mirror of
https://github.com/vlang/v.git
synced 2023-08-10 21:13:21 +03:00
489 lines
14 KiB
V
489 lines
14 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 io
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import strings
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import time
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// Encoder encodes the an `Any` type into JSON representation.
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// It provides parameters in order to change the end result.
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pub struct Encoder {
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newline u8
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newline_spaces_count int
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escape_unicode bool = true
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}
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pub const default_encoder = Encoder{}
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// byte array versions of the most common tokens/chars to avoid reallocations
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const null_in_bytes = 'null'.bytes()
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const true_in_bytes = 'true'.bytes()
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const false_in_bytes = 'false'.bytes()
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const zero_in_bytes = [u8(`0`)]
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const comma_bytes = [u8(`,`)]
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const colon_bytes = [u8(`:`)]
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const space_bytes = [u8(` `)]
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const unicode_escape_chars = [u8(`\\`), `u`]
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const quote_bytes = [u8(`"`)]
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const escaped_chars = [(r'\b').bytes(), (r'\f').bytes(), (r'\n').bytes(),
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(r'\r').bytes(), (r'\t').bytes()]
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// encode_value encodes a value to the specific writer.
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pub fn (e &Encoder) encode_value[T](val T, mut wr io.Writer) ! {
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e.encode_value_with_level[T](val, 1, mut wr)!
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}
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fn (e &Encoder) encode_newline(level int, mut wr io.Writer) ! {
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if e.newline != 0 {
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wr.write([e.newline])!
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for j := 0; j < level * e.newline_spaces_count; j++ {
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wr.write(json2.space_bytes)!
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}
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}
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}
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fn (e &Encoder) encode_any(val Any, level int, mut wr io.Writer) ! {
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match val {
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string {
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e.encode_string(val, mut wr)!
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}
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bool {
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if val == true {
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wr.write(json2.true_in_bytes)!
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} else {
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wr.write(json2.false_in_bytes)!
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}
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}
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i8, i16, int, i64 {
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wr.write(val.str().bytes())!
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}
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u8, u16, u32, u64 {
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wr.write(val.str().bytes())!
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}
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f32, f64 {
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$if !nofloat ? {
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str_float := val.str().bytes()
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wr.write(str_float)!
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if str_float[str_float.len - 1] == `.` {
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wr.write(json2.zero_in_bytes)!
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}
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return
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}
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wr.write(json2.zero_in_bytes)!
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}
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map[string]Any {
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wr.write([u8(`{`)])!
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mut i := 0
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for k, v in val {
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e.encode_newline(level, mut wr)!
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e.encode_string(k, mut wr)!
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wr.write(json2.colon_bytes)!
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if e.newline != 0 {
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wr.write(json2.space_bytes)!
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}
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e.encode_value_with_level(v, level + 1, mut wr)!
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if i < val.len - 1 {
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wr.write(json2.comma_bytes)!
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}
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i++
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}
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e.encode_newline(level - 1, mut wr)!
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wr.write([u8(`}`)])!
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}
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[]Any {
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wr.write([u8(`[`)])!
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for i in 0 .. val.len {
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e.encode_newline(level, mut wr)!
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e.encode_value_with_level(val[i], level + 1, mut wr)!
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if i < val.len - 1 {
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wr.write(json2.comma_bytes)!
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}
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}
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e.encode_newline(level - 1, mut wr)!
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wr.write([u8(`]`)])!
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}
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time.Time {}
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Null {
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wr.write(json2.null_in_bytes)!
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}
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}
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}
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fn (e &Encoder) encode_value_with_level[T](val T, level int, mut wr io.Writer) ! {
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$if T is string {
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e.encode_string(val, mut wr)!
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} $else $if T is Any {
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e.encode_any(val, level, mut wr)!
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} $else $if T is map[string]Any {
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// weird quirk but val is destructured immediately to Any
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e.encode_any(val, level, mut wr)!
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} $else $if T is []Any {
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e.encode_any(val, level, mut wr)!
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} $else $if T in [Null, bool, $Float, $Int] {
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e.encode_any(val, level, mut wr)!
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} $else $if T is Encodable {
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wr.write(val.json_str().bytes())!
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} $else $if T is $Struct {
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e.encode_struct(val, level, mut wr)!
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} $else $if T is $Enum {
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e.encode_any(Any(int(val)), level, mut wr)!
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} $else {
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// dump(val.str())
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return error('cannot encode value with ${typeof(val).name} type')
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}
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}
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fn (e &Encoder) encode_struct[U](val U, level int, mut wr io.Writer) ! {
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wr.write([u8(`{`)])!
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mut i := 0
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mut fields_len := 0
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$for field in U.fields {
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if val.$(field.name).str() != 'Option(error: none)' {
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fields_len++
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}
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}
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$for field in U.fields {
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value := val.$(field.name)
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mut json_name := ''
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for attr in field.attrs {
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if attr.contains('json: ') {
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json_name = attr.replace('json: ', '')
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break
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}
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}
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$if field.is_option {
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is_none := value.str() == 'Option(error: none)'
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if !is_none {
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e.encode_newline(level, mut wr)!
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if json_name != '' {
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e.encode_string(json_name, mut wr)!
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} else {
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e.encode_string(field.name, mut wr)!
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}
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wr.write(json2.colon_bytes)!
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if e.newline != 0 {
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wr.write(json2.space_bytes)!
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}
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$if field.typ is ?string {
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e.encode_string(val.$(field.name) ?.str()#[8..-2], mut wr)!
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} $else $if field.typ is ?bool || field.typ is ?f32 || field.typ is ?f64
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|| field.typ is ?i8 || field.typ is ?i16 || field.typ is ?int
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|| field.typ is ?i64 || field.typ is ?u8 || field.typ is ?u16
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|| field.typ is ?u32 || field.typ is ?u64 {
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wr.write(val.$(field.name) ?.str()#[7..-1].bytes())!
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} $else $if field.typ is ?time.Time {
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option_value := val.$(field.name) as ?time.Time
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parsed_time := option_value as time.Time
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e.encode_string(parsed_time.format_rfc3339(), mut wr)!
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} $else $if field.is_array {
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e.encode_array(value, level + 1, mut wr)!
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} $else $if field.is_struct {
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e.encode_struct(value, level + 1, mut wr)!
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} $else $if field.is_enum {
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// FIXME - checker and cast error
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// wr.write(int(val.$(field.name)?).str().bytes())!
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return error('type ${typeof(val).name} cannot be encoded yet')
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} $else $if field.is_alias {
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match field.unaliased_typ {
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typeof[string]().idx {
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e.encode_string(value.str(), mut wr)!
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}
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typeof[bool]().idx, typeof[f32]().idx, typeof[f64]().idx, typeof[i8]().idx,
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typeof[i16]().idx, typeof[int]().idx, typeof[i64]().idx, typeof[u8]().idx,
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typeof[u16]().idx, typeof[u32]().idx, typeof[u64]().idx {
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wr.write(value.str().bytes())!
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}
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typeof[[]byte]().idx, typeof[[]int]().idx {
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// FIXME - error: could not infer generic type `U` in call to `encode_array`
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// e.encode_array(value, level, mut wr)!
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}
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else {
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// e.encode_value_with_level(value, level + 1, mut wr)!
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}
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}
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} $else {
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return error('type ${typeof(val).name} cannot be array encoded')
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}
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}
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} $else {
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e.encode_newline(level, mut wr)!
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if json_name != '' {
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e.encode_string(json_name, mut wr)!
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} else {
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e.encode_string(field.name, mut wr)!
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}
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wr.write(json2.colon_bytes)!
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if e.newline != 0 {
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wr.write(json2.space_bytes)!
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}
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$if field.typ is string {
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e.encode_string(val.$(field.name).str(), mut wr)!
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} $else $if field.typ is time.Time {
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parsed_time := val.$(field.name) as time.Time
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e.encode_string(parsed_time.format_rfc3339(), mut wr)!
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} $else $if field.typ in [bool, $Float, $Int] {
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wr.write(val.$(field.name).str().bytes())!
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} $else $if field.is_array {
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// TODO - replace for `field.typ is $Array`
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e.encode_array(value, level + 1, mut wr)!
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} $else $if field.typ is $Array {
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// e.encode_array(value, level + 1, mut wr)! // FIXME - error: could not infer generic type `U` in call to `encode_array`
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} $else $if field.typ is $Struct {
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e.encode_struct(value, level + 1, mut wr)!
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} $else $if field.is_enum {
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// TODO - replace for `field.typ is $Enum`
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wr.write(int(val.$(field.name)).str().bytes())!
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} $else $if field.typ is $Enum {
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// wr.write(int(val.$(field.name)).str().bytes())! // FIXME - error: cannot cast string to `int`, use `val.$field.name.int()` instead.
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} $else $if field.typ is $Sumtype {
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// // FIXME - error: cannot match `bool` with `string`
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// match value {
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// string {
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// println(val.$(field.name))
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// }
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// bool {
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// }
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// i8, i16, int, i64 {
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// }
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// u8, u16, u32, u64 {
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// }
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// f32, f64 {
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// }
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// map[string]Any {
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// }
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// []Any {
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// }
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// time.Time {}
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// Null {
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// } else {
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// dump("elsa")
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// }
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// }
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} $else $if field.typ is $Alias {
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$if field.unaliased_typ is string {
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e.encode_string(val.$(field.name).str(), mut wr)!
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} $else $if field.unaliased_typ is time.Time {
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parsed_time := val.$(field.name) as time.Time
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e.encode_string(parsed_time.format_rfc3339(), mut wr)!
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} $else $if field.unaliased_typ in [bool, $Float, $Int] {
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wr.write(val.$(field.name).str().bytes())!
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} $else $if field.unaliased_typ is $Array {
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// e.encode_array(val.$(field.name), level + 1, mut wr)! // FIXME - error: could not infer generic type `U` in call to `encode_array`
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} $else $if field.unaliased_typ is $Struct {
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// e.encode_struct(val.$(field.name), level + 1, mut wr)! // FIXME - error: cannot use `BoolAlias` as `StringAlias` in argument 1 to `x.json2.Encoder.encode_struct`
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e.encode_struct(value, level + 1, mut wr)!
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} $else $if field.unaliased_typ is $Enum {
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// enum_value := val.$(field.name)
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// dump(int(val.$(field.name))) // FIXME
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// dump(val.$(field.name).int()) // FIXME - error: unknown method or field: `BoolAlias.int`
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// dump(val.$(field.name).int()) // FIXME - error: cannot convert 'enum <anonymous>' to 'struct string'
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// wr.write(val.$(field.name).int().str().bytes())! // FIXME - error: unknown method or field: `BoolAlias.int`
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} $else $if field.unaliased_typ is $Sumtype {
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} $else {
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return error('the alias ${typeof(val).name} cannot be encoded')
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}
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} $else {
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return error('type ${typeof(val).name} cannot be array encoded')
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}
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}
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if i < fields_len - 1 {
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wr.write(json2.comma_bytes)!
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}
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i++
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}
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e.encode_newline(level - 1, mut wr)!
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wr.write([u8(`}`)])!
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}
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fn (e &Encoder) encode_array[U](val []U, level int, mut wr io.Writer) ! {
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wr.write([u8(`[`)])!
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for i in 0 .. val.len {
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e.encode_newline(level, mut wr)!
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$if U is string {
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e.encode_any(val[i], level + 1, mut wr)!
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} $else $if U is bool {
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e.encode_any(bool(val[i]), level + 1, mut wr)!
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} $else $if U is f32 {
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e.encode_any(f32(val[i]), level + 1, mut wr)!
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} $else $if U is f64 {
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e.encode_any(f64(val[i]), level + 1, mut wr)!
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} $else $if U is i8 {
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e.encode_any(i8(val[i]), level + 1, mut wr)!
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} $else $if U is i16 {
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e.encode_any(i16(val[i]), level + 1, mut wr)!
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} $else $if U is int {
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e.encode_any(int(val[i]), level + 1, mut wr)!
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} $else $if U is i64 {
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e.encode_any(i64(val[i]), level + 1, mut wr)!
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} $else $if U is u8 {
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e.encode_any(u8(val[i]), level + 1, mut wr)!
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} $else $if U is byte {
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e.encode_any(u8(val[i]), level + 1, mut wr)!
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} $else $if U is u16 {
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e.encode_any(u16(val[i]), level + 1, mut wr)!
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} $else $if U is u32 {
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e.encode_any(u32(val[i]), level + 1, mut wr)!
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} $else $if U is u64 {
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e.encode_any(u64(val[i]), level + 1, mut wr)!
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} $else $if U is $Array {
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// FIXME - error: could not infer generic type `U` in call to `encode_array`
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// e.encode_array(val[i], level + 1, mut wr)!
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} $else $if U is $Struct {
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e.encode_struct(val[i], level + 1, mut wr)!
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} $else $if U is $Enum {
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e.encode_any(i64(val[i]), level + 1, mut wr)!
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} $else {
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return error('type ${typeof(val).name} cannot be array encoded')
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}
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if i < val.len - 1 {
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wr.write(json2.comma_bytes)!
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}
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}
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e.encode_newline(level - 1, mut wr)!
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wr.write([u8(`]`)])!
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}
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// str returns the JSON string representation of the `map[string]Any` type.
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pub fn (f map[string]Any) str() string {
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return Any(f).json_str()
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}
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// str returns the JSON string representation of the `[]Any` type.
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pub fn (f []Any) str() string {
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return Any(f).json_str()
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}
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// str returns the string representation of the `Any` type. Use the `json_str` method
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// if you want to use the escaped str() version of the `Any` type.
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pub fn (f Any) str() string {
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if f is string {
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return f
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} else {
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return f.json_str()
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}
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}
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// json_str returns the JSON string representation of the `Any` type.
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[manualfree]
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pub fn (f Any) json_str() string {
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return encode(f)
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}
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// prettify_json_str returns the pretty-formatted JSON string representation of the `Any` type.
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[manualfree]
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pub fn (f Any) prettify_json_str() string {
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mut sb := strings.new_builder(4096)
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defer {
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unsafe { sb.free() }
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}
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mut enc := Encoder{
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newline: `\n`
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newline_spaces_count: 2
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}
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enc.encode_value(f, mut sb) or {}
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return sb.str()
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}
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// CharLengthIterator is an iterator that generates a char
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// length value of every iteration based on the given text.
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// (e.g.: "t✔" => [t => 1, ✔ => 2])
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struct CharLengthIterator {
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text string
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mut:
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idx int
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}
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fn (mut iter CharLengthIterator) next() ?int {
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if iter.idx >= iter.text.len {
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return none
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}
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defer {
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iter.idx++
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}
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mut len := 1
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c := iter.text[iter.idx]
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if (c & (1 << 7)) != 0 {
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for t := u8(1 << 6); (c & t) != 0; t >>= 1 {
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len++
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iter.idx++
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}
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}
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return len
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}
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// encode_string returns the JSON spec-compliant version of the string.
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[manualfree]
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fn (e &Encoder) encode_string(s string, mut wr io.Writer) ! {
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mut char_lens := CharLengthIterator{
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text: s
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}
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mut i := 0
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wr.write(json2.quote_bytes)!
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for char_len in char_lens {
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if char_len == 1 {
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chr := s[i]
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if chr in important_escapable_chars {
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for j := 0; j < important_escapable_chars.len; j++ {
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if chr == important_escapable_chars[j] {
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wr.write(json2.escaped_chars[j])!
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break
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}
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}
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} else if chr == `"` || chr == `/` || chr == `\\` {
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wr.write([u8(`\\`), chr])!
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} else if int(chr) < 0x20 {
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hex_code := chr.hex().bytes()
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wr.write(json2.unicode_escape_chars)! // \u
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wr.write(json2.zero_in_bytes)! // \u0
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wr.write(json2.zero_in_bytes)! // \u00
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wr.write(hex_code)! // \u00xxxx
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} else {
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wr.write([u8(chr)])!
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}
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} else {
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slice := s[i..i + char_len]
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hex_code := slice.utf32_code().hex().bytes()
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if !e.escape_unicode || hex_code.len < 4 {
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// unescaped non-ASCII char
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wr.write(slice.bytes())!
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|
} else if hex_code.len == 4 {
|
|
// a unicode endpoint
|
|
wr.write(json2.unicode_escape_chars)!
|
|
wr.write(hex_code)!
|
|
} else {
|
|
// TODO: still figuring out what
|
|
// to do with more than 4 chars
|
|
wr.write(json2.space_bytes)!
|
|
}
|
|
unsafe {
|
|
slice.free()
|
|
hex_code.free()
|
|
}
|
|
}
|
|
i += char_len
|
|
}
|
|
|
|
wr.write(json2.quote_bytes)!
|
|
}
|