FeatureList xText EBNF Version 2.0

• Core Features:

1. BNF front-end (Parser, Lexer, Linker, etc.)
2. translates a textual representation into an Ecore model
3. Editor - provides IDE features, e.g. auto-completion, syntax highlighting, etc.

• Validation Rules: these rules will give warnings in the editor if they find find consistencies in the code

1. checkUpdateGrammarConsistency: checks, if the grammar is an updated grammar, for consistencies between the originals and the new grammar e.g.: status: not migrated

2. CheckReferencedOnlyOnce: this should warn if there is a rule that is only referenced once, this is an inlining hint e.g.: status: migrated

3. checkPassthroughRule: e.g.:this tests if a rule gets just passed through a ::= b b ::= "literal" <=> a ::= "literal" , which is better for EBNF

4. checkEqualAlternative: this tests if a rule got equal alternatives e.g.: a::= d | d status: still some problems

5. checkDuplicateRules: checks if there is another rule in the EtsiBnf? , that got the same behaviour e.g.: a ::= "literal" | b c ::= "literal" | b status: migrated

6. checkSubruleDuplicates:

status: not migrated

7. check unused rule: it checks if a rule is used (exept for the rule with the number 1)

status: migrated

8. checkNameIsUnique: checks if the nam of a rule is already in use e.g.: a ::= "end" a ::= "fin"

status: migrated

• Generation:

-basic generation has been achieved but the output-format is unclear. Works with a Xtend-generator, momentary "xmi-like" output for a bnf grammar -old version had: mwe2 Generator and Xpand2 support

• it could generate mergeGrammars from CoreGrammars? and CompositeGrammars? from Merge grammars -seemingly it could produce a xsl-fo-file with the corresponding nodemodel

-new version: xsl-fo file for all bnf grammars (not for merge or deltagrammars) this can be Rendered to Pdf using apache-fop

• Formatting:

old: had some but they are got commented out in the main project

new: Line-break after every rule, white-spaces after all literals, possible update linebreak and double tab after all >|< bars

• Refactoring & Quickfixing:

1. auto Numbering of rules -not migrated
2. remove unused rules -migrated

1. replacement of passthroughRules -not migrated

1. refactor uppercasetokenRules -not migrated

1.find references, this one is standard in xtext2.* -renaming, this is standard in xtext2.*

*Grammar composition:

-3 grammartypes:

grammar: normal grammar deltagrammar: different notation for a extension grammar,

adds new rules to a grammar (regular rules)and adds changes to rules of the extended grammar(extension rules) -can be automaticly created

mergegrammar: for merging extensions

-old version had an automatic composition Process, for merge grammars, with a small pop-up-menu.

• at the moment no support in the new version

• Deploying:

-export project: Plug-in Development/deployable plug-ins and fragments -rcp project with a minimal eclipse editor