64 lines
2.1 KiB
Ruby
64 lines
2.1 KiB
Ruby
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
|
|
# matches YAML-formatted dates
|
|
DATE_REGEX = /^\d{4}-\d{2}-\d{2}|\d{4}-\d{1,2}-\d{1,2}[ \t]+\d{1,2}:\d{2}:\d{2}(\.[0-9]*)?(([ \t]*)Z|[-+]\d{2}?(:\d{2})?)?$/
|
|
|
|
# Ensure that ":" and "," are always followed by a space
|
|
def convert_json_to_yaml(json) #:nodoc:
|
|
scanner, quoting, marks, pos, times = StringScanner.new(json), false, [], nil, []
|
|
while scanner.scan_until(/(\\['"]|['":,\\]|\\.)/)
|
|
case char = scanner[1]
|
|
when '"', "'"
|
|
if !quoting
|
|
quoting = char
|
|
pos = scanner.pos
|
|
elsif quoting == char
|
|
if json[pos..scanner.pos-2] =~ DATE_REGEX
|
|
# found a date, track the exact positions of the quotes so we can remove them later.
|
|
# oh, and increment them for each current mark, each one is an extra padded space that bumps
|
|
# the position in the final YAML output
|
|
total_marks = marks.size
|
|
times << pos+total_marks << scanner.pos+total_marks
|
|
end
|
|
quoting = false
|
|
end
|
|
when ":",","
|
|
marks << scanner.pos - 1 unless quoting
|
|
end
|
|
end
|
|
|
|
if marks.empty?
|
|
json.gsub(/\\\//, '/')
|
|
else
|
|
left_pos = [-1].push(*marks)
|
|
right_pos = marks << json.length
|
|
output = []
|
|
left_pos.each_with_index do |left, i|
|
|
output << json[left.succ..right_pos[i]]
|
|
end
|
|
output = output * " "
|
|
|
|
times.each { |i| output[i-1] = ' ' }
|
|
output.gsub!(/\\\//, '/')
|
|
output
|
|
end
|
|
end
|
|
end
|
|
end
|
|
end
|