# = ERB -- Ruby Templating

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#

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# Author:: Masatoshi SEKI

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# Documentation:: James Edward Gray II and Gavin Sinclair

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#

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# See ERB for primary documentation and ERB::Util for a couple of utility

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# routines.

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#

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# Copyright (c) 1999-2000,2002,2003 Masatoshi SEKI

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#

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# You can redistribute it and/or modify it under the same terms as Ruby.

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#

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# = ERB -- Ruby Templating

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#

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# == Introduction

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#

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# ERB provides an easy to use but powerful templating system for Ruby. Using

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# ERB, actual Ruby code can be added to any plain text document for the

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# purposes of generating document information details and/or flow control.

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#

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# A very simple example is this:

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#

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# require 'erb'

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#

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# x = 42

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# template = ERB.new <<-EOF

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# The value of x is: <%= x %>

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# EOF

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# puts template.result(binding)

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#

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# <em>Prints:</em> The value of x is: 42

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#

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# More complex examples are given below.

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#

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#

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# == Recognized Tags

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#

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# ERB recognizes certain tags in the provided template and converts them based

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# on the rules below:

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#

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# <% Ruby code -- inline with output %>

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# <%= Ruby expression -- replace with result %>

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# <%# comment -- ignored -- useful in testing %>

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# % a line of Ruby code -- treated as <% line %> (optional -- see ERB.new)

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# %% replaced with % if first thing on a line and % processing is used

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# <%% or %%> -- replace with <% or %> respectively

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#

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# All other text is passed through ERB filtering unchanged.

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#

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#

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# == Options

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#

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# There are several settings you can change when you use ERB:

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# * the nature of the tags that are recognized;

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# * the value of <tt>$SAFE</tt> under which the template is run;

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# * the binding used to resolve local variables in the template.

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#

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# See the ERB.new and ERB#result methods for more detail.

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#

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#

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# == Examples

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#

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# === Plain Text

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#

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# ERB is useful for any generic templating situation. Note that in this example, we use the

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# convenient "% at start of line" tag, and we quote the template literally with

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# <tt>%q{...}</tt> to avoid trouble with the backslash.

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#

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# require "erb"

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#

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# # Create template.

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# template = %q{

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# From: James Edward Gray II <james@grayproductions.net>

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# To: <%= to %>

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# Subject: Addressing Needs

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#

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# <%= to[/\w+/] %>:

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#

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# Just wanted to send a quick note assuring that your needs are being

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# addressed.

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#

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# I want you to know that my team will keep working on the issues,

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# especially:

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#

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# <%# ignore numerous minor requests -- focus on priorities %>

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# % priorities.each do |priority|

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# * <%= priority %>

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# % end

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#

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# Thanks for your patience.

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#

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# James Edward Gray II

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# }.gsub(/^ /, '')

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#

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# message = ERB.new(template, 0, "%<>")

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#

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# # Set up template data.

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# to = "Community Spokesman <spokesman@ruby_community.org>"

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# priorities = [ "Run Ruby Quiz",

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# "Document Modules",

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# "Answer Questions on Ruby Talk" ]

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#

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# # Produce result.

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# email = message.result

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# puts email

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#

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# <i>Generates:</i>

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#

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# From: James Edward Gray II <james@grayproductions.net>

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# To: Community Spokesman <spokesman@ruby_community.org>

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# Subject: Addressing Needs

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#

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# Community:

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#

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# Just wanted to send a quick note assuring that your needs are being addressed.

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#

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# I want you to know that my team will keep working on the issues, especially:

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#

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# * Run Ruby Quiz

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# * Document Modules

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# * Answer Questions on Ruby Talk

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#

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# Thanks for your patience.

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#

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# James Edward Gray II

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#

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# === Ruby in HTML

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#

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# ERB is often used in <tt>.rhtml</tt> files (HTML with embedded Ruby). Notice the need in

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# this example to provide a special binding when the template is run, so that the instance

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# variables in the Product object can be resolved.

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#

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# require "erb"

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#

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# # Build template data class.

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# class Product

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# def initialize( code, name, desc, cost )

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# @code = code

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# @name = name

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# @desc = desc

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# @cost = cost

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#

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# @features = [ ]

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# end

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#

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# def add_feature( feature )

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# @features << feature

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# end

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#

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# # Support templating of member data.

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# def get_binding

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# binding

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# end

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#

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# # ...

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# end

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#

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# # Create template.

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# template = %{

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# <html>

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# <head><title>Ruby Toys -- <%= @name %></title></head>

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# <body>

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#

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# <h1><%= @name %> (<%= @code %>)</h1>

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# <p><%= @desc %></p>

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#

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# <ul>

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# <% @features.each do |f| %>

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# <li><b><%= f %></b></li>

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# <% end %>

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# </ul>

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#

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# <p>

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# <% if @cost < 10 %>

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# <b>Only <%= @cost %>!!!</b>

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# <% else %>

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# Call for a price, today!

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# <% end %>

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# </p>

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#

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# </body>

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# </html>

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# }.gsub(/^ /, '')

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#

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# rhtml = ERB.new(template)

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#

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# # Set up template data.

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# toy = Product.new( "TZ-1002",

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# "Rubysapien",

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# "Geek's Best Friend! Responds to Ruby commands...",

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# 999.95 )

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# toy.add_feature("Listens for verbal commands in the Ruby language!")

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# toy.add_feature("Ignores Perl, Java, and all C variants.")

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# toy.add_feature("Karate-Chop Action!!!")

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# toy.add_feature("Matz signature on left leg.")

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# toy.add_feature("Gem studded eyes... Rubies, of course!")

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#

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# # Produce result.

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# rhtml.run(toy.get_binding)

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#

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# <i>Generates (some blank lines removed):</i>

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#

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# <html>

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# <head><title>Ruby Toys -- Rubysapien</title></head>

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# <body>

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#

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# <h1>Rubysapien (TZ-1002)</h1>

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# <p>Geek's Best Friend! Responds to Ruby commands...</p>

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#

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# <ul>

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# <li><b>Listens for verbal commands in the Ruby language!</b></li>

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# <li><b>Ignores Perl, Java, and all C variants.</b></li>

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# <li><b>Karate-Chop Action!!!</b></li>

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# <li><b>Matz signature on left leg.</b></li>

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# <li><b>Gem studded eyes... Rubies, of course!</b></li>

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# </ul>

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#

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# <p>

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# Call for a price, today!

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# </p>

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#

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# </body>

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# </html>

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#

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#

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# == Notes

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#

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# There are a variety of templating solutions available in various Ruby projects:

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# * ERB's big brother, eRuby, works the same but is written in C for speed;

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# * Amrita (smart at producing HTML/XML);

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# * cs/Template (written in C for speed);

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# * RDoc, distributed with Ruby, uses its own template engine, which can be reused elsewhere;

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# * and others; search the RAA.

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#

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# Rails, the web application framework, uses ERB to create views.

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#

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class ERB

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Revision = '$Date: 2009-02-24 02:44:50 +0900 (Tue, 24 Feb 2009) $' #'

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# Returns revision information for the erb.rb module.

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def self.version

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"erb.rb [2.1.0 #{ERB::Revision.split[1]}]"

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end

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end

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#--

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# ERB::Compiler

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class ERB

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class Compiler # :nodoc:

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class PercentLine # :nodoc:

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def initialize(str)

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@value = str

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end

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attr_reader :value

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alias :to_s :value

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def empty?

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@value.empty?

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end

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end

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class Scanner # :nodoc:

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@scanner_map = {}

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def self.regist_scanner(klass, trim_mode, percent)

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@scanner_map[[trim_mode, percent]] = klass

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end

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def self.default_scanner=(klass)

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@default_scanner = klass

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end

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def self.make_scanner(src, trim_mode, percent)

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klass = @scanner_map.fetch([trim_mode, percent], @default_scanner)

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klass.new(src, trim_mode, percent)

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end

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def initialize(src, trim_mode, percent)

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@src = src

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@stag = nil

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end

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attr_accessor :stag

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def scan; end

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end

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class TrimScanner < Scanner # :nodoc:

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def initialize(src, trim_mode, percent)

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super

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@trim_mode = trim_mode

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@percent = percent

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if @trim_mode == '>'

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@scan_line = self.method(:trim_line1)

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elsif @trim_mode == '<>'

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@scan_line = self.method(:trim_line2)

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elsif @trim_mode == '-'

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@scan_line = self.method(:explicit_trim_line)

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else

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@scan_line = self.method(:scan_line)

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end

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end

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attr_accessor :stag

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def scan(&block)

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@stag = nil

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if @percent

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@src.each do |line|

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percent_line(line, &block)

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end

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else

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@scan_line.call(@src, &block)

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end

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nil

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end

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def percent_line(line, &block)

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if @stag || line[0] != ?%

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return @scan_line.call(line, &block)

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end

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line[0] = ''

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if line[0] == ?%

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@scan_line.call(line, &block)

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else

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yield(PercentLine.new(line.chomp))

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end

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end

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def scan_line(line)

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line.scan(/(.*?)(<%%|%%>|<%=|<%#|<%|%>|\n|\z)/m) do |tokens|

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tokens.each do |token|

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next if token.empty?

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yield(token)

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end

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end

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end

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def trim_line1(line)

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line.scan(/(.*?)(<%%|%%>|<%=|<%#|<%|%>\n|%>|\n|\z)/m) do |tokens|

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tokens.each do |token|

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next if token.empty?

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if token == "%>\n"

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yield('%>')

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yield(:cr)

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else

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yield(token)

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end

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end

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end

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end

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def trim_line2(line)

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head = nil

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line.scan(/(.*?)(<%%|%%>|<%=|<%#|<%|%>\n|%>|\n|\z)/m) do |tokens|

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tokens.each do |token|

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next if token.empty?

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head = token unless head

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if token == "%>\n"

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yield('%>')

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if is_erb_stag?(head)

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yield(:cr)

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else

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yield("\n")

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end

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head = nil

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else

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yield(token)

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head = nil if token == "\n"

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end

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end

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end

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end

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def explicit_trim_line(line)

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line.scan(/(.*?)(^[ \t]*<%\-|<%\-|<%%|%%>|<%=|<%#|<%|-%>\n|-%>|%>|\z)/m) do |tokens|

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tokens.each do |token|

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next if token.empty?

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if @stag.nil? && /[ \t]*<%-/ =~ token

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yield('<%')

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elsif @stag && token == "-%>\n"

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yield('%>')

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yield(:cr)

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elsif @stag && token == '-%>'

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yield('%>')

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else

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yield(token)

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end

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end

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end

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end

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ERB_STAG = %w(<%= <%# <%)

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def is_erb_stag?(s)

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ERB_STAG.member?(s)

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end

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end

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Scanner.default_scanner = TrimScanner

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class SimpleScanner < Scanner # :nodoc:

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def scan

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@src.scan(/(.*?)(<%%|%%>|<%=|<%#|<%|%>|\n|\z)/m) do |tokens|

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tokens.each do |token|

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next if token.empty?

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yield(token)

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end

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end

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end

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end

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Scanner.regist_scanner(SimpleScanner, nil, false)

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begin

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require 'strscan'

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class SimpleScanner2 < Scanner # :nodoc:

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def scan

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stag_reg = /(.*?)(<%%|<%=|<%#|<%|\z)/m

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etag_reg = /(.*?)(%%>|%>|\z)/m

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scanner = StringScanner.new(@src)

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while ! scanner.eos?

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scanner.scan(@stag ? etag_reg : stag_reg)

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yield(scanner[1])

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yield(scanner[2])

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end

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end

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end

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Scanner.regist_scanner(SimpleScanner2, nil, false)

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class ExplicitScanner < Scanner # :nodoc:

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def scan

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stag_reg = /(.*?)(^[ \t]*<%-|<%%|<%=|<%#|<%-|<%|\z)/m

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etag_reg = /(.*?)(%%>|-%>|%>|\z)/m

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scanner = StringScanner.new(@src)

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while ! scanner.eos?

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scanner.scan(@stag ? etag_reg : stag_reg)

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yield(scanner[1])

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elem = scanner[2]

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if /[ \t]*<%-/ =~ elem

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yield('<%')

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elsif elem == '-%>'

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yield('%>')

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yield(:cr) if scanner.scan(/(\n|\z)/)

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else

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yield(elem)

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end

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end

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end

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end

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Scanner.regist_scanner(ExplicitScanner, '-', false)

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rescue LoadError

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end

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class Buffer # :nodoc:

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def initialize(compiler)

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@compiler = compiler

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@line = []

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@script = ""

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@compiler.pre_cmd.each do |x|

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push(x)

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end

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end

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attr_reader :script

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def push(cmd)

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@line << cmd

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end

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def cr

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@script << (@line.join('; '))

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@line = []

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@script << "\n"

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end

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def close

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return unless @line

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@compiler.post_cmd.each do |x|

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push(x)

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end

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@script << (@line.join('; '))

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@line = nil

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end

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end

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def content_dump(s)

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n = s.count("\n")

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if n > 0

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s.dump + "\n" * n

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else

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s.dump

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end

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end

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def compile(s)

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out = Buffer.new(self)

[495] Fix | Delete

[496] Fix | Delete

content = ''

[497] Fix | Delete

scanner = make_scanner(s)

[498] Fix | Delete

scanner.scan do |token|

[499] Fix | Delete