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feat: Add column-aligned table rendering for EPUBs

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Replace the "[Table omitted]" placeholder with full table rendering:

- Two-pass layout: buffer table content during SAX parsing, then
  calculate column widths and lay out cells after </table> closes
- Colspan support for cells spanning multiple columns
- Forced line breaks within cells (<br>, <p>, <div> etc.)
- Center-align full-width spanning rows (section headers/titles)
- Width hints from HTML attributes and CSS (col, td, th width)
- Two-pass fair-share column width distribution that prevents
  narrow columns from being excessively squeezed
- Double-encoded &nbsp; entity handling
- PageTableRow with grid-line rendering and serialization support
- Asymmetric vertical cell padding to balance font leading

Co-authored-by: Cursor <cursoragent@cursor.com>
This commit is contained in:
cottongin
2026-02-15 14:40:36 -05:00
parent 1383d75c84
commit 3096d6066b
9 changed files with 895 additions and 20 deletions
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14
lib/Epub/Epub/css/CssStyle.h
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@@ -69,6 +69,7 @@ struct CssPropertyFlags {
uint16_t paddingBottom : 1;
uint16_t paddingLeft : 1;
uint16_t paddingRight : 1;
uint16_t width : 1;
CssPropertyFlags()
: textAlign(0),
@@ -83,17 +84,19 @@ struct CssPropertyFlags {
paddingTop(0),
paddingBottom(0),
paddingLeft(0),
paddingRight(0) {}
paddingRight(0),
width(0) {}
[[nodiscard]] bool anySet() const {
return textAlign || fontStyle || fontWeight || textDecoration || textIndent || marginTop || marginBottom ||
marginLeft || marginRight || paddingTop || paddingBottom || paddingLeft || paddingRight;
marginLeft || marginRight || paddingTop || paddingBottom || paddingLeft || paddingRight || width;
}
void clearAll() {
textAlign = fontStyle = fontWeight = textDecoration = textIndent = 0;
marginTop = marginBottom = marginLeft = marginRight = 0;
paddingTop = paddingBottom = paddingLeft = paddingRight = 0;
width = 0;
}
};
@@ -115,6 +118,7 @@ struct CssStyle {
CssLength paddingBottom; // Padding after
CssLength paddingLeft; // Padding left
CssLength paddingRight; // Padding right
CssLength width; // Element width (used for table columns/cells)
CssPropertyFlags defined; // Tracks which properties were explicitly set
@@ -173,6 +177,10 @@ struct CssStyle {
paddingRight = base.paddingRight;
defined.paddingRight = 1;
}
if (base.hasWidth()) {
width = base.width;
defined.width = 1;
}
}
[[nodiscard]] bool hasTextAlign() const { return defined.textAlign; }
@@ -188,6 +196,7 @@ struct CssStyle {
[[nodiscard]] bool hasPaddingBottom() const { return defined.paddingBottom; }
[[nodiscard]] bool hasPaddingLeft() const { return defined.paddingLeft; }
[[nodiscard]] bool hasPaddingRight() const { return defined.paddingRight; }
[[nodiscard]] bool hasWidth() const { return defined.width; }
void reset() {
textAlign = CssTextAlign::Left;
@@ -197,6 +206,7 @@ struct CssStyle {
textIndent = CssLength{};
marginTop = marginBottom = marginLeft = marginRight = CssLength{};
paddingTop = paddingBottom = paddingLeft = paddingRight = CssLength{};
width = CssLength{};
defined.clearAll();
}
};