Class: Foxtail::Syntax::Parser::AST::BaseNode

Inherits:
Object
  • Object
show all
Defined in:
lib/foxtail/syntax/parser/ast/base_node.rb

Overview

Base class for all AST nodes in the Fluent parser Provides common functionality for type management and node equality

Direct Known Subclasses

Span, SyntaxNode

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ BaseNode

Returns a new instance of BaseNode.



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# File 'lib/foxtail/syntax/parser/ast/base_node.rb', line 17

def initialize = @type = self.class.name.split("::").last

Instance Attribute Details

#type ⇒ Object

Returns the value of attribute type.



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# File 'lib/foxtail/syntax/parser/ast/base_node.rb', line 15

def type
  @type
end

Instance Method Details

#==(other) ⇒ Object

Compare nodes for equality, ignoring span information



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# File 'lib/foxtail/syntax/parser/ast/base_node.rb', line 20

def ==(other)
  return false unless other.is_a?(BaseNode)

  this_keys = instance_variables.to_set {|v| v.to_s.delete("@") }
  other_keys = other.instance_variables.to_set {|v| v.to_s.delete("@") }

  # Always ignore span information in equality comparison
  this_keys.delete("span")
  other_keys.delete("span")

  return false if this_keys.size != other_keys.size

  this_keys.each do |field_name|
    return false unless other_keys.include?(field_name)

    this_val = instance_variable_get("@#{field_name}")
    other_val = other.instance_variable_get("@#{field_name}")

    return false unless this_val.class == other_val.class

    if this_val.is_a?(Array) && other_val.is_a?(Array)
      return false if this_val.length != other_val.length

      this_val.each_with_index do |item, i|
        return false unless item == other_val[i]
      end
    elsif this_val != other_val
      return false
    end
  end

  true
end

#accept(visitor) ⇒ Object

Accept a visitor and dispatch to the appropriate visit method



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# File 'lib/foxtail/syntax/parser/ast/base_node.rb', line 55

def accept(visitor)
  method_name = "visit_#{INFLECTOR.underscore(self.class.name.split("::").last)}"
  visitor.public_send(method_name, self)
end

#children ⇒ Object

Returns an array of child nodes for traversal Subclasses with children should override this method



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# File 'lib/foxtail/syntax/parser/ast/base_node.rb', line 62

def children = []

#to_h ⇒ Object

Convert node to hash representation for JSON serialization



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# File 'lib/foxtail/syntax/parser/ast/base_node.rb', line 65

def to_h
  result = {}
  instance_variables.each do |var|
    key = var.to_s.delete("@")
    value = instance_variable_get(var)
    result[key] = serialize_value(value)
  end
  result
end