'use strict'
var element = require('hast-util-is-element')
var siblings = require('./util/siblings')
var whiteSpaceStart = require('./util/white-space-start')
var comment = require('./util/comment')
var closing = require('./closing')
var omission = require('./omission')
module.exports = omission({
html: html,
head: head,
body: body,
colgroup: colgroup,
tbody: tbody
})
// Whether to omit ``.
function html(node) {
var head = siblings.after(node, -1)
return !head || !comment(head)
}
// Whether to omit ``.
function head(node) {
var children = node.children
var seen = []
var index = -1
while (++index < children.length) {
if (element(children[index], ['title', 'base'])) {
if (seen.indexOf(children[index].tagName) > -1) return false
seen.push(children[index].tagName)
}
}
return children.length
}
// Whether to omit ``.
function body(node) {
var head = siblings.after(node, -1, true)
return (
!head ||
(!comment(head) &&
!whiteSpaceStart(head) &&
!element(head, ['meta', 'link', 'script', 'style', 'template']))
)
}
// Whether to omit ``.
// The spec describes some logic for the opening tag, but it’s easier to
// implement in the closing tag, to the same effect, so we handle it there
// instead.
function colgroup(node, index, parent) {
var previous = siblings.before(parent, index)
var head = siblings.after(node, -1, true)
// Previous colgroup was already omitted.
if (
element(previous, 'colgroup') &&
closing(previous, parent.children.indexOf(previous), parent)
) {
return false
}
return head && element(head, 'col')
}
// Whether to omit ``.
function tbody(node, index, parent) {
var previous = siblings.before(parent, index)
var head = siblings.after(node, -1)
// Previous table section was already omitted.
if (
element(previous, ['thead', 'tbody']) &&
closing(previous, parent.children.indexOf(previous), parent)
) {
return false
}
return head && element(head, 'tr')
}