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use super::utils::NameGenerator;
use crate::ast;
use proc_macro2::TokenStream;
use quote::{quote, ToTokens};
pub(super) fn generate_registration_functions(schema: &ast::DatabaseSchema) -> TokenStream {
let mut functions = TokenStream::new();
for table in &schema.interning_tables {
if let syn::Type::Tuple(ref tuple) = table.value {
let function = generate_intern_tuple_registration(tuple, table, schema);
functions.extend(function);
} else {
let function = generate_intern_value_registration(table, schema);
functions.extend(function);
};
}
for relation in &schema.relations {
let function = generate_relation_registration(&relation, schema);
functions.extend(function);
}
functions
}
fn generate_intern_tuple_registration(
values: &syn::TypeTuple,
table: &ast::InterningTable,
schema: &ast::DatabaseSchema,
) -> TokenStream {
let registration_function_name = table.get_registration_function_name();
let key_type = table.get_key_type();
let mut interning_tokens = TokenStream::new();
let mut param_tokens = TokenStream::new();
let mut arg_tokens = TokenStream::new();
for value_type in values.elems.pairs().map(|pair| pair.into_value()) {
let template = format!("value_{}", value_type.to_token_stream()).to_lowercase();
let mut name_generator = NameGenerator::new(template);
let (final_name, param_type, tokens) =
generate_interning_type(&value_type, schema, &mut name_generator);
let param_name = name_generator.get_ident();
param_tokens.extend(quote! {
#param_name: #param_type,
});
interning_tokens.extend(tokens);
arg_tokens.extend(quote! {
#final_name,
});
}
let table_name = &table.name;
quote! {
pub fn #registration_function_name(&mut self, #param_tokens) -> #key_type {
#interning_tokens
self.interning_tables.#table_name.intern((#arg_tokens))
}
}
}
fn generate_intern_value_registration(
table: &ast::InterningTable,
schema: &ast::DatabaseSchema,
) -> TokenStream {
let registration_function_name = table.get_registration_function_name();
let key_type = table.get_key_type();
let mut name_generator = NameGenerator::new(String::from("value"));
let (final_name, param_type, tokens) =
generate_interning_type(&key_type, schema, &mut name_generator);
let param_name = name_generator.get_ident();
quote! {
pub fn #registration_function_name(&mut self, #param_name: #param_type) -> #key_type {
#tokens
#final_name
}
}
}
fn generate_relation_registration(
relation: &ast::Relation,
schema: &ast::DatabaseSchema,
) -> TokenStream {
let registration_function_name = relation.get_registration_function_name();
let mut param_tokens = TokenStream::new();
let mut return_tokens = TokenStream::new();
let mut return_type_tokens = TokenStream::new();
let mut interning_tokens = TokenStream::new();
let mut arg_tokens = TokenStream::new();
for ast::RelationParameter {
name,
typ,
is_autogenerated,
} in &relation.parameters
{
if *is_autogenerated {
let id = schema
.find_incremental_id(typ)
.expect("Only incremental IDs can be marked with `auto`.");
let generator_fn_name = id.get_generator_fn_name();
interning_tokens.extend(quote! {
let #name = self.counters.#generator_fn_name();
});
return_type_tokens.extend(quote! {#typ,});
return_tokens.extend(quote! {#name,});
arg_tokens.extend(quote! {#name,});
} else {
let mut name_generator = NameGenerator::new(name.to_string());
let (final_name, param_type, tokens) =
generate_interning_type(&typ, schema, &mut name_generator);
let param_name = name_generator.get_ident();
param_tokens.extend(quote! {
#param_name: #param_type,
});
interning_tokens.extend(tokens);
arg_tokens.extend(quote! {#final_name,});
}
}
let table_name = &relation.name;
quote! {
pub fn #registration_function_name(&mut self, #param_tokens) -> (#return_type_tokens) {
#interning_tokens
self.relations.#table_name.insert((#arg_tokens));
(#return_tokens)
}
}
}
fn generate_interning_type(
target_type: &syn::Type,
schema: &ast::DatabaseSchema,
name_generator: &mut NameGenerator,
) -> (syn::Ident, syn::Type, TokenStream) {
let var_name = name_generator.get_ident();
let mut found_type = None;
let mut tokens = TokenStream::new();
for table in &schema.interning_tables {
if &table.get_key_type() == target_type {
assert!(found_type.is_none(), "Ambigous interning tables");
if let syn::Type::Tuple(_) = table.value {
continue;
}
name_generator.inc();
let (new_name, new_found_type, prefix) =
generate_interning_type(&table.value, schema, name_generator);
found_type = Some(new_found_type);
tokens.extend(prefix);
let table_name = &table.name;
tokens.extend(quote! {
let #var_name = self.interning_tables.#table_name.intern(#new_name);
});
}
}
if let Some(final_type) = found_type {
(var_name, final_type, tokens)
} else {
(var_name, target_type.clone(), tokens)
}
}