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use super::parser;
use convert_case::{Case, Casing};
use proc_macro2::TokenStream;
use quote::{format_ident, quote};
use syn::DeriveInput;
/// Reserved fields
const RESERVED_FIELDS: [&str; 8] = [
"is_deleted",
"is_locked",
"is_archived",
"created_at",
"updated_at",
"deleted_at",
"version",
"edition",
];
/// Parses the token stream for the `Model` trait derivation.
pub(super) fn parse_token_stream(input: DeriveInput) -> TokenStream {
// Model name
let name = input.ident;
// Parsing field attributes
let mut field_constructors = Vec::new();
let mut field_setters = Vec::new();
for field in parser::parse_struct_fields(input.data) {
let type_name = parser::get_type_name(&field.ty);
if let Some(ident) = field.ident {
let name = ident.to_string();
let mut enable_setter = true;
let mut is_inherent = false;
for attr in field.attrs.iter() {
let arguments = parser::parse_schema_attr(attr);
for (key, value) in arguments.into_iter() {
match key.as_str() {
"constructor" => {
if let Some(value) = value {
if let Some((cons_name, cons_fn)) = value.split_once("::") {
let cons_name_ident = format_ident!("{}", cons_name);
let cons_fn_ident = format_ident!("{}", cons_fn);
let constructor = if type_name == "String" {
quote! {
model.#ident = <#cons_name_ident>::#cons_fn_ident().to_string();
}
} else {
quote! {
model.#ident = <#cons_name_ident>::#cons_fn_ident().into();
}
};
field_constructors.push(constructor);
}
}
}
"composable" => {
let setter = if parser::check_vec_type(&type_name) {
quote! {
if let Some(objects) = data.get_map_array(#name) {
let num_objects = objects.len();
let mut models = Vec::with_capacity(num_objects);
let mut errors = Vec::new();
for (index, object) in objects.iter().enumerate() {
match object.read_as_model() {
Ok(model) => models.push(model),
Err(err) => {
let message = format!("#{index}: {err}");
errors.push(message);
},
}
}
if !errors.is_empty() {
validation.record(#name, errors.join(";"));
}
self.#ident = models;
}
}
} else if parser::check_option_type(&type_name) {
quote! {
if let Some(object) = data.parse_object(#name) {
match object.read_as_model() {
Ok(model) => self.#ident = Some(model),
Err(err) => validation.record(#name, err.to_string()),
}
}
}
} else {
quote! {
if let Some(object) = data.parse_object(#name) {
match object.read_as_model() {
Ok(model) => self.#ident = model,
Err(err) => {
validation.record(#name, err.to_string());
},
}
}
}
};
field_setters.push(setter);
}
"ignore" | "read_only" | "generated" | "reserved" => {
enable_setter = false;
}
"inherent" => {
is_inherent = true;
}
_ => (),
}
}
}
if enable_setter && !RESERVED_FIELDS.contains(&name.as_str()) {
let setter = if type_name == "String" {
if is_inherent {
let parser_ident = format_ident!("parse_{}", name.to_case(Case::Snake));
quote! {
if let Some(value) = data.parse_string(#name) {
match Self::#parser_ident(&value) {
Ok(value) => self.#ident = value,
Err(err) => validation.record_fail(#name, err),
}
}
}
} else if name == "password" {
quote! {
if let Some(password) = data.parse_string(#name) {
use zino_core::orm::ModelHelper;
match Self::encrypt_password(&password) {
Ok(password) => self.password = password,
Err(err) => validation.record_fail(#name, err),
}
}
}
} else {
quote! {
if let Some(value) = data.parse_string(#name) {
self.#ident = value.into_owned();
}
}
}
} else if type_name == "Vec<String>" {
quote! {
if let Some(values) = data.parse_str_array(#name) {
self.#ident = values.into_iter().map(|s| s.to_owned()).collect();
}
}
} else if type_name == "Option<String>" {
quote! {
if let Some(value) = data.parse_string(#name) {
self.#ident = Some(value.into_owned());
}
}
} else if type_name == "Map" {
quote! {
if let Some(object) = data.parse_object(#name) {
self.#ident = object.clone();
}
}
} else if parser::check_vec_type(&type_name) {
quote! {
if let Some(result) = data.parse_array(#name) {
match result {
Ok(values) => self.#ident = values,
Err(err) => validation.record_fail(#name, err),
}
}
}
} else if let Some(type_generics) = parser::parse_option_type(&type_name) {
let parser_ident = format_ident!("parse_{}", type_generics.to_lowercase());
quote! {
if let Some(result) = data.#parser_ident(#name) {
match result {
Ok(value) => self.#ident = Some(value),
Err(err) => {
let raw_value = data.parse_string(#name);
let raw_value_str = raw_value
.as_deref()
.unwrap_or_default();
let message = format!("{err}: `{raw_value_str}`");
validation.record(#name, message);
},
}
}
}
} else {
let parser_ident = format_ident!("parse_{}", type_name.to_lowercase());
quote! {
if let Some(result) = data.#parser_ident(#name) {
match result {
Ok(value) => self.#ident = value,
Err(err) => {
let raw_value = data.parse_string(#name);
let raw_value_str = raw_value
.as_deref()
.unwrap_or_default();
let message = format!("{err}: `{raw_value_str}`");
validation.record(#name, message);
},
}
}
}
};
field_setters.push(setter);
}
}
}
let model_constructor = if field_constructors.is_empty() {
quote! { Self::default() }
} else {
quote! {
let mut model = Self::default();
#(#field_constructors)*
model
}
};
quote! {
use zino_core::validation::Validation;
impl zino_core::model::Model for #name {
#[inline]
fn new() -> Self {
#model_constructor
}
#[must_use]
fn read_map(&mut self, data: &Map) -> Validation {
let mut validation = Validation::new();
if data.is_empty() {
validation.record("data", "should be nonempty");
} else {
#(#field_setters)*
}
validation
}
}
}
}