use crate::yui::{Element, RAW_CALL};
const ATTACHED: &[&str] = &["Grid.Row", "Grid.Column", "Grid.RowSpan", "Grid.ColumnSpan"];
fn err<T>(el: &Element, msg: impl std::fmt::Display) -> Result<T, String> {
Err(format!("line {}: <{}> {msg}", el.line, el.name))
}
fn num(v: &str) -> Option<f32> {
v.trim().parse::<f32>().ok().filter(|n| n.is_finite() && *n >= 0.0)
}
fn length(v: &str) -> Option<String> {
let v = v.trim();
if v.eq_ignore_ascii_case("auto") {
return Some("::yog_api::ui::Track::auto()".into());
}
if let Some(w) = v.strip_suffix('*') {
let w = if w.trim().is_empty() { Some(1.0) } else { num(w) }?;
return Some(format!("::yog_api::ui::Track::star({w:?})"));
}
num(v).map(|px| format!("::yog_api::ui::Track::px({px:?})"))
}
fn compact(el: &Element, key: &str, value: &str, what: &str) -> Result<Vec<String>, String> {
if value.trim_start().starts_with('{') {
return err(el, format_args!("{key}=\"{value}\": grid definitions can't be bound"));
}
value
.split(',')
.map(|part| {
length(part).ok_or_else(|| {
format!(
"line {}: <{}> {key}=\"{value}\": `{}` isn't a {what} size — expected Auto, *, 2* or pixels (26)",
el.line,
el.name,
part.trim()
)
})
})
.collect()
}
fn elements(prop: &Element, row: bool) -> Result<Vec<String>, String> {
let (def, size, min, max) = if row {
("RowDefinition", "height", "min_height", "max_height")
} else {
("ColumnDefinition", "width", "min_width", "max_width")
};
if !prop.attrs.is_empty() {
return err(prop, "takes no attributes");
}
let mut out = Vec::new();
for d in &prop.children {
if d.name != def {
return err(d, format_args!("isn't allowed in <{}> (expected <{def}>)", prop.name));
}
if !d.children.is_empty() {
return err(d, "can't have children");
}
for (k, _) in &d.attrs {
if ![size, min, max].contains(&k.as_str()) {
let lower = k.chars().next().is_some_and(char::is_uppercase).then(|| crate::yui::snake(k));
return match lower.filter(|l| [size, min, max].contains(&l.as_str())) {
Some(l) => err(d, format_args!("has no attribute `{k}` — .yui attributes are lowercase: {l}")),
None => err(d, format_args!("has no attribute `{k}` (expected {size}, {min}, {max})")),
};
}
}
let v = d.attr(size).unwrap_or("*");
let mut t = length(v).ok_or_else(|| {
format!(
"line {}: <{def}> {size}=\"{v}\": expected Auto, *, 2* or pixels (26)",
d.line
)
})?;
for (key, call) in [(min, "min"), (max, "max")] {
if let Some(v) = d.attr(key) {
let n = num(v).ok_or_else(|| format!("line {}: <{def}> {key}=\"{v}\": expected a number of pixels", d.line))?;
t.push_str(&format!(".{call}({n:?})"));
}
}
out.push(t);
}
Ok(out)
}
fn index(el: &Element, key: &str, v: &str, min: u16) -> Result<u16, String> {
v.trim()
.parse::<u16>()
.ok()
.filter(|n| *n >= min)
.ok_or_else(|| {
let what = if min == 0 { "a whole number (0 = the first)" } else { "a whole number, at least 1" };
format!("line {}: <{}> {key}=\"{v}\": expected {what}", el.line, el.name)
})
}
fn plural(n: usize, what: &str) -> String {
if n == 1 {
format!("1 {what}")
} else {
format!("{n} {what}s")
}
}
pub fn normalize(el: &mut Element) -> Result<(), String> {
let is_grid = el.name == "Grid";
let (mut rows, mut cols): (Option<Vec<String>>, Option<Vec<String>>) = (None, None);
let mut kept = Vec::with_capacity(el.children.len());
for child in std::mem::take(&mut el.children) {
let which = match child.name.as_str() {
"Grid.RowDefinitions" => Some(true),
"Grid.ColumnDefinitions" => Some(false),
n if n.starts_with("Grid.") => {
return err(&child, "isn't a Grid property (expected <Grid.RowDefinitions> or <Grid.ColumnDefinitions>)")
}
_ => None,
};
let Some(row) = which else {
kept.push(child);
continue;
};
if !is_grid {
return err(&child, format_args!("only goes directly inside a <Grid>, not <{}>", el.name));
}
let slot = if row { &mut rows } else { &mut cols };
if slot.is_some() {
return err(&child, "is given twice");
}
*slot = Some(elements(&child, row)?);
}
el.children = kept;
let mut calls = Vec::new();
if is_grid {
let mut attrs = Vec::new();
for (k, v) in std::mem::take(&mut el.attrs) {
match k.as_str() {
"rows" | "columns" => {
let row = k == "rows";
let slot = if row { &mut rows } else { &mut cols };
if slot.is_some() {
let prop = if row { "Grid.RowDefinitions" } else { "Grid.ColumnDefinitions" };
return err(el, format_args!("{k}=\"...\" and <{prop}> both define the {k} — keep one"));
}
*slot = Some(compact(el, &k, &v, if row { "row" } else { "column" })?);
}
"row_spacing" | "column_spacing" => {
let n = num(&v).ok_or_else(|| format!("line {}: <Grid> {k}=\"{v}\": expected a number of pixels", el.line))?;
let m = if k == "row_spacing" { "row_spacing" } else { "col_spacing" };
calls.push(format!("{m}({n:?})"));
}
_ => attrs.push((k, v)),
}
}
el.attrs = attrs;
if let Some(r) = &rows {
calls.push(format!("rows([{}])", r.join(", ")));
}
if let Some(c) = &cols {
calls.push(format!("cols([{}])", c.join(", ")));
}
}
push_calls(el, calls, "g");
let (n_rows, n_cols) = (rows.as_ref().map_or(1, Vec::len), cols.as_ref().map_or(1, Vec::len));
for child in &mut el.children {
let mut cell = [0u16, 0, 1, 1];
let mut any = false;
let mut attrs = Vec::new();
for (k, v) in std::mem::take(&mut child.attrs) {
let Some(i) = ATTACHED.iter().position(|a| *a == k) else {
if k.starts_with("Grid.") {
return err(child, format_args!("has no attribute `{k}` (attached: {})", ATTACHED.join(", ")));
}
attrs.push((k, v));
continue;
};
if !is_grid {
return err(child, format_args!("{k}: only children of a <Grid> have grid cells (this is in a <{}>)", el.name));
}
if v.trim_start().starts_with('{') {
return err(child, format_args!("{k}=\"{v}\": grid cells can't be bound"));
}
cell[i] = index(child, &k, &v, if i < 2 { 0 } else { 1 })?;
any = true;
}
child.attrs = attrs;
if !is_grid {
continue;
}
let [r, c, rs, cs] = cell;
for (start, span, n, what, key) in [
(r, rs, n_rows, "row", "Grid.Row"),
(c, cs, n_cols, "column", "Grid.Column"),
] {
let (start, span) = (start as usize, span as usize);
if start >= n {
return err(
child,
format_args!("{key}=\"{start}\" is past the grid's last {what} (it has {}, numbered from 0)", plural(n, what)),
);
}
if start + span > n {
return err(
child,
format_args!(
"{key}Span=\"{span}\" from {what} {start} runs past the grid's last {what} (it has {})",
plural(n, what)
),
);
}
}
if any {
let mut calls = vec![format!("cell({r}, {c})")];
if (rs, cs) != (1, 1) {
calls.push(format!("span({rs}, {cs})"));
}
push_calls(child, calls, "c");
}
}
for child in &mut el.children {
normalize(child)?;
}
Ok(())
}
fn push_calls(el: &mut Element, calls: Vec<String>, tag: &str) {
for (i, c) in calls.into_iter().enumerate() {
el.attrs.push((format!("{RAW_CALL}{tag}{i}"), c));
}
}
#[cfg(test)]
mod tests {
use crate::yui;
fn gen(body: &str) -> Result<String, String> {
yui::generate(&format!("<Screen id=\"m:s\" width=\"100\" height=\"100\">{body}</Screen>"), "s")
}
#[test]
fn compact_and_element_forms() {
let code = gen(
r#"<Grid rows="Auto, *, 26" row_spacing="2" column_spacing="4">
<Grid.ColumnDefinitions>
<ColumnDefinition width="2*" min_width="80"/>
<ColumnDefinition max_width="200"/>
</Grid.ColumnDefinitions>
<Label text="a" Grid.Row="1" Grid.Column="1" halign="right" margin="2 4"/>
<Label text="b" Grid.RowSpan="3"/>
<Label text="c"/>
</Grid>"#,
)
.unwrap();
assert!(code.contains("widget::grid()"), "{code}");
assert!(code.contains(".row_spacing(2.0)"), "{code}");
assert!(code.contains(".col_spacing(4.0)"), "{code}");
assert!(
code.contains(".rows([::yog_api::ui::Track::auto(), ::yog_api::ui::Track::star(1.0), ::yog_api::ui::Track::px(26.0)])"),
"{code}"
);
assert!(
code.contains(".cols([::yog_api::ui::Track::star(2.0).min(80.0), ::yog_api::ui::Track::star(1.0).max(200.0)])"),
"{code}"
);
assert!(code.contains(".cell(1, 1)"), "{code}");
assert!(code.contains(".halign(::yog_api::ui::HAlign::Right)"), "{code}");
assert!(code.contains(".margin(2.0, 4.0, 2.0, 4.0)"), "{code}");
assert!(code.contains(".cell(0, 0)\n") && code.contains(".span(3, 1)"), "{code}");
}
#[test]
fn errors() {
let e = |body: &str| gen(body).unwrap_err();
assert!(e(r#"<Grid rows="abc"/>"#).contains("`abc` isn't a row size"));
assert!(e(r#"<Grid><Grid.RowDefinitions><RowDefinition Height="Auto"/></Grid.RowDefinitions></Grid>"#)
.contains("lowercase: height"));
assert!(e(r#"<Grid><Grid.RowDefinitions><RowDefinition height="x"/></Grid.RowDefinitions></Grid>"#)
.contains("height=\"x\""));
assert!(e(r#"<Grid rows="*,*"><Label Grid.Row="2"/></Grid>"#).contains("past the grid's last row (it has 2 rows"));
assert!(e(r#"<Grid columns="*,*"><Label Grid.Column="1" Grid.ColumnSpan="2"/></Grid>"#)
.contains("Grid.ColumnSpan=\"2\" from column 1"));
assert!(e(r#"<Grid><Label Grid.Row="1"/></Grid>"#).contains("it has 1 row,"));
assert!(e(r#"<Column><Label Grid.Row="0"/></Column>"#).contains("only children of a <Grid>"));
assert!(e(r#"<Grid rows="*"><Grid.RowDefinitions/></Grid>"#).contains("keep one"));
assert!(e(r#"<Column><Grid.RowDefinitions/></Column>"#).contains("directly inside a <Grid>"));
assert!(e(r#"<Grid><Label Grid.RowSpan="0"/></Grid>"#).contains("at least 1"));
assert!(e(r#"<Grid><Label HorizontalAlignment="Left"/></Grid>"#).contains("halign"));
assert!(e(r#"<Grid><Label halign="middle"/></Grid>"#).contains("left, center, right, stretch"));
}
}