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require 'yaml'
require 'strscan'
module ActiveSupport
module JSON
class ParseError < StandardError
end
class << self
# Converts a JSON string into a Ruby object.
def decode(json)
YAML.load(convert_json_to_yaml(json))
rescue ArgumentError => e
raise ParseError, "Invalid JSON string"
end
protected
# Ensure that ":" and "," are always followed by a space
def convert_json_to_yaml(json) #:nodoc:
scanner, quoting, marks = StringScanner.new(json), false, []
while scanner.scan_until(/(['":,]|\\.)/)
case char = scanner[1]
when '"', "'"
quoting = quoting == char ? false : char
when ":", ","
marks << scanner.pos - 1 unless quoting
end
end
if marks.empty?
json
else
ranges = ([0] + marks.map(&:succ)).zip(marks + [json.length])
ranges.map { |(left, right)| json[left..right] }.join(" ")
end
end
end
end
end
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