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import algorithm
import streams
import sugar
import css/mediaquery
import css/cssparser
import css/select
import css/selectorparser
import css/sheet
import css/values
import html/dom
type
ApplyResult = object
normal: seq[CSSDeclaration]
important: seq[CSSDeclaration]
DeclarationList* = array[PseudoElem, seq[CSSDeclaration]]
proc applyProperty(elem: Element, d: CSSDeclaration, pseudo: PseudoElem) =
var parent: CSSSpecifiedValues
if elem.parentElement != nil:
parent = elem.parentElement.css
else:
parent = rootProperties()
if pseudo == PSEUDO_NONE:
elem.css.applyValue(parent, d)
else:
if elem.pseudo[pseudo] == nil:
elem.pseudo[pseudo] = elem.css.inheritProperties()
elem.pseudo[pseudo].applyValue(elem.css, d)
elem.cssapplied = true
func applies(mq: MediaQuery): bool =
case mq.t
of CONDITION_MEDIA:
case mq.media
of MEDIA_TYPE_ALL: return true
of MEDIA_TYPE_PRINT: return false
of MEDIA_TYPE_SCREEN: return true
of MEDIA_TYPE_SPEECH: return false
of MEDIA_TYPE_TTY: return true
of MEDIA_TYPE_UNKNOWN: return false
of CONDITION_NOT:
return not mq.n.applies()
of CONDITION_AND:
return mq.anda.applies() and mq.andb.applies()
of CONDITION_OR:
return mq.ora.applies() or mq.orb.applies()
of CONDITION_FEATURE:
case mq.feature.t
of FEATURE_COLOR:
return true #TODO
of FEATURE_GRID:
return mq.feature.b
of FEATURE_HOVER:
return mq.feature.b
of FEATURE_PREFERS_COLOR_SCHEME:
return mq.feature.b
func applies(mqlist: MediaQueryList): bool =
for mq in mqlist:
if mq.applies():
return true
return false
type ToSorts = array[PseudoElem, seq[(int, seq[CSSDeclaration])]]
proc calcRule(tosorts: var ToSorts, elem: Element, rule: CSSRuleDef) =
for sel in rule.sels:
if elem.selectorsMatch(sel):
let spec = getSpecificity(sel)
tosorts[sel.pseudo].add((spec,rule.decls))
func calcRules(elem: Element, sheet: CSSStylesheet): DeclarationList =
var tosorts: ToSorts
for rule in sheet.gen_rules(elem.tagType, elem.id, elem.classList):
tosorts.calcRule(elem, rule)
for i in PseudoElem:
tosorts[i].sort((x, y) => cmp(x[0], y[0]))
result[i] = collect(newSeq):
for item in tosorts[i]:
for dl in item[1]:
dl
#TODO couldn't these two procedures be merged?
proc applyNormal(ares: var ApplyResult, decls: seq[CSSDeclaration]) =
for decl in decls:
if not decl.important:
ares.normal.add(decl)
proc applyImportant(ares: var ApplyResult, decls: seq[CSSDeclaration]) =
for decl in decls:
if decl.important:
ares.important.add(decl)
proc checkRendered(element: Element, prev: CSSSpecifiedValues, ppseudo: array[PSEUDO_BEFORE..PSEUDO_AFTER, CSSSpecifiedValues]) =
if element.rendered:
for p in PSEUDO_BEFORE..PSEUDO_AFTER:
if ppseudo[p] != element.pseudo[p] and ppseudo[p] == nil:
if element.parentElement != nil:
element.parentElement.rendered = false
element.rendered = false
return
for t in CSSPropertyType:
if not element.css[t].equals(prev[t]):
if element.parentElement != nil:
element.parentElement.rendered = false
element.rendered = false
return
for p in PSEUDO_BEFORE..PSEUDO_AFTER:
if ppseudo[p] != nil:
for t in CSSPropertyType:
if not element.pseudo[p][t].equals(ppseudo[p][t]):
element.rendered = false
return
proc applyDeclarations(element: Element, ua, user: DeclarationList, author: seq[DeclarationList], pseudo: PseudoElem) =
var ares: ApplyResult
ares.applyNormal(ua[pseudo])
ares.applyNormal(user[pseudo])
for rule in author:
ares.applyNormal(rule[pseudo])
for rule in author:
ares.applyImportant(rule[pseudo])
if pseudo == PSEUDO_NONE:
let style = element.attr("style")
if style.len > 0:
let inline_rules = newStringStream(style).parseListOfDeclarations2()
ares.applyNormal(inline_rules)
ares.applyImportant(inline_rules)
ares.applyImportant(user[pseudo])
ares.applyImportant(ua[pseudo])
for rule in ares.normal:
element.applyProperty(rule, pseudo)
for rule in ares.important:
element.applyProperty(rule, pseudo)
func applyMediaQuery(ss: CSSStylesheet): CSSStylesheet =
result = ss
for mq in ss.mq_list:
if mq.query.applies():
result.add(mq.children.applyMediaQuery())
proc resetRules(elem: Element) =
elem.css = if elem.parentElement != nil:
elem.parentElement.css.inheritProperties()
else:
rootProperties()
for pseudo in PSEUDO_BEFORE..PSEUDO_AFTER:
elem.pseudo[pseudo] = nil
proc applyRules(elem: Element, ua, user: CSSStylesheet, author: seq[CSSStylesheet]) {.inline.} =
let uadecls = calcRules(elem, ua)
let userdecls = calcRules(elem, user)
var authordecls: seq[DeclarationList]
for rule in author:
authordecls.add(calcRules(elem, rule))
for pseudo in PseudoElem:
elem.applyDeclarations(uadecls, userdecls, authordecls, pseudo)
proc applyRules(document: Document, ua, user: CSSStylesheet) =
var author: seq[CSSStylesheet]
for sheet in document.head.sheets:
author.add(sheet)
var stack: seq[Element]
stack.add(document.root)
var lenstack = newSeqOfCap[int](15)
while stack.len > 0:
let elem = stack.pop()
# Remove stylesheets on nil
if elem == nil:
let len = lenstack.pop()
author.setLen(author.len - len)
continue
if not elem.cssapplied:
let prev = elem.css
let ppseudo = elem.pseudo
elem.resetRules()
elem.applyRules(ua, user, author)
elem.checkRendered(prev, ppseudo)
# Add nil before the last element (in-stack), so we can remove the
# stylesheets
if elem.sheets.len > 0:
author.add(elem.sheets)
lenstack.add(elem.sheets.len)
stack.add(nil)
for i in countdown(elem.children.high, 0):
stack.add(elem.children[i])
proc applyStylesheets*(document: Document, uass, userss: CSSStylesheet) =
let uass = uass.applyMediaQuery()
let userss = userss.applyMediaQuery()
document.applyRules(uass, userss)
proc refreshStyle*(elem: Element) =
elem.cssapplied = false
for child in elem.children:
child.refreshStyle()
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