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package flags
import "base:runtime"
import "core:fmt"
import "core:mem"
import "core:reflect"
import "core:strconv"
import "core:strings"
import "core:unicode/utf8"
_, _, _, _, _, _, _ :: runtime, fmt, mem, reflect, strconv, strings, utf8
@(private)
parse_and_set_pointer_by_type :: proc(ptr: rawptr, value: string, ti: ^runtime.Type_Info) -> bool {
set_bool :: proc(ptr: rawptr, $T: typeid, str: string) -> bool {
(^T)(ptr)^ = (T)(strconv.parse_bool(str) or_return)
return true
}
set_i128 :: proc(ptr: rawptr, $T: typeid, str: string) -> bool {
value := strconv.parse_i128(str) or_return
if value > cast(i128)max(T) || value < cast(i128)min(T) {
return false
}
(^T)(ptr)^ = (T)(value)
return true
}
set_u128 :: proc(ptr: rawptr, $T: typeid, str: string) -> bool {
value := strconv.parse_u128(str) or_return
if value > cast(u128)max(T) {
return false
}
(^T)(ptr)^ = (T)(value)
return true
}
set_f64 :: proc(ptr: rawptr, $T: typeid, str: string) -> bool {
(^T)(ptr)^ = (T)(strconv.parse_f64(str) or_return)
return true
}
a := any{ptr, ti.id}
#partial switch t in ti.variant {
case runtime.Type_Info_Dynamic_Array:
ptr := (^runtime.Raw_Dynamic_Array)(ptr)
// Try to convert the value first.
elem_backing, mem_err := mem.alloc_bytes(t.elem.size, t.elem.align)
if mem_err != nil {
return false
}
defer delete(elem_backing)
parse_and_set_pointer_by_type(raw_data(elem_backing), value, t.elem) or_return
runtime.__dynamic_array_resize(ptr, t.elem.size, t.elem.align, ptr.len + 1) or_return
subptr := cast(rawptr)(uintptr(ptr.data) + uintptr((ptr.len - 1) * t.elem.size))
mem.copy(subptr, raw_data(elem_backing), len(elem_backing))
case runtime.Type_Info_Boolean:
switch b in a {
case bool: set_bool(ptr, bool, value) or_return
case b8: set_bool(ptr, b8, value) or_return
case b16: set_bool(ptr, b16, value) or_return
case b32: set_bool(ptr, b32, value) or_return
case b64: set_bool(ptr, b64, value) or_return
}
case runtime.Type_Info_Rune:
r := utf8.rune_at_pos(value, 0)
if r == utf8.RUNE_ERROR { return false }
(^rune)(ptr)^ = r
case runtime.Type_Info_String:
switch s in a {
case string: (^string)(ptr)^ = value
case cstring: (^cstring)(ptr)^ = strings.clone_to_cstring(value)
}
case runtime.Type_Info_Integer:
switch i in a {
case int: set_i128(ptr, int, value) or_return
case i8: set_i128(ptr, i8, value) or_return
case i16: set_i128(ptr, i16, value) or_return
case i32: set_i128(ptr, i32, value) or_return
case i64: set_i128(ptr, i64, value) or_return
case i128: set_i128(ptr, i128, value) or_return
case i16le: set_i128(ptr, i16le, value) or_return
case i32le: set_i128(ptr, i32le, value) or_return
case i64le: set_i128(ptr, i64le, value) or_return
case i128le: set_i128(ptr, i128le, value) or_return
case i16be: set_i128(ptr, i16be, value) or_return
case i32be: set_i128(ptr, i32be, value) or_return
case i64be: set_i128(ptr, i64be, value) or_return
case i128be: set_i128(ptr, i128be, value) or_return
case uint: set_u128(ptr, uint, value) or_return
case uintptr: set_u128(ptr, uintptr, value) or_return
case u8: set_u128(ptr, u8, value) or_return
case u16: set_u128(ptr, u16, value) or_return
case u32: set_u128(ptr, u32, value) or_return
case u64: set_u128(ptr, u64, value) or_return
case u128: set_u128(ptr, u128, value) or_return
case u16le: set_u128(ptr, u16le, value) or_return
case u32le: set_u128(ptr, u32le, value) or_return
case u64le: set_u128(ptr, u64le, value) or_return
case u128le: set_u128(ptr, u128le, value) or_return
case u16be: set_u128(ptr, u16be, value) or_return
case u32be: set_u128(ptr, u32be, value) or_return
case u64be: set_u128(ptr, u64be, value) or_return
case u128be: set_u128(ptr, u128be, value) or_return
}
case runtime.Type_Info_Float:
switch f in a {
case f16: set_f64(ptr, f16, value) or_return
case f32: set_f64(ptr, f32, value) or_return
case f64: set_f64(ptr, f64, value) or_return
case f16le: set_f64(ptr, f16le, value) or_return
case f32le: set_f64(ptr, f32le, value) or_return
case f64le: set_f64(ptr, f64le, value) or_return
case f16be: set_f64(ptr, f16be, value) or_return
case f32be: set_f64(ptr, f32be, value) or_return
case f64be: set_f64(ptr, f64be, value) or_return
}
case:
return false
}
return true
}
@(private)
get_struct_subtag :: proc(tag, id: string) -> (value: string, ok: bool) {
tag := tag
for subtag in strings.split_iterator(&tag, ",") {
if equals := strings.index_byte(subtag, '='); equals != -1 && id == subtag[:equals] {
return subtag[1 + equals:], true
} else if id == subtag {
return "", true
}
}
return "", false
}
@(private)
get_field_name :: proc(field: reflect.Struct_Field) -> string {
if args_tag, ok := reflect.struct_tag_lookup(field.tag, TAG_FLAGS); ok {
if name_subtag, name_ok := get_struct_subtag(args_tag, SUBTAG_NAME); name_ok {
return name_subtag
}
}
return field.name
}
// Get a struct field by its field name or "name" subtag.
// NOTE: `Error` uses the `context.temp_allocator` to give context about the error message
get_field_by_name :: proc(data: ^$T, name: string) -> (field: reflect.Struct_Field, err: Error) {
for field in reflect.struct_fields_zipped(T) {
if get_field_name(field) == name {
return field, nil
}
}
return {}, Parse_Error {
.Missing_Field,
fmt.tprintf("unable to find argument by name `%s`", name),
}
}
// Get a struct field by its "pos" subtag.
get_field_by_pos :: proc(data: ^$T, index: int) -> (field: reflect.Struct_Field, ok: bool) {
fields := reflect.struct_fields_zipped(T)
for field in fields {
args_tag := reflect.struct_tag_lookup(field.tag, TAG_FLAGS) or_continue
pos_subtag := get_struct_subtag(args_tag, SUBTAG_POS) or_continue
value := strconv.parse_int(pos_subtag) or_continue
if value == index {
return field, true
}
}
return {}, false
}
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