Class: ERBook::Template

Inherits:
Ember::Template
  • Object
show all
Defined in:
lib/erbook/template.rb

Overview

eRuby template that provides access to the underlying result buffer (which contains the result of template evaluation thus far) and provides sandboxing for isolated template rendering.

Defined Under Namespace

Classes: Sandbox

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(source, input, unindent = true, safe_level = nil) ⇒ Template

Parameters

source

Replacement for the ambiguous ‘(erb)’ identifier in stack traces; so that the user can better determine the source of an error.

input

A string containing eRuby directives.

unindent

If true, then all content blocks will be unindented hierarchically,

safe_level

See safe_level in ERB::new().



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# File 'lib/erbook/template.rb', line 33

def initialize source, input, unindent = true, safe_level = nil
  super input,
    :result_variable => :@buffer,
    :source_file     => source,
    :unindent        => unindent,
    :shorthand       => true,
    :infer_end       => true

  @sandbox = Sandbox.new

  if $DEBUG
    IO.popen('cat -n', 'w+') do |io|
      io.write self.program
      io.close_write
      STDERR.puts io.read
    end
  end
end

Instance Attribute Details

#sandbox ⇒ Object (readonly)

Returns the value of attribute sandbox.



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# File 'lib/erbook/template.rb', line 15

def sandbox
  @sandbox
end

Instance Method Details

#buffer ⇒ Object

Returns the result of template evaluation thus far.



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# File 'lib/erbook/template.rb', line 64

def buffer
  @sandbox.instance_variable_get(:@buffer)
end

#render ⇒ Object

Returns the output of evaluating this template inside the given context.

If no context is given, then the sandbox of this template is used.



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# File 'lib/erbook/template.rb', line 57

def render
  super @sandbox.instance_eval('binding')
end

#render_with(inst_vars = {}) ⇒ Object

Renders this template within a fresh sandbox that is populated with the given instance variables, whose names must be prefixed with ‘@’.



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# File 'lib/erbook/template.rb', line 72

def render_with inst_vars = {}
  old_sandbox = @sandbox

  begin
    @sandbox = Sandbox.new

    inst_vars.each_pair do |var, val|
      @sandbox.instance_variable_set var, val
    end

    render

  ensure
    @sandbox = old_sandbox
  end
end