Generic xml methods needed in numerous places throughout FeedTools
| Module | FeedTools::XmlHelper |
| In: |
lib/feed_tools/helpers/xml_helper.rb
|
Generic xml methods needed in numerous places throughout FeedTools
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.
# File lib/feed_tools/helpers/xml_helper.rb, line 181
181: def self.combine_xpaths_all(element, xpath_list, options={})
182: FeedTools::GenericHelper.validate_options([ :select_result_value ],
183: options.keys)
184: options = { :select_result_value => false }.merge(options)
185:
186: all_results = []
187: result = []
188: if element.nil?
189: return []
190: end
191: for xpath in xpath_list
192: # Namespace aware
193: results = REXML::XPath.liberal_match(element, xpath,
194: FEED_TOOLS_NAMESPACES)
195: if options[:select_result_value] && !results.nil? && !results.empty?
196: results =
197: results.map { |x| x.respond_to?(:value) ? x.value : x.to_s }
198: end
199: if results.blank?
200: results = REXML::XPath.liberal_match(element, xpath)
201: else
202: all_results.concat(results)
203: next
204: end
205:
206: # Namespace unaware
207: if options[:select_result_value] && !results.nil? && !results.empty?
208: results =
209: results.map { |x| x.respond_to?(:value) ? x.value : x.to_s }
210: end
211: if !results.blank?
212: all_results.concat(results)
213: next
214: end
215: end
216: for xpath in xpath_list
217: if xpath =~ /^\w+$/
218: results = []
219: for child in element.children
220: if child.class == REXML::Element
221: if child.name.downcase == xpath.downcase
222: results << child
223: end
224: end
225: end
226: if options[:select_result_value] && !results.nil? && !results.empty?
227: results =
228: results.map { |x| x.inner_xml }
229: end
230: if !results.blank?
231: all_results.concat(results)
232: next
233: end
234: end
235: end
236: return all_results.uniq
237: end
Selects the first non-blank result.
# File lib/feed_tools/helpers/xml_helper.rb, line 32
32: def self.select_not_blank(results, &block)
33: if results.kind_of? Array
34: for result in results
35: blank_result = false
36: if !block.nil?
37: blank_result = block.call(result)
38: else
39: blank_result = result.to_s.blank?
40: end
41: unless result.nil? || blank_result
42: return result
43: end
44: end
45: else
46: blank_result = false
47: if !block.nil?
48: blank_result = block.call(results)
49: else
50: blank_result = results.to_s.blank?
51: end
52: unless results.nil? || blank_result
53: return results
54: end
55: end
56: return nil
57: 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.
# File lib/feed_tools/helpers/xml_helper.rb, line 62
62: def self.try_xpaths(element, xpath_list,
63: options={}, &block)
64: FeedTools::GenericHelper.validate_options([ :select_result_value ],
65: options.keys)
66: options = { :select_result_value => false }.merge(options)
67:
68: result = nil
69: if element.nil?
70: return nil
71: end
72: for xpath in xpath_list
73: # Namespace aware
74: result = REXML::XPath.liberal_first(element, xpath,
75: FEED_TOOLS_NAMESPACES)
76: if options[:select_result_value] && !result.nil?
77: if result.respond_to?(:value)
78: result = result.value
79: else
80: result = result.to_s
81: end
82: end
83: blank_result = false
84: if block_given?
85: blank_result = yield(result)
86: else
87: blank_result = result.to_s.blank?
88: end
89: if !blank_result
90: if result.respond_to? :strip
91: result.strip!
92: end
93: return result
94: end
95:
96: # Namespace unaware
97: result = REXML::XPath.liberal_first(element, xpath)
98: if options[:select_result_value] && !result.nil?
99: if result.respond_to?(:value)
100: result = result.value
101: else
102: result = result.to_s
103: end
104: end
105: blank_result = false
106: if block_given?
107: blank_result = yield(result)
108: else
109: blank_result = result.to_s.blank?
110: end
111: if !blank_result
112: if result.respond_to? :strip
113: result.strip!
114: end
115: return result
116: end
117: end
118: return nil
119: 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.
# File lib/feed_tools/helpers/xml_helper.rb, line 124
124: def self.try_xpaths_all(element, xpath_list, options={})
125: FeedTools::GenericHelper.validate_options([ :select_result_value ],
126: options.keys)
127: options = { :select_result_value => false }.merge(options)
128:
129: results = []
130: if element.nil?
131: return []
132: end
133: for xpath in xpath_list
134: # Namespace aware
135: results = REXML::XPath.liberal_match(element, xpath,
136: FEED_TOOLS_NAMESPACES)
137: if options[:select_result_value] && !results.nil? && !results.empty?
138: results =
139: results.map { |x| x.respond_to?(:value) ? x.value : x.to_s }
140: end
141: if results.blank?
142: results = REXML::XPath.liberal_match(element, xpath)
143: else
144: return results
145: end
146:
147: # Namespace unaware
148: if options[:select_result_value] && !results.nil? && !results.empty?
149: results =
150: results.map { |x| x.respond_to?(:value) ? x.value : x.to_s }
151: end
152: if !results.blank?
153: return results
154: end
155: end
156: for xpath in xpath_list
157: if xpath =~ /^\w+$/
158: results = []
159: for child in element.children
160: if child.class == REXML::Element
161: if child.name.downcase == xpath.downcase
162: results << child
163: end
164: end
165: end
166: if options[:select_result_value] && !results.nil? && !results.empty?
167: results =
168: results.map { |x| x.inner_xml }
169: end
170: if !results.blank?
171: return results
172: end
173: end
174: end
175: return []
176: end