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v/vlib/x/json2/json2.v
2023-04-28 16:24:27 +03:00

480 lines
10 KiB
V

// Copyright (c) 2019-2023 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
import strings
import time
// Decodes a JSON string into an `Any` type. Returns an option.
pub fn raw_decode(src string) !Any {
mut p := new_parser(src, true)
return p.decode()
}
// Same with `raw_decode`, but skips the type conversion for certain types when decoding a certain value.
pub fn fast_raw_decode(src string) !Any {
mut p := new_parser(src, false)
return p.decode()
}
// decode is a generic function that decodes a JSON string into the target type.
pub fn decode[T](src string) !T {
mut typ := T{}
res := raw_decode(src)!.as_map()
$if T is $struct {
$for field in T.fields {
mut json_name := field.name
for attr in field.attrs {
if attr.contains('json: ') {
json_name = attr.replace('json: ', '')
break
}
}
$if field.is_enum {
typ.$(field.name) = if key := res[field.name] {
key.int()
} else {
res[json_name]!.int()
}
} $else $if field.typ is u8 {
typ.$(field.name) = res[json_name]!.u64()
} $else $if field.typ is u16 {
typ.$(field.name) = res[json_name]!.u64()
} $else $if field.typ is u32 {
typ.$(field.name) = res[json_name]!.u64()
} $else $if field.typ is u64 {
typ.$(field.name) = res[json_name]!.u64()
} $else $if field.typ is int {
typ.$(field.name) = res[json_name]!.int()
} $else $if field.typ is i8 {
typ.$(field.name) = res[json_name]!.int()
} $else $if field.typ is i16 {
typ.$(field.name) = res[json_name]!.int()
} $else $if field.typ is i32 {
typ.$(field.name) = i32(res[field.name]!.int())
} $else $if field.typ is i64 {
typ.$(field.name) = res[json_name]!.i64()
} $else $if field.typ is ?u8 {
if json_name in res {
typ.$(field.name) = ?u8(res[json_name]!.i64())
}
} $else $if field.typ is ?i8 {
if json_name in res {
typ.$(field.name) = ?i8(res[json_name]!.i64())
}
} $else $if field.typ is ?u16 {
if json_name in res {
typ.$(field.name) = ?u16(res[json_name]!.i64())
}
} $else $if field.typ is ?i16 {
if json_name in res {
typ.$(field.name) = ?i16(res[json_name]!.i64())
}
} $else $if field.typ is ?u32 {
if json_name in res {
typ.$(field.name) = ?u32(res[json_name]!.i64())
}
} $else $if field.typ is ?i32 {
if json_name in res {
typ.$(field.name) = ?i32(res[json_name]!.i64())
}
} $else $if field.typ is ?u64 {
if json_name in res {
typ.$(field.name) = ?u64(res[json_name]!.i64())
}
} $else $if field.typ is ?i64 {
if json_name in res {
typ.$(field.name) = ?i64(res[json_name]!.i64())
}
} $else $if field.typ is ?int {
if json_name in res {
typ.$(field.name) = ?int(res[json_name]!.i64())
}
} $else $if field.typ is f32 {
typ.$(field.name) = res[json_name]!.f32()
} $else $if field.typ is ?f32 {
if json_name in res {
typ.$(field.name) = res[json_name]!.f32()
}
} $else $if field.typ is f64 {
typ.$(field.name) = res[json_name]!.f64()
} $else $if field.typ is ?f64 {
if json_name in res {
typ.$(field.name) = res[json_name]!.f64()
}
} $else $if field.typ is bool {
typ.$(field.name) = res[json_name]!.bool()
} $else $if field.typ is ?bool {
if json_name in res {
typ.$(field.name) = res[json_name]!.bool()
}
} $else $if field.typ is string {
typ.$(field.name) = res[json_name]!.str()
} $else $if field.typ is ?string {
if json_name in res {
typ.$(field.name) = res[json_name]!.str()
}
} $else $if field.typ is time.Time {
typ.$(field.name) = res[field.name]!.to_time()!
} $else $if field.typ is ?time.Time {
if json_name in res {
typ.$(field.name) = res[field.name]!.to_time()!
}
} $else $if field.is_array {
// typ.$(field.name) = res[field.name]!.arr()
} $else $if field.is_struct {
} $else $if field.is_alias {
} $else $if field.is_map {
} $else {
return error("The type of `${field.name}` can't be decoded. Please open an issue at https://github.com/vlang/v/issues/new/choose")
}
}
} $else $if T is $map {
for k, v in res {
// // TODO - make this work to decode types like `map[string]StructType[bool]`
// $if typeof(typ[k]).idx is string {
// typ[k] = v.str()
// } $else $if typeof(typ[k]).idx is $struct {
// }
match v {
string {
typ[k] = v.str()
}
else {}
}
}
}
return typ
}
// encode is a generic function that encodes a type into a JSON string.
pub fn encode[T](val T) string {
$if T is $array {
return encode_array(val)
} $else {
mut sb := strings.new_builder(64)
defer {
unsafe { sb.free() }
}
default_encoder.encode_value(val, mut sb) or {
println(err)
default_encoder.encode_value[Null](null, mut sb) or {}
}
return sb.str()
}
}
// encode_array is a generic function that encodes a array into a JSON string.
fn encode_array[T](val []T) string {
mut sb := strings.new_builder(64)
defer {
unsafe { sb.free() }
}
default_encoder.encode_array(val, 1, mut sb) or {
println(err)
default_encoder.encode_value[Null](null, mut sb) or {}
}
return sb.str()
}
// encode_pretty ...
pub fn encode_pretty[T](typed_data T) string {
encoded := encode(typed_data)
raw_decoded := raw_decode(encoded) or { 0 }
return raw_decoded.prettify_json_str()
}
// i8 - TODO
pub fn (f Any) i8() i8 {
match f {
i8 {
return f
}
i16, int, i64, u8, u16, u32, u64, f32, f64, bool {
return i8(f)
}
string {
return f.i8()
}
else {
return 0
}
}
}
// i16 - TODO
pub fn (f Any) i16() i16 {
match f {
i16 {
return f
}
i8, int, i64, u8, u16, u32, u64, f32, f64, bool {
return i16(f)
}
string {
return f.i16()
}
else {
return 0
}
}
}
// int uses `Any` as an integer.
pub fn (f Any) int() int {
match f {
int {
return f
}
i8, i16, i64, u8, u16, u32, u64, f32, f64, bool {
return int(f)
}
string {
return f.int()
}
else {
return 0
}
}
}
// i64 uses `Any` as a 64-bit integer.
pub fn (f Any) i64() i64 {
match f {
i64 {
return f
}
i8, i16, int, u8, u16, u32, u64, f32, f64, bool {
return i64(f)
}
string {
return f.i64()
}
else {
return 0
}
}
}
// u64 uses `Any` as a 64-bit unsigned integer.
pub fn (f Any) u64() u64 {
match f {
u64 {
return f
}
u8, u16, u32, i8, i16, int, i64, f32, f64, bool {
return u64(f)
}
string {
return f.u64()
}
else {
return 0
}
}
}
// f32 uses `Any` as a 32-bit float.
pub fn (f Any) f32() f32 {
match f {
f32 {
return f
}
bool, i8, i16, int, i64, u8, u16, u32, u64, f64 {
return f32(f)
}
string {
return f.f32()
}
else {
return 0.0
}
}
}
// f64 uses `Any` as a 64-bit float.
pub fn (f Any) f64() f64 {
match f {
f64 {
return f
}
i8, i16, int, i64, u8, u16, u32, u64, f32 {
return f64(f)
}
string {
return f.f64()
}
else {
return 0.0
}
}
}
// bool uses `Any` as a bool.
pub fn (f Any) bool() bool {
match f {
bool {
return f
}
string {
if f == 'false' {
return false
}
if f == 'true' {
return true
}
if f.len > 0 {
return f != '0' && f != '0.0'
} else {
return false
}
}
i8, i16, int, i64 {
return i64(f) != 0
}
u8, u16, u32, u64 {
return u64(f) != 0
}
f32, f64 {
return f64(f) != 0.0
}
else {
return false
}
}
}
// arr uses `Any` as an array.
pub fn (f Any) arr() []Any {
if f is []Any {
return f
} else if f is map[string]Any {
mut arr := []Any{}
for _, v in f {
arr << v
}
return arr
}
return [f]
}
// as_map uses `Any` as a map.
pub fn (f Any) as_map() map[string]Any {
if f is map[string]Any {
return f
} else if f is []Any {
mut mp := map[string]Any{}
for i, fi in f {
mp['${i}'] = fi
}
return mp
}
return {
'0': f
}
}
// to_time uses `Any` as a time.Time.
pub fn (f Any) to_time() !time.Time {
match f {
time.Time {
return f
}
i64 {
return time.unix(f)
}
string {
if f.len == 10 && f[4] == `-` && f[7] == `-` {
// just a date in the format `2001-01-01`
return time.parse_iso8601(f)!
}
is_rfc3339 := f.len == 24 && f[23] == `Z` && f[10] == `T`
if is_rfc3339 {
return time.parse_rfc3339(f)!
}
mut is_unix_timestamp := true
for c in f {
if c == `-` || (c >= `0` && c <= `9`) {
continue
}
is_unix_timestamp = false
break
}
if is_unix_timestamp {
return time.unix(f.i64())
}
// TODO - parse_iso8601
// TODO - parse_rfc2822
return time.parse(f)!
}
else {
return error('not a time value: ${f} of type: ${f.type_name()}')
}
}
}
fn map_from[T](t T) map[string]Any {
mut m := map[string]Any{}
$if T is $struct {
$for field in T.fields {
value := t.$(field.name)
$if field.is_array {
mut arr := []Any{}
for variable in value {
arr << Any(variable)
}
m[field.name] = arr
arr.clear()
} $else $if field.is_struct {
m[field.name] = map_from(value)
} $else $if field.is_map {
// TODO
} $else $if field.is_alias {
// TODO
} $else $if field.is_option {
// TODO
} $else {
// TODO improve memory usage when convert
$if field.typ is string {
m[field.name] = value.str()
} $else $if field.typ is bool {
m[field.name] = t.$(field.name).str().bool()
} $else $if field.typ is i8 {
m[field.name] = t.$(field.name).str().i8()
} $else $if field.typ is i16 {
m[field.name] = t.$(field.name).str().i16()
} $else $if field.typ is int {
m[field.name] = t.$(field.name).str().int()
} $else $if field.typ is i64 {
m[field.name] = t.$(field.name).str().i64()
} $else $if field.typ is f32 {
m[field.name] = t.$(field.name).str().f32()
} $else $if field.typ is f64 {
m[field.name] = t.$(field.name).str().f64()
} $else $if field.typ is u8 {
m[field.name] = t.$(field.name).str().u8()
} $else $if field.typ is u16 {
m[field.name] = t.$(field.name).str().u16()
} $else $if field.typ is u32 {
m[field.name] = t.$(field.name).str().u32()
} $else $if field.typ is u64 {
m[field.name] = t.$(field.name).str().u64()
} $else {
// return error("The type of `${field.name}` can't be decoded. Please open an issue at https://github.com/vlang/v/issues/new/choose")
}
}
}
}
return m
}