Implement dynamic ranges (#4151)

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Closes #4021

Allows array ranges (e.g., `[0..10]`) to take expression instead of just numeric literals as their start and end values. Both expressions are required (we don't support `[0..]`, etc.).

I've created a new kind of expression in the AST. The alternative was to represent the internals of an array as some kind of pattern which could initially be fully explicit or ranges. I figured the chosen version was simpler and easier to extend to open ranges, whereas the latter would be easier to extend to mixed ranges or other patterns. I chose simpler, it'll be easy enough to refactor if necessary.

Parsing is tested implicitly by the tests of execution and unparsing.

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Signed-off-by: Nick Cameron <nrc@ncameron.org>
Co-authored-by: Adam Chalmers <adam.chalmers@zoo.dev>

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Nick Cameron

2024-10-17 02:58:04 +13:00

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15 changed files with 655 additions and 284 deletions

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