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Contents
# Scheme booleans helper
module SchemeBooleansHelper
def if_idx_helper(other)
if other[0] == '('
idx = find_bracket_idx other, 0
(find_next_value other[idx + 1..-1])[0]
else
_, other = find_next_value other
(find_next_value other)[0]
end
end
def if_helper(expr, other)
if expr == '#f'
if_idx_helper other
else
(find_next_value other)[0]
end
end
end
# Scheme booleans module
module SchemeBooleans
include SchemeBooleansHelper
def equal?(other)
raise 'Incorrect number of arguments' if other.size != 2
other[0].to_s == other[1].to_s ? '#t' : '#f'
end
def not(other)
raise 'Incorrect number of arguments' if other.size != 1
raise 'Invalid data type' unless check_for_bool other[0]
other[0] == '#t' ? '#f' : '#t'
end
def if(other)
raise 'Incorrect number of arguments' if other.empty?
expr, other = find_next_value other
raise 'Incorrect number of arguments' if other.empty?
if_helper expr, other
end
end
Version data entries
4 entries across 4 versions & 1 rubygems