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