Class: Twig::Node::For

Inherits:
Base
  • Object
show all
Defined in:
lib/twig/node/for.rb

Instance Attribute Summary

Attributes inherited from Base

#attributes, #lineno, #nodes, #source_context, #tag

Instance Method Summary collapse

Methods inherited from Base

#empty?, #length, #template_name, #to_s

Constructor Details

#initialize(key_target, value_target, seq, if_expr, body, else_expr, lineno) ⇒ For

Returns a new instance of For.



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# File 'lib/twig/node/for.rb', line 6

def initialize(key_target, value_target, seq, if_expr, body, else_expr, lineno)
  unless if_expr.nil?
    body = If.new(Nodes.new(AutoHash.new.add(if_expr, body)), nil, lineno)
  end

  loop = ForLoop.new(lineno)
  body = Nodes.new(AutoHash.new.add(body, loop))

  nodes = {
    key_target:,
    value_target:,
    seq:,
    body:,
  }

  unless else_expr.nil?
    nodes[:else_expr] = else_expr
  end

  super(nodes, { with_loop: true }, lineno)
end

Instance Method Details

#compile(compiler) ⇒ Object 



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# File 'lib/twig/node/for.rb', line 28

def compile(compiler)
  iteration_var = compiler.var_name
  function_var = compiler.var_name

  compiler.
    add_debug_info(self).
    write("#{iteration_var} = ::Twig::Runtime::LoopIterator.new(").
    subcompile(nodes[:seq]).
    raw(")\n").
    write("#{function_var} = lambda do |iterator, context, blocks, recurse, depth|\n").
    indent.
    write("parent = context.dup\n")

  if attributes[:with_loop]
    compiler.
      write('context[:loop] = ::Twig::Runtime::LoopContext.new(').
      raw("iterator, parent, blocks, recurse, depth)\n")
  end

  if nodes.key?(:else_expr)
    compiler.write("context[:_iterated] = false\n")
  end

  key_var = compiler.var_name
  value_var = compiler.var_name

  compiler.
    write("iterator.each do |#{key_var}, #{value_var}|\n").
    indent.
    write('').
    subcompile(nodes[:key_target]).
    raw(" = #{key_var}\n").
    write('').
    subcompile(nodes[:value_target]).
    raw(" = #{value_var}\n").
    subcompile(nodes[:body]).
    outdent.
    write("end\n")

  if nodes.key?(:else_expr)
    compiler.
      write("unless context[:_iterated]\n").
      indent.
      subcompile(nodes[:else_expr]).
      outdent.
      write("end\n")
  end

  compiler.
    write("context.remove!(:#{nodes[:key_target].attributes[:name]}, ").
    raw(":#{nodes[:value_target].attributes[:name]}")

  if attributes[:with_loop]
    compiler.raw(', :loop')
  end

  compiler.
    raw(")\n").
    write("context.keep!(parent.keys)\n").
    write("context.merge!(parent, overwrite: false)\n").
    outdent.
    write("end\n").
    write("#{function_var}.call(#{iteration_var}, context, blocks, #{function_var}, 0)\n")
end