Fix for dangling else problem
Aaron Michaux
Cannot find any principled way to suppress warnings RE the dangling else problem in ANLTR4. In fact, neither "language implementation patterns" nor "The Definitive ANTLR4 Reference" even mention it! Previously posted solutions are no longer supported in the latest version of ANTLR.
I'm curious: can someone knowledgeable give some background for why ANTLR4 doesn't seem to address this issue. I'm sure there is a good reason. If there is a principled way to approach the issue, where one can choose what ANTLR does, and suppress any warnings, because ANTLR knows that you've told it to do the right thing?
Sam Harwell
The Java 8 grammar in one of my branches uses the grammar to handle this case:
Then, in order for this grammar to produce a usable parse tree, I implemented the “baseContext” option to allow multiple rules in the grammar to share a single parse tree representation. For example, the ifThenStatement and ifThenElseStatement both produce a IfThenElseStatementContext parse tree node, but only the latter actually allows an else statement to appear. The feature is part of a pull request to ANTLR 4 (antlr/antlr4#697) but not yet accepted. If you need it in the meantime you can try using my fork of the project which includes it.
Sam
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