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#--
# Copyright (c) 2005 Robert Aman
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
#++
require 'feed_tools'
require 'feed_tools/helpers/generic_helper'
require 'rexml/document'
module FeedTools
# Generic xml methods needed in numerous places throughout FeedTools
module XmlHelper
# Selects the first non-blank result.
def self.select_not_blank(results, &block)
if results.kind_of? Array
for result in results
blank_result = false
if !block.nil?
blank_result = block.call(result)
else
blank_result = result.to_s.blank?
end
unless result.nil? || blank_result
return result
end
end
else
blank_result = false
if !block.nil?
blank_result = block.call(results)
else
blank_result = results.to_s.blank?
end
unless results.nil? || blank_result
return results
end
end
return nil
end
# Runs through a list of XPath queries on an element or document and
# returns the first non-blank result. Subsequent XPath queries will
# not be evaluated.
def self.try_xpaths(element, xpath_list,
options={}, &block)
FeedTools::GenericHelper.validate_options([ :select_result_value ],
options.keys)
options = { :select_result_value => false }.merge(options)
result = nil
if element.nil?
return nil
end
for xpath in xpath_list
# Namespace aware
result = REXML::XPath.liberal_first(element, xpath,
FEED_TOOLS_NAMESPACES)
if options[:select_result_value] && !result.nil?
if result.respond_to?(:value)
result = result.value
else
result = result.to_s
end
end
blank_result = false
if block_given?
blank_result = yield(result)
else
blank_result = result.to_s.blank?
end
if !blank_result
if result.respond_to? :strip
result.strip!
end
return result
end
# Namespace unaware
result = REXML::XPath.liberal_first(element, xpath)
if options[:select_result_value] && !result.nil?
if result.respond_to?(:value)
result = result.value
else
result = result.to_s
end
end
blank_result = false
if block_given?
blank_result = yield(result)
else
blank_result = result.to_s.blank?
end
if !blank_result
if result.respond_to? :strip
result.strip!
end
return result
end
end
return nil
end
# Runs through a list of XPath queries on an element or document and
# returns all non-empty results. Subsequent XPath queries will
# not be evaluated.
def self.try_xpaths_all(element, xpath_list, options={})
FeedTools::GenericHelper.validate_options([ :select_result_value ],
options.keys)
options = { :select_result_value => false }.merge(options)
results = []
if element.nil?
return []
end
for xpath in xpath_list
# Namespace aware
results = REXML::XPath.liberal_match(element, xpath,
FEED_TOOLS_NAMESPACES)
if options[:select_result_value] && !results.nil? && !results.empty?
results =
results.map { |x| x.respond_to?(:value) ? x.value : x.to_s }
end
if results.blank?
results = REXML::XPath.liberal_match(element, xpath)
else
return results
end
# Namespace unaware
if options[:select_result_value] && !results.nil? && !results.empty?
results =
results.map { |x| x.respond_to?(:value) ? x.value : x.to_s }
end
if !results.blank?
return results
end
end
for xpath in xpath_list
if xpath =~ /^\w+$/
results = []
for child in element.children
if child.class == REXML::Element
if child.name.downcase == xpath.downcase
results << child
end
end
end
if options[:select_result_value] && !results.nil? && !results.empty?
results =
results.map { |x| x.inner_xml }
end
if !results.blank?
return results
end
end
end
return []
end
# Runs through a list of XPath queries on an element or document and
# returns all non-empty results, appending the results from each query
# onto the end of the results from the previous queries.
def self.combine_xpaths_all(element, xpath_list, options={})
FeedTools::GenericHelper.validate_options([ :select_result_value ],
options.keys)
options = { :select_result_value => false }.merge(options)
all_results = []
result = []
if element.nil?
return []
end
for xpath in xpath_list
# Namespace aware
results = REXML::XPath.liberal_match(element, xpath,
FEED_TOOLS_NAMESPACES)
if options[:select_result_value] && !results.nil? && !results.empty?
results =
results.map { |x| x.respond_to?(:value) ? x.value : x.to_s }
end
if results.blank?
results = REXML::XPath.liberal_match(element, xpath)
else
all_results.concat(results)
next
end
# Namespace unaware
if options[:select_result_value] && !results.nil? && !results.empty?
results =
results.map { |x| x.respond_to?(:value) ? x.value : x.to_s }
end
if !results.blank?
all_results.concat(results)
next
end
end
for xpath in xpath_list
if xpath =~ /^\w+$/
results = []
for child in element.children
if child.class == REXML::Element
if child.name.downcase == xpath.downcase
results << child
end
end
end
if options[:select_result_value] && !results.nil? && !results.empty?
results =
results.map { |x| x.inner_xml }
end
if !results.blank?
all_results.concat(results)
next
end
end
end
return all_results.uniq
end
end
end
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