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Contents
# frozen_string_literal: true
module Nanoc
module Extra
# @api private
class SrcsetParser
class InvalidFormat < ::Nanoc::Core::Error
def initialize
super('Invalid srcset format')
end
end
REGEX_REST =
/
( # Zero or one of the following:
( # A width descriptor, consisting of:
\s+ # ASCII whitespace
\d+ # a valid non-negative integer
w # a U+0077 LATIN SMALL LETTER W character
)
|
( # A pixel density descriptor, consisting of
\s+ # ASCII whitespace
(\d*\.)?\d+ # a valid floating-point number
x # and a U+0078 LATIN SMALL LETTER X character.
)
)*
/x.freeze
def initialize(value)
@value = value
end
def call
matches = []
loop do
match = {}
scan(/\s*/)
match[:url] = scan(/[^, ]+/)
match[:rest] = scan(REGEX_REST)
scan(/\s*/)
matches << match
next if try_scan(/,/)
break if eos?
raise(InvalidFormat)
end
matches
rescue InvalidFormat
@value
end
private
def scan(pattern)
match = try_scan(pattern)
match || raise(InvalidFormat)
end
def try_scan(pattern)
scanner.scan(pattern)
end
def eos?
scanner.eos?
end
def scanner
@_scanner ||= StringScanner.new(@value)
end
end
end
end
Version data entries
31 entries across 31 versions & 1 rubygems