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module Vedeu
# Converts the style value or value collection into a terminal escape
# sequence. Unrecognised values are discarded- an empty string is returned.
#
# Vedeu has a range of symbol styles which are compatible with most terminals
# which are ANSI compatible. Like colours, they can be defined in either
# interfaces, for specific lines or within streams.
# Styles are applied as encountered.
#
# @see Vedeu::Esc
#
class Style
include Vedeu::Common
# @!attribute [rw] value
# @return [String|Symbol]
attr_accessor :value
# Produces new objects of the correct class from the value, ignores objects
# that have already been coerced.
#
# @param value [Object|NilClass]
# @return [Object]
def self.coerce(value)
if value.nil?
new
elsif value.is_a?(self)
value
else
new(value)
end
end
# Return a new instance of Vedeu::Style.
#
# @param value [Array<String|Symbol>|String|Symbol]
# The style value or a collection of values.
# @return [Vedeu::Style]
def initialize(value = nil)
@value = value
end
# Return an attributes hash for this class.
#
# @return [Hash<Symbol => Array<String|Symbol>|String|Symbol>]
def attributes
{
style: value,
}
end
# An object is equal when its values are the same.
#
# @param other [Vedeu::Views::Char]
# @return [Boolean]
def eql?(other)
self.class == other.class && value == other.value
end
alias_method :==, :eql?
# Return the terminal escape sequences after converting the style or styles.
#
# @return [String]
def to_s
return '' unless present?(value)
@sequences ||= Array(value).flatten.map { |v| Vedeu::Esc.string(v) }.join
end
alias_method :escape_sequences, :to_s
alias_method :to_str, :to_s
end # Style
end # Vedeu
Version data entries
13 entries across 13 versions & 1 rubygems