155 lines
3.3 KiB
Ruby
155 lines
3.3 KiB
Ruby
require 'html5/constants'
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module HTML5
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module TreeWalkers
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module TokenConstructor
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def error(msg)
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{:type => "SerializeError", :data => msg}
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end
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def normalize_attrs(attrs)
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attrs.to_a
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end
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def empty_tag(name, attrs, has_children=false)
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error(_("Void element has children")) if has_children
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{:type => :EmptyTag, :name => name, :data => normalize_attrs(attrs)}
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end
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def start_tag(name, attrs)
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{:type => :StartTag, :name => name, :data => normalize_attrs(attrs)}
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end
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def end_tag(name)
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{:type => :EndTag, :name => name, :data => []}
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end
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def text(data)
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if data =~ /\A([#{SPACE_CHARACTERS.join('')}]+)/m
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yield({:type => :SpaceCharacters, :data => $1})
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data = data[$1.length .. -1]
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return if data.empty?
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end
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if data =~ /([#{SPACE_CHARACTERS.join('')}]+)\Z/m
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yield({:type => :Characters, :data => data[0 ... -$1.length]})
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yield({:type => :SpaceCharacters, :data => $1})
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else
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yield({:type => :Characters, :data => data})
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end
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end
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def comment(data)
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{:type => :Comment, :data => data}
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end
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def doctype(name, public_id, system_id, correct=nil)
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{:type => :Doctype, :name => name, :public_id => public_id, :system_id => system_id, :correct => correct}
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end
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def unknown(nodeType)
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error(_("Unknown node type: ") + nodeType.to_s)
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end
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def _(str)
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str
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end
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end
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class Base
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include TokenConstructor
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def initialize(tree)
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@tree = tree
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end
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def each
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raise NotImplementedError
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end
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alias walk each
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end
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class NonRecursiveTreeWalker < TreeWalkers::Base
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def node_details(node)
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raise NotImplementedError
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end
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def first_child(node)
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raise NotImplementedError
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end
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def next_sibling(node)
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raise NotImplementedError
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end
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def parent(node)
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raise NotImplementedError
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end
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def each
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current_node = @tree
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while current_node != nil
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details = node_details(current_node)
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has_children = false
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case details.shift
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when :DOCTYPE
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yield doctype(*details)
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when :TEXT
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text(*details) {|token| yield token}
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when :ELEMENT
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name, attributes, has_children = details
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if VOID_ELEMENTS.include?(name)
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yield empty_tag(name, attributes.to_a, has_children)
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has_children = false
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else
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yield start_tag(name, attributes.to_a)
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end
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when :COMMENT
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yield comment(details[0])
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when :DOCUMENT, :DOCUMENT_FRAGMENT
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has_children = true
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when nil
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# ignore (REXML::XMLDecl is an example)
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else
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yield unknown(details[0])
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end
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first_child = has_children ? first_child(current_node) : nil
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if first_child != nil
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current_node = first_child
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else
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while current_node != nil
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details = node_details(current_node)
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if details.shift == :ELEMENT
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name, attributes, has_children = details
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yield end_tag(name) if !VOID_ELEMENTS.include?(name)
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end
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if @tree == current_node
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current_node = nil
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else
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next_sibling = next_sibling(current_node)
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if next_sibling != nil
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current_node = next_sibling
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break
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end
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current_node = parent(current_node)
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end
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end
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end
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end
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end
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end
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end
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end
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