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VHDL: Add support for "new" VHDL-2019 keywords #3104

Description

@Paebbels

The VHDL language (IEEE Std. 1076-2019) got new keywords, new attributes and new tool directives in 2019.

New keywords:

New attributes:

  • 'index
  • 'reflect
  • 'designated_subtype
  • 'record
  • 'converse

Besides, keywords and attributes, VHDL-2019 also got more tool directives. I'm not sure if this is already supported by pygments. If not, it would be another nice addition. Tool instructions are similar to preprocessor instructions in C.
See here: https://www.sigasi.com/tech/vhdl-conditional-analysis/


Do you need more information like EBNF?

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