Class: Opal::Nodes::ScopeNode

Inherits:
Base
  • Object
show all
Defined in:
opal/lib/opal/nodes/scope.rb

Direct Known Subclasses

DefNode, IterNode, ModuleNode, SingletonClassNode, TopNode

Constant Summary

Constants included from Helpers

Helpers::BASIC_IDENTIFIER_RULES, Helpers::ES3_RESERVED_WORD_EXCLUSIVE, Helpers::ES51_RESERVED_WORD, Helpers::IMMUTABLE_PROPS, Helpers::PROTO_SPECIAL_METHODS, Helpers::PROTO_SPECIAL_PROPS

Instance Attribute Summary collapse

Attributes inherited from Base

#compiler, #type

Instance Method Summary collapse

Methods inherited from Base

#add_gvar, #add_ivar, #add_local, #add_temp, #children, children, #compile, #compile_to_fragments, #error, #expr, #expr?, #expr_or_nil, #fragment, handle, handlers, #helper, #process, #push, #recv, #recv?, #s, #scope, #stmt, #stmt?, #unshift, #while_loop, #with_temp, #wrap

Methods included from Helpers

#current_indent, #empty_line, #indent, #ivar, #js_falsy, #js_truthy, #js_truthy_optimize, #line, #lvar_to_js, #mid_to_jsid, #property, #valid_ivar_name?, #valid_name?, #variable

Constructor Details

#initialize ⇒ ScopeNode

Returns a new instance of ScopeNode



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# File 'opal/lib/opal/nodes/scope.rb', line 35

def initialize(*)
  super

  @locals   = []
  @temps    = []
  @args     = []
  @ivars    = []
  @gvars    = []
  @parent   = nil
  @queue    = []
  @unique   = 'a'
  @while_stack = []
  @identity = nil
  @defs     = nil

  @methods = []

  @uses_block = false

  # used by classes to store all ivars used in direct def methods
  @proto_ivars = []
end

Instance Attribute Details

#block_name ⇒ Object

The given block name for a def scope



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# File 'opal/lib/opal/nodes/scope.rb', line 14

def block_name
  @block_name
end

#catch_return ⇒ Object

Returns the value of attribute catch_return



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# File 'opal/lib/opal/nodes/scope.rb', line 33

def catch_return
  @catch_return
end

#defs ⇒ Object

true if singleton def, false otherwise



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# File 'opal/lib/opal/nodes/scope.rb', line 24

def defs
  @defs
end

#gvars ⇒ Object (readonly)

Returns the value of attribute gvars



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# File 'opal/lib/opal/nodes/scope.rb', line 19

def gvars
  @gvars
end

#ivars ⇒ Object (readonly)

Returns the value of attribute ivars



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# File 'opal/lib/opal/nodes/scope.rb', line 18

def ivars
  @ivars
end

#locals ⇒ Object (readonly)

Returns the value of attribute locals



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# File 'opal/lib/opal/nodes/scope.rb', line 17

def locals
  @locals
end

#methods ⇒ Object (readonly)

used by modules to know what methods to donate to includees



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# File 'opal/lib/opal/nodes/scope.rb', line 27

def methods
  @methods
end

#mid ⇒ Object

Returns the value of attribute mid



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# File 'opal/lib/opal/nodes/scope.rb', line 21

def mid
  @mid
end

#name ⇒ Object

The class or module name if this scope is a class scope



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# File 'opal/lib/opal/nodes/scope.rb', line 11

def name
  @name
end

#parent ⇒ Object

Every scope can have a parent scope



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# File 'opal/lib/opal/nodes/scope.rb', line 8

def parent
  @parent
end

#scope_name ⇒ Object (readonly)

Returns the value of attribute scope_name



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# File 'opal/lib/opal/nodes/scope.rb', line 16

def scope_name
  @scope_name
end

#uses_super ⇒ Object

uses parents super method



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# File 'opal/lib/opal/nodes/scope.rb', line 30

def uses_super
  @uses_super
end

#uses_zuper ⇒ Object

Returns the value of attribute uses_zuper



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# File 'opal/lib/opal/nodes/scope.rb', line 31

def uses_zuper
  @uses_zuper
end

Instance Method Details

#add_arg(arg) ⇒ Object 



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# File 'opal/lib/opal/nodes/scope.rb', line 160

def add_arg(arg)
  @args << arg unless @args.include? arg
  arg
end

#add_proto_ivar(ivar) ⇒ Object 



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# File 'opal/lib/opal/nodes/scope.rb', line 156

def add_proto_ivar(ivar)
  @proto_ivars << ivar unless @proto_ivars.include? ivar
end

#add_scope_gvar(gvar) ⇒ Object 



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# File 'opal/lib/opal/nodes/scope.rb', line 152

def add_scope_gvar(gvar)
  @gvars << gvar unless @gvars.include? gvar
end

#add_scope_ivar(ivar) ⇒ Object 



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# File 'opal/lib/opal/nodes/scope.rb', line 144

def add_scope_ivar(ivar)
  if def_in_class?
    @parent.add_proto_ivar ivar
  else
    @ivars << ivar unless @ivars.include? ivar
  end
end

#add_scope_local(local) ⇒ Object 



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# File 'opal/lib/opal/nodes/scope.rb', line 165

def add_scope_local(local)
  return if has_local? local

  @locals << local
end

#add_scope_temp(*tmps) ⇒ Object 



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# File 'opal/lib/opal/nodes/scope.rb', line 178

def add_scope_temp(*tmps)
  @temps.push(*tmps)
end

#class? ⇒ Boolean

Returns true if this is strictly a class scope

Returns:

  • (Boolean) 


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# File 'opal/lib/opal/nodes/scope.rb', line 73

def class?
  @type == :class
end

#class_scope? ⇒ Boolean

Returns true if this scope is a class/module body scope

Returns:

  • (Boolean) 


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# File 'opal/lib/opal/nodes/scope.rb', line 68

def class_scope?
  @type == :class or @type == :module
end

#def? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'opal/lib/opal/nodes/scope.rb', line 96

def def?
  @type == :def
end

#def_in_class? ⇒ Boolean

Is this a normal def method directly inside a class? This is used for optimizing ivars as we can set them to nil in the class body

Returns:

  • (Boolean) 


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# File 'opal/lib/opal/nodes/scope.rb', line 103

def def_in_class?
  !@defs && @type == :def && @parent && @parent.class?
end

#find_parent_def ⇒ Object 



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# File 'opal/lib/opal/nodes/scope.rb', line 245

def find_parent_def
  scope = self
  while scope = scope.parent
    if scope.def?
      return scope
    end
  end

  nil
end

#get_super_chain ⇒ Object 



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# File 'opal/lib/opal/nodes/scope.rb', line 256

def get_super_chain
  chain, scope, defn, mid = [], self, 'null', 'null'

  while scope
    if scope.type == :iter
      chain << scope.identify!
      scope = scope.parent if scope.parent

    elsif scope.type == :def
      defn = scope.identify!
      mid  = "'#{scope.mid}'"
      break

    else
      break
    end
  end

  [chain, defn, mid]
end

#has_local?(local) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'opal/lib/opal/nodes/scope.rb', line 171

def has_local?(local)
  return true if @locals.include? local or @args.include? local
  return @parent.has_local?(local) if @parent and @type == :iter

  false
end

#has_temp?(tmp) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'opal/lib/opal/nodes/scope.rb', line 182

def has_temp?(tmp)
  @temps.include? tmp
end

#identify! ⇒ Object 



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# File 'opal/lib/opal/nodes/scope.rb', line 232

def identify!
  return @identity if @identity

  @identity = @compiler.unique_temp
  @parent.add_scope_temp @identity if @parent

  @identity
end

#identity ⇒ Object 



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# File 'opal/lib/opal/nodes/scope.rb', line 241

def identity
  @identity
end

#in_scope(&block) ⇒ Object 



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# File 'opal/lib/opal/nodes/scope.rb', line 58

def in_scope(&block)
  indent do
    @parent = compiler.scope
    compiler.scope = self
    block.call self
    compiler.scope = @parent
  end
end

#in_while? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'opal/lib/opal/nodes/scope.rb', line 219

def in_while?
  !@while_stack.empty?
end

#iter? ⇒ Boolean

True if a block/iter scope

Returns:

  • (Boolean) 


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# File 'opal/lib/opal/nodes/scope.rb', line 92

def iter?
  @type == :iter
end

#module? ⇒ Boolean

True if this is a module scope

Returns:

  • (Boolean) 


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# File 'opal/lib/opal/nodes/scope.rb', line 78

def module?
  @type == :module
end

#new_temp ⇒ Object 



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# File 'opal/lib/opal/nodes/scope.rb', line 186

def new_temp
  return @queue.pop unless @queue.empty?

  tmp = next_temp
  @temps << tmp
  tmp
end

#next_temp ⇒ Object 



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# File 'opal/lib/opal/nodes/scope.rb', line 194

def next_temp
  while true
    tmp = "$#{@unique}"
    @unique = @unique.succ
    unless has_local?(tmp)
      break
    end
  end
  tmp
end

#pop_while ⇒ Object 



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# File 'opal/lib/opal/nodes/scope.rb', line 215

def pop_while
  @while_stack.pop
end

#proto ⇒ Object

Inside a class or module scope, the javascript variable name returned by this function points to the classes' prototype. This is the target to where methods are actually added inside a class body.



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# File 'opal/lib/opal/nodes/scope.rb', line 110

def proto
  "def"
end

#push_while ⇒ Object 



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# File 'opal/lib/opal/nodes/scope.rb', line 209

def push_while
  info = {}
  @while_stack.push info
  info
end

#queue_temp(name) ⇒ Object 



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# File 'opal/lib/opal/nodes/scope.rb', line 205

def queue_temp(name)
  @queue << name
end

#sclass? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'opal/lib/opal/nodes/scope.rb', line 82

def sclass?
  @type == :sclass
end

#to_vars ⇒ Object

Vars to use inside each scope



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# File 'opal/lib/opal/nodes/scope.rb', line 116

def to_vars
  vars = @temps.dup
  vars.push(*@locals.map { |l| "#{l} = nil" })

  iv = ivars.map do |ivar|
    "if (self#{ivar} == null) self#{ivar} = nil;\n"
  end

  gv = gvars.map do |gvar|
    "if ($gvars#{gvar} == null) $gvars#{gvar} = nil;\n"
  end

  indent = @compiler.parser_indent
  str  = vars.empty? ? '' : "var #{vars.join ', '};\n"
  str += "#{indent}#{iv.join indent}" unless ivars.empty?
  str += "#{indent}#{gv.join indent}" unless gvars.empty?

  if class? and !@proto_ivars.empty?
    #raise "FIXME to_vars"
    pvars = @proto_ivars.map { |i| "#{proto}#{i}"}.join(' = ')
    result = "%s\n%s%s = nil;" % [str, indent, pvars]
  else
    result = str
  end

  fragment(result)
end

#top? ⇒ Boolean

Returns true if this is a top scope (main file body)

Returns:

  • (Boolean) 


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# File 'opal/lib/opal/nodes/scope.rb', line 87

def top?
  @type == :top
end

#uses_block! ⇒ Object 



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# File 'opal/lib/opal/nodes/scope.rb', line 223

def uses_block!
  if @type == :iter && @parent
    @parent.uses_block!
  else
    @uses_block = true
    identify!
  end
end

#uses_block? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'opal/lib/opal/nodes/scope.rb', line 277

def uses_block?
  @uses_block
end