| public Execute ( Lexer lexer, ICharStream input, int startIndex ) : void | ||
| lexer | Lexer | The lexer instance. |
| input | ICharStream |
/// The input stream which is the source for the current token.
/// When this method is called, the current
/// |
| startIndex | int |
/// The token start index. This value may be passed to
/// |
| return | void | |
public virtual void Execute(Lexer lexer, ICharStream input, int startIndex)
{
bool requiresSeek = false;
int stopIndex = input.Index;
try
{
foreach (ILexerAction lexerAction in lexerActions)
{
ILexerAction action = lexerAction;
if (action is LexerIndexedCustomAction)
{
int offset = ((LexerIndexedCustomAction)action).Offset;
input.Seek(startIndex + offset);
action = ((LexerIndexedCustomAction)action).Action;
requiresSeek = (startIndex + offset) != stopIndex;
}
else
{
if (action.IsPositionDependent)
{
input.Seek(stopIndex);
requiresSeek = false;
}
}
action.Execute(lexer);
}
}
finally
{
if (requiresSeek)
{
input.Seek(stopIndex);
}
}
}
protected internal virtual void Accept(ICharStream input, LexerActionExecutor lexerActionExecutor, int startIndex, int index, int line, int charPos)
{
// seek to after last char in token
input.Seek(index);
this._line = line;
this.charPositionInLine = charPos;
if (lexerActionExecutor != null && recog != null)
{
lexerActionExecutor.Execute(recog, input, startIndex);
}
}