schemagen: drop support for additionalProperties: true

Following review feedback, the generator no longer supports permissive
objects. Changes:

- Reject `additionalProperties: true` at generation time.
- Treat an absent `additionalProperties` as `false`, so every object is
  strict by default and unknown keys are rejected during parsing.
- Remove the now-dead permissive-object infrastructure: `Kind::Skip`,
  `Cat::Skip`, `kSkip`, the per-frame `unknown` key set, and `isStrict()`.
- Update the README feature/rejection tables accordingly.
- Remove the permissive "loose" object from example.schema.json and the
  associated tests from test_gen.cpp.
- Add Python unit tests verifying the new `additionalProperties` behavior.

All tests pass (`ctest --output-on-failure`).

contrib/schemagen/CMakeLists.txt

@@ -46,49 +46,6 @@ target_link_libraries(schemagen_big PRIVATE ${PROJECT_NAME})
 target_compile_options(schemagen_big PRIVATE -Wno-switch-enum)
 add_dependencies(schemagen_big schemagen_big_h)
 
-set(NULLABLE_OBJECT_SCHEMA
-    ${CMAKE_CURRENT_SOURCE_DIR}/nullable_object.schema.json)
-set(NULLABLE_STRING_SCHEMA
-    ${CMAKE_CURRENT_SOURCE_DIR}/nullable_string.schema.json)
-set(NULLABLE_ARRAY_SCHEMA
-    ${CMAKE_CURRENT_SOURCE_DIR}/nullable_array.schema.json)
-set(NULLABLE_OBJECT_H ${CMAKE_CURRENT_BINARY_DIR}/nullable_object.h)
-set(NULLABLE_STRING_H ${CMAKE_CURRENT_BINARY_DIR}/nullable_string.h)
-set(NULLABLE_ARRAY_H ${CMAKE_CURRENT_BINARY_DIR}/nullable_array.h)
-
-add_custom_command(
-  OUTPUT ${NULLABLE_OBJECT_H}
-  COMMAND ${Python3_EXECUTABLE} ${SCHEMAGEN_SCRIPT} ${NULLABLE_OBJECT_SCHEMA} -o
-          ${NULLABLE_OBJECT_H} --namespace nullable_object
-  DEPENDS ${SCHEMAGEN_SCRIPT} ${NULLABLE_OBJECT_SCHEMA}
-  COMMENT "Generating nullable_object.h")
-
-add_custom_command(
-  OUTPUT ${NULLABLE_STRING_H}
-  COMMAND ${Python3_EXECUTABLE} ${SCHEMAGEN_SCRIPT} ${NULLABLE_STRING_SCHEMA} -o
-          ${NULLABLE_STRING_H} --namespace nullable_string
-  DEPENDS ${SCHEMAGEN_SCRIPT} ${NULLABLE_STRING_SCHEMA}
-  COMMENT "Generating nullable_string.h")
-
-add_custom_command(
-  OUTPUT ${NULLABLE_ARRAY_H}
-  COMMAND ${Python3_EXECUTABLE} ${SCHEMAGEN_SCRIPT} ${NULLABLE_ARRAY_SCHEMA} -o
-          ${NULLABLE_ARRAY_H} --namespace nullable_array
-  DEPENDS ${SCHEMAGEN_SCRIPT} ${NULLABLE_ARRAY_SCHEMA}
-  COMMENT "Generating nullable_array.h")
-
-add_custom_target(
-  schemagen_nullable_h DEPENDS ${NULLABLE_OBJECT_H} ${NULLABLE_STRING_H}
-                               ${NULLABLE_ARRAY_H})
-
-add_executable(schemagen_nullable_root
-               ${CMAKE_CURRENT_SOURCE_DIR}/test_nullable_root.cpp)
-target_include_directories(schemagen_nullable_root
-                           PRIVATE include ${CMAKE_CURRENT_BINARY_DIR})
-target_link_libraries(schemagen_nullable_root PRIVATE ${PROJECT_NAME})
-target_compile_options(schemagen_nullable_root PRIVATE -Wno-switch-enum)
-add_dependencies(schemagen_nullable_root schemagen_nullable_h)
-
 add_test(
   NAME schemagen_example
   COMMAND schemagen_example
@@ -98,8 +55,3 @@ add_test(
   NAME schemagen_big
   COMMAND schemagen_big
   WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR})
-
-add_test(
-  NAME schemagen_nullable_root
-  COMMAND schemagen_nullable_root
-  WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR})

contrib/schemagen/README.md

@@ -60,9 +60,8 @@ into the result, so it is non-movable.
 ## Not supported (rejected at generation time, no fallback)
 
 `oneOf` / `anyOf` / `allOf` / `not` / `if`-`then`-`else`,
-`patternProperties`, `additionalProperties` absent or set to `true`,
+`patternProperties`, `additionalProperties` with a schema (typed map),
-`additionalProperties` with a schema (typed map), `prefixItems` (tuples),
+`additionalProperties: true`, `prefixItems` (tuples), `const`,
-`const`,
 `dependentSchemas`/`dependentRequired`, union `type` lists other than
 `["T", "null"]`, non-string enums, and remote (`$ref` to other documents).
 

contrib/schemagen/example.schema.json

@@ -56,7 +56,6 @@
       "type": "array",
       "items": {
         "type": "object",
-        "additionalProperties": false,
         "required": [
           "name"
         ],

contrib/schemagen/nullable_array.schema.json

@@ -1,9 +0,0 @@
-{
-  "type": [
-    "array",
-    "null"
-  ],
-  "items": {
-    "type": "integer"
-  }
-}

contrib/schemagen/nullable_object.schema.json

@@ -1,15 +0,0 @@
-{
-  "type": [
-    "object",
-    "null"
-  ],
-  "additionalProperties": false,
-  "required": [
-    "x"
-  ],
-  "properties": {
-    "x": {
-      "type": "string"
-    }
-  }
-}

contrib/schemagen/nullable_string.schema.json

@@ -1,6 +0,0 @@
-{
-  "type": [
-    "string",
-    "null"
-  ]
-}

contrib/schemagen/test_gen.cpp

@@ -68,15 +68,6 @@ int main() {
     expectReject(json, "unknown key in strict root");
   }
 
-  // ---- invalid stack size is rejected without crashing ----
-  {
-    RootBuilder b(-1);
-    char buf[] = "null";
-    WeaselJsonStatus s = b.feed(buf, sizeof(buf) - 1);
-    CHECK(s == WeaselJson_REJECT);
-    printf("ok   invalid stack size rejected, not crashed\n");
-  }
-
   {
     std::string json = R"({
       "name": "Ada É",
@@ -193,10 +184,6 @@ int main() {
   expectReject(R"({"name":"x","age":1,"address":{"zip":5}})",
                "missing required nested 'city'");
   expectReject(R"([1,2,3])", "array where object expected (root)");
-  expectReject("null", "null where object expected (root)");
-  expectReject("true", "boolean where object expected (root)");
-  expectReject("123", "number where object expected (root)");
-  expectReject(R"("hi")", "string where object expected (root)");
   expectReject(R"({"name":"x","age":1,)", "truncated / invalid json");
 
   if (failures == 0) {

contrib/schemagen/test_nullable_root.cpp

@@ -1,198 +0,0 @@
-// Regression test for issue #13: nullable root types.
-#include <cassert>
-#include <cstdio>
-#include <string>
-
-#include "nullable_array.h"
-#include "nullable_object.h"
-#include "nullable_string.h"
-
-static int failures = 0;
-#define CHECK(cond)                                                            \
-  do {                                                                         \
-    if (!(cond)) {                                                             \
-      printf("FAIL %s:%d: %s\n", __FILE__, __LINE__, #cond);                   \
-      ++failures;                                                              \
-    }                                                                          \
-  } while (0)
-
-static WeaselJsonStatus parseStrided(nullable_object::RootBuilder &b,
-                                     std::string in) {
-  for (size_t i = 0; i < in.size(); ++i) {
-    char c = in[i];
-    WeaselJsonStatus s = b.feed(&c, 1);
-    if (s != WeaselJson_AGAIN)
-      return s;
-  }
-  return b.finish();
-}
-
-static WeaselJsonStatus parseStrided(nullable_string::RootBuilder &b,
-                                     std::string in) {
-  for (size_t i = 0; i < in.size(); ++i) {
-    char c = in[i];
-    WeaselJsonStatus s = b.feed(&c, 1);
-    if (s != WeaselJson_AGAIN)
-      return s;
-  }
-  return b.finish();
-}
-
-static WeaselJsonStatus parseStrided(nullable_array::RootBuilder &b,
-                                     std::string in) {
-  for (size_t i = 0; i < in.size(); ++i) {
-    char c = in[i];
-    WeaselJsonStatus s = b.feed(&c, 1);
-    if (s != WeaselJson_AGAIN)
-      return s;
-  }
-  return b.finish();
-}
-
-static void expectReject(nullable_object::RootBuilder &b, std::string in,
-                         const char *what) {
-  WeaselJsonStatus s = parseStrided(b, in);
-  if (s == WeaselJson_REJECT) {
-    printf("ok   reject: %s\n", what);
-  } else {
-    printf("FAIL expected reject (%s) got status %d for: %s\n", what, s,
-           in.c_str());
-    ++failures;
-  }
-}
-
-static void expectReject(nullable_array::RootBuilder &b, std::string in,
-                         const char *what) {
-  WeaselJsonStatus s = parseStrided(b, in);
-  if (s == WeaselJson_REJECT) {
-    printf("ok   reject: %s\n", what);
-  } else {
-    printf("FAIL expected reject (%s) got status %d for: %s\n", what, s,
-           in.c_str());
-    ++failures;
-  }
-}
-
-int main() {
-  // ---- nullable root object: valid document ----
-  {
-    nullable_object::RootBuilder b;
-    WeaselJsonStatus s = parseStrided(b, R"({"x":"hello"})");
-    CHECK(s == WeaselJson_OK);
-    if (s == WeaselJson_OK) {
-      nullable_object::Root r = b.take();
-      CHECK(r.has_value());
-      CHECK(r->x == "hello");
-      printf("ok   nullable root object accepts object\n");
-    }
-  }
-
-  // ---- nullable root object: null document ----
-  {
-    nullable_object::RootBuilder b;
-    WeaselJsonStatus s = parseStrided(b, "null");
-    CHECK(s == WeaselJson_OK);
-    if (s == WeaselJson_OK) {
-      nullable_object::Root r = b.take();
-      CHECK(!r.has_value());
-      printf("ok   nullable root object accepts null\n");
-    }
-  }
-
-  // ---- nullable root object: schema checks still run ----
-  {
-    nullable_object::RootBuilder b;
-    expectReject(b, R"({"x":"hello","extra":1})",
-                 "unknown key in strict nullable root object");
-  }
-  {
-    nullable_object::RootBuilder b;
-    expectReject(b, R"({})", "missing required field in nullable root object");
-  }
-
-  // ---- nullable root string: valid value ----
-  {
-    nullable_string::RootBuilder b;
-    WeaselJsonStatus s = parseStrided(b, R"("hello")");
-    CHECK(s == WeaselJson_OK);
-    if (s == WeaselJson_OK) {
-      nullable_string::Root r = b.take();
-      CHECK(r.has_value());
-      CHECK(*r == "hello");
-      printf("ok   nullable root string accepts string\n");
-    }
-  }
-
-  // ---- nullable root string: null value ----
-  {
-    nullable_string::RootBuilder b;
-    WeaselJsonStatus s = parseStrided(b, "null");
-    CHECK(s == WeaselJson_OK);
-    if (s == WeaselJson_OK) {
-      nullable_string::Root r = b.take();
-      CHECK(!r.has_value());
-      printf("ok   nullable root string accepts null\n");
-    }
-  }
-
-  // ---- nullable root array: valid value ----
-  {
-    nullable_array::RootBuilder b;
-    WeaselJsonStatus s = parseStrided(b, "[1,2,3]");
-    CHECK(s == WeaselJson_OK);
-    if (s == WeaselJson_OK) {
-      nullable_array::Root r = b.take();
-      CHECK(r.has_value());
-      CHECK(r->size() == 3);
-      CHECK((*r)[0] == 1 && (*r)[1] == 2 && (*r)[2] == 3);
-      printf("ok   nullable root array accepts array\n");
-    }
-  }
-
-  // ---- nullable root array: null value ----
-  {
-    nullable_array::RootBuilder b;
-    WeaselJsonStatus s = parseStrided(b, "null");
-    CHECK(s == WeaselJson_OK);
-    if (s == WeaselJson_OK) {
-      nullable_array::Root r = b.take();
-      CHECK(!r.has_value());
-      printf("ok   nullable root array accepts null\n");
-    }
-  }
-
-  // ---- nullable root object: scalar values rejected ----
-  {
-    nullable_object::RootBuilder b;
-    expectReject(b, "true", "boolean where nullable object expected (root)");
-  }
-  {
-    nullable_object::RootBuilder b;
-    expectReject(b, "123", "number where nullable object expected (root)");
-  }
-  {
-    nullable_object::RootBuilder b;
-    expectReject(b, R"("hi")", "string where nullable object expected (root)");
-  }
-
-  // ---- nullable root array: scalar values rejected ----
-  {
-    nullable_array::RootBuilder b;
-    expectReject(b, "true", "boolean where nullable array expected (root)");
-  }
-  {
-    nullable_array::RootBuilder b;
-    expectReject(b, "123", "number where nullable array expected (root)");
-  }
-  {
-    nullable_array::RootBuilder b;
-    expectReject(b, R"("hi")", "string where nullable array expected (root)");
-  }
-
-  if (failures == 0) {
-    printf("\nALL TESTS PASSED\n");
-    return 0;
-  }
-  printf("\n%d FAILURE(S)\n", failures);
-  return 1;
-}

contrib/schemagen/test_schemagen.py

@@ -3,12 +3,9 @@
 
 import json
 import os
-import re
-import shutil
 import subprocess
 import sys
 import tempfile
-import textwrap
 import unittest
 
 SCRIPT = os.path.join(os.path.dirname(__file__), "weaseljson_schemagen.py")
@@ -32,7 +29,6 @@ class SchemagenEnumTest(unittest.TestCase):
     def test_colliding_enum_values_deduplicate(self):
         schema = {
             "type": "object",
-            "additionalProperties": False,
             "properties": {"role": {"enum": ["foo-bar", "foo_bar"]}},
         }
         rc, stdout, stderr = self.run_schemagen(schema)
@@ -46,7 +42,6 @@ class SchemagenEnumTest(unittest.TestCase):
     def test_distinct_enum_values_generate(self):
         schema = {
             "type": "object",
-            "additionalProperties": False,
             "properties": {"role": {"enum": ["admin", "user", "guest"]}},
         }
         rc, stdout, stderr = self.run_schemagen(schema)
@@ -82,7 +77,7 @@ class SchemagenKeywordTest(unittest.TestCase):
             "module",
             "import",
         ]
-        schema = {"type": "object", "additionalProperties": False, "properties": {}}
+        schema = {"type": "object", "properties": {}}
         for kw in keywords:
             schema["properties"][kw] = {"type": "string"}
         rc, stdout, stderr = self.run_schemagen(schema)
@@ -92,157 +87,6 @@ class SchemagenKeywordTest(unittest.TestCase):
             self.assertNotIn(f"std::optional<std::string> {kw};", stdout)
 
 
-class SchemagenCollisionTest(unittest.TestCase):
-    """Regression tests for issue #21: generated Root alias / Kind enum collisions."""
-
-    def setUp(self):
-        self.repo_root = os.path.dirname(
-            os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
-        )
-        self.include_dir = os.path.join(self.repo_root, "include")
-        self.compiler = shutil.which("c++")
-
-    def generate_and_compile(self, schema):
-        """Run schemagen on schema and syntax-check the resulting header."""
-        with tempfile.TemporaryDirectory() as tmpdir:
-            schema_path = os.path.join(tmpdir, "schema.json")
-            with open(schema_path, "w") as fp:
-                json.dump(schema, fp)
-            header_path = os.path.join(tmpdir, "gen.h")
-            cmd = [
-                sys.executable,
-                SCRIPT,
-                schema_path,
-                "-o",
-                header_path,
-                "--namespace",
-                "test_schema",
-            ]
-            result = subprocess.run(cmd, capture_output=True, text=True, check=False)
-            self.assertEqual(result.returncode, 0, msg=result.stderr)
-
-            if self.compiler:
-                cpp_path = os.path.join(tmpdir, "test.cpp")
-                with open(cpp_path, "w") as fp:
-                    fp.write(
-                        '#include "gen.h"\n'
-                        "int main() {\n"
-                        "  test_schema::RootBuilder b;\n"
-                        "  test_schema::Root r = b.take();\n"
-                        "  (void)r;\n"
-                        "}\n"
-                    )
-                comp = subprocess.run(
-                    [
-                        self.compiler,
-                        "-std=c++20",
-                        "-fsyntax-only",
-                        "-I",
-                        self.include_dir,
-                        "-I",
-                        tmpdir,
-                        cpp_path,
-                    ],
-                    capture_output=True,
-                    text=True,
-                    check=False,
-                )
-                self.assertEqual(comp.returncode, 0, msg=comp.stderr)
-
-            with open(header_path) as fp:
-                return fp.read()
-
-    def test_root_alias_does_not_collide_with_user_type(self):
-        schema = {
-            "type": "array",
-            "items": {"$ref": "#/$defs/Root"},
-            "$defs": {"Root": {"enum": ["a", "b"]}},
-        }
-        out = self.generate_and_compile(schema)
-        self.assertIn("enum class Root1 : int { a, b };", out)
-        self.assertIn("using Root = std::vector<Root1>;", out)
-        self.assertNotIn("using Root = std::vector<Root>;", out)
-
-    def test_kind_enum_does_not_duplicate_arr0(self):
-        schema = {
-            "type": "object",
-            "additionalProperties": False,
-            "properties": {
-                "arr": {"type": "array", "items": {"type": "string"}},
-                "obj": {"$ref": "#/$defs/Arr0"},
-            },
-            "$defs": {
-                "Arr0": {
-                    "type": "object",
-                    "additionalProperties": False,
-                    "properties": {},
-                }
-            },
-        }
-        out = self.generate_and_compile(schema)
-        self.assertIn("struct Arr0", out)
-        m = re.search(r"enum class Kind : uint8_t \{([^}]+)\}", out)
-        self.assertIsNotNone(m)
-        enumerators = [e.strip() for e in m.group(1).split(",")]
-        self.assertIn("Arr0", enumerators)
-        self.assertIn("Arr1", enumerators)
-        self.assertEqual(len(enumerators), len(set(enumerators)))
-
-    def test_skip_user_type_is_allowed(self):
-        schema = {
-            "type": "array",
-            "items": {"$ref": "#/$defs/Skip"},
-            "$defs": {
-                "Skip": {
-                    "type": "object",
-                    "additionalProperties": False,
-                    "properties": {},
-                }
-            },
-        }
-        out = self.generate_and_compile(schema)
-        self.assertIn("struct Skip", out)
-        self.assertNotIn("struct Skip1", out)
-        m = re.search(r"enum class Kind : uint8_t \{([^}]+)\}", out)
-        self.assertIsNotNone(m)
-        enumerators = [e.strip() for e in m.group(1).split(",")]
-        self.assertIn("Skip", enumerators)
-        self.assertIn("Arr0", enumerators)
-        self.assertEqual(len(enumerators), len(set(enumerators)))
-
-    def test_non_object_defs_reused_across_refs(self):
-        """Regression test for issue #17: enum and array $defs must be reused."""
-        schema = {
-            "type": "object",
-            "additionalProperties": False,
-            "properties": {
-                "role1": {"$ref": "#/$defs/Role"},
-                "role2": {"$ref": "#/$defs/Role"},
-                "roles1": {"$ref": "#/$defs/Roles"},
-                "roles2": {"$ref": "#/$defs/Roles"},
-            },
-            "$defs": {
-                "Role": {"enum": ["admin", "user"]},
-                "Roles": {"type": "array", "items": {"$ref": "#/$defs/Role"}},
-            },
-        }
-        out = self.generate_and_compile(schema)
-        # Exactly one Role enum is generated.
-        self.assertIn("enum class Role : int { admin, user };", out)
-        self.assertNotIn("enum class Role1 : int", out)
-        self.assertNotIn("enum class Role2 : int", out)
-        # The array of enum is represented by a single kind.
-        m = re.search(r"enum class Kind : uint8_t \{([^}]+)\}", out)
-        self.assertIsNotNone(m)
-        enumerators = [e.strip() for e in m.group(1).split(",")]
-        self.assertEqual(enumerators.count("Arr0"), 1)
-        # All four fields use the same C++ types.
-        self.assertIn("std::optional<Role> role1;", out)
-        self.assertIn("std::optional<Role> role2;", out)
-        self.assertIn("std::optional<std::vector<Role>> roles1;", out)
-        self.assertIn("std::optional<std::vector<Role>> roles2;", out)
-
-
 class SchemagenAdditionalPropertiesTest(unittest.TestCase):
     def run_schemagen(self, schema, args=None):
         """Run schemagen on a schema dict. Returns (returncode, stdout, stderr)."""
@@ -268,14 +112,17 @@ class SchemagenAdditionalPropertiesTest(unittest.TestCase):
         self.assertNotEqual(rc, 0)
         self.assertIn("additionalProperties: true is not supported", stderr)
 
-    def test_additional_properties_absent_rejected(self):
+    def test_additional_properties_absent_defaults_to_strict(self):
         schema = {
             "type": "object",
             "properties": {"name": {"type": "string"}},
         }
         rc, stdout, stderr = self.run_schemagen(schema)
-        self.assertNotEqual(rc, 0)
+        self.assertEqual(rc, 0, msg=stderr)
-        self.assertIn("additionalProperties is required for object schemas", stderr)
+        # The generated parser should reject unknown keys. Verify the key-matching
+        # helper returns -1 for an unknown key and cbKeyData rejects it.
+        self.assertIn("int matchKey(Kind k, std::string_view key) const {", stdout)
+        self.assertNotIn("bool isStrict(Kind k) const", stdout)
 
     def test_additional_properties_false_accepted(self):
         schema = {
@@ -287,578 +134,5 @@ class SchemagenAdditionalPropertiesTest(unittest.TestCase):
         self.assertEqual(rc, 0, msg=stderr)
 
 
-class SchemagenCyclicArrayTest(unittest.TestCase):
-    """Regression tests for issue #33: cyclic array $ref targets."""
-
-    def run_schemagen(self, schema, args=None):
-        """Run schemagen on a schema dict. Returns (returncode, stdout, stderr)."""
-        with tempfile.NamedTemporaryFile("w", suffix=".json", delete=False) as fp:
-            json.dump(schema, fp)
-            schema_path = fp.name
-        try:
-            cmd = [sys.executable, SCRIPT, schema_path]
-            if args:
-                cmd.extend(args)
-            result = subprocess.run(cmd, capture_output=True, text=True, check=False)
-            return result.returncode, result.stdout, result.stderr
-        finally:
-            os.unlink(schema_path)
-
-    def test_direct_self_referential_array_rejected(self):
-        schema = {
-            "type": "array",
-            "items": {"$ref": "#/$defs/Node"},
-            "$defs": {
-                "Node": {
-                    "type": "array",
-                    "items": {"$ref": "#/$defs/Node"},
-                }
-            },
-        }
-        rc, stdout, stderr = self.run_schemagen(schema)
-        self.assertNotEqual(rc, 0)
-        self.assertIn("recursive array type is not supported", stderr)
-        self.assertIn("Node", stderr)
-
-    def test_object_field_to_self_referential_array_rejected(self):
-        schema = {
-            "type": "object",
-            "additionalProperties": False,
-            "properties": {"items": {"$ref": "#/$defs/Items"}},
-            "$defs": {
-                "Items": {
-                    "type": "array",
-                    "items": {"$ref": "#/$defs/Items"},
-                }
-            },
-        }
-        rc, stdout, stderr = self.run_schemagen(schema)
-        self.assertNotEqual(rc, 0)
-        self.assertIn("recursive array type is not supported", stderr)
-        self.assertIn("Items", stderr)
-
-    def test_chain_of_array_refs_rejected(self):
-        schema = {
-            "type": "object",
-            "additionalProperties": False,
-            "properties": {"x": {"$ref": "#/$defs/A"}},
-            "$defs": {
-                "A": {"type": "array", "items": {"$ref": "#/$defs/B"}},
-                "B": {"type": "array", "items": {"$ref": "#/$defs/A"}},
-            },
-        }
-        rc, stdout, stderr = self.run_schemagen(schema)
-        self.assertNotEqual(rc, 0)
-        self.assertIn("recursive array type is not supported", stderr)
-
-    def test_non_recursive_array_refs_still_allowed(self):
-        schema = {
-            "type": "object",
-            "additionalProperties": False,
-            "properties": {"roles": {"$ref": "#/$defs/Roles"}},
-            "$defs": {
-                "Role": {"enum": ["admin", "user"]},
-                "Roles": {
-                    "type": "array",
-                    "items": {"$ref": "#/$defs/Role"},
-                },
-            },
-        }
-        rc, stdout, stderr = self.run_schemagen(schema)
-        self.assertEqual(rc, 0, msg=stderr)
-        self.assertIn("std::optional<std::vector<Role>> roles;", stdout)
-
-
-class SchemagenCyclicNullableObjectTest(unittest.TestCase):
-    """Regression tests for issue #14: nullable cyclic $ref targets."""
-
-    def setUp(self):
-        self.repo_root = os.path.dirname(
-            os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
-        )
-        self.include_dir = os.path.join(self.repo_root, "include")
-        self.lib_src = os.path.join(self.repo_root, "src", "lib.cpp")
-        self.compiler = shutil.which("c++")
-
-    def _compile_harness(self, tmpdir, schema, harness):
-        schema_path = os.path.join(tmpdir, "schema.json")
-        with open(schema_path, "w") as fp:
-            json.dump(schema, fp)
-        header_path = os.path.join(tmpdir, "gen.h")
-        result = subprocess.run(
-            [
-                sys.executable,
-                SCRIPT,
-                schema_path,
-                "-o",
-                header_path,
-                "--namespace",
-                "test_schema",
-            ],
-            capture_output=True,
-            text=True,
-            check=False,
-        )
-        self.assertEqual(result.returncode, 0, msg=result.stderr)
-
-        lib_obj = os.path.join(tmpdir, "lib.o")
-        comp_lib = subprocess.run(
-            [
-                self.compiler,
-                "-std=c++20",
-                "-I",
-                self.include_dir,
-                "-I",
-                os.path.join(self.repo_root, "third_party", "include"),
-                "-I",
-                os.path.join(self.repo_root, "third_party", "valgrind"),
-                "-c",
-                self.lib_src,
-                "-o",
-                lib_obj,
-            ],
-            capture_output=True,
-            text=True,
-            check=False,
-        )
-        self.assertEqual(comp_lib.returncode, 0, msg=comp_lib.stderr)
-
-        cpp_path = os.path.join(tmpdir, "test.cpp")
-        with open(cpp_path, "w") as fp:
-            fp.write(harness)
-
-        exe_path = os.path.join(tmpdir, "test")
-        comp = subprocess.run(
-            [
-                self.compiler,
-                "-std=c++20",
-                "-I",
-                self.include_dir,
-                "-I",
-                tmpdir,
-                lib_obj,
-                cpp_path,
-                "-o",
-                exe_path,
-            ],
-            capture_output=True,
-            text=True,
-            check=False,
-        )
-        self.assertEqual(comp.returncode, 0, msg=comp.stderr)
-        run = subprocess.run([exe_path], capture_output=True, text=True, check=False)
-        self.assertEqual(run.returncode, 0, msg=run.stdout + run.stderr)
-
-    def test_self_referential_nullable_object_accepts_nested_null(self):
-        """A nullable object $def must stay nullable on recursive $refs."""
-        if not self.compiler:
-            self.skipTest("C++ compiler not available")
-        schema = {
-            "type": "object",
-            "additionalProperties": False,
-            "properties": {"self": {"$ref": "#/$defs/Self"}},
-            "$defs": {
-                "Self": {
-                    "type": ["object", "null"],
-                    "additionalProperties": False,
-                    "properties": {"self": {"$ref": "#/$defs/Self"}},
-                }
-            },
-        }
-        harness = textwrap.dedent(
-            """
-            #include "gen.h"
-            #include <cstdio>
-            #include <cstring>
-            struct Case { const char *s; WeaselJsonStatus expected; };
-            int main() {
-              Case cases[] = {
-                { R"({"self": null})", WeaselJson_OK },
-                { R"({"self": {"self": null}})", WeaselJson_OK },
-                { R"({"self": {"self": {}}})", WeaselJson_OK },
-              };
-              for (const auto &c : cases) {
-                test_schema::RootBuilder b;
-                char buf[256];
-                std::strncpy(buf, c.s, sizeof(buf) - 1);
-                buf[sizeof(buf) - 1] = '\\0';
-                WeaselJsonStatus st = b.feed(buf, std::strlen(buf));
-                st = b.finish();
-                if (st != c.expected) {
-                  std::printf("case %s expected %d got %d\\n", c.s, c.expected, st);
-                  return 1;
-                }
-              }
-              return 0;
-            }
-            """
-        )
-        with tempfile.TemporaryDirectory() as tmpdir:
-            self._compile_harness(tmpdir, schema, harness)
-
-
-class SchemagenIntegerBoundaryTest(unittest.TestCase):
-    """Regression tests for issue #19: integer slot parsing near int64 boundaries."""
-
-    def setUp(self):
-        self.repo_root = os.path.dirname(
-            os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
-        )
-        self.include_dir = os.path.join(self.repo_root, "include")
-        self.lib_src = os.path.join(self.repo_root, "src", "lib.cpp")
-        self.compiler = shutil.which("c++")
-
-    def _compile_harness(self, tmpdir, schema, harness):
-        schema_path = os.path.join(tmpdir, "schema.json")
-        with open(schema_path, "w") as fp:
-            json.dump(schema, fp)
-        header_path = os.path.join(tmpdir, "gen.h")
-        result = subprocess.run(
-            [
-                sys.executable,
-                SCRIPT,
-                schema_path,
-                "-o",
-                header_path,
-                "--namespace",
-                "test_schema",
-            ],
-            capture_output=True,
-            text=True,
-            check=False,
-        )
-        self.assertEqual(result.returncode, 0, msg=result.stderr)
-
-        lib_obj = os.path.join(tmpdir, "lib.o")
-        comp_lib = subprocess.run(
-            [
-                self.compiler,
-                "-std=c++20",
-                "-I",
-                self.include_dir,
-                "-I",
-                os.path.join(self.repo_root, "third_party", "include"),
-                "-I",
-                os.path.join(self.repo_root, "third_party", "valgrind"),
-                "-c",
-                self.lib_src,
-                "-o",
-                lib_obj,
-            ],
-            capture_output=True,
-            text=True,
-            check=False,
-        )
-        self.assertEqual(comp_lib.returncode, 0, msg=comp_lib.stderr)
-
-        cpp_path = os.path.join(tmpdir, "test.cpp")
-        with open(cpp_path, "w") as fp:
-            fp.write(harness)
-
-        exe_path = os.path.join(tmpdir, "test")
-        comp = subprocess.run(
-            [
-                self.compiler,
-                "-std=c++20",
-                "-I",
-                self.include_dir,
-                "-I",
-                tmpdir,
-                lib_obj,
-                cpp_path,
-                "-o",
-                exe_path,
-            ],
-            capture_output=True,
-            text=True,
-            check=False,
-        )
-        self.assertEqual(comp.returncode, 0, msg=comp.stderr)
-        run = subprocess.run([exe_path], capture_output=True, text=True, check=False)
-        self.assertEqual(run.returncode, 0, msg=run.stdout + run.stderr)
-
-    def _build_cases_array(self, name, entries):
-        lines = [
-            f"  struct {name}Case {{ const char *s; WeaselJsonStatus expected; long long v; }};"
-        ]
-        lines.append(f"  {name}Case {name}_cases[] = {{")
-        for s, exp, v in entries:
-            val = f"{v}LL" if isinstance(v, int) else v
-            lines.append(f'    {{ R"({s})", {exp}, {val} }},')
-        lines.append("  };")
-        return "\n".join(lines)
-
-    def test_integer_boundary_root(self):
-        if not self.compiler:
-            self.skipTest("C++ compiler not available")
-        cases = [
-            ("9223372036854775807.0", "WeaselJson_OK", 9223372036854775807),
-            ("9223372036854775807", "WeaselJson_OK", 9223372036854775807),
-            ("9223372036854775806.0", "WeaselJson_OK", 9223372036854775806),
-            ("9223372036854775808", "WeaselJson_REJECT", 0),
-            ("-9223372036854775808", "WeaselJson_OK", "-9223372036854775807LL - 1"),
-            ("-9223372036854775808.0", "WeaselJson_OK", "-9223372036854775807LL - 1"),
-            ("-9223372036854775809", "WeaselJson_REJECT", 0),
-            ("1e3", "WeaselJson_OK", 1000),
-            ("2.0", "WeaselJson_OK", 2),
-            ("0.001", "WeaselJson_REJECT", 0),
-            ("1e-3", "WeaselJson_REJECT", 0),
-            ("1000e-3", "WeaselJson_OK", 1),
-            ("100.0e-2", "WeaselJson_OK", 1),
-            ("0.0001e4", "WeaselJson_OK", 1),
-            ("0.001e3", "WeaselJson_OK", 1),
-            ("123.0", "WeaselJson_OK", 123),
-            ("9e18", "WeaselJson_OK", 9000000000000000000),
-            ("10e18", "WeaselJson_REJECT", 0),
-            # Issue #56: zero written with a negative exponent must be accepted.
-            ("0e-1", "WeaselJson_OK", 0),
-            ("0e-2", "WeaselJson_OK", 0),
-            ("0.0e-2", "WeaselJson_OK", 0),
-            ("-0e-2", "WeaselJson_OK", 0),
-            ("0e-20", "WeaselJson_OK", 0),
-            ("0.000e-5", "WeaselJson_OK", 0),
-        ]
-        cases_src = self._build_cases_array("root", cases)
-        harness = textwrap.dedent(
-            f"""
-            #include "gen.h"
-            #include <cstdio>
-            #include <cstring>
-            {cases_src}
-            int main() {{
-              for (const auto \u0026c : root_cases) {{
-                test_schema::RootBuilder b;
-                char buf[512];
-                std::strncpy(buf, c.s, sizeof(buf) - 1);
-                buf[sizeof(buf) - 1] = '\\0';
-                WeaselJsonStatus st = b.feed(buf, std::strlen(buf));
-                st = b.finish();
-                if (st != c.expected) {{
-                  std::printf("root case %s expected %d got %d\\n", c.s, c.expected, st);
-                  return 1;
-                }}
-                if (st == WeaselJson_OK \u0026\u0026 b.take() != c.v) {{
-                  std::printf("root case %s value mismatch\\n", c.s);
-                  return 2;
-                }}
-              }}
-              return 0;
-            }}
-            """
-        )
-        with tempfile.TemporaryDirectory() as tmpdir:
-            self._compile_harness(tmpdir, {"type": "integer"}, harness)
-
-    def test_integer_boundary_object_field(self):
-        if not self.compiler:
-            self.skipTest("C++ compiler not available")
-        cases = [
-            ('{"age":9223372036854775807.0}', "WeaselJson_OK", 9223372036854775807),
-            ('{"age":-9223372036854775809}', "WeaselJson_REJECT", 0),
-            ('{"age":1e3}', "WeaselJson_OK", 1000),
-            ('{"age":2.0}', "WeaselJson_OK", 2),
-            ('{"age":0.0001e4}', "WeaselJson_OK", 1),
-            ('{"age":0.001}', "WeaselJson_REJECT", 0),
-            # Issue #56: zero written with a negative exponent must be accepted.
-            ('{"age":0e-2}', "WeaselJson_OK", 0),
-            ('{"age":-0e-20}', "WeaselJson_OK", 0),
-            (
-                '{"age":-9223372036854775808.0}',
-                "WeaselJson_OK",
-                "-9223372036854775807LL - 1",
-            ),
-        ]
-        cases_src = self._build_cases_array("object", cases)
-        harness = textwrap.dedent(
-            f"""
-            #include "gen.h"
-            #include <cstdio>
-            #include <cstring>
-            {cases_src}
-            int main() {{
-              for (const auto \u0026c : object_cases) {{
-                test_schema::RootBuilder b;
-                char buf[512];
-                std::strncpy(buf, c.s, sizeof(buf) - 1);
-                buf[sizeof(buf) - 1] = '\\0';
-                WeaselJsonStatus st = b.feed(buf, std::strlen(buf));
-                st = b.finish();
-                if (st != c.expected) {{
-                  std::printf("object case %s expected %d got %d\\n", c.s, c.expected, st);
-                  return 3;
-                }}
-                if (st == WeaselJson_OK \u0026\u0026 b.take().age != c.v) {{
-                  std::printf("object case %s value mismatch\\n", c.s);
-                  return 4;
-                }}
-              }}
-              return 0;
-            }}
-            """
-        )
-        schema = {
-            "type": "object",
-            "additionalProperties": False,
-            "properties": {"age": {"type": "integer"}},
-            "required": ["age"],
-        }
-        with tempfile.TemporaryDirectory() as tmpdir:
-            self._compile_harness(tmpdir, schema, harness)
-
-    def test_integer_no_quadratic_leading_zero_loop(self):
-        """Regression test for issue #34: leading-zero stripping must not be quadratic."""
-        with tempfile.TemporaryDirectory() as tmpdir:
-            schema_path = os.path.join(tmpdir, "schema.json")
-            with open(schema_path, "w") as fp:
-                json.dump({"type": "integer"}, fp)
-            result = subprocess.run(
-                [sys.executable, SCRIPT, schema_path],
-                capture_output=True,
-                text=True,
-                check=False,
-            )
-            self.assertEqual(result.returncode, 0, msg=result.stderr)
-            self.assertIn("parseJsonInt64", result.stdout)
-            self.assertNotIn("digits.erase(digits.begin())", result.stdout)
-
-    def test_integer_large_fractional_leading_zeros(self):
-        """Numbers with many leading fractional zeros must parse correctly."""
-        if not self.compiler:
-            self.skipTest("C++ compiler not available")
-        harness = textwrap.dedent(
-            """
-            #include "gen.h"
-            #include <cstdio>
-            #include <string>
-            int main() {
-              const int n = 100000;
-              std::string s = std::string("0.") + std::string(n - 1, '0') + "1e" + std::to_string(n);
-              test_schema::RootBuilder b;
-              WeaselJsonStatus st = b.feed(s.data(), static_cast<int>(s.size()));
-              st = b.finish();
-              if (st != WeaselJson_OK) {
-                std::printf("expected OK, got %d\\n", st);
-                return 1;
-              }
-              if (b.take() != 1) {
-                std::printf("expected value 1\\n");
-                return 2;
-              }
-              return 0;
-            }
-            """
-        )
-        with tempfile.TemporaryDirectory() as tmpdir:
-            self._compile_harness(tmpdir, {"type": "integer"}, harness)
-
-
-class SchemagenStringEscapeTest(unittest.TestCase):
-    """Regression tests for issue #35: control characters in string literals."""
-
-    def setUp(self):
-        self.repo_root = os.path.dirname(
-            os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
-        )
-        self.include_dir = os.path.join(self.repo_root, "include")
-        self.compiler = shutil.which("c++")
-
-    def generate_and_compile(self, schema):
-        """Run schemagen on schema and syntax-check the resulting header."""
-        with tempfile.TemporaryDirectory() as tmpdir:
-            schema_path = os.path.join(tmpdir, "schema.json")
-            with open(schema_path, "w") as fp:
-                json.dump(schema, fp)
-            header_path = os.path.join(tmpdir, "gen.h")
-            cmd = [
-                sys.executable,
-                SCRIPT,
-                schema_path,
-                "-o",
-                header_path,
-                "--namespace",
-                "test_schema",
-            ]
-            result = subprocess.run(cmd, capture_output=True, text=True, check=False)
-            self.assertEqual(result.returncode, 0, msg=result.stderr)
-
-            if self.compiler:
-                cpp_path = os.path.join(tmpdir, "test.cpp")
-                with open(cpp_path, "w") as fp:
-                    fp.write(
-                        '#include "gen.h"\n'
-                        "int main() {\n"
-                        "  test_schema::RootBuilder b;\n"
-                        "  test_schema::Root r = b.take();\n"
-                        "  (void)r;\n"
-                        "}\n"
-                    )
-                comp = subprocess.run(
-                    [
-                        self.compiler,
-                        "-std=c++20",
-                        "-fsyntax-only",
-                        "-I",
-                        self.include_dir,
-                        "-I",
-                        tmpdir,
-                        cpp_path,
-                    ],
-                    capture_output=True,
-                    text=True,
-                    check=False,
-                )
-                self.assertEqual(comp.returncode, 0, msg=comp.stderr)
-
-            with open(header_path) as fp:
-                return fp.read()
-
-    def test_newline_in_property_key(self):
-        """A JSON key containing a newline must become a valid C++ literal."""
-        schema = {
-            "type": "object",
-            "additionalProperties": False,
-            "properties": {"a\nb": {"type": "string"}},
-        }
-        out = self.generate_and_compile(schema)
-        self.assertIn('// "a\\nb"', out)
-        self.assertIn('if (key == "a\\nb") return 0;', out)
-
-    def test_newline_in_enum_value(self):
-        """An enum value containing a newline must become a valid C++ literal."""
-        schema = {
-            "type": "object",
-            "additionalProperties": False,
-            "properties": {"x": {"enum": ["a\nb"]}},
-        }
-        out = self.generate_and_compile(schema)
-        self.assertIn('static constexpr const char *X_names[] = { "a\\nb" };', out)
-
-    def test_mixed_control_chars_in_enum_value(self):
-        """Mixed control characters in an enum value must be escaped."""
-        schema = {
-            "type": "object",
-            "additionalProperties": False,
-            "properties": {
-                "x": {"enum": ["x\ny\rz\tw\vq\x00\x01"]},
-            },
-        }
-        out = self.generate_and_compile(schema)
-        self.assertIn(
-            'static constexpr const char *X_names[] = { "x\\ny\\rz\\tw\\vq\\u0000\\u0001" };',
-            out,
-        )
-
-    def test_backslash_and_quote_still_escaped(self):
-        """Existing escaping for backslash and double quote must remain correct."""
-        schema = {
-            "type": "object",
-            "additionalProperties": False,
-            "properties": {'a"b\\c': {"type": "string"}},
-        }
-        out = self.generate_and_compile(schema)
-        self.assertIn('// "a\\"b\\\\c"', out)
-        self.assertIn('if (key == "a\\"b\\\\c") return 0;', out)
-
-
 if __name__ == "__main__":
     unittest.main()

contrib/schemagen/weaseljson_schemagen.py

@@ -18,43 +18,6 @@ import keyword
 import sys
 
 
-def _escape_cpp_string(s):
-    """Return *s* escaped for use inside a C++ double-quoted string literal.
-
-    JSON strings may contain control characters; emitting them verbatim into
-    generated C++ source breaks tokenization.  This helper escapes backslashes
-    and double quotes, maps common control characters to their short escape
-    sequences, and uses universal character names (\\u00XX) for any other
-    character below 0x20.
-    """
-    out = []
-    for ch in s:
-        cp = ord(ch)
-        if cp == 0x09:
-            out.append("\\t")
-        elif cp == 0x0A:
-            out.append("\\n")
-        elif cp == 0x0B:
-            out.append("\\v")
-        elif cp == 0x0C:
-            out.append("\\f")
-        elif cp == 0x0D:
-            out.append("\\r")
-        elif cp == 0x08:
-            out.append("\\b")
-        elif cp == 0x07:
-            out.append("\\a")
-        elif cp < 0x20:
-            out.append(f"\\u{cp:04X}")
-        elif ch == "\\":
-            out.append("\\\\")
-        elif ch == '"':
-            out.append('\\"')
-        else:
-            out.append(ch)
-    return "".join(out)
-
-
 class GenError(Exception):
     pass
 
@@ -252,44 +215,12 @@ class Builder:
         base = camel(hint)
         name = base
         i = 1
-        while self._name_taken(name):
+        while name in self._used_names:
-            candidate = f"{base}{i}"
-            # A numeric suffix can itself land on a reserved generated name
-            # (e.g. hint "Arr0" -> "Arr01").  Use an underscore separator so
-            # we never loop through the reserved block.
-            if self._is_reserved(candidate):
-                candidate = f"{base}_{i}"
-            name = candidate
             i += 1
+            name = f"{base}{i}"
         self._used_names.add(name)
         return name
 
-    def _name_taken(self, name):
-        return name in self._used_names or self._is_reserved(name)
-
-    @staticmethod
-    def _is_reserved(name):
-        """Names generated internally that must not collide with user types."""
-        return name in ("Root", "RootScalar")
-
-    @staticmethod
-    def _array_reaches(target, ty):
-        """Return True if `target` can be reached from `ty` by following
-        TArr element types. This detects self-referential array cycles that
-        cannot be expressed as C++ structs."""
-        seen = set()
-        stack = [ty]
-        while stack:
-            cur = stack.pop()
-            if cur is target:
-                return True
-            if id(cur) in seen:
-                continue
-            seen.add(id(cur))
-            if isinstance(cur, TArr):
-                stack.append(cur.elem)
-        return False
-
     def ref_name(self, ref):
         if not ref.startswith("#/"):
             raise GenError(f"only local $ref supported, got: {ref}")
@@ -305,6 +236,7 @@ class Builder:
         if defname not in self.defs:
             raise GenError(f"$ref to unknown def: {defname}")
         node = self.defs[defname]
+        # For objects we must register the name before recursing into fields.
         return self.build_type(node, defname, defname=defname)
 
     def build_type(self, node, hint, defname=None):
@@ -333,10 +265,6 @@ class Builder:
         if "$ref" in node:
             return self.build_def(self.ref_name(node["$ref"]))
 
-        # Non-object $defs entries must reuse the same type for every $ref.
-        if defname is not None and defname in self._building:
-            return self._building[defname]
-
         # nullability via type lists: ["string", "null"]
         nullable = False
         typ = node.get("type")
@@ -355,35 +283,18 @@ class Builder:
                 raise GenError("only non-empty string enums are supported")
             name = defname and self.unique_name(defname) or self.unique_name(hint)
             self.enums[name] = EnumType(name, list(vals))
-            result = (TEnum(name), nullable)
+            return (TEnum(name), nullable)
-            if defname is not None:
-                self._building[defname] = result
-            return result
 
         if typ == "object" or (typ is None and "properties" in node):
-            return (self._build_object(node, hint, defname, nullable), nullable)
+            return (self._build_object(node, hint, defname), nullable)
 
         if typ == "array":
             if "items" not in node or not isinstance(node["items"], dict):
                 raise GenError("arrays require a single 'items' schema")
-            # Register the array before building its items so $ref cycles back
-            # to this definition resolve to the same TArr instance.
-            t = TArr(None, False)
-            result = (t, nullable)
-            if defname is not None:
-                self._building[defname] = result
             elem, elem_nullable = self._unpack(
                 self.build_type(node["items"], hint + "Item")
             )
-            t.elem = elem
+            return (TArr(elem, elem_nullable), nullable)
-            t.elem_nullable = elem_nullable
-            # Self-referential array cycles (directly or through a chain of
-            # array definitions) cannot be represented as a C++ value type.
-            if self._array_reaches(t, elem):
-                raise GenError(
-                    "recursive array type is not supported: " f"{defname or hint!r}"
-                )
-            return result
 
         scalar = {
             "string": "str",
@@ -392,10 +303,7 @@ class Builder:
             "boolean": "bool",
         }.get(typ)
         if scalar:
-            result = (TScalar(scalar), nullable)
+            return (TScalar(scalar), nullable)
-            if defname is not None:
-                self._building[defname] = result
-            return result
         if typ == "null":
             raise GenError("'null'-only types are not supported")
 
@@ -409,21 +317,14 @@ class Builder:
             return result
         return (result, False)
 
-    def _build_object(self, node, hint, defname, nullable=False):
+    def _build_object(self, node, hint, defname):
         name = self.unique_name(defname or hint)
         obj = ObjectType(name)
         self.objects[name] = obj
         # register for $ref cycles before building fields
-        tobj = TObj(name)
         if defname is not None:
-            self._building[defname] = (tobj, nullable)
+            self._building[defname] = TObj(name)
-        ap = node.get("additionalProperties", None)
+        ap = node.get("additionalProperties", False)
-        if ap is None:
-            raise GenError(
-                "additionalProperties is required for object schemas; set it "
-                "explicitly to false to reject unknown keys (absent "
-                "additionalProperties is not supported)"
-            )
         if ap is True:
             raise GenError("additionalProperties: true is not supported")
         if isinstance(ap, dict):
@@ -443,7 +344,7 @@ class Builder:
                 cpp = f"{base}{i}"
             seen_cpp.add(cpp)
             obj.fields.append(Field(key, cpp, ty, key in required, nullable))
-        return tobj
+        return TObj(name)
 
 
 # ---------------------------------------------------------------------------
@@ -534,7 +435,6 @@ class Emitter:
         self.kind_order = []  # all Kind enumerators in declaration order
         self.root_ty = None
         self.root_nullable = False
-        self._arr_counter = 0
 
     # -- type strings -------------------------------------------------------
     def base_cpp(self, ty):
@@ -565,19 +465,11 @@ class Emitter:
     def arr_kind(self, tarr):
         sig = self.base_cpp(tarr)
         if sig not in self.arr_kinds:
-            name = self._fresh_arr_kind_name()
+            name = f"Arr{len(self.arr_kinds)}"
             self.arr_kinds[sig] = name
             self.arr_types.append((name, tarr))
-            self.b._used_names.add(name)
         return self.arr_kinds[sig]
 
-    def _fresh_arr_kind_name(self):
-        while True:
-            name = f"Arr{self._arr_counter}"
-            self._arr_counter += 1
-            if not self.b._name_taken(name):
-                return name
-
     def cat(self, ty):
         if isinstance(ty, TScalar):
             return {"str": "Str", "int": "Int", "dbl": "Dbl", "bool": "Bool"}[ty.kind]
@@ -601,18 +493,6 @@ class Emitter:
         self.root_ty, self.root_nullable = Builder._unpack(
             self.b.build_type(self.b.root_schema, "Root")
         )
-
-        # A nullable root object would otherwise produce
-        #   using Root = std::optional<Root>;
-        # which conflicts with the struct named Root.  Rename the inner struct.
-        if isinstance(self.root_ty, TObj) and self.root_nullable:
-            old_name = self.root_ty.name
-            new_name = self.b.unique_name("RootInner")
-            obj = self.b.objects.pop(old_name)
-            obj.name = new_name
-            self.b.objects[new_name] = obj
-            self.root_ty = TObj(new_name)
-
         break_cycles(self.b.objects)
 
         # register all array kinds (walk every field + root)
@@ -685,8 +565,7 @@ namespace {ns} {{"""
                     and f.ty.kind in ("int", "dbl", "bool")
                 ):
                     init = " = 0" if f.ty.kind != "bool" else " = false"
-                esc_key = _escape_cpp_string(f.key)
+                out.append(f'  {store} {f.cpp}{init};  // "{f.key}"')
-                out.append(f'  {store} {f.cpp}{init};  // "{esc_key}"')
             out.append("};")
             out.append("")
         return "\n".join(out)
@@ -703,7 +582,9 @@ namespace {ns} {{"""
     def _kind_enum(self):
         kinds = list(self.b.objects.keys())
         kinds += [n for n, _ in self.arr_types]
-        root_is_container = isinstance(self.root_ty, (TObj, TArr))
+        root_is_container = (
+            isinstance(self.root_ty, (TObj, TArr)) and not self.root_nullable
+        )
         if not root_is_container:
             kinds.append("RootScalar")
         self.kind_order = kinds
@@ -711,9 +592,9 @@ namespace {ns} {{"""
 
     def _root_info(self):
         """Return (root_cat, root_container_kind_or_None)."""
-        if isinstance(self.root_ty, TObj):
+        if isinstance(self.root_ty, TObj) and not self.root_nullable:
             return ("Obj", f"Kind::{self.root_ty.name}")
-        if isinstance(self.root_ty, TArr):
+        if isinstance(self.root_ty, TArr) and not self.root_nullable:
             return ("Arr", f"Kind::{self.arr_kind(self.root_ty)}")
         return (self.cat(self.root_ty), None)
 
@@ -783,12 +664,7 @@ namespace {ns} {{"""
             lines.append("    }")
         root_cat, root_kind = self._root_info()
         if root_kind is None:
-            if self.root_nullable:
+            lines.append("    case Kind::RootScalar: return &result_;")
-                lines.append(
-                    "    case Kind::RootScalar: { if (!result_) result_.emplace(); return &*result_; }"
-                )
-            else:
-                lines.append("    case Kind::RootScalar: return &result_;")
         lines.append("    default: return nullptr;")
         lines.append("    }")
         lines.append("  }")
@@ -814,7 +690,7 @@ namespace {ns} {{"""
         for name, obj in self.b.objects.items():
             lines.append(f"    case Kind::{name}:")
             for i, fld in enumerate(obj.fields):
-                esc = _escape_cpp_string(fld.key)
+                esc = fld.key.replace("\\", "\\\\").replace('"', '\\"')
                 lines.append(f'      if (key == "{esc}") return {i};')
             lines.append("      return -1;")
         lines.append("    default: return -1;")
@@ -897,7 +773,10 @@ namespace {ns} {{"""
     def _enum_name_arrays(self):
         out = []
         for e in self.b.enums.values():
-            lits = ", ".join('"' + _escape_cpp_string(v) + '"' for v in e.values)
+            lits = ", ".join(
+                '"' + v.replace("\\", "\\\\").replace('"', '\\"') + '"'
+                for v in e.values
+            )
             out.append(
                 f"  static constexpr const char *{e.name}_names[] = {{ {lits} }};"
             )
@@ -916,12 +795,7 @@ namespace {ns} {{"""
         lines = ["    if (error_) return;"]
         if root_kind is not None and root_cat == event_cat:
             lines.append("    if (stack_.empty()) {")
-            if self.root_nullable:
+            lines.append(f"      stack_.push_back(Frame{{{root_kind}, &result_}});")
-                lines.append("      result_.emplace();")
-                dest = "&*result_"
-            else:
-                dest = "&result_"
-            lines.append(f"      stack_.push_back(Frame{{{root_kind}, {dest}}});")
             if event_cat == "Obj":
                 lines.append("      {")
                 lines.append(f"        int n = fieldCount({root_kind});")
@@ -947,9 +821,6 @@ namespace {ns} {{"""
         root_cat, root_kind = self._root_info()
         begin_obj = self._begin_container("Obj", root_kind)
         begin_arr = self._begin_container("Arr", root_kind)
-        null_at_root = (
-            "done_ = true; return;" if self.root_nullable else "reject(); return;"
-        )
 
         return f"""
 class RootBuilder {{
@@ -957,10 +828,6 @@ public:
   explicit RootBuilder(int stackSize = 1024) {{
     cb_ = makeCallbacks();
     parser_ = WeaselJsonParser_create(stackSize, &cb_, this, 0);
-    if (!parser_) {{
-      error_ = true;
-      return;
-    }}
 {self._ctor_body()}
   }}
   ~RootBuilder() {{ if (parser_) WeaselJsonParser_destroy(parser_); }}
@@ -1016,92 +883,6 @@ private:
 
   void reject() {{ error_ = true; }}
 
-  // Parse a JSON number text as int64_t.  Accepts optional decimal point and
-  // exponent only when the mathematical value is an integer that fits in a
-  // signed 64-bit range.
-  static bool parseJsonInt64(const char *b, const char *e, int64_t &out) {{
-    const char *p = b;
-    bool neg = false;
-    if (p < e) {{
-      if (*p == '-') {{ neg = true; ++p; }}
-      else if (*p == '+') return false;
-    }}
-    const char *intStart = p;
-    while (p < e && *p >= '0' && *p <= '9') ++p;
-    const char *intEnd = p;
-    int fracDigits = 0;
-    const char *fracStart = p;
-    if (p < e && *p == '.') {{
-      ++p;
-      fracStart = p;
-      while (p < e && *p >= '0' && *p <= '9') {{ ++p; ++fracDigits; }}
-      if (fracStart == p) return false;
-    }}
-    int64_t exp = 0;
-    bool expNeg = false;
-    if (p < e && (*p == 'e' || *p == 'E')) {{
-      ++p;
-      if (p < e && (*p == '-' || *p == '+')) {{ expNeg = (*p == '-'); ++p; }}
-      if (p == e || *p < '0' || *p > '9') return false;
-      while (p < e && *p >= '0' && *p <= '9') {{
-        int digit = *p - '0';
-        if (exp <= (INT64_MAX - digit) / 10) exp = exp * 10 + digit;
-        else exp = INT64_MAX;
-        ++p;
-      }}
-      if (expNeg) exp = -exp;
-    }}
-    if (p != e) return false;
-    if (intStart == intEnd) return false;
-
-    std::string digits;
-    digits.reserve((intEnd - intStart) + fracDigits);
-    for (const char *q = intStart; q < intEnd; ++q) digits.push_back(*q);
-    for (int i = 0; i < fracDigits; ++i) digits.push_back(fracStart[i]);
-    int64_t trim = 0;
-    while (!digits.empty() && digits.back() == '0') {{
-      digits.pop_back();
-      ++trim;
-    }}
-    int64_t finalExp = exp - fracDigits + trim;
-    size_t leadingZeros = 0;
-    while (leadingZeros < digits.size() && digits[leadingZeros] == '0') ++leadingZeros;
-    if (leadingZeros == digits.size()) {{ out = 0; return true; }}
-    if (finalExp < 0) return false;
-    if (leadingZeros > 0) digits.erase(0, leadingZeros);
-
-    constexpr uint64_t kMaxNeg = 9223372036854775808ULL;
-    constexpr uint64_t kMaxPos = 9223372036854775807ULL;
-    const uint64_t limit = neg ? kMaxNeg : kMaxPos;
-
-    if (finalExp > 19) return false;
-    int64_t maxSig = 19 - finalExp;
-    uint64_t mag = 0;
-    int64_t sigDigits = 0;
-    for (char ch : digits) {{
-      uint64_t d = static_cast<uint64_t>(ch - '0');
-      if (sigDigits >= maxSig) return false;
-      if (mag > (limit - d) / 10) return false;
-      mag = mag * 10 + d;
-      ++sigDigits;
-    }}
-    for (int64_t i = 0; i < finalExp; ++i) {{
-      if (mag > limit / 10) return false;
-      mag *= 10;
-    }}
-    if (mag > limit) return false;
-    if (neg) {{
-      if (mag == kMaxNeg) {{
-        out = INT64_MIN;
-      }} else {{
-        out = -static_cast<int64_t>(mag);
-      }}
-    }} else {{
-      out = static_cast<int64_t>(mag);
-    }}
-    return true;
-  }}
-
   // Wrap the generated slotInfo() with the generic key state.
   SlotInfo slotInfoG(const Frame &f) {{
     if (isObjectKind(f.kind)) {{
@@ -1169,7 +950,6 @@ private:
 
   void cbStringData(const char *buf, int len, int done) {{
     if (error_) return;
-    if (stack_.empty()) {{ reject(); return; }}
     Frame &f = stack_.back();
     SlotInfo si = slotInfoG(f);
     if (si.cat == Cat::Str) {{
@@ -1196,7 +976,6 @@ private:
 
   void cbNumberData(const char *buf, int len, int done) {{
     if (error_) return;
-    if (stack_.empty()) {{ reject(); return; }}
     Frame &f = stack_.back();
     SlotInfo si = slotInfoG(f);
     if (si.cat != Cat::Int && si.cat != Cat::Dbl) {{ reject(); return; }}
@@ -1213,11 +992,16 @@ private:
         *(int64_t *)p = v;  // plain integer literal: parsed exactly
       }} else {{
         // JSON Schema "integer" accepts any number with no fractional part,
-        // including exponent/decimal forms like 1e3 or 2.0. Parse those
+        // including exponent/decimal forms like 1e3 or 2.0. Parse those as a
-        // exactly as int64 when the value is integral and in range.
+        // double and require an integral value within int64 range.
-        int64_t v2 = 0;
+        double d = 0;
-        if (!parseJsonInt64(b, e, v2)) {{ reject(); return; }}
+        auto rd = std::from_chars(b, e, d);
-        *(int64_t *)p = v2;
+        if (rd.ec != std::errc() || rd.ptr != e || d != std::trunc(d) ||
+            d < -9223372036854775808.0 || d >= 9223372036854775808.0) {{
+          reject();
+          return;
+        }}
+        *(int64_t *)p = (int64_t)d;
       }}
     }} else {{
       double v = 0;
@@ -1230,7 +1014,6 @@ private:
 
   void cbBool(bool value) {{
     if (error_) return;
-    if (stack_.empty()) {{ reject(); return; }}
     Frame &f = stack_.back();
     SlotInfo si = slotInfoG(f);
     if (si.cat != Cat::Bool) {{ reject(); return; }}
@@ -1244,9 +1027,6 @@ private:
 
   void cbNull() {{
     if (error_) return;
-    if (stack_.empty()) {{
-      {null_at_root}
-    }}
     Frame &f = stack_.back();
     SlotInfo si = slotInfoG(f);
     if (!si.nullable) {{ reject(); return; }}

corpus/053b6940e7460ea3ef048249ba14fe0b027b7500

@@ -1 +0,0 @@
-"d\ud82d\udd9c8\ud8ed

corpus/201995319b39de28a83ebd61c3629bd6189ef5a4

@@ -1,43 +0,0 @@
-[4,[5,[5,[4,[6,[5,[5,55,5,[[5,[4,[5,[5,[5,5,[5,[5,[[5,[5,[415,[4,[5,[5,[3,[5,5,[5,[5,[[null,[415,[[5,[5,[415,4,5,[[5,5,[5,[5,[[null,5,[5,[5,[[5,[5,[415,[4,[5,[5,[3,[5,[5,[5,5,[[5,[4,[5,[[5,5,[5,[5,[[null,[415,[4,[5,[[5,[4,[5,[5,[5,5,[5,[5,[[5,[5,[415,[4,[5,[5,[4,[5,[5,[5,5,[[5,[4,[5,[[5,5,[5,[5,[[null,[415,[4,[5,[5,[4,5,[5,5,[[5,[4,[5,[[5,5,[5,[5,[[null,[413,[5,[5,[5,5,[[5,[4,[5,[[5,5,[5,[5,[[null,[415,[4,[5,[[5,[4,[5,[5,[5,5,[5,[5,[[5,[5,[415,[4,[5,[5,[4,[5,[5,[5,5,[[5,[4,[5,[[5,5,[5,[5,[[null,[415,[4,[5,[5,[4,5,[5,5,4,[5,[5,[5,5,[5,[5,[[5,[5,[415,[4,[5,[5,[[5,[[null,[415,[4,[5,[[5,[4,[5,[5,[5,5,[5,[5,[[5,[5,[415,[4,[5,[5,[4,[5,[5,[5,5,[[5,[4,[5,[[5,5,[5,[5,[[null,[415,[4,[5,[5,[4,5,[5,5,[[[5,5,[5,[5,[[null,[415,[[5,[5,[415,4,5,[[5,5,[5,[5,[[null,5,[5,[5,[[5,[5,[415,[4,[5,[5,[3,[5,[5,[5,5,[[5,[4,[5,[[5,5,[5,[5,[[null,[415,[4,[5,[[5,[4,[5,[5,[5,5,[5,[5,[[5,[5,[415,[4,[5,[5,[4,[5,[5,[5,5,[[5,[4,[5,[[5,5,[5,[5,[[null,[415,[4,[5,[5,[4,5,[5,5,[[5,[4,[5,[[5,5,[5,[5,[[null,[413,[5,[5,[5,5,[[5,[4,[5,[[5,5,[5,[5,[[null,[415,[4,[5,[[5,[4,[5,[5,[5,5,[5,[5,[[5,[5,[415,[4,[5,[5,[4,[5,[5,[5,5,[[5,[4,[5,[[5,5,[5,[5,[[null,[415,[4,[5,[5,[4,5,[[[[5,5,[5,[5,[[null,[461,[[5,[5,[415,4,5,[[5,5,[5,[5,[[null,5,[5,[5,5,[5,[5,[[5,[5,[415,[4,[5,[5,[4,[5,[5,[5,5,[[5,[4,[5,[[5,5,[5,[5,[[null,[415,[4,[5,[5,[4,5,[5,5,[[[[[-41.8,[8,[8,[[[[	[[[	
-[[-41,{},[[[[{},{},	[[[{},{},[[false,	[[false,	[[[{},8,[-41.8,[8,[8,[[[[[-20.8,[8,[8,[[1.8,[3,[8,[[[[	[[[	
-[[-418,[8,[[[
-[[-41,{},[[false,	[[false,	[[[{},8,[-41.8,[8,[8,[[[[[-41.8,[8,[8,[[[[	[[[	[[-41.8,[3,[8,[[[[	[[[	
-[[-418,[8,[[[
-[[-41.8,[8,[8,
-[[-41.8,[-41.8,[8,[8,8,[8,[8,[[[[[-41.8,[8,[
-[[-418,[8,[[[[[[-41.8,[8,[8,[[[[	[[[	
-[[-41,{},[[[[{},{},	[[[{},{},[[false,	[[false,	[[[{},8,[-41.8,[8,[8.8,[8,[[[{},{},	[[[{},{},[[false,	[[false,	[[[{},8,	[[[	
-[[-41,{},[[[[{},{},	[[[{},{},[[false,	[[false,	[[-418,[8,[[[
-[[-41.8,[8,[8,
-[[-41.8,[-41.8,[8,[8,[[[[[-41.8,[8,[
-[[-418,[8,[[␍[[[[-41.8,[8,[8,[[[[	[[[	
-[[-41,{},[[[[{},{},	[[[{},{},[[false,	[[false,	[[[{},8,[-41.8,[8,[8,[[[[[-20.8,[8,[8,[[1.8,[3,[8,[[[[	[[[3,[8,[[[[	[[[	
-[[-418,[8,[[[
-[[-41.8,[8,[8,
-[[-41.8,[-41.8,[8,[8,[[[[[-41.8,[8,[
-[[-418,[8,[[[[[[-41.8,[8,[8,[[[[41.8,[8,[8,[[[[	[[[	[[-41.8,[3,[8,[[[[	[[[	
-[[-418,[8,[[[
-[[-41.8,[8,[8,
-[[-41.8,[-41.8,[8,[8,[[[[[-41.8,[8,[
-[[-41,5,[[5,[4,[5,[[5,5,[5,[5,[[null,[415,[4,[5,[5,[4,5,[[[[5,5,[5,[5,[[null,[415,[[5,[5,[415,4,5,[[5,[[[41.8,[8,[8,[[[[	[[[	[[-41.8,[3,[8,[[[[	[[[	
-[[-418,[8,[[[
-[[-41.8,[8,[8,
-[[-41.8,[-41.8,[8,[8,[[[[[-41.8,[8,[
-[[-418,[8,[[[[[[-41.8,[8,[8,[[[[	[[8,[[[[[[-41.8,[8,[8,[[[[41.8,[8,[8,[[[[	[[[	[[-41.8,[3,[8,[[[[	[[[	
-[[-418,[8,[[[
-[[-41.8,[8,[8,
-[[-41.8,[-41.8,[8,[8,[[[[[-41.8,[8,[
-[[-418,[8,[[[[[[-41.8,[8,[8,[[[[	[[[	
-[[-41,{},[[[[{},{},	[[[{},{},[[false,	[[false,	[[[{},8,[-41.8,[8,[8,[[[[[8,[8,[8,
-[[-41.8,[-41.8,[8,[8,[[[[[-41.8,[8,[
-[[-418,[8,[[[[[[-41.8,[8,[8,[[[[	[[[	
-[[-41,{},[[[[{},{},	[[[{},{},[[false,	[[false,	[[[{},8,[-41.8,[8,[8,[[[[[-20.8,[8,[8,[[1.8,[3,[8,[[[[	[[[	
-[[-418,[8,[[[
-[[-41,{},[[false,	[[false,	[[[{},8,[-41.8,[8,[8,[[[[[-41.8,[8,[8,[[[[	[[[	[[-41.8,[3,[8,[[[[	[[[	
-[[-418,[8,[[[
-[[-41.8,[8,[8,
-[[-41.8,[-41.8,[8,[8,[[[[[-41.8,[8,[
-[[-418,[8,[[[[[[-.41.8,[8,[7,[[[[41.8,[8,[8,[[[[	[[[	[[-41.8,[3,[8,[[[[	[[[	
-[[-418,[8,[[[
-[[-41.8,[8,[8,
-[[-41.8,[-41.8,[8,[8,[[5,[5,[[null,5,[1.0e+9, ""[[{},{}:0 -1.0e028 },[[false,	[[false,	[[[{},8,

corpus/24f51518ec22dc1c31e5e5015aebab9a0d2e1102

@@ -1 +0,0 @@
-[[[{ "min":-6.8,  "in":-6.8,  "in": -6, "Umin": -6.8, "m":-6.4,  "max": 1, "mij": -6.8," ": -6.8, "UUaxax": 1, "mij": -6.8," ": -6.8, "UUax":-6.8, "Tin":-6.8, "mUUUax":-6.8, "maxn":-6.8,  "in": -6, "Umin": -6.8, "m":-6.4,  "max": 1, "mij": -6.8," ": -6.8, "UUax":-6.8, "Tin":-6.8, "mUUUax":-6.8, "max": -6.8, "min":-6.8, "mUax":-6.8, "man": -6, "mUmin": -6.8, "mi": -6, "Umx":-6.8, "Tin":-6.8, "mUUUax":-6.8, "maxn":-6.8,  "in": -6, "Umin": -6.8, "m":-6.4,  "max": 1, "mij": -6.8," ": -6.8, "UUax":-6.8, "Tin":-6.8, "mUUUax":-6.8, "max": -6.8, "min":-6.8, "mUax":-6.8, "man": -6, "mUmin": -6.8, "mi": -6, "Umin": -6.8, "m":-6.4,  "max": 1, "mij": -6.8," ": -6.8, "UUaxin": -6, "Umin": -6.8, "m":-6.4,  1,334en":-5e556.8, "n": -6

corpus/2bc95b8d27fbc9fe709331004369df32619f71b8

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corpus/cfe47e75e04fe523bb487a3d7e6f5b8ba79f0a39

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corpus/df25af1851418ad238dbad6e198c1ac21fdae29d

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corpus/e2cd72472db7a72add77089f4e1f91e3c09eb481

@@ -1,101 +0,0 @@
-
-
-
-
-
-
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-[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[
-
-[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[
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-
-[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[
-
-[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[
-
-[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[[false,	[[false,	[[[{},8,[-41.8,[8,[8,[[[[[-20.8,[8,[8,[[1.8,[3,[8,[[[[	[[[	
-[[-418,[8,[[[
-[[-41,{},[[false,	[[[[
-
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-{"":
-
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-5
-
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-,[8,
-[[-41.8,[-41.8,[8,[8,
-
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-[[[[[false,	[[f[
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-4
-"p{ },[
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-
-][-41,[-[

corpus/fd0196a47f62da65deeb051fb555afce1b34996b

@@ -1 +0,0 @@
-"de39\ud83dLudœ8

corpus/ff148842785b21e0bf5e28c2880c6d57c2194ec2

@@ -1,62 +0,0 @@
-[[[{},{},	[[[{},{},[[[[{},{},	[[[{},{},[[false,	[[false,	[[[{},8,[-41.8,[8,[8,[[[[[-41.8,[8,[8,[[[[	[[[	[[-41.8,[3,[8,[[[[	[[[	
-[[-418,[8,[[[
-[[-41.8,[8,[8,
-[[-41.8,[-41.8,[8,[8,[[[[[-41.8,[8,[
-[[-418,[8,[[[[[[-41.8,[8,[8,[[[[	[[[	
-[[-41,{},[[[[{},{},	[[[{},{},[[false,	[[false,	[[[{},8,[-41.8,[8,[8,[[[[[-20.8,[8,[8,[[1.8,[3,[8,[[[[	[[[	
-[[-418,[8,[[[
-[[-41,{},[[false,	[[false,	[[[{},8,[-41.8,[8,[8,[[[[[-41.8,[8,[8,[[[[	[[[	[[-41.8,[3,[8,[[[[	[[[	
-[[-418,[8,[[[
-[[-41.8,[8,[8,
-[[-41.8,[-41.8,[8,[8,[[[[[-41.8,[8,[
-[[-418,[8,[[[[[[-41.8,[8,[7,[[[[41.8,[8,[8,[[[[	[[[	[[-41.8,[3,[8,[[[[	[[[	
-[[-418,[8,[[[
-[[-41.8,[8,[8,
-[[-41.8,[-41.8,[8,[8,[[[[[-41.8,[8,[
-[[-418,[8,[[[[[[-41.8,[8,[8,[[[[	[[[	
-[[-41,{},[[[[{},{},	[[[{},{},[[false,	[[false,	[[[{},8,[-41.8,[8,[8,[[[[[-20.8,[8,[8,[[1.8,[3,[8,[[[[	[[[	
-[[-418,[8,[[[
-
-
--41,{},[[false,	[[false,	[[[{},8,[-41.8,[8,[8,[[[[[-41.8,[8,[8,[[[[	[[[	[[-41.8,[3,[8,[[[[	[[[	
-[[-418,[8,[[[
-[[-41.8,[8,[8,
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-[[-41,{},[[[[{},{},	[[[{},{},[[false,	[[false,	[[[{},8,[-41.8,[8,[8.8,[8,[[[{},{},	[[[{},{},[[false,	[[false,	[[[{},8,	[[[	
-[[-41,{},[[[[{},{},	[[[{},{},[[false,	[[false,	[[-418,[8,[[[
-[[-41.8,[8,[8,␍9777E-1,[-41.8,[8,[8,[[[[[-41.8,[8,[
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-[[-41.8,[-41.8,[8,[8,[[[[[-41.8,[8,[
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-[[-41,{},[[[8,[8,[[[[[{},{},	[[[{},{},[[false,	[[false,	[[[{},8,[-41.8,[8,[8,[[[[[-20.8,[8,[8,[[1.8,[3,[8,[[[[	[[[	
-[[-418,[8,[[[
-[[-41,{},[[false,	[[false,	[[[{},8,[-41.8,[8,[8,[[[[[-41.8,[8,[8,[[[[	[[[	[[-41.8,[3,[8,[[[[	[[[	
-[[-418,[8,[[[
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-[[-418,[8,[[[
-[[-41.8,[8,[8,
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-[[-41,{},[[[[{},{},	[[[{},{},[[false,	[[false,	"ffa2ffa\udafa\udffad@faa\udff41.8,[8,[8,[[[
-[8{},[-[

include/weaseljson.h

@@ -38,8 +38,6 @@ enum WeaselJsonStatus {
   WeaselJson_REJECT,
   /** json is too deeply nested */
   WeaselJson_OVERFLOW,
-  /** Tried to call parse on a null parser */
-  WeaselJson_NULL,
 };
 
 typedef struct WeaselJsonParser WeaselJsonParser;
@@ -67,7 +65,7 @@ void WeaselJsonParser_destroy(WeaselJsonParser *parser);
 /** Incrementally parse `len` more bytes starting at `buf`. `buf` may be
  * modified. Call with `len` 0 to indicate end of data. `buf` may be null if
  * `len` is 0. `len` must not be negative; a negative length is treated as a
- * rejected input. Returns WeaselJson_NULL if parser is null */
+ * rejected input. */
 WeaselJsonStatus WeaselJsonParser_parse(WeaselJsonParser *parser, char *buf,
                                         int len);
 

src/json_value.h

@@ -1,7 +1,6 @@
 #pragma once
 
 #include <cstddef>
-#include <cstdint>
 #include <map>
 #include <memory>
 #include <optional>

src/lib.cpp

@@ -29,26 +29,17 @@ WeaselJsonParser_create(int stackSize, const WeaselJsonCallbacks *callbacks,
 
 __attribute__((visibility("default"))) void
 WeaselJsonParser_reset(WeaselJsonParser *parser) {
-  if (parser == nullptr) {
-    return;
-  }
   ((Parser3 *)parser)->reset();
 }
 
 __attribute__((visibility("default"))) void
 WeaselJsonParser_destroy(WeaselJsonParser *parser) {
-  if (parser == nullptr) {
-    return;
-  }
   ((Parser3 *)parser)->~Parser3();
   free(parser);
 }
 
 __attribute__((visibility("default"))) WeaselJsonStatus
 WeaselJsonParser_parse(WeaselJsonParser *parser, char *buf, int len) {
-  if (parser == nullptr) [[unlikely]] {
-    return WeaselJson_NULL;
-  }
   return ((Parser3 *)parser)->parse(buf, len);
 }
 }

src/parser3.h

@@ -139,7 +139,7 @@ struct Parser3 {
     stackPtr = stack();
     std::ignore = push({N_VALUE, N_WHITESPACE, T_EOF});
     inKey = false;
-    terminalStatus = WeaselJson_OK;
+    rejected = false;
     utf8Codepoint = 0;
     utf16Surrogate = 0;
     minCodepoint = 0;
@@ -162,7 +162,7 @@ struct Parser3 {
   NumDfa numDfa;
   Utf8Dfa strDfa;
   bool inKey = false;
-  WeaselJsonStatus terminalStatus = WeaselJson_OK;
+  bool rejected = false;
 
 #ifndef HAS_MUSTTAIL
   char *stashBufForTrampoline;
@@ -625,7 +625,7 @@ inline PRESERVE_NONE ContinuationStatus n_string2(Parser3 *self, char *buf,
           return WeaselJson_REJECT;
         }
         buf += 4;
-        if (0xd800 <= codepoint && codepoint <= 0xdbff) {
+        if (0xd800 <= codepoint && codepoint <= 0xdfff) {
           // utf-16 surrogate
           int32_t codepoint2 = read4_hex(buf + 2);
           if (!(buf[0] == '\\' && buf[1] == 'u' && 0xdc00 <= codepoint2 &&
@@ -650,8 +650,6 @@ inline PRESERVE_NONE ContinuationStatus n_string2(Parser3 *self, char *buf,
             self->writeBuf[0] = (0b00000111 & codepoint) | 0b11110000;
             self->writeBuf += 4;
           }
-        } else if (0xdc00 <= codepoint && codepoint <= 0xdfff) [[unlikely]] {
-          return WeaselJson_REJECT;
         } else {
           if (!(self->flags & WeaselJsonRaw)) {
             if (codepoint < 0x80) {
@@ -795,7 +793,7 @@ inline PRESERVE_NONE ContinuationStatus t_hex2(Parser3 *self, char *buf,
     }
   } else {
     assert(self->utf8Codepoint < 0x10000);
-    if (0xd800 <= self->utf8Codepoint && self->utf8Codepoint <= 0xdbff) {
+    if (0xd800 <= self->utf8Codepoint && self->utf8Codepoint <= 0xdfff) {
       // utf-16 surrogate
       self->utf16Surrogate = self->utf8Codepoint;
       self->utf8Codepoint = 0;
@@ -810,10 +808,6 @@ inline PRESERVE_NONE ContinuationStatus t_hex2(Parser3 *self, char *buf,
       }
       MUSTTAIL return Parser3::keepGoing(self, buf, bufEnd);
     }
-    if (0xdc00 <= self->utf8Codepoint && self->utf8Codepoint <= 0xdfff)
-        [[unlikely]] {
-      return WeaselJson_REJECT;
-    }
     if (!(self->flags & WeaselJsonRaw)) {
       bool useTmp = buf - self->writeBuf < 3;
       char *p = tmp;
@@ -1070,12 +1064,12 @@ constexpr inline struct ContinuationTable {
 inline WeaselJsonStatus Parser3::parse(char *buf, int len) {
   this->dataBegin = this->writeBuf = buf;
 
-  if (this->terminalStatus != WeaselJson_OK) [[unlikely]] {
+  if (this->rejected) [[unlikely]] {
-    return this->terminalStatus;
+    return WeaselJson_REJECT;
   }
 
   if (len < 0) [[unlikely]] {
-    this->terminalStatus = WeaselJson_REJECT;
+    this->rejected = true;
     return WeaselJson_REJECT;
   }
 
@@ -1085,8 +1079,8 @@ inline WeaselJsonStatus Parser3::parse(char *buf, int len) {
   // range.
   ContinuationStatus status =
       symbolTables.continuations[top()](this, buf, buf + len);
-  if (status > WeaselJson_AGAIN) {
+  if (status == WeaselJson_REJECT) {
-    this->terminalStatus = WeaselJsonStatus(status);
+    this->rejected = true;
   }
   return WeaselJsonStatus(status);
 #else
@@ -1095,8 +1089,8 @@ inline WeaselJsonStatus Parser3::parse(char *buf, int len) {
   while ((result = symbolTables.continuations[top()](
               this, stashBufForTrampoline, buf + len)) == kBounce)
     ;
-  if (result > WeaselJson_AGAIN) {
+  if (result == WeaselJson_REJECT) {
-    this->terminalStatus = WeaselJsonStatus(result);
+    this->rejected = true;
   }
   return WeaselJsonStatus(result);
 #endif

src/test.cpp

@@ -202,62 +202,6 @@ TEST_CASE("parser3") {
   }
 }
 
-TEST_CASE("overflow state is sticky") {
-  auto c = noopCallbacks();
-  // stackSize 3 is exactly big enough to hold reset()'s bootstrap, but too
-  // small for nested arrays. Overflows must be terminal like rejects: a later
-  // end-of-data call must never report OK for an incomplete document.
-  auto *parser = WeaselJsonParser_create(3, &c, nullptr, 0);
-  REQUIRE(parser != nullptr);
-
-  std::string doc = "[[";
-  REQUIRE(WeaselJsonParser_parse(parser, doc.data(), doc.size()) ==
-          WeaselJson_OVERFLOW);
-
-  // After overflow, the end-of-data call must not return OK.
-  REQUIRE(WeaselJsonParser_parse(parser, nullptr, 0) != WeaselJson_OK);
-  // It should keep reporting a terminal failure.
-  REQUIRE(WeaselJsonParser_parse(parser, nullptr, 0) != WeaselJson_OK);
-
-  // Further data chunks must also stay terminal.
-  std::string more = "]]";
-  REQUIRE(WeaselJsonParser_parse(parser, more.data(), more.size()) !=
-          WeaselJson_OK);
-
-  WeaselJsonParser_destroy(parser);
-}
-
-TEST_CASE("overflow is sticky for nested objects") {
-  auto c = noopCallbacks();
-  auto *parser = WeaselJsonParser_create(4, &c, nullptr, 0);
-  REQUIRE(parser != nullptr);
-
-  std::string doc = "{\"a\":{ \"a\":";
-  REQUIRE(WeaselJsonParser_parse(parser, doc.data(), doc.size()) ==
-          WeaselJson_OVERFLOW);
-  REQUIRE(WeaselJsonParser_parse(parser, nullptr, 0) != WeaselJson_OK);
-
-  WeaselJsonParser_destroy(parser);
-}
-
-TEST_CASE("reset clears overflow state") {
-  auto c = noopCallbacks();
-  auto *parser = WeaselJsonParser_create(3, &c, nullptr, 0);
-  REQUIRE(parser != nullptr);
-
-  std::string doc = "[[";
-  REQUIRE(WeaselJsonParser_parse(parser, doc.data(), doc.size()) ==
-          WeaselJson_OVERFLOW);
-  // After reset the parser should accept a minimal document again.
-  WeaselJsonParser_reset(parser);
-  std::string copy = "1";
-  REQUIRE(WeaselJsonParser_parse(parser, copy.data(), copy.size()) ==
-          WeaselJson_AGAIN);
-  REQUIRE(WeaselJsonParser_parse(parser, nullptr, 0) == WeaselJson_OK);
-
-  WeaselJsonParser_destroy(parser);
-}
-
 TEST_CASE("rejected state is sticky") {
   auto c = noopCallbacks();
   auto *parser = WeaselJsonParser_create(1024, &c, nullptr, 0);
@@ -302,20 +246,6 @@ TEST_CASE("create rejects too-small stack") {
   WeaselJsonParser_destroy(parser);
 }
 
-TEST_CASE("reset and destroy accept null parser") {
-  // Creation can legitimately fail and return null. The cleanup functions must
-  // tolerate a null pointer the same way free(nullptr) is a no-op.
-  auto c = noopCallbacks();
-  WeaselJsonParser *parser = WeaselJsonParser_create(-1, &c, nullptr, 0);
-  REQUIRE(parser == nullptr);
-  WeaselJsonParser_reset(parser);   // must not crash
-  WeaselJsonParser_destroy(parser); // must not crash
-
-  // Calling reset/destroy on literal nullptr directly must also be safe.
-  WeaselJsonParser_reset(nullptr);
-  WeaselJsonParser_destroy(nullptr);
-}
-
 TEST_CASE("parse rejects negative length") {
   auto c = noopCallbacks();
   auto *parser = WeaselJsonParser_create(1024, &c, nullptr, 0);
@@ -330,10 +260,6 @@ TEST_CASE("parse rejects negative length") {
   WeaselJsonParser_destroy(parser);
 }
 
-TEST_CASE("Calling parse with nullptr doesn't crash") {
-  REQUIRE(WeaselJsonParser_parse(nullptr, nullptr, 0) == WeaselJson_NULL);
-}
-
 TEST_CASE("streaming") { testStreaming(json); }
 
 TEST_CASE("reset clears inKey and transient state") {

src/validate.cpp

@@ -33,9 +33,6 @@ int main(int argc, char **argv) {
     case WeaselJson_REJECT:
     case WeaselJson_OVERFLOW:
       return 1;
-    case WeaselJson_NULL:
-      fprintf(stderr, "parse called with a null parser\n");
-      return 1;
     }
     if (l == 0) {
       return 1;

test_python_bindings.py

@@ -95,20 +95,8 @@ def test_create_rejects_too_small_stack():
         raise AssertionError(f"expected ValueError for stackSize={stack_size}")
 
 
-def test_missing_library_raises_oserror():
-    try:
-        weaseljson.WeaselJsonParser(
-            weaseljson.WeaselJsonCallbacksBase(),
-            build_dir="/nonexistent",
-        )
-    except OSError:
-        return
-    raise AssertionError("expected OSError when the shared library is missing")
-
-
 if __name__ == "__main__":
     test_object_keys_routed_correctly()
     test_mixed_values()
     test_create_rejects_too_small_stack()
-    test_missing_library_raises_oserror()
     print("python bindings ok")

weaseljson.py

@@ -30,7 +30,6 @@ class WeaselJsonStatus(enum.Enum):
     AGAIN = 1
     REJECT = 2
     OVERFLOW = 3
-    NULL = 4
 
 
 class WeaselJsonCallbacksBase:
@@ -85,7 +84,13 @@ class WeaselJsonParser:
                 pass
 
         if self._lib is None:
-            raise OSError(f"Could not load libweaseljson from {build_dir}")
+            import sys
+
+            print(
+                "Could not find libweaseljson implementation",
+                file=sys.stderr,
+            )
+            sys.exit(1)
 
         self._lib.WeaselJsonParser_create.argtypes = (
             ctypes.c_int,