Algol

[DecimalTurn]

Language name

Algol
aka. Algol 60 or Algol 68

URL of example repository

• https://github.com/yves147/algol-60
• https://github.com/JvanKatwijk/algol-60-compiler

URL of syntax highlighting grammar

• https://github.com/jlguenego/vscode-algol68 4 ⭐
• https://github.com/PolariTOON/language-algol60 5 ⭐

Most popular extensions

• .a68 (1k files)
• .a60 (1.8k files)
• .alg (15.6k files):
  • With regex search (2k files): https://github.com/search?q=path%3A*.alg+AND+%28%2F%5Ecomment%5Cb.*%28%3B%7Ccomment%29%2F+OR+%2F%5Ebegin%5B%5Cs%5CS%5D*%5Eend%2F+OR++%2F%3A%3D+%5Cd%2F+OR+%2F%23define%2F+OR+%2Falgol%2F%29+NOT+is%3Afork&type=code

Detected language

None

[DecimalTurn]

Seems like the .alg extension has reached the popularity threshold to be added to Linguist.
I could make the PR to add the language to GitHub, but I would appreciate the input of people with more experience with the language regarding which syntax highlighting should be used between the 2 mentioned above.

Does the syntax for Algol 68 include all the syntax in Algol 60? Should they be added seperatly or as a group?

[jemarch]

Algol 68 is a very different language than Algol 60, with a different syntax.

Emacs mode with syntax highlighting: https://git.sr.ht/~jemarch/a68-mode

[DecimalTurn]

@jemarch Thanks for confirming that Algol 68 isn't backward compatible with Algol 60. I guess it might be better to add them seperatly then. However, we would need regex rules to determine if a .alg file is Algol 60 or Algol 68.

Regarding the syntax highlighting you linked, unfortunately this can't be used by github-linguist since it's not a textmate grammar like the ones I've linked in the top post.