# encoding: utf-8

module JLDrill

    # Resolves files based on a load path
    class LoadPath
        def initialize()
            @loadPath = []
        end

        # Returns true if the load path contains no entries
        def empty?()
            return @loadPath.empty?
        end

        # Find a file in the load path.
        # Returns nil if no such file exists, or the path the the file
        # highest up on the load path.
        def find(filename)
            retVal = @loadPath.find do |path|
                File.exists?(File.join(path, filename))
            end
            if !retVal.nil?
                retVal = File.join(retVal, filename)
            end
            return retVal
        end

        # Add a path to the load path.
        # This path will be added to the end of the load path.
        # A path equalling nil will not be added
        def add(path)
            if !path.nil?
                @loadPath.push(path)
            end
        end

        # Return a string representation of the load path.
        # This is essentially the paths separated by colons.
        def to_s
            return @loadPath.join(":")
        end
    end
end