debian-mirror-gitlab/lib/gitlab/quick_actions/extractor.rb

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module Gitlab
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module QuickActions
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# This class takes an array of commands that should be extracted from a
# given text.
#
# ```
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# extractor = Gitlab::QuickActions::Extractor.new([:open, :assign, :labels])
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# ```
class Extractor
attr_reader :command_definitions
def initialize(command_definitions)
@command_definitions = command_definitions
end
# Extracts commands from content and return an array of commands.
# The array looks like the following:
# [
# ['command1'],
# ['command3', 'arg1 arg2'],
# ]
# The command and the arguments are stripped.
# The original command text is removed from the given `content`.
#
# Usage:
# ```
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# extractor = Gitlab::QuickActions::Extractor.new([:open, :assign, :labels])
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# msg = %(hello\n/labels ~foo ~"bar baz"\nworld)
# commands = extractor.extract_commands(msg) #=> [['labels', '~foo ~"bar baz"']]
# msg #=> "hello\nworld"
# ```
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def extract_commands(content)
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return [content, []] unless content
content = content.dup
commands = []
content.delete!("\r")
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content.gsub!(commands_regex) do
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if $~[:cmd]
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commands << [$~[:cmd].downcase, $~[:arg]].reject(&:blank?)
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''
else
$~[0]
end
end
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content, commands = perform_substitutions(content, commands)
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[content.strip, commands]
end
private
# Builds a regular expression to match known commands.
# First match group captures the command name and
# second match group captures its arguments.
#
# It looks something like:
#
# /^\/(?<cmd>close|reopen|...)(?:( |$))(?<arg>[^\/\n]*)(?:\n|$)/
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def commands_regex
names = command_names.map(&:to_s)
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@commands_regex ||= %r{
(?<code>
# Code blocks:
# ```
# Anything, including `/cmd arg` which are ignored by this filter
# ```
^```
.+?
\n```$
)
|
(?<html>
# HTML block:
# <tag>
# Anything, including `/cmd arg` which are ignored by this filter
# </tag>
^<[^>]+?>\n
.+?
\n<\/[^>]+?>$
)
|
(?<html>
# Quote block:
# >>>
# Anything, including `/cmd arg` which are ignored by this filter
# >>>
^>>>
.+?
\n>>>$
)
|
(?:
# Command not in a blockquote, blockcode, or HTML tag:
# /close
^\/
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(?<cmd>#{Regexp.new(Regexp.union(names).source, Regexp::IGNORECASE)})
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(?:
[ ]
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(?<arg>[^\n]*)
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)?
(?:\n|$)
)
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}mix
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end
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def perform_substitutions(content, commands)
return unless content
substitution_definitions = self.command_definitions.select do |definition|
definition.is_a?(Gitlab::QuickActions::SubstitutionDefinition)
end
substitution_definitions.each do |substitution|
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match_data = substitution.match(content.downcase)
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if match_data
command = [substitution.name.to_s]
command << match_data[1] unless match_data[1].empty?
commands << command
end
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content = substitution.perform_substitution(self, content)
end
[content, commands]
end
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def command_names
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command_definitions.flat_map do |command|
next if command.noop?
command.all_names
end.compact
end
end
end
end