Class: IiifUrl

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

Constant Summary collapse

VERSION = 
"0.0.2"
@@base_url = 
""

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(params = {}) ⇒ IiifUrl

Returns a new instance of IiifUrl.



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# File 'lib/iiif_url.rb', line 7

def initialize(params={})
  @params = params
end

Class Method Details

.from_params(params = {}) ⇒ Object 



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# File 'lib/iiif_url.rb', line 49

def self.from_params(params={})
  base_url = params[:base_url]
  if base_url == false
    base_url = ''
  elsif base_url.nil?
    base_url = @@base_url
  end

  region = params[:region] || "full"
  if region.is_a? Hash
    if region[:x]
      region = "#{region[:x]},#{region[:y]},#{region[:w]},#{region[:h]}"
    elsif region[:pctx]
      region = "pct:#{region[:pctx]},#{region[:pcty]},#{region[:pctw]},#{region[:pcth]}"
    end
  end

  size = params[:size] || "full"
  if size.is_a? Hash
    if size[:w] || size[:h]
      size = "#{size[:w]},#{size[:h]}"
    elsif size[:pct]
      size = "pct:#{size[:pct]}"
    end
  end

  rotation = params[:rotation] || 0
  if rotation.is_a? Hash
    if rotation[:mirror]
      rotation = "!#{rotation[:degrees]}"
    else
      rotation = "#{rotation[:degrees]}"
    end
  end

  quality = params[:quality] || "default"
  format = params[:format] || "jpg"

  path = "/#{region}/#{size}/#{rotation}/#{quality}.#{format}"
  if params[:identifier]
    File.join(base_url, params[:identifier], path)
  else
    path
  end
end

.parse(url) ⇒ Object 



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# File 'lib/iiif_url.rb', line 95

def self.parse(url)
  url_parts = url.split('/')
  quality_format = url_parts.pop
  quality, format = quality_format.split('.')

  rotation_string = url_parts.pop
  rotation = if rotation_string.include?('!')
    degrees = rotation_string.sub('!', '')
    {degrees: degrees.to_i, mirror: true}
  else
    {degrees: rotation_string.to_i, mirror: false}
  end

  size_string = url_parts.pop
  size = if size_string.include?(',')
    w, h = size_string.split(',')
    w = w.to_i if !w.nil?
    h = h.to_i if !h.nil?
    {w: w, h: h}
  elsif size_string.include?('pct')
    pct, size = size_string.split(':')
    {pct: size.to_f}
  else
    size_string
  end

  region_string = url_parts.pop
  region = if region_string.include?(',')
    if region_string.include?('pct')
      pctx, pcty, pctw, pcth = region_string.split(',')
      pct, pctx = pctx.split(':')
      {pctx: pctx.to_f, pcty: pcty.to_f, pctw: pctw.to_f, pcth: pcth.to_f}
    else
      x, y, w, h = region_string.split(',')
      {x: x.to_i, y: y.to_i, w: w.to_i, h: h.to_i}
    end
  else
    region_string
  end

  identifier = url_parts.pop
  identifier = nil if identifier == ''

  {
    identifier: identifier,
    region: region,
    size: size,
    rotation: rotation,
    quality: quality,
    format: format
  }
end

.set_base_url(base_url) ⇒ Object 



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# File 'lib/iiif_url.rb', line 45

def self.set_base_url(base_url)
  @@base_url = base_url
end

Instance Method Details

#format(format) ⇒ Object 



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# File 'lib/iiif_url.rb', line 36

def format(format)
  @params[:format] = format
  self
end

#identifier(identifier) ⇒ Object 



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# File 'lib/iiif_url.rb', line 11

def identifier(identifier)
  @params[:identifier] = identifier
  self
end

#quality(quality) ⇒ Object 



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# File 'lib/iiif_url.rb', line 31

def quality(quality)
  @params[:quality] = quality
  self
end

#region(region) ⇒ Object 



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# File 'lib/iiif_url.rb', line 16

def region(region)
  @params[:region] = region
  self
end

#rotation(rotation) ⇒ Object 



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# File 'lib/iiif_url.rb', line 26

def rotation(rotation)
  @params[:rotation] = rotation
  self
end

#size(size) ⇒ Object 



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# File 'lib/iiif_url.rb', line 21

def size(size)
  @params[:size] = size
  self
end

#to_s ⇒ Object 



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# File 'lib/iiif_url.rb', line 41

def to_s
  IiifUrl.from_params(@params)
end