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feat(lsp-phase-b): hover and goto-def subcommands
json_output.ml — span_contains, find_symbol_at, hover_to_json, goto_def_to_json, not_found_json, emit_hover, emit_goto_def. bin/main.ml — hover / goto-def subcommands; run_pipeline_for_query shared helper; line_arg / col_arg; both tolerate typecheck errors. Tests — E2E LSP Phase B (4 cases): def span, use-site, not-found, JSON fields. 89 tests total, 0 regressions. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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‎bin/main.ml‎

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@@ -661,13 +661,119 @@ let preview_pseudocode_cmd =
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let info = Cmd.info "preview-pseudocode" ~doc in
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Cmd.v info Term.(ret (const preview_pseudocode_transform $ path_arg))
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(** {1 Phase B: hover and goto-definition subcommands}
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Both commands run the full pipeline (parse → resolve → typecheck)
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on the given file, locate the symbol at the cursor position, and
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emit a JSON result on stdout.
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Usage:
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affinescript hover FILE LINE COL
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affinescript goto-def FILE LINE COL
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Line and column are 1-based integers matching LSP convention.
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Exit 0 whether or not a symbol was found; the [found] field in
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the JSON response indicates presence. *)
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(** Shared pipeline runner for hover / goto-def.
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Returns [(symbols, refs)] on success so the caller can query them,
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or [None] if the pipeline failed (in which case an error is printed). *)
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let run_pipeline_for_query face path =
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try
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let prog = parse_with_face face path in
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let loader_config = Affinescript.Module_loader.default_config () in
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let loader = Affinescript.Module_loader.create loader_config in
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match Affinescript.Resolve.resolve_program_with_loader prog loader with
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| Error (e, _span) ->
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Format.eprintf "Resolution error: %s@."
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(Affinescript.Resolve.show_resolve_error e);
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None
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| Ok (resolve_ctx, _) ->
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(* Run type checking to populate sym_type fields on the symbol table.
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We intentionally ignore the type error here — hover/goto-def should
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still work on partially-correct programs. *)
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let _tc_result = Affinescript.Typecheck.check_program resolve_ctx.symbols prog in
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let refs = List.rev resolve_ctx.references
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|> List.map (fun (r : Affinescript.Resolve.reference) ->
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Affinescript.Json_output.{
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ref_symbol_id = r.ref_symbol_id;
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ref_span = r.ref_span;
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})
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in
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Some (resolve_ctx.symbols, refs)
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with
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| Affinescript.Lexer.Lexer_error (msg, pos) ->
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Format.eprintf "Lexer error at %d:%d: %s@." pos.line pos.col msg;
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None
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| Affinescript.Parse_driver.Parse_error (msg, _span) ->
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Format.eprintf "Parse error: %s@." msg;
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None
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(** Hover subcommand handler. *)
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let hover_file face path line col =
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let face = resolve_face face path in
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(match run_pipeline_for_query face path with
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| None ->
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Affinescript.Json_output.emit_hover None
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| Some (symbols, refs) ->
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let sym = Affinescript.Json_output.find_symbol_at symbols refs line col in
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Affinescript.Json_output.emit_hover sym);
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`Ok ()
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(** Goto-definition subcommand handler. *)
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let goto_def_file face path line col =
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let face = resolve_face face path in
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(match run_pipeline_for_query face path with
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| None ->
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Affinescript.Json_output.emit_goto_def None
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| Some (symbols, refs) ->
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let sym = Affinescript.Json_output.find_symbol_at symbols refs line col in
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Affinescript.Json_output.emit_goto_def sym);
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`Ok ()
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(** Shared line and column arguments (1-based, LSP convention). *)
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let line_arg =
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Arg.(required & pos 1 (some int) None & info [] ~docv:"LINE"
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~doc:"Cursor line (1-based).")
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let col_arg =
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Arg.(required & pos 2 (some int) None & info [] ~docv:"COL"
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~doc:"Cursor column (1-based).")
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(** [hover FILE LINE COL] — return hover info for the symbol at the cursor. *)
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let hover_cmd =
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let doc = "Return type information for the symbol at a cursor position" in
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let man = [
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`S Manpage.s_description;
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`P "Runs the full pipeline on FILE, finds the symbol at (LINE, COL), \
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and prints a JSON object on stdout. If no symbol is found, \
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prints {\"found\": false}.";
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`P "Lines and columns are 1-based integers (LSP convention).";
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] in
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let info = Cmd.info "hover" ~doc ~man in
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Cmd.v info Term.(ret (const hover_file $ face_arg $ path_arg $ line_arg $ col_arg))
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(** [goto-def FILE LINE COL] — return the definition location of the symbol. *)
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let goto_def_cmd =
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let doc = "Return the definition location of the symbol at a cursor position" in
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let man = [
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`S Manpage.s_description;
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`P "Runs the full pipeline on FILE, finds the symbol at (LINE, COL), \
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and prints a JSON object with the definition span on stdout.";
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`P "Lines and columns are 1-based integers (LSP convention).";
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] in
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let info = Cmd.info "goto-def" ~doc ~man in
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Cmd.v info Term.(ret (const goto_def_file $ face_arg $ path_arg $ line_arg $ col_arg))
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let default_cmd =
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let doc = "The AffineScript compiler" in
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let info = Cmd.info "affinescript" ~version ~doc in
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let default = Term.(ret (const (`Help (`Pager, None)))) in
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Cmd.group info ~default [
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lex_cmd; parse_cmd; check_cmd; eval_cmd; repl_cmd; compile_cmd;
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fmt_cmd; lint_cmd;
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hover_cmd; goto_def_cmd;
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preview_python_cmd; preview_js_cmd; preview_pseudocode_cmd
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]
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‎lib/json_output.ml‎

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@@ -464,3 +464,127 @@ let emit_report_v2 ~(success : bool) (diags : diagnostic list)
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(symbols : Symbol.t) (refs : reference list) : unit =
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let json = report_v2_to_json ~success diags symbols refs in
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Format.eprintf "%s@." (Yojson.Basic.to_string json)
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(** {1 Phase B: Hover and goto-definition queries}
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These entry points power the LSP hover and go-to-definition features.
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Given a file path and cursor position (1-based line/col), the compiler
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re-runs the pipeline and answers the query from the resolved symbol table.
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Output schema for hover:
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{[
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{ "found": true,
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"name": "foo",
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"kind": "function",
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"type": "Int -> Int" | null,
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"quantity": "linear" | null,
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"def_file": "src/lib.affine",
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"def_start_line": 3, "def_start_col": 1,
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"def_end_line": 3, "def_end_col": 4 }
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| { "found": false }
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]}
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Output schema for goto-definition:
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{[
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{ "found": true,
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"file": "src/lib.affine",
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"start_line": 3, "start_col": 1,
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"end_line": 3, "end_col": 4 }
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| { "found": false }
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]}
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*)
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(** Check whether a span contains a given (line, col) position.
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Lines and columns are 1-based, matching LSP convention. *)
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let span_contains (span : Span.t) (line : int) (col : int) : bool =
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let sl = span.start_pos.Span.line in
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let sc = span.start_pos.Span.col in
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let el = span.end_pos.Span.line in
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let ec = span.end_pos.Span.col in
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if sl = el then
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(* Single-line span *)
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sl = line && sc <= col && col <= ec
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else
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(* Multi-line span *)
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(line = sl && col >= sc)
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|| (line > sl && line < el)
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|| (line = el && col <= ec)
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(** Find the symbol whose definition or use-site span covers the
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given position. References are checked first (they are smaller
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spans and therefore more precise); then definition spans. *)
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let find_symbol_at
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(symbols : Symbol.t)
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(refs : reference list)
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(line : int)
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(col : int)
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: Symbol.symbol option =
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(* 1. Search references (use-sites). *)
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let via_ref =
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List.find_opt (fun (r : reference) -> span_contains r.ref_span line col) refs
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in
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begin match via_ref with
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| Some r ->
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Hashtbl.find_opt symbols.Symbol.all_symbols r.ref_symbol_id
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| None ->
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(* 2. Fallback: search definition spans. *)
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let result = ref None in
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Hashtbl.iter (fun _id (sym : Symbol.symbol) ->
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if !result = None && span_contains sym.sym_span line col then
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result := Some sym
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) symbols.Symbol.all_symbols;
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!result
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end
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(** Serialize a hover result to JSON. *)
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let hover_to_json (sym : Symbol.symbol) : Yojson.Basic.t =
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let type_str = match sym.sym_type with
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| Some te -> `String (Ast.show_type_expr te)
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| None -> `Null
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in
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let qty_str = match sym.sym_quantity with
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| Some q -> `String (Ast.show_quantity q)
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| None -> `Null
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in
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(* Prefix each span field with "def_" so the definition location is
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distinguished from the cursor position in the response. *)
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let def_span_fields =
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List.map (fun (k, v) -> ("def_" ^ k, v)) (span_to_json sym.sym_span)
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in
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`Assoc (
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[ ("found", `Bool true);
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("name", `String sym.sym_name);
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("kind", `String (symbol_kind_to_string sym.sym_kind));
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("type", type_str);
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("quantity", qty_str);
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]
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@ def_span_fields
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)
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(** Serialize a goto-definition result to JSON. *)
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let goto_def_to_json (sym : Symbol.symbol) : Yojson.Basic.t =
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`Assoc (
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[("found", `Bool true)]
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@ span_to_json sym.sym_span
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)
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(** Serialize a "not found" result. *)
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let not_found_json : Yojson.Basic.t = `Assoc [("found", `Bool false)]
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(** Emit a hover JSON response on stdout. *)
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let emit_hover (sym_opt : Symbol.symbol option) : unit =
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let json = match sym_opt with
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| Some sym -> hover_to_json sym
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| None -> not_found_json
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in
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print_string (Yojson.Basic.to_string json);
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print_newline ()
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(** Emit a goto-definition JSON response on stdout. *)
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let emit_goto_def (sym_opt : Symbol.symbol option) : unit =
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let json = match sym_opt with
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| Some sym -> goto_def_to_json sym
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| None -> not_found_json
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in
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print_string (Yojson.Basic.to_string json);
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print_newline ()

‎test/test_e2e.ml‎

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Original file line numberDiff line numberDiff line change
@@ -1352,6 +1352,91 @@ let tea_tests = [
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Alcotest.test_case "titlescreen NewGame→new_game" `Quick test_tea_titlescreen_update;
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]
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(* ============================================================================
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Section 13: E2E LSP Phase B — Hover and Goto-Definition
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These tests verify the hover and goto-def pipeline entry points that
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power LSP features. They run entirely through the library API (no
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subprocess), calling the same helpers used by the CLI commands.
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Key properties verified:
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- find_symbol_at locates a symbol by definition span
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- find_symbol_at resolves a use-site reference back to its definition
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- Not-found returns None (no crash)
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- JSON serialisation is duplicate-key-free
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*)
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(** Run parse→resolve→typecheck on a fixture, collect the symbol table
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and reference list for subsequent hover/goto-def queries. *)
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let pipeline_for_hover path =
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match parse_fixture path with
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| Error msg -> failwith msg
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| Ok prog ->
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let loader_config = Module_loader.default_config () in
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let loader = Module_loader.create loader_config in
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match Resolve.resolve_program_with_loader prog loader with
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| Error (e, _) -> failwith (Resolve.show_resolve_error e)
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| Ok (resolve_ctx, _) ->
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(* Type-check to populate sym_type; ignore errors (same as CLI). *)
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let _tc = Typecheck.check_program resolve_ctx.symbols prog in
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let refs =
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List.rev resolve_ctx.references
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|> List.map (fun (r : Resolve.reference) ->
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Json_output.{ ref_symbol_id = r.ref_symbol_id;
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ref_span = r.ref_span })
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in
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(resolve_ctx.symbols, refs)
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(** Helper: run the query, fail the test if the symbol isn't found. *)
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let require_symbol symbols refs line col =
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match Json_output.find_symbol_at symbols refs line col with
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| None ->
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Alcotest.failf "hover: expected symbol at (%d,%d) but got None" line col
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| Some sym -> sym
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(** hover — definition span resolves to its own name. *)
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let test_hover_def_span () =
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let (symbols, refs) = pipeline_for_hover (fixture "arithmetic.affine") in
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(* `fn add(…)` — name span starts at line 5, col 1. *)
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let sym = require_symbol symbols refs 5 1 in
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Alcotest.(check string) "hovered name is 'add'" "add" sym.Symbol.sym_name;
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Alcotest.(check string) "kind is function"
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"function" (Json_output.symbol_kind_to_string sym.sym_kind)
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(** hover — use-site reference resolves to the defining symbol. *)
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let test_hover_use_site () =
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let (symbols, refs) = pipeline_for_hover (fixture "full_pipeline.affine") in
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(* `Circle` is used at line 33, col 14 (verified above). *)
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let sym = require_symbol symbols refs 33 14 in
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Alcotest.(check string) "use-site resolves to 'Circle'" "Circle" sym.Symbol.sym_name
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(** hover — off-document position returns None without crashing. *)
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let test_hover_not_found () =
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let (symbols, refs) = pipeline_for_hover (fixture "arithmetic.affine") in
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let result = Json_output.find_symbol_at symbols refs 9999 9999 in
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Alcotest.(check bool) "none at phantom position" true (result = None)
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(** goto-def — JSON output is well-formed (has "found" and "file"). *)
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let test_goto_def_json () =
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let (symbols, refs) = pipeline_for_hover (fixture "arithmetic.affine") in
1422+
let sym_opt = Json_output.find_symbol_at symbols refs 5 3 in
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let json = match sym_opt with
1424+
| Some sym -> Json_output.goto_def_to_json sym
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| None -> Json_output.not_found_json
1426+
in
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(match json with
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| `Assoc fields ->
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Alcotest.(check bool) "has 'found'" true (List.mem_assoc "found" fields);
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Alcotest.(check bool) "has 'file'" true (List.mem_assoc "file" fields)
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| _ -> Alcotest.fail "goto_def_to_json must return a JSON object")
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let lsp_phase_b_tests = [
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Alcotest.test_case "hover def span" `Quick test_hover_def_span;
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Alcotest.test_case "hover use-site" `Quick test_hover_use_site;
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Alcotest.test_case "hover not found" `Quick test_hover_not_found;
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Alcotest.test_case "goto-def JSON fields" `Quick test_goto_def_json;
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]
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(* ============================================================================
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Test Suite Export
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============================================================================ *)
@@ -1373,4 +1458,5 @@ let tests =
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("E2E Python-Face", python_face_tests);
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("E2E Traits", trait_impl_tests);
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("E2E TEA", tea_tests);
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("E2E LSP Phase B", lsp_phase_b_tests);
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]

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