private static RootNodeDefinition ParseSyntax(
string fbsPath,
IIncludeLoader includeLoader)
{
string rootPath = Path.GetFullPath(fbsPath);
// First, visit includes. We need to figure out which files warrant a thorough look.
HashSet <string> includes = new HashSet <string>()
{
rootPath
};
Queue <string> visitOrder = new Queue <string>();
visitOrder.Enqueue(rootPath);
var rootNode = new RootNodeDefinition(rootPath);
var schemaVisitor = new SchemaVisitor(rootNode);
// SHA256 -> 32 bytes.
byte[] hash = new byte[32];
string asmVersion = typeof(FlatSharpCompiler).Assembly.GetCustomAttribute <AssemblyFileVersionAttribute>()?.Version ?? "unknown";
Encoding.UTF8.GetBytes(asmVersion, 0, asmVersion.Length, hash, 0);
while (visitOrder.Count > 0)
{
string next = visitOrder.Dequeue();
string fbs = includeLoader.LoadInclude(next);
using (var sha256 = SHA256Managed.Create())
{
byte[] componentHash = sha256.ComputeHash(Encoding.UTF8.GetBytes(fbs));
for (int i = 0; i < hash.Length; ++i)
{
hash[i] ^= componentHash[i];
}
}
schemaVisitor.CurrentFileName = next;
// Traverse the graph of includes.
var includeVisitor = new IncludeVisitor(next, includes, visitOrder);
ErrorContext.Current.WithScope(next, () =>
{
var schema = GetParser(fbs).schema();
ErrorContext.Current.ThrowIfHasErrors();
includeVisitor.Visit(schema);
ErrorContext.Current.ThrowIfHasErrors();
schemaVisitor.Visit(schema);
ErrorContext.Current.ThrowIfHasErrors();
});
}
rootNode.InputHash = $"{asmVersion}.{Convert.ToBase64String(hash)}";
return(rootNode);
}
private static BaseSchemaMember ParseSyntax(string fbsSchema, string inputHash)
{
AntlrInputStream input = new AntlrInputStream(fbsSchema);
FlatBuffersLexer lexer = new FlatBuffersLexer(input);
CommonTokenStream tokenStream = new CommonTokenStream(lexer);
FlatBuffersParser parser = new FlatBuffersParser(tokenStream);
parser.AddErrorListener(new CustomErrorListener());
SchemaVisitor visitor = new SchemaVisitor(inputHash);
BaseSchemaMember rootNode = visitor.Visit(parser.schema());
return(rootNode);
}