start env impl

Author: APConduct

.DS_Store

@@ -13,7 +13,7 @@ version = "1.0.0"
 # https://gleam.run/writing-gleam/gleam-toml/.
 
 [dependencies]
-gleam_stdlib = ">= 0.44.0 and < 2.0.0"
+gleam_stdlib = ">= 0.59.0 and < 1.0.0"
 
 [dev-dependencies]
 gleeunit = ">= 1.0.0 and < 2.0.0"

gleam.toml

@@ -7,5 +7,5 @@ packages = [
 ]
 
 [requirements]
-gleam_stdlib = { version = ">= 0.44.0 and < 2.0.0" }
+gleam_stdlib = { version = ">= 0.59.0 and < 1.0.0" }
 gleeunit = { version = ">= 1.0.0 and < 2.0.0" }

manifest.toml

@@ -0,0 +1,23 @@
+import ast.{type Expr}
+import gleam/dict
+
+pub type Env =
+  dict.Dict(String, Expr)
+
+/// Create a new empty environment
+pub fn new() -> Env {
+  dict.new()
+}
+
+/// Get a value from the environment
+pub fn get(env: Env, key: String) -> Result(Expr, String) {
+  case dict.get(env, key) {
+    Ok(value) -> Ok(value)
+    Error(_) -> Error("Unknown variable: " <> key)
+  }
+}
+
+/// Set a value in the environment
+pub fn set(env: Env, key: String, value: Expr) -> Env {
+  dict.insert(env, key, value)
+}

src/env.gleam

@@ -1 +1,3 @@
-
+import ast.{type Expr, Atom, Builtin, List, Number}
+import env.{type Env}
+import gleam/list