improve ballot parse function

src/ballot.rs

@@ -22,16 +22,7 @@ pub struct Ballot {
 }
 
 impl Ballot {
-	pub fn parse_rows<T: std::io::BufRead>(csv: quick_csv::Csv<T>, header: &Header) -> Result<Vec<Ballot>, Box<dyn std::error::Error>> {
-		let mut ballots = Vec::<Self>::new();
-
-		let col_filter = |(index, place): (usize, &str)| match place.parse::<usize>() {
-			Ok(v) => Some((index, v - 1)),
-			Err(_) => None,
-		};
-
-		for result in csv {
-			let row = result?;
+	pub fn parse(row: quick_csv::Row, header: &Header) -> Result<Ballot, Box<dyn std::error::Error>> {
 		let mut cols = row.columns()?;
 
 		let (state, division, collection_point, collection_point_id, batch_id, paper_id) = cols.next_tuple().ok_or("Missing columns")?;
@@ -39,6 +30,11 @@ impl Ballot {
 		let mut votes: Vec<Option<usize>>;
 		let ty: BallotType;
 
+		let col_filter = |(index, place): (usize, &str)| match place.parse::<usize>() {
+			Ok(v) => Some((index, v - 1)),
+			Err(_) => None,
+		};
+
 		// below the line votes
 		if cols.len() > header.parties.len() {
 			ty = BallotType::Candidate;
@@ -57,7 +53,7 @@ impl Ballot {
 			}
 		}
 
-			ballots.push(Ballot {
+		Ok(Ballot {
 			state: state.to_owned(),
 			division: division.to_owned(),
 			collection_point: collection_point.to_owned(),
@@ -66,10 +62,7 @@ impl Ballot {
 			paper_id: paper_id.parse()?,
 			votes: votes.iter().copied().filter_map(|v| v).collect(),
 			ty,
-			});
-		}
-
-		Ok(ballots)
+		})
 	}
 }
 

src/counter.rs

@@ -10,7 +10,11 @@ pub struct Counter {
 impl Counter {
 	pub fn new<T: std::io::BufRead>(mut csv: quick_csv::Csv<T>) -> Result<Self, Box<dyn std::error::Error>> {
 		let header = Header::parse(csv.next().ok_or("csv header missing")??)?;
-		let ballots = Ballot::parse_rows(csv, &header)?;
+		let mut ballots = Vec::new();
+
+		for row in csv {
+			ballots.push(Ballot::parse(row?, &header)?);
+		}
 
 		Ok(Counter {
 			header,
@@ -18,5 +22,6 @@ impl Counter {
 		})
 	}
 
+
 }
 

src/main.rs

@@ -1,8 +1,7 @@
 use std::env;
 
-use ballot::{Ballot, BallotType};
+use ballot::BallotType;
 use counter::Counter;
-use header::Header;
 
 pub mod candidate;
 pub mod ballot;