//整理html文档，将block-level/inline-level混合的节点改成只有block-level的节点
//对已只有inline-level的节点，删除行前后的空白符
//将包含inline-level的节点展开成更为简单的形式，去掉想<font><span><strong>等等格式节点
func (this *html_cleaner) clean_block_node(n *html.Node) {
blks := node_has_block_children(n)
inlines := node_has_inline_children(n)
// has bocks and inlines
if blks && inlines {
child := n.FirstChild
for child != nil {
if node_is_inline(child) {
p := child.PrevSibling
if p == nil || p.Data != "p" {
p = create_element("p")
n.InsertBefore(p, child)
}
n.RemoveChild(child)
p.AppendChild(child)
child = p.NextSibling
} else {
child = child.NextSibling
}
}
inlines = false
}
// only inlines
if blks == false && inlines {
this.clean_inline_node(n)
this.trim_empty_spaces(n)
}
// only blocks
if blks && !inlines {
for child := n.FirstChild; child != nil; child = child.NextSibling {
this.clean_block_node(child)
}
}
}