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//! # Macro
//! **For converting structure to green-barrel model.**
//!
//! ## Usage:
//!
//! [Basic Example](https://github.com/kebasyaty/green-barrel/tree/master/examples/basic "Basic Example")
//!
//! ## Model parameters
//!
//! **_( all parameters are optional )_**
//!
//! | Parameter: | Default: | Description: |
//! | :------------------ | :----------- | :--------------------------------------------------------------------------------------------------- |
//! | db_query_docs_limit | 1000 | limiting query results. |
//! | is_add_doc | true | Create documents in the database. **false** - Alternatively, use it to validate data from web forms. |
//! | is_up_doc | true | Update documents in the database. |
//! | is_del_doc | true | Delete documents from the database. |
//! | ignore_fields | empty string | Fields that are not included in the database (separated by commas). |
//! | is_use_addition | false | Allows methods for additional actions and additional validation. |
//! | is_use_hooks | false | Allows hooks methods - **impl Hooks for ModelName**. |
//!
use proc_macro::TokenStream;
use quote::quote;
use serde::Serialize;
use syn::{
parse2, parse_macro_input, AttributeArgs, Data::Struct, DeriveInput, Fields::Named, NestedMeta,
Type::Path,
};
// MODEL - MACRO FOR CONVERTING STRUCTURE TO GREEN-BARREL MODEL
// #################################################################################################
/// Macro for converting Structure to green-barrel Model.
/// The model can access the database.
/// The model can create, update, and delete documents in collections.
#[allow(non_snake_case)]
#[proc_macro_attribute]
pub fn Model(args: TokenStream, input: TokenStream) -> TokenStream {
let args = parse_macro_input!(args as AttributeArgs);
let mut ast = parse_macro_input!(input as DeriveInput);
impl_create_model(&args, &mut ast)
}
// Parsing fields and attributes of a structure, creating implementation of methods.
// *************************************************************************************************
fn impl_create_model(args: &Vec<NestedMeta>, ast: &mut DeriveInput) -> TokenStream {
let model_name_ident = &ast.ident;
let model_name_str = model_name_ident.to_string();
//
if model_name_str.len() > 30 {
panic!("Model: `{model_name_str}` => Model name: Max size 30 characters.")
}
//
let mut trans_meta = Meta {
model_name: model_name_str.clone(),
..Default::default()
};
//
let mut html_id_map = std::collections::HashMap::<String, String>::new();
//
let mut add_trait_addition = quote! {impl Addition for #model_name_ident {}};
let mut add_trait_hooks = quote! {impl Hooks for #model_name_ident {}};
let add_trait_fixtures = quote! {impl Fixtures for #model_name_ident {}};
// Get Model attributes.
// *********************************************************************************************
for nested_meta in args {
if let NestedMeta::Meta(meta) = nested_meta {
if let syn::Meta::NameValue(mnv) = meta {
if mnv.path.is_ident("database") {
if let syn::Lit::Str(lit_str) = &mnv.lit {
trans_meta.database_name = lit_str.value().trim().to_string();
} else {
panic!(
"Model: `{model_name_str}` => Could not determine value for \
parameter `database`. Use the `&str` type."
)
}
} else if mnv.path.is_ident("db_query_docs_limit") {
if let syn::Lit::Int(lit_int) = &mnv.lit {
trans_meta.db_query_docs_limit = lit_int.base10_parse::<u32>().unwrap();
} else {
panic!(
"Model: `{model_name_str}` => Could not determine value for \
parameter `db_query_docs_limit`. Use the `&str` type."
)
}
} else if mnv.path.is_ident("is_add_doc") {
if let syn::Lit::Bool(lit_bool) = &mnv.lit {
trans_meta.is_add_doc = lit_bool.value;
} else {
panic!(
"Model: `{model_name_str}` => Could not determine value for \
parameter `is_add_docs`. Use the `bool` type."
)
}
} else if mnv.path.is_ident("is_up_doc") {
if let syn::Lit::Bool(lit_bool) = &mnv.lit {
trans_meta.is_up_doc = lit_bool.value;
} else {
panic!(
"Model: `{model_name_str}` => Could not determine value for \
parameter `is_up_docs`. Use the `bool` type."
)
}
} else if mnv.path.is_ident("is_del_doc") {
if let syn::Lit::Bool(lit_bool) = &mnv.lit {
trans_meta.is_del_doc = lit_bool.value;
} else {
panic!(
"Model: `{model_name_str}` => Could not determine value for \
parameter `is_del_docs`. Use the `bool` type."
)
}
} else if mnv.path.is_ident("ignore_fields") {
if let syn::Lit::Str(lit_str) = &mnv.lit {
let mut value = lit_str.value();
value.retain(|chr| !chr.is_whitespace());
trans_meta.ignore_fields = value
.to_lowercase()
.split(',')
.map(|item| item.to_string())
.collect();
} else {
panic!(
"Model: `{model_name_str}` => Could not determine value for \
parameter `ignore_fields`. Use the type `&str` in \
the format - <field_name, field_name>."
)
}
} else if mnv.path.is_ident("is_use_addition") {
if let syn::Lit::Bool(lit_bool) = &mnv.lit {
trans_meta.is_use_addition = lit_bool.value;
if lit_bool.value {
add_trait_addition = quote! {};
}
} else {
panic!(
"Model: `{model_name_str}` => Could not determine value for \
parameter `is_use_addition`. Use the `bool` type."
)
}
} else if mnv.path.is_ident("is_use_hooks") {
if let syn::Lit::Bool(lit_bool) = &mnv.lit {
trans_meta.is_use_hooks = lit_bool.value;
if lit_bool.value {
add_trait_hooks = quote! {};
}
} else {
panic!(
"Model: `{model_name_str}` => Could not determine value for \
parameter `is_use_hooks`. Use the `bool` type."
)
}
} else {
panic!(
"Model: `{model_name_str}` => Invalid parameter! => \
Valid Parameters: database | db_client_name | db_query_docs_limit | \
is_add_doc | is_up_doc | is_del_doc | ignore_fields | \
is_use_add_valid | is_use_hooks"
)
}
} else {
panic!("Model: `{model_name_str}` => syn::Meta::NameValue is missing.")
}
}
}
// Get fields of Model.
// *********************************************************************************************
if let Struct(ref mut data) = &mut ast.data {
if let Named(ref mut fields) = &mut data.fields {
let fields = &mut fields.named;
//
for field in fields.clone() {
// Get field name.
if let Some(ident) = &field.ident {
let field_name = ident.to_string();
// Check for fields with reserved names - 'hash', `created_at`, `updated_at`.
if field_name == "hash" {
panic!("Model: `{model_name_str}` => The field named `hash` is reserved.")
} else if field_name == "created_at" {
panic!(
"Model: `{model_name_str}` => The field named `created_at` is reserved."
)
} else if field_name == "updated_at" {
panic!(
"Model: `{model_name_str}` => The field named `updated_at` is reserved."
)
}
}
}
// Add new field `hash`.
let new_hash_field: syn::FieldsNamed = parse2(quote! {
{pub hash: Hash}
})
.unwrap_or_else(|err| panic!("{}", err.to_string()));
let new_hash_field = new_hash_field.named.first().unwrap().to_owned();
fields.push(new_hash_field);
// Add new field `created_at`.
let new_created_at_field: syn::FieldsNamed = parse2(quote! {
{pub created_at: HiddenDateTime}
})
.unwrap_or_else(|err| panic!("{}", err.to_string()));
let new_created_at_field = new_created_at_field.named.first().unwrap().to_owned();
fields.push(new_created_at_field);
// Add new field `updated_at`.
let new_updated_at_field: syn::FieldsNamed = parse2(quote! {
{pub updated_at: HiddenDateTime}
})
.unwrap_or_else(|err| panic!("{}", err.to_string()));
let new_updated_at_field = new_updated_at_field.named.first().unwrap().to_owned();
fields.push(new_updated_at_field);
// Get the number of fields.
trans_meta.fields_count = fields.len();
// Loop over fields.
// -------------------------------------------------------------------------------------
for field in fields {
let mut field_name = String::new();
let mut field_type = String::new();
//
// Get field name.
if let Some(ident) = &field.ident {
field_name = ident.to_string();
trans_meta.fields_name.push(field_name.clone());
}
// Add field name and field value type to map.
if let Path(ty) = &field.ty {
field_type = {
let tmp_str = quote! {#ty}.to_string();
let tmp_vec = tmp_str.split("::").collect::<Vec<&str>>();
tmp_vec[tmp_vec.len() - 1].trim().to_string()
};
let field_info = get_field_info(
model_name_str.as_str(),
field_name.as_str(),
field_type.as_str(),
)
.unwrap();
trans_meta
.field_value_type_map
.insert(field_name.clone(), field_info.0.to_string());
}
// Add field name and Widget name to map.
trans_meta
.field_type_map
.insert(field_name.clone(), field_type);
//
// Add field name and Widget html id to map.
html_id_map.insert(
field_name.clone(),
get_html_id(model_name_str.as_str(), field_name.as_str()),
);
//
// Delete field attributes.
// ( To avoid conflicts with the compiler )
field.attrs = Vec::new();
}
} else {
panic!("Model: `{model_name_str}` => Expected a struct with named fields.")
}
}
// Post processing.
// *********************************************************************************************
// Checking the name of ignored fields.
for field_name in trans_meta.ignore_fields.iter() {
if !trans_meta.fields_name.contains(field_name) {
panic!(
"Model: `{model_name_str}` => Model does not have an ignored field named `{field_name}`."
)
}
}
// trans_meta to Json-line.
let trans_meta_json = match serde_json::to_string(&trans_meta) {
Ok(json_line) => json_line,
Err(err) => panic!("Model: `{model_name_str}` => {0:?}", err),
};
// html_id_map to Json-line.
let html_id_map_json = match serde_json::to_string(&html_id_map) {
Ok(json_line) => json_line,
Err(err) => panic!("Model: `{model_name_str}` => {0:?}", err),
};
// Implementation of methods.
// *********************************************************************************************
let output = quote! {
#ast
/// All methods that directly depend on the macro.
// *****************************************************************************************
impl Main for #model_name_ident {
/// Get model key.
/// Hint: To access data in the cache.
// -------------------------------------------------------------------------------------
fn key() -> Result<String, Box<dyn std::error::Error>> {
let re = regex::Regex::new(r"(?P<upper_chr>[A-Z])")?;
Ok(format!(
"{}__{}__{}",
SERVICE_NAME.trim(),
re.replace_all(stringify!(#model_name_ident), "_$upper_chr"),
UNIQUE_APP_KEY.trim().to_string()
)
.to_lowercase())
}
/// Get a new model instance with custom settings.
// -------------------------------------------------------------------------------------
fn custom_to_json_val() -> Result<serde_json::Value, Box<dyn std::error::Error>>
where
Self: serde::de::DeserializeOwned + Sized,
{
let mut instance_json_val = serde_json::to_value(Self::custom())?;
let html_id_map =
serde_json::from_str::<std::collections::HashMap<&str, &str>>(&#html_id_map_json)?;
for (field_name, id_name) in html_id_map {
// Check field attributes.
if let Some(required) = instance_json_val.get(field_name).unwrap().get("required") {
let is_required = required.as_bool().unwrap();
if is_required {
if (instance_json_val.get(field_name).unwrap().get("disabled").unwrap().as_bool().unwrap()
|| instance_json_val.get(field_name).unwrap().get("readonly").unwrap().as_bool().unwrap()
|| instance_json_val.get(field_name).unwrap().get("is_hide").unwrap().as_bool().unwrap()) {
//
Err(format!(
"Field: `{}` => Attribute required=true incompatible with \
disabled=true or readonly=true or is_hide=true.",
field_name
))?
}
}
}
// Thumbnails sorting and validation.
if let Some(arr) = instance_json_val.get(field_name).unwrap().get("thumbnails") {
let mut arr = serde_json::from_value::<Vec<(String, u32)>>(arr.clone())?;
arr.sort_by(|a, b| b.1.partial_cmp(&a.1).unwrap());
let valid_size_names: [&str; 4] = ["xs", "sm", "md", "lg"];
for size in arr.iter() {
if !valid_size_names.contains(&size.0.as_str()) {
Err(format!(
"Field: `{}` => \
Valid size names - `xs`, `sm`, `md`, `lg`.",
field_name
))?
}
}
*instance_json_val
.get_mut(field_name)
.unwrap()
.get_mut("thumbnails")
.unwrap() = serde_json::json!(arr);
}
// Forbid the use of the `value` field attribute.
if let Some(val) = instance_json_val.get(field_name).unwrap().get("value") {
if !val.is_null() {
Err(format!(
"Field: `{}` => \
For default values, use the `default` field attribute.",
field_name
))?
}
}
// For dynamic field types, the `choices` parameter must be an empty vector.
if let Some(field_type) = instance_json_val.get(field_name).unwrap().get("field_type") {
if field_type.as_str().unwrap().contains("Dyn") {
if let Some(options) = instance_json_val.get(field_name).unwrap().get("choices") {
if options.as_array().unwrap().len() > 0 {
Err(format!(
"Field: `{}` => \
For dynamic field types, the `choices` parameter must be an empty vector.",
field_name
))?
}
}
}
}
// Add `id` and `name`
*instance_json_val
.get_mut(field_name)
.unwrap()
.get_mut("id")
.unwrap() = serde_json::json!(id_name);
*instance_json_val
.get_mut(field_name)
.unwrap()
.get_mut("name")
.unwrap() = serde_json::json!(field_name);
}
//
Ok(instance_json_val)
}
/// Generate metadata of Model.
// -------------------------------------------------------------------------------------
fn generate_metadata() -> Result<Meta, Box<dyn std::error::Error>>
where
Self: serde::de::DeserializeOwned + Sized,
{
let re = regex::Regex::new(r"(?P<upper_chr>[A-Z])").unwrap();
let mut meta = serde_json::from_str::<Meta>(&#trans_meta_json)?;
let service_name: String = SERVICE_NAME.trim().to_string();
// Add project name.
meta.app_name = APP_NAME.trim().to_string();
// Add unique project key.
meta.unique_app_key = UNIQUE_APP_KEY.trim().to_string();
// Add service name.
meta.service_name = service_name.clone();
// Add database name.
if meta.database_name.is_empty() {
meta.database_name = format!(
"{}__{}__{}",
meta.app_name,
DATABASE_NAME.trim().to_string(),
meta.unique_app_key);
}
// Add a limit on the number of documents when querying the database.
if meta.db_query_docs_limit == 0 {
meta.db_query_docs_limit = DB_QUERY_DOCS_LIMIT;
}
// Add collection name.
meta.collection_name = format!(
"{}_{}",
service_name,
re.replace_all(&meta.model_name[..], "_$upper_chr")
)
.to_lowercase();
// Add default_value_map
let mut default_value_map = std::collections::HashMap::<String, serde_json::Value>::new();
let model_json = Self::custom_to_json_val()?;
for (field_name, field_type) in meta.field_type_map.iter() {
let default = if let Some(val) = model_json.get(field_name).unwrap().get("default") {
val.clone()
} else {
serde_json::json!(null)
};
default_value_map.insert(field_name.to_string(), default);
// Determine if there are fields of type Slug and if they use a hash field as a source.
if !meta.is_use_hash_slug && field_type == "Slug" {
let flag = model_json
.get(field_name)
.unwrap()
.get("slug_sources")
.unwrap()
.as_array()
.unwrap()
.iter()
.map(|item| item.as_str().unwrap())
.any(|item| item == "hash");
if flag {
meta.is_use_hash_slug = flag;
}
}
}
meta.default_value_map = default_value_map;
meta.model_json = model_json;
//
Ok(meta)
}
/// Getter and Setter for field `hash`.
// -------------------------------------------------------------------------------------
fn hash(&self) -> String {
self.hash.value.clone().unwrap_or_default()
}
fn set_hash(&mut self, value: String) {
self.hash.value = Some(value);
}
/// ObjectId from hash field.
// -------------------------------------------------------------------------------------
fn obj_id(&self) -> Result<Option<mongodb::bson::oid::ObjectId>, Box<dyn std::error::Error>> {
let hash = self.hash.value.clone().unwrap_or_default();
if let Ok(obj_id) = mongodb::bson::oid::ObjectId::parse_str(hash.as_str()) {
return Ok(Some(obj_id));
}
Ok(None)
}
/// ObjectId to hash field.
// -------------------------------------------------------------------------------------
fn set_obj_id(&mut self, obj_id: mongodb::bson::oid::ObjectId) {
self.hash.value = Some(obj_id.to_hex());
}
/// Getter and Setter for field `created_at`.
// -------------------------------------------------------------------------------------
fn created_at(&self) -> String {
self.created_at.value.clone().unwrap_or_default()
}
fn set_created_at(&mut self, value: String) {
self.created_at.value = Some(value);
}
/// Getter and Setter for field `updated_at`.
/// ------------------------------------------------------------------------------------
fn updated_at(&self) -> String {
self.updated_at.value.clone().unwrap_or_default()
}
fn set_updated_at(&mut self, value: String) {
self.updated_at.value = Some(value);
}
/// Serializing the model instance to serde_json::Value format.
// -------------------------------------------------------------------------------------
fn self_to_json_val(&self)
-> Result<serde_json::Value, Box<dyn std::error::Error>> {
Ok(serde_json::to_value(self)?)
}
}
/// A set of methods for custom validation.
// *****************************************************************************************
#add_trait_addition
/// Methods that are called at different stages when accessing the database.
/// ****************************************************************************************
#add_trait_hooks
/// To populate the database with pre-created data.
// *****************************************************************************************
#add_trait_fixtures
/// Caching information about Models for speed up work.
// *****************************************************************************************
impl Caching for #model_name_ident {}
/// Validating Model fields for save and update.
// *****************************************************************************************
impl Validation for #model_name_ident {}
/// Database Query API
// *****************************************************************************************
/// Output data converters for database queries.
impl Converters for #model_name_ident {}
/// Common database query methods.
impl QCommons for #model_name_ident {}
/// Query methods for a Model instance.
impl QPaladins for #model_name_ident {}
};
// Hand the output tokens back to the compiler.
TokenStream::from(output)
}
// AUXILIARY STRUCTURES AND FUNCTIONS
// #################################################################################################
/// Transporting of metadate to implementation of methods.
// *************************************************************************************************
#[derive(Serialize)]
struct Meta {
pub model_name: String,
pub app_name: String,
pub unique_app_key: String,
pub service_name: String,
pub database_name: String,
pub db_query_docs_limit: u32,
pub collection_name: String, // Field type map
pub fields_count: usize,
pub fields_name: Vec<String>,
pub is_add_doc: bool,
pub is_up_doc: bool,
pub is_del_doc: bool,
pub is_use_addition: bool,
pub is_use_hooks: bool,
pub is_use_hash_slug: bool,
// <field_name, field_value_type>
pub field_value_type_map: std::collections::HashMap<String, String>,
// <field_name, field_type>
pub field_type_map: std::collections::HashMap<String, String>,
// <field_name, default_value>
pub default_value_map: std::collections::HashMap<String, serde_json::Value>,
// List of field names that will not be saved to the database
pub ignore_fields: Vec<String>,
// Choice maps for fields type `choice`. Format: <field_name, choices>
pub choice_str_map: std::collections::HashMap<String, Vec<String>>,
pub choice_i32_map: std::collections::HashMap<String, Vec<i32>>,
pub choice_i64_map: std::collections::HashMap<String, Vec<i64>>,
pub choice_f64_map: std::collections::HashMap<String, Vec<f64>>,
pub model_json: serde_json::Value,
}
impl Default for Meta {
fn default() -> Self {
Meta {
model_name: String::new(),
app_name: String::new(),
unique_app_key: String::new(),
service_name: String::new(),
database_name: String::new(),
db_query_docs_limit: 0_u32,
collection_name: String::new(),
fields_count: 0_usize,
fields_name: Vec::new(),
is_add_doc: true,
is_up_doc: true,
is_del_doc: true,
is_use_addition: false,
is_use_hooks: false,
is_use_hash_slug: false,
field_value_type_map: std::collections::HashMap::new(),
field_type_map: std::collections::HashMap::new(),
default_value_map: std::collections::HashMap::new(),
ignore_fields: Vec::new(),
choice_str_map: std::collections::HashMap::new(),
choice_i32_map: std::collections::HashMap::new(),
choice_i64_map: std::collections::HashMap::new(),
choice_f64_map: std::collections::HashMap::new(),
model_json: serde_json::json!(null),
}
}
}
/// Get field info.
// *************************************************************************************************
fn get_field_info<'a>(
model_name: &'a str,
field_name: &'a str,
field_type: &'a str,
) -> Result<(&'a str, &'a str), Box<dyn std::error::Error>> {
let info: (&'a str, &'a str) = match field_type {
"Bool" => ("bool", "checkbox"),
"Color" => ("String", "color"),
"Date" => ("String", "date"),
"DateTime" => ("String", "datetime"),
"Email" => ("String", "email"),
"File" => ("String", "file"),
"Image" => ("String", "file"),
"I32" => ("i32", "number"),
"U32" => ("u32", "number"),
"I64" => ("i64", "number"),
"F64" => ("f64", "number"),
"Password" => ("String", "password"),
"Phone" => ("String", "tel"),
"Text" => ("String", "text"),
"Slug" => ("String", "text"),
"URL" => ("String", "url"),
"IP" => ("String", "text"),
"ChoiceText" => ("String", "select"),
"ChoiceTextDyn" => ("String", "select"),
"ChoiceTextMult" => ("Vec<String>", "select"),
"ChoiceTextMultDyn" => ("Vec<String>", "select"),
"ChoiceI32" => ("i32", "select"),
"ChoiceI32Dyn" => ("i32", "select"),
"ChoiceI32Mult" => ("Vec<i32>", "select"),
"ChoiceI32MultDyn" => ("Vec<i32>", "select"),
"ChoiceU32" => ("u32", "select"),
"ChoiceU32Dyn" => ("u32", "select"),
"ChoiceU32Mult" => ("Vec<u32>", "select"),
"ChoiceU32MultDyn" => ("Vec<u32>", "select"),
"ChoiceI64" => ("i64", "select"),
"ChoiceI64Dyn" => ("i64", "select"),
"ChoiceI64Mult" => ("Vec<i64>", "select"),
"ChoiceI64MultDyn" => ("Vec<i64>", "select"),
"ChoiceF64" => ("f64", "select"),
"ChoiceF64Dyn" => ("f64", "select"),
"ChoiceF64Mult" => ("Vec<f64>", "select"),
"ChoiceF64MultDyn" => ("Vec<f64>", "select"),
"Hash" => ("String", "text"),
"HiddenDateTime" => ("String", "datetime"),
_ => Err(format!(
"Model: `{model_name}` > Field: `{field_name}` > Field type: `{field_type}` => \
Invalid field type."
))?,
};
//
Ok(info)
}
/// Get Html-ID for Field.
// *************************************************************************************************
fn get_html_id<'a>(model_name: &'a str, field_name: &'a str) -> String {
let field_name_upper = field_name
.split('_')
.map(|word| word[0..1].to_uppercase() + &word[1..])
.collect::<Vec<String>>()
.join("");
format!("{model_name}-{field_name_upper}")
}