Class: Electr::ExpressionRule

Inherits:
BaseRule
  • Object
show all
Defined in:
lib/electr/parser/rules/expression_rule.rb

Overview

Rules an Electr expression.

TODO For now almost everything is an expression in Electr, so this is a somewhat complicated class. It should be refactored a lot.

Instance Method Summary collapse

Methods inherited from BaseRule

#initialize

Constructor Details

This class inherits a constructor from Electr::BaseRule

Instance Method Details

#apply ⇒ Object 



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# File 'lib/electr/parser/rules/expression_rule.rb', line 9

def apply
  while @units.size > 0
    if first_unit_fname?
      accept(:fname)
      accept(:open_parenthesis, '(')
      while @units.first && (not @units.first.closed_parenthesis?)
        accept(@units.first.type)
      end
      accept(:closed_parenthesis, ')')
    else
      accept(@units.first.type)
    end
  end

  sya = Sya.new(@series.dup)
  @series = sya.run

  if number?
    dig_series(@ast_node)
  else
    unit = @series.shift
    # If we want to handle = differently than other operators, we
    # can do something like the following:
    # node_class = unit.assign? ? AssignAST : OperatorAST
    # node = node_class.new(unit.value)
    node = OperatorAST.new(unit.value)
    dig_series(node) while @series.size > 0
    @ast_node.add_child(node)
  end
end