зеркало из https://github.com/github/ruby.git
827 строки
20 KiB
Ruby
827 строки
20 KiB
Ruby
# = 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$' #'
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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 [2.0.4 #{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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end
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class Scanner # :nodoc:
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SplitRegexp = /(<%%)|(%%>)|(<%=)|(<%#)|(<%)|(%>)|(\n)/
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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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TrimSplitRegexp = /(<%%)|(%%>)|(<%=)|(<%#)|(<%)|(%>\n)|(%>)|(\n)/
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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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@src.each do |line|
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@scan_line.call(line, &block)
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end
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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.split(SplitRegexp).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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def trim_line1(line)
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line.split(TrimSplitRegexp).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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break
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end
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yield(token)
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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.split(TrimSplitRegexp).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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break
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end
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yield(token)
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end
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end
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ExplicitTrimRegexp = /(^[ \t]*<%-)|(-%>\n?\z)|(<%-)|(-%>)|(<%%)|(%%>)|(<%=)|(<%#)|(<%)|(%>)|(\n)/
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def explicit_trim_line(line)
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line.split(ExplicitTrimRegexp).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 && /-%>\n/ =~ token
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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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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.each do |line|
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line.split(SplitRegexp).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 = /(.*?)(<%%|<%=|<%#|<%|\n|\z)/
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etag_reg = /(.*?)(%%>|%>|\n|\z)/
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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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text = scanner[1]
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elem = scanner[2]
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yield(text) unless text.empty?
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yield(elem) unless elem.empty?
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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 PercentScanner < Scanner # :nodoc:
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def scan
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new_line = true
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stag_reg = /(.*?)(<%%|<%=|<%#|<%|\n|\z)/
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etag_reg = /(.*?)(%%>|%>|\n|\z)/
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scanner = StringScanner.new(@src)
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while ! scanner.eos?
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if new_line && @stag.nil?
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if scanner.scan(/%%/)
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yield('%')
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new_line = false
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next
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elsif scanner.scan(/%/)
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yield(PercentLine.new(scanner.scan(/.*?(\n|\z)/).chomp))
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next
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end
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end
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scanner.scan(@stag ? etag_reg : stag_reg)
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text = scanner[1]
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elem = scanner[2]
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yield(text) unless text.empty?
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yield(elem) unless elem.empty?
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new_line = (elem == "\n")
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end
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end
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end
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Scanner.regist_scanner(PercentScanner, nil, true)
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class ExplicitScanner < Scanner # :nodoc:
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def scan
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new_line = true
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stag_reg = /(.*?)(<%%|<%=|<%#|<%-|<%|\n|\z)/
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etag_reg = /(.*?)(%%>|-%>|%>|\n|\z)/
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scanner = StringScanner.new(@src)
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while ! scanner.eos?
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if new_line && @stag.nil? && scanner.scan(/[ \t]*<%-/)
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yield('<%')
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new_line = false
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next
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end
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scanner.scan(@stag ? etag_reg : stag_reg)
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text = scanner[1]
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elem = scanner[2]
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new_line = (elem == "\n")
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yield(text) unless text.empty?
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if elem == '-%>'
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yield('%>')
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if scanner.scan(/(\n|\z)/)
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yield(:cr)
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new_line = true
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end
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elsif elem == '<%-'
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yield('<%')
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else
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yield(elem) unless elem.empty?
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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 compile(s)
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out = Buffer.new(self)
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content = ''
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scanner = make_scanner(s)
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scanner.scan do |token|
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if scanner.stag.nil?
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case token
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when PercentLine
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out.push("#{@put_cmd} #{content.dump}") if content.size > 0
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content = ''
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out.push(token.to_s)
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out.cr
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when :cr
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out.cr
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when '<%', '<%=', '<%#'
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scanner.stag = token
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out.push("#{@put_cmd} #{content.dump}") if content.size > 0
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content = ''
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when "\n"
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content << "\n"
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out.push("#{@put_cmd} #{content.dump}")
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out.cr
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content = ''
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when '<%%'
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content << '<%'
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else
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content << token
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end
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else
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case token
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when '%>'
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case scanner.stag
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when '<%'
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if content[-1] == ?\n
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content.chop!
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out.push(content)
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out.cr
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else
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out.push(content)
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end
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when '<%='
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out.push("#{@insert_cmd}((#{content}).to_s)")
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|
when '<%#'
|
|
# out.push("# #{content.dump}")
|
|
end
|
|
scanner.stag = nil
|
|
content = ''
|
|
when '%%>'
|
|
content << '%>'
|
|
else
|
|
content << token
|
|
end
|
|
end
|
|
end
|
|
out.push("#{@put_cmd} #{content.dump}") if content.size > 0
|
|
out.close
|
|
out.script
|
|
end
|
|
|
|
def prepare_trim_mode(mode)
|
|
case mode
|
|
when 1
|
|
return [false, '>']
|
|
when 2
|
|
return [false, '<>']
|
|
when 0
|
|
return [false, nil]
|
|
when String
|
|
perc = mode.include?('%')
|
|
if mode.include?('-')
|
|
return [perc, '-']
|
|
elsif mode.include?('<>')
|
|
return [perc, '<>']
|
|
elsif mode.include?('>')
|
|
return [perc, '>']
|
|
else
|
|
[perc, nil]
|
|
end
|
|
else
|
|
return [false, nil]
|
|
end
|
|
end
|
|
|
|
def make_scanner(src)
|
|
Scanner.make_scanner(src, @trim_mode, @percent)
|
|
end
|
|
|
|
def initialize(trim_mode)
|
|
@percent, @trim_mode = prepare_trim_mode(trim_mode)
|
|
@put_cmd = 'print'
|
|
@insert_cmd = @put_cmd
|
|
@pre_cmd = []
|
|
@post_cmd = []
|
|
end
|
|
attr_reader :percent, :trim_mode
|
|
attr_accessor :put_cmd, :insert_cmd, :pre_cmd, :post_cmd
|
|
end
|
|
end
|
|
|
|
#--
|
|
# ERB
|
|
class ERB
|
|
#
|
|
# Constructs a new ERB object with the template specified in _str_.
|
|
#
|
|
# An ERB object works by building a chunk of Ruby code that will output
|
|
# the completed template when run. If _safe_level_ is set to a non-nil value,
|
|
# ERB code will be run in a separate thread with <b>$SAFE</b> set to the
|
|
# provided level.
|
|
#
|
|
# If _trim_mode_ is passed a String containing one or more of the following
|
|
# modifiers, ERB will adjust its code generation as listed:
|
|
#
|
|
# % enables Ruby code processing for lines beginning with %
|
|
# <> omit newline for lines starting with <% and ending in %>
|
|
# > omit newline for lines ending in %>
|
|
#
|
|
# _eoutvar_ can be used to set the name of the variable ERB will build up
|
|
# its output in. This is useful when you need to run multiple ERB
|
|
# templates through the same binding and/or when you want to control where
|
|
# output ends up. Pass the name of the variable to be used inside a String.
|
|
#
|
|
# === Example
|
|
#
|
|
# require "erb"
|
|
#
|
|
# # build data class
|
|
# class Listings
|
|
# PRODUCT = { :name => "Chicken Fried Steak",
|
|
# :desc => "A well messages pattie, breaded and fried.",
|
|
# :cost => 9.95 }
|
|
#
|
|
# attr_reader :product, :price
|
|
#
|
|
# def initialize( product = "", price = "" )
|
|
# @product = product
|
|
# @price = price
|
|
# end
|
|
#
|
|
# def build
|
|
# b = binding
|
|
# # create and run templates, filling member data variebles
|
|
# ERB.new(<<-'END_PRODUCT'.gsub(/^\s+/, ""), 0, "", "@product").result b
|
|
# <%= PRODUCT[:name] %>
|
|
# <%= PRODUCT[:desc] %>
|
|
# END_PRODUCT
|
|
# ERB.new(<<-'END_PRICE'.gsub(/^\s+/, ""), 0, "", "@price").result b
|
|
# <%= PRODUCT[:name] %> -- <%= PRODUCT[:cost] %>
|
|
# <%= PRODUCT[:desc] %>
|
|
# END_PRICE
|
|
# end
|
|
# end
|
|
#
|
|
# # setup template data
|
|
# listings = Listings.new
|
|
# listings.build
|
|
#
|
|
# puts listings.product + "\n" + listings.price
|
|
#
|
|
# _Generates_
|
|
#
|
|
# Chicken Fried Steak
|
|
# A well messages pattie, breaded and fried.
|
|
#
|
|
# Chicken Fried Steak -- 9.95
|
|
# A well messages pattie, breaded and fried.
|
|
#
|
|
def initialize(str, safe_level=nil, trim_mode=nil, eoutvar='_erbout')
|
|
@safe_level = safe_level
|
|
compiler = ERB::Compiler.new(trim_mode)
|
|
set_eoutvar(compiler, eoutvar)
|
|
@src = compiler.compile(str)
|
|
@filename = nil
|
|
end
|
|
|
|
# The Ruby code generated by ERB
|
|
attr_reader :src
|
|
|
|
# The optional _filename_ argument passed to Kernel#eval when the ERB code
|
|
# is run
|
|
attr_accessor :filename
|
|
|
|
#
|
|
# Can be used to set _eoutvar_ as described in ERB#new. It's probably easier
|
|
# to just use the constructor though, since calling this method requires the
|
|
# setup of an ERB _compiler_ object.
|
|
#
|
|
def set_eoutvar(compiler, eoutvar = '_erbout')
|
|
compiler.put_cmd = "#{eoutvar}.concat"
|
|
compiler.insert_cmd = "#{eoutvar}.concat"
|
|
|
|
cmd = []
|
|
cmd.push "#{eoutvar} = ''"
|
|
|
|
compiler.pre_cmd = cmd
|
|
|
|
cmd = []
|
|
cmd.push(eoutvar)
|
|
|
|
compiler.post_cmd = cmd
|
|
end
|
|
|
|
# Generate results and print them. (see ERB#result)
|
|
def run(b=TOPLEVEL_BINDING)
|
|
print self.result(b)
|
|
end
|
|
|
|
#
|
|
# Executes the generated ERB code to produce a completed template, returning
|
|
# the results of that code. (See ERB#new for details on how this process can
|
|
# be affected by _safe_level_.)
|
|
#
|
|
# _b_ accepts a Binding or Proc object which is used to set the context of
|
|
# code evaluation.
|
|
#
|
|
def result(b=TOPLEVEL_BINDING)
|
|
if @safe_level
|
|
th = Thread.start {
|
|
$SAFE = @safe_level
|
|
eval(@src, b, (@filename || '(erb)'), 1)
|
|
}
|
|
return th.value
|
|
else
|
|
return eval(@src, b, (@filename || '(erb)'), 1)
|
|
end
|
|
end
|
|
|
|
def def_method(mod, methodname, fname='(ERB)') # :nodoc:
|
|
mod.module_eval("def #{methodname}\n" + self.src + "\nend\n", fname, 0)
|
|
end
|
|
|
|
def def_module(methodname='erb') # :nodoc:
|
|
mod = Module.new
|
|
def_method(mod, methodname)
|
|
mod
|
|
end
|
|
|
|
def def_class(superklass=Object, methodname='result') # :nodoc:
|
|
cls = Class.new(superklass)
|
|
def_method(cls, methodname)
|
|
cls
|
|
end
|
|
end
|
|
|
|
#--
|
|
# ERB::Util
|
|
class ERB
|
|
# A utility module for conversion routines, often handy in HTML generation.
|
|
module Util
|
|
public
|
|
#
|
|
# A utility method for escaping HTML tag characters in _s_.
|
|
#
|
|
# require "erb"
|
|
# include ERB::Util
|
|
#
|
|
# puts html_escape("is a > 0 & a < 10?")
|
|
#
|
|
# _Generates_
|
|
#
|
|
# is a > 0 & a < 10?
|
|
#
|
|
def html_escape(s)
|
|
s.to_s.gsub(/&/, "&").gsub(/\"/, """).gsub(/>/, ">").gsub(/</, "<")
|
|
end
|
|
alias h html_escape
|
|
module_function :h
|
|
module_function :html_escape
|
|
|
|
#
|
|
# A utility method for encoding the String _s_ as a URL.
|
|
#
|
|
# require "erb"
|
|
# include ERB::Util
|
|
#
|
|
# puts url_encode("Programming Ruby: The Pragmatic Programmer's Guide")
|
|
#
|
|
# _Generates_
|
|
#
|
|
# Programming%20Ruby%3A%20%20The%20Pragmatic%20Programmer%27s%20Guide
|
|
#
|
|
def url_encode(s)
|
|
s.to_s.gsub(/[^a-zA-Z0-9_\-.]/n){ sprintf("%%%02X", $&.unpack("C")[0]) }
|
|
end
|
|
alias u url_encode
|
|
module_function :u
|
|
module_function :url_encode
|
|
end
|
|
end
|
|
|
|
#--
|
|
# ERB::DefMethod
|
|
class ERB
|
|
module DefMethod # :nodoc:
|
|
public
|
|
def def_erb_method(methodname, erb)
|
|
if erb.kind_of? String
|
|
fname = erb
|
|
File.open(fname) {|f| erb = ERB.new(f.read) }
|
|
erb.def_method(self, methodname, fname)
|
|
else
|
|
erb.def_method(self, methodname)
|
|
end
|
|
end
|
|
module_function :def_erb_method
|
|
end
|
|
end
|