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e859e668d2
[#15206] [Fix GH-1976] git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@65505 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
1267 lines
44 KiB
Ruby
1267 lines
44 KiB
Ruby
# frozen_string_literal: false
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require_relative "parent"
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require_relative "namespace"
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require_relative "attribute"
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require_relative "cdata"
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require_relative "xpath"
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require_relative "parseexception"
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module REXML
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# An implementation note about namespaces:
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# As we parse, when we find namespaces we put them in a hash and assign
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# them a unique ID. We then convert the namespace prefix for the node
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# to the unique ID. This makes namespace lookup much faster for the
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# cost of extra memory use. We save the namespace prefix for the
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# context node and convert it back when we write it.
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@@namespaces = {}
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# Represents a tagged XML element. Elements are characterized by
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# having children, attributes, and names, and can themselves be
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# children.
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class Element < Parent
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include Namespace
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UNDEFINED = "UNDEFINED"; # The default name
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# Mechanisms for accessing attributes and child elements of this
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# element.
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attr_reader :attributes, :elements
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# The context holds information about the processing environment, such as
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# whitespace handling.
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attr_accessor :context
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# Constructor
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# arg::
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# if not supplied, will be set to the default value.
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# If a String, the name of this object will be set to the argument.
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# If an Element, the object will be shallowly cloned; name,
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# attributes, and namespaces will be copied. Children will +not+ be
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# copied.
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# parent::
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# if supplied, must be a Parent, and will be used as
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# the parent of this object.
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# context::
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# If supplied, must be a hash containing context items. Context items
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# include:
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# * <tt>:respect_whitespace</tt> the value of this is :+all+ or an array of
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# strings being the names of the elements to respect
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# whitespace for. Defaults to :+all+.
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# * <tt>:compress_whitespace</tt> the value can be :+all+ or an array of
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# strings being the names of the elements to ignore whitespace on.
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# Overrides :+respect_whitespace+.
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# * <tt>:ignore_whitespace_nodes</tt> the value can be :+all+ or an array
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# of strings being the names of the elements in which to ignore
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# whitespace-only nodes. If this is set, Text nodes which contain only
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# whitespace will not be added to the document tree.
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# * <tt>:raw</tt> can be :+all+, or an array of strings being the names of
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# the elements to process in raw mode. In raw mode, special
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# characters in text is not converted to or from entities.
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def initialize( arg = UNDEFINED, parent=nil, context=nil )
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super(parent)
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@elements = Elements.new(self)
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@attributes = Attributes.new(self)
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@context = context
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if arg.kind_of? String
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self.name = arg
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elsif arg.kind_of? Element
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self.name = arg.expanded_name
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arg.attributes.each_attribute{ |attribute|
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@attributes << Attribute.new( attribute )
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}
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@context = arg.context
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end
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end
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def inspect
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rv = "<#@expanded_name"
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@attributes.each_attribute do |attr|
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rv << " "
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attr.write( rv, 0 )
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end
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if children.size > 0
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rv << "> ... </>"
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else
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rv << "/>"
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end
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end
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# Creates a shallow copy of self.
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# d = Document.new "<a><b/><b/><c><d/></c></a>"
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# new_a = d.root.clone
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# puts new_a # => "<a/>"
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def clone
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self.class.new self
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end
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# Evaluates to the root node of the document that this element
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# belongs to. If this element doesn't belong to a document, but does
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# belong to another Element, the parent's root will be returned, until the
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# earliest ancestor is found.
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#
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# Note that this is not the same as the document element.
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# In the following example, <a> is the document element, and the root
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# node is the parent node of the document element. You may ask yourself
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# why the root node is useful: consider the doctype and XML declaration,
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# and any processing instructions before the document element... they
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# are children of the root node, or siblings of the document element.
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# The only time this isn't true is when an Element is created that is
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# not part of any Document. In this case, the ancestor that has no
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# parent acts as the root node.
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# d = Document.new '<a><b><c/></b></a>'
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# a = d[1] ; c = a[1][1]
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# d.root_node == d # TRUE
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# a.root_node # namely, d
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# c.root_node # again, d
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def root_node
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parent.nil? ? self : parent.root_node
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end
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def root
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return elements[1] if self.kind_of? Document
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return self if parent.kind_of? Document or parent.nil?
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return parent.root
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end
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# Evaluates to the document to which this element belongs, or nil if this
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# element doesn't belong to a document.
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def document
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rt = root
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rt.parent if rt
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end
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# Evaluates to +true+ if whitespace is respected for this element. This
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# is the case if:
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# 1. Neither :+respect_whitespace+ nor :+compress_whitespace+ has any value
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# 2. The context has :+respect_whitespace+ set to :+all+ or
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# an array containing the name of this element, and
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# :+compress_whitespace+ isn't set to :+all+ or an array containing the
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# name of this element.
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# The evaluation is tested against +expanded_name+, and so is namespace
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# sensitive.
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def whitespace
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@whitespace = nil
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if @context
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if @context[:respect_whitespace]
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@whitespace = (@context[:respect_whitespace] == :all or
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@context[:respect_whitespace].include? expanded_name)
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end
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@whitespace = false if (@context[:compress_whitespace] and
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(@context[:compress_whitespace] == :all or
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@context[:compress_whitespace].include? expanded_name)
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)
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end
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@whitespace = true unless @whitespace == false
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@whitespace
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end
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def ignore_whitespace_nodes
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@ignore_whitespace_nodes = false
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if @context
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if @context[:ignore_whitespace_nodes]
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@ignore_whitespace_nodes =
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(@context[:ignore_whitespace_nodes] == :all or
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@context[:ignore_whitespace_nodes].include? expanded_name)
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end
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end
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end
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# Evaluates to +true+ if raw mode is set for this element. This
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# is the case if the context has :+raw+ set to :+all+ or
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# an array containing the name of this element.
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#
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# The evaluation is tested against +expanded_name+, and so is namespace
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# sensitive.
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def raw
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@raw = (@context and @context[:raw] and
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(@context[:raw] == :all or
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@context[:raw].include? expanded_name))
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@raw
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end
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#once :whitespace, :raw, :ignore_whitespace_nodes
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#################################################
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# Namespaces #
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#################################################
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# Evaluates to an +Array+ containing the prefixes (names) of all defined
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# namespaces at this context node.
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# doc = Document.new("<a xmlns:x='1' xmlns:y='2'><b/><c xmlns:z='3'/></a>")
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# doc.elements['//b'].prefixes # -> ['x', 'y']
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def prefixes
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prefixes = []
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prefixes = parent.prefixes if parent
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prefixes |= attributes.prefixes
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return prefixes
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end
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def namespaces
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namespaces = {}
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namespaces = parent.namespaces if parent
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namespaces = namespaces.merge( attributes.namespaces )
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return namespaces
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end
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# Evaluates to the URI for a prefix, or the empty string if no such
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# namespace is declared for this element. Evaluates recursively for
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# ancestors. Returns the default namespace, if there is one.
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# prefix::
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# the prefix to search for. If not supplied, returns the default
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# namespace if one exists
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# Returns::
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# the namespace URI as a String, or nil if no such namespace
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# exists. If the namespace is undefined, returns an empty string
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# doc = Document.new("<a xmlns='1' xmlns:y='2'><b/><c xmlns:z='3'/></a>")
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# b = doc.elements['//b']
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# b.namespace # -> '1'
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# b.namespace("y") # -> '2'
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def namespace(prefix=nil)
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if prefix.nil?
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prefix = prefix()
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end
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if prefix == ''
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prefix = "xmlns"
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else
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prefix = "xmlns:#{prefix}" unless prefix[0,5] == 'xmlns'
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end
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ns = attributes[ prefix ]
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ns = parent.namespace(prefix) if ns.nil? and parent
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ns = '' if ns.nil? and prefix == 'xmlns'
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return ns
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end
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# Adds a namespace to this element.
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# prefix::
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# the prefix string, or the namespace URI if +uri+ is not
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# supplied
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# uri::
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# the namespace URI. May be nil, in which +prefix+ is used as
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# the URI
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# Evaluates to: this Element
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# a = Element.new("a")
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# a.add_namespace("xmlns:foo", "bar" )
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# a.add_namespace("foo", "bar") # shorthand for previous line
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# a.add_namespace("twiddle")
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# puts a #-> <a xmlns:foo='bar' xmlns='twiddle'/>
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def add_namespace( prefix, uri=nil )
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unless uri
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@attributes["xmlns"] = prefix
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else
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prefix = "xmlns:#{prefix}" unless prefix =~ /^xmlns:/
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@attributes[ prefix ] = uri
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end
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self
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end
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# Removes a namespace from this node. This only works if the namespace is
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# actually declared in this node. If no argument is passed, deletes the
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# default namespace.
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#
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# Evaluates to: this element
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# doc = Document.new "<a xmlns:foo='bar' xmlns='twiddle'/>"
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# doc.root.delete_namespace
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# puts doc # -> <a xmlns:foo='bar'/>
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# doc.root.delete_namespace 'foo'
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# puts doc # -> <a/>
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def delete_namespace namespace="xmlns"
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namespace = "xmlns:#{namespace}" unless namespace == 'xmlns'
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attribute = attributes.get_attribute(namespace)
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attribute.remove unless attribute.nil?
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self
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end
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#################################################
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# Elements #
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#################################################
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# Adds a child to this element, optionally setting attributes in
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# the element.
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# element::
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# optional. If Element, the element is added.
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# Otherwise, a new Element is constructed with the argument (see
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# Element.initialize).
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# attrs::
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# If supplied, must be a Hash containing String name,value
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# pairs, which will be used to set the attributes of the new Element.
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# Returns:: the Element that was added
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# el = doc.add_element 'my-tag'
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# el = doc.add_element 'my-tag', {'attr1'=>'val1', 'attr2'=>'val2'}
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# el = Element.new 'my-tag'
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# doc.add_element el
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def add_element element, attrs=nil
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raise "First argument must be either an element name, or an Element object" if element.nil?
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el = @elements.add(element)
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attrs.each do |key, value|
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el.attributes[key]=value
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end if attrs.kind_of? Hash
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el
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end
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# Deletes a child element.
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# element::
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# Must be an +Element+, +String+, or +Integer+. If Element,
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# the element is removed. If String, the element is found (via XPath)
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# and removed. <em>This means that any parent can remove any
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# descendant.<em> If Integer, the Element indexed by that number will be
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# removed.
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# Returns:: the element that was removed.
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# doc.delete_element "/a/b/c[@id='4']"
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# doc.delete_element doc.elements["//k"]
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# doc.delete_element 1
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def delete_element element
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@elements.delete element
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end
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# Evaluates to +true+ if this element has at least one child Element
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# doc = Document.new "<a><b/><c>Text</c></a>"
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# doc.root.has_elements # -> true
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# doc.elements["/a/b"].has_elements # -> false
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# doc.elements["/a/c"].has_elements # -> false
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def has_elements?
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!@elements.empty?
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end
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# Iterates through the child elements, yielding for each Element that
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# has a particular attribute set.
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# key::
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# the name of the attribute to search for
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# value::
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# the value of the attribute
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# max::
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# (optional) causes this method to return after yielding
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# for this number of matching children
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# name::
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# (optional) if supplied, this is an XPath that filters
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# the children to check.
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#
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# doc = Document.new "<a><b @id='1'/><c @id='2'/><d @id='1'/><e/></a>"
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# # Yields b, c, d
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# doc.root.each_element_with_attribute( 'id' ) {|e| p e}
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# # Yields b, d
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# doc.root.each_element_with_attribute( 'id', '1' ) {|e| p e}
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# # Yields b
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# doc.root.each_element_with_attribute( 'id', '1', 1 ) {|e| p e}
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# # Yields d
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# doc.root.each_element_with_attribute( 'id', '1', 0, 'd' ) {|e| p e}
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def each_element_with_attribute( key, value=nil, max=0, name=nil, &block ) # :yields: Element
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each_with_something( proc {|child|
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if value.nil?
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child.attributes[key] != nil
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else
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child.attributes[key]==value
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end
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}, max, name, &block )
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end
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# Iterates through the children, yielding for each Element that
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# has a particular text set.
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# text::
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# the text to search for. If nil, or not supplied, will iterate
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# over all +Element+ children that contain at least one +Text+ node.
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# max::
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# (optional) causes this method to return after yielding
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# for this number of matching children
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# name::
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# (optional) if supplied, this is an XPath that filters
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# the children to check.
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#
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# doc = Document.new '<a><b>b</b><c>b</c><d>d</d><e/></a>'
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# # Yields b, c, d
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# doc.each_element_with_text {|e|p e}
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# # Yields b, c
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# doc.each_element_with_text('b'){|e|p e}
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# # Yields b
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# doc.each_element_with_text('b', 1){|e|p e}
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# # Yields d
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# doc.each_element_with_text(nil, 0, 'd'){|e|p e}
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def each_element_with_text( text=nil, max=0, name=nil, &block ) # :yields: Element
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each_with_something( proc {|child|
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if text.nil?
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child.has_text?
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else
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child.text == text
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end
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}, max, name, &block )
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end
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# Synonym for Element.elements.each
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def each_element( xpath=nil, &block ) # :yields: Element
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@elements.each( xpath, &block )
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end
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# Synonym for Element.to_a
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# This is a little slower than calling elements.each directly.
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# xpath:: any XPath by which to search for elements in the tree
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# Returns:: an array of Elements that match the supplied path
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def get_elements( xpath )
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@elements.to_a( xpath )
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end
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# Returns the next sibling that is an element, or nil if there is
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# no Element sibling after this one
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# doc = Document.new '<a><b/>text<c/></a>'
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# doc.root.elements['b'].next_element #-> <c/>
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# doc.root.elements['c'].next_element #-> nil
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def next_element
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element = next_sibling
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element = element.next_sibling until element.nil? or element.kind_of? Element
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return element
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end
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# Returns the previous sibling that is an element, or nil if there is
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# no Element sibling prior to this one
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# doc = Document.new '<a><b/>text<c/></a>'
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# doc.root.elements['c'].previous_element #-> <b/>
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# doc.root.elements['b'].previous_element #-> nil
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def previous_element
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element = previous_sibling
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element = element.previous_sibling until element.nil? or element.kind_of? Element
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return element
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end
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#################################################
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# Text #
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#################################################
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# Evaluates to +true+ if this element has at least one Text child
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def has_text?
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not text().nil?
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end
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# A convenience method which returns the String value of the _first_
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# child text element, if one exists, and +nil+ otherwise.
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#
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# <em>Note that an element may have multiple Text elements, perhaps
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# separated by other children</em>. Be aware that this method only returns
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# the first Text node.
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#
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# This method returns the +value+ of the first text child node, which
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# ignores the +raw+ setting, so always returns normalized text. See
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# the Text::value documentation.
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#
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# doc = Document.new "<p>some text <b>this is bold!</b> more text</p>"
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# # The element 'p' has two text elements, "some text " and " more text".
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# doc.root.text #-> "some text "
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def text( path = nil )
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rv = get_text(path)
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return rv.value unless rv.nil?
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nil
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end
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# Returns the first child Text node, if any, or +nil+ otherwise.
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# This method returns the actual +Text+ node, rather than the String content.
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# doc = Document.new "<p>some text <b>this is bold!</b> more text</p>"
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# # The element 'p' has two text elements, "some text " and " more text".
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# doc.root.get_text.value #-> "some text "
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def get_text path = nil
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rv = nil
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if path
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element = @elements[ path ]
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rv = element.get_text unless element.nil?
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else
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rv = @children.find { |node| node.kind_of? Text }
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end
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return rv
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end
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# Sets the first Text child of this object. See text() for a
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# discussion about Text children.
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#
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# If a Text child already exists, the child is replaced by this
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# content. This means that Text content can be deleted by calling
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# this method with a nil argument. In this case, the next Text
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# child becomes the first Text child. In no case is the order of
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# any siblings disturbed.
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# text::
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# If a String, a new Text child is created and added to
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# this Element as the first Text child. If Text, the text is set
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# as the first Child element. If nil, then any existing first Text
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# child is removed.
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# Returns:: this Element.
|
|
# doc = Document.new '<a><b/></a>'
|
|
# doc.root.text = 'Sean' #-> '<a><b/>Sean</a>'
|
|
# doc.root.text = 'Elliott' #-> '<a><b/>Elliott</a>'
|
|
# doc.root.add_element 'c' #-> '<a><b/>Elliott<c/></a>'
|
|
# doc.root.text = 'Russell' #-> '<a><b/>Russell<c/></a>'
|
|
# doc.root.text = nil #-> '<a><b/><c/></a>'
|
|
def text=( text )
|
|
if text.kind_of? String
|
|
text = Text.new( text, whitespace(), nil, raw() )
|
|
elsif !text.nil? and !text.kind_of? Text
|
|
text = Text.new( text.to_s, whitespace(), nil, raw() )
|
|
end
|
|
old_text = get_text
|
|
if text.nil?
|
|
old_text.remove unless old_text.nil?
|
|
else
|
|
if old_text.nil?
|
|
self << text
|
|
else
|
|
old_text.replace_with( text )
|
|
end
|
|
end
|
|
return self
|
|
end
|
|
|
|
# A helper method to add a Text child. Actual Text instances can
|
|
# be added with regular Parent methods, such as add() and <<()
|
|
# text::
|
|
# if a String, a new Text instance is created and added
|
|
# to the parent. If Text, the object is added directly.
|
|
# Returns:: this Element
|
|
# e = Element.new('a') #-> <e/>
|
|
# e.add_text 'foo' #-> <e>foo</e>
|
|
# e.add_text Text.new(' bar') #-> <e>foo bar</e>
|
|
# Note that at the end of this example, the branch has <b>3</b> nodes; the 'e'
|
|
# element and <b>2</b> Text node children.
|
|
def add_text( text )
|
|
if text.kind_of? String
|
|
if @children[-1].kind_of? Text
|
|
@children[-1] << text
|
|
return
|
|
end
|
|
text = Text.new( text, whitespace(), nil, raw() )
|
|
end
|
|
self << text unless text.nil?
|
|
return self
|
|
end
|
|
|
|
def node_type
|
|
:element
|
|
end
|
|
|
|
def xpath
|
|
path_elements = []
|
|
cur = self
|
|
path_elements << __to_xpath_helper( self )
|
|
while cur.parent
|
|
cur = cur.parent
|
|
path_elements << __to_xpath_helper( cur )
|
|
end
|
|
return path_elements.reverse.join( "/" )
|
|
end
|
|
|
|
#################################################
|
|
# Attributes #
|
|
#################################################
|
|
|
|
# Fetches an attribute value or a child.
|
|
#
|
|
# If String or Symbol is specified, it's treated as attribute
|
|
# name. Attribute value as String or +nil+ is returned. This case
|
|
# is shortcut of +attributes[name]+.
|
|
#
|
|
# If Integer is specified, it's treated as the index of
|
|
# child. It returns Nth child.
|
|
#
|
|
# doc = REXML::Document.new("<a attr='1'><b/><c/></a>")
|
|
# doc.root["attr"] # => "1"
|
|
# doc.root.attributes["attr"] # => "1"
|
|
# doc.root[1] # => <c/>
|
|
def [](name_or_index)
|
|
case name_or_index
|
|
when String
|
|
attributes[name_or_index]
|
|
when Symbol
|
|
attributes[name_or_index.to_s]
|
|
else
|
|
super
|
|
end
|
|
end
|
|
|
|
def attribute( name, namespace=nil )
|
|
prefix = nil
|
|
if namespaces.respond_to? :key
|
|
prefix = namespaces.key(namespace) if namespace
|
|
else
|
|
prefix = namespaces.index(namespace) if namespace
|
|
end
|
|
prefix = nil if prefix == 'xmlns'
|
|
|
|
ret_val =
|
|
attributes.get_attribute( "#{prefix ? prefix + ':' : ''}#{name}" )
|
|
|
|
return ret_val unless ret_val.nil?
|
|
return nil if prefix.nil?
|
|
|
|
# now check that prefix'es namespace is not the same as the
|
|
# default namespace
|
|
return nil unless ( namespaces[ prefix ] == namespaces[ 'xmlns' ] )
|
|
|
|
attributes.get_attribute( name )
|
|
|
|
end
|
|
|
|
# Evaluates to +true+ if this element has any attributes set, false
|
|
# otherwise.
|
|
def has_attributes?
|
|
return !@attributes.empty?
|
|
end
|
|
|
|
# Adds an attribute to this element, overwriting any existing attribute
|
|
# by the same name.
|
|
# key::
|
|
# can be either an Attribute or a String. If an Attribute,
|
|
# the attribute is added to the list of Element attributes. If String,
|
|
# the argument is used as the name of the new attribute, and the value
|
|
# parameter must be supplied.
|
|
# value::
|
|
# Required if +key+ is a String, and ignored if the first argument is
|
|
# an Attribute. This is a String, and is used as the value
|
|
# of the new Attribute. This should be the unnormalized value of the
|
|
# attribute (without entities).
|
|
# Returns:: the Attribute added
|
|
# e = Element.new 'e'
|
|
# e.add_attribute( 'a', 'b' ) #-> <e a='b'/>
|
|
# e.add_attribute( 'x:a', 'c' ) #-> <e a='b' x:a='c'/>
|
|
# e.add_attribute Attribute.new('b', 'd') #-> <e a='b' x:a='c' b='d'/>
|
|
def add_attribute( key, value=nil )
|
|
if key.kind_of? Attribute
|
|
@attributes << key
|
|
else
|
|
@attributes[key] = value
|
|
end
|
|
end
|
|
|
|
# Add multiple attributes to this element.
|
|
# hash:: is either a hash, or array of arrays
|
|
# el.add_attributes( {"name1"=>"value1", "name2"=>"value2"} )
|
|
# el.add_attributes( [ ["name1","value1"], ["name2"=>"value2"] ] )
|
|
def add_attributes hash
|
|
if hash.kind_of? Hash
|
|
hash.each_pair {|key, value| @attributes[key] = value }
|
|
elsif hash.kind_of? Array
|
|
hash.each { |value| @attributes[ value[0] ] = value[1] }
|
|
end
|
|
end
|
|
|
|
# Removes an attribute
|
|
# key::
|
|
# either an Attribute or a String. In either case, the
|
|
# attribute is found by matching the attribute name to the argument,
|
|
# and then removed. If no attribute is found, no action is taken.
|
|
# Returns::
|
|
# the attribute removed, or nil if this Element did not contain
|
|
# a matching attribute
|
|
# e = Element.new('E')
|
|
# e.add_attribute( 'name', 'Sean' ) #-> <E name='Sean'/>
|
|
# r = e.add_attribute( 'sur:name', 'Russell' ) #-> <E name='Sean' sur:name='Russell'/>
|
|
# e.delete_attribute( 'name' ) #-> <E sur:name='Russell'/>
|
|
# e.delete_attribute( r ) #-> <E/>
|
|
def delete_attribute(key)
|
|
attr = @attributes.get_attribute(key)
|
|
attr.remove unless attr.nil?
|
|
end
|
|
|
|
#################################################
|
|
# Other Utilities #
|
|
#################################################
|
|
|
|
# Get an array of all CData children.
|
|
# IMMUTABLE
|
|
def cdatas
|
|
find_all { |child| child.kind_of? CData }.freeze
|
|
end
|
|
|
|
# Get an array of all Comment children.
|
|
# IMMUTABLE
|
|
def comments
|
|
find_all { |child| child.kind_of? Comment }.freeze
|
|
end
|
|
|
|
# Get an array of all Instruction children.
|
|
# IMMUTABLE
|
|
def instructions
|
|
find_all { |child| child.kind_of? Instruction }.freeze
|
|
end
|
|
|
|
# Get an array of all Text children.
|
|
# IMMUTABLE
|
|
def texts
|
|
find_all { |child| child.kind_of? Text }.freeze
|
|
end
|
|
|
|
# == DEPRECATED
|
|
# See REXML::Formatters
|
|
#
|
|
# Writes out this element, and recursively, all children.
|
|
# output::
|
|
# output an object which supports '<< string'; this is where the
|
|
# document will be written.
|
|
# indent::
|
|
# An integer. If -1, no indenting will be used; otherwise, the
|
|
# indentation will be this number of spaces, and children will be
|
|
# indented an additional amount. Defaults to -1
|
|
# transitive::
|
|
# If transitive is true and indent is >= 0, then the output will be
|
|
# pretty-printed in such a way that the added whitespace does not affect
|
|
# the parse tree of the document
|
|
# ie_hack::
|
|
# This hack inserts a space before the /> on empty tags to address
|
|
# a limitation of Internet Explorer. Defaults to false
|
|
#
|
|
# out = ''
|
|
# doc.write( out ) #-> doc is written to the string 'out'
|
|
# doc.write( $stdout ) #-> doc written to the console
|
|
def write(output=$stdout, indent=-1, transitive=false, ie_hack=false)
|
|
Kernel.warn("#{self.class.name}.write is deprecated. See REXML::Formatters", uplevel: 1)
|
|
formatter = if indent > -1
|
|
if transitive
|
|
require_relative "formatters/transitive"
|
|
REXML::Formatters::Transitive.new( indent, ie_hack )
|
|
else
|
|
REXML::Formatters::Pretty.new( indent, ie_hack )
|
|
end
|
|
else
|
|
REXML::Formatters::Default.new( ie_hack )
|
|
end
|
|
formatter.write( self, output )
|
|
end
|
|
|
|
|
|
private
|
|
def __to_xpath_helper node
|
|
rv = node.expanded_name.clone
|
|
if node.parent
|
|
results = node.parent.find_all {|n|
|
|
n.kind_of?(REXML::Element) and n.expanded_name == node.expanded_name
|
|
}
|
|
if results.length > 1
|
|
idx = results.index( node )
|
|
rv << "[#{idx+1}]"
|
|
end
|
|
end
|
|
rv
|
|
end
|
|
|
|
# A private helper method
|
|
def each_with_something( test, max=0, name=nil )
|
|
num = 0
|
|
@elements.each( name ){ |child|
|
|
yield child if test.call(child) and num += 1
|
|
return if max>0 and num == max
|
|
}
|
|
end
|
|
end
|
|
|
|
########################################################################
|
|
# ELEMENTS #
|
|
########################################################################
|
|
|
|
# A class which provides filtering of children for Elements, and
|
|
# XPath search support. You are expected to only encounter this class as
|
|
# the <tt>element.elements</tt> object. Therefore, you are
|
|
# _not_ expected to instantiate this yourself.
|
|
class Elements
|
|
include Enumerable
|
|
# Constructor
|
|
# parent:: the parent Element
|
|
def initialize parent
|
|
@element = parent
|
|
end
|
|
|
|
# Fetches a child element. Filters only Element children, regardless of
|
|
# the XPath match.
|
|
# index::
|
|
# the search parameter. This is either an Integer, which
|
|
# will be used to find the index'th child Element, or an XPath,
|
|
# which will be used to search for the Element. <em>Because
|
|
# of the nature of XPath searches, any element in the connected XML
|
|
# document can be fetched through any other element.</em> <b>The
|
|
# Integer index is 1-based, not 0-based.</b> This means that the first
|
|
# child element is at index 1, not 0, and the +n+th element is at index
|
|
# +n+, not <tt>n-1</tt>. This is because XPath indexes element children
|
|
# starting from 1, not 0, and the indexes should be the same.
|
|
# name::
|
|
# optional, and only used in the first argument is an
|
|
# Integer. In that case, the index'th child Element that has the
|
|
# supplied name will be returned. Note again that the indexes start at 1.
|
|
# Returns:: the first matching Element, or nil if no child matched
|
|
# doc = Document.new '<a><b/><c id="1"/><c id="2"/><d/></a>'
|
|
# doc.root.elements[1] #-> <b/>
|
|
# doc.root.elements['c'] #-> <c id="1"/>
|
|
# doc.root.elements[2,'c'] #-> <c id="2"/>
|
|
def []( index, name=nil)
|
|
if index.kind_of? Integer
|
|
raise "index (#{index}) must be >= 1" if index < 1
|
|
name = literalize(name) if name
|
|
num = 0
|
|
@element.find { |child|
|
|
child.kind_of? Element and
|
|
(name.nil? ? true : child.has_name?( name )) and
|
|
(num += 1) == index
|
|
}
|
|
else
|
|
return XPath::first( @element, index )
|
|
#{ |element|
|
|
# return element if element.kind_of? Element
|
|
#}
|
|
#return nil
|
|
end
|
|
end
|
|
|
|
# Sets an element, replacing any previous matching element. If no
|
|
# existing element is found ,the element is added.
|
|
# index:: Used to find a matching element to replace. See []().
|
|
# element::
|
|
# The element to replace the existing element with
|
|
# the previous element
|
|
# Returns:: nil if no previous element was found.
|
|
#
|
|
# doc = Document.new '<a/>'
|
|
# doc.root.elements[10] = Element.new('b') #-> <a><b/></a>
|
|
# doc.root.elements[1] #-> <b/>
|
|
# doc.root.elements[1] = Element.new('c') #-> <a><c/></a>
|
|
# doc.root.elements['c'] = Element.new('d') #-> <a><d/></a>
|
|
def []=( index, element )
|
|
previous = self[index]
|
|
if previous.nil?
|
|
@element.add element
|
|
else
|
|
previous.replace_with element
|
|
end
|
|
return previous
|
|
end
|
|
|
|
# Returns +true+ if there are no +Element+ children, +false+ otherwise
|
|
def empty?
|
|
@element.find{ |child| child.kind_of? Element}.nil?
|
|
end
|
|
|
|
# Returns the index of the supplied child (starting at 1), or -1 if
|
|
# the element is not a child
|
|
# element:: an +Element+ child
|
|
def index element
|
|
rv = 0
|
|
found = @element.find do |child|
|
|
child.kind_of? Element and
|
|
(rv += 1) and
|
|
child == element
|
|
end
|
|
return rv if found == element
|
|
return -1
|
|
end
|
|
|
|
# Deletes a child Element
|
|
# element::
|
|
# Either an Element, which is removed directly; an
|
|
# xpath, where the first matching child is removed; or an Integer,
|
|
# where the n'th Element is removed.
|
|
# Returns:: the removed child
|
|
# doc = Document.new '<a><b/><c/><c id="1"/></a>'
|
|
# b = doc.root.elements[1]
|
|
# doc.root.elements.delete b #-> <a><c/><c id="1"/></a>
|
|
# doc.elements.delete("a/c[@id='1']") #-> <a><c/></a>
|
|
# doc.root.elements.delete 1 #-> <a/>
|
|
def delete element
|
|
if element.kind_of? Element
|
|
@element.delete element
|
|
else
|
|
el = self[element]
|
|
el.remove if el
|
|
end
|
|
end
|
|
|
|
# Removes multiple elements. Filters for Element children, regardless of
|
|
# XPath matching.
|
|
# xpath:: all elements matching this String path are removed.
|
|
# Returns:: an Array of Elements that have been removed
|
|
# doc = Document.new '<a><c/><c/><c/><c/></a>'
|
|
# deleted = doc.elements.delete_all 'a/c' #-> [<c/>, <c/>, <c/>, <c/>]
|
|
def delete_all( xpath )
|
|
rv = []
|
|
XPath::each( @element, xpath) {|element|
|
|
rv << element if element.kind_of? Element
|
|
}
|
|
rv.each do |element|
|
|
@element.delete element
|
|
element.remove
|
|
end
|
|
return rv
|
|
end
|
|
|
|
# Adds an element
|
|
# element::
|
|
# if supplied, is either an Element, String, or
|
|
# Source (see Element.initialize). If not supplied or nil, a
|
|
# new, default Element will be constructed
|
|
# Returns:: the added Element
|
|
# a = Element.new('a')
|
|
# a.elements.add(Element.new('b')) #-> <a><b/></a>
|
|
# a.elements.add('c') #-> <a><b/><c/></a>
|
|
def add element=nil
|
|
if element.nil?
|
|
Element.new("", self, @element.context)
|
|
elsif not element.kind_of?(Element)
|
|
Element.new(element, self, @element.context)
|
|
else
|
|
@element << element
|
|
element.context = @element.context
|
|
element
|
|
end
|
|
end
|
|
|
|
alias :<< :add
|
|
|
|
# Iterates through all of the child Elements, optionally filtering
|
|
# them by a given XPath
|
|
# xpath::
|
|
# optional. If supplied, this is a String XPath, and is used to
|
|
# filter the children, so that only matching children are yielded. Note
|
|
# that XPaths are automatically filtered for Elements, so that
|
|
# non-Element children will not be yielded
|
|
# doc = Document.new '<a><b/><c/><d/>sean<b/><c/><d/></a>'
|
|
# doc.root.elements.each {|e|p e} #-> Yields b, c, d, b, c, d elements
|
|
# doc.root.elements.each('b') {|e|p e} #-> Yields b, b elements
|
|
# doc.root.elements.each('child::node()') {|e|p e}
|
|
# #-> Yields <b/>, <c/>, <d/>, <b/>, <c/>, <d/>
|
|
# XPath.each(doc.root, 'child::node()', &block)
|
|
# #-> Yields <b/>, <c/>, <d/>, sean, <b/>, <c/>, <d/>
|
|
def each( xpath=nil )
|
|
XPath::each( @element, xpath ) {|e| yield e if e.kind_of? Element }
|
|
end
|
|
|
|
def collect( xpath=nil )
|
|
collection = []
|
|
XPath::each( @element, xpath ) {|e|
|
|
collection << yield(e) if e.kind_of?(Element)
|
|
}
|
|
collection
|
|
end
|
|
|
|
def inject( xpath=nil, initial=nil )
|
|
first = true
|
|
XPath::each( @element, xpath ) {|e|
|
|
if (e.kind_of? Element)
|
|
if (first and initial == nil)
|
|
initial = e
|
|
first = false
|
|
else
|
|
initial = yield( initial, e ) if e.kind_of? Element
|
|
end
|
|
end
|
|
}
|
|
initial
|
|
end
|
|
|
|
# Returns the number of +Element+ children of the parent object.
|
|
# doc = Document.new '<a>sean<b/>elliott<b/>russell<b/></a>'
|
|
# doc.root.size #-> 6, 3 element and 3 text nodes
|
|
# doc.root.elements.size #-> 3
|
|
def size
|
|
count = 0
|
|
@element.each {|child| count+=1 if child.kind_of? Element }
|
|
count
|
|
end
|
|
|
|
# Returns an Array of Element children. An XPath may be supplied to
|
|
# filter the children. Only Element children are returned, even if the
|
|
# supplied XPath matches non-Element children.
|
|
# doc = Document.new '<a>sean<b/>elliott<c/></a>'
|
|
# doc.root.elements.to_a #-> [ <b/>, <c/> ]
|
|
# doc.root.elements.to_a("child::node()") #-> [ <b/>, <c/> ]
|
|
# XPath.match(doc.root, "child::node()") #-> [ sean, <b/>, elliott, <c/> ]
|
|
def to_a( xpath=nil )
|
|
rv = XPath.match( @element, xpath )
|
|
return rv.find_all{|e| e.kind_of? Element} if xpath
|
|
rv
|
|
end
|
|
|
|
private
|
|
# Private helper class. Removes quotes from quoted strings
|
|
def literalize name
|
|
name = name[1..-2] if name[0] == ?' or name[0] == ?" #'
|
|
name
|
|
end
|
|
end
|
|
|
|
########################################################################
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# ATTRIBUTES #
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########################################################################
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# A class that defines the set of Attributes of an Element and provides
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# operations for accessing elements in that set.
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class Attributes < Hash
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# Constructor
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# element:: the Element of which this is an Attribute
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def initialize element
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@element = element
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end
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# Fetches an attribute value. If you want to get the Attribute itself,
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# use get_attribute()
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# name:: an XPath attribute name. Namespaces are relevant here.
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# Returns::
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# the String value of the matching attribute, or +nil+ if no
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# matching attribute was found. This is the unnormalized value
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# (with entities expanded).
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#
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# doc = Document.new "<a foo:att='1' bar:att='2' att='<'/>"
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# doc.root.attributes['att'] #-> '<'
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# doc.root.attributes['bar:att'] #-> '2'
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def [](name)
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attr = get_attribute(name)
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return attr.value unless attr.nil?
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return nil
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end
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def to_a
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enum_for(:each_attribute).to_a
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end
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# Returns the number of attributes the owning Element contains.
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# doc = Document "<a x='1' y='2' foo:x='3'/>"
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# doc.root.attributes.length #-> 3
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def length
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c = 0
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each_attribute { c+=1 }
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c
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end
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alias :size :length
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# Iterates over the attributes of an Element. Yields actual Attribute
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# nodes, not String values.
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#
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# doc = Document.new '<a x="1" y="2"/>'
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# doc.root.attributes.each_attribute {|attr|
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# p attr.expanded_name+" => "+attr.value
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# }
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def each_attribute # :yields: attribute
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return to_enum(__method__) unless block_given?
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each_value do |val|
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if val.kind_of? Attribute
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yield val
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else
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val.each_value { |atr| yield atr }
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end
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end
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end
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# Iterates over each attribute of an Element, yielding the expanded name
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# and value as a pair of Strings.
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#
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# doc = Document.new '<a x="1" y="2"/>'
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# doc.root.attributes.each {|name, value| p name+" => "+value }
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def each
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return to_enum(__method__) unless block_given?
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each_attribute do |attr|
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yield [attr.expanded_name, attr.value]
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end
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end
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# Fetches an attribute
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# name::
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# the name by which to search for the attribute. Can be a
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# <tt>prefix:name</tt> namespace name.
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# Returns:: The first matching attribute, or nil if there was none. This
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# value is an Attribute node, not the String value of the attribute.
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# doc = Document.new '<a x:foo="1" foo="2" bar="3"/>'
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# doc.root.attributes.get_attribute("foo").value #-> "2"
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# doc.root.attributes.get_attribute("x:foo").value #-> "1"
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def get_attribute( name )
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attr = fetch( name, nil )
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if attr.nil?
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return nil if name.nil?
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# Look for prefix
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name =~ Namespace::NAMESPLIT
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prefix, n = $1, $2
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if prefix
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attr = fetch( n, nil )
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# check prefix
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if attr == nil
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elsif attr.kind_of? Attribute
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return attr if prefix == attr.prefix
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else
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attr = attr[ prefix ]
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return attr
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end
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end
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element_document = @element.document
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if element_document and element_document.doctype
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expn = @element.expanded_name
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expn = element_document.doctype.name if expn.size == 0
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attr_val = element_document.doctype.attribute_of(expn, name)
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return Attribute.new( name, attr_val ) if attr_val
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end
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return nil
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end
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if attr.kind_of? Hash
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attr = attr[ @element.prefix ]
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end
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return attr
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end
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# Sets an attribute, overwriting any existing attribute value by the
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# same name. Namespace is significant.
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# name:: the name of the attribute
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# value::
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# (optional) If supplied, the value of the attribute. If
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# nil, any existing matching attribute is deleted.
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# Returns::
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# Owning element
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# doc = Document.new "<a x:foo='1' foo='3'/>"
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# doc.root.attributes['y:foo'] = '2'
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# doc.root.attributes['foo'] = '4'
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# doc.root.attributes['x:foo'] = nil
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def []=( name, value )
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if value.nil? # Delete the named attribute
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attr = get_attribute(name)
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delete attr
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return
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end
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unless value.kind_of? Attribute
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if @element.document and @element.document.doctype
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value = Text::normalize( value, @element.document.doctype )
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else
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value = Text::normalize( value, nil )
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end
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value = Attribute.new(name, value)
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end
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value.element = @element
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old_attr = fetch(value.name, nil)
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if old_attr.nil?
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store(value.name, value)
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elsif old_attr.kind_of? Hash
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old_attr[value.prefix] = value
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elsif old_attr.prefix != value.prefix
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# Check for conflicting namespaces
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raise ParseException.new(
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"Namespace conflict in adding attribute \"#{value.name}\": "+
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"Prefix \"#{old_attr.prefix}\" = "+
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"\"#{@element.namespace(old_attr.prefix)}\" and prefix "+
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"\"#{value.prefix}\" = \"#{@element.namespace(value.prefix)}\"") if
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value.prefix != "xmlns" and old_attr.prefix != "xmlns" and
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@element.namespace( old_attr.prefix ) ==
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@element.namespace( value.prefix )
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store value.name, { old_attr.prefix => old_attr,
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value.prefix => value }
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else
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store value.name, value
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end
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return @element
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end
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# Returns an array of Strings containing all of the prefixes declared
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# by this set of # attributes. The array does not include the default
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# namespace declaration, if one exists.
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# doc = Document.new("<a xmlns='foo' xmlns:x='bar' xmlns:y='twee' "+
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# "z='glorp' p:k='gru'/>")
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# prefixes = doc.root.attributes.prefixes #-> ['x', 'y']
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def prefixes
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ns = []
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each_attribute do |attribute|
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ns << attribute.name if attribute.prefix == 'xmlns'
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end
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if @element.document and @element.document.doctype
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expn = @element.expanded_name
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expn = @element.document.doctype.name if expn.size == 0
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@element.document.doctype.attributes_of(expn).each {
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|attribute|
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ns << attribute.name if attribute.prefix == 'xmlns'
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}
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end
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ns
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end
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def namespaces
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namespaces = {}
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each_attribute do |attribute|
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namespaces[attribute.name] = attribute.value if attribute.prefix == 'xmlns' or attribute.name == 'xmlns'
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end
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if @element.document and @element.document.doctype
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expn = @element.expanded_name
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expn = @element.document.doctype.name if expn.size == 0
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@element.document.doctype.attributes_of(expn).each {
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|attribute|
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namespaces[attribute.name] = attribute.value if attribute.prefix == 'xmlns' or attribute.name == 'xmlns'
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}
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end
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namespaces
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end
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# Removes an attribute
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# attribute::
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# either a String, which is the name of the attribute to remove --
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# namespaces are significant here -- or the attribute to remove.
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# Returns:: the owning element
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# doc = Document.new "<a y:foo='0' x:foo='1' foo='3' z:foo='4'/>"
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# doc.root.attributes.delete 'foo' #-> <a y:foo='0' x:foo='1' z:foo='4'/>"
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# doc.root.attributes.delete 'x:foo' #-> <a y:foo='0' z:foo='4'/>"
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# attr = doc.root.attributes.get_attribute('y:foo')
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# doc.root.attributes.delete attr #-> <a z:foo='4'/>"
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def delete( attribute )
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name = nil
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prefix = nil
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if attribute.kind_of? Attribute
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name = attribute.name
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prefix = attribute.prefix
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else
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attribute =~ Namespace::NAMESPLIT
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prefix, name = $1, $2
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prefix = '' unless prefix
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end
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old = fetch(name, nil)
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if old.kind_of? Hash # the supplied attribute is one of many
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old.delete(prefix)
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if old.size == 1
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repl = nil
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old.each_value{|v| repl = v}
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store name, repl
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end
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elsif old.nil?
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return @element
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else # the supplied attribute is a top-level one
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super(name)
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end
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@element
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end
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# Adds an attribute, overriding any existing attribute by the
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# same name. Namespaces are significant.
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# attribute:: An Attribute
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def add( attribute )
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self[attribute.name] = attribute
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end
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alias :<< :add
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# Deletes all attributes matching a name. Namespaces are significant.
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# name::
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# A String; all attributes that match this path will be removed
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# Returns:: an Array of the Attributes that were removed
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def delete_all( name )
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rv = []
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each_attribute { |attribute|
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rv << attribute if attribute.expanded_name == name
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}
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rv.each{ |attr| attr.remove }
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return rv
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end
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# The +get_attribute_ns+ method retrieves a method by its namespace
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# and name. Thus it is possible to reliably identify an attribute
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# even if an XML processor has changed the prefix.
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#
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# Method contributed by Henrik Martensson
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def get_attribute_ns(namespace, name)
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result = nil
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each_attribute() { |attribute|
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if name == attribute.name &&
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namespace == attribute.namespace() &&
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( !namespace.empty? || !attribute.fully_expanded_name.index(':') )
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# foo will match xmlns:foo, but only if foo isn't also an attribute
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result = attribute if !result or !namespace.empty? or
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!attribute.fully_expanded_name.index(':')
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end
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}
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result
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end
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end
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end
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