Adds most of the toolsHEADmaster

1 files changed, 175 insertions, 0 deletions

diff --git a/v_windows/v/old/vlib/x/json2/README.md b/v_windows/v/old/vlib/x/json2/README.md
new file mode 100644
index 0000000..fcefbff
--- /dev/null
+++ b/v_windows/v/old/vlib/x/json2/README.md
@@ -0,0 +1,175 @@
+> The name `json2` was chosen to avoid any unwanted potential conflicts with the
+> existing codegen tailored for the main `json` module which is powered by CJSON.
+
+`x.json2` is an experimental JSON parser written from scratch on V.
+
+## Usage
+```v oksyntax
+import x.json2
+import net.http
+
+fn main() {
+	// Decoding
+	resp := http.get('https://example.com') ?
+
+	// raw decode
+	raw_person := json2.raw_decode(resp.text) ?
+
+	// Casting `Any` type / Navigating
+	person := raw_person.as_map()
+	name := person['name'].str() // Bob
+	age := person['age'].int() // 19
+	pi := person['pi'].f64() // 3.14....
+
+	// Constructing an `Any` type
+	mut me := map[string]json2.Any{}
+	me['name'] = 'Bob'
+	me['age'] = 18
+
+	mut arr := []json2.Any{}
+	arr << 'rock'
+	arr << 'papers'
+	arr << json2.null
+	arr << 12
+
+	me['interests'] = arr
+
+	mut pets := map[string]json2.Any{}
+	pets['Sam'] = 'Maltese Shitzu'
+	me['pets'] = pets
+
+	// Stringify to JSON
+	println(me.str())
+	//{
+	//   "name":"Bob",
+	//   "age":18,
+	//   "interests":["rock","papers","scissors",null,12],
+	//   "pets":{"Sam":"Maltese"}
+	//}
+
+	// Encode a struct/type to JSON
+	encoded_json := json2.encode<Person>(person2)
+}
+```
+## Using `decode<T>` and `encode<T>`
+> Codegen for this feature is still WIP.
+> You need to manually define the methods before using the module to structs.
+
+In order to use the `decode<T>` and `encode<T>` function, you need to explicitly define
+two methods: `from_json` and `to_json`. `from_json` accepts a `json2.Any` argument
+and inside of it you need to map the fields you're going to put into the type.
+As for `to_json` method, you just need to map the values into `json2.Any`
+and turn it into a string.
+
+```v ignore
+struct Person {
+mut:
+    name string
+    age  int = 20
+    pets []string
+}
+
+fn (mut p Person) from_json(f json2.Any) {
+    obj := f.as_map()
+    for k, v in obj {
+        match k {
+            'name' { p.name = v.str() }
+            'age' { p.age = v.int() }
+            'pets' { p.pets = v.arr().map(it.str()) }
+            else {}
+        }
+    }
+}
+
+fn (p Person) to_json() string {
+    mut obj := map[string]json2.Any
+    obj['name'] = p.name
+    obj['age'] = p.age
+    obj['pets'] = p.pets
+    return obj.str()
+}
+
+fn main() {
+    resp := os.read_file('./person.json')?
+    person := json2.decode<Person>(resp)?
+    println(person) // Person{name: 'Bob', age: 28, pets: ['Floof']}
+    person_json := json2.encode<Person>(person)
+    println(person_json) // {"name": "Bob", "age": 28, "pets": ["Floof"]}
+}
+```
+
+## Using struct tags
+`x.json2` can access and use the struct field tags similar to the
+`json` module by using the comp-time `$for` for structs.
+
+```v ignore
+fn (mut p Person) from_json(f json2.Any) {
+    mp := an.as_map()
+	mut js_field_name := ''
+    $for field in Person.fields {
+        js_field_name = field.name
+
+        for attr in field.attrs {
+			if attr.starts_with('json:') {
+				js_field_name = attr.all_after('json:').trim_left(' ')
+				break
+			}
+		}
+
+        match field.name {
+            'name' { p.name = mp[js_field_name].str() }
+			'age' { u.age = mp[js_field_name].int() }
+			'pets' { u.pets = mp[js_field_name].arr().map(it.str()) }
+			else {}
+		}
+    }
+}
+```
+
+### Null Values
+`x.json2` has a separate `null` type for differentiating an undefined value and a null value.
+To verify that the field you're accessing is a `null`, use `<typ> is json2.Null`.
+
+```v ignore
+fn (mut p Person) from_json(f json2.Any) {
+    obj := f.as_map()
+    if obj['age'] is json2.Null {
+        // use a default value
+        p.age = 10
+    }
+}
+```
+
+### Custom field names
+Aside from using struct tags, you can also just simply cast the base field into a map (`as_map()`)
+and access the field you wish to put into the struct/type.
+
+```v ignore
+fn (mut p Person) from_json(f json2.Any) {
+    obj := f.as_map()
+    p.name = obj['nickname'].str()
+}
+```
+
+```v oksyntax
+fn (mut p Person) to_json() string {
+	obj := f.as_map()
+	obj['nickname'] = p.name
+	return obj.str()
+}
+```
+
+### Undefined Values
+Getting undefined values has the same behavior as regular V types.
+If you're casting a base field into `map[string]json2.Any` and fetch an undefined entry/value,
+it simply returns empty. As for the `[]json2.Any`, it returns an index error.
+
+## Casting a value to an incompatible type
+`x.json2` provides methods for turning `Any` types into usable types.
+The following list shows the possible outputs when casting a value to an incompatible type.
+
+1. Casting non-array values as array (`arr()`) will return an array with the value as the content.
+2. Casting non-map values as map (`as_map()`) will return a map with the value as the content.
+3. Casting non-string values to string (`str()`) will return the
+JSON string representation of the value.
+4. Casting non-numeric values to int/float (`int()`/`i64()`/`f32()`/`f64()`) will return zero.