peek().Text}<---- {expression.Substring(parser.Peek().StartPosition + parser.Peek().Length)}'",
null, new TokenBase[] { parser.Peek() });
}
foreach (var n in node.EnumerateNodes())
{
if (n.HasNodeErrors) throw new BindingCompilationException(string.Join(", ", n.NodeErrors), n);
}
var symbols = InitSymbols(dataContexts);
symbols = options.AddTypes(symbols);
var visitor = new ExpressionBuildingVisitor(symbols);
visitor.Scope = symbols.Resolve(options.ScopeParameter);
return visitor.Visit(node);
}
catch (Exception ex)
{
ex.ForInnerExceptions<BindingCompilationException>(bce =>
{
if (bce.Expression == null) bce.Expression = expression;
});
throw;
}
}
