This is how I've implemented string interpolation in Terrabuild last year - it's easy once you understand lexer needs to be context sensitive (kind of aha moment) - at least with FsLexYacc. Link to implementation in #fsharp, as there are few simple materials on the topic.
github.com/MagnusOpera/...

For the curious, here are the extensions written for Terrabuild in FScript.

github.com/MagnusOpera/...

Terrabuild v0.106.0 now supports brew on macOS and Linux !

github.com/MagnusOpera/...

Terra Mark DMG Mamacita's Team "Boss Blitz mode Showcase!"

#StellaSora #Gerie #Nazuna #Tilia #TerraMark #TerraTeam

youtube.com/watch?v=fDou...

#animegacha #animegame #animearpg #arpg #mobile #pc #f2p #gameplay #build #guide #tips #tutorial #bossblitz #boss #bossfight #terrabuild

fscript is a demo host to play with the language but the real thing is to embed the language in your .net app !

For example, Terrabuild has been successfully adapted to use FScript for extensions: no more .net sdk dependency and no need to compile extensions with F#. Just write a script now !

Integration in Terrabuild is mostly done for extensions! Next is to focus on extension distribution (local and http) and documentation generator. Needless to say this will be a major improvement for Terrabuild. Really happy about FScript capabilities. Hope you will like it too !

I'm planning to use FScript to replace extensions in Terrabuild: using F# scripts requires installation of .net SDK - it's a bit heavy so I need to remove this dependency. FScript will also allow execution sandboxing. In next weeks, Terrabuild will have great security and full extensibility. Nice.

Then the FsYacc grammar (Parser.fsy) can build an AST from the emitted token and construct what could have been built using format() or tostring().

github.com/MagnusOpera/...

In order to implement this feature, I had to implement a lex filter with ability to switch between 2 modes: normal and interpolation. This filter is driven by the lexer which can change mode depending on the parsed tokens (Lexer.fsl).

github.com/MagnusOpera/...

I't s been a while I wanted to implement interpolated string for Terrabuild but was always feared how to do this due to the strong relationship between parser and lexer. I've finally come to something easy to understand using rules in FsLex. Parser is available here: github.com/MagnusOpera/...

I’m using the F# compiler service (usage here github.com/MagnusOpera/...) - but my understanding is that this requires .net sdk. I’m trying to get rid of sdk to simplify deployments (no runtime, no sdk - just single file app). Maybe I’m wrong and this can be used with such scenario ?