70 lines
2.1 KiB
Markdown
70 lines
2.1 KiB
Markdown
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## What
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A language server for all three dialects of LIGO.
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## Design choices
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The server contains 2 big parts:
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1) Grammars
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2) Server itself.
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Grammars are in separate folders, in form of tree-sitter grammars.
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They are compiled via `tree-sitter generate` command in their respective folder.
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Then they are linked as `parser.c` file with GHC toolchain.
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Because GHCi REPL is unable to link from outside of project folder, the `parser.c` is
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symlinked into `vendor/` directory.
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Right now only one parser is linked there; the name of symlink should be changed
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in future.
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Server part invokes the TS-parser and then constructs a tree of haskell datatypes
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from the TS-tree. Then it is fed into `AST.Parser` (name will be changed), which
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constructs an universal AST from the tree of the respective language.
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Parser uses the root `Parser` module which provides the combinators and monad
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to deal with `ParseTree`, produced from TS output.
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The tree it produces has:
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1) An `ASTInfo` at each node, which contains the `Range` of that node and
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preceeding comments. Sadly, but the comments after all the code in the module
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are lost.
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2) Some structure;
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3) Ability to be just an `Error` instead of all above. An error contains `Range`
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as well.
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It is possible to update the scopes in the tree, using `updateTree` function,
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which is a specialised custom `traverse`.
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It is also possible to get the zipper-like chain of trees, covering some node,
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in ascending order - using `spineTo` function. If you have already pinned
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the scopes, you can just take first one and pull the scope out of it. Unless
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it is an `Error` node. We probably need th error nodes to be `Functor`s
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as well as any other structures used to build the tree.
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On top of all that is an event loop for handling messages from some lsp-client.
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## For developers
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To compile and run, the following tools are needed:
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1) tree-sitter-clr (the Node.js one was usied during development)
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2) optionally, nix package manager
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3) haskell-stack
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First, you need to generate the `parser.c`.
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For that, do
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```
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cd tools/lsp/pascaligo
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tree-sitter generate
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```
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Then
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```
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cd ../squirrel
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stack install
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```
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The executable is a language server. |