import options
import streams
import strutils
import tables
import css/cssparser
import css/selectorparser
import css/stylednode
import html/dom
import html/tags
func attrSelectorMatches(elem: Element, sel: Selector): bool =
case sel.rel
of ' ': return elem.attrb(sel.attr)
of '=': return elem.attr(sel.attr) == sel.value
of '~': return sel.value in elem.attr(sel.attr).split(Whitespace)
of '|':
let val = elem.attr(sel.attr)
return val == sel.value or sel.value.startsWith(val & '-')
of '^': return elem.attr(sel.attr).startsWith(sel.value)
of '$': return elem.attr(sel.attr).endsWith(sel.value)
of '*': return elem.attr(sel.attr).contains(sel.value)
else: return false
func selectorsMatch*[T: Element|StyledNode](elem: T, selectors: ComplexSelector, felem: T = nil): bool
func selectorsMatch*[T: Element|StyledNode](elem: T, selectors: SelectorList, felem: T = nil): bool =
for slist in selectors:
if elem.selectorsMatch(slist, felem):
return true
return false
func pseudoSelectorMatches[T: Element|StyledNode](elem: T, sel: Selector, felem: T): bool =
let selem = elem
when elem is StyledNode:
let elem = Element(elem.node)
case sel.pseudo.t
of PSEUDO_FIRST_CHILD: return elem.parentNode.firstElementChild == elem
of PSEUDO_LAST_CHILD: return elem.parentNode.lastElementChild == elem
of PSEUDO_ONLY_CHILD: return elem.parentNode.firstElementChild == elem and elem.parentNode.lastElementChild == elem
of PSEUDO_HOVER:
when selem is StyledNode: felem.addDependency(selem, DEPEND_HOVER)
return elem.hover
of PSEUDO_ROOT: return elem == elem.document.html
of PSEUDO_NTH_CHILD:
if sel.pseudo.ofsels.issome and not selem.selectorsMatch(sel.pseudo.ofsels.get, felem):
return false
let A = sel.pseudo.anb.A # step
let B = sel.pseudo.anb.B # start
var i = 1
let parent = when selem is StyledNode: selem.parent
else: selem.parentNode
if parent == nil: return false
for child in parent.elementList:
when selem is StyledNode:
if not child.isDomElement: continue
if child == selem:
if A == 0:
return i == B
if A < 0:
return (i - B) <= 0 and (i - B) mod A == 0
return (i - B) >= 0 and (i - B) mod A == 0
if sel.pseudo.ofsels.isnone or child.selectorsMatch(sel.pseudo.ofsels.get, felem):
inc i
return false
of PSEUDO_NTH_LAST_CHILD:
if sel.pseudo.ofsels.issome and not selem.selectorsMatch(sel.pseudo.ofsels.get, felem):
return false
let A = sel.pseudo.anb.A # step
let B = sel.pseudo.anb.B # start
var i = 1
let parent = when selem is StyledNode: selem.parent
else: selem.parentNode
if parent == nil: return false
for child in parent.elementList_rev:
when selem is StyledNode:
if not child.isDomElement: continue
if child == selem:
if A == 0:
return i == B
if A < 0:
return (i - B) <= 0 and (i - B) mod A == 0
return (i - B) >= 0 and (i - B) mod A == 0
if sel.pseudo.ofsels.isnone or child.selectorsMatch(sel.pseudo.ofsels.get, felem):
inc i
return false
of PSEUDO_CHECKED:
when selem is StyledNode: felem.addDependency(selem, DEPEND_CHECKED)
if elem.tagType == TAG_INPUT:
return HTMLInputElement(elem).checked
elif elem.tagType == TAG_OPTION:
return HTMLOptionElement(elem).selected
return false
of PSEUDO_FOCUS:
when selem is StyledNode: felem.addDependency(selem, DEPEND_FOCUS)
return elem.document.focus == elem
of PSEUDO_NOT:
return not selem.selectorsMatch(sel.pseudo.fsels, felem)
of PSEUDO_IS, PSEUDO_WHERE:
return selem.selectorsMatch(sel.pseudo.fsels, felem)
of PSEUDO_LANG:
return sel.pseudo.s == "en" #TODO languages?
of PSEUDO_LINK:
return elem.tagType in {TAG_A, TAG_AREA} and elem.attrb("href")
of PSEUDO_VISITED:
return false
func combinatorSelectorMatches[T: Element|StyledNode](elem: T, sel: Selector, felem: T): bool =
let selem = elem
# combinator without at least two members makes no sense
# actually, combinators with more than two elements are a pretty bad idea
# too. TODO getting rid of them would simplify this function greatly
assert sel.csels.len > 1
if selem.selectorsMatch(sel.csels[^1], felem):
var i = sel.csels.len - 2
case sel.ct
of DESCENDANT_COMBINATOR:
when selem is StyledNode:
var e = elem.parent
else:
var e = elem.parentElement
while e != nil and i >= 0:
if e.selectorsMatch(sel.csels[i], felem):
dec i
when elem is StyledNode:
e = e.parent
else:
e = e.parentElement
of CHILD_COMBINATOR:
when elem is StyledNode:
var e = elem.parent
else:
var e = elem.parentElement
while e != nil and i >= 0:
if not e.selectorsMatch(sel.csels[i], felem):
return false
dec i
when elem is StyledNode:
e = e.parent
else:
e = e.parentElement
of NEXT_SIBLING_COMBINATOR:
var found = false
let parent = when elem is StyledNode: elem.parent
else: elem.parentElement
if parent == nil: return false
for child in parent.elementList_rev:
when elem is StyledNode:
if not child.isDomElement: continue
if found:
if not child.selectorsMatch(sel.csels[i], felem):
return false
dec i
if i < 0:
return true
if child == elem:
found = true
of SUBSEQ_SIBLING_COMBINATOR:
var found = false
let parent = when selem is StyledNode: selem.parent
else: elem.parentElement
if parent == nil: return false
for child in parent.elementList_rev:
when selem is StyledNode:
if not child.isDomElement: continue
if child == selem:
found = true
continue
if not found: continue
if child.selectorsMatch(sel.csels[i], felem):
dec i
if i < 0:
return true
return i == -1
return false
func selectorMatches[T: Element|StyledNode](elem: T, sel: Selector, felem: T = nil): bool =
let selem = elem
when elem is StyledNode:
let elem = Element(selem.node)
case sel.t
of TYPE_SELECTOR:
return elem.tagType == sel.tag
of CLASS_SELECTOR:
return sel.class in elem.classList
of ID_SELECTOR:
return sel.id == elem.id
of ATTR_SELECTOR:
return elem.attrSelectorMatches(sel)
of PSEUDO_SELECTOR:
return pseudoSelectorMatches(selem, sel, felem)
of PSELEM_SELECTOR:
return true
of UNIVERSAL_SELECTOR:
return true
of COMBINATOR_SELECTOR:
return combinatorSelectorMatches(selem, sel, felem)
# WARNING for StyledNode, this has the side effect of modifying depends.
#TODO make that an explicit flag or something, also get rid of the Element case
func selectorsMatch*[T: Element|StyledNode](elem: T, selectors: ComplexSelector, felem: T = nil): bool =
let felem = if felem != nil:
felem
else:
elem
for sel in selectors:
if not selectorMatches(elem, sel, felem):
return false
return true
proc querySelectorAll(node: Node, q: string): seq[Element] =
let selectors = parseSelectors(newStringStream(q))
for element in node.elements:
if element.selectorsMatch(selectors):
result.add(element)
doqsa = (proc(node: Node, q: string): seq[Element] = querySelectorAll(node, q))
proc querySelector(node: Node, q: string): Element =
let selectors = parseSelectors(newStringStream(q))
for element in node.elements:
if element.selectorsMatch(selectors):
return element
return nil
doqs = (proc(node: Node, q: string): Element = querySelector(node, q))