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December 18, 2015 11:39
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Tree Builder DSL
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| class Tree | |
| attr_accessor :elements | |
| def initialize(&block) | |
| @elements = '' | |
| instance_eval(&block) | |
| end | |
| def method_missing(method_name, *args, &block) | |
| @elements << "<#{method_name}>" | |
| yield if block | |
| @elements << "</#{method_name}>" | |
| end | |
| def inspect | |
| puts @elements | |
| end | |
| end | |
| Tree.new do | |
| table do | |
| tr do | |
| td | |
| td | |
| end | |
| end | |
| end.inspect | |
| #<table><tr><td></td><td></td></tr></table> | |
| class HtmlBuilder | |
| attr_accessor :result | |
| def initialize(&block) | |
| @result = '<html>' | |
| instance_eval(&block) | |
| @result << '</html>' | |
| end | |
| def method_missing(method_name, *args, &block) | |
| @result << "<#{method_name}" | |
| @result << parse_args(args.last) if args.last.is_a?(Hash) | |
| @result << ">" | |
| yield if block | |
| @result << "</#{method_name}>" | |
| end | |
| def text(str) | |
| @result << str | |
| end | |
| def parse_args(args) | |
| ret = ' ' | |
| args.each_pair {|key, value| ret << "#{key}=\"#{value}\""} | |
| ret | |
| end | |
| def inspect | |
| puts @result | |
| end | |
| end | |
| HtmlBuilder.new do | |
| title do | |
| text "whatup" | |
| end | |
| body :onload => "alert('hi')" do | |
| div :id => "hi", :class => "bye" do | |
| text "hi_again" | |
| end | |
| end | |
| end.inspect | |
| #<html><title>whatup</title><body onload="alert('hi')"><div id="hi"class="bye">hi_again</div></body></html> |
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