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### jsoncons::jsonschema::make_json_schema
```cpp
#include <jsoncons_ext/jsonschema/jsonschema.hpp>
template <typename Json>
json_schema<Json> make_json_schema(const Json& sch, (until 0.175.0)
evaluation_options options = evaluation_options{});
(1)
template <typename Json>
json_schema<Json> make_json_schema(Json sch, (since 0.175.0)
evaluation_options options = evaluation_options{});
template <typename Json,typename SchemaResolver>
json_schema<Json> make_json_schema(const Json& sch, (until 0.175.0)
const SchemaResolver& resolver,
evaluation_options options = evaluation_options{}); (2)
template <typename Json,typename SchemaResolver>
json_schema<Json> make_json_schema(Json sch, (since 0.175.0)
const SchemaResolver& resolver,
evaluation_options options = evaluation_options{});
template <typename Json>
json_schema<Json> make_json_schema(const Json& sch, (until 0.175.0)
const std::string& retrieval_uri,
evaluation_options options = evaluation_options{});
(3)
template <typename Json>
json_schema<Json> make_json_schema(Json sch, (since 0.175.0)
const std::string& retrieval_uri,
evaluation_options options = evaluation_options{});
template <typename Json,typename SchemaResolver>
json_schema<Json> make_json_schema(const Json& sch, (until 0.175.0)
const std::string& retrieval_uri,
const SchemaResolver& resolver,
evaluation_options options = evaluation_options{});
(4)
template <typename Json,typename SchemaResolver>
json_schema<Json> make_json_schema(Json sch, (since 0.175.0)
const std::string& retrieval_uri,
const SchemaResolver& resolver,
evaluation_options options = evaluation_options{});
```
Returns a [json_schema<Json>](json_schema.md) that represents a compiled JSON Schema document.
#### Parameters
<table>
<tr>
<td>schema</td>
<td>JSON Schema</td>
</tr>
<tr>
<td>resolver</td>
<td>A function object with the signature of <code>resolver</code> being equivalent to
<pre>
Json fun(const <a href="../corelib/utility/uri.md">jsoncons::uri</a>& uri);</pre>
If unable to resolve the resource, it should return <code>Json::null()</code>.
</td>
</tr>
<tr>
<td>retrieval_uri</td>
<td>Optional retrieval URI</td>
</tr>
<tr>
<td><a href="evaluation_options.md">options</a></td>
<td>Evaluation options</td>
</tr>
</table>
#### Return value
A [json_schema<Json>](json_schema.md) that represents a compiled JSON Schema document.
#### Exceptions
(1)-(4) Throws a [schema_error](schema_error.md) if JSON Schema compilation fails.
### Examples
#### Draft 2020-12 example (from the JSON Schema Test Suite)
```cpp
#include <jsoncons/json.hpp>
#include <jsoncons_ext/jsonschema/jsonschema.hpp>
#include <iostream>
using jsoncons::json;
namespace jsonschema = jsoncons::jsonschema;
int main()
{
json schema = json::parse(R"(
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"$id": "https://test.json-schema.org/typical-dynamic-resolution/root",
"$ref": "list",
"$defs": {
"foo": {
"$dynamicAnchor": "items",
"type": "string"
},
"list": {
"$id": "list",
"type": "array",
"items": { "$dynamicRef": "#items" },
"$defs": {
"items": {
"$comment": "This is only needed to satisfy the bookending requirement",
"$dynamicAnchor": "items"
}
}
}
}
}
)");
jsonschema::json_schema<json> compiled = jsonschema::make_json_schema(schema);
json data = json::parse(R"(["foo", 42])");
jsoncons::json_decoder<ojson> decoder;
compiled.validate(data, decoder);
ojson output = decoder.get_result();
std::cout << pretty_print(output) << "\n\n";
}
```
Output:
```json
[
{
"valid": false,
"evaluationPath": "/$ref/items/$dynamicRef/type",
"schemaLocation": "https://test.json-schema.org/typical-dynamic-resolution/root#items",
"instanceLocation": "/1",
"error": "Expected string, found integer"
}
]
```
#### Draft 2019-09 example (from the JSON Schema Test Suite)
```cpp
#include <jsoncons/json.hpp>
#include <jsoncons_ext/jsonschema/jsonschema.hpp>
#include <iostream>
using jsoncons::json;
namespace jsonschema = jsoncons::jsonschema;
int main()
{
json schema = json::parse(R"(
{
"$schema": "https://json-schema.org/draft/2019-09/schema",
"type": "object",
"properties": {
"foo": { "type": "string" }
},
"allOf": [
{
"properties": {
"bar": { "type": "string" }
}
}
],
"unevaluatedProperties": false
}
)");
jsonschema::json_schema<json> compiled = jsonschema::make_json_schema(schema);
json data = json::parse(R"({"foo": "foo","bar": "bar","baz": "baz"})");
jsoncons::json_decoder<ojson> decoder;
compiled.validate(data, decoder);
ojson output = decoder.get_result();
std::cout << pretty_print(output) << "\n\n";
}
```
Output:
```json
[
{
"valid": false,
"evaluationPath": "/unevaluatedProperties/baz",
"schemaLocation": "#",
"instanceLocation": "/baz",
"error": "Unevaluated property 'baz' but the schema does not allow unevaluated properties."
}
]
```
#### Draft 07 example (from the JSON Schema Test Suite)
```cpp
#include <jsoncons/json.hpp>
#include <jsoncons_ext/jsonschema/jsonschema.hpp>
#include <iostream>
using jsoncons::json;
namespace jsonschema = jsoncons::jsonschema;
int main()
{
json schema = json::parse(R"(
{
"items": [{}],
"additionalItems": {"type": "integer"}
}
)");
// Need to supply default version because schema does not have $schema keyword
jsonschema::json_schema<json> compiled = jsonschema::make_json_schema(schema,
jsonschema::evaluation_options{}.default_version(jsonschema::schema_version::draft7()));
json data = json::parse(R"([ null, 2, 3, "foo" ])");
jsoncons::json_decoder<ojson> decoder;
compiled.validate(data, decoder);
ojson output = decoder.get_result();
std::cout << pretty_print(output) << "\n\n";
}
```
Output:
```json
[
{
"valid": false,
"evaluationPath": "/items/type",
"schemaLocation": "#/additionalItems",
"instanceLocation": "/3",
"error": "Expected integer, found string"
}
]
```
#### Cross draft example
```cpp
#include <jsoncons/json.hpp>
#include <jsoncons_ext/jsonschema/jsonschema.hpp>
#include <iostream>
using jsoncons::json;
namespace jsonschema = jsoncons::jsonschema;
int main()
{
json schema = json::parse(R"(
{
"$schema": "https://json-schema.org/draft/2020-12/schema",
"$id": "https://example.com/schema",
"$defs": {
"foo": {
"$schema": "http://json-schema.org/draft-07/schema#",
"$id": "schema/foo",
"definitions" : {
"bar" : {
"type" : "string"
}
}
}
},
"properties" : {
"thing" : {
"$ref" : "schema/foo#/definitions/bar"
}
}
}
)");
jsonschema::json_schema<json> compiled = jsonschema::make_json_schema(schema);
json data = json::parse(R"({"thing" : 10})");
jsoncons::json_decoder<ojson> decoder;
compiled.validate(data, decoder);
ojson output = decoder.get_result();
std::cout << pretty_print(output) << "\n\n";
}
```
Output:
```json
[
{
"valid": false,
"evaluationPath": "/properties/thing/$ref/type",
"schemaLocation": "https://example.com/schema/foo#/definitions/bar",
"instanceLocation": "/thing",
"error": "Expected string, found integer"
}
]
```
|
