121 lines
3.9 KiB
V
121 lines
3.9 KiB
V
module encoder
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import time
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// example see https://github.com/vlang/v/blob/master/examples/compiletime/reflection.v
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pub fn encode[T](obj T) ![]u8 {
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mut d := new()
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// compile-time `for` loop
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// T.fields gives an array of a field metadata type
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$for field in T.fields {
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// Primitive types
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$if field.typ is string {
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// $(string_expr) produces an identifier
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d.add_string(obj.$(field.name).str())
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} $else $if field.typ is bool {
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d.add_bool(bool(obj.$(field.name)))
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} $else $if field.typ is int {
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d.add_int(int(obj.$(field.name)))
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} $else $if field.typ is u8 {
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d.add_u8(u8(obj.$(field.name)))
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} $else $if field.typ is u16 {
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d.add_u16(u16(obj.$(field.name)))
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} $else $if field.typ is u32 {
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d.add_u32(u32(obj.$(field.name)))
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} $else $if field.typ is u64 {
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d.add_u64(u64(obj.$(field.name)))
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}$else $if field.typ is i64 {
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d.add_i64(i64(obj.$(field.name)))
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} $else $if field.typ is time.Time {
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d.add_time(time.new(obj.$(field.name)))
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// Arrays of primitive types
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} $else $if field.typ is []string {
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// d.add_list_string(obj.$(field.name)) why error??
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d.add_list_string(obj.$(field.name)[..])
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} $else $if field.typ is []int {
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d.add_list_int(obj.$(field.name)[..])
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} $else $if field.typ is []u8 {
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d.add_list_u8(obj.$(field.name)[..])
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} $else $if field.typ is []u16 {
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d.add_list_u16(obj.$(field.name)[..])
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} $else $if field.typ is []u32 {
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d.add_list_u32(obj.$(field.name)[..])
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} $else $if field.typ is []u64 {
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d.add_list_u64(obj.$(field.name)[..])
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// Maps of primitive types
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} $else $if field.typ is map[string]string {
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d.add_map_string(obj.$(field.name).clone())
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} $else $if field.typ is map[string][]u8 {
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d.add_map_bytes(obj.$(field.name).clone())
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// Structs
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} $else $if field.is_struct {
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e := encode(obj.$(field.name))!
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d.add_list_u8(e)
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} $else {
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typ_name := typeof(obj.$(field.name)).name
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return error("The type `${typ_name}` of field `${field.name}` can't be encoded")
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}
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}
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return d.data
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}
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pub fn decode[T](data []u8) !T {
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mut d := decoder_new(data)
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mut result := T{}
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// compile-time `for` loop
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// T.fields gives an array of a field metadata type
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$for field in T.fields {
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// console.print_debug(field.name)
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// console.print_debug(typeof(result.$(field.name)).name)
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// console.print_debug(result.$(field.name))
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// Primitive types
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$if field.typ is string {
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// $(string_expr) produces an identifier
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result.$(field.name) = d.get_string()!
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} $else $if field.typ is bool {
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result.$(field.name) = d.get_bool()!
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} $else $if field.typ is int {
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result.$(field.name) = d.get_int()!
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} $else $if field.typ is u8 {
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result.$(field.name) = d.get_u8()!
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} $else $if field.typ is u16 {
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result.$(field.name) = d.get_u16()!
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} $else $if field.typ is u32 {
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result.$(field.name) = d.get_u32()!
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} $else $if field.typ is u64 {
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result.$(field.name) = d.get_u64()!
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} $else $if field.typ is time.Time {
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result.$(field.name) = d.get_time()!
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// Arrays of primitive types
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} $else $if field.typ is []string {
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result.$(field.name) = d.get_list_string()!
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} $else $if field.typ is []int {
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result.$(field.name) = d.get_list_int()!
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} $else $if field.typ is []u8 {
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result.$(field.name) = d.get_list_u8()!
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} $else $if field.typ is []u16 {
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result.$(field.name) = d.get_list_u16()!
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} $else $if field.typ is []u32 {
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result.$(field.name) = d.get_list_u32()!
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} $else $if field.typ is []u64 {
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result.$(field.name) = d.get_list_u64()!
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// Maps of primitive types
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} $else $if field.typ is map[string]string {
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result.$(field.name) = d.get_map_string()!
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} $else $if field.typ is map[string][]u8 {
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result.$(field.name) = d.get_map_bytes()!
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// Structs
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} $else $if field.is_struct {
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// TODO handle recursive behavior
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} $else {
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typ_name := typeof(result.$(field.name)).name
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return error("The type `${typ_name}` of field `${field.name}` can't be decoded")
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}
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}
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return result
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}
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// TODO: complete, the recursive behavior will be little tricky
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