4 files changed, 206 insertions, 1 deletions

diff --git a/spec/inputs/annotation.yue b/spec/inputs/annotation.yue
new file mode 100644
index 0000000..2124ad3
--- /dev/null
+++ b/spec/inputs/annotation.yue
@@ -0,0 +1,27 @@
+macro ClsDef = (code`ClassDecl) ->
+        className = code\match "^class%s+(%w+)"
+        lines = table.concat [item\gsub "%-%-%-", "---@" for item in code\gmatch "(%-%-%-.-)\n"], "\n"
+        return
+                type: "text"
+                before: false
+                code: |
+                        ---@class #{className}
+                        #{lines}
+                        ---@class #{className}Class
+                        ---@operator call:#{className}
+                        ---@cast #{className} #{className}Class
+
+$[ClsDef]
+class A
+        ---field x number
+        ---field y number
+        new: (@x = 0, @y = 0) =>
+        ---field setAdd fun(self: A, x: number, y: number): number Set fields and add number values.
+        setAdd: (@x, @y) => @x + @y
+
+a = A!
+res = a::setAdd 1, 2
+print(a.x, a.y, a.y, res)
+
+return
+
diff --git a/spec/inputs/annotation_before.yue b/spec/inputs/annotation_before.yue
new file mode 100644
index 0000000..9b11aad
--- /dev/null
+++ b/spec/inputs/annotation_before.yue
@@ -0,0 +1,16 @@
+macro Tag = (tag, code`ClassDecl) ->
+        className = code\match "^class%s+(%w+)"
+        return
+                type: "text"
+                before: tag == "before"
+                code: "-- #{tag}:#{className}"
+
+$[Tag("before")]
+class B
+        getTag: => "before"
+
+$[Tag("after")]
+class C
+        getTag: => "after"
+
+return B!\getTag!, C!\getTag!
diff --git a/spec/inputs/test/annotation_spec.yue b/spec/inputs/test/annotation_spec.yue
new file mode 100644
index 0000000..3cd1d5a
--- /dev/null
+++ b/spec/inputs/test/annotation_spec.yue
@@ -0,0 +1,160 @@
+import to_lua from require "yue"
+
+compile_and_run = (code, config = {}) ->
+        lua_code, err = to_lua code, config
+        assert.is_nil err
+        assert.is_not_nil lua_code
+        chunk, load_err = load lua_code
+        assert.is_nil load_err
+        assert.is_not_nil chunk
+        chunk!
+
+describe "annotation", ->
+        it "should append generated text after annotated class by default", ->
+                code = [[
+macro ClsDef = (code`ClassDecl) ->
+        className = code\match "^class%s+(%w+)"
+        return
+                type: "text"
+                before: false
+                code: "-- after:" .. className
+
+$[ClsDef]
+class A
+        getName: => "A"
+
+return
+]]
+                result, err = to_lua code
+                assert.is_nil err
+                assert.is_not_nil result
+                assert.is_true result\find("__name = \"A\"") != nil
+                assert.is_true result\find("%-%- after:A") != nil
+                assert.is_true result\find("__name = \"A\"") < result\find("%-%- after:A")
+
+        it "should place generated text before the annotated statement when before is true", ->
+                code = [[
+macro Before = (code`ClassDecl) ->
+        className = code\match "^class%s+(%w+)"
+        return
+                type: "text"
+                before: true
+                code: "-- before:" .. className
+
+$[Before]
+class B
+        getName: => "B"
+
+return
+]]
+                result, err = to_lua code
+                assert.is_nil err
+                assert.is_not_nil result
+                assert.is_true result\find("%-%- before:B") != nil
+                assert.is_true result\find("local B") != nil
+                assert.is_true result\find("%-%- before:B") < result\find("local B")
+
+        it "should support annotation invocation arguments", ->
+                code = [[
+macro Tag = (tag, code`ClassDecl) ->
+        className = code\match "^class%s+(%w+)"
+        return
+                type: "text"
+                before: false
+                code: "-- " .. tag .. ":" .. className
+
+$[Tag("entity")]
+class C
+        getName: => "C"
+
+return
+]]
+                result, err = to_lua code
+                assert.is_nil err
+                assert.is_not_nil result
+                assert.is_true result\find("%-%- \"entity\":C") != nil
+
+        it "should report an error when annotation is not followed by a statement", ->
+                code = [[
+macro Invalid = (code) -> ""
+$[Invalid]
+]]
+                result, err = to_lua code
+                assert.is_nil result
+                assert.is_true err\match("annotation must be followed by a statement") != nil
+
+        it "should wrap annotated function to validate numeric arguments", ->
+                code = [[
+macro ValidateNumberArgs = (code) ->
+        funcName = code\match "^(%w+)%s*="
+        return
+                type: "text"
+                before: false
+                code: table.concat {
+                        "local __orig_#{funcName} = #{funcName}"
+                        "#{funcName} = function(a, b)"
+                        "\tassert(type(a) == \"number\", \"expected number for a\")"
+                        "\tassert(type(b) == \"number\", \"expected number for b\")"
+                        "\treturn __orig_#{funcName}(a, b)"
+                        "end"
+                }, "\n"
+
+$[ValidateNumberArgs]
+add = (a, b) -> a + b
+
+ok, value = pcall -> add 3, 4
+bad_ok, bad_err = pcall -> add "3", 4
+return ok, value, bad_ok, bad_err
+]]
+                ok, value, bad_ok, bad_err = compile_and_run code
+                assert.is_true ok
+                assert.same value, 7
+                assert.is_false bad_ok
+                assert.is_true bad_err\match("expected number for a") != nil
+
+        it "should wrap annotated function to validate return value", ->
+                code = [[
+macro ValidateNumberReturn = (code) ->
+        funcName = code\match "^(%w+)%s*="
+        return
+                type: "text"
+                before: false
+                code: table.concat {
+                        "local __orig_#{funcName} = #{funcName}"
+                        "#{funcName} = function(...)"
+                        "\tlocal result = __orig_#{funcName}(...)"
+                        "\tassert(type(result) == \"number\", \"expected numeric return\")"
+                        "\treturn result"
+                        "end"
+                }, "\n"
+
+$[ValidateNumberReturn]
+toText = (value) -> tostring value
+
+ok, err = pcall -> toText 42
+return ok, err
+]]
+                ok, err = compile_and_run code
+                assert.is_false ok
+                assert.is_true err\match("expected numeric return") != nil
+
+        it "should use annotation arguments to register annotated classes", ->
+                code = [[
+macro Register = (registry, code`ClassDecl) ->
+        className = code\match "^class%s+(%w+)"
+        return
+                type: "text"
+                before: false
+                code: "#{registry}[\"#{className}\"] = #{className}"
+
+registry = {}
+
+$[Register(registry)]
+class Worker
+        run: => "ok"
+
+return registry.Worker != nil, registry.Worker!\run!
+]]
+                exists, result = compile_and_run code
+                assert.is_true exists
+                assert.same result, "ok"
diff --git a/spec/inputs/test/format_spec.yue b/spec/inputs/test/format_spec.yue
index 310b610..a76a5dd 100644
--- a/spec/inputs/test/format_spec.yue
+++ b/spec/inputs/test/format_spec.yue
@@ -26,6 +26,8 @@ files = [
         "spec/inputs/export_default.yue"
         "spec/inputs/with_scope_shadow.yue"
         "spec/inputs/assign.yue"
+        "spec/inputs/annotation.yue"
+        "spec/inputs/annotation_before.yue"
         "spec/inputs/literals.yue"
         "spec/inputs/luarocks_upload.yue"
         "spec/inputs/comprehension_nested.yue"
@@ -64,6 +66,7 @@ files = [
         "spec/inputs/test/continue_spec.yue"
         "spec/inputs/test/varargs_assignment_spec.yue"
         "spec/inputs/test/advanced_macro_spec.yue"
+        "spec/inputs/test/annotation_spec.yue"
         "spec/inputs/test/pipe_spec.yue"
         "spec/inputs/test/export_spec.yue"
         "spec/inputs/test/existential_spec.yue"
@@ -192,4 +195,3 @@ for file in *files
         assert.is_not_nil ast
         rewriteLineCol ast
         assert.same original_ast, ast
-