我必须处理$sql = sprintf("INSERT INTO users (created_at, updated_at, first_name, last_name, email, auth_key, enabled, deleted) VALUES ('%s', '%s', '%s', '%s', '%s', '%s', %d, %d)", $data['created_at'], $data['updated_at'], $data['first_name'], $data['last_name'], $data['email'], $data['auth_key'], $data['enabled'], $data['deleted']);
$this->db->query($sql);
,ul
和ol
标记的深层嵌套。我需要提供与浏览器中相同的视图。我想在pdf文件中实现以下示例:
li
我必须使用虾来完成我的任务。但是大虾不支持HTML标签。所以,我想出了一个使用 text = "
<body>
<ol>
<li>One</li>
<li>Two
<ol>
<li>Inner One</li>
<li>inner Two
<ul>
<li>hey
<ol>
<li>hiiiiiiiii</li>
<li>why</li>
<li>hiiiiiiiii</li>
</ol>
</li>
<li>aniket </li>
</li>
</ul>
<li>sup </li>
<li>there </li>
</ol>
<li>hey </li>
<li>Three</li>
</li>
</ol>
<ol>
<li>Introduction</li>
<ol>
<li>Introduction</li>
</ol>
<li>Description</li>
<li>Observation</li>
<li>Results</li>
<li>Summary</li>
</ol>
<ul>
<li>Introduction</li>
<li>Description
<ul>
<li>Observation
<ul>
<li>Results
<ul>
<li>Summary</li>
</ul>
</li>
</ul>
</li>
</ul>
</li>
<li>Overview</li>
</ul>
</body>"
的解决方案:我正在解析,然后用 gsub 删除标签。我已经针对上述内容的一部分编写了以下解决方案,但问题是ul和ol可能会有所不同。
nokogiri
问题
1)我想要实现的是在使用ul和ol标签时如何处理空间 2)当李进入ul或li里面时,如何处理深层嵌套
答案 0 :(得分:4)
我已经提出了一个解决方案,可以处理多个标识,每个级别都有可配置的计算规则:
require 'nokogiri'
ROMANS = %w[i ii iii iv v vi vii viii ix]
RULES = {
ol: {
1 => ->(index) { "#{index + 1}. " },
2 => ->(index) { "#{('a'..'z').to_a[index]}. " },
3 => ->(index) { "#{ROMANS.to_a[index]}. " },
4 => ->(index) { "#{ROMANS.to_a[index].upcase}. " }
},
ul: {
1 => ->(_) { "\u2022 " },
2 => ->(_) { "\u25E6 " },
3 => ->(_) { "* " },
4 => ->(_) { "- " },
}
}
def ol_rule(group, deepness: 1)
group.search('> li').each_with_index do |item, i|
prefix = RULES[:ol][deepness].call(i)
item.prepend_child(prefix)
descend(item, deepness + 1)
end
end
def ul_rule(group, deepness: 1)
group.search('> li').each_with_index do |item, i|
prefix = RULES[:ul][deepness].call(i)
item.prepend_child(prefix)
descend(item, deepness + 1)
end
end
def descend(item, deepness)
item.search('> ol').each do |ol|
ol_rule(ol, deepness: deepness)
end
item.search('> ul').each do |ul|
ul_rule(ul, deepness: deepness)
end
end
doc = Nokogiri::HTML.fragment(text)
doc.search('ol:root').each do |group|
binding.pry
ol_rule(group, deepness: 1)
end
doc.search('ul:root').each do |group|
ul_rule(group, deepness: 1)
end
然后,您可以删除标记或使用doc.inner_text,具体取决于您的环境。
但有两点需要注意:
当前输出:
1. One
2. Two
a. Inner One
b. inner Two
◦ hey
◦ hey
3. hey
4. hey
hey
Three
1. Introduction
a. Introduction
2. Description
3. Observation
4. Results
5. Summary
• Introduction
• Description
◦ Observation
* Results
- Summary
• Overview
答案 1 :(得分:1)
首先,为了处理空间,我在lambda调用中使用了hack。 另外,我使用nokogiri给出的 add_previous_sibling 函数来添加一些东西。最后,当我们处理ul&amp; amp; amp时,Prawn并没有处理空间。 ol标签所以我使用了这个gsub gsub(/ ^([^ \ S \ r \ n] +)/ m){| m | &#34; \ XC2 \ XA0&#34; * m.size} 。您可以从此link
中了解更多信息注意:Nokogiri无法处理无效的HTML,因此始终提供有效的HTML
RULES = {
ol: {
1 => ->(index) { "#{index + 1}. " },
2 => ->(index) { "#{}" },
3 => ->(index) { "#{}" },
4 => ->(index) { "#{}" }
},
ul: {
1 => ->(_) { "\u2022 " },
2 => ->(_) { "" },
3 => ->(_) { "" },
4 => ->(_) { "" },
},
space: {
1 => ->(index) { " " },
2 => ->(index) { " " },
3 => ->(index) { " " },
4 => ->(index) { " " },
}
}
def ol_rule(group, deepness: 1)
group.search('> li').each_with_index do |item, i|
prefix = RULES[:ol][deepness].call(i)
space = RULES[:space][deepness].call(i)
item.add_previous_sibling(space)
item.prepend_child(prefix)
descend(item, deepness + 1)
end
end
def ul_rule(group, deepness: 1)
group.search('> li').each_with_index do |item, i|
space = RULES[:space][deepness].call(i)
prefix = RULES[:ul][deepness].call(i)
item.add_previous_sibling(space)
item.prepend_child(prefix)
descend(item, deepness + 1)
end
end
def descend(item, deepness)
item.search('> ol').each do |ol|
ol_rule(ol, deepness: deepness)
end
item.search('> ul').each do |ul|
ul_rule(ul, deepness: deepness)
end
end
doc = Nokogiri::HTML.parse(text)
doc.search('ol').each do |group|
ol_rule(group, deepness: 1)
end
doc.search('ul').each do |group|
ul_rule(group, deepness: 1)
end
Prawn::Document.generate("hello.pdf") do
#puts doc.inner_text
text doc.at('body').children.to_html.gsub(/^([^\S\r\n]+)/m) { |m| "\xC2\xA0" * m.size }.gsub("<ul>","").gsub("<\/ul>","").gsub("<ol>","").gsub("<\/ol>","").gsub("<li>", "").gsub("</li>","").gsub("\\n","").gsub(/[\n]+/, "\n")
end
答案 2 :(得分:0)
每当您使用ol
,li
或ul
元素时,您必须递归检查ol
,li
和ul
。如果没有它们,则返回(已发现的子结构),如果存在,则在新节点上调用相同的函数并将其返回值添加到当前结构。
您可以在每个节点上执行不同的操作,具体取决于其类型,然后该功能会自动重新打包所有内容。