import options
import streams
import strutils
import tables
import css/cssparser
import css/selectorparser
import css/stylednode
import html/dom
import utils/twtstr
import chame/tags
#TODO FLAG_NONE should match insensitively for certain properties
func attrSelectorMatches(elem: Element, sel: Selector): bool =
case sel.rel.t
of RELATION_EXISTS: return elem.attrb(sel.attr)
of RELATION_EQUALS:
case sel.rel.flag
of FLAG_NONE: return elem.attr(sel.attr) == sel.value
of FLAG_I: return elem.attr(sel.attr).equalsIgnoreCase(sel.value)
of FLAG_S: return elem.attr(sel.attr) == sel.value
of RELATION_TOKEN:
let val = elem.attr(sel.attr)
case sel.rel.flag
of FLAG_NONE: return sel.value in val.split(AsciiWhitespace)
of FLAG_I:
let val = val.toLowerAscii()
let selval = sel.value.toLowerAscii()
return selval in val.split(AsciiWhitespace)
of FLAG_S: return sel.value in val.split(AsciiWhitespace)
of RELATION_BEGIN_DASH:
let val = elem.attr(sel.attr)
case sel.rel.flag
of FLAG_NONE: return val == sel.value or sel.value.startsWith(val & '-')
of FLAG_I:
return val.equalsIgnoreCase(sel.value) or
sel.value.startsWithIgnoreCase(val & '-')
of FLAG_S: return val == sel.value or sel.value.startsWith(val & '-')
of RELATION_STARTS_WITH:
let val = elem.attr(sel.attr)
case sel.rel.flag
of FLAG_NONE: return val.startsWith(sel.value)
of FLAG_I: return val.startsWithIgnoreCase(sel.value)
of FLAG_S: return val.startsWith(sel.value)
of RELATION_ENDS_WITH:
let val = elem.attr(sel.attr)
case sel.rel.flag
of FLAG_NONE: return val.endsWith(sel.value)
of FLAG_I: return val.endsWithIgnoreCase(sel.value)
of FLAG_S: return val.endsWith(sel.value)
of RELATION_CONTAINS:
let val = elem.attr(sel.attr)
case sel.rel.flag
of FLAG_NONE: return val.contains(sel.value)
of FLAG_I:
let val = val.toLowerAscii()
let selval = sel.value.toLowerAscii()
return val.contains(selval)
of FLAG_S: return val.contains(sel.value)
func selectorsMatch*[T: Element|StyledNode](elem: T, cxsel: ComplexSelector, felem: T = nil): bool
func selectorsMatch*[T: Element|StyledNode](elem: T, slist: SelectorList, felem: T = nil): bool =
for cxsel in slist:
if elem.selectorsMatch(cxsel, 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.len != 0 and not selem.selectorsMatch(sel.pseudo.ofsels, 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.len == 0 or child.selectorsMatch(sel.pseudo.ofsels, felem):
inc i
return false
of PSEUDO_NTH_LAST_CHILD:
if sel.pseudo.ofsels.len == 0 and not selem.selectorsMatch(sel.pseudo.ofsels, 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.len != 0 or child.selectorsMatch(sel.pseudo.ofsels, 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 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 UNKNOWN_TYPE_SELECTOR:
return elem.localName == sel.tagstr
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
func selectorsMatch[T: Element|StyledNode](elem: T, sels: CompoundSelector, felem: T): bool =
for sel in sels:
if not selectorMatches(elem, sel, felem):
return false
return true
func complexSelectorMatches[T: Element|StyledNode](elem: T, cxsel: ComplexSelector, felem: T = nil): bool =
var e = elem
for i in countdown(cxsel.high, 0):
let sels = cxsel[i]
if e == nil:
return false
var match = false
case sels.ct
of NO_COMBINATOR:
match = e.selectorsMatch(sels, felem)
of DESCENDANT_COMBINATOR:
e = e.parentElement
while e != nil:
if e.selectorsMatch(sels, felem):
match = true
break
e = e.parentElement
of CHILD_COMBINATOR:
e = e.parentElement
if e != nil:
match = e.selectorsMatch(sels, felem)
of NEXT_SIBLING_COMBINATOR:
if e.parentElement == nil: return false
var found = false
for child in e.parentElement.elementList_rev:
when elem is StyledNode:
if not child.isDomElement: continue
if e == child:
found = true
continue
if found:
e = child
match = e.selectorsMatch(sels, felem)
break
of SUBSEQ_SIBLING_COMBINATOR:
var found = false
if e.parentElement == nil: return false
for child in e.parentElement.elementList_rev:
when elem is StyledNode:
if not child.isDomElement: continue
if child == elem:
found = true
continue
if not found: continue
if child.selectorsMatch(sels, felem):
e = child
match = true
break
if not match:
return false
return true
# 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, cxsel: ComplexSelector, felem: T = nil): bool =
var felem = if felem != nil:
felem
else:
elem
return elem.complexSelectorMatches(cxsel, felem)
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))