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use chrono::{prelude::Local, NaiveDateTime};
use std::{fmt, str::FromStr, string::ParseError};
use vader_sentiment::SentimentIntensityAnalyzer;
use crate::Sentiment;
#[derive(Clone, Debug)]
pub struct Entry {
pub text: String,
pub timestamp: NaiveDateTime,
sentiment: Sentiment,
dt_format: String,
}
impl Entry {
pub fn new(text: String, dt_fmt: &str) -> Entry {
let dt_format = dt_fmt.to_string();
let score = Entry::calculate_sentiment(&text);
let sentiment = Sentiment::new(score);
Entry {
text,
timestamp: Local::now().naive_local(),
sentiment,
dt_format,
}
}
pub fn replace_text(&mut self, text: &str) {
self.text.clear();
self.text.push_str(text);
}
fn calculate_sentiment(text: &str) -> f64 {
let analyzer = SentimentIntensityAnalyzer::new();
let scores = analyzer.polarity_scores(text);
*scores.get("compound").unwrap()
}
}
impl FromStr for Entry {
type Err = ParseError;
fn from_str(s: &str) -> Result<Self, Self::Err> {
let e: Vec<&str> = s.split("---").collect();
let header: Vec<&str> = e[0].trim().split('\n').collect();
let compound: f64 = header[1].split('≅').collect::<Vec<&str>>()[0][5..]
.trim()
.parse()
.unwrap();
Ok(Entry {
text: e[1].trim().into(),
timestamp: NaiveDateTime::parse_from_str(
header[0].split_at(4).1,
"%A %e %B, %Y - %H:%M",
)
.unwrap(),
dt_format: "%A %e %B, %Y - %H:%M".to_string(),
sentiment: { Sentiment::new(compound) },
})
}
}
impl fmt::Display for Entry {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(
f,
"### {}\n#### {}\n---\n\n{}\n\n¶\n",
self.timestamp.format(&self.dt_format),
self.sentiment,
self.text
)
}
}
#[cfg(test)]
mod test_entry {
use super::*;
#[test]
fn test_entry_text() {
let e = Entry::new("Testing this entry".into(), "%A %e %B, %Y - %H:%M");
assert_eq!(e.text, "Testing this entry");
}
#[test]
fn test_sentiment_positive() {
let e = Entry::new(
"This is amazing and should have a really high and awesome compound sentiment!".into(),
"%A %e %B, %Y - %H:%M",
);
assert_eq!(e.sentiment.compound, 0.86732358124633);
}
#[test]
fn test_sentiment_negative() {
let e = Entry::new(
"This is awful and should have a really low and terrible compound sentiment!".into(),
"%A %e %B, %Y - %H:%M",
);
assert_eq!(e.sentiment.compound, -0.8157728811846393);
}
#[test]
fn test_replace_text() {
let mut e = Entry::new(
"Going to replace some words in this.".into(),
"%A %e %B, %Y - %H:%M",
);
e.replace_text("Replaced some words.");
assert_eq!(e.text, "Replaced some words.");
}
}