Sha256: 6a3876ea53d347894b7568c4d7396d56c46ea5ffea5fdfe0c53c949baff98ab9
Contents?: true
Size: 1.89 KB
Versions: 7
Compression:
Stored size: 1.89 KB
Contents
# encoding: utf-8
require 'diff/lcs'
require 'diff/lcs/hunk'
require 'enumerator'
module TTY
module File
class Differ
# Create a Differ
#
# @api public
def initialize(string_a, string_b, options = {})
@string_a = string_a
@string_b = string_b
@format = options.fetch(:format, :unified)
@context_lines = options.fetch(:context_lines, 3)
end
# Find character difference between two strings
#
# @return [String]
# the difference between content or empty if no
# difference found
#
# @api public
def call
diffs = Diff::LCS.diff(string_a_lines, string_b_lines)
return '' if diffs.empty?
hunks = extract_hunks(diffs)
format_hunks(hunks)
end
private
def convert_to_lines(string)
string.split(/\n/).map(&:chomp)
end
def string_a_lines
convert_to_lines(@string_a)
end
def string_b_lines
convert_to_lines(@string_b)
end
# @api public
def extract_hunks(diffs)
file_length_difference = 0
diffs.map do |piece|
hunk = Diff::LCS::Hunk.new(string_a_lines, string_b_lines, piece,
@context_lines, file_length_difference)
file_length_difference = hunk.file_length_difference
hunk
end
end
# @api public
def format_hunks(hunks)
output = ""
hunks.each_cons(2) do |prev_hunk, current_hunk|
begin
if current_hunk.overlaps?(prev_hunk)
current_hunk.unshift(prev_hunk)
else
output << prev_hunk.diff(@format).to_s
end
ensure
output << "\n"
end
end
output << hunks.last.diff(@format) << "\n" if hunks.last
end
end # Differ
end # File
end # TTY
Version data entries
7 entries across 7 versions & 1 rubygems