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require_relative 'base'
class JsRegex
module Converter
#
# Template class implementation.
#
class AnchorConverter < JsRegex::Converter::Base
private
def convert_data
case subtype
when :bol, :bos then '^'
when :eol, :eos then '$'
when :eos_ob_eol then '(?=\n?$)'
when :word_boundary then convert_boundary
when :nonword_boundary then convert_nonboundary
else
warn_of_unsupported_feature
end
end
def convert_boundary
if context.es_2018_or_higher? && context.enable_u_option
BOUNDARY_EXPANSION
else
pass_boundary_with_warning
end
end
def convert_nonboundary
if context.es_2018_or_higher? && context.enable_u_option
NONBOUNDARY_EXPANSION
else
pass_boundary_with_warning
end
end
# This is an approximation to the word boundary behavior in Ruby, c.f.
# https://github.com/ruby/ruby/blob/08476c45/tool/enc-unicode.rb#L130
W = '\d\p{L}\p{M}\p{Pc}'
BOUNDARY_EXPANSION = "(?:(?<=[#{W}])(?=[^#{W}]|$)|(?<=[^#{W}]|^)(?=[#{W}]))"
NONBOUNDARY_EXPANSION = "(?<=[#{W}])(?=[#{W}])"
def pass_boundary_with_warning
warn_of("The anchor '#{data}' at index #{expression.ts} only works "\
'at ASCII word boundaries with targets below ES2018".')
pass_through
end
end
end
end
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