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//! A list of keywords to query on Google Trend
//! Keywords is limited to a maximum of 5 keywords.
use crate::errors::{KeywordMaxCapacity, KeywordMinCapacity};
use std::fmt::{Display, Formatter, Result};
#[derive(Clone, Eq, PartialEq, Ord, PartialOrd, Hash, Debug, Default)]
pub struct Keywords {
pub keywords: Vec<&'static str>,
}
impl Keywords {
/// Create a new set of keywords.
///
/// Keywords vector is limited to a maximum of 5 keyword.
///
/// Returns a Keywords instance.
///
/// # Example
///```rust
/// use rtrend::Keywords;
/// let keywords = Keywords::new(vec!["Unicorn","Labradoodle","Pikachu"]);
/// ```
///
/// # Panics
/// A vector of length greater than 5 will panic.
/// ```should_panic
/// # use rtrend::Keywords;
/// let seven_dwarf = vec!["Bashful","Doc", "Dopey","Grumpy","Happy", "Sleepy", "Sneezy"];
/// let keywords = Keywords::new(seven_dwarf);
/// ```
///
/// A vector without keywords will also panic.
/// ```should_panic
/// # use rtrend::Keywords;
/// let keywords = Keywords::new(vec![]);
/// ```
pub fn new(keywords: Vec<&'static str>) -> Self {
Self {
keywords: check_keywords(keywords),
}
}
}
impl From<&'static str> for Keywords {
fn from(item: &'static str) -> Self {
Self {
keywords: check_keywords(item.split(',').collect()),
}
}
}
fn check_keywords(keys: Vec<&'static str>) -> Vec<&'static str> {
if keys.is_empty() {
Err(KeywordMinCapacity).unwrap()
}
if keys.len() > 5 {
Err(KeywordMaxCapacity).unwrap()
}
keys
}
impl Display for Keywords {
fn fmt(&self, f: &mut Formatter) -> Result {
write!(f, "{:#?}", self.keywords)
}
}