Sha256: c0d2972f43f8c5b454af4b3fa7c878c304b0ccf6bb89d1b659c820fca92f7586
Contents?: true
Size: 1.32 KB
Versions: 6
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Stored size: 1.32 KB
Contents
module Regexp::Expression
module Conditional
class TooManyBranches < StandardError
def initialize
super('The conditional expression has more than 2 branches')
end
end
class Condition < Regexp::Expression::Base
# Name or number of the referenced capturing group that determines state.
# Returns a String if reference is by name, Integer if by number.
def reference
ref = text.tr("'<>()", "")
ref =~ /\D/ ? ref : Integer(ref)
end
end
class Branch < Regexp::Expression::Sequence; end
class Expression < Regexp::Expression::Subexpression
def <<(exp)
expressions.last << exp
end
def add_sequence
raise TooManyBranches.new if branches.length == 2
Branch.add_to(self, { conditional_level: conditional_level + 1 })
end
alias :branch :add_sequence
def condition=(exp)
expressions.delete(condition)
expressions.unshift(exp)
end
def condition
find { |subexp| subexp.is_a?(Condition) }
end
def branches
select { |subexp| subexp.is_a?(Sequence) }
end
def reference
condition.reference
end
def to_s(format = :full)
"#{text}#{condition}#{branches.join('|')})#{quantifier_affix(format)}"
end
end
end
end
Version data entries
6 entries across 6 versions & 2 rubygems