2006-06-30 15:14:44 +00:00
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module HAML
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class TemplateEngine
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def initialize(base)
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@base = base
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@tab_index = ["", " "]
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2006-07-20 04:01:23 +00:00
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@happy_land = HappyLand.new(@base, @base.assigns)
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2006-06-30 15:14:44 +00:00
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#pre-build the tab index up to 9
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10.times do |num|
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@tab_index << @tab_index.last + " "
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end
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end
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def render(template = "", locals = {})
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@result = ""
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@to_close_queue = []
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2006-07-20 04:01:23 +00:00
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2006-07-19 22:23:01 +00:00
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2006-07-20 04:01:23 +00:00
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@happy_land.set_locals(locals)
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#breakpoint
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2006-06-30 15:14:44 +00:00
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#main loop handling line reading
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#and interpretation
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template.each_line do |line|
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2006-07-02 02:09:44 +00:00
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if line.strip[0, 3] == "!!!"
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@result << %|<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">\n|
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else
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count, line = count_levels(line)
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2006-07-19 22:23:01 +00:00
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#puts count.to_s + "::" + line
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2006-07-02 02:09:44 +00:00
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if count <= @to_close_queue.size && @to_close_queue.size > 0
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2006-07-19 22:23:01 +00:00
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(@to_close_queue.size - count).times { close_tag }
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2006-06-30 15:14:44 +00:00
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end
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2006-07-02 02:09:44 +00:00
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case line.first
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when '.', '#'
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render_div(line)
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when '%'
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render_tag(line)
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when '/'
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render_comment(line)
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when '='
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add template_eval(line[1, line.length])
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else
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add line
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end
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end
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2006-06-30 15:14:44 +00:00
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end
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2006-07-02 02:09:44 +00:00
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@to_close_queue.length.times { close_tag }
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2006-06-30 15:14:44 +00:00
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@result
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end
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2006-06-30 21:40:07 +00:00
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2006-06-30 15:14:44 +00:00
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def add(line)
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2006-06-30 21:40:07 +00:00
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return nil if line.nil?
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2006-07-02 02:09:44 +00:00
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line.each_line { |me| add_single(me) }
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2006-06-30 15:14:44 +00:00
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end
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2006-07-02 02:09:44 +00:00
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def add_single(line = "")
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@result << @tab_index[@to_close_queue.size]
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@result << line.chomp + "\n"
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2006-06-30 15:14:44 +00:00
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end
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def open_tag(name, attributes = {})
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2006-07-19 22:23:01 +00:00
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add "<#{name.to_s}#{build_attributes(attributes)}>"
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@to_close_queue.push(name)
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end
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def one_line_tag(name, value, attributes = {})
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add "<#{name.to_s}#{build_attributes(attributes)}>#{value}</#{name.to_s}>"
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end
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2006-07-20 04:01:23 +00:00
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def print_tag(name, value, attributes = {})
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unless value.empty?
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if one_liner?(value)
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one_line_tag(name, value, attributes)
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else
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open_tag(name, attributes)
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add(value)
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close_tag
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end
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else
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open_tag(name, attributes)
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add(value)
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end
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end
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2006-07-19 22:23:01 +00:00
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#used to create single line tags... aka <hello />
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def atomic_tag(name, attributes = {})
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add "<#{name.to_s}#{build_attributes(attributes)} />"
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end
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def build_attributes(attributes = {})
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return "" if attributes.empty?
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" " + (attributes.collect { |attr_name, val| attr_name.to_s + "='" + val + "'" }).join(" ")
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2006-06-30 15:14:44 +00:00
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end
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def close_tag
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2006-07-02 02:09:44 +00:00
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add "</#{name = @to_close_queue.pop}>"
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2006-06-30 15:14:44 +00:00
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end
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def render_div(line)
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2006-07-02 02:09:44 +00:00
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render_tag("%div" + line)
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2006-06-30 15:14:44 +00:00
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end
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def render_comment(line)
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add "<!-- #{line} -->"
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end
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2006-06-30 21:40:07 +00:00
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def render_tag(line)
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2006-07-20 04:01:23 +00:00
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broken_up = line.scan(/[%]([-_a-z1-9]+)([-_a-z\.\#]*)(\{.*\})?([=\/]?)?([^\n]*)?/)
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broken_up.each do |tag_name, attributes, attributes_hash, action, value|
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attributes = parse_attributes(attributes.to_s)
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unless(attributes_hash.nil? || attributes_hash.empty?)
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attributes_hash = template_eval(attributes_hash)
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attributes = attributes.merge(attributes_hash)
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2006-07-19 22:23:01 +00:00
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end
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2006-07-20 04:01:23 +00:00
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2006-07-19 22:23:01 +00:00
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#check to see if we're a one liner
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if(action == "\/")
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2006-07-20 04:01:23 +00:00
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atomic_tag(tag_name, attributes)
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elsif(action == "=")
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print_tag(tag_name, template_eval(value).to_s, attributes)
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2006-07-19 22:23:01 +00:00
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else
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2006-07-20 04:01:23 +00:00
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print_tag(tag_name, value, attributes)
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2006-06-30 15:14:44 +00:00
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end
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end
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end
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2006-07-20 04:01:23 +00:00
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2006-06-30 15:14:44 +00:00
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def parse_attributes(list)
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attributes = {}
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list.scan(/([#.])([-a-zA-Z_()]+)/).each do |type, property|
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case type
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when "."
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attributes[:class] = property
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when "#"
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attributes[:id] = property
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end
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end
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attributes
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end
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def count_levels(line)
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2006-07-19 22:23:01 +00:00
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[line.index(/[^ ]/)/2, line.strip]
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2006-06-30 15:14:44 +00:00
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end
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2006-07-20 04:01:23 +00:00
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def one_liner?(value)
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((value.length < 50) && value.scan(/\n/).empty?)
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end
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def template_eval(code)
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#@base.instance_eval(code)
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#render :inline => "<%=#{code}%>"
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@happy_land.instance_eval(code)
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end
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end
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class HappyLand #:nodoc
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def initialize(base, hash_of_assigns, hash_of_locals = {})
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base.instance_variables.each do |key|
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value = base.instance_eval(key)
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eval("#{key} = value")
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end
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hash_of_assigns.each do |key, value|
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eval("@#{key} = value")
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end
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@__locals = hash_of_locals
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@__base = base
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end
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def set_locals(hash_of_locals)
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@__locals.merge!(hash_of_locals)
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end
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def instance_eval(code)
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eval(code)
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end
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def method_missing(action, *args, &block)
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if action.to_s.first == "@"
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result = @__base.instance_eval(action)
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else
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begin
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result = @__base.send(action, *args, &block)
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rescue
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result = @__locals[action.to_s] || @__locals[action.to_sym]
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end
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end
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result
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end
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2006-06-30 15:14:44 +00:00
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end
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end
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