Fixed and improved lex.vim (second update)

[genivia-inc]

This update fixes highlighting of start condition scope with pattern starting with {. A regex pattern that starts with a { should not open a start condition scope.

With this update and the previous, fixes were applied to correct the following issues:

• Start condition states with a scope of the form <state>{ ... } are not recognized correctly, leading to highlighting errors below it such as %% not being highlighted.
• Action code is highlighted when enclosed in braces {...} but otherwise its is not, which is inconsistent.
• Indented initial code blocks (instead of placed in %{...%}) are not recognized and are not highlighted.
• Indented initial action code blocks are not recognized and not highlighted correctly, which appear right after the first %% and in start condition scopes
• initial action code blocks in %{...%} are not recognized in start condition scopes <state>{ ... }.
• The start condition state <*> is not recognized and not highlighted.
• //-comments are not always recognized and highlighted.
• Rule actions after patterns are not always highlighted, such as ECHO, which is inconsistent.
• Final code block is not always highlighted correctly when start condition states with scopes are used.
• Literal string quotes “...” are not highlighted in abbreviation definitions, whereas in patterns they are highlighted.
• %option are highlighted inconsistently when used before or after initial code blocks (both places are valid).
• Also highlighting of state declarations %s and %x are inconsistent or not highlighted at all when placed before initial code blocks.
• %top{ is not recognized, which should be the same as a %{ block, in principle any %name{ should be recognized.

[genivia-inc]

For clarification: the updated file causes a branch conflict with the previous update (I was a bit lazy not forking again). If you want, please go ahead to resolve the conflict to accept this update.

Also, I've uploaded an improved lex.vim file with our RE/flex repo (a more advanced Flex++ version) and opened a Vim issue for the Vim maintainers.

It would be wonderful if you could include a link to RE/flex on your page if possible. But it's up to you.

[justinmk]

merged 5906eea

[genivia-inc]

Thanks for helping the Vim, Flex, and Bison communities!

Please note that lex.vim is now officially integrated and released with Vim. A few more improvements were added to the final version. This final copy is located in the Vim syntax repo.

Thanks for referencing RE/Flex. It is a major overhaul of Flex++ with more advanced features and contributions.

[justinmk]

it's mentioned in the readme:
https://github.com/justinmk/vim-syntax-extra#bison-flex

[genivia-inc]

Thanks!! I hadn't seen it last time but noticed it just now.