Rewrote reader layout engine. Adds real table support.

.github/workflows/branch_apk.yml

@@ -3,7 +3,7 @@ name: Signed APKs
 on:
   push:
     branches:
-      - upgrades
+      - table-layout
 
 jobs:
   signed_apk:

app/src/main/java/com/nononsenseapps/feeder/model/html/LinearStuff.kt

@@ -0,0 +1,340 @@
+package com.nononsenseapps.feeder.model.html
+
+import androidx.collection.ArrayMap
+
+data class LinearArticle(
+    val elements: List<LinearElement>,
+)
+
+/**
+ * A linear element can contain other linear elements
+ */
+sealed interface LinearElement
+
+/**
+ * Represents a list of items, ordered or unordered
+ */
+data class LinearList(
+    val ordered: Boolean,
+    val items: List<LinearListItem>,
+) : LinearElement {
+    fun isEmpty(): Boolean {
+        return items.isEmpty()
+    }
+
+    fun isNotEmpty(): Boolean {
+        return items.isNotEmpty()
+    }
+
+    class Builder(private val ordered: Boolean) {
+        private val items: MutableList<LinearListItem> = mutableListOf()
+
+        fun add(item: LinearListItem) {
+            items.add(item)
+        }
+
+        fun build(): LinearList {
+            return LinearList(ordered, items)
+        }
+    }
+
+    companion object {
+        fun build(
+            ordered: Boolean,
+            block: Builder.() -> Unit,
+        ): LinearList {
+            return Builder(ordered).apply(block).build()
+        }
+    }
+}
+
+/**
+ * Represents a single item in a list
+ */
+data class LinearListItem(
+    val content: List<LinearElement>,
+) {
+    constructor(block: ListBuilderScope<LinearElement>.() -> Unit) : this(content = ListBuilderScope(block).items)
+
+    constructor(vararg elements: LinearElement) : this(content = elements.toList())
+
+    fun isEmpty(): Boolean {
+        return content.isEmpty()
+    }
+
+    fun isNotEmpty(): Boolean {
+        return content.isNotEmpty()
+    }
+
+    class Builder {
+        private val content: MutableList<LinearElement> = mutableListOf()
+
+        fun add(element: LinearElement) {
+            content.add(element)
+        }
+
+        fun build(): LinearListItem {
+            return LinearListItem(content)
+        }
+    }
+
+    companion object {
+        fun build(block: Builder.() -> Unit): LinearListItem {
+            return Builder().apply(block).build()
+        }
+    }
+}
+
+/**
+ * Represents a table
+ */
+data class LinearTable(
+    val rowCount: Int,
+    val colCount: Int,
+    private val cellsReal: ArrayMap<Coordinate, LinearTableCellItem>,
+) : LinearElement {
+    val cells: Map<Coordinate, LinearTableCellItem>
+        get() = cellsReal
+
+    constructor(
+        rowCount: Int,
+        colCount: Int,
+        cells: List<LinearTableCellItem>,
+    ) : this(
+        rowCount,
+        colCount,
+        ArrayMap<Coordinate, LinearTableCellItem>().apply {
+            cells.forEachIndexed { index, item ->
+                put(Coordinate(row = index / colCount, col = index % colCount), item)
+            }
+        },
+    )
+
+    fun cellAt(
+        row: Int,
+        col: Int,
+    ): LinearTableCellItem? {
+        return cells[Coordinate(row = row, col = col)]
+    }
+
+    class Builder {
+        private val cells: ArrayMap<Coordinate, LinearTableCellItem> = ArrayMap()
+        private var rowCount: Int = 0
+        private var colCount: Int = 0
+        private var currentRowColCount = 0
+        private var currentRow = 0
+
+        fun add(element: LinearTableCellItem) {
+            check(rowCount > 0) { "Must add a row before adding cells" }
+
+            // First find the first empty cell in this row
+            var cellCoord = Coordinate(row = currentRow, col = currentRowColCount)
+            while (cells[cellCoord] != null) {
+                currentRowColCount++
+                cellCoord = cellCoord.copy(col = currentRowColCount)
+            }
+
+            currentRowColCount += element.colSpan
+            if (currentRowColCount > colCount) {
+                colCount = currentRowColCount
+            }
+
+            cells[cellCoord] = element
+
+            // Insert filler elements for spanned cells
+            for (r in 0 until element.rowSpan) {
+                for (c in 0 until element.colSpan) {
+                    // Skip first since this is the cell itself
+                    if (r == 0 && c == 0) {
+                        continue
+                    }
+
+                    val fillerCoord = Coordinate(row = currentRow + r, col = currentRowColCount - element.colSpan + c)
+                    check(cells[fillerCoord] == null) { "Cell at filler $fillerCoord already exists" }
+                    cells[fillerCoord] = LinearTableCellItem.filler
+                }
+            }
+        }
+
+        fun newRow() {
+            if (rowCount > 0) {
+                currentRow++
+            }
+            rowCount++
+            currentRowColCount = 0
+        }
+
+        fun build(): LinearTable {
+            return LinearTable(rowCount, colCount, cells)
+        }
+    }
+
+    companion object {
+        fun build(block: Builder.() -> Unit): LinearTable {
+            return Builder().apply(block).build()
+        }
+    }
+}
+
+data class Coordinate(
+    val row: Int,
+    val col: Int,
+)
+
+/**
+ * Represents a single cell in a table
+ */
+data class LinearTableCellItem(
+    val type: LinearTableCellItemType,
+    val colSpan: Int,
+    val rowSpan: Int,
+    val content: List<LinearElement>,
+) {
+    constructor(
+        colSpan: Int,
+        rowSpan: Int,
+        type: LinearTableCellItemType,
+        block: ListBuilderScope<LinearElement>.() -> Unit,
+    ) : this(colSpan = colSpan, rowSpan = rowSpan, type = type, content = ListBuilderScope(block).items)
+
+    val isFiller
+        get() = colSpan == filler.colSpan && rowSpan == filler.rowSpan
+
+    class Builder(
+        private val colSpan: Int,
+        private val rowSpan: Int,
+        private val type: LinearTableCellItemType,
+    ) {
+        private val content: MutableList<LinearElement> = mutableListOf()
+
+        fun add(element: LinearElement) {
+            content.add(element)
+        }
+
+        fun build(): LinearTableCellItem {
+            return LinearTableCellItem(colSpan = colSpan, rowSpan = rowSpan, type = type, content = content)
+        }
+    }
+
+    companion object {
+        fun build(
+            colSpan: Int,
+            rowSpan: Int,
+            type: LinearTableCellItemType,
+            block: Builder.() -> Unit,
+        ): LinearTableCellItem {
+            return Builder(colSpan = colSpan, rowSpan = rowSpan, type = type).apply(block).build()
+        }
+
+        val filler =
+            LinearTableCellItem(
+                type = LinearTableCellItemType.DATA,
+                colSpan = -1,
+                rowSpan = -1,
+                content = emptyList(),
+            )
+    }
+}
+
+enum class LinearTableCellItemType {
+    HEADER,
+    DATA,
+}
+
+data class LinearBlockQuote(
+    val cite: String?,
+    val content: List<LinearElement>,
+) : LinearElement {
+    constructor(cite: String?, block: ListBuilderScope<LinearElement>.() -> Unit) : this(cite = cite, content = ListBuilderScope(block).items)
+
+    constructor(cite: String?, vararg elements: LinearElement) : this(cite = cite, content = elements.toList())
+}
+
+/**
+ * Primitives can not contain other elements
+ */
+sealed interface LinearPrimitive : LinearElement
+
+/**
+ * Represents a text element. For example a paragraph, or a header.
+ */
+data class LinearText(
+    val text: String,
+    val annotations: List<LinearTextAnnotation>,
+    val blockStyle: LinearTextBlockStyle,
+) : LinearPrimitive {
+    constructor(text: String, blockStyle: LinearTextBlockStyle, vararg annotations: LinearTextAnnotation) : this(text = text, blockStyle = blockStyle, annotations = annotations.toList())
+}
+
+enum class LinearTextBlockStyle {
+    TEXT,
+    PRE_FORMATTED,
+    CODE_BLOCK,
+}
+
+val LinearTextBlockStyle.shouldSoftWrap: Boolean
+    get() = this == LinearTextBlockStyle.TEXT
+
+/**
+ * Represents an image element
+ */
+data class LinearImage(
+    val sources: List<LinearImageSource>,
+    val caption: LinearText?,
+    val link: String?,
+) : LinearElement
+
+data class LinearImageSource(
+    val imgUri: String,
+    val widthPx: Int?,
+    val heightPx: Int?,
+    val pixelDensity: Float?,
+    val screenWidth: Int?,
+)
+
+/**
+ * Represents a video element
+ */
+data class LinearVideo(
+    val sources: List<LinearVideoSource>,
+) : LinearElement {
+    init {
+        require(sources.isNotEmpty()) { "At least one source must be provided" }
+    }
+
+    val imageThumbnail: String? by lazy {
+        sources.firstOrNull { it.imageThumbnail != null }?.imageThumbnail
+    }
+
+    val firstSource: LinearVideoSource
+        get() = sources.first()
+}
+
+data class LinearVideoSource(
+    val uri: String,
+    // This might be different from the uri, for example for youtube videos where uri is the embed uri
+    val link: String,
+    val imageThumbnail: String?,
+    val widthPx: Int?,
+    val heightPx: Int?,
+    val mimeType: String?,
+)
+
+/**
+ * Represents an audio element
+ */
+data class LinearAudio(
+    val sources: List<LinearAudioSource>,
+) : LinearElement {
+    init {
+        require(sources.isNotEmpty()) { "At least one source must be provided" }
+    }
+
+    val firstSource: LinearAudioSource
+        get() = sources.first()
+}
+
+data class LinearAudioSource(
+    val uri: String,
+    val mimeType: String?,
+)