class ReVIEW::EPUBMaker::ReVIEWHeaderListener
Listener class to scan HTML and get heading information
The heading information this listener will retrieve is as follows:
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level: Heading level (1..6)
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id: HTMl ID attribute. Basically the ‘id` attribute of the h(1-6) element, but if there is an `a` element within the h(1-6) element, it will be its `id` attribute.
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title: The title string of the headline. Usually, it is the text within the h(1-6) element, but if there is an ‘img` element, it will be the text with its `alt` attribute.
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notoc: The ‘notoc` attribute of the headline element.
Public Class Methods
new(headlines)
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# File lib/review/epubmaker/reviewheaderlistener.rb, line 21 def initialize(headlines) @level = nil @content = '' @headlines = headlines end
Public Instance Methods
tag_end(name)
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# File lib/review/epubmaker/reviewheaderlistener.rb, line 43 def tag_end(name) if /\Ah\d+/.match?(name) if @id.present? @headlines.push({ 'level' => @level, 'id' => @id, 'title' => @content, 'notoc' => @notoc }) end @content = '' @level = nil @id = nil @notoc = nil end true end
tag_start(name, attrs)
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# File lib/review/epubmaker/reviewheaderlistener.rb, line 27 def tag_start(name, attrs) if name =~ /\Ah(\d+)/ raise "#{name}, #{attrs}" if @level.present? @level = $1.to_i @id = attrs['id'] if attrs['id'].present? @notoc = attrs['notoc'] if attrs['notoc'].present? elsif @level.present? # if in <hN> tag if name == 'img' && attrs['alt'].present? @content << attrs['alt'] elsif name == 'a' && attrs['id'].present? @id = attrs['id'] end end end
text(text)
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# File lib/review/epubmaker/reviewheaderlistener.rb, line 60 def text(text) if @level.present? @content << text.tr("\t", ' ') end end