44 lines
1.2 KiB
Ruby
44 lines
1.2 KiB
Ruby
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# frozen_string_literal: true
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module Gitlab
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class UntrustedRegexp
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# This class implements support for Ruby syntax of regexps
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# and converts that to RE2 representation:
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# /<regexp>/<flags>
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class RubySyntax
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PATTERN = %r{^/(?<regexp>.+)/(?<flags>[ismU]*)$}.freeze
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# Checks if pattern matches a regexp pattern
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# but does not enforce it's validity
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def self.matches_syntax?(pattern)
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pattern.is_a?(String) && pattern.match(PATTERN).present?
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end
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# The regexp can match the pattern `/.../`, but may not be fabricatable:
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# it can be invalid or incomplete: `/match ( string/`
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def self.valid?(pattern)
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!!self.fabricate(pattern)
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end
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def self.fabricate(pattern)
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self.fabricate!(pattern)
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rescue RegexpError
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nil
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end
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def self.fabricate!(pattern)
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raise RegexpError, 'Pattern is not string!' unless pattern.is_a?(String)
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matches = pattern.match(PATTERN)
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raise RegexpError, 'Invalid regular expression!' if matches.nil?
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expression = matches[:regexp]
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flags = matches[:flags]
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expression.prepend("(?#{flags})") if flags.present?
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UntrustedRegexp.new(expression, multiline: false)
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end
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end
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end
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end
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