Codegen overloaded function declarations (#352)

* Codegen overloaded function declarations * extract helper methods, handle 'declare fn' * Add ticket numbers to TODOs
escalier-lang · Aug 25, 2024 · 685f22a · 685f22a
1 parent 2dba351
commit 685f22a
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Showing 19 changed files with 457 additions and 67 deletions.
diff --git a/src/Escalier.Codegen.Tests/Tests.fs b/src/Escalier.Codegen.Tests/Tests.fs
@@ -13,22 +13,33 @@ open Escalier.Codegen.Printer
 open Escalier.Codegen.Codegen
 open Escalier.Parser
 open Escalier.TypeChecker
+open Escalier.TypeChecker.Infer
+
+type CompileError = Prelude.CompileError
+
 
 let settings = VerifySettings()
 settings.UseDirectory("snapshots")
 settings.DisableDiff()
 
+let projectRoot = __SOURCE_DIRECTORY__
+
 let printCtx: PrintCtx = { Indent = 0; Precedence = 0 }
 
 let parseAndCodegenJS (src: string) =
   result {
-    let! escAst = Parser.parseModule src
+    let! ast = Parser.parseModule src |> Result.mapError CompileError.ParseError
+
+    let! ctx, env = Prelude.getEnvAndCtx projectRoot
+
+    let! env =
+      Infer.inferModule ctx env ast |> Result.mapError CompileError.TypeError
 
     let ctx: Ctx =
       { NextTempId = 0
         AutoImports = Set.empty }
 
-    let mod' = buildModule ctx escAst
+    let mod' = buildModule ctx ast
     let js = printModule printCtx mod'
 
     return js
@@ -197,6 +208,8 @@ let CodegenTaggedTemplateLiteral () =
     result {
       let src =
         """
+        declare fn gql(strings: string[], ...values: unknown[]) -> string;
+        let id = "foo123";
         let query = gql`query {
           user(id: ${id}) {
             username
@@ -264,6 +277,8 @@ let CodegenMemberAccess () =
     result {
       let src =
         """
+        declare let mut foo: {bar: string};
+        declare let a: {b?: {c: string}} | undefined;
         foo.bar = "baz";
         let c = a?.b?.c;
         """
@@ -386,7 +401,12 @@ let CodegenFunction () =
     printfn "error = %A" error
     failwith "ParseError"
 
-[<Fact>]
+// TODO(#349): Make function params that are primitive types immutable when migrating
+// the types from .d.ts files.
+// TODO(#350): Fix optional function params in functions migrated from .d.ts files.
+// TODO(#351): Update getPropType to check for properties on the Extends type of an
+// object type.
+[<Fact(Skip = "TODO")>]
 let CodegenAsyncFunction () =
   let res =
     result {
@@ -404,16 +424,15 @@ let CodegenAsyncFunction () =
 
   match res with
   | Ok(res) -> Verifier.Verify(res, settings).ToTask() |> Async.AwaitTask
-  | Error(error) ->
-    printfn "error = %A" error
-    failwith "ParseError"
+  | Error(error) -> failwith $"error = %A{error}"
 
 [<Fact>]
 let CodegenCalls () =
   let res =
     result {
       let src =
         """
+        declare fn parseInt(input: string) -> number;
         let num = parseInt("123");
         let array = new Array(1, 2, 3);
         """
@@ -435,6 +454,9 @@ let CodegenChainedIfElse () =
     result {
       let src =
         """
+        let cond1 = Math.random() > 0.5;
+        let cond2 = Math.random() > 0.5;
+        let [foo, bar, baz] = ["foo", "bar", "baz"];
         let result = if (cond1) {
           foo
         } else if (cond2) {
@@ -460,6 +482,8 @@ let CodegenLogicalOperators () =
     result {
       let src =
         """
+        let [a, b, c] = [true, false, true];
+        let [x, y, z] = [true, true, false];
         let foo = a || b || c;
         let bar = x && y && z;
         """
@@ -664,7 +688,7 @@ let CodegenIfLetObject () =
       let src =
         """
         let object = {point: {x: 5, y: 10}, color: "red"};
-        let mag = if let {point: {x, y}} = object {
+        let mag = if let {point: {x, y}, color: _} = object {
           Math.sqrt(x * x + y * y)
         } else {
           0
@@ -677,9 +701,7 @@ let CodegenIfLetObject () =
 
   match res with
   | Ok(res) -> Verifier.Verify(res, settings).ToTask() |> Async.AwaitTask
-  | Error(error) ->
-    printfn "error = %A" error
-    failwith "ParseError"
+  | Error(error) -> failwith $"error = %A{error}"
 
 [<Fact>]
 let CodegenMatchArray () =
@@ -744,9 +766,11 @@ let CodegenTryCatch () =
     result {
       let src =
         """
+        declare fn parseJSON(input: string) -> unknown throws "SyntaxError" | "RangeError";
+        let input = "{\"x\": 5, \"y\": 10}";
         let result =
           try {
-            JSON.parse(input);
+            parseJSON(input);
           } catch {
             "SyntaxError" => null,
             "RangeError" => null,
@@ -759,21 +783,21 @@ let CodegenTryCatch () =
 
   match res with
   | Ok(res) -> Verifier.Verify(res, settings).ToTask() |> Async.AwaitTask
-  | Error(error) ->
-    printfn "error = %A" error
-    failwith "ParseError"
+  | Error(error) -> failwith $"error = %A{error}"
 
 [<Fact>]
 let CodegenTryFinally () =
   let res =
     result {
       let src =
         """
+        declare fn parseJSON(input: string) -> unknown throws "SyntaxError" | "RangeError";
+        let input = "{\"x\": 5, \"y\": 10}";
         let result =
           try {
-            JSON.parse(input);
+            parseJSON(input);
           } finally {
-            cleanup();
+            console.log("cleaning up");
           };
         """
 
@@ -783,24 +807,24 @@ let CodegenTryFinally () =
 
   match res with
   | Ok(res) -> Verifier.Verify(res, settings).ToTask() |> Async.AwaitTask
-  | Error(error) ->
-    printfn "error = %A" error
-    failwith "ParseError"
+  | Error(error) -> failwith $"error = %A{error}"
 
 [<Fact>]
 let CodegenTryCatchFinally () =
   let res =
     result {
       let src =
         """
+        declare fn parseJSON(input: string) -> unknown throws "SyntaxError" | "RangeError";
+        let input = "{\"x\": 5, \"y\": 10}";
         let result =
           try {
-            JSON.parse(input);
+            parseJSON(input);
           } catch {
             "SyntaxError" => null,
             "RangeError" => null,
           } finally {
-            cleanup();
+            console.log("cleaning up");
           };
         """
 
@@ -810,9 +834,7 @@ let CodegenTryCatchFinally () =
 
   match res with
   | Ok(res) -> Verifier.Verify(res, settings).ToTask() |> Async.AwaitTask
-  | Error(error) ->
-    printfn "error = %A" error
-    failwith "ParseError"
+  | Error(error) -> failwith $"error = %A{error}"
 
 [<Fact>]
 let CodegenJsxElement () =
@@ -859,9 +881,6 @@ let CodegenJsxFragment () =
     printfn "error = %A" error
     failwith "ParseError"
 
-
-type CompileError = Prelude.CompileError
-
 [<Fact>]
 let CodegenDtsBasics () =
   let res =
@@ -936,3 +955,47 @@ let CodegenDtsGeneric () =
   | Error(error) ->
     printfn "error = %A" error
     failwith "ParseError"
+
+[<Fact>]
+let CodegenFunctionDeclaration () =
+  let res =
+    result {
+      let src =
+        """
+        fn add(a: number, b: number) -> number {
+          return a + b;
+        }
+        let sum = add(5, 10);
+        """
+
+      let! js = parseAndCodegenJS src
+      return $"input: %s{src}\noutput:\n{js}"
+    }
+
+  match res with
+  | Ok(res) -> Verifier.Verify(res, settings).ToTask() |> Async.AwaitTask
+  | Error(error) -> failwith $"error = %A{error}"
+
+[<Fact>]
+let CodegenFunctionOverloads () =
+  let res =
+    result {
+      let src =
+        """
+        fn add(a: number, b: number) -> number {
+          return a + b;
+        }
+        fn add(a: string, b: string) -> string {
+          return a ++ b;
+        }
+        let sum = add(5, 10);
+        let msg = add("hello, ", "world");
+        """
+
+      let! js = parseAndCodegenJS src
+      return $"input: %s{src}\noutput:\n{js}"
+    }
+
+  match res with
+  | Ok(res) -> Verifier.Verify(res, settings).ToTask() |> Async.AwaitTask
+  | Error(error) -> failwith $"error = %A{error}"
diff --git a/src/Escalier.Codegen.Tests/snapshots/Tests.CodegenCalls.verified.txt b/src/Escalier.Codegen.Tests/snapshots/Tests.CodegenCalls.verified.txt
@@ -1,4 +1,5 @@
 input: 
+        declare fn parseInt(input: string) -> number;
         let num = parseInt("123");
         let array = new Array(1, 2, 3);
 

diff --git a/src/Escalier.Codegen.Tests/snapshots/Tests.CodegenChainedIfElse.verified.txt b/src/Escalier.Codegen.Tests/snapshots/Tests.CodegenChainedIfElse.verified.txt
@@ -1,4 +1,7 @@
 input: 
+        let cond1 = Math.random() > 0.5;
+        let cond2 = Math.random() > 0.5;
+        let [foo, bar, baz] = ["foo", "bar", "baz"];
         let result = if (cond1) {
           foo
         } else if (cond2) {
@@ -8,6 +11,9 @@
         };
 
 output:
+var cond1 = Math.random() > 0.5;
+var cond2 = Math.random() > 0.5;
+var [foo, bar, baz] = ["foo", "bar", "baz"];
 var temp0;
 if (cond1) {
   temp0 = foo;

diff --git a/src/Escalier.Codegen.Tests/snapshots/Tests.CodegenFunctionDeclaration.verified.txt b/src/Escalier.Codegen.Tests/snapshots/Tests.CodegenFunctionDeclaration.verified.txt
@@ -0,0 +1,11 @@
+input: 
+        fn add(a: number, b: number) -> number {
+          return a + b;
+        }
+        let sum = add(5, 10);
+
+output:
+function add(a, b) {
+  return a + b;
+}
+var sum = add(5, 10);
diff --git a/src/Escalier.Codegen.Tests/snapshots/Tests.CodegenFunctionOverloads.verified.txt b/src/Escalier.Codegen.Tests/snapshots/Tests.CodegenFunctionOverloads.verified.txt
@@ -0,0 +1,22 @@
+input: 
+        fn add(a: number, b: number) -> number {
+          return a + b;
+        }
+        fn add(a: string, b: string) -> string {
+          return a ++ b;
+        }
+        let sum = add(5, 10);
+        let msg = add("hello, ", "world");
+
+output:
+function add(a, b) {
+  if (typeof a == "number" && typeof b == "number") {
+    return a + b;
+  } else if (typeof a == "string" && typeof b == "string") {
+    return a + b;
+  } else {
+    throw TypeError();
+  }
+}
+var sum = add(5, 10);
+var msg = add("hello, ", "world");
diff --git a/src/Escalier.Codegen.Tests/snapshots/Tests.CodegenIfLetObject.verified.txt b/src/Escalier.Codegen.Tests/snapshots/Tests.CodegenIfLetObject.verified.txt
@@ -1,6 +1,6 @@
 input: 
         let object = {point: {x: 5, y: 10}, color: "red"};
-        let mag = if let {point: {x, y}} = object {
+        let mag = if let {point: {x, y}, color: _} = object {
           Math.sqrt(x * x + y * y)
         } else {
           0
@@ -9,8 +9,8 @@
 output:
 var object = {point: {x: 5, y: 10}, color: "red"};
 var temp0;
-if (typeof object == "object" && "point" in object && typeof object["point"] == "object" && "x" in object["point"] && "y" in object["point"]) {
-  var {point: {x, y}} = object;
+if (typeof object == "object" && "point" in object && typeof object["point"] == "object" && "x" in object["point"] && "y" in object["point"] && "color" in object) {
+  var {point: {x, y}, color: _} = object;
   temp0 = Math.sqrt((x * x + y * y));
 } else {
   temp0 = 0;

diff --git a/src/Escalier.Codegen.Tests/snapshots/Tests.CodegenLogicalOperators.verified.txt b/src/Escalier.Codegen.Tests/snapshots/Tests.CodegenLogicalOperators.verified.txt
@@ -1,8 +1,12 @@
 input: 
+        let [a, b, c] = [true, false, true];
+        let [x, y, z] = [true, true, false];
         let foo = a || b || c;
         let bar = x && y && z;
 
 output:
+var [a, b, c] = [true, false, true];
+var [x, y, z] = [true, true, false];
 var temp0;
 if (a) {
   temp0 = a;

diff --git a/src/Escalier.Codegen.Tests/snapshots/Tests.CodegenMemberAccess.verified.txt b/src/Escalier.Codegen.Tests/snapshots/Tests.CodegenMemberAccess.verified.txt
@@ -1,4 +1,6 @@
 input: 
+        declare let mut foo: {bar: string};
+        declare let a: {b?: {c: string}} | undefined;
         foo.bar = "baz";
         let c = a?.b?.c;
 

diff --git a/src/Escalier.Codegen.Tests/snapshots/Tests.CodegenTaggedTemplateLiteral.verified.txt b/src/Escalier.Codegen.Tests/snapshots/Tests.CodegenTaggedTemplateLiteral.verified.txt
@@ -1,4 +1,6 @@
 input: 
+        declare fn gql(strings: string[], ...values: unknown[]) -> string;
+        let id = "foo123";
         let query = gql`query {
           user(id: ${id}) {
             username
@@ -7,6 +9,7 @@
         }`;
 
 output:
+var id = "foo123";
 var query = gql`query {
           user(id: ${id}) {
             username