mirror of
https://github.com/vlang/v.git
synced 2023-08-10 21:13:21 +03:00
479 lines
10 KiB
V
479 lines
10 KiB
V
// Copyright (c) 2019-2022 Alexander Medvednikov. All rights reserved.
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// Use of this source code is governed by an MIT license
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// that can be found in the LICENSE file.
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module json2
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import strings
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import time
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// Decodes a JSON string into an `Any` type. Returns an option.
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pub fn raw_decode(src string) !Any {
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mut p := new_parser(src, true)
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return p.decode()
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}
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// Same with `raw_decode`, but skips the type conversion for certain types when decoding a certain value.
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pub fn fast_raw_decode(src string) !Any {
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mut p := new_parser(src, false)
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return p.decode()
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}
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// decode is a generic function that decodes a JSON string into the target type.
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pub fn decode[T](src string) !T {
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mut typ := T{}
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res := raw_decode(src)!.as_map()
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$if T is $struct {
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$for field in T.fields {
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mut json_name := field.name
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for attr in field.attrs {
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if attr.contains('json: ') {
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json_name = attr.replace('json: ', '')
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break
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}
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}
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$if field.is_enum {
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typ.$(field.name) = if key := res[field.name] {
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key.int()
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} else {
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res[json_name]!.int()
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}
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} $else $if field.typ is u8 {
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typ.$(field.name) = res[json_name]!.u64()
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} $else $if field.typ is u16 {
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typ.$(field.name) = res[json_name]!.u64()
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} $else $if field.typ is u32 {
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typ.$(field.name) = res[json_name]!.u64()
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} $else $if field.typ is u64 {
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typ.$(field.name) = res[json_name]!.u64()
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} $else $if field.typ is int {
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typ.$(field.name) = res[json_name]!.int()
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} $else $if field.typ is i8 {
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typ.$(field.name) = res[json_name]!.int()
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} $else $if field.typ is i16 {
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typ.$(field.name) = res[json_name]!.int()
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} $else $if field.typ is i32 {
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typ.$(field.name) = i32(res[field.name]!.int())
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} $else $if field.typ is i64 {
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typ.$(field.name) = res[json_name]!.i64()
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} $else $if field.typ is ?u8 {
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if json_name in res {
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typ.$(field.name) = ?u8(res[json_name]!.i64())
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}
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} $else $if field.typ is ?i8 {
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if json_name in res {
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typ.$(field.name) = ?i8(res[json_name]!.i64())
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}
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} $else $if field.typ is ?u16 {
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if json_name in res {
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typ.$(field.name) = ?u16(res[json_name]!.i64())
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}
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} $else $if field.typ is ?i16 {
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if json_name in res {
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typ.$(field.name) = ?i16(res[json_name]!.i64())
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}
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} $else $if field.typ is ?u32 {
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if json_name in res {
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typ.$(field.name) = ?u32(res[json_name]!.i64())
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}
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} $else $if field.typ is ?i32 {
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if json_name in res {
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typ.$(field.name) = ?i32(res[json_name]!.i64())
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}
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} $else $if field.typ is ?u64 {
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if json_name in res {
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typ.$(field.name) = ?u64(res[json_name]!.i64())
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}
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} $else $if field.typ is ?i64 {
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if json_name in res {
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typ.$(field.name) = ?i64(res[json_name]!.i64())
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}
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} $else $if field.typ is ?int {
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if json_name in res {
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typ.$(field.name) = ?int(res[json_name]!.i64())
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}
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} $else $if field.typ is f32 {
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typ.$(field.name) = res[json_name]!.f32()
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} $else $if field.typ is ?f32 {
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if json_name in res {
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typ.$(field.name) = res[json_name]!.f32()
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}
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} $else $if field.typ is f64 {
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typ.$(field.name) = res[json_name]!.f64()
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} $else $if field.typ is ?f64 {
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if json_name in res {
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typ.$(field.name) = res[json_name]!.f64()
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}
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} $else $if field.typ is bool {
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typ.$(field.name) = res[json_name]!.bool()
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} $else $if field.typ is ?bool {
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if json_name in res {
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typ.$(field.name) = res[json_name]!.bool()
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}
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} $else $if field.typ is string {
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typ.$(field.name) = res[json_name]!.str()
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} $else $if field.typ is ?string {
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if json_name in res {
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typ.$(field.name) = res[json_name]!.str()
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}
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} $else $if field.typ is time.Time {
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typ.$(field.name) = res[field.name]!.to_time()!
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} $else $if field.typ is ?time.Time {
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if json_name in res {
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typ.$(field.name) = res[field.name]!.to_time()!
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}
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} $else $if field.is_array {
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// typ.$(field.name) = res[field.name]!.arr()
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} $else $if field.is_struct {
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} $else $if field.is_alias {
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} $else $if field.is_map {
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} $else {
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return error("The type of `${field.name}` can't be decoded. Please open an issue at https://github.com/vlang/v/issues/new/choose")
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}
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}
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} $else $if T is $map {
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for k, v in res {
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// // TODO - make this work to decode types like `map[string]StructType[bool]`
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// $if typeof(typ[k]).idx is string {
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// typ[k] = v.str()
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// } $else $if typeof(typ[k]).idx is $struct {
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// }
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match v {
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string {
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typ[k] = v.str()
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}
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else {}
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}
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}
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}
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return typ
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}
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// encode is a generic function that encodes a type into a JSON string.
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pub fn encode[T](val T) string {
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$if T is $array {
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$compile_error('Cannot use `json.encode` to encode array. Try `json.encode_array` instead')
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}
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mut sb := strings.new_builder(64)
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defer {
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unsafe { sb.free() }
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}
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default_encoder.encode_value(val, mut sb) or {
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dump(err)
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default_encoder.encode_value[Null](null, mut sb) or {}
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}
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return sb.str()
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}
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// encode_array is a generic function that encodes a array into a JSON string.
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pub fn encode_array[T](val []T) string {
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mut sb := strings.new_builder(64)
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defer {
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unsafe { sb.free() }
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}
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default_encoder.encode_array(val, 1, mut sb) or {
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dump(err)
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default_encoder.encode_value[Null](null, mut sb) or {}
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}
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return sb.str()
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}
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// encode_pretty ...
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pub fn encode_pretty[T](typed_data T) string {
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encoded := encode(typed_data)
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raw_decoded := raw_decode(encoded) or { 0 }
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return raw_decoded.prettify_json_str()
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}
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// i8 - TODO
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pub fn (f Any) i8() i8 {
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match f {
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i8 {
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return f
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}
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i16, int, i64, u8, u16, u32, u64, f32, f64, bool {
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return i8(f)
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}
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string {
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return f.i8()
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}
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else {
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return 0
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}
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}
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}
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// i16 - TODO
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pub fn (f Any) i16() i16 {
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match f {
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i16 {
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return f
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}
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i8, int, i64, u8, u16, u32, u64, f32, f64, bool {
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return i16(f)
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}
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string {
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return f.i16()
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}
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else {
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return 0
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}
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}
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}
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// int uses `Any` as an integer.
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pub fn (f Any) int() int {
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match f {
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int {
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return f
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}
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i8, i16, i64, u8, u16, u32, u64, f32, f64, bool {
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return int(f)
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}
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string {
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return f.int()
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}
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else {
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return 0
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}
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}
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}
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// i64 uses `Any` as a 64-bit integer.
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pub fn (f Any) i64() i64 {
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match f {
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i64 {
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return f
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}
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i8, i16, int, u8, u16, u32, u64, f32, f64, bool {
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return i64(f)
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}
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string {
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return f.i64()
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}
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else {
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return 0
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}
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}
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}
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// u64 uses `Any` as a 64-bit unsigned integer.
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pub fn (f Any) u64() u64 {
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match f {
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u64 {
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return f
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}
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u8, u16, u32, i8, i16, int, i64, f32, f64, bool {
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return u64(f)
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}
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string {
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return f.u64()
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}
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else {
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return 0
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}
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}
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}
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// f32 uses `Any` as a 32-bit float.
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pub fn (f Any) f32() f32 {
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match f {
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f32 {
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return f
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}
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bool, i8, i16, int, i64, u8, u16, u32, u64, f64 {
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return f32(f)
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}
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string {
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return f.f32()
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}
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else {
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return 0.0
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}
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}
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}
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// f64 uses `Any` as a 64-bit float.
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pub fn (f Any) f64() f64 {
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match f {
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f64 {
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return f
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}
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i8, i16, int, i64, u8, u16, u32, u64, f32 {
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return f64(f)
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}
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string {
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return f.f64()
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}
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else {
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return 0.0
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}
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}
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}
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// bool uses `Any` as a bool.
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pub fn (f Any) bool() bool {
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match f {
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bool {
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return f
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}
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string {
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if f == 'false' {
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return false
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}
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if f == 'true' {
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return true
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}
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if f.len > 0 {
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return f != '0' && f != '0.0'
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} else {
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return false
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}
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}
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i8, i16, int, i64 {
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return i64(f) != 0
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}
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u8, u16, u32, u64 {
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return u64(f) != 0
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}
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f32, f64 {
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return f64(f) != 0.0
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}
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else {
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return false
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}
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}
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}
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// arr uses `Any` as an array.
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pub fn (f Any) arr() []Any {
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if f is []Any {
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return f
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} else if f is map[string]Any {
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mut arr := []Any{}
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for _, v in f {
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arr << v
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}
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return arr
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}
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return [f]
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}
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// as_map uses `Any` as a map.
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pub fn (f Any) as_map() map[string]Any {
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if f is map[string]Any {
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return f
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} else if f is []Any {
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mut mp := map[string]Any{}
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for i, fi in f {
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mp['${i}'] = fi
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}
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return mp
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}
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return {
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'0': f
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}
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}
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// to_time uses `Any` as a time.Time.
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pub fn (f Any) to_time() !time.Time {
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match f {
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time.Time {
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return f
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}
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i64 {
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return time.unix(f)
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}
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string {
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if f.len == 10 && f[4] == `-` && f[7] == `-` {
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// just a date in the format `2001-01-01`
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return time.parse_iso8601(f)!
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}
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is_rfc3339 := f.len == 24 && f[23] == `Z` && f[10] == `T`
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if is_rfc3339 {
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return time.parse_rfc3339(f)!
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}
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mut is_unix_timestamp := true
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for c in f {
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if c == `-` || (c >= `0` && c <= `9`) {
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continue
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}
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is_unix_timestamp = false
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break
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}
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if is_unix_timestamp {
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return time.unix(f.i64())
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}
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// TODO - parse_iso8601
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// TODO - parse_rfc2822
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return time.parse(f)!
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}
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else {
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return error('not a time value: ${f} of type: ${f.type_name()}')
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}
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}
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}
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fn map_from[T](t T) map[string]Any {
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mut m := map[string]Any{}
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$if T is $struct {
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$for field in T.fields {
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value := t.$(field.name)
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$if field.is_array {
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mut arr := []Any{}
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for variable in value {
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arr << Any(variable)
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}
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m[field.name] = arr
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arr.clear()
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} $else $if field.is_struct {
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m[field.name] = map_from(value)
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} $else $if field.is_map {
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// TODO
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} $else $if field.is_alias {
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// TODO
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} $else $if field.is_option {
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// TODO
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} $else {
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// TODO improve memory usage when convert
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$if field.typ is string {
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m[field.name] = value.str()
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} $else $if field.typ is bool {
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m[field.name] = t.$(field.name).str().bool()
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} $else $if field.typ is i8 {
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m[field.name] = t.$(field.name).str().i8()
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} $else $if field.typ is i16 {
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m[field.name] = t.$(field.name).str().i16()
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} $else $if field.typ is int {
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m[field.name] = t.$(field.name).str().int()
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} $else $if field.typ is i64 {
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m[field.name] = t.$(field.name).str().i64()
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} $else $if field.typ is f32 {
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m[field.name] = t.$(field.name).str().f32()
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} $else $if field.typ is f64 {
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m[field.name] = t.$(field.name).str().f64()
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} $else $if field.typ is u8 {
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m[field.name] = t.$(field.name).str().u8()
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} $else $if field.typ is u16 {
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m[field.name] = t.$(field.name).str().u16()
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} $else $if field.typ is u32 {
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m[field.name] = t.$(field.name).str().u32()
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} $else $if field.typ is u64 {
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m[field.name] = t.$(field.name).str().u64()
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} $else {
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// return error("The type of `${field.name}` can't be decoded. Please open an issue at https://github.com/vlang/v/issues/new/choose")
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}
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}
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}
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}
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return m
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}
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