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The following commit(s) were added to refs/heads/master by this push:
new b8627d18 Initial stab at comparing JSON files
b8627d18 is described below
commit b8627d18d4f30b353b46cc8583312828ab287d9d
Author: Sebb <[email protected]>
AuthorDate: Sun Feb 25 15:27:44 2024 +0000
Initial stab at comparing JSON files
---
lib/whimsy/asf/json-utils.rb | 69 ++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 69 insertions(+)
diff --git a/lib/whimsy/asf/json-utils.rb b/lib/whimsy/asf/json-utils.rb
new file mode 100644
index 00000000..f07a730e
--- /dev/null
+++ b/lib/whimsy/asf/json-utils.rb
@@ -0,0 +1,69 @@
+# JSON utilities
+
+# This addon must be required before use
+
+require 'json'
+
+module ASFJSON
+ # Compare JSON files
+ # bc = breadcrumb
+ # yield the changes for subsequent processing:
+ # bc, type (Dropped, Scalar, Array, Added), key, args (scalar or array)
+ def self.cmphash(h1, h2, bc=nil, &block)
+ bc ||= ['root']
+ h1.each do |k, v1|
+ v2 = h2[k]
+ if v2.nil?
+ yield [bc, 'Dropped', k, v1]
+ elsif v1 != v2
+ case v1.class.to_s
+ when 'String', 'Integer'
+ yield [bc, 'Scalar', k, [v1, v2]]
+ when 'Array'
+ yield [bc, 'Array', k, [v1, v2]]
+ when 'Hash'
+ self.cmphash v1, v2, [bc,k].flatten, &block
+ else
+ raise ArgumentError.new "#{bc.join('.')} #{k} Unexpected class
#{v1.class}"
+ end
+ end
+ end
+ # Now deal with items not in old (other items have been compared?)
+ h2.each do |k,v2|
+ v1 = h1[k]
+ if v1.nil?
+ yield [bc, 'Added', k, v2]
+ end
+ end
+ end
+
+ # Sample method to process differences
+ def self.compare_json(old_json, new_json, out=$stdout)
+ cmphash old_json, new_json do |bc, type, key, args|
+ bcj = bc.join('.')
+ case type
+ when 'Scalar'
+ v1, v2 = args
+ out.puts [bcj, key, v1, '=>', v2].inspect
+ when 'Array'
+ v1, v2 = args
+ out.puts [bcj, 'Dropped', v1-v2, 'Added', v2-v1].inspect
+ when 'Dropped'
+ out.puts [bcj, 'Dropped', key, args].inspect
+ when 'Added'
+ out.puts [bcj, 'Added', key, args].inspect
+ else
+ raise ArgumentError.new "Unexpected type: #{type} in #{bc} #{key}"
+ end
+ end
+ end
+
+end
+
+if __FILE__ == $0
+ old_file = ARGV.shift or raise ArgumentError.new "Old file!"
+ new_file = ARGV.shift or raise ArgumentError.new "New file!"
+ old_json = JSON.parse(File.read(old_file))
+ new_json = JSON.parse(File.read(new_file))
+ ASFJSON.compare_json(old_json, new_json)
+end
