Module: Ruby2JS::Filter::Functions

Includes:
SEXP
Defined in:
lib/ruby2js/filter/functions.rb

Constant Summary collapse

VAR_TO_ASSIGN = 
{
  lvar: :lvasgn,
  ivar: :ivasgn,
  cvar: :cvasgn,
  gvar: :gvasgn
}

Instance Method Summary collapse

Methods included from SEXP

#s

Instance Method Details

#on_block(node) ⇒ Object 



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# File 'lib/ruby2js/filter/functions.rb', line 211

def on_block(node)
  call = node.children.first
  if [:setInterval, :setTimeout].include? call.children[1]
    return super unless call.children.first == nil
    block = process s(:block, s(:send, nil, :proc), *node.children[1..-1])
    on_send call.updated nil, [*call.children[0..1], block,
      *call.children[2..-1]]

  elsif [:sub, :gsub, :sub!, :gsub!].include? call.children[1]
    return super if call.children.first == nil
    block = s(:block, s(:send, nil, :proc), node.children[1],
      s(:autoreturn, *node.children[2..-1]))
    process call.updated(nil, [*call.children, block])

  elsif call.children[1] == :select and call.children.length == 2
    call = call.updated nil, [call.children.first, :filter]
    node.updated nil, [process(call), process(node.children[1]),
      s(:autoreturn, *process_all(node.children[2..-1]))]

  elsif call.children[1] == :any? and call.children.length == 2
    call = call.updated nil, [call.children.first, :some]
    node.updated nil, [process(call), process(node.children[1]),
      s(:autoreturn, *process_all(node.children[2..-1]))]

  elsif call.children[1] == :all? and call.children.length == 2
    call = call.updated nil, [call.children.first, :every]
    node.updated nil, [process(call), process(node.children[1]),
      s(:autoreturn, *process_all(node.children[2..-1]))]

  elsif call.children[1] == :map and call.children.length == 2
    node.updated nil, [process(call), process(node.children[1]),
      s(:autoreturn, *process_all(node.children[2..-1]))]

  elsif [:map!, :select!].include? call.children[1]
    # input: a.map! {expression}
    # output: a.splice(0, a.length, *a.map {expression})
    method = (call.children[1] == :map! ? :map : :select)
    target = call.children.first
    process s(:send, target, :splice, s(:splat, s(:send, s(:array, 
      s(:int, 0), s(:attr, target, :length)), :concat,
      s(:block, s(:send, target, method, *call.children[2..-1]),
      *node.children[1..-1]))))

  else
    super
  end
end

#on_send(node) ⇒ Object 



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# File 'lib/ruby2js/filter/functions.rb', line 15

def on_send(node)
  target, method, *args = node.children

  if [:max, :min].include? node.children[1] and args.length == 0
    return super unless node.is_method?
    process s(:send, s(:attr, s(:const, nil, :Math), node.children[1]),
      :apply, s(:const, nil, :Math), target)

  elsif method == :keys and args.length == 0 and node.is_method?
    process s(:send, s(:const, nil, :Object), :keys, target)

  elsif method == :delete and args.length == 1
    process s(:undef, s(:send, target, :[], args.first))

  elsif method == :to_s
    process s(:send, target, :toString, *args)

  elsif method == :to_a
    process s(:send, target, :toArray, *args)

  elsif method == :to_i
    process node.updated :send, [nil, :parseInt, target, *args]

  elsif method == :to_f
    process node.updated :send, [nil, :parseFloat, target, *args]

  elsif method == :sub and args.length == 2
    process node.updated nil, [target, :replace, *args]

  elsif [:sub!, :gsub!].include? method
    method = :"#{method.to_s[0..-2]}"
    if VAR_TO_ASSIGN.keys.include? target.type
      process s(VAR_TO_ASSIGN[target.type], target.children[0], 
        s(:send, target, method, *node.children[2..-1]))
    elsif target.type == :send
      if target.children[0] == nil
        process s(:lvasgn, target.children[1], s(:send,
          s(:lvar, target.children[1]), method, *node.children[2..-1]))
      else
        process s(:send, target.children[0], :"#{target.children[1]}=", 
          s(:send, target, method, *node.children[2..-1]))
      end
    else
      super
    end

  elsif method == :gsub and args.length == 2
    before, after = args
    if before.type == :regexp
      before = s(:regexp, *before.children[0...-1],
        s(:regopt, :g, *before.children.last))
    elsif before.type == :str
      before = s(:regexp, s(:str, Regexp.escape(before.children.first)),
        s(:regopt, :g))
    end
    process node.updated nil, [target, :replace, before, after]

  elsif method == :ord and args.length == 0
    if target.type == :str
      process s(:int, target.children.last.ord)
    else
      process node.updated nil, [target, :charCodeAt, s(:int, 0)]
    end

  elsif method == :chr and args.length == 0
    if target.type == :int
      process s(:str, target.children.last.chr)
    else
      process node.updated nil, [s(:const, nil, :String), :fromCharCode,
        target]
    end

  elsif method == :empty? and args.length == 0
    process s(:send, s(:attr, target, :length), :==, s(:int, 0))

  elsif [:start_with?, :end_with?].include? method and args.length == 1
    if args.first.type == :str
      length = s(:int, args.first.children.first.length)
    else
      length = s(:attr, *args, :length)
    end

    if method == :start_with?
      process s(:send, s(:send, target, :substring, s(:int, 0), 
        length), :==, *args)
    else
      process s(:send, s(:send, target, :slice, 
        s(:send, length, :-@)), :==, *args)
    end

  elsif method == :clear and args.length == 0 and node.is_method?
    process s(:send, target, :length=, s(:int, 0))

  elsif method == :replace and args.length == 1
    process s(:begin, s(:send, target, :length=, s(:int, 0)),
       s(:send, target, :push, s(:splat, node.children[2])))

  elsif method == :include? and args.length == 1
    process s(:send, s(:send, target, :indexOf, args.first), :!=,
      s(:int, -1))

  elsif method == :each
    process node.updated nil, [target, :forEach, *args]

  elsif method == :downcase and args.length == 0
    process node.updated nil, [target, :toLowerCase]

  elsif method == :upcase and args.length == 0
    process node.updated nil, [target, :toUpperCase]

  elsif node.children[0..1] == [nil, :puts]
    process s(:send, s(:attr, nil, :console), :log, *args)

  elsif method == :first
    if node.children.length == 2
      process node.updated nil, [target, :[], s(:int, 0)]
    elsif node.children.length == 3
      process on_send node.updated nil, [target, :[], s(:erange,
        s(:int, 0), node.children[2])]
    else
      super
    end

  elsif method == :last
    if node.children.length == 2
      process on_send node.updated nil, [target, :[], s(:int, -1)]
    elsif node.children.length == 3
      process node.updated nil, [target, :slice,
        s(:send, s(:attr, target, :length), :-, node.children[2]),
        s(:attr, target, :length)]
    else
      super
    end


  elsif method == :[]
    index = args.first

    # resolve negative literal indexes
    i = proc do |index|
      if index.type == :int and index.children.first < 0
        process s(:send, s(:attr, target, :length), :-, 
          s(:int, -index.children.first))
      else
        index
      end
    end

    if index.type == :regexp
      process s(:send, s(:send, target, :match, index), :[], 
        args[1] || s(:int, 0))

    elsif node.children.length != 3
      super

    elsif index.type == :int and index.children.first < 0
      process node.updated nil, [target, :[], i.(index)]

    elsif index.type == :erange
      start, finish = index.children
      process node.updated nil, [target, :slice, i.(start), i.(finish)]

    elsif index.type == :irange
      start, finish = index.children
      start = i.(start)
      if finish.type == :int
        if finish.children.first == -1
          finish = s(:attr, target, :length)
        else
          finish = i.(s(:int, finish.children.first+1))
        end
      else
        finish = s(:send, finish, :+, s(:int, 1))
      end
      process node.updated nil, [target, :slice, start, finish]

    else
      super
    end

  elsif method == :reverse! and node.is_method? 
    # input: a.reverse!
    # output: a.splice(0, a.length, *a.reverse)
    target = node.children.first
    process s(:send, target, :splice, s(:int, 0), 
      s(:attr, target, :length), s(:splat, s(:send, target, 
      :"#{node.children[1].to_s[0..-2]}", *node.children[2..-1])))

  elsif method == :each_with_index
    process node.updated nil, [target, :forEach, *args]

  else
    super
  end
end