Some table improvements [More flexible tables] (#3473)

4 files changed, 77 insertions, 32 deletions

diff --git a/crates/typst/src/layout/grid/layout.rs b/crates/typst/src/layout/grid/layout.rs
index 790aedac..543d736d 100644
--- a/crates/typst/src/layout/grid/layout.rs
+++ b/crates/typst/src/layout/grid/layout.rs
@@ -332,7 +332,7 @@ impl CellGrid {
         items: I,
         fill: &Celled<Option<Paint>>,
         align: &Celled<Smart<Alignment>>,
-        inset: Sides<Option<Rel<Length>>>,
+        inset: &Celled<Sides<Option<Rel<Length>>>>,
         stroke: &ResolvedCelled<Sides<Option<Option<Arc<Stroke>>>>>,
         engine: &mut Engine,
         styles: StyleChain,
@@ -486,7 +486,7 @@ impl CellGrid {
                 y,
                 &fill.resolve(engine, x, y)?,
                 align.resolve(engine, x, y)?,
-                inset,
+                inset.resolve(engine, x, y)?,
                 stroke.resolve(engine, styles, x, y)?,
                 styles,
             );
@@ -572,7 +572,7 @@ impl CellGrid {
                         y,
                         &fill.resolve(engine, x, y)?,
                         align.resolve(engine, x, y)?,
-                        inset,
+                        inset.resolve(engine, x, y)?,
                         stroke.resolve(engine, styles, x, y)?,
                         styles,
                     );
diff --git a/crates/typst/src/layout/grid/lines.rs b/crates/typst/src/layout/grid/lines.rs
index 9a4da26d..6eb43c9a 100644
--- a/crates/typst/src/layout/grid/lines.rs
+++ b/crates/typst/src/layout/grid/lines.rs
@@ -130,7 +130,7 @@ where
             &CellGrid,
             usize,
             usize,
-            Option<Arc<Stroke<Abs>>>,
+            Option<Option<Arc<Stroke<Abs>>>>,
         ) -> Option<(Arc<Stroke<Abs>>, StrokePriority)>
         + 'grid,
     I: IntoIterator<Item = (usize, Abs)>,
@@ -204,7 +204,7 @@ where
             // Get the expected line stroke at this track by folding the
             // strokes of each user-specified line (with priority to the
             // user-specified line specified last).
-            let stroke = lines
+            let mut line_strokes = lines
                 .iter()
                 .filter(|line| {
                     line.position == expected_line_position
@@ -222,8 +222,15 @@ where
                             })
                             .unwrap_or_else(|| track >= gutter_factor * line.start)
                 })
-                .map(|line| line.stroke.clone())
-                .fold(None, |acc, line_stroke| line_stroke.fold(acc));
+                .map(|line| line.stroke.clone());
+
+            // Distinguish between unspecified stroke (None, if no lines
+            // were matched above) and specified stroke of None (Some(None),
+            // if some lines were matched and the one specified last had a
+            // stroke of None) by conditionally folding after 'next()'.
+            let line_stroke = line_strokes.next().map(|first_stroke| {
+                line_strokes.fold(first_stroke, |acc, line_stroke| line_stroke.fold(acc))
+            });
 
             // The function shall determine if it is appropriate to draw
             // the line at this position or not (i.e. whether or not it
@@ -240,7 +247,7 @@ where
             // (which indicates, in the context of 'std::iter::from_fn', that
             // our iterator isn't over yet, and this should be its next value).
             if let Some((stroke, priority)) =
-                line_stroke_at_track(grid, index, track, stroke)
+                line_stroke_at_track(grid, index, track, line_stroke)
             {
                 // We should draw at this position. Let's check if we were
                 // already drawing in the previous position.
@@ -301,9 +308,10 @@ where
 }
 
 /// Returns the correct stroke with which to draw a vline right before column
-/// 'x' when going through row 'y', given the stroke of the user-specified line
-/// at this position, if any. Also returns the stroke's drawing priority, which
-/// depends on its source.
+/// `x` when going through row `y`, given the stroke of the user-specified line
+/// at this position, if any (note that a stroke of `None` is unspecified,
+/// while `Some(None)` means specified to remove any stroke at this position).
+/// Also returns the stroke's drawing priority, which depends on its source.
 ///
 /// If the vline would go through a colspan, returns None (shouldn't be drawn).
 /// If the one (when at the border) or two (otherwise) cells to the left and
@@ -317,12 +325,12 @@ where
 /// stroke, as defined by user-specified lines (if any), is returned.
 ///
 /// The priority associated with the returned stroke follows the rules
-/// described in the docs for 'generate_line_segment'.
+/// described in the docs for `generate_line_segment`.
 pub(super) fn vline_stroke_at_row(
     grid: &CellGrid,
     x: usize,
     y: usize,
-    stroke: Option<Arc<Stroke<Abs>>>,
+    stroke: Option<Option<Arc<Stroke<Abs>>>>,
 ) -> Option<(Arc<Stroke<Abs>>, StrokePriority)> {
     if x != 0 && x != grid.cols.len() {
         // When the vline isn't at the border, we need to check if a colspan would
@@ -397,15 +405,16 @@ pub(super) fn vline_stroke_at_row(
     // Fold the line stroke and folded cell strokes, if possible.
     // Give priority to the explicit line stroke.
     // Otherwise, use whichever of the two isn't 'none' or unspecified.
-    let final_stroke = stroke.fold_or(cell_stroke);
+    let final_stroke = stroke.fold_or(Some(cell_stroke)).flatten();
 
     final_stroke.zip(Some(priority))
 }
 
-/// Returns the correct stroke with which to draw a hline on top of row 'y'
-/// when going through column 'x', given the stroke of the user-specified line
-/// at this position, if any. Also returns the stroke's drawing priority, which
-/// depends on its source.
+/// Returns the correct stroke with which to draw a hline on top of row `y`
+/// when going through column `x`, given the stroke of the user-specified line
+/// at this position, if any (note that a stroke of `None` is unspecified,
+/// while `Some(None)` means specified to remove any stroke at this position).
+/// Also returns the stroke's drawing priority, which depends on its source.
 ///
 /// If the one (when at the border) or two (otherwise) cells above and below
 /// the hline have bottom and top stroke overrides, respectively, then the
@@ -418,12 +427,12 @@ pub(super) fn vline_stroke_at_row(
 /// defined by user-specified lines (if any), is directly returned.
 ///
 /// The priority associated with the returned stroke follows the rules
-/// described in the docs for 'generate_line_segment'.
+/// described in the docs for `generate_line_segment`.
 pub(super) fn hline_stroke_at_column(
     grid: &CellGrid,
     y: usize,
     x: usize,
-    stroke: Option<Arc<Stroke<Abs>>>,
+    stroke: Option<Option<Arc<Stroke<Abs>>>>,
 ) -> Option<(Arc<Stroke<Abs>>, StrokePriority)> {
     // There are no rowspans yet, so no need to add a check here. The line will
     // always be drawn, if it has a stroke.
@@ -505,7 +514,7 @@ pub(super) fn hline_stroke_at_column(
     // Fold the line stroke and folded cell strokes, if possible.
     // Give priority to the explicit line stroke.
     // Otherwise, use whichever of the two isn't 'none' or unspecified.
-    let final_stroke = stroke.fold_or(cell_stroke);
+    let final_stroke = stroke.fold_or(Some(cell_stroke)).flatten();
 
     final_stroke.zip(Some(priority))
 }
diff --git a/crates/typst/src/layout/grid/mod.rs b/crates/typst/src/layout/grid/mod.rs
index 0ddecd84..fc884e80 100644
--- a/crates/typst/src/layout/grid/mod.rs
+++ b/crates/typst/src/layout/grid/mod.rs
@@ -10,7 +10,7 @@ use std::sync::Arc;
 use ecow::eco_format;
 use smallvec::{smallvec, SmallVec};
 
-use crate::diag::{SourceResult, StrResult, Trace, Tracepoint};
+use crate::diag::{bail, SourceResult, StrResult, Trace, Tracepoint};
 use crate::engine::Engine;
 use crate::foundations::{
     cast, elem, scope, Array, Content, Fold, Packed, Show, Smart, StyleChain, Value,
@@ -19,6 +19,7 @@ use crate::layout::{
     Abs, AlignElem, Alignment, Axes, Dir, Fragment, LayoutMultiple, Length,
     OuterHAlignment, OuterVAlignment, Regions, Rel, Sides, Sizing,
 };
+use crate::model::{TableCell, TableHLine, TableVLine};
 use crate::syntax::Span;
 use crate::text::TextElem;
 use crate::util::NonZeroExt;
@@ -270,7 +271,7 @@ pub struct GridElem {
     /// )
     /// ```
     #[fold]
-    pub inset: Sides<Option<Rel<Length>>>,
+    pub inset: Celled<Sides<Option<Rel<Length>>>>,
 
     /// The contents of the grid cells, plus any extra grid lines specified
     /// with the [`grid.hline`]($grid.hline) and [`grid.vline`]($grid.vline)
@@ -353,7 +354,7 @@ impl LayoutMultiple for Packed<GridElem> {
             items,
             fill,
             align,
-            inset,
+            &inset,
             &stroke,
             engine,
             styles,
@@ -395,7 +396,24 @@ cast! {
         Self::VLine(vline) => vline.into_value(),
         Self::Cell(cell) => cell.into_value(),
     },
-    v: Content => v.into(),
+    v: Content => {
+        if v.is::<TableCell>() {
+            bail!(
+                "cannot use `table.cell` as a grid cell; use `grid.cell` instead"
+            );
+        }
+        if v.is::<TableHLine>() {
+            bail!(
+                "cannot use `table.hline` as a grid line; use `grid.hline` instead"
+            );
+        }
+        if v.is::<TableVLine>() {
+            bail!(
+                "cannot use `table.vline` as a grid line; use `grid.vline` instead"
+            );
+        }
+        v.into()
+    }
 }
 
 impl From<Content> for GridChild {
diff --git a/crates/typst/src/model/table.rs b/crates/typst/src/model/table.rs
index ae4dbce7..a51fd1e7 100644
--- a/crates/typst/src/model/table.rs
+++ b/crates/typst/src/model/table.rs
@@ -3,15 +3,16 @@ use std::sync::Arc;
 
 use ecow::eco_format;
 
-use crate::diag::{SourceResult, Trace, Tracepoint};
+use crate::diag::{bail, SourceResult, Trace, Tracepoint};
 use crate::engine::Engine;
 use crate::foundations::{
     cast, elem, scope, Content, Fold, Packed, Show, Smart, StyleChain,
 };
 use crate::layout::{
     show_grid_cell, Abs, Alignment, Axes, Cell, CellGrid, Celled, Dir, Fragment,
-    GridItem, GridLayouter, LayoutMultiple, Length, LinePosition, OuterHAlignment,
-    OuterVAlignment, Regions, Rel, ResolvableCell, Sides, TrackSizings,
+    GridCell, GridHLine, GridItem, GridLayouter, GridVLine, LayoutMultiple, Length,
+    LinePosition, OuterHAlignment, OuterVAlignment, Regions, Rel, ResolvableCell, Sides,
+    TrackSizings,
 };
 use crate::model::Figurable;
 use crate::syntax::Span;
@@ -200,8 +201,8 @@ pub struct TableElem {
     /// )
     /// ```
     #[fold]
-    #[default(Sides::splat(Some(Abs::pt(5.0).into())))]
-    pub inset: Sides<Option<Rel<Length>>>,
+    #[default(Celled::Value(Sides::splat(Some(Abs::pt(5.0).into()))))]
+    pub inset: Celled<Sides<Option<Rel<Length>>>>,
 
     /// The contents of the table cells, plus any extra table lines specified
     /// with the [`table.hline`]($table.hline) and
@@ -282,7 +283,7 @@ impl LayoutMultiple for Packed<TableElem> {
             items,
             fill,
             align,
-            inset,
+            &inset,
             &stroke,
             engine,
             styles,
@@ -349,7 +350,24 @@ cast! {
         Self::VLine(vline) => vline.into_value(),
         Self::Cell(cell) => cell.into_value(),
     },
-    v: Content => v.into(),
+    v: Content => {
+        if v.is::<GridCell>() {
+            bail!(
+                "cannot use `grid.cell` as a table cell; use `table.cell` instead"
+            );
+        }
+        if v.is::<GridHLine>() {
+            bail!(
+                "cannot use `grid.hline` as a table line; use `table.hline` instead"
+            );
+        }
+        if v.is::<GridVLine>() {
+            bail!(
+                "cannot use `grid.vline` as a table line; use `table.vline` instead"
+            );
+        }
+        v.into()
+    }
 }
 
 impl From<Content> for TableChild {