Module: Postsvg::Svg::AttributeParser

Defined in:
lib/postsvg/svg/attribute_parser.rb

Overview

Helpers for parsing presentation attributes into typed values. Used by Element.from_node factories.

Class Method Summary collapse

Class Method Details

.length(text) ⇒ Object

Parse a length attribute ("10", "10px", "10pt", "50%"). Returns a Float. Percentage values resolve to nil — the caller must know the reference dimension.



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# File 'lib/postsvg/svg/attribute_parser.rb', line 13

def length(text)
  return nil if text.nil? || text.empty?

  match = text.strip.match(/\A(-?\d+(?:\.\d+)?)(px|pt|in|cm|mm|em|ex|%)?\z/)
  return nil unless match

  return nil if match[2] == "%"

  value = match[1].to_f
  case match[2]
  when "pt" then value * (1.0 / 72.0) * 72.0 # PS uses points natively
  when "in" then value * 72.0
  when "cm" then value * (72.0 / 2.54)
  when "mm" then value * (72.0 / 25.4)
  else value
  end
end

.number(text, default: nil) ⇒ Object 



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# File 'lib/postsvg/svg/attribute_parser.rb', line 37

def number(text, default: nil)
  return default if text.nil? || text.empty?

  match = text.strip.match(/\A(-?\d+(?:\.\d+)?(?:[eE][-+]?\d+)?)\z/)
  match ? match[1].to_f : default
end

.number_list(text) ⇒ Object 



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# File 'lib/postsvg/svg/attribute_parser.rb', line 31

def number_list(text)
  return [] if text.nil? || text.empty?

  text.scan(/-?\d+(?:\.\d+)?(?:[eE][-+]?\d+)?/).map(&:to_f)
end