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U:RDoc::NormalClass[iI"ERB:ET@I" Object;To:RDoc::Markup::Document: @parts[ o;;[=S:RDoc::Markup::Heading: leveli: textI"ERB -- Ruby Templating;To: RDoc::Markup::BlankLine S; ; i; I"Introduction;T@o: RDoc::Markup::Paragraph;[I"QERB provides an easy to use but powerful templating system for Ruby. Using ;TI"KERB, actual Ruby code can be added to any plain text document for the ;TI"Mpurposes of generating document information details and/or flow control.;T@o; ;[I"#A very simple example is this:;T@o:RDoc::Markup::Verbatim;[ I"require 'erb' ;TI" ;TI" x = 42 ;TI" template = ERB.new <<-EOF ;TI"# The value of x is: <%= x %> ;TI" EOF ;TI"#puts template.result(binding) ;T: @format0o; ;[I"+<em>Prints:</em> The value of x is: 42;T@o; ;[I"+More complex examples are given below.;T@S; ; i; I"Recognized Tags;T@o; ;[I"RERB recognizes certain tags in the provided template and converts them based ;TI"on the rules below:;T@o;;[ I"+<% Ruby code -- inline with output %> ;TI"3<%= Ruby expression -- replace with result %> ;TI"4<%# comment -- ignored -- useful in testing %> ;TI"N% a line of Ruby code -- treated as <% line %> (optional -- see ERB.new) ;TI"J%% replaced with % if first thing on a line and % processing is used ;TI"6<%% or %%> -- replace with <% or %> respectively ;T;0o; ;[I">All other text is passed through ERB filtering unchanged.;T@S; ; i; I" Options;T@o; ;[I"@There are several settings you can change when you use ERB:;To:RDoc::Markup::List: @type: BULLET: @items[o:RDoc::Markup::ListItem: @label0;[o; ;[I"0the nature of the tags that are recognized;;To;;0;[o; ;[I"Athe binding used to resolve local variables in the template.;T@o; ;[I"<See the ERB.new and ERB#result methods for more detail.;T@S; ; i; I"Character encodings;T@o; ;[ I"FERB (or Ruby code generated by ERB) returns a string in the same ;TI"Hcharacter encoding as the input string. When the input string has ;TI"Ma magic comment, however, it returns a string in the encoding specified ;TI"by the magic comment.;T@o;;[ I" # -*- coding: utf-8 -*- ;TI"require 'erb' ;TI" ;TI" template = ERB.new <<EOF ;TI" <%#-*- coding: Big5 -*-%> ;TI"4 \_\_ENCODING\_\_ is <%= \_\_ENCODING\_\_ %>. ;TI" EOF ;TI"puts template.result ;T;0o; ;[I"/<em>Prints:</em> \_\_ENCODING\_\_ is Big5.;T@S; ; i; I" Examples;T@S; ; i; I"Plain Text;T@o; ;[I"`ERB is useful for any generic templating situation. Note that in this example, we use the ;TI"Sconvenient "% at start of line" tag, and we quote the template literally with ;TI":<tt>%q{...}</tt> to avoid trouble with the backslash.;T@o;;[*I"require "erb" ;TI" ;TI"# Create template. ;TI"template = %q{ ;TI"? From: James Edward Gray II <james@grayproductions.net> ;TI" To: <%= to %> ;TI"" Subject: Addressing Needs ;TI" ;TI" <%= to[/\w+/] %>: ;TI" ;TI"K Just wanted to send a quick note assuring that your needs are being ;TI" addressed. ;TI" ;TI"H I want you to know that my team will keep working on the issues, ;TI" especially: ;TI" ;TI"D <%# ignore numerous minor requests -- focus on priorities %> ;TI"' % priorities.each do |priority| ;TI" * <%= priority %> ;TI" % end ;TI" ;TI"! Thanks for your patience. ;TI" ;TI" James Edward Gray II ;TI"}.gsub(/^ /, '') ;TI" ;TI"3message = ERB.new(template, trim_mode: "%<>") ;TI" ;TI" # Set up template data. ;TI"?to = "Community Spokesman <spokesman@ruby_community.org>" ;TI"%priorities = [ "Run Ruby Quiz", ;TI"( "Document Modules", ;TI"6 "Answer Questions on Ruby Talk" ] ;TI" ;TI"# Produce result. ;TI" email = message.result ;TI"puts email ;T;0o; ;[I"<i>Generates:</i>;T@o;;[I"=From: James Edward Gray II <james@grayproductions.net> ;TI"=To: Community Spokesman <spokesman@ruby_community.org> ;TI" Subject: Addressing Needs ;TI" ;TI"Community: ;TI" ;TI"TJust wanted to send a quick note assuring that your needs are being addressed. ;TI" ;TI"RI want you to know that my team will keep working on the issues, especially: ;TI" ;TI" * Run Ruby Quiz ;TI" * Document Modules ;TI") * Answer Questions on Ruby Talk ;TI" ;TI" Thanks for your patience. ;TI" ;TI"James Edward Gray II ;T;0S; ; i; I"Ruby in HTML;T@o; ;[I"_ERB is often used in <tt>.rhtml</tt> files (HTML with embedded Ruby). Notice the need in ;TI"^this example to provide a special binding when the template is run, so that the instance ;TI"5variables in the Product object can be resolved.;T@o;;[HI"require "erb" ;TI" ;TI""# Build template data class. ;TI"class Product ;TI"0 def initialize( code, name, desc, cost ) ;TI" @code = code ;TI" @name = name ;TI" @desc = desc ;TI" @cost = cost ;TI" ;TI" @features = [ ] ;TI" end ;TI" ;TI"" def add_feature( feature ) ;TI" @features << feature ;TI" end ;TI" ;TI", # Support templating of member data. ;TI" def get_binding ;TI" binding ;TI" end ;TI" ;TI" # ... ;TI" end ;TI" ;TI"# Create template. ;TI"template = %{ ;TI" <html> ;TI"? <head><title>Ruby Toys -- <%= @name %></title></head> ;TI" <body> ;TI" ;TI"0 <h1><%= @name %> (<%= @code %>)</h1> ;TI" <p><%= @desc %></p> ;TI" ;TI" <ul> ;TI") <% @features.each do |f| %> ;TI"( <li><b><%= f %></b></li> ;TI" <% end %> ;TI" </ul> ;TI" ;TI" <p> ;TI"! <% if @cost < 10 %> ;TI"+ <b>Only <%= @cost %>!!!</b> ;TI" <% else %> ;TI") Call for a price, today! ;TI" <% end %> ;TI" </p> ;TI" ;TI" </body> ;TI" </html> ;TI"}.gsub(/^ /, '') ;TI" ;TI" rhtml = ERB.new(template) ;TI" ;TI" # Set up template data. ;TI"#toy = Product.new( "TZ-1002", ;TI"& "Rubysapien", ;TI"M "Geek's Best Friend! Responds to Ruby commands...", ;TI"! 999.95 ) ;TI"Jtoy.add_feature("Listens for verbal commands in the Ruby language!") ;TI"@toy.add_feature("Ignores Perl, Java, and all C variants.") ;TI".toy.add_feature("Karate-Chop Action!!!") ;TI"4toy.add_feature("Matz signature on left leg.") ;TI"?toy.add_feature("Gem studded eyes... Rubies, of course!") ;TI" ;TI"# Produce result. ;TI" rhtml.run(toy.get_binding) ;T;0o; ;[I"1<i>Generates (some blank lines removed):</i>;T@o;;[I" <html> ;TI"; <head><title>Ruby Toys -- Rubysapien</title></head> ;TI" <body> ;TI" ;TI"' <h1>Rubysapien (TZ-1002)</h1> ;TI"B <p>Geek's Best Friend! Responds to Ruby commands...</p> ;TI" ;TI" <ul> ;TI"O <li><b>Listens for verbal commands in the Ruby language!</b></li> ;TI"E <li><b>Ignores Perl, Java, and all C variants.</b></li> ;TI"3 <li><b>Karate-Chop Action!!!</b></li> ;TI"9 <li><b>Matz signature on left leg.</b></li> ;TI"D <li><b>Gem studded eyes... Rubies, of course!</b></li> ;TI" </ul> ;TI" ;TI" <p> ;TI"' Call for a price, today! ;TI" </p> ;TI" ;TI" </body> ;TI" </html> ;T;0S; ; i; I" Notes;T@o; ;[I"UThere are a variety of templating solutions available in various Ruby projects. ;TI"SFor example, RDoc, distributed with Ruby, uses its own template engine, which ;TI" can be reused elsewhere.;T@o; ;[I"?Other popular engines could be found in the corresponding ;TI"M{Category}[https://www.ruby-toolbox.com/categories/template_engines] of ;TI"The Ruby Toolbox.;T: @fileI"lib/erb.rb;T:0@omit_headings_from_table_of_contents_below0o;;[ ;@;0o;;[ ;@;0o;;[ ;@;0o;;[ ;@;0;0;0[ [ I" encoding;TI"R;T: publicFI"lib/erb.rb;T[ I" filename;TI"RW;T;F@#[ I" lineno;T@&;F@#[ I"src;T@";F@#[U:RDoc::Constant[i I"NOT_GIVEN;TI"ERB::NOT_GIVEN;T: private0o;;[ ;@;0@@cRDoc::NormalClass0U;[i I"ZERO_SAFE_LEVELS;TI"ERB::ZERO_SAFE_LEVELS;T;0o;;[ ;@;0@@@20[ [[I" class;T[[;[[I"new;T@#[I" version;T@#[:protected[ [;[ [I" instance;T[[;[[I"def_class;T@#[I"def_method;T@#[I"def_module;T@#[I"location=;T@#[I"make_compiler;T@#[I" result;T@#[I"result_with_hash;T@#[I"run;T@#[I"set_eoutvar;T@#[;[ [;[[I"new_toplevel;T@#[ [U:RDoc::Context::Section[i 0o;;[ ;0;0[@@cRDoc::TopLevel