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Stored size: 1.47 KB
Contents
class CharacterSet
module Parser
module_function
def codepoints_from_enumerable(object)
raise ArgumentError, 'pass an Enumerable' unless object.respond_to?(:each)
# Use #each to check first element (only this works for all Enumerables)
object.each do |e|
return object if e.is_a?(Integer) && e >= 0 && e < 0x110000
return object.map(&:ord) if e.is_a?(String) && e.length == 1
raise ArgumentError, "#{e.inspect} is not valid as a codepoint"
end
end
def codepoints_from_bracket_expression(string)
raise ArgumentError, 'pass a String' unless string.is_a?(String)
raise ArgumentError, 'advanced syntax' if string =~ /\\[^uUx]|[^\\]\[|&&/
content = strip_brackets(string)
literal_content = eval_escapes(content)
prev_chr = nil
in_range = false
literal_content.each_char.map do |chr|
if chr == '-' && prev_chr && prev_chr != '\\' && prev_chr != '-'
in_range = true
nil
else
result = in_range ? ((prev_chr.ord + 1)..(chr.ord)).to_a : chr.ord
in_range = false
prev_chr = chr
result
end
end.compact.flatten
end
def strip_brackets(string)
string[/\A\[\^?(.*)\]\z/, 1] || string.dup
end
def eval_escapes(string)
string.gsub(/\\U(\h{8})|\\u(\h{4})|U\+(\h+)|\\x(\h{2})|\\u\{(\h+)\}/) do
($1 || $2 || $3 || $4 || $5).to_i(16).chr('utf-8')
end
end
end
end
Version data entries
14 entries across 14 versions & 1 rubygems