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module Origen
class Value
# Handles a value represented by a string of bin character(s) [0, 1, x, z]
#
# Capital X/Z will be accepted when defining the value, but they will be converted
# to lower case
class BinStrVal
attr_reader :val, :size
def initialize(value, options)
@val = clean(value)
if options[:size]
@size = options[:size]
# Trim any bits that are out of range...
@val = val.split(//).last(size).join
else
@size = val.size
end
end
def numeric?
!!(val =~ /^[01]+$/)
end
def to_i
if numeric?
val.to_i(2) & size.bit_mask
end
end
def to_s
"b#{val}"
end
# Returns the value of the given bit.
# Return nil if out of range, otherwise 0, 1 or an X or Z object
def [](index)
unless index > (size - 1)
if numeric?
to_i[index]
else
char = val[val.size - 1 - index]
if char == 'x'
X.new
elsif char == 'z'
Z.new
else
char.to_i
end
end
end
end
private
def clean(val)
val = val.to_s.strip.to_s[1..-1]
if valid?(val)
val.gsub('_', '').downcase
end
end
def valid?(val)
if val =~ /^[01_xXzZ]+$/
true
else
fail Origen::BinStrValError, "Binary string values can only contain: 0, 1, _, x, X, z, Z, this is invalid: #{val}"
end
end
end
end
end
Version data entries
59 entries across 59 versions & 1 rubygems