Skip to main content

max / makeover-webview

98.5 KB · 2326 lines History Blame Raw
1 //! Phase B, the forms half: [`makeover_layout::Field`] rendered to HTML.
2 //!
3 //! # Why this emits strings
4 //!
5 //! Both webview apps build their markup as strings and hand it to `innerHTML`:
6 //! goingson's `renderFormField` returns a template literal that fifteen call
7 //! sites interpolate into larger literals, and Balanced Breakfast's builds
8 //! nodes but appends them into the same string-built forms. Returning nodes
9 //! would rewrite the surrounding templates as well, which makes it a migration
10 //! rather than an adoption. So: strings, and the escaping comes with them.
11 //!
12 //! # Why one escaper is enough here
13 //!
14 //! goingson carries four escapers and 543 call sites that must pick between
15 //! them, because `escapeHtml` is built on `textContent` serialization and
16 //! **`textContent` refuses to encode `"`**. That is what makes it unsound in an
17 //! attribute, and it is the whole reason the choice exists. Its `escape.js`
18 //! records the finding as the CHRONIC-XSS seal, and its test suite has a gate
19 //! keeping the unsafe one off the namespace.
20 //!
21 //! [`escape`] here is not built on that, so it encodes the quote along with
22 //! everything else, which makes one function sound in both sinks. The four-way
23 //! choice does not move into Rust: it disappears. Nothing in this module hands
24 //! an unescaped value to the output except through [`Markup`], which a caller
25 //! has to name.
26 //!
27 //! # What the description does not carry
28 //!
29 //! One thing: the **current value**, which arrives in [`Filling`].
30 //!
31 //! It used to be three. Writing this emitter is what found them, and the other
32 //! two turned out not to be renderer state at all — the placeholder is
33 //! user-facing text that sits with `label` and `hint`, and a select's options
34 //! are needed by every renderer, which is how each of them ends up inventing a
35 //! near-miss of the same struct. Both moved down into `makeover-layout` 0.8.0,
36 //! `Choice` included, and this crate reads them off [`Field`] now.
37 //!
38 //! The value stays, and it is not a leftover. A webview reads it back out of
39 //! the DOM, an immediate-mode renderer writes through a `&mut`, and a terminal
40 //! keeps an edit buffer; a description carrying it would have to carry a way to
41 //! write it back, at which point it is a form model.
42
43 use crate::{Emit, class, push_class};
44 use makeover_layout::{Choice, Depth, Field, FieldKind, Intent as _, Selector, Tone};
45 use std::fmt::Write as _;
46
47 /// Every class this module can put in markup.
48 ///
49 /// [`crate::facet::FACET_CLASSES`]' obligation, and the module where it was
50 /// missing longest. Most of these carry no rule and never will: `.form-group`,
51 /// `.form-label`, `.form-hint` and `.form-error` are the apps' own names, kept
52 /// so adoption deletes goingson's `renderFormField` rather than restyling
53 /// anything, and phase A emits only what it can generate from the description.
54 /// A class with no rule is invisible to [`crate::vocabulary::vocabulary`],
55 /// which reads the generated sheet, so the unruled half of a renderer's
56 /// vocabulary can only be written down.
57 ///
58 /// What went wrong without it: an app checking its stylesheet against
59 /// [`crate::vocabulary::names`] concluded that its live `.form-group` and
60 /// `.form-label` rules matched nothing and were safe to delete. quasi-webview
61 /// carried them in a `MAKEOVER_UNLISTED` constant of its own until 0.59.0
62 /// rather than let that happen.
63 pub const FIELD_CLASSES: &[&str] = &[
64 "field",
65 "form-checkbox-label",
66 "form-editor-modes",
67 "form-editor-preview",
68 "form-error",
69 "form-group",
70 "form-hint",
71 "form-interval",
72 "form-label",
73 "form-note",
74 "form-option-reason",
75 "form-radio-group",
76 "form-radio-label",
77 "form-unit",
78 ];
79
80 // `form-suggestions`, `form-suggestion` and `form-suggestion-detail` are
81 // deliberately absent: [`suggestion_rules`] writes their look and
82 // `quasi-webview` writes their markup, because a suggestion source is a route
83 // and no description layer carries one. They reach the vocabulary through the
84 // generated sheet, which is where a name this crate rules but does not emit
85 // belongs.
86
87 /// The state classes a field carries, which take no prefix.
88 ///
89 /// `chosen` and `latched`'s convention, stated in
90 /// [`crate::vocabulary::vocabulary`]: a state qualifies a prefixed component
91 /// (`.mk-form-group.has-error`) rather than standing on its own, so a prefix
92 /// moves the thing and not its state.
93 ///
94 /// `has-error` marks the group and `visible` marks the message, which is
95 /// [`makeover_layout::Field::invalid`]'s own reasoning: a renderer with no
96 /// descendant selectors cannot find the group from the message, so both are
97 /// told.
98 pub const FIELD_STATE_CLASSES: &[&str] = &["has-error", "visible"];
99
100 /// A string that is already markup, and is emitted without escaping.
101 ///
102 /// The one hole in the escaping, and it has to be named to be used. goingson
103 /// has two live callers that need it, both passing a recurrence-config block
104 /// built elsewhere, and both would otherwise have their markup rendered as
105 /// visible angle brackets. A caller constructing this is stating that the
106 /// contents are trusted; nothing here can check that for them.
107 #[derive(Debug, Clone, Copy, PartialEq, Eq)]
108 pub struct Markup<'a>(pub &'a str);
109
110 /// What the field currently holds.
111 ///
112 /// An enum rather than a bag of optional fields, on the same reasoning
113 /// [`makeover_layout::Depth`] is one: a checkbox holding a string is unsayable
114 /// here, where a struct would let it be said and then have to cope.
115 #[derive(Debug, Clone, Copy, PartialEq, Eq, Default)]
116 pub enum Value<'a> {
117 /// Nothing yet.
118 #[default]
119 Absent,
120 /// The value of anything that takes typed text, a select included: what a
121 /// select holds is the `value` of one of [`Field::options`]'s
122 /// [`Choice`]s.
123 ///
124 /// It carried the options too until makeover-layout 0.8.0 moved them onto
125 /// the field, which collapsed a `Chosen { options, value }` variant into
126 /// this one. `makeover-immediate` arrived at the same single-variant shape
127 /// on its own, from the other direction.
128 Text(&'a str),
129 /// A checkbox, on or off.
130 On(bool),
131 /// Both ends of a [`FieldKind::Interval`], lower first.
132 ///
133 /// Two values rather than one string with a separator, for
134 /// [`makeover_layout::Field::upper_name`]'s reason one level down: an
135 /// interval submits under two names, so it comes back as two values, and a
136 /// delimiter this crate owned could appear inside either of them.
137 ///
138 /// Either end may be empty while the other stands. "Over 120 BPM" is a
139 /// lower end and no upper one, and it is an answer rather than a
140 /// half-filled form.
141 ///
142 /// Added 0.56.0 with makeover-layout 0.34.0.
143 Between {
144 /// What the lower box holds now.
145 lower: &'a str,
146 /// What the upper box holds now.
147 upper: &'a str,
148 },
149 }
150
151 impl<'a> Value<'a> {
152 /// The value as text, for the kinds that submit one.
153 const fn as_text(&self) -> &'a str {
154 match self {
155 Self::Text(text) | Self::Between { lower: text, .. } => text,
156 Self::Absent | Self::On(_) => "",
157 }
158 }
159 }
160
161 impl<'a> Value<'a> {
162 /// The upper end, for the one variant that has one.
163 const fn upper_text(&self) -> &'a str {
164 match self {
165 Self::Between { upper, .. } => upper,
166 Self::Absent | Self::Text(_) | Self::On(_) => "",
167 }
168 }
169 }
170
171 /// Everything about the field that the description does not carry.
172 #[derive(Debug, Clone, Copy, Default)]
173 pub struct Filling<'a> {
174 /// What the field holds now.
175 pub value: Value<'a>,
176 /// Markup appended inside the group, after the hint. Not escaped.
177 pub trailing: Option<Markup<'a>>,
178 /// Attributes written onto the control element itself. Not escaped.
179 ///
180 /// [`trailing`](Self::trailing)'s argument at attribute scale: a host knows
181 /// facts about the control that no description layer carries, and until
182 /// this existed the only way to attach one was to stop calling this emitter
183 /// and write a second one. quasi's suggestion source is the first caller —
184 /// a field that owns a list of candidates is a `role="combobox"` pointing
185 /// at the list it owns, and neither half is anything
186 /// [`makeover_layout::Field`] can say.
187 ///
188 /// Written verbatim, so a caller supplies `attr="value"` pairs with no
189 /// leading space and does its own escaping. It is [`Markup`]'s hole in the
190 /// same wall, named the same way so a caller has to state that the contents
191 /// are trusted.
192 ///
193 /// A [`FieldKind::Radio`] drops them, and that is deliberate rather than an
194 /// oversight: a radio group is a set of sibling inputs with no one control
195 /// element, so there is nowhere honest to put an attribute meant for the
196 /// control. The group carries the descriptions for the same reason.
197 pub control_attrs: Option<Markup<'a>>,
198 /// Scopes the `id` attributes to one instance of the form.
199 ///
200 /// The field's `name` is what the value submits under and is the same
201 /// wherever the form appears; its `id` has to be unique in the document,
202 /// and those two facts stop agreeing the moment a form appears twice.
203 /// goingson hits this directly: its new-task and edit-task modals are the
204 /// same field set, so it prefixes `form-modal-task-new` or `-edit` to keep
205 /// `label for` and `aria-describedby` pointing at the right control.
206 ///
207 /// Applies to `id`, `for` and the `-hint` / `-error` associations. Never to
208 /// `name`, which would change what the form submits.
209 pub id_prefix: Option<&'a str>,
210 }
211
212 impl<'a> Filling<'a> {
213 /// A filling that carries a value and nothing else.
214 #[must_use]
215 pub const fn of(value: Value<'a>) -> Self {
216 Self {
217 value,
218 trailing: None,
219 control_attrs: None,
220 id_prefix: None,
221 }
222 }
223
224 /// The document-unique id for a field of this name.
225 fn id_for(&self, name: &str) -> String {
226 let mut id = String::new();
227 if let Some(prefix) = self.id_prefix {
228 escape_into(prefix, &mut id);
229 id.push('-');
230 }
231 escape_into(name, &mut id);
232 id
233 }
234 }
235
236 /// Encode the five characters that let a value stop being a value, into a
237 /// buffer the caller already has.
238 ///
239 /// The form the emitters use. [`escape`] is this with a `String` allocated
240 /// around it, and the allocation is the whole difference: a described screen
241 /// escapes once per attribute and once per run of text, so a function that
242 /// returns a `String` allocates a few thousand times to produce one page, where
243 /// a template engine writes its escaped bytes straight into the output buffer.
244 /// Measured 2026-08-14 against a real pane, that gap was 85% of a 42x rendering
245 /// cost, and this is the half of the fix that lives in this crate.
246 ///
247 /// Sound in element text and in a double-quoted attribute alike, which is the
248 /// property `textContent`-based escaping cannot have. Both sinks are covered by
249 /// one function so that no call site has to choose, here or downstream.
250 ///
251 /// Copies in runs rather than per character. All five encoded characters are
252 /// ASCII, so a byte scan cannot land inside a multi-byte character and the
253 /// slice between two of them is always a valid `&str`. Text with nothing to
254 /// encode — which is most text — is one `push_str` of the whole thing.
255 pub fn escape_into(text: &str, out: &mut String) {
256 let mut start = 0;
257 for (index, byte) in text.bytes().enumerate() {
258 let encoded = match byte {
259 b'&' => "&amp;",
260 b'<' => "&lt;",
261 b'>' => "&gt;",
262 b'"' => "&quot;",
263 b'\'' => "&#39;",
264 _ => continue,
265 };
266 out.push_str(&text[start..index]);
267 out.push_str(encoded);
268 start = index + 1;
269 }
270 out.push_str(&text[start..]);
271 }
272
273 /// Encode the five characters that let a value stop being a value.
274 ///
275 /// [`escape_into`] with a buffer of its own, for the callers that want a value
276 /// rather than an append: a caller assembling an attribute out of several
277 /// pieces, and everything outside this crate that took this function before the
278 /// buffer-writing form existed. Emitting into a buffer you already hold is the
279 /// cheaper path and the one this crate's own emitters take.
280 #[must_use]
281 pub fn escape(text: &str) -> String {
282 let mut out = String::with_capacity(text.len());
283 escape_into(text, &mut out);
284 out
285 }
286
287 /// The `type` an input takes for a kind.
288 ///
289 /// [`FieldKind::Secret`] is `password`, which both apps already map by hand.
290 const fn input_type(kind: FieldKind) -> &'static str {
291 match kind {
292 FieldKind::Secret => "password",
293 FieldKind::Number => "number",
294 FieldKind::Checkbox => "checkbox",
295 FieldKind::File => "file",
296 FieldKind::Hidden => "hidden",
297 // Not decoration. Each of these changes the keyboard a touch device
298 // offers and turns on the platform's own validation, which is why the
299 // description names them apart from text rather than letting the app
300 // pass an HTML type through.
301 FieldKind::Email => "email",
302 FieldKind::Url => "url",
303 FieldKind::Tel => "tel",
304 // The same argument, and it buys more here than anywhere else in this
305 // list: a native picker as well as the keyboard and the validation.
306 // Both submit the format `makeover-layout` names, `DATE_FORMAT` and
307 // `DATETIME_FORMAT`, so honouring it costs this renderer nothing.
308 FieldKind::Date => "date",
309 FieldKind::DateTime => "datetime-local",
310 FieldKind::Radio => "radio",
311 // The clearest case in this list that a kind is not decoration: a
312 // number and a range submit the same value and are different controls,
313 // and the browser is the one drawing the difference.
314 FieldKind::Range => "range",
315 // Select and Textarea are not inputs at all; they never reach here.
316 // Radio is one, but it is emitted once per option by `radio_html` and
317 // so does not reach here either.
318 FieldKind::Text | FieldKind::Select | FieldKind::Textarea | FieldKind::Rich => "text",
319 // A kind added to the description since this renderer was built. Text
320 // accepts any value the others would, so it degrades rather than
321 // dropping the field.
322 _ => "text",
323 }
324 }
325
326 /// The attributes every visible control carries, error state included.
327 ///
328 /// `aria-invalid` is the whole reason the error state is readable at all: the
329 /// generated stylesheet keys the danger ring on `[aria-invalid="true"]` rather
330 /// than on a class, so a control rendered already-invalid without it is styled
331 /// as if nothing were wrong. goingson's runtime validation path sets the
332 /// attribute and its initial render does not, which is exactly the drift one
333 /// emitter removes.
334 /// `id` and `name` arrive separately because they are not the same fact. The
335 /// name is what submits and is fixed by the description; the id has to be
336 /// unique in the document and so carries [`Filling::id_prefix`] when a form
337 /// appears more than once.
338 /// The `accept` attribute, from the description's accept list.
339 ///
340 /// makeover-layout 0.31.0. The list is comma-joined because that is the
341 /// attribute's own format, and each entry writes itself: a family is its
342 /// wildcard media type, a media type is itself, a suffix is itself with its
343 /// leading dot. Nothing is normalised on the way through -- `.tar.gz` is two
344 /// dots and the browser is fine with it.
345 ///
346 /// An empty list emits no attribute at all, which is the browser's own "any
347 /// file" and is what the description means by listing nothing. Emitting
348 /// `accept=""` instead would be a filter that matches nothing on some browsers
349 /// and everything on others.
350 ///
351 /// It is a filter and not a guarantee, on the browser's side as much as here:
352 /// the picker keeps an "All Files" escape and the user may take it. Whoever
353 /// validated still validates.
354 fn push_accept(out: &mut String, field: &Field<'_>) {
355 if field.accept.is_empty() {
356 return;
357 }
358 out.push_str(" accept=\"");
359 for (index, one) in field.accept.iter().enumerate() {
360 if index > 0 {
361 out.push(',');
362 }
363 escape_into(one.as_str(), out);
364 }
365 out.push('"');
366 }
367
368 /// The extent and the granularity, as the browser spells them.
369 ///
370 /// Its own function because an interval writes them onto both of its ends: they
371 /// describe the axis rather than either end of it, which is what
372 /// [`FieldKind::Interval`] says and what the six audiofiles filter axes are.
373 fn push_bounds(out: &mut String, field: &Field<'_>) {
374 if let Some(min) = field.min {
375 out.push_str(" min=\"");
376 escape_into(min, out);
377 out.push('"');
378 }
379 if let Some(max) = field.max {
380 out.push_str(" max=\"");
381 escape_into(max, out);
382 out.push('"');
383 }
384 // The browser's own default is `step="1"`, which turns a 0-to-1 threshold
385 // into a two-position control. That is the granularity the description
386 // means when it says nothing, so this is emitted only when an app has said
387 // otherwise rather than defaulted here.
388 //
389 // A range takes its granularity from its curve as of makeover-layout
390 // 0.32.0, and every other kind keeps `Field::step`. See the crate header on
391 // what this renderer can and cannot do with a curve.
392 let step = if field.kind == FieldKind::Range {
393 field.curve.step()
394 } else {
395 field.step
396 };
397 if let Some(step) = step {
398 out.push_str(" step=\"");
399 escape_into(step, out);
400 out.push('"');
401 }
402 }
403
404 fn push_control_attributes(
405 out: &mut String,
406 field: &Field<'_>,
407 filling: &Filling<'_>,
408 id: &str,
409 name: &str,
410 ) {
411 let _ = write!(out, " id=\"{id}\" name=\"");
412 escape_into(name, out);
413 out.push('"');
414 if field.required {
415 out.push_str(" required");
416 }
417 // makeover-layout 0.11.0's constraints. The description carries the rule and
418 // this emits the browser's idiom for it, which is the model `required` has
419 // been using since before the crate wrote down that it carried none.
420 // Enforcement is still whoever validated's, and arrives back as `error`.
421 if let Some(limit) = field.max_length {
422 let _ = write!(out, " maxlength=\"{limit}\"");
423 }
424 push_bounds(out, field);
425 if field.invalid() {
426 out.push_str(" aria-invalid=\"true\"");
427 }
428
429 push_described_by(out, field, id);
430
431 // Last, so that a host attaching a fact of its own can see everything this
432 // emitter decided and cannot be overwritten by it. Duplicate attributes are
433 // the caller's to avoid: HTML takes the first of a repeated pair, so an
434 // attribute spelled here as well as there keeps this crate's answer.
435 if let Some(Markup(attrs)) = filling.control_attrs {
436 out.push(' ');
437 out.push_str(attrs);
438 }
439 }
440
441 /// The `aria-describedby` naming whatever of the hint and the error exist.
442 ///
443 /// Both associations, in the order they are useful: the standing help, then
444 /// what is currently wrong. goingson's runtime path points describedby at the
445 /// error alone and drops the hint association it never made in the first place;
446 /// naming both here means the hint survives an error appearing.
447 ///
448 /// Its own function because a radio group carries it on the group rather than
449 /// on a control, and one reading of "what describes this field" is the point.
450 fn push_described_by(out: &mut String, field: &Field<'_>, id: &str) {
451 let unit = unit_of(field).is_some();
452 if field.hint.is_none() && field.error.is_none() && field.note.is_none() && !unit {
453 return;
454 }
455 let mut written = false;
456 out.push_str(" aria-describedby=\"");
457 if field.hint.is_some() {
458 let _ = write!(out, "{id}-hint");
459 written = true;
460 }
461 // The unit before the error and after the hint, which is the order they are
462 // useful in: what the number is measured in is standing context like the
463 // hint, and what is wrong with it now comes last.
464 if unit {
465 if written {
466 out.push(' ');
467 }
468 let _ = write!(out, "{id}-unit");
469 written = true;
470 }
471 // The note after the unit and before the error, matching the order the
472 // three are drawn in and the order they are useful in: what the answer
473 // costs is context, and what is wrong with it now still comes last.
474 if field.note.is_some() {
475 if written {
476 out.push(' ');
477 }
478 let _ = write!(out, "{id}-note");
479 written = true;
480 }
481 if field.error.is_some() {
482 if written {
483 out.push(' ');
484 }
485 let _ = write!(out, "{id}-error");
486 }
487 out.push('"');
488 }
489
490 /// The unit to draw beside this field's value, if there is one to draw.
491 ///
492 /// Two conditions rather than one: the field has to carry a unit and its kind
493 /// has to be one that means anything by it. `FieldKind::measurable` is the
494 /// description answering the second, so this renderer keeps no list of its own
495 /// of which kinds are quantities.
496 fn unit_of<'a>(field: &Field<'a>) -> Option<&'a str> {
497 field.unit.filter(|_| field.kind.measurable())
498 }
499
500 /// Whether the field's control is a set of elements rather than one.
501 ///
502 /// A DOM concern rather than a description one, which is why it is decided here
503 /// and not in `makeover-layout`: `for` and `id` are an HTML association and
504 /// egui has no counterpart to get wrong. A `<label for>` aimed at a radio group
505 /// points at nothing, because no single element carries the group's id, so the
506 /// association has to invert — the label takes an id and the group names itself
507 /// with `aria-labelledby`.
508 const fn is_group_control(kind: FieldKind) -> bool {
509 matches!(kind, FieldKind::Radio | FieldKind::Interval)
510 }
511
512 /// An interval: two number boxes inside one labelled group.
513 ///
514 /// The markup MNW's discover sidebar writes by hand -- a `role="group"` with
515 /// `aria-labelledby` pointing at the question, holding `min_price` and
516 /// `max_price` -- which is HTML saying by hand exactly what
517 /// [`FieldKind::Interval`] now says in the description. So this emits what that
518 /// page already proved is right, rather than inventing a shape.
519 ///
520 /// The group carries the error state and the descriptions, for
521 /// [`push_radio`]'s reason: what is wrong is the answer, and marking one box
522 /// invalid would name the wrong half of a fault that belongs to both ends.
523 ///
524 /// # Both boxes take the same extent
525 ///
526 /// [`Field::min`], [`Field::max`] and [`Field::step`] describe the axis rather
527 /// than either end, so [`push_bounds`] writes them onto both. The crossing rule
528 /// is not emitted, because the description does not carry it and the browser
529 /// has no attribute for it: an upper end below the lower one is a refusal
530 /// whoever validated hands back as [`Field::error`], which lands on the group.
531 ///
532 /// # Which end is which, in words
533 ///
534 /// `aria-label`, because the description states direction structurally -- the
535 /// lower end's name is [`Field::name`] and the upper one's is
536 /// [`Field::upper_name`] -- and never in words. Words for the ends are the
537 /// host's, the same way a slider's readout is, and a page with visible Min and
538 /// Max captions supplies them through [`Filling::trailing`] rather than having
539 /// this crate own two strings of English.
540 fn push_interval(out: &mut String, field: &Field<'_>, filling: &Filling<'_>, opts: &Emit) {
541 let id = filling.id_for(field.name);
542
543 out.push_str("<div class=\"");
544 push_class(out, "form-interval", opts);
545 let _ = write!(out, "\" role=\"group\" aria-labelledby=\"{id}-label\"");
546 if field.invalid() {
547 out.push_str(" aria-invalid=\"true\"");
548 }
549 push_described_by(out, field, &id);
550 out.push('>');
551
552 // An interval with no upper name has one end that can be submitted, which
553 // is what the description said and is drawn honestly rather than repaired:
554 // `Field::interval` is what makes it unsayable, and inventing a name here
555 // would submit a parameter no handler is reading.
556 let ends: [(&str, &str, &str); 2] = [
557 ("lower", field.name, filling.value.as_text()),
558 (
559 "upper",
560 field.upper_name.unwrap_or(""),
561 filling.value.upper_text(),
562 ),
563 ];
564 for (end, name, value) in ends {
565 if name.is_empty() {
566 continue;
567 }
568 out.push_str("<input type=\"number\" class=\"");
569 push_class(out, "field", opts);
570 let _ = write!(out, "\" id=\"{id}-{end}\" name=\"");
571 escape_into(name, out);
572 let _ = write!(out, "\" aria-label=\"{end}\"");
573 if field.required {
574 out.push_str(" required");
575 }
576 push_bounds(out, field);
577 if let Some(text) = field.placeholder {
578 out.push_str(" placeholder=\"");
579 escape_into(text, out);
580 out.push('"');
581 }
582 out.push_str(" value=\"");
583 escape_into(value, out);
584 out.push_str("\">");
585 }
586
587 out.push_str("</div>");
588 }
589
590 /// A radio group: the options as sibling inputs sharing one `name`.
591 ///
592 /// The group carries the error state and the descriptions, and the inputs carry
593 /// what submits. That split is [`Field::invalid`]'s reasoning applied one level
594 /// down: marking a single input invalid would say the wrong thing, since what
595 /// is wrong is the answer to the question and not one of the alternatives.
596 ///
597 /// Ids are numbered rather than built from the option values, which can hold
598 /// anything a `&str` can — spaces and quotes included — and would otherwise
599 /// have to be slugged into something unique by a rule this crate would then own.
600 ///
601 /// `required` lands on every input, which is how HTML says a group is
602 /// compulsory: the constraint is satisfied when any one of them is checked.
603 fn push_radio(out: &mut String, field: &Field<'_>, filling: &Filling<'_>, opts: &Emit) {
604 let id = filling.id_for(field.name);
605 let value = filling.value.as_text();
606 let name = escape(field.name);
607
608 out.push_str("<div class=\"");
609 push_class(out, "form-radio-group", opts);
610 let _ = write!(out, "\" role=\"radiogroup\" aria-labelledby=\"{id}-label\"");
611 if field.invalid() {
612 out.push_str(" aria-invalid=\"true\"");
613 }
614 push_described_by(out, field, &id);
615 out.push('>');
616
617 // A group described with no options emits an empty group, for the reason
618 // `Field::options` gives: an app whose option list has not loaded has
619 // exactly that, and an empty group says so on screen rather than in a log.
620 for (index, opt) in field.options.iter().enumerate() {
621 out.push_str("<label class=\"");
622 push_class(out, "form-radio-label", opts);
623 let _ = write!(
624 out,
625 "\"><input type=\"radio\" id=\"{id}-{index}\" name=\"{name}\" value=\""
626 );
627 escape_into(opt.value, out);
628 out.push('"');
629 if opt.value == value {
630 out.push_str(" checked");
631 }
632 if field.required {
633 out.push_str(" required");
634 }
635 // A radio group has room a `<select>` does not, so the reason gets its
636 // own element beside the label rather than being run into it. The class
637 // is what a stylesheet mutes; the text is there either way, which is
638 // the half that matters — the finding was a greyed control with its
639 // explanation behind a hover.
640 if let Some(reason) = opt.unavailable {
641 out.push_str(" disabled");
642 out.push_str("><span>");
643 escape_into(opt.label, out);
644 out.push_str("</span><span class=\"");
645 push_class(out, "form-option-reason", opts);
646 out.push_str("\">");
647 escape_into(reason, out);
648 out.push_str("</span></label>");
649 continue;
650 }
651 out.push_str("><span>");
652 escape_into(opt.label, out);
653 out.push_str("</span></label>");
654 }
655
656 out.push_str("</div>");
657 }
658
659 /// The options of a select: the unanswered instruction, an unmatched current
660 /// value carried as its own, then the options themselves.
661 ///
662 /// A select handed a value no option carries renders with nothing selected, the
663 /// browser falls back to the first option, and the next save writes a value
664 /// nobody chose. goingson hit exactly that with a backup-retention default of
665 /// 10 against a 1/3/7/14/0 list, and grew this stray-option fix locally; it is
666 /// here so the second app gets it without hitting the bug first.
667 fn push_options(out: &mut String, field: &Field<'_>, options: &[Choice<'_>], value: &str) {
668 // The unanswered state, which HTML has no attribute for: `placeholder` is
669 // not a `<select>` attribute, and the idiom is an empty option that cannot
670 // be chosen back. `disabled` is what stops it being re-selected once the
671 // user has answered, and `selected` is what puts it in the closed control
672 // while the value is empty; together they read as an instruction rather
673 // than as an option.
674 //
675 // `required` keeps working through it rather than around it: the option's
676 // value is empty, so a required select with this showing is invalid, which
677 // is the true report on a question nobody has answered.
678 //
679 // Emitted only while the value is empty, so it does not sit in the open
680 // list once the field is answered. A non-empty value no option carries is a
681 // wrong answer rather than an absent one and takes the stray-option path
682 // below.
683 if value.is_empty()
684 && let Some(text) = field.placeholder
685 {
686 out.push_str("<option value=\"\" disabled selected>");
687 escape_into(text, out);
688 out.push_str("</option>");
689 }
690 if !value.is_empty() && !options.iter().any(|opt| opt.value == value) {
691 // The one place an escaped value is worth keeping: it is written twice,
692 // as the option's value and as its text.
693 let escaped = escape(value);
694 let _ = write!(
695 out,
696 "<option value=\"{escaped}\" selected data-unmatched=\"true\">{escaped}</option>"
697 );
698 }
699 for opt in options {
700 out.push_str("<option value=\"");
701 escape_into(opt.value, out);
702 out.push('"');
703 if opt.value == value {
704 out.push_str(" selected");
705 }
706 // `disabled` is what the browser reads, and it says nothing about why.
707 // The reason goes in the option's own text, because a `<select>` gives
708 // its options no room for anything else: no title attribute the
709 // keyboard reaches, no second line, no element inside. So the row reads
710 // "Multi-sample: Drop a second sample onto the keyboard." and is the
711 // one place the precondition can be both attached to its option and
712 // read without a pointer.
713 if let Some(reason) = opt.unavailable {
714 out.push_str(" disabled");
715 out.push('>');
716 escape_into(opt.label, out);
717 out.push_str(": ");
718 escape_into(reason, out);
719 out.push_str("</option>");
720 continue;
721 }
722 out.push('>');
723 escape_into(opt.label, out);
724 out.push_str("</option>");
725 }
726 }
727
728 /// The control itself, without its label, hint or error.
729 fn push_control(out: &mut String, field: &Field<'_>, filling: &Filling<'_>, opts: &Emit) {
730 // Emitted before anything else is computed: a radio group carries its
731 // descriptions on the group rather than on a control, so none of the
732 // attributes below belong to it.
733 if matches!(field.kind, FieldKind::Radio) {
734 push_radio(out, field, filling, opts);
735 return;
736 }
737 // The same split one kind along: an interval is two inputs and one
738 // question, so the group carries the error and the descriptions and the
739 // boxes carry what submits.
740 if matches!(field.kind, FieldKind::Interval) {
741 push_interval(out, field, filling, opts);
742 return;
743 }
744
745 let id = filling.id_for(field.name);
746 let placeholder = |out: &mut String| {
747 if let Some(text) = field.placeholder {
748 out.push_str(" placeholder=\"");
749 escape_into(text, out);
750 out.push('"');
751 }
752 };
753
754 match field.kind {
755 // Both multi-line kinds are a `<textarea>`, and the markdown one says so
756 // in an attribute rather than in a class: what the value *is* is not a
757 // styling hook, and a progressive enhancement looking for editors to
758 // upgrade needs a selector that survives `Emit`'s class prefixing.
759 // Without the mark, a described editor is a plain box and the four
760 // hand-written MNW editors have nothing to convert onto.
761 //
762 // `data-format` and not `data-value`: this names the shape of the
763 // value, and `facet` already spends `data-facet-value` on carrying an
764 // actual one. Two attributes a letter apart meaning opposite things is
765 // how a renderer's own vocabulary starts drifting.
766 kind if kind.multiline() => {
767 let rich = matches!(kind, FieldKind::Rich);
768 if rich {
769 push_editor_open(out, opts);
770 }
771 out.push_str("<textarea class=\"");
772 push_class(out, "field", opts);
773 out.push('"');
774 if rich {
775 out.push_str(" data-format=\"markdown\"");
776 }
777 push_control_attributes(out, field, filling, &id, field.name);
778 placeholder(out);
779 out.push('>');
780 escape_into(filling.value.as_text(), out);
781 out.push_str("</textarea>");
782 if rich {
783 push_editor_close(out, opts);
784 }
785 }
786 FieldKind::Select => {
787 out.push_str("<select class=\"");
788 push_class(out, "field", opts);
789 out.push('"');
790 push_control_attributes(out, field, filling, &id, field.name);
791 out.push('>');
792 // A select described with no options emits an empty select, which
793 // says so on screen rather than in a log. That is the description's
794 // own position on `Field::options`, not a fallback invented here.
795 push_options(out, field, field.options, filling.value.as_text());
796 out.push_str("</select>");
797 }
798 FieldKind::Checkbox => {
799 out.push_str("<label class=\"");
800 push_class(out, "form-checkbox-label", opts);
801 out.push_str("\"><input type=\"checkbox\"");
802 push_control_attributes(out, field, filling, &id, field.name);
803 if matches!(filling.value, Value::On(true)) {
804 out.push_str(" checked");
805 }
806 out.push_str("><span>");
807 escape_into(field.label, out);
808 out.push_str("</span></label>");
809 }
810 // A secret never carries its value into the markup. `FieldKind::secret`
811 // is documented as a value that must not be round-tripped through
812 // anything that might persist it, and the DOM is such a thing: it is
813 // read by every extension on the page and is the first thing a crash
814 // reporter serialises. Neither app pre-fills one today, so this costs
815 // nothing and closes the door before something does.
816 FieldKind::Secret => {
817 out.push_str("<input type=\"password\" class=\"");
818 push_class(out, "field", opts);
819 out.push('"');
820 push_control_attributes(out, field, filling, &id, field.name);
821 placeholder(out);
822 out.push('>');
823 }
824 // A file input carries no value, and this is the browser's rule rather
825 // than a preference: setting one from markup is refused, because a page
826 // that could preselect a path could read a file the user never offered.
827 // Nothing upstream needs to know, which is why the exception is here.
828 FieldKind::File => {
829 out.push_str("<input type=\"file\" class=\"");
830 push_class(out, "field", opts);
831 out.push('"');
832 push_control_attributes(out, field, filling, &id, field.name);
833 push_accept(out, field);
834 if field.multiple {
835 out.push_str(" multiple");
836 }
837 out.push('>');
838 }
839 kind => {
840 let _ = write!(out, "<input type=\"{}\" class=\"", input_type(kind));
841 push_class(out, "field", opts);
842 out.push('"');
843 push_control_attributes(out, field, filling, &id, field.name);
844 placeholder(out);
845 out.push_str(" value=\"");
846 escape_into(filling.value.as_text(), out);
847 out.push_str("\">");
848 }
849 }
850 }
851
852 /// The chrome a markdown field gets and a plain textarea does not: the two
853 /// modes, and the pane a preview lands in.
854 ///
855 /// # Why this is the one field with markup around it
856 ///
857 /// [`FieldKind::Rich`]'s own doc says the mark buys a renderer permission to
858 /// offer a preview or a syntax pass, and that a renderer with neither draws a
859 /// textarea. A renderer taking the permission and emitting the same box as
860 /// [`FieldKind::Textarea`] leaves an app converting onto the member with less
861 /// than it had written by hand: MNW's `partial-item-text-editor.js` has a
862 /// Write/Preview pair and a pane behind it, and describing the field without
863 /// this would delete both. So the pair is here, on `facet`'s argument one
864 /// field down -- the markup it replaces is not markup an app is keeping.
865 ///
866 /// # Nothing here renders markdown, and that is where the sanitising stays
867 ///
868 /// The pane arrives empty and this crate never turns a value into markup.
869 /// Converting markdown is the host's, which is where the sanitiser already is:
870 /// MNW renders through `docengine` over ammonia and holds an allowlist beside
871 /// it. A converter here would move that guarantee into a crate with no view of
872 /// the host's content-security posture, and `Rich`'s doc is explicit that a
873 /// host with its own sanitiser still owns it. What this emits is a hook, and
874 /// whatever fills it fills it with markup it has already made safe.
875 ///
876 /// # The direction the enhancement runs
877 ///
878 /// [`crate::stylesheet`]'s rule for a showing region, and for its reason: a
879 /// control rendered into a document with no script is a control that looks live
880 /// and answers nothing. Nothing is hidden here and no control is shown until
881 /// whatever binds the editor sets `data-ready` on the wrapper, so a reader with
882 /// no script gets the textarea alone -- what 0.50.0 emitted -- and a reader with
883 /// script gets the modes. A bound editor says which mode it is in with
884 /// `data-mode`, and [`editor_rules`] reads that.
885 fn push_editor_open(out: &mut String, opts: &Emit) {
886 // The mark sits on the wrapper as well as on the control, saying one thing
887 // about two: this control's value is markdown, and this editor edits
888 // markdown. The rules gate on the wrapper and they are attribute rules
889 // rather than class rules for `data-format`'s own reason -- the gate has to
890 // survive `Emit`'s class prefixing, because the enhancement selects on it
891 // too.
892 out.push_str("<div data-format=\"markdown\"><div class=\"");
893 push_class(out, "form-editor-modes", opts);
894 out.push_str("\">");
895 push_mode(out, "write", "Write", true, opts);
896 push_mode(out, "preview", "Preview", false, opts);
897 out.push_str("</div>");
898 }
899
900 /// One of the two modes, as a segment of the pair.
901 ///
902 /// [`crate::option_class`] for [`Selector::Segmented`] rather than a name of
903 /// its own: a Write/Preview pair is a segmented control, and spelling it as one
904 /// gets it the depth, the focus ring and the chosen state every described
905 /// selector gets, from rules that already exist. The words are written here for
906 /// the reason `facet`'s exclude button writes its own: a description carrying
907 /// them would be choosing them for the terminal as well.
908 fn push_mode(out: &mut String, mode: &str, label: &str, chosen: bool, opts: &Emit) {
909 out.push_str("<button type=\"button\" class=\"");
910 push_class(out, crate::option_class(Selector::Segmented), opts);
911 if chosen {
912 // The sheet keys the held-in segment on the class and a screen reader
913 // reads the attribute. Both, because they are two readings of one fact,
914 // which is the arrangement a facet value already has.
915 out.push_str(" chosen");
916 }
917 let _ = write!(
918 out,
919 "\" data-editor-mode=\"{mode}\" aria-pressed=\"{chosen}\">{label}</button>"
920 );
921 }
922
923 /// The preview pane, and the wrapper closing over both halves.
924 fn push_editor_close(out: &mut String, opts: &Emit) {
925 out.push_str("<div class=\"");
926 push_class(out, "form-editor-preview", opts);
927 // `data-editor-preview` and not an id: a form appears twice in a document
928 // often enough that `Filling::id_prefix` exists for it, and a binder holding
929 // the control can reach this without either of them being unique.
930 out.push_str("\" data-editor-preview></div></div>");
931 }
932
933 /// The rules the markdown editor's chrome needs.
934 ///
935 /// The one place this module writes CSS. The class names [`field_html`] emits
936 /// are goingson's and are deliberately unruled -- `.form-group`, `.form-label`,
937 /// `.form-hint` and `.form-error` are the app's own, and phase A emits only what
938 /// it can generate from the description -- but the two names here have no app
939 /// counterpart to keep, because the chrome did not exist before the member did.
940 ///
941 /// Every rule is gated on `[data-format="markdown"]`, which is what keeps them
942 /// off a plain textarea, and every rule that hides content is gated on
943 /// `data-ready` as well, which is what keeps them out of a document with no
944 /// script.
945 pub(crate) fn editor_rules(opts: &Emit) -> String {
946 let mut css = String::new();
947 let modes = class("form-editor-modes", opts);
948 let preview = class("form-editor-preview", opts);
949 let field = class("field", opts);
950
951 // Hidden until something binds the editor, which is the whole argument in
952 // `push_editor_open`.
953 let _ = writeln!(
954 css,
955 "[data-format=\"markdown\"] > .{modes} {{\n display: none;\n}}"
956 );
957 // Block, and nothing about how the two segments sit in it. A button is
958 // inline already, so they make a row without this crate saying so, and
959 // saying so is where a gap would follow -- a magnitude, and
960 // `makeover-geometry`'s.
961 let _ = writeln!(
962 css,
963 "[data-format=\"markdown\"][data-ready] > .{modes} {{\n display: block;\n}}"
964 );
965
966 // The pane is empty until the host fills it, so it is out of flow in every
967 // state but the one where a bound editor is showing it. An empty box under
968 // the control is chrome claiming a preview nobody rendered.
969 let _ = writeln!(
970 css,
971 "[data-format=\"markdown\"] > .{preview} {{\n display: none;\n}}"
972 );
973 let _ = writeln!(
974 css,
975 "[data-format=\"markdown\"][data-ready][data-mode=\"preview\"] > .{preview} \
976 {{\n display: block;\n}}"
977 );
978 // One at a time. The source and the preview are the same content read two
979 // ways, and a field showing both answers its own question twice.
980 let _ = writeln!(
981 css,
982 "[data-format=\"markdown\"][data-ready][data-mode=\"preview\"] > .{field} \
983 {{\n display: none;\n}}"
984 );
985
986 // The pane stands where the control stood, so it reads as the surface the
987 // control was: `.field` is a well, and this is the well it stands in for.
988 // Nothing about size -- how tall a preview is is the app's, the way the
989 // height of a track is.
990 let _ = write!(
991 css,
992 "[data-format=\"markdown\"] > .{preview} {{\n{}}}\n",
993 crate::depth_declarations(Depth::Well)
994 );
995
996 css
997 }
998
999 /// The rule a field's unit needs.
1000 ///
1001 /// [`suggestion_rules`]' precedent and its argument: `.form-group`,
1002 /// `.form-label`, `.form-hint` and `.form-error` are the apps' own names and
1003 /// stay unruled here, and this one has no app counterpart to keep because
1004 /// nothing emitted it before `Field::unit` existed.
1005 ///
1006 /// One declaration, and it is the whole look. A unit is a fact about the number
1007 /// beside it rather than a second thing to read, so it takes the muted content
1008 /// intent -- the same reading `.figure-caption` and `.track-tick` take, and for
1009 /// the same reason.
1010 ///
1011 /// Nothing about placement or spacing. Where the span sits relative to the
1012 /// control is the app's layout, exactly as `.form-hint`'s is, and a margin
1013 /// asserted here would be this crate deciding a magnitude that belongs to
1014 /// `makeover-geometry`.
1015 /// The rules a field's note needs.
1016 ///
1017 /// [`unit_rules`]' precedent and its argument: `.form-hint` and `.form-error`
1018 /// are the apps' own names and stay unruled here, and this one has no app
1019 /// counterpart to keep because nothing emitted it before [`Field::note`]
1020 /// existed.
1021 ///
1022 /// Colour only, and the tones are the four a badge carries. The bare class is
1023 /// `content` rather than `content-muted`: a note is a consequence the user is
1024 /// meant to read before answering, so muting it by default would be this crate
1025 /// deciding it does not matter.
1026 pub(crate) fn note_rules(opts: &Emit) -> String {
1027 let note = class("form-note", opts);
1028 let mut css = String::new();
1029 let _ = writeln!(css, ".{note} {{\n color: var(--content);\n}}");
1030 for tone in [Tone::Info, Tone::Success, Tone::Warning, Tone::Danger] {
1031 let _ = writeln!(
1032 css,
1033 ".{note}[data-tone=\"{0}\"] {{\n color: var(--{0});\n}}",
1034 tone.token()
1035 );
1036 }
1037 css
1038 }
1039
1040 pub(crate) fn unit_rules(opts: &Emit) -> String {
1041 let unit = class("form-unit", opts);
1042 let mut css = String::new();
1043 let _ = writeln!(css, ".{unit} {{\n color: var(--content-muted);\n}}");
1044 css
1045 }
1046
1047 /// The rules a field's suggestion list needs.
1048 ///
1049 /// [`editor_rules`]' precedent and its argument: the class names this module's
1050 /// markup emits are the apps' own and stay unruled, and these three have no app
1051 /// counterpart to keep because the list did not exist before the member did.
1052 /// The markup is `quasi-webview`'s rather than this crate's — a suggestion
1053 /// source is a route, which no description layer carries — and the look is
1054 /// still this crate's, because a renderer inventing how a list of candidates
1055 /// reads is the drift the vocabulary check exists to catch.
1056 ///
1057 /// # In flow, and not floating
1058 ///
1059 /// An absolutely positioned list needs a positioned ancestor, and the only
1060 /// candidate is `.form-group`, which is the app's class and deliberately
1061 /// unruled here. So the list stands under the control and moves what is below
1062 /// it. An app that wants it over the form positions the group itself, which is
1063 /// one declaration and is the app's call about its own layout.
1064 ///
1065 /// `:empty` is what takes it away, so a route that answers with no candidates
1066 /// leaves no box behind. It is a content question rather than a whitespace one
1067 /// only because the emitter writes no whitespace inside the container, which is
1068 /// stated in `quasi-webview`'s own test.
1069 ///
1070 /// # Nothing about size
1071 ///
1072 /// No height, no scroll ceiling, no padding. How tall a list of candidates gets
1073 /// to be before it scrolls is a magnitude, and magnitudes are
1074 /// `makeover-geometry`'s, exactly as the preview pane's height is.
1075 pub(crate) fn suggestion_rules(opts: &Emit) -> String {
1076 let list = class("form-suggestions", opts);
1077 let entry = class("form-suggestion", opts);
1078 let detail = class("form-suggestion-detail", opts);
1079 let mut css = String::new();
1080
1081 let _ = writeln!(css, ".{list}:empty {{\n display: none;\n}}");
1082 // Over what it covers, which is what a list of candidates is even in flow:
1083 // it is answering the box above it and goes away when the answer is taken.
1084 css.push_str(&crate::depth_rule(&list, Depth::Overlay));
1085 // An entry answers a click, so it gets every state one implies.
1086 css.push_str(&crate::interactive_rules(&entry, Depth::Flat, opts));
1087 // The keyboard's highlight and the pointer's are the same surface. They are
1088 // the same fact told two ways, and a list where arrowing and hovering look
1089 // different is a list that has two current entries.
1090 //
1091 // Keyed on `aria-selected` rather than on a class, for the reason
1092 // `aria-invalid` carries the error state: it is what a screen reader hears,
1093 // so a look keyed on it cannot drift from what is announced. A `.current`
1094 // class would also be a name apps already spell for their own reasons --
1095 // the MNW server has one -- and unlayered app CSS beats this layer in
1096 // silence.
1097 let _ = writeln!(
1098 css,
1099 ".{entry}[aria-selected=\"true\"] {{\n background: var(--hover-surface);\n}}"
1100 );
1101 // The second line, muted rather than disabled. `1fcf2e9b` replaced the
1102 // unavailable reason this rule used to draw: a candidate carries no
1103 // `unavailable`, and what sits beside the label now is what tells one row
1104 // from another that reads the same. Disabled would say the row cannot be
1105 // picked, which is the opposite of what the detail is for.
1106 let _ = writeln!(css, ".{detail} {{\n color: var(--content-muted);\n}}");
1107
1108 css
1109 }
1110
1111 /// One field, as the group the app drops into its form.
1112 ///
1113 /// The shape is goingson's, down to the class names, so adoption there deletes
1114 /// `renderFormField` rather than restyling anything. That is also why the class
1115 /// names are not emitted by [`crate::stylesheet`]: `.form-group`, `.form-label`,
1116 /// `.form-hint` and `.form-error` are the apps' own, and phase A deliberately
1117 /// emits only what it can generate from the description. Whether they should
1118 /// move into the description is the next question this raises, not one it
1119 /// answers.
1120 ///
1121 /// A [`FieldKind::Hidden`] field is the input alone: no group, no label, and
1122 /// nothing drawn, which is what [`FieldKind::visible`] means.
1123 ///
1124 /// The error marks the group as well as the control. That is
1125 /// [`Field::invalid`]'s own reasoning: a renderer with no descendant selectors
1126 /// cannot find the group from the message, so the group has to be told.
1127 ///
1128 /// ```
1129 /// use makeover_layout::{Field, FieldKind};
1130 /// use makeover_webview::{Emit, form::{Filling, Value, field_html}};
1131 ///
1132 /// let field = Field::new(FieldKind::Text, "title", "Title");
1133 /// let html = field_html(&field, &Filling::of(Value::Text("Ship it")), &Emit::default());
1134 ///
1135 /// assert!(html.contains(r#"<label class="form-label" for="title">Title</label>"#));
1136 /// assert!(html.contains(r#"value="Ship it""#));
1137 /// ```
1138 #[must_use]
1139 pub fn field_html(field: &Field<'_>, filling: &Filling<'_>, opts: &Emit) -> String {
1140 let mut html = String::new();
1141 field_html_into(field, filling, opts, &mut html);
1142 html
1143 }
1144
1145 /// One field, written into a buffer the caller already has.
1146 ///
1147 /// [`field_html`]'s streaming form, byte-identical to it. A form is a run of
1148 /// these, so a host building one should hold a single buffer and append each
1149 /// field into it rather than take a `String` per field and concatenate.
1150 pub fn field_html_into(field: &Field<'_>, filling: &Filling<'_>, opts: &Emit, out: &mut String) {
1151 let id = filling.id_for(field.name);
1152
1153 if !field.kind.visible() {
1154 // Name only, no id: a hidden field is never pointed at by a label or a
1155 // description, so the one attribute it needs is the one that submits.
1156 out.push_str("<input type=\"hidden\" name=\"");
1157 escape_into(field.name, out);
1158 out.push_str("\" value=\"");
1159 escape_into(filling.value.as_text(), out);
1160 out.push_str("\">");
1161 return;
1162 }
1163
1164 out.push_str("<div class=\"");
1165 push_class(out, "form-group", opts);
1166 if field.invalid() {
1167 out.push_str(" has-error");
1168 }
1169 if field.extended {
1170 // The disclosure that hides these is a property of the form, not of the
1171 // field, so the field is marked and the app opens or closes the group.
1172 out.push_str("\" data-extended=\"true");
1173 }
1174 out.push_str("\">");
1175
1176 // A checkbox labels itself, on the right of the box. Both apps special-case
1177 // this inline today, which is the tell that it belongs in the description;
1178 // `FieldKind::labels_itself` is where it went.
1179 if !field.kind.labels_itself() {
1180 out.push_str("<label class=\"");
1181 push_class(out, "form-label", opts);
1182 // A group control is named *by* its label rather than pointing at it,
1183 // so the two carry opposite halves of the association. See
1184 // `is_group_control`.
1185 if is_group_control(field.kind) {
1186 let _ = write!(out, "\" id=\"{id}-label\">");
1187 } else {
1188 let _ = write!(out, "\" for=\"{id}\">");
1189 }
1190 escape_into(field.label, out);
1191 out.push_str("</label>");
1192 }
1193
1194 push_control(out, field, filling, opts);
1195
1196 // Adjacent text, because HTML has no unit attribute and inventing one would
1197 // be markup nothing reads. Pointed at by `aria-describedby` so it is not
1198 // decoration a screen reader skips: the number and what it is measured in
1199 // are one fact, and reading the first without the second is reading it
1200 // wrong.
1201 if let Some(unit) = unit_of(field) {
1202 out.push_str("<span class=\"");
1203 push_class(out, "form-unit", opts);
1204 let _ = write!(out, "\" id=\"{id}-unit\">");
1205 escape_into(unit, out);
1206 out.push_str("</span>");
1207 }
1208
1209 if let Some(hint) = field.hint {
1210 out.push_str("<div class=\"");
1211 push_class(out, "form-hint", opts);
1212 let _ = write!(out, "\" id=\"{id}-hint\">");
1213 escape_into(hint, out);
1214 out.push_str("</div>");
1215 }
1216 // A consequence of the answer, between the standing help and the failure.
1217 // The tone rides on `data-tone` -- the same attribute every other toned
1218 // thing in this crate takes -- and it also picks the live region: Warning
1219 // and Danger are assertive, which is quasi-webview's own reading at
1220 // `node.rs:1403` and is honoured here rather than restated differently.
1221 if let Some((tone, note)) = field.note {
1222 out.push_str("<div class=\"");
1223 push_class(out, "form-note", opts);
1224 let assertive = matches!(tone, Tone::Warning | Tone::Danger);
1225 let _ = write!(
1226 out,
1227 "\" id=\"{id}-note\" role=\"{}\"",
1228 if assertive { "alert" } else { "status" }
1229 );
1230 // Neutral is the bare class rather than a variant, matching every
1231 // other toned component here: it is the absence of a status.
1232 if tone != Tone::Neutral {
1233 let _ = write!(out, " data-tone=\"{}\"", tone.token());
1234 }
1235 out.push('>');
1236 escape_into(note, out);
1237 out.push_str("</div>");
1238 }
1239 if let Some(Markup(markup)) = filling.trailing {
1240 out.push_str(markup);
1241 }
1242 if let Some(error) = field.error {
1243 out.push_str("<div class=\"");
1244 push_class(out, "form-error", opts);
1245 let _ = write!(out, " visible\" id=\"{id}-error\" role=\"alert\">");
1246 escape_into(error, out);
1247 out.push_str("</div>");
1248 }
1249
1250 out.push_str("</div>");
1251 }
1252
1253 #[cfg(test)]
1254 mod tests {
1255 use super::*;
1256 use makeover_layout::{Accepted, Curve, Family};
1257
1258 fn field(kind: FieldKind) -> Field<'static> {
1259 Field::new(kind, "title", "Title")
1260 }
1261
1262 #[test]
1263 fn a_value_cannot_break_out_of_the_attribute_it_sits_in() {
1264 // The payload from goingson's own CHRONIC-XSS regression test.
1265 let filling = Filling::of(Value::Text("x\" onfocus=alert(1) autofocus=\""));
1266 let html = field_html(&field(FieldKind::Text), &filling, &Emit::default());
1267 // The payload survives as text, which is the point: it is inert
1268 // because the quote that would have closed the attribute is encoded,
1269 // not because the words were filtered.
1270 assert!(!html.contains("\" onfocus"), "{html}");
1271 assert!(
1272 html.contains("value=\"x&quot; onfocus=alert(1) autofocus=&quot;\""),
1273 "{html}"
1274 );
1275 }
1276
1277 /// The seam quasi's suggestion source needs: a host's own attributes land
1278 /// on the control, unescaped, and after everything this crate decided.
1279 #[test]
1280 fn a_host_can_write_its_own_attributes_onto_the_control() {
1281 let mut filling = Filling::of(Value::Text("ru"));
1282 filling.control_attrs = Some(Markup(
1283 r#"role="combobox" aria-expanded="false" aria-controls="title-suggestions""#,
1284 ));
1285 let html = field_html(&field(FieldKind::Text), &filling, &Emit::default());
1286 assert!(html.contains(r#"role="combobox""#), "{html}");
1287 assert!(
1288 html.contains(r#"aria-controls="title-suggestions""#),
1289 "{html}"
1290 );
1291 // After the id, which is what "last" buys: a host can read what this
1292 // emitter wrote and cannot be overwritten by it.
1293 let id = html.find(r#"id="title""#).expect("id");
1294 let role = html.find(r#"role="combobox""#).expect("role");
1295 assert!(id < role, "{html}");
1296 }
1297
1298 /// A radio group has no one control element, so there is nowhere honest to
1299 /// put an attribute meant for the control. Documented on the member.
1300 #[test]
1301 fn a_radio_group_drops_control_attributes() {
1302 let mut f = field(FieldKind::Radio);
1303 let options = [Choice::new("a", "A")];
1304 f.options = &options;
1305 let filling = Filling {
1306 control_attrs: Some(Markup(r#"data-host="1""#)),
1307 ..Filling::default()
1308 };
1309 let html = field_html(&f, &filling, &Emit::default());
1310 assert!(!html.contains("data-host"), "{html}");
1311 }
1312
1313 #[test]
1314 fn a_label_cannot_open_a_tag() {
1315 let mut f = field(FieldKind::Text);
1316 f.label = "<script>alert(1)</script>";
1317 let html = field_html(&f, &Filling::default(), &Emit::default());
1318 assert!(!html.contains("<script>"), "{html}");
1319 assert!(html.contains("&lt;script&gt;"), "{html}");
1320 }
1321
1322 #[test]
1323 fn every_escaped_sink_is_covered_by_the_one_escaper() {
1324 assert_eq!(escape("&<>\"'"), "&amp;&lt;&gt;&quot;&#39;");
1325 // The character `textContent` serialization leaves alone, which is why
1326 // the app needs two escapers and this needs one.
1327 assert!(escape("\"").contains("&quot;"));
1328 }
1329
1330 /// The streaming escaper is the one the emitters call and [`escape`] is a
1331 /// buffer around it, so the two cannot be allowed to drift. It copies in
1332 /// runs between the encoded characters, which is where a multi-byte
1333 /// character would break it if the scan were not restricted to ASCII.
1334 #[test]
1335 fn the_streaming_escaper_appends_what_the_returning_one_returns() {
1336 for text in [
1337 "",
1338 "plain",
1339 "&<>\"'",
1340 "&&&",
1341 "a & b",
1342 "trailing&",
1343 "&leading",
1344 "é世 & <b>naïve</b> \u{1f600}",
1345 ] {
1346 let mut out = String::from("kept: ");
1347 escape_into(text, &mut out);
1348 assert_eq!(out, format!("kept: {}", escape(text)), "{text:?}");
1349 }
1350 }
1351
1352 /// Same obligation one layer up: a form is a run of fields appended into one
1353 /// buffer, and the two ways to get one have to agree byte for byte.
1354 #[test]
1355 fn a_streamed_field_is_the_field_the_other_form_returns() {
1356 let kinds = [
1357 FieldKind::Text,
1358 FieldKind::Secret,
1359 FieldKind::Number,
1360 FieldKind::Checkbox,
1361 FieldKind::Radio,
1362 FieldKind::Select,
1363 FieldKind::Textarea,
1364 FieldKind::File,
1365 FieldKind::Hidden,
1366 ];
1367 let choices = [Choice::plain("one"), Choice::plain("two")];
1368 let opts = Emit {
1369 class_prefix: "mk-",
1370 ..Emit::default()
1371 };
1372 for kind in kinds {
1373 let described = Field {
1374 hint: Some("a hint"),
1375 error: Some("wrong <here>"),
1376 placeholder: Some("x\" y"),
1377 options: &choices,
1378 required: true,
1379 max_length: Some(40),
1380 min: Some("1"),
1381 max: Some("9"),
1382 extended: true,
1383 ..Field::new(kind, "the & name", "The <label>")
1384 };
1385 let filling = Filling {
1386 value: Value::Text("one"),
1387 trailing: Some(Markup("<i>t</i>")),
1388 control_attrs: Some(Markup(r#"data-host="1""#)),
1389 id_prefix: Some("modal"),
1390 };
1391 let mut streamed = String::new();
1392 field_html_into(&described, &filling, &opts, &mut streamed);
1393 assert_eq!(
1394 streamed,
1395 field_html(&described, &filling, &opts),
1396 "{kind:?}"
1397 );
1398
1399 // And the bare field, where every optional half is absent.
1400 let plain = Field::new(kind, "name", "Label");
1401 let mut streamed = String::new();
1402 field_html_into(&plain, &Filling::default(), &opts, &mut streamed);
1403 assert_eq!(
1404 streamed,
1405 field_html(&plain, &Filling::default(), &opts),
1406 "{kind:?}"
1407 );
1408 }
1409 }
1410
1411 #[test]
1412 fn markup_is_the_only_way_past_the_escaping() {
1413 let filling = Filling {
1414 trailing: Some(Markup("<div class=\"recurrence-config\"></div>")),
1415 ..Filling::default()
1416 };
1417 let html = field_html(&field(FieldKind::Text), &filling, &Emit::default());
1418 assert!(
1419 html.contains("<div class=\"recurrence-config\"></div>"),
1420 "{html}"
1421 );
1422 }
1423
1424 #[test]
1425 fn an_invalid_field_carries_the_attribute_its_own_stylesheet_keys_on() {
1426 let mut f = field(FieldKind::Text);
1427 f.error = Some("Required");
1428 let opts = Emit::default();
1429 let html = field_html(&f, &Filling::default(), &opts);
1430 assert!(html.contains("aria-invalid=\"true\""), "{html}");
1431 // The selector the CSS side emits for exactly this state.
1432 assert!(crate::stylesheet(&opts).contains("[aria-invalid=\"true\"]"));
1433 // And the group is marked too, which a renderer without descendant
1434 // selectors depends on.
1435 assert!(html.contains("has-error"), "{html}");
1436 }
1437
1438 #[test]
1439 fn a_valid_field_claims_nothing_about_being_invalid() {
1440 let html = field_html(
1441 &field(FieldKind::Text),
1442 &Filling::default(),
1443 &Emit::default(),
1444 );
1445 assert!(!html.contains("aria-invalid"), "{html}");
1446 assert!(!html.contains("has-error"), "{html}");
1447 }
1448
1449 #[test]
1450 fn a_note_sits_between_the_hint_and_the_error_and_carries_its_tone() {
1451 let mut f = field(FieldKind::Text);
1452 f.hint = Some("Keep it short");
1453 f.note = Some((Tone::Warning, "Re-encoding drops embedded BWF"));
1454 f.error = Some("Required");
1455 let html = field_html(&f, &Filling::default(), &Emit::default());
1456
1457 // All three associated, in the order they are drawn.
1458 assert!(
1459 html.contains(r#"aria-describedby="title-hint title-note title-error""#),
1460 "{html}"
1461 );
1462 assert!(
1463 html.contains(r#"id="title-note" role="alert" data-tone="warning""#),
1464 "{html}"
1465 );
1466 // And in that order in the document, so the reading order matches.
1467 let hint = html.find("title-hint").unwrap();
1468 let note = html.rfind("title-note").unwrap();
1469 let err = html.rfind("title-error").unwrap();
1470 assert!(hint < note && note < err, "{html}");
1471 }
1472
1473 #[test]
1474 fn a_quiet_note_is_polite_and_wears_no_tone_attribute() {
1475 // Neutral is the bare class, matching every other toned component
1476 // here, and only Warning and Danger interrupt.
1477 let mut f = field(FieldKind::Text);
1478 f.note = Some((Tone::Info, "This is what that setting implies"));
1479 let html = field_html(&f, &Filling::default(), &Emit::default());
1480 assert!(html.contains(r#"role="status" data-tone="info""#), "{html}");
1481
1482 f.note = Some((Tone::Neutral, "An ordinary fact"));
1483 let html = field_html(&f, &Filling::default(), &Emit::default());
1484 assert!(html.contains(r#"id="title-note" role="status">"#), "{html}");
1485 assert!(!html.contains("data-tone"), "{html}");
1486 }
1487
1488 #[test]
1489 fn a_note_does_not_mark_the_group_invalid() {
1490 // `Field::invalid` stays `error.is_some()`, and the renderer's
1491 // `has-error` follows it rather than any message being present.
1492 let mut f = field(FieldKind::Text);
1493 f.note = Some((Tone::Danger, "This cannot be undone"));
1494 let html = field_html(&f, &Filling::default(), &Emit::default());
1495 assert!(!html.contains("has-error"), "{html}");
1496 assert!(!html.contains(r#"aria-invalid="true""#), "{html}");
1497 }
1498
1499 #[test]
1500 fn the_hint_survives_an_error_arriving() {
1501 let mut f = field(FieldKind::Text);
1502 f.hint = Some("Keep it short");
1503 f.error = Some("Required");
1504 let html = field_html(&f, &Filling::default(), &Emit::default());
1505 assert!(
1506 html.contains("aria-describedby=\"title-hint title-error\""),
1507 "{html}"
1508 );
1509 }
1510
1511 #[test]
1512 fn a_secret_never_carries_its_value_into_the_markup() {
1513 let filling = Filling::of(Value::Text("hunter2"));
1514 let html = field_html(&field(FieldKind::Secret), &filling, &Emit::default());
1515 assert!(!html.contains("hunter2"), "{html}");
1516 assert!(html.contains("type=\"password\""), "{html}");
1517 }
1518
1519 #[test]
1520 fn a_hidden_field_is_the_input_and_nothing_else() {
1521 let filling = Filling::of(Value::Text("42"));
1522 let html = field_html(&field(FieldKind::Hidden), &filling, &Emit::default());
1523 assert_eq!(html, "<input type=\"hidden\" name=\"title\" value=\"42\">");
1524 }
1525
1526 #[test]
1527 fn a_checkbox_labels_itself_and_takes_no_separate_label() {
1528 let html = field_html(
1529 &field(FieldKind::Checkbox),
1530 &Filling::of(Value::On(true)),
1531 &Emit::default(),
1532 );
1533 assert!(!html.contains("form-label"), "{html}");
1534 assert!(html.contains("checked"), "{html}");
1535 assert!(html.contains("<span>Title</span>"), "{html}");
1536 }
1537
1538 #[test]
1539 fn a_select_keeps_a_value_no_option_carries() {
1540 let options = [Choice::plain("1"), Choice::plain("3"), Choice::plain("7")];
1541 let f = Field::select("title", "Title", &options);
1542 let html = field_html(&f, &Filling::of(Value::Text("10")), &Emit::default());
1543 assert!(html.contains("data-unmatched=\"true\""), "{html}");
1544 // Selected, so the next save round-trips it rather than writing the
1545 // first option over the top of it.
1546 assert!(html.contains("<option value=\"10\" selected"), "{html}");
1547 }
1548
1549 #[test]
1550 fn a_select_with_no_options_emits_an_empty_select() {
1551 // The description says a select with no options is sayable, because an
1552 // app whose option list has not loaded has exactly that. Emitting the
1553 // empty select reports it on screen rather than in a log.
1554 let f = Field::select("title", "Title", &[]);
1555 let html = field_html(&f, &Filling::default(), &Emit::default());
1556 assert!(html.contains("<select"), "{html}");
1557 assert!(!html.contains("<option"), "{html}");
1558 }
1559
1560 #[test]
1561 fn an_unanswered_select_shows_its_ghost_text_and_cannot_be_chosen_back() {
1562 let options = [Choice::new("sp404", "SP-404")];
1563 let f = Field {
1564 placeholder: Some("Select device..."),
1565 ..Field::select("device", "Conform for device", &options)
1566 };
1567 let html = field_html(&f, &Filling::default(), &Emit::default());
1568
1569 assert!(
1570 html.contains("<option value=\"\" disabled selected>Select device...</option>"),
1571 "{html}"
1572 );
1573 // First, so the closed control reads it rather than the first real
1574 // option.
1575 assert!(
1576 html.find("Select device...") < html.find("SP-404"),
1577 "{html}"
1578 );
1579 }
1580
1581 #[test]
1582 fn an_answered_select_drops_the_ghost_text() {
1583 // It is an instruction about an empty field, so it has nothing to say
1584 // once the field is answered, and leaving it in the list is one dead
1585 // row every time the control is opened afterwards.
1586 let options = [Choice::new("sp404", "SP-404")];
1587 let f = Field {
1588 placeholder: Some("Select device..."),
1589 ..Field::select("device", "Conform for device", &options)
1590 };
1591 let html = field_html(&f, &Filling::of(Value::Text("sp404")), &Emit::default());
1592 assert!(!html.contains("Select device..."), "{html}");
1593 }
1594
1595 #[test]
1596 fn a_wrong_answer_is_kept_and_is_not_the_ghost_text() {
1597 // The two paths through `push_options` meet here. An unmatched value is
1598 // an answer that is wrong and stays visible as itself; only the empty
1599 // value is unanswered.
1600 let options = [Choice::plain("1"), Choice::plain("7")];
1601 let f = Field {
1602 placeholder: Some("Pick one"),
1603 ..Field::select("retention", "Keep backups for", &options)
1604 };
1605 let html = field_html(&f, &Filling::of(Value::Text("10")), &Emit::default());
1606 assert!(html.contains("data-unmatched=\"true\""), "{html}");
1607 assert!(!html.contains("Pick one"), "{html}");
1608 }
1609
1610 #[test]
1611 fn a_range_is_a_range_input_and_carries_its_extent() {
1612 let f = Field {
1613 curve: Curve::Linear { step: Some("0.01") },
1614 ..Field::range("review", "Review above", "0", "1")
1615 };
1616 let html = field_html(&f, &Filling::of(Value::Text("0.72")), &Emit::default());
1617 assert!(html.contains("type=\"range\""), "{html}");
1618 assert!(html.contains("min=\"0\""), "{html}");
1619 assert!(html.contains("max=\"1\""), "{html}");
1620 // Without it the browser steps by 1 and a 0-to-1 question becomes a
1621 // two-position control.
1622 assert!(html.contains("step=\"0.01\""), "{html}");
1623 }
1624
1625 #[test]
1626 fn a_range_reads_its_granularity_off_the_curve_and_not_off_field_step() {
1627 // The 0.32.0 narrowing, at the renderer. `Field::step` on a range is a
1628 // site that has not been moved over, and emitting it would make the
1629 // control step by a number the curve never agreed to.
1630 let f = Field {
1631 step: Some("99"),
1632 ..Field::range("review", "Review above", "0", "1")
1633 };
1634 let html = field_html(&f, &Filling::of(Value::Text("0.5")), &Emit::default());
1635 assert!(!html.contains("step="), "{html}");
1636 }
1637
1638 #[test]
1639 fn a_unit_is_adjacent_text_and_the_control_points_at_it() {
1640 // Not decoration: the number and what it is measured in are one fact,
1641 // so the association is what makes this worth emitting at all.
1642 let f = Field {
1643 unit: Some("dBFS"),
1644 ..Field::range("threshold", "Threshold", "-96", "-20")
1645 };
1646 let html = field_html(&f, &Filling::of(Value::Text("-40")), &Emit::default());
1647 assert!(html.contains(r#"id="threshold-unit""#), "{html}");
1648 assert!(html.contains(">dBFS</span>"), "{html}");
1649 assert!(
1650 html.contains(r#"aria-describedby="threshold-unit""#),
1651 "{html}"
1652 );
1653 // The label is the question's name and keeps no unit in it.
1654 assert!(html.contains(">Threshold</label>"), "{html}");
1655 }
1656
1657 #[test]
1658 fn a_unit_takes_its_place_between_the_hint_and_the_error() {
1659 let f = Field {
1660 unit: Some("ms"),
1661 hint: Some("How long the fade runs."),
1662 error: Some("Too long."),
1663 ..Field::new(FieldKind::Number, "fade", "Fade")
1664 };
1665 let html = field_html(&f, &Filling::of(Value::Text("50")), &Emit::default());
1666 assert!(
1667 html.contains(r#"aria-describedby="fade-hint fade-unit fade-error""#),
1668 "{html}"
1669 );
1670 }
1671
1672 #[test]
1673 fn a_unit_on_a_kind_that_is_not_a_quantity_is_ignored() {
1674 // Sayable and ignored, the way `options` is on a kind that offers none.
1675 // The renderer asks the description which kinds are measurable rather
1676 // than keeping its own list.
1677 let f = Field {
1678 unit: Some("s"),
1679 ..Field::new(FieldKind::Text, "name", "Name")
1680 };
1681 let html = field_html(&f, &Filling::of(Value::Text("kick")), &Emit::default());
1682 assert!(!html.contains("name-unit"), "{html}");
1683 assert!(!html.contains("aria-describedby"), "{html}");
1684 }
1685
1686 #[test]
1687 fn a_unit_cannot_break_out_of_the_span_it_sits_in() {
1688 let f = Field {
1689 unit: Some("</span><script>"),
1690 ..Field::new(FieldKind::Number, "n", "N")
1691 };
1692 let html = field_html(&f, &Filling::of(Value::Text("1")), &Emit::default());
1693 assert!(!html.contains("<script>"), "{html}");
1694 assert!(html.contains("&lt;script&gt;"), "{html}");
1695 }
1696
1697 #[test]
1698 fn a_constant_ratio_curve_still_emits_a_linear_track() {
1699 // Honest shortfall rather than a silent one: HTML has no logarithmic
1700 // range input, so the browser draws the extent linearly. The value it
1701 // submits is still a value in the field's own units, which is what
1702 // every handler on this path reads. See the crate header.
1703 let f = Field {
1704 curve: Curve::Logarithmic {
1705 step: Some("0.001"),
1706 },
1707 ..Field::range("attack", "Attack", "0.001", "5")
1708 };
1709 let html = field_html(&f, &Filling::of(Value::Text("0.005")), &Emit::default());
1710 assert!(html.contains("type=\"range\""), "{html}");
1711 assert!(html.contains("min=\"0.001\""), "{html}");
1712 assert!(html.contains("max=\"5\""), "{html}");
1713 assert!(html.contains("step=\"0.001\""), "{html}");
1714 }
1715
1716 #[test]
1717 fn a_number_with_bounds_is_still_typed_into() {
1718 // The distinction the kind exists for, at the renderer where getting it
1719 // wrong is most visible: goingson's `min="1"` duration must not come
1720 // back as a slider.
1721 let f = Field {
1722 min: Some("1"),
1723 ..Field::new(FieldKind::Number, "minutes", "Minutes")
1724 };
1725 let html = field_html(&f, &Filling::of(Value::Text("30")), &Emit::default());
1726 assert!(html.contains("type=\"number\""), "{html}");
1727 assert!(!html.contains("type=\"range\""), "{html}");
1728 // And nothing invents a step for it.
1729 assert!(!html.contains("step="), "{html}");
1730 }
1731
1732 #[test]
1733 fn an_unavailable_option_is_disabled_and_says_why() {
1734 let options = [
1735 Choice::new("chromatic", "Chromatic"),
1736 Choice::new("multi", "Multi-sample").unless("Drop a second sample."),
1737 ];
1738 let f = Field::radio("mode", "Mode", &options);
1739 let html = field_html(&f, &Filling::of(Value::Text("chromatic")), &Emit::default());
1740
1741 assert!(html.contains(" disabled"), "{html}");
1742 assert!(html.contains("Drop a second sample."), "{html}");
1743 // The option is still offered: dropping it is what costs the user the
1744 // knowledge that the mode exists.
1745 assert!(html.contains("value=\"multi\""), "{html}");
1746 // And the reason is its own element, not run into the label.
1747 assert!(html.contains("form-option-reason"), "{html}");
1748 }
1749
1750 #[test]
1751 fn an_unavailable_select_option_carries_its_reason_in_its_text() {
1752 // A `<select>` gives an option no room for a second element, so the
1753 // reason has to be in the text or be unreadable without a pointer.
1754 let options = [Choice::new("multi", "Multi-sample").unless("Drop a second sample.")];
1755 let f = Field::select("mode", "Mode", &options);
1756 let html = field_html(&f, &Filling::default(), &Emit::default());
1757 assert!(
1758 html.contains(">Multi-sample: Drop a second sample.</option>"),
1759 "{html}"
1760 );
1761 assert!(html.contains("disabled"), "{html}");
1762 }
1763
1764 #[test]
1765 fn a_radio_group_is_named_by_its_label_instead_of_pointing_at_it() {
1766 // The association inverts, and getting it wrong is silent: a
1767 // `<label for>` aimed at a group points at no element, so the group
1768 // simply has no accessible name and nothing reports that.
1769 let options = [Choice::plain("copy"), Choice::plain("reference")];
1770 let f = Field::radio("storage", "Storage style", &options);
1771 let html = field_html(&f, &Filling::of(Value::Text("copy")), &Emit::default());
1772
1773 assert!(html.contains("id=\"storage-label\""), "{html}");
1774 assert!(!html.contains("for=\"storage\""), "{html}");
1775 assert!(html.contains("role=\"radiogroup\""), "{html}");
1776 assert!(html.contains("aria-labelledby=\"storage-label\""), "{html}");
1777 }
1778
1779 #[test]
1780 fn an_interval_is_one_labelled_group_holding_both_ends() {
1781 // The markup MNW's discover sidebar writes by hand, which is the
1782 // measurement that decided the member: `role="group"` naming the
1783 // question, two number boxes under it.
1784 let f = Field::interval("min_price", "max_price", "Price");
1785 let html = field_html(
1786 &f,
1787 &Filling::of(Value::Between {
1788 lower: "5",
1789 upper: "40",
1790 }),
1791 &Emit::default(),
1792 );
1793
1794 assert!(html.contains("role=\"group\""), "{html}");
1795 assert!(
1796 html.contains("aria-labelledby=\"min_price-label\""),
1797 "{html}"
1798 );
1799 assert!(html.contains("id=\"min_price-label\""), "{html}");
1800 assert!(!html.contains("for=\"min_price\""), "{html}");
1801 assert!(html.contains("name=\"min_price\""), "{html}");
1802 assert!(html.contains("name=\"max_price\""), "{html}");
1803 assert!(html.contains("value=\"5\""), "{html}");
1804 assert!(html.contains("value=\"40\""), "{html}");
1805 assert_eq!(html.matches("type=\"number\"").count(), 2, "{html}");
1806 }
1807
1808 #[test]
1809 fn both_ends_of_an_interval_take_the_whole_extent() {
1810 // The extent describes the axis rather than either end of it, so a
1811 // browser refuses the same values in both boxes.
1812 let f = Field {
1813 min: Some("0"),
1814 max: Some("300"),
1815 step: Some("1"),
1816 ..Field::interval("bpm_min", "bpm_max", "BPM")
1817 };
1818 let html = field_html(&f, &Filling::default(), &Emit::default());
1819
1820 assert_eq!(html.matches("min=\"0\"").count(), 2, "{html}");
1821 assert_eq!(html.matches("max=\"300\"").count(), 2, "{html}");
1822 assert_eq!(html.matches("step=\"1\"").count(), 2, "{html}");
1823 // Neither box holds anything, which is the open interval rather than an
1824 // empty form: no filter on this axis at all.
1825 assert_eq!(html.matches("value=\"\"").count(), 2, "{html}");
1826 }
1827
1828 #[test]
1829 fn an_interval_carries_the_fault_on_the_group_and_not_on_one_end() {
1830 // A crossed interval is wrong about the answer, and the answer is the
1831 // pair. This is the half two `Number` fields could not say.
1832 let f = Field {
1833 error: Some("The high end is below the low one."),
1834 hint: Some("Leave an end empty for no bound."),
1835 ..Field::interval("bpm_min", "bpm_max", "BPM")
1836 };
1837 let html = field_html(&f, &Filling::default(), &Emit::default());
1838
1839 assert_eq!(html.matches("aria-invalid=\"true\"").count(), 1, "{html}");
1840 let group = html.find("role=\"group\"").expect("group");
1841 let invalid = html.find("aria-invalid").expect("invalid");
1842 let first_input = html.find("<input").expect("input");
1843 assert!(invalid > group && invalid < first_input, "{html}");
1844 assert!(
1845 html.contains("aria-describedby=\"bpm_min-hint bpm_min-error\""),
1846 "{html}"
1847 );
1848 }
1849
1850 #[test]
1851 fn an_interval_with_one_end_named_draws_one_box() {
1852 // Drawn as described rather than repaired. Inventing a name for the
1853 // upper end would submit a parameter no handler reads, and
1854 // `Field::interval` is what makes the omission unsayable at the source.
1855 let f = Field::new(FieldKind::Interval, "bpm_min", "BPM");
1856 let html = field_html(&f, &Filling::default(), &Emit::default());
1857
1858 assert_eq!(html.matches("<input").count(), 1, "{html}");
1859 assert!(html.contains("name=\"bpm_min\""), "{html}");
1860 }
1861
1862 #[test]
1863 fn every_option_shares_the_name_and_only_the_current_one_is_checked() {
1864 // One `name` is what makes them one answer rather than three; distinct
1865 // ids are what keep each `<label>` wrapping its own input.
1866 let options = [
1867 Choice::plain("copy"),
1868 Choice::plain("reference"),
1869 Choice::plain("link"),
1870 ];
1871 let f = Field::radio("storage", "Storage style", &options);
1872 let html = field_html(&f, &Filling::of(Value::Text("reference")), &Emit::default());
1873
1874 assert_eq!(html.matches("name=\"storage\"").count(), 3, "{html}");
1875 assert_eq!(html.matches(" checked").count(), 1, "{html}");
1876 assert!(
1877 html.contains("value=\"reference\" checked"),
1878 "the checked one is the one held: {html}"
1879 );
1880 for index in 0..3 {
1881 assert!(html.contains(&format!("id=\"storage-{index}\"")), "{html}");
1882 }
1883 }
1884
1885 #[test]
1886 fn a_radio_group_carries_the_error_rather_than_any_one_option() {
1887 // What is wrong is the answer, not one of the alternatives, so marking
1888 // a single input invalid would say something false. Same reading
1889 // `Field::invalid` gives one level up.
1890 let options = [Choice::plain("copy"), Choice::plain("reference")];
1891 let f = Field {
1892 error: Some("Pick one."),
1893 hint: Some("Cannot be changed later."),
1894 ..Field::radio("storage", "Storage style", &options)
1895 };
1896 let html = field_html(&f, &Filling::default(), &Emit::default());
1897
1898 assert_eq!(html.matches("aria-invalid=\"true\"").count(), 1, "{html}");
1899 assert!(
1900 html.contains("aria-describedby=\"storage-hint storage-error\""),
1901 "{html}"
1902 );
1903 // The group is the element that carries them, so they land before the
1904 // first option rather than on it.
1905 let group = html.find("role=\"radiogroup\"").expect("group");
1906 let first = html.find("type=\"radio\"").expect("an option");
1907 assert!(group < first, "{html}");
1908 }
1909
1910 #[test]
1911 fn a_compulsory_radio_group_marks_every_option() {
1912 // How HTML says a group is compulsory: the constraint reads as
1913 // satisfied when any one of them is checked.
1914 let options = [Choice::plain("copy"), Choice::plain("reference")];
1915 let f = Field {
1916 required: true,
1917 ..Field::radio("storage", "Storage style", &options)
1918 };
1919 let html = field_html(&f, &Filling::default(), &Emit::default());
1920 assert_eq!(html.matches(" required").count(), 2, "{html}");
1921 }
1922
1923 #[test]
1924 fn a_radio_option_cannot_break_out_of_its_attribute() {
1925 // Values are `&str` and carry whatever the app put in them. The ids are
1926 // numbered rather than derived from the value for the same reason.
1927 let hostile = [Choice::new(
1928 "x\" onclick=alert(1) data-x=\"",
1929 "<script>alert(1)</script>",
1930 )];
1931 let f = Field::radio("storage", "Storage style", &hostile);
1932 let html = field_html(&f, &Filling::default(), &Emit::default());
1933
1934 // The payload survives as text; what must not survive is the quote
1935 // that would end the attribute and let the rest of it become markup.
1936 assert!(html.contains("value=\"x&quot; onclick=alert(1)"), "{html}");
1937 assert!(!html.contains("<script>"), "{html}");
1938 assert!(html.contains("id=\"storage-0\""), "{html}");
1939 }
1940
1941 #[test]
1942 fn a_radio_group_with_no_options_emits_an_empty_group() {
1943 // Same position the select takes, and the description's own.
1944 let f = Field::radio("storage", "Storage style", &[]);
1945 let html = field_html(&f, &Filling::default(), &Emit::default());
1946 assert!(html.contains("role=\"radiogroup\""), "{html}");
1947 assert!(!html.contains("type=\"radio\""), "{html}");
1948 }
1949
1950 #[test]
1951 fn a_placeholder_comes_off_the_description_and_is_escaped() {
1952 // It arrived in `Filling` until makeover-layout 0.8.0 and was never
1953 // covered here; it is a value in an attribute like any other.
1954 let f = Field {
1955 placeholder: Some("x\" onfocus=alert(1) autofocus=\""),
1956 ..field(FieldKind::Text)
1957 };
1958 let html = field_html(&f, &Filling::default(), &Emit::default());
1959 assert!(html.contains("placeholder=\""), "{html}");
1960 assert!(!html.contains("\" onfocus"), "{html}");
1961 }
1962
1963 #[test]
1964 fn a_select_marks_the_option_that_matches() {
1965 let options = [Choice::plain("1"), Choice::plain("3")];
1966 let f = Field::select("title", "Title", &options);
1967 let html = field_html(&f, &Filling::of(Value::Text("3")), &Emit::default());
1968 assert!(
1969 html.contains("<option value=\"3\" selected>3</option>"),
1970 "{html}"
1971 );
1972 assert!(html.contains("<option value=\"1\">1</option>"), "{html}");
1973 assert!(!html.contains("data-unmatched"), "{html}");
1974 }
1975
1976 #[test]
1977 fn a_textarea_carries_its_value_as_text_and_not_as_an_attribute() {
1978 let filling = Filling::of(Value::Text("two\nlines"));
1979 let html = field_html(&field(FieldKind::Textarea), &filling, &Emit::default());
1980 assert!(html.contains(">two\nlines</textarea>"), "{html}");
1981 }
1982
1983 #[test]
1984 fn a_markdown_field_is_a_textarea_that_says_what_its_value_is() {
1985 // The mark is the whole difference. Without it a described editor is a
1986 // plain box, and an enhancement looking for editors to upgrade has
1987 // nothing to find -- which is the state MNW's four hand-written section
1988 // editors would have had to keep living in.
1989 let filling = Filling::of(Value::Text("# Heading"));
1990 let html = field_html(&field(FieldKind::Rich), &filling, &Emit::default());
1991 assert!(html.contains("<textarea"), "{html}");
1992 assert!(html.contains(r#"data-format="markdown""#), "{html}");
1993 assert!(html.contains("># Heading</textarea>"), "{html}");
1994
1995 // A plain textarea claims nothing about its value, so the marker has to
1996 // be absent rather than present-and-different.
1997 let plain = field_html(&field(FieldKind::Textarea), &filling, &Emit::default());
1998 assert!(!plain.contains("data-format"), "{plain}");
1999
2000 // And it is not an input: the catch-all in `input_type` would have
2001 // degraded it to a single-line text box, which is the wrong shape for
2002 // markdown rather than a lossless fallback.
2003 assert!(!html.contains("<input"), "{html}");
2004 }
2005
2006 #[test]
2007 fn a_markdown_field_gets_the_preview_the_member_permits() {
2008 // The mark on its own is what 0.50.0 shipped, and nothing read it. What
2009 // a conversion needs is the pair MNW's `partial-item-text-editor.js`
2010 // already draws, so describing the field is not a way to lose it.
2011 let filling = Filling::of(Value::Text("# Heading"));
2012 let html = field_html(&field(FieldKind::Rich), &filling, &Emit::default());
2013 assert!(html.contains("data-editor-mode=\"write\""), "{html}");
2014 assert!(html.contains("data-editor-mode=\"preview\""), "{html}");
2015 assert!(html.contains("data-editor-preview"), "{html}");
2016 // Write is the mode a fresh editor is in, and the segment says so twice
2017 // because the sheet reads one and a screen reader reads the other.
2018 assert!(
2019 html.contains(
2020 "class=\"segment chosen\" data-editor-mode=\"write\" aria-pressed=\"true\""
2021 ),
2022 "{html}"
2023 );
2024 assert!(
2025 html.contains("data-editor-mode=\"preview\" aria-pressed=\"false\""),
2026 "{html}"
2027 );
2028 // The value is still the textarea's, and still text rather than an
2029 // attribute. The chrome sits around the control, not in place of it.
2030 assert!(html.contains("># Heading</textarea>"), "{html}");
2031 }
2032
2033 #[test]
2034 fn a_plain_textarea_gets_no_editor_chrome() {
2035 let filling = Filling::of(Value::Text("plain"));
2036 let html = field_html(&field(FieldKind::Textarea), &filling, &Emit::default());
2037 assert!(!html.contains("data-editor-mode"), "{html}");
2038 assert!(!html.contains("data-editor-preview"), "{html}");
2039 assert!(!html.contains("segment"), "{html}");
2040 }
2041
2042 #[test]
2043 fn nothing_the_editor_emits_renders_the_value_as_markup() {
2044 // The whole of this crate's half of the sanitising question: the pane is
2045 // empty, so no value reaches markup through it, and the host's own
2046 // renderer keeps the guarantee it already has.
2047 let filling = Filling::of(Value::Text("<img src=x onerror=alert(1)>"));
2048 let html = field_html(&field(FieldKind::Rich), &filling, &Emit::default());
2049 assert!(html.contains("data-editor-preview></div>"), "{html}");
2050 assert!(!html.contains("<img"), "{html}");
2051 assert!(
2052 html.contains("&lt;img src=x onerror=alert(1)&gt;"),
2053 "{html}"
2054 );
2055 }
2056
2057 #[test]
2058 fn the_editor_rules_gate_on_the_attribute_and_on_a_binding() {
2059 let css = editor_rules(&Emit::default());
2060 // Behind the attribute, which is the reason the mark is an attribute:
2061 // a class-keyed gate would be prefixed away from the enhancement that
2062 // selects on it.
2063 for line in css.lines().filter(|line| line.contains('{')) {
2064 assert!(line.contains("[data-format=\"markdown\"]"), "{line}");
2065 }
2066 // Nothing is hidden and no control appears until something binds the
2067 // editor. A reader with no script gets the textarea alone.
2068 assert!(
2069 css.contains(
2070 "[data-format=\"markdown\"] > .form-editor-modes {\n display: none;\n}"
2071 )
2072 );
2073 assert!(css.contains(
2074 "[data-format=\"markdown\"][data-ready] > .form-editor-modes {\n display: block;\n}"
2075 ));
2076 assert!(css.contains(
2077 "[data-ready][data-mode=\"preview\"] > .form-editor-preview {\n display: block;\n}"
2078 ));
2079 assert!(
2080 css.contains("[data-ready][data-mode=\"preview\"] > .field {\n display: none;\n}")
2081 );
2082 // No magnitude, the line this crate holds everywhere else.
2083 assert!(!css.contains("px"), "{css}");
2084 assert!(!css.contains("rem"), "{css}");
2085 }
2086
2087 /// The prefix reaches the chrome as well, and the gate deliberately does
2088 /// not: an app assembling the sheet with its own prefix still has the
2089 /// selector an enhancement finds the editors by.
2090 #[test]
2091 fn the_editor_chrome_is_prefixed_and_its_gate_is_not() {
2092 let opts = Emit {
2093 class_prefix: "mk-",
2094 ..Emit::default()
2095 };
2096 let html = field_html(&field(FieldKind::Rich), &Filling::default(), &opts);
2097 assert!(html.contains("class=\"mk-form-editor-modes\""), "{html}");
2098 assert!(html.contains("class=\"mk-form-editor-preview\""), "{html}");
2099 assert!(html.contains("class=\"mk-segment chosen\""), "{html}");
2100 assert!(html.contains("data-format=\"markdown\""), "{html}");
2101
2102 let css = editor_rules(&opts);
2103 assert!(css.contains(".mk-form-editor-modes"), "{css}");
2104 assert!(css.contains("[data-format=\"markdown\"]"), "{css}");
2105 }
2106
2107 /// Every class the editor puts in markup is one the generated sheet rules,
2108 /// which is `FACET_CLASSES`' obligation without a list to keep: these two
2109 /// have rules, so the vocabulary seal picks them up from the sheet itself.
2110 #[test]
2111 fn the_editor_classes_are_in_the_vocabulary() {
2112 let opts = Emit::default();
2113 let names = crate::vocabulary::names(&opts);
2114 for name in ["form-editor-modes", "form-editor-preview", "segment"] {
2115 assert!(names.contains(name), "{name} is not in the vocabulary");
2116 }
2117 }
2118
2119 #[test]
2120 fn the_class_prefix_reaches_the_markup_as_well_as_the_stylesheet() {
2121 let opts = Emit {
2122 class_prefix: "mk-",
2123 ..Emit::default()
2124 };
2125 let html = field_html(&field(FieldKind::Text), &Filling::default(), &opts);
2126 assert!(html.contains("class=\"mk-form-group\""), "{html}");
2127 assert!(html.contains("class=\"mk-field\""), "{html}");
2128 }
2129
2130 #[test]
2131 fn an_extended_field_says_so_and_leaves_the_disclosure_to_the_form() {
2132 let mut f = field(FieldKind::Text);
2133 f.extended = true;
2134 let html = field_html(&f, &Filling::default(), &Emit::default());
2135 assert!(html.contains("data-extended=\"true\""), "{html}");
2136 }
2137
2138 /// The prefix scopes the id and leaves the name alone. Prefixing the name
2139 /// too would change what the form submits, which is the failure this pair
2140 /// of assertions exists to catch rather than describe.
2141 #[test]
2142 fn the_id_prefix_scopes_the_id_and_never_the_name() {
2143 let mut f = field(FieldKind::Text);
2144 f.hint = Some("Keep it short");
2145 f.error = Some("Required");
2146 let filling = Filling {
2147 id_prefix: Some("form-modal-task-edit"),
2148 ..Filling::default()
2149 };
2150 let html = field_html(&f, &filling, &Emit::default());
2151
2152 assert!(
2153 html.contains(r#"id="form-modal-task-edit-title""#),
2154 "{html}"
2155 );
2156 assert!(html.contains(r#"name="title""#), "{html}");
2157 assert!(
2158 !html.contains(r#"name="form-modal-task-edit-title""#),
2159 "{html}"
2160 );
2161
2162 // The label and both associations follow the id, or they point at
2163 // nothing once the same form is on screen twice.
2164 assert!(
2165 html.contains(r#"for="form-modal-task-edit-title""#),
2166 "{html}"
2167 );
2168 assert!(
2169 html.contains(
2170 r#"aria-describedby="form-modal-task-edit-title-hint form-modal-task-edit-title-error""#
2171 ),
2172 "{html}"
2173 );
2174 assert!(
2175 html.contains(r#"id="form-modal-task-edit-title-hint""#),
2176 "{html}"
2177 );
2178 }
2179
2180 #[test]
2181 fn a_hidden_field_submits_its_bare_name_under_a_prefix() {
2182 let filling = Filling {
2183 value: Value::Text("42"),
2184 id_prefix: Some("scoped"),
2185 ..Filling::default()
2186 };
2187 let html = field_html(&field(FieldKind::Hidden), &filling, &Emit::default());
2188 assert_eq!(html, r#"<input type="hidden" name="title" value="42">"#);
2189 }
2190
2191 /// These three exist so a touch keyboard and the platform's validation
2192 /// arrive with the field. Emitting text for any of them is the regression
2193 /// the variants were added to prevent, so the type is asserted directly.
2194 #[test]
2195 fn a_constraint_becomes_the_browsers_own_attribute() {
2196 // makeover-layout 0.11.0's model: the description carries the rule and
2197 // each renderer emits its host's idiom for it. Enforcement is still
2198 // whoever validated's, and arrives back as `error`.
2199 let html = field_html(
2200 &Field {
2201 max_length: Some(100),
2202 min: Some("1"),
2203 max: Some("240"),
2204 required: true,
2205 ..Field::new(FieldKind::Number, "minutes", "Minutes")
2206 },
2207 &Filling::default(),
2208 &Emit::default(),
2209 );
2210 assert!(html.contains(r#"maxlength="100""#));
2211 assert!(html.contains(r#"min="1""#));
2212 assert!(html.contains(r#"max="240""#));
2213 assert!(html.contains(" required"));
2214 }
2215
2216 #[test]
2217 fn a_bound_is_emitted_as_written_and_escaped_like_anything_else() {
2218 // The bound is text because it is only a number for some of the kinds
2219 // that take one; goingson's own sites are a duration and a datetime.
2220 let html = field_html(
2221 &Field {
2222 min: Some("2026-08-09T14:30"),
2223 ..Field::new(FieldKind::Text, "starts", "Starts")
2224 },
2225 &Filling::default(),
2226 &Emit::default(),
2227 );
2228 assert!(html.contains(r#"min="2026-08-09T14:30""#));
2229 }
2230
2231 #[test]
2232 fn a_file_field_is_a_file_input() {
2233 // `844b5ae0`. A field that takes any file emits no `accept` at all,
2234 // which is the browser's own "any file". `accept=""` is a filter that
2235 // means nothing on one browser and everything on another.
2236 let html = field_html(
2237 &Field::new(FieldKind::File, "attachment", "Attachment"),
2238 &Filling::default(),
2239 &Emit::default(),
2240 );
2241 assert!(html.contains(r#"type="file""#));
2242 assert!(!html.contains("accept="));
2243 assert!(!html.contains("multiple"));
2244 // And it never carries a value: a file input's value is not settable
2245 // from markup, and the browser refuses one that tries.
2246 assert!(!html.contains("value="));
2247 }
2248
2249 #[test]
2250 fn an_accept_list_is_comma_joined_in_the_attributes_own_format() {
2251 // `f7261a5a`, makeover-layout 0.31.0. Each entry writes itself: a
2252 // family is its wildcard, a media type is itself, a suffix keeps its
2253 // leading dot and however many more it has.
2254 const MIXED: &[Accepted<'_>] = &[
2255 Accepted::Family(Family::Image),
2256 Accepted::Type("text/csv"),
2257 Accepted::Suffix(".tar.gz"),
2258 ];
2259 let html = field_html(
2260 &Field {
2261 multiple: true,
2262 ..Field::upload("drop", "Drop files", MIXED)
2263 },
2264 &Filling::default(),
2265 &Emit::default(),
2266 );
2267 assert!(
2268 html.contains(r#"accept="image/*,text/csv,.tar.gz""#),
2269 "{html}"
2270 );
2271 assert!(html.contains(" multiple"), "{html}");
2272 }
2273
2274 #[test]
2275 fn an_accept_entry_cannot_end_the_attribute_it_sits_in() {
2276 // The list reaches an attribute value, so it is escaped like every
2277 // other string that does. Nothing in the tree writes a quote into one;
2278 // that it cannot is the point.
2279 const HOSTILE: &[Accepted<'_>] = &[Accepted::Type(r#"image/x" onload="x"#)];
2280 let html = field_html(
2281 &Field::upload("cover", "Cover", HOSTILE),
2282 &Filling::default(),
2283 &Emit::default(),
2284 );
2285 assert!(!html.contains(r#"onload="x"#), "{html}");
2286 }
2287
2288 #[test]
2289 fn the_typed_text_kinds_keep_their_input_type() {
2290 for (kind, expected) in [
2291 (FieldKind::Email, "email"),
2292 (FieldKind::Url, "url"),
2293 (FieldKind::Tel, "tel"),
2294 (FieldKind::Date, "date"),
2295 (FieldKind::DateTime, "datetime-local"),
2296 ] {
2297 let html = field_html(&field(kind), &Filling::default(), &Emit::default());
2298 assert!(
2299 html.contains(&format!(r#"type="{expected}""#)),
2300 "{kind:?} emitted {html}"
2301 );
2302 }
2303 }
2304
2305 #[test]
2306 fn a_temporal_field_is_a_native_control_and_not_a_hinted_text_box() {
2307 // The regression this closes: described as text with a hint reading
2308 // "YYYY-MM-DD", which loses the picker, the platform's validation and
2309 // the touch keyboard, and asks prose to do all three.
2310 for kind in [FieldKind::Date, FieldKind::DateTime] {
2311 let html = field_html(&field(kind), &Filling::default(), &Emit::default());
2312 assert!(!html.contains(r#"type="text""#), "{kind:?} emitted {html}");
2313 }
2314 }
2315
2316 #[test]
2317 fn no_prefix_leaves_the_id_as_the_name() {
2318 let html = field_html(
2319 &field(FieldKind::Text),
2320 &Filling::default(),
2321 &Emit::default(),
2322 );
2323 assert!(html.contains(r#"id="title" name="title""#), "{html}");
2324 }
2325 }
2326