Subject: Exported From Confluence
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Compatibility is a complex issue, but we do our best to maintain=
ing three types of compatibilities between any two sequential =
versions of SSLR (e.g. between 1.17 and 1.18, but not between 1.16=
- binary compatibility: we don't guarantee that your code can be lin=
ked 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 a newer version of SSLR without any changes;=
- behavioral compatibility: in most cases (see below) your code=
will behave exactly as it did with the previous version of SSLR without an=
Also note that we don't provide any guarantee about compatibility with unre=
leased version. If you use snapshot version, then you do so at your ow=
We can't guarantee that your code can be compiled or linked with new ver=
sion of SSLR and behave exactly as before the upgrade in the following situ=
- You use internal classes or interfaces, i.e. those that are located und=
er package "org.sonar.sslr.internal".
- You create instances or subclasses of classes, which are not intended f=
or this. Such classes are marked by Javadoc ("This class is not i=
ntended to be instantiated or subclassed by clients").
- You implement interfaces which are not intended for this. Such interfac=
es are marked by Javadoc ("This interface is not intended to be implem=
ented by clients").
- You use methods marked as internal. Such methods are marked by annotati=
on "@VisibleForTesting" or by Javadoc ("For internal us=
- 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 maintain deprecated code as long as possible, but generally it=
may be removed in a the release after the one in which it was marked as de=
precated. That's why we highly recommend not to jump over two versions at o=
nce, but perform upgrades in several steps - one version per step. Eac=
h such step should include the removal of uses of deprecated code. Thus, it=
is recommended to upgrade as soon as a new version is available.
Recommended upgrade steps:
- Recompile your code with the next version of SSLR. If it can't be =
compiled, then don't hesitate to inform us.
- Check release notes and upgrade notes for the existence of behavioral i=
ncompatibilities (see below)=
. If there are any, you should fix them by following the instructions in th=
e notes. Good coverage of your code by unit tests is highly recommended (So=
narQube 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 he=
sitate to ask for help.
- Remove uses of deprecated code by following the instructions you'll fin=
d in the deprecation Javadocs (SonarQube can help you to find such code). A=
nd don't forget to execute tests to verify that regressions were not i=
ntroduced by such changes.
Sincerely yours, SonarSource Language Team.
SSLR 1.20 (not yet rel=
- Deprecation: The preprocessor API classes Preprocessor, Prepr=
ocessorAction and PreprocessingDirective were deprecated with no drop-=
in replacements. There no longer will be a unified API for preprocessors.=
- Deprecation: The text API package "org.sonar.sslr.text" has b=
een deprecated with no drop-in replacements. There no longer will be a comm=
on way to track the location of preprocessed source code.
- Source: Deprecated hamcrest matchers were removed in preference to Fest=
- Behavioral: No d=
ifference between usual grammar rule and "recovery rule" <=
span class=3D"s1" style=3D"line-height: 13.0pt;font-size: 10.0pt;">-=
both will be presen=
ted in AST and so can be handled via AST visitor. Thus ParseErrorCheck=
in SonarQube plugins must be reworked, if plugin uses "recovery rule&=
- Behavioral: Modifications made in grammar do not affect lexerless =
parser, which was created before those modifications.
- Behavioral: Previously was possible to execute parser with grammar=
, which contains references on undefined rules, but now this is forbidden.<=
- Behavioral: Replace AuditListener by AstScannerExceptionHandler to subscribe to errors
- Deprecation: Old ways to construct Grammars were marked as depreca=
ted - use Builders instead.
- If you extend "org.sonar.sslr.toolkit.AbstractConfigurationModel&q=
uot;, 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 lat=
er. Tip on migration: create new grammar (all tests pass as they don't=
depend on this grammar), migrate tests for grammar (they should pass), mig=
rate the rest (AST Visitors and so on).
- For lexerful grammar tests, setRootRule() can still be used, but Gramma=
r.rule() must be called
- Replace the calls to mock() by override("rule name"), do this=
before you change the names of all your rules
- To refactor the previous rule names (camel case) to the enum naming con=
vention (all caps and underscores), do: 1) For all rules, insert the unders=
cores by using the Eclipse rename binding, 2) then, for all rules, apply th=
e rename binding immediately followed by the "to upper case" one.=
Don't hesitate to commit in the middle in order to secure your changes, as=
Eclipse might go havoc...
- Behavioral: UnknownCharacterChannel can't be used to consume BOM c=
haracter - 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&q=
uot; for white spaces.
- Deprecation: Some methods for navigation in AstNode. Especially pa=
y attention on "hasChildren"=
; and "findChildren".
- Deprecation: The toolkit par=
ser and list of tokenizers is no more provided to the constructor of the &q=
uot;Toolkit" class. Instead, one must extend the "AbstractConfigu=
rationModel" class, where the "doGetParser()" and "doGe=
tTokenizer()" methods will be called when a parser for the current con=
figuration is needed.
- Distribution of Toolkit should em=
bed "com.google.guava:guava" instead of "com.google.collecti=
ons:google-collections" and thus it will have bigger size.
- 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: Rep=
lace the hamcrest parse() and notParse() matches by Fest ones: Use a global regular=
expression based find & replace: "assertThat\(p, parse\((.*?)\)\)=
;" by ".matches\($1\)" and add the assertThat(Parser) and fi=
nal semicolon manually. Do the same for notParse().
- Source: Replace artifactId "sslr-devkit" by "sslr-toolki=
- Behavioral: Memoization is optional in lexerful parser and should =
be explicitly enabled, if this is required for your grammar. For examp=