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import unicode
import layout/box
import types/enums
import html/dom
import css/style
import io/buffer
import io/cell
import utils/twtstr
#type
# Frame = object
# node: Node
# maxwidth: int
# maxheight: int
# box: CSSBox
# context: FormatContext
#proc addText(state: var LayoutState, frame: var Frame, text: Text) =
# let maxwidth = frame.maxwidth
# let fromx = state.fromx
# let x = state.x
# if maxwidth == 0: return
# if not (frame.box of CSSInlineBox): return
# var box = CSSInlineBox(frame.box)
# var r: Rune
# var i = 0
# var rowbox: CSSRowBox
# if fromx > x:
# rowbox = CSSRowBox(x: state.fromx, y: state.y)
# let m = maxwidth - fromx + x
# var w = 0
# var lf = false
# while i < text.data.len:
# let pi = i
# fastRuneAt(text.data, i, r)
# let rw = r.width()
# if rw + w > m:
# i = pi
# inc state.y
# lf = true
# break
# else:
# if r.isWhitespace():
# if not state.whitespace:
# state.whitespace = true
# rowbox.runes.add(Rune(' '))
# inc rowbox.width
# w += rw
# else:
# if state.whitespace:
# state.whitespace = false
# rowbox.runes.add(r)
# inc rowbox.width
# w += rw
#
# box.content.add(rowbox)
# if lf:
# state.fromx = 0
# else:
# state.fromx += rowbox.width
#
# if i < text.data.len:
# rowbox = CSSRowBox(x: state.x, y: state.y)
# var w = 0
# while i < text.data.len:
# let pi = i
# fastRuneAt(text.data, i, r)
# let rw = r.width()
# if rw + w > maxwidth:
# i = pi
# w = 0
# box.content.add(rowbox)
# state.fromx += rowbox.width
# inc state.y
# rowbox = CSSRowBox(x: state.x, y: state.y)
# else:
# rowbox.runes.add(r)
# inc rowbox.width
# w += rw
#
# if rowbox.width > 0:
# box.content.add(rowbox)
# state.fromx += rowbox.width
#proc alignBoxes*(buffer: Buffer) =
# #buffer.rootbox = buffer.document.root.genBox(buffer.width, buffer.height)
# buffer.rootbox = CSSBlockBox(x: 0, y: 0, width: buffer.width, height: buffer.height)
# buffer.rootbox.children.add(CSSInlineBox(x: 0, y: 0, width: buffer.width, height: buffer.height))
# var x = 0
# var stack: seq[Frame]
# var state: LayoutState
# stack.add(Frame(node: buffer.document.root, box: buffer.rootbox, maxwidth: 80, context: CONTEXT_BLOCK))
# while stack.len > 0:
# var frame = stack.pop()
# let node = frame.node
#
# case frame.context
# of CONTEXT_BLOCK:
# case node.nodeType
# of TEXT_NODE: #anonymous
# discard
# of ELEMENT_NODE: #new formatting context
# let elem = Element(node)
# case elem.cssvalues[RULE_DISPLAY].display
# of DISPLAY_BLOCK:
# let parent = frame.box
# state.whitespace = false
# frame.box = CSSBlockBox(x: state.x, y: state.y, width: frame.maxwidth)
# parent.children.add(frame.box)
# frame.context = CONTEXT_BLOCK
# of DISPLAY_INLINE:
# let parent = frame.box
# frame.box = CSSInlineBox(x: state.x, y: state.y, width: frame.maxwidth)
# parent.children.add(frame.box)
# frame.context = CONTEXT_INLINE
# of DISPLAY_NONE: continue
# else: discard #TODO
# else: discard
# of CONTEXT_INLINE:
# case node.nodeType
# of TEXT_NODE: #just add to existing inline box no problem
# let text = Text(node)
# state.addText(frame, text)
# of ELEMENT_NODE:
# let elem = Element(node)
# case elem.cssvalues[RULE_DISPLAY].display
# of DISPLAY_NONE: continue
# else:
# #ok this is the difficult part (TODO)
# #NOTE we're assuming the parent isn't inline, if it is we're screwed
# #basically what we have to do is:
# #* create a new anonymous BLOCK box
# #* for every previous INLINE box in parent (BLOCK) box, do:
# #* copy INLINE box into new anonymous BLOCK box
# #* delete INLINE box
# #* create a new BLOCK box (this one)
# #* NOTE after our BLOCK there's a continuation of the last INLINE box
#
# eprint "?????"
# else: discard
#
# var i = node.childNodes.len - 1
# while i >= 0:
# let child = node.childNodes[i]
# stack.add(Frame(node: child, box: frame.box, maxwidth: frame.maxwidth, context: frame.context))
# dec i
type
LayoutState = object
x: int
y: int
fromx: int
whitespace: bool
context: FormatContext
FormatContext = enum
CONTEXT_BLOCK, CONTEXT_INLINE
proc addChild(parent: var CSSBox, box: CSSBox) =
if box == nil:
return
parent.height += box.height
parent.children.add(box)
proc processNode(parent: CSSBox, node: Node): CSSBox =
case node.nodeType
of ELEMENT_NODE:
let elem = Element(node)
var box: CSSBox
case elem.cssvalues[RULE_DISPLAY].display
of DISPLAY_BLOCK:
box = CSSBlockBox(x: parent.x, y: parent.y + parent.height, width: parent.width)
of DISPLAY_INLINE:
#TODO split this into its own thing
#TODO also rethink this bc it isn't very great
#TODO like, it doesn't work
var fromx = parent.x
if parent.children.len > 0 and parent.children[^1] of CSSInlineBox:
let sib = CSSInlineBox(parent.children[^1])
if sib.content.len > 0:
fromx = sib.content[^1].x + sib.content[^1].width
else:
eprint "???"
elif parent of CSSInlineBox:
let sib = CSSInlineBox(parent)
if sib.content.len > 0:
fromx = sib.content[^1].x + sib.content[^1].width
else:
eprint "???"
box = CSSInlineBox(x: parent.x, y: parent.y + parent.height, width: parent.width)
CSSInlineBox(box).content.add(CSSRowBox(x: fromx, y: box.y))
of DISPLAY_NONE:
return nil
else:
return nil
for child in elem.childNodes:
CSSBox(box).addChild(processNode(box, child))
return box
of TEXT_NODE:
let text = Text(node)
#TODO not always anonymous
var ibox = CSSInlineBox(x: parent.x, y: parent.y + parent.height, width: parent.width)
var ws = true #TODO doesn't always start with newline
let str = text.data
if text.data.len == 0:
return
#TODO ok we'll have to rethink this methinks
var fromx = ibox.x
if parent.children.len > 0 and parent.children[^1] of CSSInlineBox:
let sib = CSSInlineBox(parent.children[^1])
if sib.content.len > 0:
fromx = sib.content[^1].x + sib.content[^1].width
else:
eprint "???"
elif parent of CSSInlineBox:
let sib = CSSInlineBox(parent)
if sib.content.len > 0:
fromx = sib.content[^1].x + sib.content[^1].width
else:
eprint "???"
var i = 0
var w = 0
var rowi = 0
var rowbox = CSSRowBox(x: fromx, y: ibox.y + rowi)
var r: Rune
while i < text.data.len:
fastRuneAt(text.data, i, r)
if w + r.width() > ibox.width:
ibox.content.add(rowbox)
inc rowi
rowbox = CSSRowBox(x: ibox.x, y: ibox.y + rowi)
if r.isWhitespace():
if ws:
continue
else:
ws = true
else:
ws = false
rowbox.width += r.width()
rowbox.runes.add(r)
if rowbox.runes.len > 0:
ibox.content.add(rowbox)
inc rowi
ibox.height += rowi
return ibox
else: discard
return nil
proc alignBoxes*(buffer: Buffer) =
buffer.rootbox = CSSBlockBox(x: 0, y: 0, width: buffer.width, height: 0)
for child in buffer.document.root.childNodes:
buffer.rootbox.addChild(processNode(buffer.rootbox, child))
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