Class: Opal::Nodes::ScopeNode

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

Direct Known Subclasses

ModuleNode, NodeWithArgs, 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, Helpers::RESERVED_FUNCTION_NAMES

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?, truthy_optimize?, #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



37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
 
# File 'opal/lib/opal/nodes/scope.rb', line 37

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



14
15
16
 
# 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



33
34
35
 
# File 'opal/lib/opal/nodes/scope.rb', line 33

def catch_return
  @catch_return
end

#defs ⇒ Object

true if singleton def, false otherwise



24
25
26
 
# File 'opal/lib/opal/nodes/scope.rb', line 24

def defs
  @defs
end

#gvars ⇒ Object (readonly)

Returns the value of attribute gvars



19
20
21
 
# File 'opal/lib/opal/nodes/scope.rb', line 19

def gvars
  @gvars
end

#has_break ⇒ Object

Returns the value of attribute has_break



33
34
35
 
# File 'opal/lib/opal/nodes/scope.rb', line 33

def has_break
  @has_break
end

#ivars ⇒ Object (readonly)

Returns the value of attribute ivars



18
19
20
 
# File 'opal/lib/opal/nodes/scope.rb', line 18

def ivars
  @ivars
end

#locals ⇒ Object (readonly)

Returns the value of attribute locals



17
18
19
 
# 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



27
28
29
 
# File 'opal/lib/opal/nodes/scope.rb', line 27

def methods
  @methods
end

#mid ⇒ Object

Returns the value of attribute mid



21
22
23
 
# 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



11
12
13
 
# File 'opal/lib/opal/nodes/scope.rb', line 11

def name
  @name
end

#parent ⇒ Object

Every scope can have a parent scope



8
9
10
 
# File 'opal/lib/opal/nodes/scope.rb', line 8

def parent
  @parent
end

#rescue_else_sexp ⇒ Object

Returns the value of attribute rescue_else_sexp



35
36
37
 
# File 'opal/lib/opal/nodes/scope.rb', line 35

def rescue_else_sexp
  @rescue_else_sexp
end

#scope_name ⇒ Object (readonly)

Returns the value of attribute scope_name



16
17
18
 
# File 'opal/lib/opal/nodes/scope.rb', line 16

def scope_name
  @scope_name
end

#uses_super ⇒ Object

uses parents super method



30
31
32
 
# 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



31
32
33
 
# File 'opal/lib/opal/nodes/scope.rb', line 31

def uses_zuper
  @uses_zuper
end

Instance Method Details

#add_arg(arg) ⇒ Object 



162
163
164
165
 
# File 'opal/lib/opal/nodes/scope.rb', line 162

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

#add_proto_ivar(ivar) ⇒ Object 



158
159
160
 
# File 'opal/lib/opal/nodes/scope.rb', line 158

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

#add_scope_gvar(gvar) ⇒ Object 



154
155
156
 
# File 'opal/lib/opal/nodes/scope.rb', line 154

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

#add_scope_ivar(ivar) ⇒ Object 



146
147
148
149
150
151
152
 
# File 'opal/lib/opal/nodes/scope.rb', line 146

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 



167
168
169
170
171
 
# File 'opal/lib/opal/nodes/scope.rb', line 167

def add_scope_local(local)
  return if has_local? local

  @locals << local
end

#add_scope_temp(tmp) ⇒ Object 



179
180
181
182
183
 
# File 'opal/lib/opal/nodes/scope.rb', line 179

def add_scope_temp(tmp)
  return if has_temp?(tmp)

  @temps.push(tmp)
end

#class? ⇒ Boolean

Returns true if this is strictly a class scope

Returns:

  • (Boolean) 


75
76
77
 
# File 'opal/lib/opal/nodes/scope.rb', line 75

def class?
  @type == :class
end

#class_scope? ⇒ Boolean

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

Returns:

  • (Boolean) 


70
71
72
 
# File 'opal/lib/opal/nodes/scope.rb', line 70

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

#def? ⇒ Boolean

Returns:

  • (Boolean) 


98
99
100
 
# File 'opal/lib/opal/nodes/scope.rb', line 98

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) 


105
106
107
 
# File 'opal/lib/opal/nodes/scope.rb', line 105

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

#find_parent_def ⇒ Object 



248
249
250
251
252
253
254
255
256
257
 
# File 'opal/lib/opal/nodes/scope.rb', line 248

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

  nil
end

#get_super_chain ⇒ Object 



259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
 
# File 'opal/lib/opal/nodes/scope.rb', line 259

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) 


173
174
175
176
177
 
# File 'opal/lib/opal/nodes/scope.rb', line 173

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

#has_rescue_else? ⇒ Boolean

Returns:

  • (Boolean) 


284
285
286
 
# File 'opal/lib/opal/nodes/scope.rb', line 284

def has_rescue_else?
  !!rescue_else_sexp
end

#has_temp?(tmp) ⇒ Boolean

Returns:

  • (Boolean) 


185
186
187
 
# File 'opal/lib/opal/nodes/scope.rb', line 185

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

#identify! ⇒ Object 



235
236
237
238
239
240
241
242
 
# File 'opal/lib/opal/nodes/scope.rb', line 235

def identify!
  return @identity if @identity

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

  @identity
end

#identity ⇒ Object 



244
245
246
 
# File 'opal/lib/opal/nodes/scope.rb', line 244

def identity
  @identity
end

#in_ensure ⇒ Object 



288
289
290
291
292
293
294
 
# File 'opal/lib/opal/nodes/scope.rb', line 288

def in_ensure
  return unless block_given?

  @in_ensure = true
  result = yield
  @in_ensure = false
end

#in_ensure? ⇒ Boolean

Returns:

  • (Boolean) 


296
297
298
 
# File 'opal/lib/opal/nodes/scope.rb', line 296

def in_ensure?
  !!@in_ensure
end

#in_scope(&block) ⇒ Object 



60
61
62
63
64
65
66
67
 
# File 'opal/lib/opal/nodes/scope.rb', line 60

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) 


222
223
224
 
# File 'opal/lib/opal/nodes/scope.rb', line 222

def in_while?
  !@while_stack.empty?
end

#iter? ⇒ Boolean

True if a block/iter scope

Returns:

  • (Boolean) 


94
95
96
 
# File 'opal/lib/opal/nodes/scope.rb', line 94

def iter?
  @type == :iter
end

#module? ⇒ Boolean

True if this is a module scope

Returns:

  • (Boolean) 


80
81
82
 
# File 'opal/lib/opal/nodes/scope.rb', line 80

def module?
  @type == :module
end

#new_temp ⇒ Object 



189
190
191
192
193
194
195
 
# File 'opal/lib/opal/nodes/scope.rb', line 189

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

  tmp = next_temp
  @temps << tmp
  tmp
end

#next_temp ⇒ Object 



197
198
199
200
201
202
203
204
205
206
 
# File 'opal/lib/opal/nodes/scope.rb', line 197

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

#pop_while ⇒ Object 



218
219
220
 
# File 'opal/lib/opal/nodes/scope.rb', line 218

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.



112
113
114
 
# File 'opal/lib/opal/nodes/scope.rb', line 112

def proto
  "def"
end

#push_while ⇒ Object 



212
213
214
215
216
 
# File 'opal/lib/opal/nodes/scope.rb', line 212

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

#queue_temp(name) ⇒ Object 



208
209
210
 
# File 'opal/lib/opal/nodes/scope.rb', line 208

def queue_temp(name)
  @queue << name
end

#sclass? ⇒ Boolean

Returns:

  • (Boolean) 


84
85
86
 
# File 'opal/lib/opal/nodes/scope.rb', line 84

def sclass?
  @type == :sclass
end

#to_vars ⇒ Object

Vars to use inside each scope



118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
 
# File 'opal/lib/opal/nodes/scope.rb', line 118

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) 


89
90
91
 
# File 'opal/lib/opal/nodes/scope.rb', line 89

def top?
  @type == :top
end

#uses_block! ⇒ Object 



226
227
228
229
230
231
232
233
 
# File 'opal/lib/opal/nodes/scope.rb', line 226

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

#uses_block? ⇒ Boolean

Returns:

  • (Boolean) 


280
281
282
 
# File 'opal/lib/opal/nodes/scope.rb', line 280

def uses_block?
  @uses_block
end