v/vlib/x/json2/json2.v

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2020-09-10 12:05:40 +02:00
// Copyright (c) 2019-2020 Alexander Medvednikov. All rights reserved.
// Use of this source code is governed by an MIT license
// that can be found in the LICENSE file.
module json2
pub interface Serializable {
from_json(f Any)
to_json() string
}
// Decodes a JSON string into an `Any` type. Returns an option.
pub fn raw_decode(src string) ?Any {
mut p := new_parser(src)
p.detect_parse_mode()
if p.mode == .invalid {
return error(p.emit_error('Invalid JSON.'))
}
fi := p.decode_value() or {
return error(p.emit_error(err))
}
if p.tok.kind != .eof {
return error(p.emit_error('Unknown token `$p.tok.kind`.'))
}
return fi
}
// A generic function that decodes a JSON string into the target type.
//
// TODO: decode must return an optional generics
pub fn decode<T>(src string) T {
res := raw_decode(src) or {
panic(err)
}
mut typ := T{}
typ.from_json(res)
return typ
}
// A generic function that encodes a type into a JSON string.
pub fn encode<T>(typ T) string {
return typ.to_json()
}
// A simple function that returns `Null` struct. For use on constructing an `Any` object.
pub fn null() Null {
return Null{}
}
// Use `Any` as a map.
pub fn (f Any) as_map() map[string]Any {
mut mp := map[string]Any
match f {
map[string]Any {
return *f
}
string {
mp['0'] = f
return mp
}
int {
mp['0'] = f
return mp
}
bool {
mp['0'] = f
return mp
}
f64 {
mp['0'] = f
return mp
}
Null {
mp['0'] = f
return mp
}
else {
if typeof(f) == 'array_Any' {
arr := f as []Any
for i, fi in arr {
mp[i.str()] = fi
}
return mp
}
return mp
}
}
}
// Use `Any` as an integer.
pub fn (f Any) int() int {
match f {
int { return *f }
f64 { return f.str().int() }
else { return 0 }
}
}
// Use `Any` as a float.
pub fn (f Any) f64() f64 {
match f {
int { return *f }
f64 { return *f }
else { return 0.0 }
}
}
// Use `Any` as an array.
pub fn (f Any) arr() []Any {
if f is []Any {
return *f
}
if f is map[string]Any {
mut arr := []Any{}
mp := *f
for _, v in mp {
arr << v
}
return arr
}
return [f]
}
// Use `Any` as a bool
pub fn (f Any) bool() bool {
match f {
bool { return *f }
string { return (*f).bool() }
else { return false }
}
}