Erubis徹底解説

RubyKaigi2009

Erubis

makoto kuwata <kwa@kuwata-lab.com>
http://www.kuwata-lab.com/

copyright(c) 2009 kuwata-lab.com all rights reserved.
1

‣

‣

2

Agenda

‣ Part 1. Erubis
‣ Part 2. eRuby
‣ Part 3.

3

Part 1. Erubis

4

Erubis

‣ pure Ruby eRuby
‣
• http://jp.rubyist.net/magazine/?0022-FasterThanC
‣
• HTML
•
• PHP, Java, JS, C, Perl, Scheme
• ...
5

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 #

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)

7

‣ <% %> [% %]
[% for x in @list %]
<li>[%= x %]</li>
[% end %] !
## Ruby
Erubis::Eruby.new(str, :pattern=>'[% %]')
## command-line
$ erubis -p '[% %]' ﬁle.eruby

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 %>
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

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 "" ( )

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

12

Enhancer

‣ EscapeEnhancer : HTML

‣ PercentLineEnhancer : '%'

‣ InterporationEnhancer : _buf<<"#{ }"
‣ DeleteIndentEnhancer : HTML
‣ StdoutEnhancer : _buf="" _buf=$stdout

‣ ... (erubis -h )

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>

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"}, ]

15

‣ <%=== %>

<%=== @var %> 2

### Ruby
$stderr.puts("*** debug: @var=#{@var.inspect}")

###
*** debug: @var=["A", "B", "C"]

16

‣ 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); }

17

‣ Erubis
• HTML
•
• Enhancer
• /
•
• PHP, Java, JS, C, Perl, Scheme
18

Part 2. eRuby

19

‣ 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 %>
!

20

‣ binding()

•
•

b = Bingind.new
b[:title] = "Example" …
b[:items] = [1, 2, 3]

21

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)
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
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

ERB
1. 8.6 Erubis::Eruby

ERB
1. 8.7 Erubis::Eruby

ERB
1.9.1 Erubis::Eruby
0 10 20 30
(sec)

(by eval)
(eRuby→Ruby)
25

ERB

‣
‣
•
class Foo
extend ERB::DefMethod
def_erb_method('render', 'template.erb')
end
print Foo.new.render

26

Erubis

‣
• Ruby *.cache
•2 *.cache

eruby = Erubis::Eruby.load_ﬁle("ﬁle.eruby")
print eruby.result()
CGI

27

Erubis

‣ Proc
•
•

instance_eval
def evaluate(ctx) Proc
@proc ||= eval(@src)
ctx.instance_eval(@proc)
end

28

‣
• HTML

<ul>
<ul>
<% for x in @list %> <li>AAA</li>
<li><%= x %></li>
<% end %> <li>BBB</li>
</ul>
</ul>
29

ERB

‣ trim mode
• ">" : "%>"
• "<>" : "<%" "%>"
• "-" : "<%-" "-%>"
• "%" : "%"
• "%>", "%<>", "-" : "%" ">"/"<>"/"-"

ERB.new(str, nil, "%<>")

30

Erubis

‣
• <% %>
• <%= %>

<ul> <ul>
<% for x in @list %> AAA
<%= x %> BBB
<% end %> CCC
</ul> </ul>

31

ERB Erubis
eRuby
× ( )
( )

×
( ) ( )

× ( )
( )

32

‣

• [ruby-list:18894] eRuby (?)

‣

• <% %> <%= %>
•

33

‣ <%= %> HTML
!
• eRuby HTML

•
‣ ?

34

ERB

‣( )
‣
•
String
• http://www2a.biglobe.ne.jp/~seki/ruby/erbquote.html

35

Erubis

‣ Erubis
•
eruby = Erubis::Eruby.new(str, :escape=>true)
# or eruby = Erubis::EscapedEruby.new(str)
puts eruby.evaluate(ctx)

Hi <%= @name %>! #
Hi <%== @name %>! #

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 %>

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
38

Erubis

‣
• -x : Ruby
• -X : HTML
• -N : (number)
• -U : 1 (unique)
• -C : (compact)
• -z :
39

$ 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 %>

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

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

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

43

-U (uniq)
$ erubis -XNU foo.eruby


5: _buf << ( i +1 ).to_s;
6: _buf << (h x ).to_s;

8: end

10: end
11: _buf.to_s

44

-C (compact)
$ erubis -XNC foo.eruby
5: _buf << ( i +1 ).to_s;
6: _buf << (h x ).to_s;
8: end
10: end
11: _buf.to_s

45

<%= %>

<%= form_for :user do %>
<div>
<%= text_ﬁeld :name %>
</div>
<% end %> eRuby

46

<%= %>

<%= 10.times do %>
Hello
<% end %>

!
_buf = "";
_buf << ( 10.times do ).to_s;
_buf << " Hellon";
end
47

ERB+Rails

‣ (_erbout)
!

form_for()
… _erbout

<% form_for do %> _erbout = ""
Hello form_for do
<% end %> _erbout.concat("Hello")
end

48

Erubis+Merb

‣ Erubis

<%= form_for do %> @_buf << (form_for do;
Hello @_buf << "Hellon"
<% end =%> end);

49

‣ eRuby
‣ (kool!)
‣
• @_buf

‣

50

‣ eRuby
eRuby
•
•
•
•
• HTML
•
•

51

Part 3.

52

‣
<ul> print "<ul>n"
<% for x in @a %> for x in @a
<li><%=x%></li> print "<li>#{x}</li>n"
<% end %> end
</ul> print "</u>n"

53

<ul> s = File.read('foo.eruby')
<li><%=x%></li> e = Erubis::Eruby.new(s)
</ul> puts e.evaluate(:x=>1)

54

‣ ?

<%#ARGS: items, name='guest' %>
Hello <%= name %>!
<% for x in items %>
<li><%=x%></li>
<% end %>

55

‣ 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 %>
56

‣ Django

....
{% block pagetitle %}
<h1>{{title}}</h1>
{% endblock %}
.... (method override)

57

AOP

‣ AOP : Aspect Oriented Programming
• /

<table>
"for x in @a" •HTML
<tr>
<td> "print x"
</tr> •
"end"
</table>
( )

58

‣ HTML View
• …

‣ HTML String
(http://www.oiwa.jp/~yutaka/tdiary/20051229.html)
• /
• Python str unicode
• HTML+String
• HTML (SQL )

59

‣
‣

• AOP …

‣

60

‣
• 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/

61

one more thing

62

Tenjin - template engine replacing eRuby

‣ ERB Erubis
• eRuby
•
‣ Tenjin :
• /
•
- ...
• http://www.kuwata-lab.com/tenjin/
63

thank you

64

Erubis徹底解説

Empfohlen

Empfohlen

Weitere ähnliche Inhalte

Was ist angesagt?

Was ist angesagt? (20)

Ähnlich wie Erubis徹底解説

Ähnlich wie Erubis徹底解説 (20)

Mehr von kwatch

Mehr von kwatch (20)

Kürzlich hochgeladen

Kürzlich hochgeladen (20)

Erubis徹底解説