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use valuable::{NamedValues, Valuable, Value, Visit};
struct Print(String);
impl Print {
fn indent(&self) -> Print {
Print(format!("{} ", self.0))
}
}
impl Visit for Print {
fn visit_value(&mut self, value: Value<'_>) {
match value {
Value::Structable(v) => {
let def = v.definition();
// Print the struct name
println!("{}{}:", self.0, def.name());
// Visit fields
let mut visit = self.indent();
v.visit(&mut visit);
}
Value::Enumerable(v) => {
let def = v.definition();
let variant = v.variant();
// Print the enum name
println!("{}{}::{}:", self.0, def.name(), variant.name());
// Visit fields
let mut visit = self.indent();
v.visit(&mut visit);
}
Value::Listable(v) => {
println!("{}", self.0);
// Visit fields
let mut visit = self.indent();
v.visit(&mut visit);
}
Value::Mappable(v) => {
println!("{}", self.0);
// Visit fields
let mut visit = self.indent();
v.visit(&mut visit);
}
// Primitive or unknown type, just render Debug
v => println!("{:?}", v),
}
}
fn visit_named_fields(&mut self, named_values: &NamedValues<'_>) {
for (field, value) in named_values {
print!("{}- {}: ", self.0, field.name());
value.visit(self);
}
}
fn visit_unnamed_fields(&mut self, values: &[Value<'_>]) {
for value in values {
print!("{}- ", self.0);
value.visit(self);
}
}
fn visit_entry(&mut self, key: Value<'_>, value: Value<'_>) {
print!("{}- {:?}: ", self.0, key);
value.visit(self);
}
}
#[derive(Valuable)]
struct Person {
name: String,
age: u32,
addresses: Vec<Address>,
}
#[derive(Valuable)]
struct Address {
street: String,
city: String,
zip: String,
}
fn main() {
let person = Person {
name: "Angela Ashton".to_string(),
age: 31,
addresses: vec![
Address {
street: "123 1st Ave".to_string(),
city: "Townsville".to_string(),
zip: "12345".to_string(),
},
Address {
street: "555 Main St.".to_string(),
city: "New Old Town".to_string(),
zip: "55555".to_string(),
},
],
};
let mut print = Print("".to_string());
valuable::visit(&person, &mut print);
}
|
