X-Git-Url: http://git.scottworley.com/tablify/blobdiff_plain/1f6bd845277daaea2513cc3dc19a0907fe9f6d6c..14e9852b53792c9f575de03d6a4349a00a4320b4:/src/lib.rs
diff --git a/src/lib.rs b/src/lib.rs
index 72a3add..245a47a 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,22 +1,62 @@
-#[cfg(test)]
+use std::collections::{HashMap, HashSet};
use std::io::BufRead;
-#[cfg(test)]
use std::iter::Iterator;
+const HEADER: &str = "
+
+
+
+
+
+
+
+
+
+ ";
+const FOOTER: &str = "
+
+
+";
+
+#[derive(Debug, PartialEq, Eq, Hash)]
+struct Entry(String);
+
#[derive(Debug, PartialEq, Eq)]
struct RowInput {
label: String,
- entries: Vec,
+ entries: Vec,
}
struct Reader>> {
- input: Input,
+ input: std::iter::Enumerate,
row: Option,
}
impl>> Reader {
- #[cfg(test)]
fn new(input: Input) -> Self {
- Self { input, row: None }
+ Self {
+ input: input.enumerate(),
+ row: None,
+ }
}
}
impl>> Iterator for Reader {
@@ -26,19 +66,24 @@ impl>> Iterator for Reader
match self
.input
.next()
- .map(|r| r.map(|line| String::from(line.trim_end())))
+ .map(|(n, r)| (n, r.map(|line| String::from(line.trim_end()))))
{
None => return Ok(std::mem::take(&mut self.row)).transpose(),
- Some(Err(e)) => return Some(Err(e)),
- Some(Ok(line)) if line.is_empty() && self.row.is_some() => {
+ Some((_, Err(e))) => return Some(Err(e)),
+ Some((_, Ok(line))) if line.is_empty() && self.row.is_some() => {
return Ok(std::mem::take(&mut self.row)).transpose()
}
- Some(Ok(line)) if line.is_empty() => {}
- Some(Ok(line)) if line.starts_with(' ') => match &mut self.row {
- None => return Some(Err(std::io::Error::other("Entry with no header"))),
- Some(ref mut row) => row.entries.push(String::from(line.trim())),
+ Some((_, Ok(line))) if line.is_empty() => {}
+ Some((n, Ok(line))) if line.starts_with(' ') => match &mut self.row {
+ None => {
+ return Some(Err(std::io::Error::other(format!(
+ "{}: Entry with no header",
+ n + 1
+ ))))
+ }
+ Some(ref mut row) => row.entries.push(Entry(String::from(line.trim()))),
},
- Some(Ok(line)) => {
+ Some((_, Ok(line))) => {
let prev = std::mem::take(&mut self.row);
self.row = Some(RowInput {
label: line,
@@ -53,13 +98,37 @@ impl>> Iterator for Reader
}
}
-#[cfg(test)]
fn read_rows(input: impl std::io::Read) -> impl Iterator- > {
Reader::new(std::io::BufReader::new(input).lines())
}
-pub fn tablify(_input: &impl std::io::Read) -> String {
- String::from("Hello, world!")
+fn column_counts(rows: &[RowInput]) -> Vec<(usize, String)> {
+ let mut counts: Vec<_> = rows
+ .iter()
+ .flat_map(|r| r.entries.iter().collect::>().into_iter())
+ .fold(HashMap::new(), |mut cs, e| {
+ cs.entry(String::from(&e.0))
+ .and_modify(|n| *n += 1)
+ .or_insert(1);
+ cs
+ })
+ .into_iter()
+ .map(|(col, n)| (n, col))
+ .collect();
+ counts.sort();
+ counts
+}
+
+/// # Errors
+///
+/// Will return `Err` if
+/// * there's an i/o error while reading `input`
+/// * the log has invalid syntax:
+/// * an indented line with no preceding non-indented line
+pub fn tablify(input: impl std::io::Read) -> Result {
+ let rows = read_rows(input).collect::, _>>()?;
+ let _columns = column_counts(&rows);
+ Ok(String::from(HEADER) + "Hello, world!" + FOOTER)
}
#[cfg(test)]
@@ -99,7 +168,7 @@ mod tests {
read_rows(&b"foo\n bar\n"[..]).flatten().collect::>(),
vec![RowInput {
label: String::from("foo"),
- entries: vec![String::from("bar")]
+ entries: vec![Entry(String::from("bar"))]
}]
);
assert_eq!(
@@ -108,7 +177,7 @@ mod tests {
.collect::>(),
vec![RowInput {
label: String::from("foo"),
- entries: vec![String::from("bar"), String::from("baz")]
+ entries: vec![Entry(String::from("bar")), Entry(String::from("baz"))]
}]
);
assert_eq!(
@@ -147,16 +216,44 @@ mod tests {
.collect::>(),
vec![RowInput {
label: String::from("foo"),
- entries: vec![String::from("bar")]
+ entries: vec![Entry(String::from("bar"))]
}]
);
let bad = read_rows(&b" foo"[..]).next().unwrap();
assert!(bad.is_err());
- assert!(format!("{bad:?}").contains("Entry with no header"));
+ assert!(format!("{bad:?}").contains("1: Entry with no header"));
let bad2 = read_rows(&b"foo\n\n bar"[..]).nth(1).unwrap();
assert!(bad2.is_err());
- assert!(format!("{bad2:?}").contains("Entry with no header"));
+ assert!(format!("{bad2:?}").contains("3: Entry with no header"));
+ }
+
+ #[test]
+ fn test_column_counts() {
+ assert_eq!(
+ column_counts(
+ &read_rows(&b"foo\n bar\n baz\n"[..])
+ .collect::, _>>()
+ .unwrap()
+ ),
+ vec![(1, String::from("bar")), (1, String::from("baz"))]
+ );
+ assert_eq!(
+ column_counts(
+ &read_rows(&b"foo\n bar\n baz\nquux\n baz"[..])
+ .collect::, _>>()
+ .unwrap()
+ ),
+ vec![(1, String::from("bar")), (2, String::from("baz"))]
+ );
+ assert_eq!(
+ column_counts(
+ &read_rows(&b"foo\n bar\n bar\n baz\n bar\nquux\n baz"[..])
+ .collect::, _>>()
+ .unwrap()
+ ),
+ vec![(1, String::from("bar")), (2, String::from("baz"))]
+ );
}
}