git.scottworley.com Git - tablify/blob - src/lib.rs

   1 use std::borrow::ToOwned;
   2 use std::collections::{HashMap, HashSet};
   3 use std::fmt::Write;
   4 use std::io::BufRead;
   5 use std::iter::Iterator;
   6
   7 #[derive(PartialEq, Eq, Debug)]
   8 struct Config {
   9     column_threshold: usize,
  10     static_columns: Vec<Option<String>>,
  11     hidden_columns: HashSet<String>,
  12 }
  13 impl Config {
  14     fn apply_command(&mut self, line_num: usize, cmd: &str) -> Result<(), std::io::Error> {
  15         if let Some(threshold) = cmd.strip_prefix("col_threshold ") {
  16             self.column_threshold = threshold.parse().map_err(|e| {
  17                 std::io::Error::new(
  18                     std::io::ErrorKind::InvalidInput,
  19                     format!("line {line_num}: col_threshold must be numeric: {e}"),
  20                 )
  21             })?;
  22         } else if let Some(col) = cmd.strip_prefix("hide ") {
  23             self.hidden_columns.insert(col.to_owned());
  24         } else if let Some(col) = cmd.strip_prefix("col ") {
  25             self.static_columns.push(Some(col.to_owned()));
  26         } else if cmd == "colsep" {
  27             self.static_columns.push(None);
  28         } else {
  29             return Err(std::io::Error::new(
  30                 std::io::ErrorKind::InvalidInput,
  31                 format!("line {line_num}: Unknown command: {cmd}"),
  32             ));
  33         }
  34         Ok(())
  35     }
  36 }
  37 impl Default for Config {
  38     fn default() -> Self {
  39         Self {
  40             column_threshold: 2,
  41             static_columns: vec![],
  42             hidden_columns: HashSet::new(),
  43         }
  44     }
  45 }
  46
  47 const HEADER: &str = r#"<!DOCTYPE html>
  48 <html>
  49 <head>
  50   <meta charset="utf-8">
  51   <meta name="viewport" content="width=device-width, initial-scale=1">
  52   <style>
  53     td { text-align: center; }
  54     /* h/t https://wabain.github.io/2019/10/13/css-rotated-table-header.html */
  55     th, td { white-space: nowrap; }
  56     th { text-align: left; font-weight: normal; }
  57     th.spacer_row { height: .3em; }
  58     .spacer_col { border: none; width: .2em; }
  59     table { border-collapse: collapse }
  60     tr.key > th { height: 10em; vertical-align: bottom; line-height: 1 }
  61     tr.key > th > div { width: 1em; }
  62     tr.key > th > div > div { width: 5em; transform-origin: bottom left; transform: translateX(1em) rotate(-65deg) }
  63     td { border: thin solid gray; }
  64     td.leftover { text-align: left; border: none; padding-left: .4em; }
  65     td.yes { border: thin solid gray; background-color: #ddd; }
  66     /* h/t https://stackoverflow.com/questions/5687035/css-bolding-some-text-without-changing-its-containers-size/46452396#46452396 */
  67     .highlight { text-shadow: -0.06ex 0 black, 0.06ex 0 black; }
  68   </style>
  69   <script>
  70     function highlight(id)       { const e = document.getElementById(id); if (e) { e.classList.add(   "highlight"); } }
  71     function clear_highlight(id) { const e = document.getElementById(id); if (e) { e.classList.remove("highlight"); } }
  72     function h2(a, b)  {       highlight(a);       highlight(b); }
  73     function ch2(a, b) { clear_highlight(a); clear_highlight(b); }
  74   </script>
  75 </head>
  76 <body>
  77   <table>
  78     <tbody>
  79 "#;
  80 const FOOTER: &str = "    </tbody>
  81   </table>
  82 </body>
  83 </html>";
  84
  85 #[derive(PartialEq, Eq, Debug)]
  86 pub struct HTML(String);
  87 impl HTML {
  88     fn escape(value: &str) -> HTML {
  89         let mut escaped: String = String::new();
  90         for c in value.chars() {
  91             match c {
  92                 '>' => escaped.push_str("&gt;"),
  93                 '<' => escaped.push_str("&lt;"),
  94                 '\'' => escaped.push_str("&#39;"),
  95                 '"' => escaped.push_str("&quot;"),
  96                 '&' => escaped.push_str("&amp;"),
  97                 ok_c => escaped.push(ok_c),
  98             }
  99         }
 100         HTML(escaped)
 101     }
 102 }
 103 impl From<&str> for HTML {
 104     fn from(value: &str) -> HTML {
 105         HTML(String::from(value))
 106     }
 107 }
 108 impl FromIterator<HTML> for HTML {
 109     fn from_iter<T>(iter: T) -> HTML
 110     where
 111         T: IntoIterator<Item = HTML>,
 112     {
 113         HTML(iter.into_iter().map(|html| html.0).collect::<String>())
 114     }
 115 }
 116 impl std::fmt::Display for HTML {
 117     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
 118         write!(f, "{}", self.0)
 119     }
 120 }
 121
 122 #[derive(Debug, PartialEq, Eq)]
 123 enum InputLine<'a> {
 124     Blank,
 125     RowHeader(&'a str),
 126     Entry(&'a str, Option<&'a str>),
 127     Command(&'a str),
 128 }
 129 impl<'a> From<&'a str> for InputLine<'a> {
 130     fn from(value: &'a str) -> InputLine<'a> {
 131         let trimmed = value.trim_end();
 132         if trimmed.is_empty() {
 133             InputLine::Blank
 134         } else if let Some(cmd) = trimmed.strip_prefix('!') {
 135             InputLine::Command(cmd)
 136         } else if !trimmed.starts_with(' ') {
 137             InputLine::RowHeader(value.trim())
 138         } else {
 139             match value.split_once(':') {
 140                 None => InputLine::Entry(value.trim(), None),
 141                 Some((col, instance)) => InputLine::Entry(col.trim(), Some(instance.trim())),
 142             }
 143         }
 144     }
 145 }
 146
 147 #[derive(Debug, PartialEq, Eq)]
 148 struct Row {
 149     label: String,
 150     entries: HashMap<String, Vec<Option<String>>>,
 151 }
 152
 153 #[derive(Debug, PartialEq, Eq)]
 154 enum Rowlike {
 155     Row(Row),
 156     Spacer,
 157 }
 158
 159 struct Reader<'cfg, Input: Iterator<Item = Result<String, std::io::Error>>> {
 160     input: std::iter::Enumerate<Input>,
 161     row: Option<Row>,
 162     config: &'cfg mut Config,
 163 }
 164 impl<'cfg, Input: Iterator<Item = Result<String, std::io::Error>>> Reader<'cfg, Input> {
 165     fn new(config: &'cfg mut Config, input: Input) -> Self {
 166         Self {
 167             input: input.enumerate(),
 168             row: None,
 169             config,
 170         }
 171     }
 172 }
 173 impl<'cfg, Input: Iterator<Item = Result<String, std::io::Error>>> Iterator
 174     for Reader<'cfg, Input>
 175 {
 176     type Item = Result<Rowlike, std::io::Error>;
 177     fn next(&mut self) -> Option<Self::Item> {
 178         loop {
 179             match self.input.next() {
 180                 None => return Ok(std::mem::take(&mut self.row).map(Rowlike::Row)).transpose(),
 181                 Some((_, Err(e))) => return Some(Err(e)),
 182                 Some((n, Ok(line))) => match InputLine::from(line.as_ref()) {
 183                     InputLine::Command(cmd) => {
 184                         if let Err(e) = self.config.apply_command(n + 1, cmd) {
 185                             return Some(Err(e));
 186                         }
 187                     }
 188                     InputLine::Blank if self.row.is_some() => {
 189                         return Ok(std::mem::take(&mut self.row).map(Rowlike::Row)).transpose()
 190                     }
 191                     InputLine::Blank => return Some(Ok(Rowlike::Spacer)),
 192                     InputLine::Entry(col, instance) => match &mut self.row {
 193                         None => {
 194                             return Some(Err(std::io::Error::other(format!(
 195                                 "line {}: Entry with no header",
 196                                 n + 1
 197                             ))))
 198                         }
 199                         Some(ref mut row) => {
 200                             row.entries
 201                                 .entry(col.to_owned())
 202                                 .and_modify(|is| is.push(instance.map(ToOwned::to_owned)))
 203                                 .or_insert_with(|| vec![instance.map(ToOwned::to_owned)]);
 204                         }
 205                     },
 206                     InputLine::RowHeader(row) => {
 207                         let prev = std::mem::take(&mut self.row);
 208                         self.row = Some(Row {
 209                             label: row.to_owned(),
 210                             entries: HashMap::new(),
 211                         });
 212                         if prev.is_some() {
 213                             return Ok(prev.map(Rowlike::Row)).transpose();
 214                         }
 215                     }
 216                 },
 217             }
 218         }
 219     }
 220 }
 221
 222 fn read_input(input: impl std::io::Read) -> Result<(Vec<Rowlike>, Config), std::io::Error> {
 223     let mut config = Config::default();
 224     let reader = Reader::new(&mut config, std::io::BufReader::new(input).lines());
 225     reader
 226         .collect::<Result<Vec<_>, _>>()
 227         .map(|rows| (rows, config))
 228 }
 229
 230 fn column_counts(rows: &[Rowlike]) -> Vec<(usize, String)> {
 231     let empty = HashMap::new();
 232     let mut counts: Vec<_> = rows
 233         .iter()
 234         .flat_map(|rl| match rl {
 235             Rowlike::Row(r) => r.entries.keys(),
 236             Rowlike::Spacer => empty.keys(),
 237         })
 238         .fold(HashMap::new(), |mut cs, col| {
 239             cs.entry(col.to_owned())
 240                 .and_modify(|n| *n += 1)
 241                 .or_insert(1);
 242             cs
 243         })
 244         .into_iter()
 245         .map(|(col, n)| (n, col))
 246         .collect();
 247     counts.sort_unstable_by(|(an, acol), (bn, bcol)| bn.cmp(an).then(acol.cmp(bcol)));
 248     counts
 249 }
 250 fn column_order(config: &Config, rows: &[Rowlike]) -> Vec<String> {
 251     let static_columns: HashSet<&str> = config
 252         .static_columns
 253         .iter()
 254         .flatten()
 255         .map(std::string::String::as_str)
 256         .collect();
 257     column_counts(rows)
 258         .into_iter()
 259         .filter_map(|(n, col)| {
 260             (n >= config.column_threshold
 261                 && !static_columns.contains(col.as_str())
 262                 && !config.hidden_columns.contains(&col))
 263             .then_some(col)
 264         })
 265         .collect()
 266 }
 267
 268 fn render_one_instance(instance: &Option<String>) -> HTML {
 269     match instance {
 270         None => HTML::from("✓"),
 271         Some(instance) => HTML::escape(instance.as_ref()),
 272     }
 273 }
 274
 275 fn render_instances(instances: &[Option<String>]) -> HTML {
 276     let all_empty = instances.iter().all(Option::is_none);
 277     if all_empty && instances.len() == 1 {
 278         HTML::from("")
 279     } else if all_empty {
 280         HTML(format!("{}", instances.len()))
 281     } else {
 282         HTML(
 283             instances
 284                 .iter()
 285                 .map(render_one_instance)
 286                 .map(|html| html.0) // Waiting for slice_concat_trait to stabilize
 287                 .collect::<Vec<_>>()
 288                 .join(" "),
 289         )
 290     }
 291 }
 292
 293 fn render_cell(col: &str, row: &mut Row) -> HTML {
 294     let row_label = HTML::escape(row.label.as_ref());
 295     let col_label = HTML::escape(col);
 296     let instances: Option<&Vec<Option<String>>> = row.entries.get(col);
 297     let class = HTML::from(if instances.is_none() { "" } else { "yes" });
 298     let contents = match instances {
 299         None => HTML::from(""),
 300         Some(is) => render_instances(is),
 301     };
 302     row.entries.remove(col);
 303     HTML(format!(
 304         r#"<td class="{class}" onmouseover="h2('{row_label}','{col_label}')" onmouseout="ch2('{row_label}','{col_label}')">{contents}</td>"#
 305     ))
 306 }
 307
 308 fn render_leftover(notcol: &str, instances: &[Option<String>]) -> HTML {
 309     let label = HTML::escape(notcol);
 310     let rest = render_instances(instances);
 311     if rest == HTML::from("") {
 312         HTML(format!("{label}"))
 313     } else {
 314         HTML(format!("{label}: {rest}"))
 315     }
 316 }
 317
 318 fn render_all_leftovers(config: &Config, row: &Row) -> HTML {
 319     let mut order: Vec<_> = row
 320         .entries
 321         .keys()
 322         .filter(|&col| !config.hidden_columns.contains(col))
 323         .collect();
 324     order.sort_unstable();
 325     HTML(
 326         order
 327             .into_iter()
 328             .map(|notcol| render_leftover(notcol, row.entries.get(notcol).expect("Key vanished?!")))
 329             .map(|html| html.0) // Waiting for slice_concat_trait to stabilize
 330             .collect::<Vec<_>>()
 331             .join(", "),
 332     )
 333 }
 334
 335 fn render_row(config: &Config, columns: &[String], rowlike: &mut Rowlike) -> HTML {
 336     match rowlike {
 337         Rowlike::Spacer => HTML::from("<tr><th class=\"spacer_row\"></th></tr>\n"),
 338         Rowlike::Row(row) => {
 339             let row_label = HTML::escape(row.label.as_ref());
 340             let static_cells = config
 341                 .static_columns
 342                 .iter()
 343                 .map(|ocol| match ocol {
 344                     Some(col) if config.hidden_columns.contains(col) => HTML::from(""),
 345                     Some(col) => render_cell(col, row),
 346                     None => HTML::from(r#"<td class="spacer_col"></td>"#),
 347                 })
 348                 .collect::<HTML>();
 349             let dynamic_cells = columns
 350                 .iter()
 351                 .filter(|&col| !config.hidden_columns.contains(col))
 352                 .map(|col| render_cell(col, row))
 353                 .collect::<HTML>();
 354             let leftovers = render_all_leftovers(config, row);
 355             HTML(format!(
 356                 "<tr><th id=\"{row_label}\">{row_label}</th>{static_cells}{dynamic_cells}<td class=\"leftover\" onmouseover=\"highlight('{row_label}')\" onmouseout=\"clear_highlight('{row_label}')\">{leftovers}</td></tr>\n"
 357             ))
 358         }
 359     }
 360 }
 361
 362 fn column_header_order<'a>(
 363     config: &'a Config,
 364     columns: &'a [String],
 365 ) -> impl Iterator<Item = Option<&'a String>> {
 366     let static_columns = config.static_columns.iter().map(|oc| oc.as_ref());
 367     let dynamic_columns = columns.iter().map(Some);
 368     static_columns.chain(dynamic_columns).filter(|ocol| {
 369         ocol.map_or(true, |col| !config.hidden_columns.contains(col))
 370     })
 371 }
 372
 373 fn render_column_headers(config: &Config, columns: &[String]) -> HTML {
 374     HTML(
 375         String::from(r#"<tr class="key"><th></th>"#)
 376             + &column_header_order(config, columns).fold(String::new(), |mut acc, ocol| {
 377                 match ocol {
 378                     Some(col) => {
 379                         let col_header = HTML::escape(col);
 380                         write!(
 381                             &mut acc,
 382                             r#"<th id="{col_header}"><div><div>{col_header}</div></div></th>"#
 383                         )
 384                     }
 385                     None => write!(&mut acc, r#"<th class="col_spacer"></th>"#),
 386                 }
 387                 .unwrap();
 388                 acc
 389             })
 390             + "</tr>\n",
 391     )
 392 }
 393
 394 /// # Errors
 395 ///
 396 /// Will return `Err` if
 397 ///   * there's an i/o error while reading `input`
 398 ///   * the log has invalid syntax:
 399 ///     * an indented line with no preceding non-indented line
 400 pub fn tablify(input: impl std::io::Read) -> Result<HTML, std::io::Error> {
 401     let (rows, config) = read_input(input)?;
 402     let columns = column_order(&config, &rows);
 403     Ok(HTML(format!(
 404         "{HEADER}{}{}{FOOTER}",
 405         render_column_headers(&config, &columns),
 406         rows.into_iter()
 407             .map(|mut r| render_row(&config, &columns, &mut r))
 408             .collect::<HTML>()
 409     )))
 410 }
 411
 412 #[cfg(test)]
 413 mod tests {
 414     use super::*;
 415
 416     #[test]
 417     fn test_parse_line() {
 418         assert_eq!(InputLine::from(""), InputLine::Blank);
 419         assert_eq!(InputLine::from(" "), InputLine::Blank);
 420         assert_eq!(InputLine::from("foo"), InputLine::RowHeader("foo"));
 421         assert_eq!(InputLine::from("foo "), InputLine::RowHeader("foo"));
 422         assert_eq!(InputLine::from(" foo"), InputLine::Entry("foo", None));
 423         assert_eq!(
 424             InputLine::from(" foo:bar"),
 425             InputLine::Entry("foo", Some("bar"))
 426         );
 427         assert_eq!(
 428             InputLine::from(" foo: bar"),
 429             InputLine::Entry("foo", Some("bar"))
 430         );
 431         assert_eq!(
 432             InputLine::from(" foo: bar "),
 433             InputLine::Entry("foo", Some("bar"))
 434         );
 435         assert_eq!(
 436             InputLine::from(" foo:  bar "),
 437             InputLine::Entry("foo", Some("bar"))
 438         );
 439         assert_eq!(
 440             InputLine::from(" foo :  bar "),
 441             InputLine::Entry("foo", Some("bar"))
 442         );
 443     }
 444
 445     fn read_rows(input: impl std::io::Read) -> Result<Vec<Rowlike>, std::io::Error> {
 446         read_input(input).map(|(rows, _)| rows)
 447     }
 448     fn read_config(input: impl std::io::Read) -> Result<Config, std::io::Error> {
 449         read_input(input).map(|(_, config)| config)
 450     }
 451     #[test]
 452     fn test_read_rows() {
 453         assert_eq!(
 454             read_rows(&b"foo"[..]).unwrap(),
 455             vec![Rowlike::Row(Row {
 456                 label: "foo".to_owned(),
 457                 entries: HashMap::new(),
 458             })]
 459         );
 460         assert_eq!(
 461             read_rows(&b"bar"[..]).unwrap(),
 462             vec![Rowlike::Row(Row {
 463                 label: "bar".to_owned(),
 464                 entries: HashMap::new(),
 465             })]
 466         );
 467         assert_eq!(
 468             read_rows(&b"foo\nbar\n"[..]).unwrap(),
 469             vec![
 470                 Rowlike::Row(Row {
 471                     label: "foo".to_owned(),
 472                     entries: HashMap::new(),
 473                 }),
 474                 Rowlike::Row(Row {
 475                     label: "bar".to_owned(),
 476                     entries: HashMap::new(),
 477                 })
 478             ]
 479         );
 480         assert_eq!(
 481             read_rows(&b"foo\n bar\n"[..]).unwrap(),
 482             vec![Rowlike::Row(Row {
 483                 label: "foo".to_owned(),
 484                 entries: HashMap::from([("bar".to_owned(), vec![None])]),
 485             })]
 486         );
 487         assert_eq!(
 488             read_rows(&b"foo\n bar\n baz\n"[..]).unwrap(),
 489             vec![Rowlike::Row(Row {
 490                 label: "foo".to_owned(),
 491                 entries: HashMap::from([
 492                     ("bar".to_owned(), vec![None]),
 493                     ("baz".to_owned(), vec![None])
 494                 ]),
 495             })]
 496         );
 497         assert_eq!(
 498             read_rows(&b"foo\n\nbar\n"[..]).unwrap(),
 499             vec![
 500                 Rowlike::Row(Row {
 501                     label: "foo".to_owned(),
 502                     entries: HashMap::new(),
 503                 }),
 504                 Rowlike::Row(Row {
 505                     label: "bar".to_owned(),
 506                     entries: HashMap::new(),
 507                 })
 508             ]
 509         );
 510         assert_eq!(
 511             read_rows(&b"foo\n\n\nbar\n"[..]).unwrap(),
 512             vec![
 513                 Rowlike::Row(Row {
 514                     label: "foo".to_owned(),
 515                     entries: HashMap::new(),
 516                 }),
 517                 Rowlike::Spacer,
 518                 Rowlike::Row(Row {
 519                     label: "bar".to_owned(),
 520                     entries: HashMap::new(),
 521                 })
 522             ]
 523         );
 524         assert_eq!(
 525             read_rows(&b"foo\n \nbar\n"[..]).unwrap(),
 526             vec![
 527                 Rowlike::Row(Row {
 528                     label: "foo".to_owned(),
 529                     entries: HashMap::new(),
 530                 }),
 531                 Rowlike::Row(Row {
 532                     label: "bar".to_owned(),
 533                     entries: HashMap::new(),
 534                 })
 535             ]
 536         );
 537         assert_eq!(
 538             read_rows(&b"foo  \n bar  \n"[..]).unwrap(),
 539             vec![Rowlike::Row(Row {
 540                 label: "foo".to_owned(),
 541                 entries: HashMap::from([("bar".to_owned(), vec![None])]),
 542             })]
 543         );
 544
 545         let bad = read_rows(&b" foo"[..]);
 546         assert!(bad.is_err());
 547         assert!(format!("{bad:?}").contains("line 1: Entry with no header"));
 548
 549         let bad2 = read_rows(&b"foo\n\n bar"[..]);
 550         assert!(bad2.is_err());
 551         assert!(format!("{bad2:?}").contains("line 3: Entry with no header"));
 552     }
 553
 554     #[test]
 555     fn test_read_config() {
 556         assert_eq!(
 557             read_config(&b"!col_threshold 10"[..])
 558                 .unwrap()
 559                 .column_threshold,
 560             10
 561         );
 562         assert_eq!(
 563             read_config(&b"!col foo"[..]).unwrap().static_columns,
 564             vec![Some("foo".to_owned())]
 565         );
 566
 567         let bad_command = read_config(&b"!no such command"[..]);
 568         assert!(bad_command.is_err());
 569         assert!(format!("{bad_command:?}").contains("line 1: Unknown command"));
 570
 571         let bad_num = read_config(&b"!col_threshold foo"[..]);
 572         assert!(bad_num.is_err());
 573         assert!(format!("{bad_num:?}").contains("line 1: col_threshold must be numeric"));
 574     }
 575
 576     #[test]
 577     fn test_column_counts() {
 578         assert_eq!(
 579             column_counts(&read_rows(&b"foo\n bar\n baz\n"[..]).unwrap()),
 580             vec![(1, String::from("bar")), (1, String::from("baz"))]
 581         );
 582         assert_eq!(
 583             column_counts(&read_rows(&b"foo\n bar\n baz\nquux\n baz"[..]).unwrap()),
 584             vec![(2, String::from("baz")), (1, String::from("bar"))]
 585         );
 586         assert_eq!(
 587             column_counts(&read_rows(&b"foo\n bar\n bar\n baz\n bar\nquux\n baz"[..]).unwrap()),
 588             vec![(2, String::from("baz")), (1, String::from("bar"))]
 589         );
 590         assert_eq!(
 591             column_counts(
 592                 &read_rows(&b"foo\n bar: 1\n bar: 2\n baz\n bar\nquux\n baz"[..]).unwrap()
 593             ),
 594             vec![(2, String::from("baz")), (1, String::from("bar"))]
 595         );
 596     }
 597
 598     #[test]
 599     fn test_render_cell() {
 600         assert_eq!(
 601             render_cell(
 602                 "foo",
 603                 &mut Row {
 604                     label: "nope".to_owned(),
 605                     entries: HashMap::new(),
 606                 }
 607             ),
 608             HTML::from(
 609                 r#"<td class="" onmouseover="h2('nope','foo')" onmouseout="ch2('nope','foo')"></td>"#
 610             )
 611         );
 612         assert_eq!(
 613             render_cell(
 614                 "foo",
 615                 &mut Row {
 616                     label: "nope".to_owned(),
 617                     entries: HashMap::from([("bar".to_owned(), vec![None])]),
 618                 }
 619             ),
 620             HTML::from(
 621                 r#"<td class="" onmouseover="h2('nope','foo')" onmouseout="ch2('nope','foo')"></td>"#
 622             )
 623         );
 624         assert_eq!(
 625             render_cell(
 626                 "foo",
 627                 &mut Row {
 628                     label: "nope".to_owned(),
 629                     entries: HashMap::from([("foo".to_owned(), vec![None])]),
 630                 }
 631             ),
 632             HTML::from(
 633                 r#"<td class="yes" onmouseover="h2('nope','foo')" onmouseout="ch2('nope','foo')"></td>"#
 634             )
 635         );
 636         assert_eq!(
 637             render_cell(
 638                 "foo",
 639                 &mut Row {
 640                     label: "nope".to_owned(),
 641                     entries: HashMap::from([("foo".to_owned(), vec![None, None])]),
 642                 }
 643             ),
 644             HTML::from(
 645                 r#"<td class="yes" onmouseover="h2('nope','foo')" onmouseout="ch2('nope','foo')">2</td>"#
 646             )
 647         );
 648         assert_eq!(
 649             render_cell(
 650                 "foo",
 651                 &mut Row {
 652                     label: "nope".to_owned(),
 653                     entries: HashMap::from([(
 654                         "foo".to_owned(),
 655                         vec![Some("5".to_owned()), Some("10".to_owned())]
 656                     )]),
 657                 }
 658             ),
 659             HTML::from(
 660                 r#"<td class="yes" onmouseover="h2('nope','foo')" onmouseout="ch2('nope','foo')">5 10</td>"#
 661             )
 662         );
 663         assert_eq!(
 664             render_cell(
 665                 "foo",
 666                 &mut Row {
 667                     label: "nope".to_owned(),
 668                     entries: HashMap::from([("foo".to_owned(), vec![Some("5".to_owned()), None])]),
 669                 }
 670             ),
 671             HTML::from(
 672                 r#"<td class="yes" onmouseover="h2('nope','foo')" onmouseout="ch2('nope','foo')">5 ✓</td>"#
 673             )
 674         );
 675         assert_eq!(
 676             render_cell(
 677                 "heart",
 678                 &mut Row {
 679                     label: "nope".to_owned(),
 680                     entries: HashMap::from([("heart".to_owned(), vec![Some("<3".to_owned())])]),
 681                 }
 682             ),
 683             HTML::from(
 684                 r#"<td class="yes" onmouseover="h2('nope','heart')" onmouseout="ch2('nope','heart')">&lt;3</td>"#
 685             )
 686         );
 687         assert_eq!(
 688             render_cell(
 689                 "foo",
 690                 &mut Row {
 691                     label: "bob's".to_owned(),
 692                     entries: HashMap::from([("foo".to_owned(), vec![None])]),
 693                 }
 694             ),
 695             HTML::from(
 696                 r#"<td class="yes" onmouseover="h2('bob&#39;s','foo')" onmouseout="ch2('bob&#39;s','foo')"></td>"#
 697             )
 698         );
 699         let mut r = Row {
 700             label: "nope".to_owned(),
 701             entries: HashMap::from([
 702                 ("foo".to_owned(), vec![None]),
 703                 ("baz".to_owned(), vec![None]),
 704             ]),
 705         };
 706         assert_eq!(r.entries.len(), 2);
 707         render_cell("foo", &mut r);
 708         assert_eq!(r.entries.len(), 1);
 709         render_cell("bar", &mut r);
 710         assert_eq!(r.entries.len(), 1);
 711         render_cell("baz", &mut r);
 712         assert_eq!(r.entries.len(), 0);
 713     }
 714
 715     #[test]
 716     fn test_render_leftovers() {
 717         assert_eq!(
 718             render_all_leftovers(
 719                 &Config::default(),
 720                 &Row {
 721                     label: "nope".to_owned(),
 722                     entries: HashMap::from([("foo".to_owned(), vec![None])]),
 723                 }
 724             ),
 725             HTML::from("foo")
 726         );
 727         assert_eq!(
 728             render_all_leftovers(
 729                 &Config::default(),
 730                 &Row {
 731                     label: "nope".to_owned(),
 732                     entries: HashMap::from([
 733                         ("foo".to_owned(), vec![None]),
 734                         ("bar".to_owned(), vec![None])
 735                     ]),
 736                 }
 737             ),
 738             HTML::from("bar, foo")
 739         );
 740         assert_eq!(
 741             render_all_leftovers(
 742                 &Config::default(),
 743                 &Row {
 744                     label: "nope".to_owned(),
 745                     entries: HashMap::from([
 746                         ("foo".to_owned(), vec![None]),
 747                         ("bar".to_owned(), vec![None, None])
 748                     ]),
 749                 }
 750             ),
 751             HTML::from("bar: 2, foo")
 752         );
 753         assert_eq!(
 754             render_all_leftovers(
 755                 &Config {
 756                     column_threshold: 2,
 757                     static_columns: vec![],
 758                     hidden_columns: HashSet::from(["private".to_owned()]),
 759                 },
 760                 &Row {
 761                     label: "nope".to_owned(),
 762                     entries: HashMap::from([("private".to_owned(), vec![None]),]),
 763                 }
 764             ),
 765             HTML::from("")
 766         );
 767     }
 768
 769     #[test]
 770     fn test_render_row() {
 771         assert_eq!(
 772             render_row(
 773                 &Config::default(),
 774                 &["foo".to_owned()],
 775                 &mut Rowlike::Row(Row {
 776                     label: "nope".to_owned(),
 777                     entries: HashMap::from([("bar".to_owned(), vec![None])]),
 778                 })
 779             ),
 780             HTML::from(
 781                 r#"<tr><th id="nope">nope</th><td class="" onmouseover="h2('nope','foo')" onmouseout="ch2('nope','foo')"></td><td class="leftover" onmouseover="highlight('nope')" onmouseout="clear_highlight('nope')">bar</td></tr>
 782 "#
 783             )
 784         );
 785         assert_eq!(
 786             render_row(
 787                 &Config {
 788                     column_threshold: 0,
 789                     static_columns: vec![Some("foo".to_owned()), Some("bar".to_owned())],
 790                     hidden_columns: HashSet::new(),
 791                 },
 792                 &["baz".to_owned()],
 793                 &mut Rowlike::Row(Row {
 794                     label: "nope".to_owned(),
 795                     entries: HashMap::from([
 796                         ("bar".to_owned(), vec![Some("r".to_owned())]),
 797                         ("baz".to_owned(), vec![Some("z".to_owned())]),
 798                         ("foo".to_owned(), vec![Some("f".to_owned())]),
 799                     ]),
 800                 })
 801             ),
 802             HTML::from(
 803                 r#"<tr><th id="nope">nope</th><td class="yes" onmouseover="h2('nope','foo')" onmouseout="ch2('nope','foo')">f</td><td class="yes" onmouseover="h2('nope','bar')" onmouseout="ch2('nope','bar')">r</td><td class="yes" onmouseover="h2('nope','baz')" onmouseout="ch2('nope','baz')">z</td><td class="leftover" onmouseover="highlight('nope')" onmouseout="clear_highlight('nope')"></td></tr>
 804 "#
 805             )
 806         );
 807         assert_eq!(
 808             render_row(
 809                 &Config {
 810                     column_threshold: 0,
 811                     static_columns: vec![Some("foo".to_owned()), None, Some("bar".to_owned())],
 812                     hidden_columns: HashSet::new(),
 813                 },
 814                 &[],
 815                 &mut Rowlike::Row(Row {
 816                     label: "nope".to_owned(),
 817                     entries: HashMap::from([
 818                         ("bar".to_owned(), vec![Some("r".to_owned())]),
 819                         ("foo".to_owned(), vec![Some("f".to_owned())]),
 820                     ]),
 821                 })
 822             ),
 823             HTML::from(
 824                 r#"<tr><th id="nope">nope</th><td class="yes" onmouseover="h2('nope','foo')" onmouseout="ch2('nope','foo')">f</td><td class="spacer_col"></td><td class="yes" onmouseover="h2('nope','bar')" onmouseout="ch2('nope','bar')">r</td><td class="leftover" onmouseover="highlight('nope')" onmouseout="clear_highlight('nope')"></td></tr>
 825 "#
 826             )
 827         );
 828         assert_eq!(
 829             render_row(
 830                 &Config {
 831                     column_threshold: 0,
 832                     static_columns: vec![],
 833                     hidden_columns: HashSet::from(["foo".to_owned()]),
 834                 },
 835                 &[],
 836                 &mut Rowlike::Row(Row {
 837                     label: "nope".to_owned(),
 838                     entries: HashMap::from([("foo".to_owned(), vec![Some("f".to_owned())]),]),
 839                 })
 840             ),
 841             HTML::from(
 842                 r#"<tr><th id="nope">nope</th><td class="leftover" onmouseover="highlight('nope')" onmouseout="clear_highlight('nope')"></td></tr>
 843 "#
 844             )
 845         );
 846         assert_eq!(
 847             render_row(
 848                 &Config {
 849                     column_threshold: 0,
 850                     static_columns: vec![Some("foo".to_owned())],
 851                     hidden_columns: HashSet::from(["foo".to_owned()]),
 852                 },
 853                 &[],
 854                 &mut Rowlike::Row(Row {
 855                     label: "nope".to_owned(),
 856                     entries: HashMap::from([("foo".to_owned(), vec![Some("f".to_owned())]),]),
 857                 })
 858             ),
 859             HTML::from(
 860                 r#"<tr><th id="nope">nope</th><td class="leftover" onmouseover="highlight('nope')" onmouseout="clear_highlight('nope')"></td></tr>
 861 "#
 862             )
 863         );
 864     }
 865 }