use std::collections::{HashMap, HashSet};
use std::fmt::Write;
use std::io::BufRead;
use std::iter::Iterator;
const HEADER: &str = "
";
const FOOTER: &str = "
";
#[derive(PartialEq, Eq, Debug)]
pub struct HTML(String);
impl HTML {
fn escape(value: &str) -> HTML {
let mut escaped: String = String::new();
for c in value.chars() {
match c {
'>' => escaped.push_str(">"),
'<' => escaped.push_str("<"),
'\'' => escaped.push_str("'"),
'"' => escaped.push_str("""),
'&' => escaped.push_str("&"),
ok_c => escaped.push(ok_c),
}
}
HTML(escaped)
}
}
impl From<&str> for HTML {
fn from(value: &str) -> HTML {
HTML(String::from(value))
}
}
impl FromIterator for HTML {
fn from_iter(iter: T) -> HTML
where
T: IntoIterator- ,
{
HTML(iter.into_iter().map(|html| html.0).collect::
())
}
}
impl std::fmt::Display for HTML {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
write!(f, "{}", self.0)
}
}
#[derive(Debug, PartialEq, Eq, Hash)]
struct Entry<'a> {
col: &'a str,
instance: Option<&'a str>,
}
impl<'a> From<&'a str> for Entry<'a> {
fn from(value: &'a str) -> Entry<'a> {
match value.split_once(':') {
None => Entry {
col: value,
instance: None,
},
Some((col, instance)) => Entry {
col: col.trim(),
instance: Some(instance.trim()),
},
}
}
}
#[derive(Debug, PartialEq, Eq)]
struct RowInput<'a> {
label: &'a str,
entries: Vec>,
}
struct Reader<'a, Input: Iterator- >> {
input: std::iter::Enumerate
>,
}
impl<'a, Input: Iterator- >> Reader<'a, Input> {
fn new(input: Input) -> Self {
Self {
input: input.enumerate(),
row: None,
}
}
}
impl<'a, Input: Iterator
- >> Iterator for Reader<'a, Input> {
type Item = Result
, std::io::Error>;
fn next(&mut self) -> Option {
loop {
match self
.input
.next()
// TODO: Don't leak
.map(|(n, r)| (n, r.map(|line| String::from(line).leak().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() => {
return Ok(std::mem::take(&mut self.row)).transpose()
}
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::from(line.trim())),
},
Some((_, Ok(line))) => {
let prev = std::mem::take(&mut self.row);
self.row = Some(RowInput {
label: line,
entries: vec![],
});
if prev.is_some() {
return Ok(prev).transpose();
}
}
}
}
}
}
fn read_rows(
input: impl std::io::Read,
) -> impl Iterator- , std::io::Error>> {
Reader::new(std::io::BufReader::new(input).lines())
}
fn column_counts(rows: &[RowInput]) -> Vec<(usize, String)> {
let mut counts: Vec<_> = rows
.iter()
.flat_map(|r| {
r.entries
.iter()
.map(|e| &e.col)
.collect::
>()
.into_iter()
})
.fold(HashMap::new(), |mut cs, col| {
cs.entry(String::from(*col))
.and_modify(|n| *n += 1)
.or_insert(1);
cs
})
.into_iter()
.map(|(col, n)| (n, col))
.collect();
counts.sort_unstable_by(|(an, acol), (bn, bcol)| bn.cmp(an).then(acol.cmp(bcol)));
counts
}
fn column_order(rows: &[RowInput]) -> Vec {
column_counts(rows)
.into_iter()
.map(|(_, col)| col)
.collect()
}
fn render_instance(entry: &Entry) -> HTML {
match &entry.instance {
None => HTML::from("✓"),
Some(instance) => HTML::escape(instance.as_ref()),
}
}
fn render_cell(col: &str, row: &RowInput) -> HTML {
let row_label = HTML::escape(row.label.as_ref());
let col_label = HTML::escape(col);
let entries: Vec<&Entry> = row.entries.iter().filter(|e| e.col == col).collect();
let class = HTML::from(if entries.is_empty() { "" } else { "yes" });
let all_empty = entries.iter().all(|e| e.instance.is_none());
let contents = if entries.is_empty() || (all_empty && entries.len() == 1) {
HTML::from("")
} else if all_empty {
HTML(format!("{}", entries.len()))
} else {
HTML(
entries
.iter()
.map(|i| render_instance(i))
.map(|html| html.0) // Waiting for slice_concat_trait to stabilize
.collect::>()
.join(" "),
)
};
HTML(format!("{contents} "))
}
fn render_row(columns: &[String], row: &RowInput) -> HTML {
// This is O(n^2) & doesn't need to be
let row_label = HTML::escape(row.label.as_ref());
HTML(format!(
"{row_label} {} {
let rows = read_rows(input).collect::, _>>()?;
let columns = column_order(&rows);
Ok(HTML(format!(
"{HEADER}{}{}{FOOTER}",
render_column_headers(&columns),
rows.into_iter()
.map(|r| render_row(&columns, &r))
.collect::()
)))
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_parse_entry() {
assert_eq!(
Entry::from("foo"),
Entry {
col: "foo",
instance: None
}
);
assert_eq!(
Entry::from("foo:bar"),
Entry {
col: "foo",
instance: Some("bar")
}
);
assert_eq!(
Entry::from("foo: bar"),
Entry {
col: "foo",
instance: Some("bar")
}
);
}
#[test]
fn test_read_rows() {
assert_eq!(
read_rows(&b"foo"[..]).flatten().collect::>(),
vec![RowInput {
label: "foo",
entries: vec![]
}]
);
assert_eq!(
read_rows(&b"bar"[..]).flatten().collect::>(),
vec![RowInput {
label: "bar",
entries: vec![]
}]
);
assert_eq!(
read_rows(&b"foo\nbar\n"[..]).flatten().collect::>(),
vec![
RowInput {
label: "foo",
entries: vec![]
},
RowInput {
label: "bar",
entries: vec![]
}
]
);
assert_eq!(
read_rows(&b"foo\n bar\n"[..]).flatten().collect::>(),
vec![RowInput {
label: "foo",
entries: vec![Entry::from("bar")]
}]
);
assert_eq!(
read_rows(&b"foo\n bar\n baz\n"[..])
.flatten()
.collect::>(),
vec![RowInput {
label: "foo",
entries: vec![Entry::from("bar"), Entry::from("baz")]
}]
);
assert_eq!(
read_rows(&b"foo\n\nbar\n"[..])
.flatten()
.collect::>(),
vec![
RowInput {
label: "foo",
entries: vec![]
},
RowInput {
label: "bar",
entries: vec![]
}
]
);
assert_eq!(
read_rows(&b"foo\n \nbar\n"[..])
.flatten()
.collect::>(),
vec![
RowInput {
label: "foo",
entries: vec![]
},
RowInput {
label: "bar",
entries: vec![]
}
]
);
assert_eq!(
read_rows(&b"foo \n bar \n"[..])
.flatten()
.collect::>(),
vec![RowInput {
label: "foo",
entries: vec![Entry::from("bar")]
}]
);
let bad = read_rows(&b" foo"[..]).next().unwrap();
assert!(bad.is_err());
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("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![(2, String::from("baz")), (1, String::from("bar"))]
);
assert_eq!(
column_counts(
&read_rows(&b"foo\n bar\n bar\n baz\n bar\nquux\n baz"[..])
.collect::, _>>()
.unwrap()
),
vec![(2, String::from("baz")), (1, String::from("bar"))]
);
assert_eq!(
column_counts(
&read_rows(&b"foo\n bar: 1\n bar: 2\n baz\n bar\nquux\n baz"[..])
.collect::, _>>()
.unwrap()
),
vec![(2, String::from("baz")), (1, String::from("bar"))]
);
}
#[test]
fn test_render_cell() {
assert_eq!(
render_cell(
"foo",
&RowInput {
label: "nope",
entries: vec![]
}
),
HTML::from("2 ")
);
assert_eq!(
render_cell(
"foo",
&RowInput {
label: "nope",
entries: vec![Entry::from("foo: 5"), Entry::from("foo: 10")]
}
),
HTML::from("5 10 ")
);
assert_eq!(
render_cell(
"foo",
&RowInput {
label: "nope",
entries: vec![Entry::from("foo: 5"), Entry::from("foo")]
}
),
HTML::from("5 ✓ ")
);
assert_eq!(
render_cell(
"heart",
&RowInput {
label: "nope",
entries: vec![Entry::from("heart: <3")]
}
),
HTML::from("<3 ")
);
assert_eq!(
render_cell(
"foo",
&RowInput {
label: "bob's",
entries: vec![Entry::from("foo")]
}
),
HTML::from("