diff options
Diffstat (limited to 'lib/gitlab/git/conflict_parser.rb')
-rw-r--r-- | lib/gitlab/git/conflict_parser.rb | 89 |
1 files changed, 89 insertions, 0 deletions
diff --git a/lib/gitlab/git/conflict_parser.rb b/lib/gitlab/git/conflict_parser.rb new file mode 100644 index 00000000000..90b03848aee --- /dev/null +++ b/lib/gitlab/git/conflict_parser.rb @@ -0,0 +1,89 @@ +module Gitlab + module Git + class ConflictParser + UnresolvableError = Class.new(StandardError) + UnmergeableFile = Class.new(UnresolvableError) + UnsupportedEncoding = Class.new(UnresolvableError) + + # Recoverable errors - the conflict can be resolved in an editor, but not with + # sections. + ParserError = Class.new(StandardError) + UnexpectedDelimiter = Class.new(ParserError) + MissingEndDelimiter = Class.new(ParserError) + + class << self + def parse(text, our_path:, their_path:, parent_file: nil) + validate_text!(text) + + line_obj_index = 0 + line_old = 1 + line_new = 1 + type = nil + lines = [] + conflict_start = "<<<<<<< #{our_path}" + conflict_middle = '=======' + conflict_end = ">>>>>>> #{their_path}" + + text.each_line.map do |line| + full_line = line.delete("\n") + + if full_line == conflict_start + validate_delimiter!(type.nil?) + + type = 'new' + elsif full_line == conflict_middle + validate_delimiter!(type == 'new') + + type = 'old' + elsif full_line == conflict_end + validate_delimiter!(type == 'old') + + type = nil + elsif line[0] == '\\' + type = 'nonewline' + lines << { + full_line: full_line, + type: type, + line_obj_index: line_obj_index, + line_old: line_old, + line_new: line_new + } + else + lines << { + full_line: full_line, + type: type, + line_obj_index: line_obj_index, + line_old: line_old, + line_new: line_new + } + + line_old += 1 if type != 'new' + line_new += 1 if type != 'old' + + line_obj_index += 1 + end + end + + raise MissingEndDelimiter unless type.nil? + + lines + end + + private + + def validate_text!(text) + raise UnmergeableFile if text.blank? # Typically a binary file + raise UnmergeableFile if text.length > 200.kilobytes + + text.force_encoding('UTF-8') + + raise UnsupportedEncoding unless text.valid_encoding? + end + + def validate_delimiter!(condition) + raise UnexpectedDelimiter unless condition + end + end + end + end +end |