require 'haml/helpers/action_view_mods'
require 'haml/helpers/action_view_extensions'
module Haml
# This module contains various helpful methods to make it easier to do
# various tasks. Haml::Helpers is automatically included in the context
# that a Haml template is parsed in, so all these methods are at your
# disposal from within the template.
module Helpers
self.extend self
@@action_view_defined = defined?(ActionView)
@@force_no_action_view = false
# Returns whether or not ActionView is installed on the system.
def self.action_view?
@@action_view_defined
end
# Note: this does *not* need to be called
# when using Haml helpers normally
# in Rails.
#
# Initializes the current object
# as though it were in the same context
# as a normal ActionView rendering
# using Haml.
# This is useful if you want to use the helpers in a context
# other than the normal setup with ActionView.
# For example:
#
# context = Object.new
# class << context
# include Haml::Helpers
# end
# context.init_haml_helpers
# context.open :p, "Stuff"
#
def init_haml_helpers
@haml_is_haml = true
@haml_stack = [Haml::Buffer.new]
nil
end
# Isolates the whitespace-sensitive tags in the string and uses preserve
# to convert any endlines inside them into HTML entities for endlines.
def find_and_preserve(input)
input = input.to_s
input.gsub(/<(textarea|code|pre)([^>]*)>(.*?)(<\/\1>)/im) do
"<#{$1}#{$2}>#{preserve($3)}"
end
end
# Takes any string, finds all the endlines and converts them to
# HTML entities for endlines so they'll render correctly in
# whitespace-sensitive tags without screwing up the indentation.
def preserve(input)
input.gsub(/\n/, '
').gsub(/\r/, '')
end
alias_method :flatten, :preserve
# Takes an Enumerable object and a block
# and iterates over the object,
# yielding each element to a Haml block
# and putting the result into elements.
# This creates a list of the results of the block.
# For example:
#
# = list_of([['hello'], ['yall']]) do |i|
# = i[0]
#
# Produces:
#
# hello
# yall
#
# And
#
# = list_of({:title => 'All the stuff', :description => 'A book about all the stuff.'}) do |key, val|
# %h3= key.humanize
# %p= val
#
# Produces:
#
#
# Title
# All the stuff
#
#
# Description
# A book about all the stuff.
#
#
def list_of(array, &block) # :yields: item
to_return = array.collect do |i|
result = capture_haml(i, &block)
if result.count("\n") > 1
result.gsub!("\n", "\n ")
result = "\n #{result.strip}\n"
else
result.strip!
end
"#{result}"
end
to_return.join("\n")
end
# Returns a hash containing default assignments for the xmlns and xml:lang
# attributes of the html HTML element.
# It also takes an optional argument for the value of xml:lang and lang,
# which defaults to 'en-US'.
# For example,
#
# %html{html_attrs}
#
# becomes
#
#
#
def html_attrs(lang = 'en-US')
{:xmlns => "http://www.w3.org/1999/xhtml", 'xml:lang' => lang, :lang => lang}
end
# Increments the number of tabs the buffer automatically adds
# to the lines of the template.
# For example:
#
# %h1 foo
# - tab_up
# %p bar
# - tab_down
# %strong baz
#
# Produces:
#
# foo
# bar
# baz
#
def tab_up(i = 1)
buffer.tabulation += i
end
# Increments the number of tabs the buffer automatically adds
# to the lines of the template.
#
# See tab_up.
def tab_down(i = 1)
buffer.tabulation -= i
end
# Surrounds the given block of Haml code with the given characters,
# with no whitespace in between.
# For example:
#
# = surround '(', ')' do
# %a{:href => "food"} chicken
#
# Produces:
#
# (chicken)
#
# and
#
# = surround '*' do
# %strong angry
#
# Produces:
#
# *angry*
#
def surround(front, back = nil, &block)
back ||= front
output = capture_haml(&block)
"#{front}#{output.chomp}#{back}\n"
end
# Prepends the given character to the beginning of the Haml block,
# with no whitespace between.
# For example:
#
# = precede '*' do
# %span.small Not really
#
# Produces:
#
# *Not really
#
def precede(char, &block)
"#{char}#{capture_haml(&block).chomp}\n"
end
# Appends the given character to the end of the Haml block,
# with no whitespace between.
# For example:
#
# click
# = succeed '.' do
# %a{:href=>"thing"} here
#
# Produces:
#
# click
# here.
#
def succeed(char, &block)
"#{capture_haml(&block).chomp}#{char}\n"
end
# Captures the result of the given block of Haml code,
# gets rid of the excess indentation,
# and returns it as a string.
# For example, after the following,
#
# .foo
# - foo = capture_haml(13) do |a|
# %p= a
#
# the local variable foo would be assigned to "13
\n".
#
def capture_haml(*args, &block)
capture_haml_with_buffer(buffer.buffer, *args, &block)
end
# Outputs text directly to the Haml buffer, with the proper tabulation
def puts(text = "")
buffer.buffer << (' ' * buffer.tabulation) << text.to_s << "\n"
nil
end
#
# call-seq:
# open(name, attributes = {}) {...}
# open(name, text, attributes = {}) {...}
#
# Creates an HTML tag with the given name and optionally text and attributes.
# Can take a block that will be executed
# between when the opening and closing tags are output.
# If the block is a Haml block or outputs text using puts,
# the text will be properly indented.
#
# For example,
#
# open :table do
# open :tr do
# open :td, {:class => 'cell'} do
# open :strong, "strong!"
# puts "data"
# end
# open :td do
# puts "more_data"
# end
# end
# end
#
# outputs
#
#
#
# |
#
# strong!
#
# data
# |
#
# more_data
# |
#
#
#
def open(name, attributes = {}, alt_atts = {}, &block)
text = nil
if attributes.is_a? String
text = attributes
attributes = alt_atts
end
if text.nil? && block.nil?
puts "<#{name}#{Haml::Precompiler.build_attributes(buffer.options[:attr_wrapper], attributes)} />"
return nil
end
puts "<#{name}#{Haml::Precompiler.build_attributes(buffer.options[:attr_wrapper], attributes)}>"
unless text && text.empty?
tab_up
# Print out either the text (using push_text) or call the block and add an endline
if text
puts(text)
elsif block
block.call
end
tab_down
end
puts ""
nil
end
private
# Gets a reference to the current Haml::Buffer object.
def buffer
@haml_stack[-1]
end
# Gives a proc the same local "_hamlout" and "_erbout" variables
# that the current template has.
def bind_proc(&proc)
_hamlout = buffer
_erbout = _hamlout.buffer
proc { |*args| proc.call(*args) }
end
# Performs the function of capture_haml, assuming local_buffer
# is where the output of block goes.
def capture_haml_with_buffer(local_buffer, *args, &block)
position = local_buffer.length
block.call *args
captured = local_buffer.slice!(position..-1)
min_tabs = nil
captured.each do |line|
tabs = line.index(/[^ ]/)
min_tabs ||= tabs
min_tabs = min_tabs > tabs ? tabs : min_tabs
end
result = captured.map do |line|
line[min_tabs..-1]
end
result.to_s
end
# Returns whether or not the current template is a Haml template.
#
# This function, unlike other Haml::Helpers functions,
# also works in other ActionView templates,
# where it will always return false.
def is_haml?
@haml_is_haml
end
include ActionViewExtensions if self.const_defined? "ActionViewExtensions"
end
end
module ActionView
class Base # :nodoc:
def is_haml?
false
end
end
end