From 686c4914b0f90e41e6251cd3f1c83394a61e4418 Mon Sep 17 00:00:00 2001
From: Techatrix <19954306+Techatrix@users.noreply.github.com>
Date: Mon, 29 Jan 2024 05:23:48 +0000
Subject: [PATCH] fix pointer unwrapping when detecting self parameters (#1730)

fixes #1729
---
 src/analysis.zig                   | 27 ++++++++++++---------------
 tests/lsp_features/inlay_hints.zig | 18 ++++++++++++++++++
 2 files changed, 30 insertions(+), 15 deletions(-)

diff --git a/src/analysis.zig b/src/analysis.zig
index cd40d1c2e..179c1b243 100644
--- a/src/analysis.zig
+++ b/src/analysis.zig
@@ -269,24 +269,21 @@ pub fn firstParamIs(
     const param = ast.nextFnParam(&it).?;
     if (param.type_expr == 0) return false;
 
-    if (try analyser.resolveTypeOfNodeInternal(.{
+    const resolved_type = try analyser.resolveTypeOfNodeInternal(.{
         .node = param.type_expr,
         .handle = handle,
-    })) |resolved_type| {
-        if (resolved_type.eql(expected))
-            return true;
-    }
+    }) orelse return false;
+    if (!resolved_type.is_type_val) return false;
 
-    if (ast.fullPtrType(tree, param.type_expr)) |ptr_type| {
-        if (try analyser.resolveTypeOfNodeInternal(.{
-            .node = ptr_type.ast.child_type,
-            .handle = handle,
-        })) |resolved_prefix_op| {
-            if (resolved_prefix_op.eql(expected))
-                return true;
-        }
-    }
-    return false;
+    const deref_type = switch (resolved_type.data) {
+        .pointer => |info| switch (info.size) {
+            .One => info.elem_ty.*,
+            .Many, .Slice, .C => return false,
+        },
+        else => resolved_type,
+    };
+
+    return deref_type.eql(expected);
 }
 
 pub fn getVariableSignature(allocator: std.mem.Allocator, tree: Ast, var_decl: Ast.full.VarDecl) error{OutOfMemory}![]const u8 {
diff --git a/tests/lsp_features/inlay_hints.zig b/tests/lsp_features/inlay_hints.zig
index b1acd897e..25545501f 100644
--- a/tests/lsp_features/inlay_hints.zig
+++ b/tests/lsp_features/inlay_hints.zig
@@ -44,6 +44,11 @@ test "inlayhints - function self parameter" {
         \\const foo: Foo = .{};
         \\const _ = foo.bar(<alpha>5);
     , .Parameter);
+    try testInlayHints(
+        \\const Foo = struct { pub fn bar(self: *Foo, alpha: u32) void {} };
+        \\const foo: *Foo = undefined;
+        \\const _ = foo.bar(<alpha>5);
+    , .Parameter);
     try testInlayHints(
         \\const Foo = struct { pub fn bar(_: Foo, alpha: u32, beta: []const u8) void {} };
         \\const foo: Foo = .{};
@@ -54,6 +59,11 @@ test "inlayhints - function self parameter" {
         \\const foo: Foo = .{};
         \\const _ = foo.bar(<alpha>5,<beta>4);
     , .Parameter);
+    try testInlayHints(
+        \\const Foo = struct { pub fn bar(self: Foo, alpha: u32, beta: anytype) void {} };
+        \\const foo: *Foo = undefined;
+        \\const _ = foo.bar(<alpha>5,<beta>4);
+    , .Parameter);
     try testInlayHints(
         \\const Foo = struct { pub fn bar(self: Foo, alpha: u32, beta: []const u8) void {} };
         \\const _ = Foo.bar(<self>undefined,<alpha>5,<beta>"");
@@ -68,6 +78,14 @@ test "inlayhints - function self parameter" {
     , .Parameter);
 }
 
+test "inlayhints - function self parameter with pointer type in type declaration" {
+    try testInlayHints(
+        \\const Foo = *opaque { pub fn bar(self: Foo, alpha: u32) void {} };
+        \\const foo: Foo = undefined;
+        \\const _ = foo.bar(<alpha>5);
+    , .Parameter);
+}
+
 test "inlayhints - resolve alias" {
     try testInlayHints(
         \\fn foo(alpha: u32) void {}