weaseljson/contrib/schemagen/test_gen.cpp

// Test harness for the generated example.schema.json parser.
// Feeds input one byte at a time to exercise chunked string/number paths.
#include <cassert>
#include <cstdio>
#include <string>

#include "gen.h"

using namespace weasel_schema;

// Feed `in` one byte at a time. Returns final status.
static WeaselJsonStatus parseStrided(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 int failures = 0;
#define CHECK(cond)                                                            \
  do {                                                                         \
    if (!(cond)) {                                                             \
      printf("FAIL %s:%d: %s\n", __FILE__, __LINE__, #cond);                   \
      ++failures;                                                              \
    }                                                                          \
  } while (0)

static void expectReject(const std::string &json, const char *what) {
  RootBuilder b;
  WeaselJsonStatus s = parseStrided(b, json);
  if (s == WeaselJson_REJECT) {
    printf("ok   reject: %s\n", what);
  } else {
    printf("FAIL expected reject (%s) got status %d for: %s\n", what, s,
           json.c_str());
    ++failures;
  }
}

int main() {
  // ---- happy path, full feature coverage, byte-strided ----
  {
    std::string json = R"({
      "name": "Ada É",
      "age": 36,
      "height": 1.75,
      "active": true,
      "nickname": null,
      "role": "admin",
      "hobbies": ["math", "lace"],
      "address": { "city": "London", "zip": 12345 },
      "friends": [
        { "name": "Bob" },
        { "name": "Cay", "age": 40 }
      ],
      "tree": {
        "value": 1,
        "children": [ { "value": 2 }, { "value": 3 } ],
        "next": { "value": 99 }
      },
      "extra_unknown": { "ignored": [1, 2, {"x": "y"}] }
    })";
    // Root is strict (additionalProperties:false), so "extra_unknown" must
    // make it reject. Verify that, then test a clean version.
    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",
      "age": 36,
      "height": 1.75,
      "active": true,
      "nickname": null,
      "role": "admin",
      "hobbies": ["math", "lace"],
      "address": { "city": "London", "zip": 12345 },
      "friends": [
        { "name": "Bob" },
        { "name": "Cay", "age": 40 }
      ],
      "tree": {
        "value": 1,
        "children": [ { "value": 2 }, { "value": 3 } ],
        "next": { "value": 99 }
      },
      "nullable_hobbies": [null, "math", null, "lace", null],
      "nullable_scores": [null, 10, null, 20, null]
    })";
    RootBuilder b;
    WeaselJsonStatus s = parseStrided(b, json);
    CHECK(s == WeaselJson_OK);
    if (s == WeaselJson_OK) {
      Root r = b.take();
      CHECK(r.name == "Ada \xC3\x89"); // É -> UTF-8
      CHECK(r.age == 36);
      CHECK(r.height > 1.74 && r.height < 1.76);
      CHECK(r.active.has_value() && *r.active == true);
      CHECK(!r.nickname.has_value()); // explicit null
      CHECK(r.role.has_value() && *r.role == Role::admin);
      CHECK(r.hobbies.has_value() && r.hobbies->size() == 2);
      CHECK(r.hobbies && (*r.hobbies)[0] == "math" &&
            (*r.hobbies)[1] == "lace");
      CHECK(r.address.has_value() && r.address->city == "London");
      CHECK(r.address && r.address->zip.has_value() &&
            *r.address->zip == 12345);
      CHECK(r.friends.has_value() && r.friends->size() == 2);
      CHECK(r.friends && (*r.friends)[0].name == "Bob");
      CHECK(r.friends && !(*r.friends)[0].age.has_value());
      CHECK(r.friends && (*r.friends)[1].age.has_value() &&
            *(*r.friends)[1].age == 40);
      CHECK(r.tree.has_value() && r.tree->value == 1);
      CHECK(r.tree && r.tree->children.has_value() &&
            r.tree->children->size() == 2);
      CHECK(r.tree && r.tree->children && (*r.tree->children)[0].value == 2);
      CHECK(r.tree && r.tree->children && (*r.tree->children)[1].value == 3);
      CHECK(r.tree && r.tree->next && r.tree->next->value == 99);
      CHECK(r.nullable_hobbies.has_value() && r.nullable_hobbies->size() == 5);
      CHECK(r.nullable_hobbies && !(*r.nullable_hobbies)[0] &&
            (*r.nullable_hobbies)[1] && *(*r.nullable_hobbies)[1] == "math" &&
            !(*r.nullable_hobbies)[2] && (*r.nullable_hobbies)[3] &&
            *(*r.nullable_hobbies)[3] == "lace" && !(*r.nullable_hobbies)[4]);
      CHECK(r.nullable_scores.has_value() && r.nullable_scores->size() == 5);
      CHECK(r.nullable_scores && !(*r.nullable_scores)[0] &&
            (*r.nullable_scores)[1] && *(*r.nullable_scores)[1] == 10 &&
            !(*r.nullable_scores)[2] && (*r.nullable_scores)[3] &&
            *(*r.nullable_scores)[3] == 20 && !(*r.nullable_scores)[4]);
      printf("ok   happy path (byte-strided)\n");
    }
  }

  // ---- whole-buffer feed (not strided) ----
  {
    std::string json = R"({"name":"x","age":7})";
    RootBuilder b;
    WeaselJsonStatus s = b.feed(json.data(), (int)json.size());
    if (s == WeaselJson_AGAIN)
      s = b.finish();
    CHECK(s == WeaselJson_OK);
    Root r = b.take();
    CHECK(r.name == "x" && r.age == 7);
    CHECK(!r.role.has_value() && !r.hobbies.has_value());
    printf("ok   minimal object\n");
  }

  // ---- integer accepts any number with no fractional part (JSON Schema) ----
  {
    struct {
      const char *json;
      int64_t age;
    } cases[] = {
        {R"({"name":"x","age":4e1})", 40},
        {R"({"name":"x","age":2.0})", 2},
        {R"({"name":"x","age":-1.5e1})", -15},
        {R"({"name":"x","age":0e0})", 0},
    };
    for (auto &c : cases) {
      RootBuilder b;
      WeaselJsonStatus s = parseStrided(b, c.json);
      CHECK(s == WeaselJson_OK);
      if (s == WeaselJson_OK) {
        Root r = b.take();
        CHECK(r.age == c.age);
      }
    }
    printf("ok   integer in exponent/decimal form\n");
  }
  // a fractional or out-of-range value is still rejected for an integer slot
  expectReject(R"({"name":"x","age":2.5e0})", "non-integral exponent form");
  expectReject(R"({"name":"x","age":1e30})", "integer out of int64 range");

  // ---- schema-violation rejections ----
  expectReject(R"({"name":"x"})", "missing required field 'age'");
  expectReject(R"({"name":"x","age":"notnum"})", "wrong type (string for int)");
  expectReject(R"({"name":"x","age":1,"role":"boss"})", "bad enum value");
  expectReject(R"({"name":"x","age":1,"name":"y"})", "duplicate key");
  expectReject(R"({"name":"x","age":1,"active":null})",
               "null for non-nullable");
  expectReject(R"({"name":"x","age":1,"age":2})", "duplicate required key");
  expectReject(R"({"name":"x","age":1.5})", "fractional for integer");
  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) {
    printf("\nALL TESTS PASSED\n");
    return 0;
  }
  printf("\n%d FAILURE(S)\n", failures);
  return 1;
}