Class: PageTemplate::LoopCommand

Inherits:
StackableCommand show all
Defined in:
lib/PageTemplate/commands.rb

Overview

LoopCommand is a StackableCommand. It requires an opening:

% if variable %

or [% unless variable %].

variable is fetched from the namespace.

On execution, if variable is true, and non-empty, then its own namespace and passed to the loop commands. (a list is defined as an object that responds to :map)

If variable is true, but does not respond to :map, then the list is called once

% else %

may be specified, modifying LoopCommand to print out

Instance Attribute Summary

Attributes inherited from Command

#called_as

Instance Method Summary collapse

Methods inherited from StackableCommand

#end

Constructor Details

#initialize(called_as, value, iterators) ⇒ LoopCommand

% in variable %

or [% loop variable %]

Or [% in variable: name %]



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# File 'lib/PageTemplate/commands.rb', line 402

def initialize(called_as, value, iterators)
  @called_as = called_as
  @value     = value
  if iterators
    @iterators = iterators.strip.gsub(/\s+/, ' ').split
  else
    @iterators = nil
  end

  @switched  = false
  @commands  = BlockCommand.new
  @elseCommands = BlockCommand.new
  @in_else = false
end

Instance Method Details

#add(command) ⇒ Object

adds to @commands for the loop, or @elseCommands if ‘else’ has been passed.



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# File 'lib/PageTemplate/commands.rb', line 425

def add(command)
  unless @in_else
    @commands.add command
  else
    @elseCommands.add command
  end
end

#else ⇒ Object

An ‘else’ defines a list of commands to call when the loop is empty.

Raises:

  • (ArgumentError) 


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# File 'lib/PageTemplate/commands.rb', line 418

def else
  raise ArgumentError, "More than one 'else' to IfCommand" if @switched
  @in_else = ! @in_else
  @switched = true
end

#output(namespace) ⇒ Object

If variable is true, and non-empty, then @commands is printed once with each item in the list placed in its own namespace and passed to the loop commands. (a list is defined as an object that responds to :map)

If variable is true, but does not respond to :map, then the list is called once



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# File 'lib/PageTemplate/commands.rb', line 439

def output(namespace)

  vals = namespace.get(@value)
  ns = nil
  return @elseCommands.output(namespace) unless vals
  unless vals.respond_to?(:map) && vals.respond_to?(:length)
    vals = [vals]
  end

  return @elseCommands.output(namespace) if vals.empty?

  # Unfortunately, no "map_with_index"
  len = vals.length
  i = 1
  odd = true
  ns = Namespace.new(namespace)

  # Print the output of all the objects joined together.
  case
  when @iterators.nil? || @iterators.empty?
    vals.map { |item|
      ns.clear
      ns.object = item
      ns['__FIRST__'] = (i == 1) ? true : false
      ns['__LAST__'] = (i == len) ? true : false
      ns['__ODD__'] = odd
      ns['__INDEX__'] = i-1
      odd = ! odd
      i += 1
      @commands.output(ns)
    }.join('')
  when @iterators.size == 1
    iterator = @iterators[0]
    vals.map { |item|
      ns.clear_cache
      # We have an explicit iterator - don't set an object for it.
      # ns.object = item
      ns['__FIRST__'] = (i == 1) ? true : false
      ns['__LAST__'] = (i == len) ? true : false
      ns['__ODD__'] = odd
      ns['__INDEX__'] = i-1
      odd = ! odd
      ns[iterator] = item
      i += 1
      @commands.output(ns)
    }.join('')
  else
    vals.map { |list|
      ns.clear_cache
      ns['__FIRST__'] = (i == 1) ? true : false
      ns['__LAST__'] = (i == len) ? true : false
      ns['__ODD__'] = odd
      ns['__INDEX__'] = i-1
      @iterators.each_with_index do |iterator,index|
        ns[iterator] = list[index]
      end
      odd = ! odd
      i += 1
      @commands.output(ns)
    }.join('')
  end
end

#to_s ⇒ Object 



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# File 'lib/PageTemplate/commands.rb', line 502

def to_s
  str = "[ Loop: #{@value} " + @commands.to_s
  str << " Else: " + @elseCommands.to_s if @elseCommands.length > 0
  str << ' ]'
  str
end