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module PictureTag
module Parsers
# This class takes in the arguments passed to the liquid tag, and splits it
# up into 'words' (correctly handling quotes and backslash escapes.)
#
# To handle quotes and backslash escaping, we have to parse the string by
# characters to break it up correctly. I'm sure there's a library to do
# this, but it's not that much code honestly. If this starts getting big,
# we'll pull in a new dependency.
#
class ArgSplitter
attr_reader :words
def initialize(raw_params)
@words = []
@word = ''
@in_quotes = false
@escaped = false
raw_params.each_char { |c| handle_char(c) }
add_word # We have to explicitly add the last one.
end
private
def handle_char(char)
# last character was a backslash:
if @escaped
close_escape char
# char is a backslash or a quote:
elsif char.match?(/["\\]/)
handle_special char
# Character isn't whitespace, or it's inside double quotes:
elsif @in_quotes || char.match(/\S/)
@word << char
# Character is whitespace outside of double quotes:
else
add_word
end
end
def add_word
return if @word.empty?
@words << @word
@word = ''
end
def handle_special(char)
case char
when '\\'
@escaped = true
when '"'
@in_quotes = !@in_quotes
@word << char
end
end
def close_escape(char)
@word << char
@escaped = false
end
end
end
end
Version data entries
9 entries across 9 versions & 1 rubygems