Module: Emfsvg::Svg::Parser

Defined in:
lib/emfsvg/svg/parser.rb

Overview

Parses an SVG document string into a Svg::Document value object. Nokogiri is the only XML/HTML parser used in this gem.

Width/height are coerced to floats (CSS units other than px are out of scope for v1; a numeric value is treated as user units). viewBox is parsed into a 4-tuple [min_x, min_y, width, height].

Class Method Summary collapse

Class Method Details

.call(string) ⇒ Object

Raises:



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# File 'lib/emfsvg/svg/parser.rb', line 16

def call(string)
  doc = Nokogiri::XML(string, &:noblanks)
  root = doc.root
  raise ParseError, "not an SVG document: missing root element" unless root

  Document.new(
    width: parse_dimension(root["width"]),
    height: parse_dimension(root["height"]),
    view_box: parse_view_box(root["viewBox"]),
    root_element: Element.from_node(root)
  )
end

.parse_dimension(value) ⇒ Object 



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# File 'lib/emfsvg/svg/parser.rb', line 29

def parse_dimension(value)
  return 0.0 if value.nil? || value.empty?

  match = value.match(/\A(-?\d+(?:\.\d+)?)/)
  match ? match[1].to_f : 0.0
end

.parse_view_box(value) ⇒ Object 



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# File 'lib/emfsvg/svg/parser.rb', line 36

def parse_view_box(value)
  return nil if value.nil? || value.empty?

  parts = value.split(/[\s,]+/).map(&:to_f)
  parts.length == 4 ? parts : nil
end