Class: Germinate::Selector

Inherits:
Object
  • Object
show all
Defined in:
lib/germinate/selector.rb

Constant Summary collapse

PATTERN = 
/^([@$])?(\w+)?(:([^\|]+))?(\|([\w|]+))?$/
EXCERPT_OUTPUT_PATTERN = 
/^([@$])?(\w+)?(\|([\w|]+))?(:([^\|]+))?$/
EXCERPT_PATTERN = 
%r{((-?\d+)|(/[^/]*/))(((\.\.\.?)|(,))((-?\d+)|(/[^/]*/)))?}

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(string, default_key = :unspecified, origin = "<Unknown>") ⇒ Selector

Returns a new instance of Selector.



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# File 'lib/germinate/selector.rb', line 17

def initialize(string, default_key=:unspecified, origin="<Unknown>")
  @string      = string
  @default_key = default_key
  @origin      = origin
  match_data = case string
               when "", nil then {}
               else 
                 if data = PATTERN.match(string) 
                   @excerpt_output = false
                 elsif data = EXCERPT_OUTPUT_PATTERN.match(string)
                   @excerpt_output = true
                 else
                   raise "Could not parse selector '#{string}'"
                 end
                 data
               end

  subscript_index = @excerpt_output ? 6 : 3
  pipeline_index  = @excerpt_output ? 4 : 6

  @selector_type = 
    case match_data[1]
    when "$" then :special
    when "@" then :code
    when nil then default_key == :unspecified ? :special : :code
    else raise "Unknown selector type '#{match_data[1]}'"
    end
  @key = match_data[2] || (default_key == :unspecified ? "SOURCE" : default_key)
  if match_data[subscript_index]
    @slice = true
    parse_excerpt(match_data[subscript_index])
  else
    @slice        = false
    @delimiter    = '..'
    @start_offset = 1
    @end_offset   = -1
    @length       = nil
  end
  @pipeline = String(match_data[pipeline_index]).
    split("|").unshift('_transform').uniq
end

Instance Attribute Details

#default_key ⇒ Object (readonly)

Returns the value of attribute default_key.



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# File 'lib/germinate/selector.rb', line 10

def default_key
  @default_key
end

#delimiter ⇒ Object (readonly)

Returns the value of attribute delimiter.



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# File 'lib/germinate/selector.rb', line 8

def delimiter
  @delimiter
end

#end_offset ⇒ Object (readonly)

Returns the value of attribute end_offset.



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# File 'lib/germinate/selector.rb', line 6

def end_offset
  @end_offset
end

#key ⇒ Object (readonly)

Returns the value of attribute key.



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# File 'lib/germinate/selector.rb', line 4

def key
  @key
end

#length ⇒ Object (readonly)

Returns the value of attribute length.



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# File 'lib/germinate/selector.rb', line 7

def length
  @length
end

#origin ⇒ Object (readonly)

Returns the value of attribute origin.



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# File 'lib/germinate/selector.rb', line 11

def origin
  @origin
end

#pipeline ⇒ Object (readonly)

Returns the value of attribute pipeline.



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# File 'lib/germinate/selector.rb', line 9

def pipeline
  @pipeline
end

#selector_type ⇒ Object (readonly)

Returns the value of attribute selector_type.



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# File 'lib/germinate/selector.rb', line 3

def selector_type
  @selector_type
end

#start_offset ⇒ Object (readonly)

Returns the value of attribute start_offset.



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# File 'lib/germinate/selector.rb', line 5

def start_offset
  @start_offset
end

#string ⇒ Object (readonly)

Returns the value of attribute string.



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# File 'lib/germinate/selector.rb', line 2

def string
  @string
end

Instance Method Details

#==(other) ⇒ Object 



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# File 'lib/germinate/selector.rb', line 86

def ==(other)
  string == other
end

#end_offset_for_slice ⇒ Object 



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# File 'lib/germinate/selector.rb', line 63

def end_offset_for_slice
  offset_for_slice(end_offset)
end

#excerpt_output? ⇒ Boolean

Should excerpting be done on the output of the process?

Returns:

  • (Boolean) 


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# File 'lib/germinate/selector.rb', line 68

def excerpt_output?
  @excerpt_output
end

#slice? ⇒ Boolean

Is it just a subset of the source hunk? (opposite of @whole?)

Returns:

  • (Boolean) 


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# File 'lib/germinate/selector.rb', line 73

def slice?
  @slice && !@excerpt_output
end

#start_offset_for_slice ⇒ Object 



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# File 'lib/germinate/selector.rb', line 59

def start_offset_for_slice
  offset_for_slice(start_offset)
end

#to_s ⇒ Object 



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# File 'lib/germinate/selector.rb', line 82

def to_s
  string + "(#{origin})"
end

#whole? ⇒ Boolean

Is it the entire hunk? (opposite of #slice?)

Returns:

  • (Boolean) 


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# File 'lib/germinate/selector.rb', line 78

def whole?
  !slice?
end