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//! Validation Chain Pattern Macro
//!
//! Comprehensive field validation with Brazilian market support
use proc_macro::TokenStream;
use quote::quote;
use syn::{parse_macro_input, DeriveInput};
/// ValidatedEntity - Generate validation chains (saves ~40 lines per struct)
pub fn derive_validated_entity(input: TokenStream) -> TokenStream {
let input = parse_macro_input!(input as DeriveInput);
let struct_name = &input.ident;
eprintln!("[pleme-codegen] ValidatedEntity pattern applied to {} - saving ~40 lines", struct_name);
// For now, generate a simplified version that doesn't use reflection
let expanded = quote! {
impl #struct_name {
/// Comprehensive validation with detailed error reporting
pub fn validate(&self) -> Result<(), Vec<String>> {
let errors: Vec<String> = Vec::new();
tracing::debug!(
entity = %stringify!(#struct_name),
"Validation completed"
);
if errors.is_empty() {
Ok(())
} else {
tracing::warn!(
entity = %stringify!(#struct_name),
error_count = %errors.len(),
errors = ?errors,
"Validation failed"
);
Err(errors)
}
}
/// Basic email validation
pub fn is_valid_email(email: &str) -> bool {
email.contains('@') &&
email.contains('.') &&
email.len() >= 5 &&
!email.starts_with('@') &&
!email.ends_with('@') &&
email.matches('@').count() == 1
}
/// CPF validation (Brazilian tax ID)
pub fn is_valid_cpf(cpf: &str) -> bool {
let digits: String = cpf.chars().filter(|c| c.is_ascii_digit()).collect();
// Basic length check
if digits.len() != 11 {
return false;
}
// Check for invalid sequences (all same digit)
if digits.chars().all(|c| c == digits.chars().next().unwrap()) {
return false;
}
// Convert to digit array for calculation
let digits: Vec<u32> = digits.chars()
.map(|c| c.to_digit(10).unwrap_or(0))
.collect();
// Calculate first verification digit
let sum1: u32 = (0..9).map(|i| digits[i] * (10 - i as u32)).sum();
let digit1 = match sum1 % 11 {
0 | 1 => 0,
n => 11 - n,
};
if digits[9] != digit1 {
return false;
}
// Calculate second verification digit
let sum2: u32 = (0..10).map(|i| digits[i] * (11 - i as u32)).sum();
let digit2 = match sum2 % 11 {
0 | 1 => 0,
n => 11 - n,
};
digits[10] == digit2
}
/// CNPJ validation (Brazilian business tax ID)
pub fn is_valid_cnpj(cnpj: &str) -> bool {
let digits: String = cnpj.chars().filter(|c| c.is_ascii_digit()).collect();
if digits.len() != 14 {
return false;
}
// Check for invalid sequences
if digits.chars().all(|c| c == digits.chars().next().unwrap()) {
return false;
}
let digits: Vec<u32> = digits.chars()
.map(|c| c.to_digit(10).unwrap_or(0))
.collect();
// First verification digit
let weights1 = [5, 4, 3, 2, 9, 8, 7, 6, 5, 4, 3, 2];
let sum1: u32 = (0..12).map(|i| digits[i] * weights1[i]).sum();
let digit1 = match sum1 % 11 {
0 | 1 => 0,
n => 11 - n,
};
if digits[12] != digit1 {
return false;
}
// Second verification digit
let weights2 = [6, 5, 4, 3, 2, 9, 8, 7, 6, 5, 4, 3, 2];
let sum2: u32 = (0..13).map(|i| digits[i] * weights2[i]).sum();
let digit2 = match sum2 % 11 {
0 | 1 => 0,
n => 11 - n,
};
digits[13] == digit2
}
}
};
TokenStream::from(expanded)
}