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module Regexp::Expression
# A sequence of expressions. Differs from a Subexpressions by how it handles
# quantifiers, as it applies them to its last element instead of itself as
# a whole subexpression.
#
# Used as the base class for the Alternation alternatives, Conditional
# branches, and CharacterSet::Intersection intersected sequences.
class Sequence < Regexp::Expression::Subexpression
class << self
def add_to(subexpression, params = {}, active_opts = {})
sequence = at_levels(
subexpression.level,
subexpression.set_level,
params[:conditional_level] || subexpression.conditional_level
)
sequence.nesting_level = subexpression.nesting_level + 1
sequence.options = active_opts
subexpression.expressions << sequence
sequence
end
def at_levels(level, set_level, conditional_level)
token = Regexp::Token.new(
:expression,
:sequence,
'',
nil, # ts
nil, # te
level,
set_level,
conditional_level
)
new(token)
end
end
def starts_at
expressions.first.starts_at
end
alias :ts :starts_at
def quantify(token, text, min = nil, max = nil, mode = :greedy)
offset = -1
target = expressions[offset]
while target.is_a?(FreeSpace)
target = expressions[offset -= 1]
end
target || raise(ArgumentError, "No valid target found for '#{text}' "\
'quantifier')
target.quantify(token, text, min, max, mode)
end
end
end
Version data entries
6 entries across 6 versions & 2 rubygems