Contents

# encoding: utf-8
# frozen_string_literal: true

module Carbon
  module Compiler
    class Parser
      module Statements
        # Parses an if statement.
        module If
        protected

          def parse_statement_if
            expect :if
            expect :"("
            condition = parse_expression
            expect :")"
            body = parse_statement
            follow = parse_statement_if_continued

            Node::Statement::If.new([condition, body, follow])
          end

          def parse_statement_if_continued
            case peek.type
            when :elsif then parse_statement_if_elsif
            when :else  then parse_statement_if_else
            end
          end

          def parse_statement_if_elsif
            expect :elsif
            expect :"("
            condition = parse_expression
            expect :")"
            body = parse_statement
            follow = parse_statement_if_continued

            Node::Statement::Elsif.new([condition, body, follow])
          end

          def parse_statement_if_else
            expect :else

            Node::Statement::Else.new([parse_statement])
          end
        end
      end
    end
  end
end

Version data entries

1 entries across 1 versions & 1 rubygems

Version	Path
carbon-compiler-0.2.0	lib/carbon/compiler/parser/statements/if.rb