Ross Patterson

Lexers need a "self" attribute similar to $parser for Parsers.

1

For the same reason that parsers need a `self`-like attribute in semantic predicates(_i.e._, `self` vs. `this` vs. ...), lexers do as well. [Commit 38c4e2b0028d2a305d0cf05ce5669d23d67ea88e](https://github.com/RossPatterson/antlr4/commit/38c4e2b0028d2a305d0cf05ce5669d23d67ea88e), back in 2014, added `$parser` for...

[rexx] Parse hexstrings and binarystrings correctly per ANSI standard.

1

Parse hexstrings and binarystrings correctly per ANSI standard. Fixes #2741. * Identify hexstrings and binarystrings in the parse tree by their own parser rules. * Do not accept hexstrings containing...

[rexx] Hexstrings and binarystrings aren't parsed correctly

2

Rexx has support for string literals in hexadecimal and binary. Hexstrings are, per ISO standard section 6.2.2.38, strings of traditional hex digits without regard to case, with optional blanks between...

[GrammarTest] Grammar tester doesn't support parsers with `options { superClass=...;}`

3

There doesn't seem to be a way to make the [grammar tester](https://github.com/antlr/grammars-v4/tree/master/_grammar-test) work for a grammar that uses `options {superClass=...;}`. Specifically, there doesn't appear to be a way to feed...

@KvanTTT had a suggestion for simplifying the change I made in PR #2746. Since that PR was already merged, here's a new one. He already reviewed the change over in...

[rexx] Add Python target support

2

The Rexx parser contains a small amount of Java code in a couple of semating predicates. There does not appear to be a way to accomplish the parse without the...

[rexx] Concatenation by abuttal and by whitespace are not supported

4

Rexx has a quirky definition for concatenation. In addition to the common case of an infix binary `||` operator, there are two more ways to concatenate values. The Rexx standard...

I found this during testing of PR #2855, but it's an existing problem. That change merely upgraded it from a hidden error to a test case failure. For example, the...

[rexx] Fix ambiguity between "assignment" and "command_", and search for others.

1

In [ANTLR discussion 3321](https://github.com/antlr/antlr4/discussions/3321#discussioncomment-3642335), @kaby76 wrote: > _But, even before this change, there is an ambiguity for input "binary_good1 = '1'b > " in [single_instruction](https://github.com/antlr/grammars-v4/blob/553522db0536ca80e0535351a19bdd8cbcc14e77/rexx/RexxParser.g4#L29), in choosing between [assignment](https://github.com/antlr/grammars-v4/blob/553522db0536ca80e0535351a19bdd8cbcc14e77/rexx/RexxParser.g4#L33) and...

[rexx] Separate dialects from ANSI standard Rexx

6

The current Rexx grammar supports several non-standard syntaxes. These are peculiar to one dialect of Rexx, and should be moved to a separate grammar that makes it clear which dialect...