1 files changed, 82 insertions, 0 deletions
diff --git a/src/html/renderer.nim b/src/html/renderer.nim
new file mode 100644
index 00000000..6b63cf29
--- /dev/null
+++ b/src/html/renderer.nim
@@ -0,0 +1,82 @@
+import unicode
+
+import types/enums
+import html/dom
+import css/box
+import css/style
+import io/buffer
+import utils/twtstr
+
+func boxesForText*(text: seq[Rune], width: int, height: int, lx: int, x: int, y: int): seq[CSSInlineBox] =
+  result.add(CSSInlineBox())
+  var w = x
+  var sx = x
+  var sy = y
+  var i = 0
+  while i < text.len and sy < height:
+    let cw = text[i].width()
+    if w + cw > width:
+      result[^1].innerEdge.x2 = sx + w
+      result[^1].innerEdge.y2 = sy + 1
+      sx = lx
+      inc sy
+      w = 0
+
+      result[^2].nextpart = result[^1]
+      result.add(CSSInlineBox())
+      result[^1].innerEdge.x1 = sx
+      result[^1].innerEdge.y1 = sy
+
+    result[^1].content &= text[i]
+    w += cw
+    inc i
+
+    result[^1].innerEdge.y1 = sy
+  if result.len > 1:
+    result[^2].nextpart = result[^1]
+  if w > 0:
+    result[^1].innerEdge.x1 = sx
+    result[^1].innerEdge.y1 = sy
+    result[^1].innerEdge.x2 = sx + w
+    result[^1].innerEdge.y2 = sy + 1
+
+proc generateBox(elem: Element, x: int, y: int, w: int, h: int, fromx: int = x): CSSBox =
+  let display = elem.cssvalues.getValue(RULE_DISPLAY)
+  if display.t == RULE_DISPLAY:
+    if display.display == DISPLAY_NONE:
+      return nil
+  new(result)
+  result.innerEdge.x1 = x
+  result.innerEdge.y1 = y
+
+  var anonBoxes = false
+  for child in elem.children:
+    let rule = child.cssvalues.getValue(RULE_DISPLAY)
+    if rule.t == RULE_DISPLAY and rule.display == DISPLAY_BLOCK:
+      anonBoxes = true
+      break
+  var lx = fromx
+  var rx = x
+  var ry = y
+  for child in elem.childNodes:
+    if child.nodeType == ELEMENT_NODE:
+      let elem = Element(child)
+      let nbox = elem.generateBox(rx, ry, w, h)
+      if nbox != nil:
+        result.innerEdge.x2 = min(max(nbox.size().w, result.innerEdge.x2), w)
+        result.innerEdge.y2 = min(result.innerEdge.y2 + nbox.size().h, w)
+        rx = x
+        ry += nbox.size().h
+        result.children.add(nbox)
+    elif child.nodeType == TEXT_NODE:
+      let text = Text(child)
+      let runes = text.data.toRunes()
+      let boxes = boxesForText(runes, w, h, lx, rx, ry)
+      for child in boxes:
+        result.children.add(child)
+        result.innerEdge.y2 += child.size().h
+        ry += child.size().h
+      lx = boxes[^1].innerEdge.x2
+
+proc alignBoxes*(buffer: Buffer) =
+  buffer.rootbox = buffer.document.root.generateBox(0, 0, buffer.width, buffer.height)