Class: Argstring::Lexer::AssignmentFinder

Inherits:
Object
  • Object
show all
Defined in:
lib/argstring/lexer/assignment_finder.rb

Instance Method Summary collapse

Constructor Details

#initialize(config) ⇒ AssignmentFinder

Returns a new instance of AssignmentFinder.



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# File 'lib/argstring/lexer/assignment_finder.rb', line 6

def initialize(config)
	@config = config
end

Instance Method Details

#indices(segment, errors:) ⇒ Object

Find all top-level assignment operators in the segment. Returns array of indices into the segment string.



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# File 'lib/argstring/lexer/assignment_finder.rb', line 12

def indices(segment, errors:)
	indices = []

	i = 0
	in_enclosure = false
	current_encloser = nil

	while i < segment.length
		ch = segment[i]

		if in_enclosure
			if @config.escape_enabled? && ch == @config.escape
				i = advance_past_escape(segment, i)
				next
			end

			if ch == current_encloser[:close]
				in_enclosure = false
				current_encloser = nil
			end
			i += 1
			next
		end

		pair = @config.encloser_open_pair_for(ch)
		if pair
			in_enclosure = true
			current_encloser = pair
			i += 1
			next
		end

		if @config.escape_enabled? && ch == @config.escape
			i = advance_past_escape(segment, i)
			next
		end

		if @config.assignment.include?(ch)
			indices << i
		end

		i += 1
	end

	if in_enclosure
		errors << ParseError.new(
			code: :unterminated_enclosure,
			message: "Unterminated enclosure in segment",
			raw: segment
		)
		return []
	end

	indices
end