Class: StatefulParser

Inherits:
Object
  • Object
show all
Defined in:
lib/stateful_parser.rb,
lib/stateful_parser/version.rb

Defined Under Namespace

Classes: Error

Constant Summary collapse

VERSION = 
"0.1.1"

Instance Method Summary collapse

Constructor Details

#initialize(normalizer: nil) ⇒ StatefulParser

Returns a new instance of StatefulParser.



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# File 'lib/stateful_parser.rb', line 8

def initialize(normalizer: nil)
  @state = :none
  @states = []
  @normalizer = normalizer
end

Instance Method Details

#parse(line) {|@state, line| ... } ⇒ Object

Yields:



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# File 'lib/stateful_parser.rb', line 18

def parse(line)
  normalized_line = @normalizer ? @normalizer.call(line) : line
  matchers = @states.select { |s| s.last.include?(@state) || s.last.include?(:any) }
  new_state = nil
  matchers.each do |(name, match, _applies_to)|
    next unless normalized_line =~ match
    if new_state
      raise "multiple state transitions match: #{[new_state, name].inspect}"
    end

    new_state = name
  end
  @state = new_state if new_state
  yield @state, line
end

#parse_string(string, &block) ⇒ Object 



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# File 'lib/stateful_parser.rb', line 34

def parse_string(string, &block)
  string.each_line do |line|
    parse(line, &block)
  end
end

#state(name, match, applies_to = [:none]) ⇒ Object 



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# File 'lib/stateful_parser.rb', line 14

def state(name, match, applies_to = [:none])
  @states << [name, match, applies_to]
end