mirror of
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b17d8d727f
Signed-off-by: Santiago Pastorino <santiago@wyeworks.com>
111 lines
3.6 KiB
Ruby
111 lines
3.6 KiB
Ruby
require 'active_support/core_ext/string/starts_ends_with'
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module ActiveSupport
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module JSON
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module Backends
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module Yaml
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ParseError = ::StandardError
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extend self
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EXCEPTIONS = [::ArgumentError] # :nodoc:
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begin
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require 'psych'
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EXCEPTIONS << Psych::SyntaxError
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rescue LoadError
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end
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# Parses a JSON string or IO and converts it into an object
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def decode(json)
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if json.respond_to?(:read)
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json = json.read
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end
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YAML.load(convert_json_to_yaml(json))
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rescue *EXCEPTIONS => e
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raise ParseError, "Invalid JSON string: '%s'" % json
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end
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protected
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# Ensure that ":" and "," are always followed by a space
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def convert_json_to_yaml(json) #:nodoc:
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require 'strscan' unless defined? ::StringScanner
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scanner, quoting, marks, pos, times = ::StringScanner.new(json), false, [], nil, []
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while scanner.scan_until(/(\\['"]|['":,\\]|\\.)/)
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case char = scanner[1]
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when '"', "'"
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if !quoting
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quoting = char
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pos = scanner.pos
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elsif quoting == char
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if valid_date?(json[pos..scanner.pos-2])
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# found a date, track the exact positions of the quotes so we can
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# overwrite them with spaces later.
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times << pos
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end
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quoting = false
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end
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when ":",","
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marks << scanner.pos - 1 unless quoting
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when "\\"
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scanner.skip(/\\/)
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end
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end
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if marks.empty?
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json.gsub(/\\([\\\/]|u[[:xdigit:]]{4})/) do
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ustr = $1
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if ustr.start_with?('u')
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char = [ustr[1..-1].to_i(16)].pack("U")
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# "\n" needs extra escaping due to yaml formatting
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char == "\n" ? "\\n" : char
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elsif ustr == '\\'
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'\\\\'
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else
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ustr
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end
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end
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else
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left_pos = [-1].push(*marks)
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right_pos = marks << scanner.pos + scanner.rest_size
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output = []
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left_pos.each_with_index do |left, i|
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scanner.pos = left.succ
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chunk = scanner.peek(right_pos[i] - scanner.pos + 1)
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# overwrite the quotes found around the dates with spaces
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while times.size > 0 && times[0] <= right_pos[i]
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chunk.insert(times.shift - scanner.pos - 1, '! ')
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end
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chunk.gsub!(/\\([\\\/]|u[[:xdigit:]]{4})/) do
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ustr = $1
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if ustr.start_with?('u')
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char = [ustr[1..-1].to_i(16)].pack("U")
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# "\n" needs extra escaping due to yaml formatting
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char == "\n" ? "\\n" : char
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elsif ustr == '\\'
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'\\\\'
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else
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ustr
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end
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end
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output << chunk
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end
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output = output * " "
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output.gsub!(/\\\//, '/')
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output
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end
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end
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private
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def valid_date?(date_string)
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begin
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date_string =~ DATE_REGEX && DateTime.parse(date_string)
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rescue ArgumentError
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false
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end
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end
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end
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end
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end
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end
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