Module: HashDiff
- Defined in:
- lib/hashdiff/patch.rb,
lib/hashdiff/lcs.rb,
lib/hashdiff/diff.rb,
lib/hashdiff/util.rb,
lib/hashdiff/version.rb
Overview
This module provides methods to diff two hash, patch and unpatch hash
Constant Summary collapse
- VERSION =
'0.2.2'
Class Method Summary collapse
-
.best_diff(obj1, obj2, options = {}) {|path, value1, value2| ... } ⇒ Array
Best diff two objects, which tries to generate the smallest change set using different similarity values.
-
.diff(obj1, obj2, options = {}) {|path, value1, value2| ... } ⇒ Array
Compute the diff of two hashes or arrays.
-
.patch!(obj, changes, options = {}) ⇒ Object
Apply patch to object.
-
.unpatch!(obj, changes, options = {}) ⇒ Object
Unpatch an object.
Class Method Details
.best_diff(obj1, obj2, options = {}) {|path, value1, value2| ... } ⇒ Array
Best diff two objects, which tries to generate the smallest change set using different similarity values.
HashDiff.best_diff is useful in case of comparing two objects which include similar hashes in arrays.
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# File 'lib/hashdiff/diff.rb', line 27 def self.best_diff(obj1, obj2, = {}, &block) [:comparison] = block if block_given? opts = { :similarity => 0.3 }.merge!() diffs_1 = diff(obj1, obj2, opts) count_1 = count_diff diffs_1 opts = { :similarity => 0.5 }.merge!() diffs_2 = diff(obj1, obj2, opts) count_2 = count_diff diffs_2 opts = { :similarity => 0.8 }.merge!() diffs_3 = diff(obj1, obj2, opts) count_3 = count_diff diffs_3 count, diffs = count_1 < count_2 ? [count_1, diffs_1] : [count_2, diffs_2] diffs = count < count_3 ? diffs : diffs_3 end |
.diff(obj1, obj2, options = {}) {|path, value1, value2| ... } ⇒ Array
Compute the diff of two hashes or arrays
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# File 'lib/hashdiff/diff.rb', line 70 def self.diff(obj1, obj2, = {}, &block) opts = { :prefix => '', :similarity => 0.8, :delimiter => '.', :strict => true, :strip => false, :numeric_tolerance => 0 }.merge!() opts[:comparison] = block if block_given? # prefer to compare with provided block result = custom_compare(opts[:comparison], opts[:prefix], obj1, obj2) return result if result if obj1.nil? and obj2.nil? return [] end if obj1.nil? return [['~', opts[:prefix], nil, obj2]] end if obj2.nil? return [['~', opts[:prefix], obj1, nil]] end unless comparable?(obj1, obj2, opts[:strict]) return [['~', opts[:prefix], obj1, obj2]] end result = [] if obj1.is_a?(Array) changeset = diff_array(obj1, obj2, opts) do |lcs| # use a's index for similarity lcs.each do |pair| result.concat(diff(obj1[pair[0]], obj2[pair[1]], opts.merge(:prefix => "#{opts[:prefix]}[#{pair[0]}]"))) end end changeset.each do |change| if change[0] == '-' result << ['-', "#{opts[:prefix]}[#{change[1]}]", change[2]] elsif change[0] == '+' result << ['+', "#{opts[:prefix]}[#{change[1]}]", change[2]] end end elsif obj1.is_a?(Hash) if opts[:prefix].empty? prefix = "" else prefix = "#{opts[:prefix]}#{opts[:delimiter]}" end deleted_keys = obj1.keys - obj2.keys common_keys = obj1.keys & obj2.keys added_keys = obj2.keys - obj1.keys # add deleted properties deleted_keys.sort.each do |k| custom_result = custom_compare(opts[:comparison], "#{prefix}#{k}", obj1[k], nil) if custom_result result.concat(custom_result) else result << ['-', "#{prefix}#{k}", obj1[k]] end end # recursive comparison for common keys common_keys.sort.each {|k| result.concat(diff(obj1[k], obj2[k], opts.merge(:prefix => "#{prefix}#{k}"))) } # added properties added_keys.sort.each do |k| unless obj1.key?(k) custom_result = custom_compare(opts[:comparison], "#{prefix}#{k}", nil, obj2[k]) if custom_result result.concat(custom_result) else result << ['+', "#{prefix}#{k}", obj2[k]] end end end else return [] if compare_values(obj1, obj2, opts) return [['~', opts[:prefix], obj1, obj2]] end result end |
.patch!(obj, changes, options = {}) ⇒ Object
Apply patch to object
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# File 'lib/hashdiff/patch.rb', line 16 def self.patch!(obj, changes, = {}) delimiter = [:delimiter] || '.' changes.each do |change| parts = decode_property_path(change[1], delimiter) last_part = parts.last parent_node = node(obj, parts[0, parts.size-1]) if change[0] == '+' if last_part.is_a?(Fixnum) parent_node.insert(last_part, change[2]) else parent_node[last_part] = change[2] end elsif change[0] == '-' if last_part.is_a?(Fixnum) parent_node.delete_at(last_part) else parent_node.delete(last_part) end elsif change[0] == '~' parent_node[last_part] = change[3] end end obj end |
.unpatch!(obj, changes, options = {}) ⇒ Object
Unpatch an object
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# File 'lib/hashdiff/patch.rb', line 55 def self.unpatch!(obj, changes, = {}) delimiter = [:delimiter] || '.' changes.reverse_each do |change| parts = decode_property_path(change[1], delimiter) last_part = parts.last parent_node = node(obj, parts[0, parts.size-1]) if change[0] == '+' if last_part.is_a?(Fixnum) parent_node.delete_at(last_part) else parent_node.delete(last_part) end elsif change[0] == '-' if last_part.is_a?(Fixnum) parent_node.insert(last_part, change[2]) else parent_node[last_part] = change[2] end elsif change[0] == '~' parent_node[last_part] = change[2] end end obj end |