Class: Hpricot::Elements

Inherits:
Array
  • Object
show all
Defined in:
lib/hpricot/inspect.rb,
lib/hpricot/elements.rb

Overview

and Hpricot::Container::Trav.

Constant Summary collapse

ATTR_RE = 
%r!\[ *(?:(@)([\w\(\)-]+)|([\w\(\)-]+\(\))) *([~\!\|\*$\^=]*) *'?"?([^'"]*)'?"? *\]!i
BRACK_RE = 
%r!(\[) *([^\]]*) *\]+!i
FUNC_RE = 
%r!(:)?([a-zA-Z0-9\*_-]*)\( *[\"']?([^ \)]*?)['\"]? *\)!
CUST_RE = 
%r!(:)([a-zA-Z0-9\*_-]*)()!
CATCH_RE = 
%r!([:\.#]*)([a-zA-Z0-9\*_-]+)!

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.expand(ele1, ele2, excl = false) ⇒ Object

Given two elements, attempt to gather an Elements array of everything between (and including) those two elements.



315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
 
# File 'lib/hpricot/elements.rb', line 315

def self.expand(ele1, ele2, excl=false)
  ary = []
  offset = excl ? -1 : 0

  if ele1 and ele2
    # let's quickly take care of siblings
    if ele1.parent == ele2.parent
      ary = ele1.parent.children[ele1.node_position..(ele2.node_position+offset)]
    else
      # find common parent
      p, ele1_p = ele1, [ele1]
      ele1_p.unshift p while p.respond_to?(:parent) and p = p.parent
      p, ele2_p = ele2, [ele2]
      ele2_p.unshift p while p.respond_to?(:parent) and p = p.parent
      common_parent = ele1_p.zip(ele2_p).select { |p1, p2| p1 == p2 }.flatten.last

      child = nil
      if ele1 == common_parent
        child = ele2
      elsif ele2 == common_parent
        child = ele1
      end

      if child
        ary = common_parent.children[0..(child.node_position+offset)]
      end
    end
  end

  return Elements[*ary]
end

.filter(nodes, expr, truth = true) ⇒ Object 



270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
 
# File 'lib/hpricot/elements.rb', line 270

def self.filter(nodes, expr, truth = true)
    until expr.empty?
        _, *m = *expr.match(/^(?:#{ATTR_RE}|#{BRACK_RE}|#{FUNC_RE}|#{CUST_RE}|#{CATCH_RE})/)
        break unless _

        expr = $'
        m.compact!
        if m[0] == '@'
            m[0] = "@#{m.slice!(2,1)}"
        end

        if m[0] == '[' && m[1] =~ /^\d+$/
            m = [":", "nth", m[1].to_i-1]
        end

        if m[0] == ":" && m[1] == "not"
            nodes, = Elements.filter(nodes, m[2], false)
        elsif "#{m[0]}#{m[1]}" =~ /^(:even|:odd)$/
            new_nodes = []
            nodes.each_with_index {|n,i| new_nodes.push(n) if (i % 2 == (m[1] == "even" ? 0 : 1)) }
            nodes = new_nodes
        elsif "#{m[0]}#{m[1]}" =~ /^(:first|:last)$/
            nodes = [nodes.send(m[1])]
        else
            meth = "filter[#{m[0]}#{m[1]}]" unless m[0].empty?
            if meth and Traverse.method_defined? meth
                args = m[2..-1]
            else
                meth = "filter[#{m[0]}]"
                if Traverse.method_defined? meth
                    args = m[1..-1]
                end
            end
            i = -1
            nodes = Elements[*nodes.find_all do |x| 
                                  i += 1
                                  x.send(meth, *([*args] + [i])) ? truth : !truth
                              end]
        end
    end
    [nodes, expr]
end

Instance Method Details

#add_class(class_name) ⇒ Object

Adds the class to all matched elements.

(doc/"p").add_class("bacon")

Now all paragraphs will have class=“bacon”.



222
223
224
225
226
227
228
229
 
# File 'lib/hpricot/elements.rb', line 222

def add_class class_name
  each do |el|
    next unless el.respond_to? :get_attribute
    classes = el.get_attribute('class').to_s.split(" ")
    el.set_attribute('class', classes.push(class_name).uniq.join(" "))
  end
  self
end

#after(str = nil, &blk) ⇒ Object

Just after each element in this list, add some HTML. Pass in an HTML str, which is turned into Hpricot elements.



150
151
152
 
# File 'lib/hpricot/elements.rb', line 150

def after(str = nil, &blk)
  each { |x| x.parent.insert_after x.make(str, &blk), x }
end

#append(str = nil, &blk) ⇒ Object

Add to the end of the contents inside each element in this list. Pass in an HTML str, which is turned into Hpricot elements.



132
133
134
 
# File 'lib/hpricot/elements.rb', line 132

def append(str = nil, &blk)
  each { |x| x.html(x.children + x.make(str, &blk)) }
end

#at(expr, &blk) ⇒ Object Also known as: %

Searches this list for the first element (or child of these elements) matching the CSS or XPath expression expr. Root is assumed to be the element scanned.

See Hpricot::Container::Trav.at for more.



67
68
69
 
# File 'lib/hpricot/elements.rb', line 67

def at(expr, &blk)
  search(expr, &blk).first
end

#attr(key, value = nil, &blk) ⇒ Object Also known as: set

Gets and sets attributes on all matched elements.

Pass in a key on its own and this method will return the string value assigned to that attribute for the first elements. Or nil if the attribute isn’t found.

doc.search("a").attr("href")
  #=> "http://hacketyhack.net/"

Or, pass in a key and value. This will set an attribute for all matched elements.

doc.search("p").attr("class", "basic")

You may also use a Hash to set a series of attributes:

(doc/"a").attr(:class => "basic", :href => "http://hackety.org/")

Lastly, a block can be used to rewrite an attribute based on the element it belongs to. The block will pass in an element. Return from the block the new value of the attribute.

records.attr("href") { |e| e['href'] + "#top" }

This example adds a #top anchor to each link.



201
202
203
204
205
206
207
208
209
210
211
212
213
214
 
# File 'lib/hpricot/elements.rb', line 201

def attr key, value = nil, &blk
  if value or blk
    each do |el|
      el.set_attribute(key, value || blk[el])
    end
    return self      
  end    
  if key.is_a? Hash
    key.each { |k,v| self.attr(k,v) }
    return self
  else
    return self[0].get_attribute(key)
  end
end

#before(str = nil, &blk) ⇒ Object

Add some HTML just previous to each element in this list. Pass in an HTML str, which is turned into Hpricot elements.



144
145
146
 
# File 'lib/hpricot/elements.rb', line 144

def before(str = nil, &blk)
  each { |x| x.parent.insert_before x.make(str, &blk), x }
end

#empty ⇒ Object

Empty the elements in this list, by removing their insides.

doc = Hpricot("<p> We have <i>so much</i> to say.</p>")
doc.search("i").empty
doc.to_html
  => "<p> We have <i></i> to say.</p>"



126
127
128
 
# File 'lib/hpricot/elements.rb', line 126

def empty
  each { |x| x.inner_html = nil }
end

#filter(expr) ⇒ Object 



347
348
349
350
 
# File 'lib/hpricot/elements.rb', line 347

def filter(expr)
    nodes, = Elements.filter(self, expr)
    nodes
end

#inner_html(*string) ⇒ Object Also known as: html, innerHTML

Returns an HTML fragment built of the contents of each element in this list.

If a HTML string is supplied, this method acts like inner_html=.



82
83
84
85
86
87
88
 
# File 'lib/hpricot/elements.rb', line 82

def inner_html(*string)
  if string.empty?
    map { |x| x.inner_html }.join
  else
    x = self.inner_html = string.pop || x
  end
end

#inner_html=(string) ⇒ Object Also known as: html=, innerHTML=

Replaces the contents of each element in this list. Supply an HTML string, which is loaded into Hpricot objects and inserted into every element in this list.



95
96
97
 
# File 'lib/hpricot/elements.rb', line 95

def inner_html=(string)
  each { |x| x.inner_html = string }
end

#inner_text ⇒ Object Also known as: text

Returns an string containing the text contents of each element in this list. All HTML tags are removed.



103
104
105
 
# File 'lib/hpricot/elements.rb', line 103

def inner_text
  map { |x| x.inner_text }.join
end

#not(expr) ⇒ Object 



352
353
354
355
356
357
358
359
 
# File 'lib/hpricot/elements.rb', line 352

def not(expr)
    if expr.is_a? Traverse
        nodes = self - [expr]
    else
        nodes, = Elements.filter(self, expr, false)
    end
    nodes
end

#prepend(str = nil, &blk) ⇒ Object

Add to the start of the contents inside each element in this list. Pass in an HTML str, which is turned into Hpricot elements.



138
139
140
 
# File 'lib/hpricot/elements.rb', line 138

def prepend(str = nil, &blk)
  each { |x| x.html(x.make(str, &blk) + x.children) }
end

#pretty_print(q) ⇒ Object 



6
7
8
 
# File 'lib/hpricot/inspect.rb', line 6

def pretty_print(q)
  q.object_group(self) { super }
end

#remove ⇒ Object

Remove all elements in this list from the document which contains them.

doc = Hpricot("<html>Remove this: <b>here</b></html>")
doc.search("b").remove
doc.to_html
  => "<html>Remove this: </html>"



115
116
117
 
# File 'lib/hpricot/elements.rb', line 115

def remove
  each { |x| x.parent.children.delete(x) }
end

#remove_attr(name) ⇒ Object

Remove an attribute from each of the matched elements.

(doc/"input").remove_attr("disabled")



235
236
237
238
239
240
241
 
# File 'lib/hpricot/elements.rb', line 235

def remove_attr name
  each do |el|
    next unless el.respond_to? :remove_attribute
    el.remove_attribute(name)
  end
  self      
end

#remove_class(name = nil) ⇒ Object

Removes a class from all matched elements.

(doc/"span").remove_class("lightgrey")

Or, to remove all classes:

(doc/"span").remove_class



251
252
253
254
255
256
257
258
259
260
261
262
 
# File 'lib/hpricot/elements.rb', line 251

def remove_class name = nil
  each do |el|
    next unless el.respond_to? :get_attribute
    if name
      classes = el.get_attribute('class').to_s.split(" ")
      el.set_attribute('class', (classes - [name]).uniq.join(" "))
    else
      el.remove_attribute("class")
    end
  end
  self      
end

#search(*expr, &blk) ⇒ Object Also known as: /

Searches this list for any elements (or children of these elements) matching the CSS or XPath expression expr. Root is assumed to be the element scanned.

See Hpricot::Container::Trav.search for more.



58
59
60
 
# File 'lib/hpricot/elements.rb', line 58

def search(*expr,&blk)
  Elements[*map { |x| x.search(*expr,&blk) }.flatten.uniq]
end

#to_html ⇒ Object Also known as: to_s

Convert this group of elements into a complete HTML fragment, returned as a string.



74
75
76
 
# File 'lib/hpricot/elements.rb', line 74

def to_html
  map { |x| x.output("") }.join
end

#wrap(str = nil, &blk) ⇒ Object

Wraps each element in the list inside the element created by HTML str. If more than one element is found in the string, Hpricot locates the deepest spot inside the first element.

doc.search("a[@href]").
    wrap(%{<div class="link"><div class="link_inner"></div></div>})

This code wraps every link on the page inside a div.link and a div.link_inner nest.



162
163
164
165
166
167
168
169
170
171
172
173
 
# File 'lib/hpricot/elements.rb', line 162

def wrap(str = nil, &blk)
  each do |x|
    wrap = x.make(str, &blk)
    nest = wrap.detect { |w| w.respond_to? :children }
    unless nest
      raise "No wrapping element found."
    end
    x.parent.replace_child(x, wrap)
    nest = nest.children.first until nest.empty?
    nest.html(nest.children + [x])
  end
end