Class: Emote

Inherits:
Object
  • Object
show all
Defined in:
lib/yescode/emote.rb

Defined Under Namespace

Modules: Helpers

Constant Summary collapse

PATTERN = 
/
  ^[^\S\n]*(%)[^\S\n]*(.*?)(?:\n|\Z) | # Ruby evaluated lines
  (<\?)\s+(.*?)\s+\?>                | # Multiline Ruby blocks
  (\$\{)(.*?)\}                      | # Ruby evaluated to strings unescaped
  (\{\{)(.*?)\}\}                      # Ruby evaluated to strings html escaped
/mx

Class Method Summary collapse

Class Method Details

.h(value) ⇒ Object 



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# File 'lib/yescode/emote.rb', line 31

def self.h(value)
  CGI.escapeHTML(value.to_s)
end

.parse(template, context = self, vars = [], name = "template") ⇒ Object 



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# File 'lib/yescode/emote.rb', line 62

def self.parse(template, context = self, vars = [], name = "template")
  context.instance_eval(src(template, vars), name, -1)
end

.src(template, vars = []) ⇒ Object 



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# File 'lib/yescode/emote.rb', line 35

def self.src(template, vars = [])
  terms = template.split(PATTERN)

  code = "proc do |params, __o| params ||= {}; __o ||= '';"

  vars.each do |var|
    code << format("%<val>s = params[%<key>p];", { val: var, key: var })
  end

  while (term = terms.shift)
    code << case term
            when "<?"
              "#{terms.shift}\n"
            when "%"
              "#{terms.shift}\n"
            when "${"
              "__o << (#{terms.shift}).to_s\n"
            when "{{"
              "__o << Emote.h(#{terms.shift}).to_s\n"
            else
              "__o << #{term.dump}\n"
            end
  end

  code << "__o; end"
end