/usr/lib/ruby/1.8/mechanize/form.rb is in libwww-mechanize-ruby1.8 1.0.0-1.
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require 'mechanize/form/file_upload'
require 'mechanize/form/button'
require 'mechanize/form/image_button'
require 'mechanize/form/radio_button'
require 'mechanize/form/check_box'
require 'mechanize/form/multi_select_list'
require 'mechanize/form/select_list'
require 'mechanize/form/option'
class Mechanize
# =Synopsis
# This class encapsulates a form parsed out of an HTML page. Each type
# of input fields available in a form can be accessed through this object.
# See GlobalForm for more methods.
#
# ==Example
# Find a form and print out its fields
# form = page.forms.first # => Mechanize::Form
# form.fields.each { |f| puts f.name }
# Set the input field 'name' to "Aaron"
# form['name'] = 'Aaron'
# puts form['name']
class Form
attr_accessor :method, :action, :name
attr_reader :fields, :buttons, :file_uploads, :radiobuttons, :checkboxes
attr_accessor :enctype
alias :elements :fields
attr_reader :form_node
attr_reader :page
def initialize(node, mech=nil, page=nil)
@enctype = node['enctype'] || 'application/x-www-form-urlencoded'
@form_node = node
@action = Util.html_unescape(node['action'])
@method = (node['method'] || 'GET').upcase
@name = node['name']
@clicked_buttons = []
@page = page
@mech = mech
parse
end
# Returns whether or not the form contains a field with +field_name+
def has_field?(field_name)
! fields.find { |f| f.name.eql? field_name }.nil?
end
alias :has_key? :has_field?
def has_value?(value)
! fields.find { |f| f.value.eql? value }.nil?
end
def keys; fields.map { |f| f.name }; end
def values; fields.map { |f| f.value }; end
def submits ; @submits ||= buttons.select { |f| f.class == Submit }; end
def resets ; @resets ||= buttons.select { |f| f.class == Reset }; end
def texts ; @texts ||= fields.select { |f| f.class == Text }; end
def hiddens ; @hiddens ||= fields.select { |f| f.class == Hidden }; end
def textareas; @textareas ||= fields.select { |f| f.class == Textarea }; end
def submit_button?(button_name) !! submits.find{|f| f.name == button_name}; end
def reset_button?(button_name) !! resets.find{|f| f.name == button_name}; end
def text_field?(field_name) !! texts.find{|f| f.name == field_name}; end
def hidden_field?(field_name) !! hiddens.find{|f| f.name == field_name}; end
def textarea_field?(field_name) !!textareas.find{|f| f.name == field_name}; end
# Add a field with +field_name+ and +value+
def add_field!(field_name, value = nil)
fields << Field.new({'name' => field_name}, value)
end
# This method sets multiple fields on the form. It takes a list of field
# name, value pairs. If there is more than one field found with the
# same name, this method will set the first one found. If you want to
# set the value of a duplicate field, use a value which is a Hash with
# the key as the index in to the form. The index
# is zero based. For example, to set the second field named 'foo', you
# could do the following:
# form.set_fields( :foo => { 1 => 'bar' } )
def set_fields(fields = {})
fields.each do |k,v|
case v
when Hash
v.each do |index, value|
self.fields_with(:name => k.to_s).[](index).value = value
end
else
value = nil
index = 0
[v].flatten.each do |val|
index = val.to_i unless value.nil?
value = val if value.nil?
end
self.fields_with(:name => k.to_s).[](index).value = value
end
end
end
# Fetch the value of the first input field with the name passed in
# ==Example
# Fetch the value set in the input field 'name'
# puts form['name']
def [](field_name)
f = field(field_name)
f && f.value
end
# Set the value of the first input field with the name passed in
# ==Example
# Set the value in the input field 'name' to "Aaron"
# form['name'] = 'Aaron'
def []=(field_name, value)
f = field(field_name)
if f.nil?
add_field!(field_name, value)
else
f.value = value
end
end
# Treat form fields like accessors.
def method_missing(id,*args)
method = id.to_s.gsub(/=$/, '')
if field(method)
return field(method).value if args.empty?
return field(method).value = args[0]
end
super
end
# Submit this form with the button passed in
def submit button=nil, headers = {}
@mech.submit(self, button, headers)
end
# Submit form using +button+. Defaults
# to the first button.
def click_button(button = buttons.first)
submit(button)
end
# This method is sub-method of build_query.
# It converts charset of query value of fields into expected one.
def proc_query(field)
return unless field.query_value
field.query_value.map{|(name, val)|
[from_native_charset(name), from_native_charset(val.to_s)]
}
end
private :proc_query
def from_native_charset str
Util.from_native_charset(str,page && page.encoding)
end
private :from_native_charset
# This method builds an array of arrays that represent the query
# parameters to be used with this form. The return value can then
# be used to create a query string for this form.
def build_query(buttons = [])
query = []
(fields + checkboxes).sort.each do |f|
case f
when Form::CheckBox
if f.checked
qval = proc_query(f)
query.push(*qval)
end
when Form::Field
qval = proc_query(f)
query.push(*qval)
end
end
radio_groups = {}
radiobuttons.each do |f|
fname = from_native_charset(f.name)
radio_groups[fname] ||= []
radio_groups[fname] << f
end
# take one radio button from each group
radio_groups.each_value do |g|
checked = g.select {|f| f.checked}
if checked.size == 1
f = checked.first
qval = proc_query(f)
query.push(*qval)
elsif checked.size > 1
raise "multiple radiobuttons are checked in the same group!"
end
end
@clicked_buttons.each { |b|
qval = proc_query(b)
query.push(*qval)
}
query
end
# This method adds a button to the query. If the form needs to be
# submitted with multiple buttons, pass each button to this method.
def add_button_to_query(button)
@clicked_buttons << button
end
# This method calculates the request data to be sent back to the server
# for this form, depending on if this is a regular post, get, or a
# multi-part post,
def request_data
query_params = build_query()
case @enctype.downcase
when /^multipart\/form-data/
boundary = rand_string(20)
@enctype = "multipart/form-data; boundary=#{boundary}"
params = []
query_params.each { |k,v| params << param_to_multipart(k, v) unless k.nil? }
@file_uploads.each { |f| params << file_to_multipart(f) }
params.collect { |p| "--#{boundary}\r\n#{p}" }.join('') +
"--#{boundary}--\r\n"
else
Mechanize::Util.build_query_string(query_params)
end
end
# Removes all fields with name +field_name+.
def delete_field!(field_name)
@fields.delete_if{ |f| f.name == field_name}
end
##
# :method: field_with(criteria)
#
# Find one field that matches +criteria+
# Example:
# form.field_with(:value => /foo/).value = 'hello'
##
# :method: fields_with(criteria)
#
# Find all fields that match +criteria+
# Example:
# form.fields_with(:value => /foo/).each do |field|
# field.value = 'hello!'
# end
##
# :method: button_with(criteria)
#
# Find one button that matches +criteria+
# Example:
# form.button_with(:value => /submit/).value = 'hello'
##
# :method: buttons_with(criteria)
#
# Find all buttons that match +criteria+
# Example:
# form.buttons_with(:value => /submit/).each do |button|
# button.value = 'hello!'
# end
##
# :method: file_upload_with(criteria)
#
# Find one file upload field that matches +criteria+
# Example:
# form.file_upload_with(:file_name => /picture/).value = 'foo'
##
# :method: file_uploads_with(criteria)
#
# Find all file upload fields that match +criteria+
# Example:
# form.file_uploads_with(:file_name => /picutre/).each do |field|
# field.value = 'foo!'
# end
##
# :method: radiobutton_with(criteria)
#
# Find one radio button that matches +criteria+
# Example:
# form.radiobutton_with(:name => /woo/).check
##
# :method: radiobuttons_with(criteria)
#
# Find all radio buttons that match +criteria+
# Example:
# form.radiobuttons_with(:name => /woo/).each do |field|
# field.check
# end
##
# :method: checkbox_with(criteria)
#
# Find one checkbox that matches +criteria+
# Example:
# form.checkbox_with(:name => /woo/).check
##
# :method: checkboxes_with(criteria)
#
# Find all checkboxes that match +criteria+
# Example:
# form.checkboxes_with(:name => /woo/).each do |field|
# field.check
# end
# Woo! meta programming time
{ :field => :fields,
:button => :buttons,
:file_upload => :file_uploads,
:radiobutton => :radiobuttons,
:checkbox => :checkboxes,
}.each do |singular,plural|
eval(<<-eomethod)
def #{plural}_with criteria = {}
criteria = {:name => criteria} if String === criteria
f = #{plural}.find_all do |thing|
criteria.all? { |k,v| v === thing.send(k) }
end
yield f if block_given?
f
end
def #{singular}_with criteria = {}
f = #{plural}_with(criteria).first
yield f if block_given?
f
end
alias :#{singular} :#{singular}_with
eomethod
end
private
def parse
@fields = []
@buttons = []
@file_uploads = []
@radiobuttons = []
@checkboxes = []
# Find all input tags
form_node.search('input').each do |node|
type = (node['type'] || 'text').downcase
name = node['name']
next if name.nil? && !(type == 'submit' || type =='button')
case type
when 'radio'
@radiobuttons << RadioButton.new(node, self)
when 'checkbox'
@checkboxes << CheckBox.new(node, self)
when 'file'
@file_uploads << FileUpload.new(node, nil)
when 'submit'
@buttons << Submit.new(node)
when 'button'
@buttons << Button.new(node)
when 'reset'
@buttons << Reset.new(node)
when 'image'
@buttons << ImageButton.new(node)
when 'hidden'
@fields << Hidden.new(node, node['value'] || '')
when 'text'
@fields << Text.new(node, node['value'] || '')
when 'textarea'
@fields << Textarea.new(node, node['value'] || '')
else
@fields << Field.new(node, node['value'] || '')
end
end
# Find all textarea tags
form_node.search('textarea').each do |node|
next if node['name'].nil?
@fields << Field.new(node, node.inner_text)
end
# Find all select tags
form_node.search('select').each do |node|
next if node['name'].nil?
if node.has_attribute? 'multiple'
@fields << MultiSelectList.new(node)
else
@fields << SelectList.new(node)
end
end
# Find all submit button tags
# FIXME: what can I do with the reset buttons?
form_node.search('button').each do |node|
type = (node['type'] || 'submit').downcase
next if type == 'reset'
@buttons << Button.new(node)
end
end
def rand_string(len = 10)
chars = ("a".."z").to_a + ("A".."Z").to_a
string = ""
1.upto(len) { |i| string << chars[rand(chars.size-1)] }
string
end
def mime_value_quote(str)
str.gsub(/(["\r\\])/){|s| '\\' + s}
end
def param_to_multipart(name, value)
return "Content-Disposition: form-data; name=\"" +
"#{mime_value_quote(name)}\"\r\n" +
"\r\n#{value}\r\n"
end
def file_to_multipart(file)
file_name = file.file_name ? ::File.basename(file.file_name) : ''
body = "Content-Disposition: form-data; name=\"" +
"#{mime_value_quote(file.name)}\"; " +
"filename=\"#{mime_value_quote(file_name)}\"\r\n" +
"Content-Transfer-Encoding: binary\r\n"
if file.file_data.nil? and ! file.file_name.nil?
file.file_data = ::File.open(file.file_name, "rb") { |f| f.read }
file.mime_type = WEBrick::HTTPUtils.mime_type(file.file_name,
WEBrick::HTTPUtils::DefaultMimeTypes)
end
if file.mime_type != nil
body << "Content-Type: #{file.mime_type}\r\n"
end
body <<
if file.file_data.respond_to? :read
"\r\n#{file.file_data.read}\r\n"
else
"\r\n#{file.file_data}\r\n"
end
body
end
end
end
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