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Compatibility is a complex issue, but we do our best in maintaining three types of compatibilities between two sequential versions of SSLR ( e.g. between 1.17 and 1.18, but not between 1.16 and 1.18 ):

  • binary compatibility: we don't guarantee that your code can be linked with new version without recompilation, however for most releases this might be possible;
  • source compatibility: in most cases (see below) you should be able to recompile your code with newer version of SSLR without any changes;
  • behavioral compatibility: in most cases (see below) your code will behave exactly as with previous version of SSLR without any changes.
Also note that we don't provide any guarantee about compatibility with unreleased version. If you use snapshot version, then you do it on own risk.

We can't guarantee that your code can be compiled or linked with new version of SSLR and will behave exactly as before upgrade in following situations:

  • You use internal classes or interfaces, i.e. those that are located under package "org.sonar.sslr.internal".
  • You create instances or subclasses of classes, which are not intended for this. Such classes are marked by Javadoc ("This class is not intended to be instantiated or subclassed by clients").
  • You implement interfaces, which are not intended for this. Such interfaces are marked by Javadoc ("This interface is not intended to be implemented by clients").
  • You use methods marked as internal. Such methods are marked by annotation "@VisibleForTesting" or by Javadoc ("For internal use only").
  • You use beta code. Such code is marked by annotation "@Beta".
  • You use deprecated code. Such code is marked by annotation "@Deprecated" and Javadoc.

We try to keep and maintain deprecated code as long as possible, but generally it can be removed in a next release after one, when it was marked as deprecated. That's why highly recommended to not jump over two versions at once, but perform upgrades in several steps - by one version per step. And such step should include removal of uses of deprecated code. Thus recommended to do an upgrade as soon as new version is available. Recommended way to do one step is:

  1. Recompile your code with next version of SSLR. If it can't be compiled, then don't hesitate to inform us about this.
  2. Check notes on release and upgrade about existence of behavioral incompatibilities (see below). If any, then you should fix them by following instructions in notes. Good coverage of your code by unit tests is highly recommended (Sonar can help you to enforce this), so you will be able to perform tests to verify that it behaves exactly as before upgrade. If not, then don't hesitate to ask help.
  3. Remove uses of deprecated code by following instructions from Javadocs (Sonar can help you to find such code). And don't forget to execute tests to verify that regressions were not introduced by such changes.

Sincerely yours, SonarSource Language Team.

Upgrade Notes

SSLR 1.19 (snapshot)

  • Behavioral: Modifications made in grammar do not affect parser, which was created before those modifications.
  • Deprecation: Old ways to construct Grammars were marked as deprecated - use Builders instead.

SSLR 1.18

  • If you extend "org.sonar.sslr.toolkit.AbstractConfigurationModel", then make sure to override method "getCharset".
  • Migration to new Grammar API is highly recommended, because most likely old API will be marked as deprecated in next release and fully removed later. Tip on migration: create new grammar (all tests pass as they don't depend on this grammar), migrate tests for grammar (they should pass), migrate the rest (AST Visitors and so on).

SSLR 1.17

  • Behavioral: UnknownCharacterChannel can't be used to consume BOM character - use new BOMCharacterChannel.
  • Behavioral: In grammars for lexerless parsing no need to use "GrammarOperators.token", but mandatory to use "GrammarOperators.commentTrivia" for comments and "GrammarOperators.skippedTrivia" for white spaces.
  • Deprecation: Some methods for navigation in AstNode. Especially pay attention on "hasChildren" and "findChildren".
  • Deprecation: The toolkit parser and list of tokenizers is no more provided to the constructor of the "Toolkit" class. Instead, one must extend the "AbstractConfigurationModel" class, where the "doGetParser()" and "doGetTokenizer()" methods will be called when a parser for the current configuration is needed.
  • Distribution of Toolkit should embed "" instead of "" and thus it will have bigger size.

SSLR 1.16

  • Deprecation: Replace "GrammarFunctions.Standard.or(" by "GrammarFunctions.Standard.firstOf(". In most cases you should be able to do this by using "find text and replace".
  • Deprecation: Replace hamcrest matchers by fest-assertions. In order to quickly replace all assertThat(p, parse("XXXXXX")); by assertThat(p).matches("XXXXXXX"); you can use the following regular expression to do a search and replace (tested in Eclipse by Julien Henry):
    • Find: (?s)assertThat\(p\,\sparse\((.*?)\)\)\;
    • Replace with: assertThat(p).matches($1);
    • You can do the same for notParse => notMatches

SSLR 1.15

  • Source: Replace artifactId "sslr-devkit" by "sslr-toolkit".

SSLR 1.14

  • Behavioral: Memoization is optional and should be explicitly enabled, if this is required for your grammar. For example this is the case for C#, C, JavaScript, Python grammars.


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