Class: Packcr::Node::RuleNode

Inherits:
Packcr::Node show all
Defined in:
lib/packcr/node/rule_node.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods inherited from Packcr::Node

#alt, #link_references, #reversible?, #seq, #sequence?, #setup_rule, #verify_captures, #verify_variables

Constructor Details

#initialize(expr = nil, name = nil, line = nil, col = nil) ⇒ RuleNode

Returns a new instance of RuleNode.



6
7
8
9
10
11
12
13
14
15
16
 
# File 'lib/packcr/node/rule_node.rb', line 6

def initialize(expr = nil, name = nil, line = nil, col = nil)
  super()
  self.ref = 0
  self.vars = []
  self.capts = []
  self.codes = []
  @expr = expr
  @name = name
  @line = line
  @col = col
end

Instance Attribute Details

#capts ⇒ Object

Returns the value of attribute capts.



4
5
6
 
# File 'lib/packcr/node/rule_node.rb', line 4

def capts
  @capts
end

#codes ⇒ Object

Returns the value of attribute codes.



4
5
6
 
# File 'lib/packcr/node/rule_node.rb', line 4

def codes
  @codes
end

#col ⇒ Object

Returns the value of attribute col.



4
5
6
 
# File 'lib/packcr/node/rule_node.rb', line 4

def col
  @col
end

#expr ⇒ Object

Returns the value of attribute expr.



4
5
6
 
# File 'lib/packcr/node/rule_node.rb', line 4

def expr
  @expr
end

#line ⇒ Object

Returns the value of attribute line.



4
5
6
 
# File 'lib/packcr/node/rule_node.rb', line 4

def line
  @line
end

#name ⇒ Object

Returns the value of attribute name.



4
5
6
 
# File 'lib/packcr/node/rule_node.rb', line 4

def name
  @name
end

#ref ⇒ Object

Returns the value of attribute ref.



4
5
6
 
# File 'lib/packcr/node/rule_node.rb', line 4

def ref
  @ref
end

#top ⇒ Object

Returns the value of attribute top.



4
5
6
 
# File 'lib/packcr/node/rule_node.rb', line 4

def top
  @top
end

#vars ⇒ Object

Returns the value of attribute vars.



4
5
6
 
# File 'lib/packcr/node/rule_node.rb', line 4

def vars
  @vars
end

Instance Method Details

#add_ref ⇒ Object 



45
46
47
 
# File 'lib/packcr/node/rule_node.rb', line 45

def add_ref
  @ref += 1
end

#debug_dump(indent = 0) ⇒ Object 



18
19
20
21
22
 
# File 'lib/packcr/node/rule_node.rb', line 18

def debug_dump(indent = 0)
  $stdout.print "#{" " * indent}Rule(name:'#{name}', ref:#{ref}, vars.len:#{vars.length}, capts.len:#{capts.length}, codes.len:#{codes.length}) {\n"
  expr.debug_dump(indent + 2)
  $stdout.print "#{" " * indent}}\n"
end

#generate_code(gen, onfail, indent, bare, oncut: nil) ⇒ Object 



24
25
26
 
# File 'lib/packcr/node/rule_node.rb', line 24

def generate_code(gen, onfail, indent, bare, oncut: nil)
  gen.write Packcr.template("node/rule.#{gen.lang}.erb", binding, indent: indent, unwrap: bare)
end

#nodes ⇒ Object 



53
54
55
 
# File 'lib/packcr/node/rule_node.rb', line 53

def nodes
  [expr]
end

#reachability ⇒ Object 



28
29
30
 
# File 'lib/packcr/node/rule_node.rb', line 28

def reachability
  expr.reachability
end

#setup(ctx) ⇒ Object 



49
50
51
 
# File 'lib/packcr/node/rule_node.rb', line 49

def setup(ctx)
  super(ctx, self)
end

#to_h ⇒ Object 



57
58
59
60
61
62
 
# File 'lib/packcr/node/rule_node.rb', line 57

def to_h
  {
    type: :rule,
    expr: expr&.to_h,
  }
end

#verify(ctx) ⇒ Object 



32
33
34
35
36
 
# File 'lib/packcr/node/rule_node.rb', line 32

def verify(ctx)
  expr.verify_variables([])
  expr.verify_captures(ctx, [])
  verify_rule_reference(ctx)
end

#verify_rule_reference(ctx) ⇒ Object 



38
39
40
41
42
43
 
# File 'lib/packcr/node/rule_node.rb', line 38

def verify_rule_reference(ctx)
  return if top
  if ref == 0
    ctx.error line + 1, col + 1, "Never used rule '#{name}'"
  end
end