AspectJ is a JVM language and as such an extension of Java, providing new keywords and semantics. It is maintained within the Eclipse project and has a large user base.
AspectJLexer is very simple: It just subclasses JavaLexer, adds new keywords and takes care of a few AspectJ specialties I noticed when testing the lexer:
In declare precedence: TracingAspect, LoggingAspect the space before the colon is optional. If there is no space, JavaLexer thinks it has found a Java label. I have added special handling for that.
In declare @field: foo the @field is an AspectJ keyword rather than a Java annotation, so I also added special handling for that.
Disclaimer 1: I do not speak Python, so my code is probably awful.
Disclaimer 2: I do not claim AspectJLexer to be particularly well tested or sophisticated. It works very well for my AspectJ code, but I do not use all specialties of the language, so there might be some syntax highlighting issues I have missed. But I do think many users will be happy to get a Pygments highlighter for AspectJ.