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author | Sam Stephenson <sam@37signals.com> | 2007-03-18 07:05:58 +0000 |
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committer | Sam Stephenson <sam@37signals.com> | 2007-03-18 07:05:58 +0000 |
commit | 3202fbabe6df3591d7e2c35727ea9c8b68df8828 (patch) | |
tree | c55f19f82564280e074d9aca449ee4848a97f158 /activesupport/lib/active_support/json/decoding.rb | |
parent | 3d5c947155934fb498f8788a204ae9f2e03f2f42 (diff) | |
download | rails-3202fbabe6df3591d7e2c35727ea9c8b68df8828.tar.gz rails-3202fbabe6df3591d7e2c35727ea9c8b68df8828.tar.bz2 rails-3202fbabe6df3591d7e2c35727ea9c8b68df8828.zip |
Refactor ActiveSupport::JSON to be less obtuse. Add support for JSON decoding by way of Syck with ActiveSupport::JSON.decode(json_string). Prevent hash keys that are JavaScript reserved words from being unquoted during encoding.
git-svn-id: http://svn-commit.rubyonrails.org/rails/trunk@6443 5ecf4fe2-1ee6-0310-87b1-e25e094e27de
Diffstat (limited to 'activesupport/lib/active_support/json/decoding.rb')
-rw-r--r-- | activesupport/lib/active_support/json/decoding.rb | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/activesupport/lib/active_support/json/decoding.rb b/activesupport/lib/active_support/json/decoding.rb new file mode 100644 index 0000000000..60003a94e5 --- /dev/null +++ b/activesupport/lib/active_support/json/decoding.rb @@ -0,0 +1,40 @@ +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 |