public AstContainer Parse(StringSource source)
{
try
{
// Create tokenizer
_tokenizer = new Tokenizer(source);
// Create AST container
var container = new AstContainer(source.DisplayName);
container.SourcePosition = _tokenizer.Source.CreatePosition(0);
// Parse all elements
ParseIntoContainer(container);
// Should be at EOF?
_tokenizer.CheckToken(Token.EOF);
// Return the container
return(container);
}
catch
{
_tokenizer = null;
throw;
}
}
private void ParseIntoContainer(AstContainer container)
{
while (_tokenizer.Token != Token.EOF)
{
try
{
var pos = _tokenizer.TokenPosition;
// Check for container terminators
if (_tokenizer.Token == Token.Identifier)
{
switch (_tokenizer.TokenString.ToUpperInvariant())
{
case "ENDIF":
case "ELSE":
case "ELSEIF":
case "ENDP":
case "ENDM":
return;
}
}
// Parse an element
var elem = ParseAstElement();
// Anything returned?
if (elem != null)
{
elem.SourcePosition = pos;
container.AddElement(elem);
}
// Unless it's a label, we should hit EOL after each element
if (!(elem is AstLabel))
{
_tokenizer.SkipToken(Token.EOL);
}
}
catch (CodeException x)
{
// Log error
Log.Error(x.Position, x.Message);
// Skip to next line
while (_tokenizer.Token != Token.EOF && _tokenizer.Token != Token.EOL)
{
try
{
_tokenizer.Next();
}
catch (CodeException)
{
// Ignore other parse errors on this line
}
}
}
}
}
public AstInclude(string filename, AstContainer content)
{
_filename = filename;
_content = content;
}