Class: Iriq::Recognizers::Integer

Inherits:
Iriq::Recognizer show all
Defined in:
lib/iriq/recognizers/integer.rb

Overview

Base-10 integer. Also returns :timestamp for plausible UNIX seconds / millis ranges, and :date for plausible YYYYMMDD compact dates — these share the digit-only lexical shape, and we want the most specific type.

Constant Summary collapse

PATTERN = 
/\A\d+\z/.freeze
COMPACT_DATE_PATTERN = 
/\A\d{8}\z/.freeze
TS_SECONDS_RANGE = 
1_000_000_000..9_999_999_999
TS_MILLIS_RANGE = 
1_000_000_000_000..9_999_999_999_999

Instance Method Summary collapse

Methods inherited from Iriq::Recognizer

ensemble

Instance Method Details

#try(segment) ⇒ Object 



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# File 'lib/iriq/recognizers/integer.rb', line 12

def try(segment)
  first  = segment.getbyte(0)
  digit0 = first && first >= 0x30 && first <= 0x39
  return nil unless digit0 && PATTERN.match?(segment)

  n = segment.to_i
  if TS_MILLIS_RANGE.cover?(n) || TS_SECONDS_RANGE.cover?(n)
    return { type: :timestamp, confidence: 1.0, specificity: Specificity::BOUNDED }
  end

  if COMPACT_DATE_PATTERN.match?(segment)
    y = segment[0, 4].to_i
    m = segment[4, 2].to_i
    d = segment[6, 2].to_i
    if y.between?(1900, 2100) && m.between?(1, 12) && d.between?(1, 31)
      return { type: :date, confidence: 1.0, specificity: Specificity::STRUCTURED }
    end
  end

  { type: :integer, confidence: 1.0, specificity: Specificity::TYPED }
end