Erubis徹底解説

Ruby program: require 'rubygems' # require 'erubis' str = File.read('template.eruby') eruby = Erubis::Eruby.new(str) print eruby.result(binding()) command-line: $ erubis template.eruby # $ erubis -x template.eruby # Ruby $ erubis -z template.eruby # copyright(c) 2009 kuwata-lab.com all rights reserved. 6

HTML str =<<END <%= %> <%= var %> <%== %> <%== var %> END eruby = Erubis::Eruby.new(str, :escape=>true) puts eruby.result(:var=>"<B&B>") output: <B&am;> <B&B> (choosability) copyright(c) 2009 kuwata-lab.com all rights reserved. 7

‣ <% %> [% %] [% for x in @list %] <li>[%= x %]</li> [% end %] ! ## Ruby Erubis::Eruby.new(str, :pattern=>'[% %]') ## command-line $ erubis -p '[% %]' ﬁle.eruby copyright(c) 2009 kuwata-lab.com all rights reserved. 8

Binding Hash Object Hash Object hash = { @title = "Example" :title => "Example", @items = [1, 2, 3] :items => [1, 2, 3], } erubis = erubis = Erubis::Eruby.new(str) Erubis::Eruby.new(str) puts erubis.evaluate(self) puts erubis.result(hash) <h1><%= title%></h1> <h1><%= @title%></h1> <% for x in items %> <% for x in @items %> <% end %> <% end %> copyright(c) 2009 kuwata-lab.com all rights reserved. 9

Enhancer ‣ Erubis module ## <%= %> HTML module EscapeEnhancer def add_expr(src, code, indicator) if indicator == '=' src << " _buf<<escapeXml(#{code})" elsif indicator == '==' src << " _buf<<(#{code}).to_s;" end end Erubis end copyright(c) 2009 kuwata-lab.com all rights reserved. 10

Enhancer (cont') ### Enhancer ### ( : print() ) module StdoutEnhancer _buf="" def add_preamble(src) _buf=$stdout src << "_buf = $stdout;" end def add_postamble(src) src << "n""n" end _buf.to_s end "" ( ) copyright(c) 2009 kuwata-lab.com all rights reserved. 11

Enhancer include/extend ### Ruby class MyEruby < Erubis::Eruby include Erubis::EscapeEnhancer include Erubis::PercentLineEnhancer end puts MyEruby.new(str).result(:items=>[1,2,3]) , ### command-line $ erubis -E Escape,Percent ﬁle.eruby copyright(c) 2009 kuwata-lab.com all rights reserved. 12

Enhancer ‣ EscapeEnhancer : HTML ‣ PercentLineEnhancer : '%' ‣ InterporationEnhancer : _buf<<"#{ }" ‣ DeleteIndentEnhancer : HTML ‣ StdoutEnhancer : _buf="" _buf=$stdout ‣ ... (erubis -h ) copyright(c) 2009 kuwata-lab.com all rights reserved. 13

‣ ( ) ### command-line $ erubis -c '{arr: [A, B, C]}' template.eruby # YAML $ erubis -c '@arr=%w[A B C]' template.eruby # Ruby <% for x in @arr %> <li>A</li> <li><%= x %></li> <li>B</li> <% end %> <li>C</li> copyright(c) 2009 kuwata-lab.com all rights reserved. 14

‣ *.yaml *.rb $ erubis -f data.yaml template.eruby # YAML $ erubis -f data.rb template.eruby # Ruby data.yaml data.rb title: Example @title = "Example" items: @items = - name: Foo [ {"name"=>"Foo"}, - name: Bar {"name"=>"Bar"}, ] copyright(c) 2009 kuwata-lab.com all rights reserved. 15

‣ PHP, Java, JS, C, Perl,Scheme ( ) <% for (i=0; i<n; i++) { %> (C ) <li><%= "%d", i %> printf() <% } %> #line 1 "ﬁle.ec" (erubis -xl c ﬁle.ec ) for (i=0; i<n; i++) { fputs("<li>", stdout); fprintf(stdout, "%d", i); fputs("n", stdout); } copyright(c) 2009 kuwata-lab.com all rights reserved. 17

‣ binding() • i=0 ### ﬁle.erb str = File.read('ﬁle.erb') <% for i in 1..3 %> ERB.new(str).result(binding) <li><%= i %></li> p i #=> 3 <% end %> ! copyright(c) 2009 kuwata-lab.com all rights reserved. 20

ERB ‣( ) ‣ Struct • http://d.hatena.ne.jp/m_seki/20080528/1211909590 Foo = Struct.new(:title, :items) class Foo def env; binding(); end end ctx = Foo.new("Example", [1,2,3]) ERB.new(str).result(ctx.env) copyright(c) 2009 kuwata-lab.com all rights reserved. 22

Erubis ‣ Binding Hash erubis.result(:items=>[1, 2, 3]) def result(b=TOPLEVEL_BINDING) if b.is_a?(Hash) s = b.collect{|k,v| "#{k}=b[#{k.inspect}];"}.join b = binding() eval s, b Binding end return eval(@src, b) end copyright(c) 2009 kuwata-lab.com all rights reserved. 23

Erubis ‣ Binding Object @items = [1, 2, 3]; <% for x in @items %> erubis.evaluate(self) <% end %> def evaluate(ctx) Hash if ctx.is_a?(Hash) hash = ctx; ctx = Object.new hash.each {|k,v| ctx.instance_variable_set("@#{k}", v) } end return ctx.instance_eval(@src) end copyright(c) 2009 kuwata-lab.com all rights reserved. 24

Erubis ‣ Erubis • eruby = Erubis::Eruby.new(str, :escape=>true) # or eruby = Erubis::EscapedEruby.new(str) puts eruby.evaluate(ctx) Hi <%= @name %>! # Hi <%== @name %>! # copyright(c) 2009 kuwata-lab.com all rights reserved. 36

<% unless @items.blank? %> <table> <tbody> <% @items.each do |item| %> <tr class="item" id="item-<%=item.id%>"> <td class="item-id"><%= item.id %></td> <td class="item-name"> <% if item.url && !item.url.empty? %> <a href="<%= item.url %>"><%=item.name%></a> <% else %> <span><%=item.name%></span> <% end %> </td> </tr> HTML Ruby <% end %> </tbody> end </table> (do end 100 ) <% end %> copyright(c) 2009 kuwata-lab.com all rights reserved. 37

ERB ‣ ( erb -x ) $ erb -x foo.eruby _erbout = ''; unless @items.blank? ; _erbout.concat "n" _erbout.concat "<table>n" _erbout.concat " <tr class="record">n" $ erb -x foo.eruby | ruby -wc Syntax OK copyright(c) 2009 kuwata-lab.com all rights reserved. 38

$ cat foo.eruby <% unless @items.blank? %> <table> <% @items.each_with_index do|x, i| %> <tr class="record"> <td><%= i +1 %></td> <td><%=h x %></td> </tr> <% end %> </table> <% end %> copyright(c) 2009 kuwata-lab.com all rights reserved. 40

-x Ruby $ erubis -x foo.eruby _buf = ''; unless @items.blank? _buf << '<table> '; @items.each_with_index do|x, i| _buf << ' <tr class="record"> <td>'; _buf << ( i +1 ).to_s; _buf << '</td> <td>'; _buf << (h x ).to_s; _buf << '</td> </tr> '; end _buf << '</table> '; end _buf.to_s copyright(c) 2009 kuwata-lab.com all rights reserved. 41

-X $ erubis -X foo.eruby _buf = ''; unless @items.blank? @items.each_with_index do|x, i| _buf << ( i +1 ).to_s; _buf << (h x ).to_s; end end _buf.to_s copyright(c) 2009 kuwata-lab.com all rights reserved. 42

-N (number) $ erubis -XN foo.eruby 1: _buf = ''; unless @items.blank? 2: 3: @items.each_with_index do|x, i| 4: 5: _buf << ( i +1 ).to_s; 6: _buf << (h x ).to_s; 7: 8: end 9: 10: end 11: _buf.to_s copyright(c) 2009 kuwata-lab.com all rights reserved. 43

-U (uniq) $ erubis -XNU foo.eruby 1: _buf = ''; unless @items.blank? 3: @items.each_with_index do|x, i| 5: _buf << ( i +1 ).to_s; 6: _buf << (h x ).to_s; 8: end 10: end 11: _buf.to_s copyright(c) 2009 kuwata-lab.com all rights reserved. 44

-C (compact) $ erubis -XNC foo.eruby 1: _buf = ''; unless @items.blank? 3: @items.each_with_index do|x, i| 5: _buf << ( i +1 ).to_s; 6: _buf << (h x ).to_s; 8: end 10: end 11: _buf.to_s copyright(c) 2009 kuwata-lab.com all rights reserved. 45

‣ HTML • <html> <html> <body> <body> !( ) </body> <h1><%=@title%></h1> </html> <ul id="menulist"> <% for x in @items %> <h1><%=@title%></h1> <li><%=x%></li> <ul id="menulist"> </ul> <% end %> </ul> <% for x in @items %> </body> <li><%= x %></li> </html> <% end %> copyright(c) 2009 kuwata-lab.com all rights reserved. 56

‣ • http://jp.rubyist.net/magazine/?0024-TemplateSystem ‣ • http://jp.rubyist.net/magazine/?0024-TemplateSystem2 ‣ Erubis • http://www.kuwata-lab.com/erubis/ ‣ • http://www.kuwata-lab.com/tenjin/ copyright(c) 2009 kuwata-lab.com all rights reserved. 61

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Erubis徹底解説

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Erubis徹底解説 — Presentation Transcript