class Regexp::Expression::Sequence
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.
Public Class Methods
add_to(subexpression, params = {}, active_opts = {})
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# File lib/regexp_parser/expression/sequence.rb, line 21 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
at_levels(level, set_level, conditional_level)
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# File lib/regexp_parser/expression/sequence.rb, line 33 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
new(*args)
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TODO: this override is here for backwards compatibility, remove in 2.0.0
Calls superclass method
Regexp::Expression::Subexpression::new
# File lib/regexp_parser/expression/sequence.rb, line 11 def initialize(*args) if args.count == 3 warn('WARNING: Sequence.new without a Regexp::Token argument is '\ 'deprecated and will be removed in 2.0.0.') return self.class.at_levels(*args) end super end
Public Instance Methods
quantify(token, text, min = nil, max = nil, mode = :greedy)
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# File lib/regexp_parser/expression/sequence.rb, line 53 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
starts_at()
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# File lib/regexp_parser/expression/sequence.rb, line 48 def starts_at expressions.first.starts_at end
Also aliased as: ts