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use syn;
use validator::Validator;
use lit::*;
#[derive(Debug)]
pub struct SchemaValidation {
pub function: String,
pub skip_on_field_errors: bool,
pub code: Option<String>,
pub message: Option<String>,
}
#[derive(Debug)]
pub struct FieldValidation {
pub code: String,
pub message: Option<String>,
pub validator: Validator,
}
impl FieldValidation {
pub fn new(validator: Validator) -> FieldValidation {
FieldValidation { code: validator.code().to_string(), validator, message: None }
}
}
pub fn extract_length_validation(
field: String,
meta_items: &Vec<syn::NestedMeta>,
) -> FieldValidation {
let mut min = None;
let mut max = None;
let mut equal = None;
let (message, code) = extract_message_and_code("length", &field, meta_items);
let error = |msg: &str| -> ! {
panic!("Invalid attribute #[validate] on field `{}`: {}", field, msg);
};
for meta_item in meta_items {
if let syn::NestedMeta::Meta(ref item) = *meta_item {
if let syn::Meta::NameValue(syn::MetaNameValue { ref ident, ref lit, .. }) = *item {
match ident.to_string().as_ref() {
"message" | "code" => continue,
"min" => {
min = match lit_to_int(lit) {
Some(s) => Some(s),
None => error("invalid argument type for `min` of `length` validator: only integers are allowed"),
};
},
"max" => {
max = match lit_to_int(lit) {
Some(s) => Some(s),
None => error("invalid argument type for `max` of `length` validator: only integers are allowed"),
};
},
"equal" => {
equal = match lit_to_int(lit) {
Some(s) => Some(s),
None => error("invalid argument type for `equal` of `length` validator: only integers are allowed"),
};
},
v => error(&format!(
"unknown argument `{}` for validator `length` (it only has `min`, `max`, `equal`)",
v
))
}
} else {
panic!(
"unexpected item {:?} while parsing `length` validator of field {}",
item, field
)
}
}
}
if equal.is_some() && (min.is_some() || max.is_some()) {
error("both `equal` and `min` or `max` have been set in `length` validator: probably a mistake");
}
if min.is_none() && max.is_none() && equal.is_none() {
error("Validator `length` requires at least 1 argument out of `min`, `max` and `equal`");
}
let validator = Validator::Length { min, max, equal };
FieldValidation {
message,
code: code.unwrap_or_else(|| validator.code().to_string()),
validator,
}
}
pub fn extract_range_validation(
field: String,
meta_items: &Vec<syn::NestedMeta>,
) -> FieldValidation {
let mut min = 0.0;
let mut max = 0.0;
let (message, code) = extract_message_and_code("range", &field, meta_items);
let error = |msg: &str| -> ! {
panic!("Invalid attribute #[validate] on field `{}`: {}", field, msg);
};
let mut has_min = false;
let mut has_max = false;
for meta_item in meta_items {
match *meta_item {
syn::NestedMeta::Meta(ref item) => match *item {
syn::Meta::NameValue(syn::MetaNameValue { ref ident, ref lit, .. }) => match ident
.to_string()
.as_ref()
{
"message" | "code" => continue,
"min" => {
min = match lit_to_float(lit) {
Some(s) => s,
None => error("invalid argument type for `min` of `range` validator: only integers are allowed")
};
has_min = true;
}
"max" => {
max = match lit_to_float(lit) {
Some(s) => s,
None => error("invalid argument type for `max` of `range` validator: only integers are allowed")
};
has_max = true;
}
v => error(&format!(
"unknown argument `{}` for validator `range` (it only has `min`, `max`)",
v
)),
},
_ => panic!("unexpected item {:?} while parsing `range` validator", item),
},
_ => unreachable!(),
}
}
if !has_min || !has_max {
error("Validator `range` requires 2 arguments: `min` and `max`");
}
let validator = Validator::Range { min, max };
FieldValidation {
message,
code: code.unwrap_or_else(|| validator.code().to_string()),
validator,
}
}
pub fn extract_argless_validation(
validator_name: String,
field: String,
meta_items: &Vec<syn::NestedMeta>,
) -> FieldValidation {
let (message, code) = extract_message_and_code(&validator_name, &field, meta_items);
for meta_item in meta_items {
match *meta_item {
syn::NestedMeta::Meta(ref item) => match *item {
syn::Meta::NameValue(syn::MetaNameValue { ref ident, .. }) => {
match ident.to_string().as_ref() {
"message" | "code" => continue,
v => panic!(
"Unknown argument `{}` for validator `{}` on field `{}`",
v, validator_name, field
),
}
}
_ => panic!("unexpected item {:?} while parsing `range` validator", item),
},
_ => unreachable!(),
}
}
let validator = match validator_name.as_ref() {
"email" => Validator::Email,
#[cfg(feature = "card")]
"credit_card" => Validator::CreditCard,
#[cfg(feature = "phone")]
"phone" => Validator::Phone,
_ => Validator::Url,
};
FieldValidation {
message,
code: code.unwrap_or_else(|| validator.code().to_string()),
validator,
}
}
pub fn extract_one_arg_validation(
val_name: &str,
validator_name: String,
field: String,
meta_items: &Vec<syn::NestedMeta>,
) -> FieldValidation {
let mut value = None;
let (message, code) = extract_message_and_code(&validator_name, &field, meta_items);
for meta_item in meta_items {
match *meta_item {
syn::NestedMeta::Meta(ref item) => match *item {
syn::Meta::NameValue(syn::MetaNameValue { ref ident, ref lit, .. }) => {
match ident.to_string().as_ref() {
"message" | "code" => continue,
v if v == val_name => {
value = match lit_to_string(lit) {
Some(s) => Some(s),
None => panic!(
"Invalid argument type for `{}` for validator `{}` on field `{}`: only a string is allowed",
val_name, validator_name, field
),
};
}
v => panic!(
"Unknown argument `{}` for validator `{}` on field `{}`",
v, validator_name, field
),
}
}
_ => panic!("unexpected item {:?} while parsing `range` validator", item),
},
_ => unreachable!(),
}
}
if value.is_none() {
panic!(
"Missing argument `{}` for validator `{}` on field `{}`",
val_name, validator_name, field
);
}
let validator = match validator_name.as_ref() {
"custom" => Validator::Custom(value.unwrap()),
"contains" => Validator::Contains(value.unwrap()),
"must_match" => Validator::MustMatch(value.unwrap()),
"regex" => Validator::Regex(value.unwrap()),
_ => unreachable!(),
};
FieldValidation {
message,
code: code.unwrap_or_else(|| validator.code().to_string()),
validator,
}
}
fn extract_message_and_code(
validator_name: &str,
field: &str,
meta_items: &Vec<syn::NestedMeta>,
) -> (Option<String>, Option<String>) {
let mut message = None;
let mut code = None;
for meta_item in meta_items {
if let syn::NestedMeta::Meta(syn::Meta::NameValue(syn::MetaNameValue {
ref ident,
ref lit,
..
})) = *meta_item
{
match ident.to_string().as_ref() {
"code" => {
code = match lit_to_string(lit) {
Some(s) => Some(s),
None => panic!(
"Invalid argument type for `code` for validator `{}` on field `{}`: only a string is allowed",
validator_name, field
),
};
}
"message" => {
message = match lit_to_string(lit) {
Some(s) => Some(s),
None => panic!(
"Invalid argument type for `message` for validator `{}` on field `{}`: only a string is allowed",
validator_name, field
),
};
}
_ => continue,
}
}
}
(message, code)
}
