add El LSP skeleton — language server, VSCode extension, syntax highlighting

Implements a Language Server Protocol server for El files over stdin/stdout JSON-RPC. Provides completions (builtins + keywords + document functions), hover documentation, go-to-definition, and full document sync. Also adds a VSCode extension that launches the binary as a child process and a TextMate grammar for .el syntax highlighting. NOTE: el-lsp.el calls __read_n(n: Int) -> String, a seed primitive not yet in el_runtime.c. Build.sh documents the required C implementation; the seed agent must add it before the binary will link.
2026-05-03 15:52:10 -05:00
parent 9d0e1f64d4
commit cefff5b891
6 changed files with 1245 additions and 0 deletions
@@ -0,0 +1,133 @@
+{
+  "$schema": "https://raw.githubusercontent.com/martinring/tmlanguage/master/tmlanguage.json",
+  "name": "El",
+  "scopeName": "source.el",
+  "fileTypes": ["el"],
+  "patterns": [
+    { "include": "#comments" },
+    { "include": "#strings" },
+    { "include": "#function-definition" },
+    { "include": "#keywords" },
+    { "include": "#types" },
+    { "include": "#constants" },
+    { "include": "#numbers" },
+    { "include": "#operators" },
+    { "include": "#function-call" },
+    { "include": "#identifiers" }
+  ],
+  "repository": {
+
+    "comments": {
+      "name": "comment.line.double-slash.el",
+      "match": "//.*$"
+    },
+
+    "strings": {
+      "name": "string.quoted.double.el",
+      "begin": "\"",
+      "end": "\"",
+      "patterns": [
+        {
+          "name": "constant.character.escape.el",
+          "match": "\\\\[nrt\\\\\"']"
+        }
+      ]
+    },
+
+    "function-definition": {
+      "comment": "Highlight 'fn name(' — the name gets entity.name.function scope",
+      "match": "\\bfn\\s+([a-zA-Z_][a-zA-Z0-9_]*)\\s*\\(",
+      "captures": {
+        "0": { "name": "meta.function.el" },
+        "1": { "name": "entity.name.function.el" }
+      }
+    },
+
+    "keywords": {
+      "patterns": [
+        {
+          "comment": "Control-flow keywords",
+          "name": "keyword.control.el",
+          "match": "\\b(if|else|while|for|in|return|match)\\b"
+        },
+        {
+          "comment": "Declaration keywords",
+          "name": "keyword.declaration.el",
+          "match": "\\b(fn|let|type|enum|import|from|as)\\b"
+        },
+        {
+          "comment": "Reserved future keywords",
+          "name": "keyword.other.el",
+          "match": "\\b(cgi|vessel|activate|where|sealed|with|test|seed|assert|protocol|impl|retry|times|fallback|reason|parallel|trace|requires|deploy|to|via|target|manager|engine|accessor)\\b"
+        }
+      ]
+    },
+
+    "types": {
+      "comment": "Built-in El types",
+      "name": "support.type.el",
+      "match": "\\b(String|Int|Float|Bool|Void|Any|Map|List)\\b"
+    },
+
+    "constants": {
+      "patterns": [
+        {
+          "name": "constant.language.boolean.el",
+          "match": "\\b(true|false)\\b"
+        }
+      ]
+    },
+
+    "numbers": {
+      "patterns": [
+        {
+          "name": "constant.numeric.float.el",
+          "match": "\\b[0-9]+\\.[0-9]+\\b"
+        },
+        {
+          "name": "constant.numeric.integer.el",
+          "match": "\\b[0-9]+\\b"
+        }
+      ]
+    },
+
+    "operators": {
+      "patterns": [
+        {
+          "name": "keyword.operator.comparison.el",
+          "match": "(==|!=|<=|>=|<|>)"
+        },
+        {
+          "name": "keyword.operator.logical.el",
+          "match": "(&&|\\|\\||!)"
+        },
+        {
+          "name": "keyword.operator.assignment.el",
+          "match": "(?<![=!<>])=(?!=)"
+        },
+        {
+          "name": "keyword.operator.arithmetic.el",
+          "match": "[+\\-*/%]"
+        },
+        {
+          "name": "keyword.operator.arrow.el",
+          "match": "->"
+        }
+      ]
+    },
+
+    "function-call": {
+      "comment": "Highlight function calls: name( — name gets entity.name.function scope",
+      "match": "\\b([a-zA-Z_][a-zA-Z0-9_]*)\\s*(?=\\()",
+      "captures": {
+        "1": { "name": "entity.name.function.call.el" }
+      }
+    },
+
+    "identifiers": {
+      "comment": "General identifiers — lower priority than other rules",
+      "name": "variable.other.el",
+      "match": "\\b[a-zA-Z_][a-zA-Z0-9_]*\\b"
+    }
+  }
+}