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テンプレートの静的解析とリファクタリング
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aereal
October 17, 2014
Programming
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テンプレートの静的解析とリファクタリング
Talk at テンプレートエンジン Night
aereal
October 17, 2014
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Transcript
ςϯϓϨʔτͷ! ੩తղੳͱ! ϦϑΝΫλϦϯά! ! id:aereal
ࣗݾհ • id:aereal • aereal.org • Hatena • Web
ΞδΣϯμ •Web ΞϓϦέʔγϣϯͱςϯϓϨʔτ Τϯδϯ •Text::Xslate ͱ੩తղੳ •՝ͱల
ςϯϓϨʔτΤϯδϯ •Template::Toolkit •Text::MicroMason •HTML::Template • Text::Xslate
Web ΞϓϦέʔγϣϯ ͱςϯϓϨʔτΤϯδϯ
ߘΛදࣔ͢Δ! ૉͳςϯϓϨʔτ
post.tt <h1>[% post.title %]</h1> <div class="body">[% post.body %]</div>
ίϯτϩʔϥ $c->render('post.tt', { post => $post });
ʮߘΛҰཡදࣔ͠Α͏ʯ
•ςϯϓϨʔτΛϞδϡʔϧԽ •post.tt → _post.tt •posts/index.tt → _post.tt •posts/show.tt → _post.tt
ʮҰཡͰຊจΛ! লུ͍ͨ͠ʯ
_post.tt [%- SET formatted = with_ellipsis ? (post.body | truncate)
: post.body %] <h1>[% post.title %]</h1> <div class="body">[% formatted %]</div>
िؒޙ……
index.tt [% INCLUDE "_post.tt" WITH with_ellipsis = 1, show_social_buttons =
1, ... ... show_category = 1, %]
INCLUDE ͢Δͱ͖ʹ! ԿΛͤΑ͍ͷ͔! Θ͔Βͳ͍
ʮίϝϯτʹॻ͜͏ʯ
_post.tt [%# post, show_social_buttons, show_category, ... %] ...
ॿ͔ͬͨ
࣌ྲྀΕͨɺ͋Δ
ίϝϯτ่յ •_post.tt Ͱ blog ͕ඞཁʹͳͬͨ •index.tt Ͱ blog ͕ఆٛࡁΈͩͬͨ •_post.tt
ʹίϝϯτ͕ه͞Εͳ͔ͬͨ
_post.tt <div class="post" data-blog-id="[% blog.id %]"> ... </div>
index.tt [%# blog %] ... [% FOR post IN posts
%] [% INCLUDE "_post.tt" WITH blog = blog, ... %] [% END %]
͏μϝͩ
ͦΕ੩తղੳͰ
ͳͥ੩తղੳ •نଇ͕͋ΔͷͰϓϩάϥϜͷಘҙ •Text::Xslate ʹϦονͳ API ͕͋Δ
ొਓ •Text::Xslate::Parser •(Text::Xslate::Syntax::*) •Text::Xslate::Symbol •Text::Xslate::AST::Walker ˑ
Text::Xslate::Parser •࣮ࡍʹ͏ͷαϒΫϥε •e.g. Text::Xslate::Syntax::TTerse •Text::Xslate::Parser#parse •AST ͕ಘΒΕΔ •AST = [
Text::Xslate::Symbol ]
T::X::Parser my $template = "my name is [% name %]";
my $parser = Text::Xslate::Syntax::TTerse->new; my $ast = $parser->parse($template);
Text::Xslate::Symbol •#arity •ࣜͷछྨ(?) •e.g. print, literal
Text::Xslate::Symbol •#id •ࣝผࢠ •e.g. name
Text::Xslate::Symbol •#first #second •Φϖϥϯυ͕ฦΔ •#is_value ͳͲ
มͰ͋ΔτʔΫϯ grep { $_->arity eq 'variable' } @$ast
͏ͪΐͬͱஸೡʹ •ߏͳͷͰ࠶ؼతʹ୳͞ͳ͍ͱ͍͚ͳ ͍ •#first #second
Text::Xslate::AST::Walker https://github.com/aereal/Text-Xslate-AST-Walker
ະఆٛͷม͕ͳ͍ ͜ͱΛظ͢ΔσϞ
՝ •INCLUDE ͢Δ࣌ʹ͢ύϥϝʔλͷ໊લະ ఆٛʹݟ͑ͯ͠·͏ •અ͕ೖ (assign) ͩͬͨΒεΩοϓ͢ΕΑ ͦ͞͏ •#traverse Έ͍ͨͳϝιουΛ࣮͍ͯ͠·
͢ •(inspired by Path::Class::Dir#traverse)
ύϥϝʔλͷ໊લ [% INCLUDE "..." WITH post = post %] ~~~~
՝ •ϦϑΝΫλϦϯάࣗಈԽ͍ͨ͠ •→ நతͰͳ͍ߏจ͕ཉ͍͠