Class: General::GMeta

Inherits:
GTemplate show all
Defined in:
lib/gtemplates/gmeta.rb

Overview

Created: 1 - 31 - 2016

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from GTemplate

#match, #regex

Methods inherited from GBaseTemplate

#apply, #apply_all, #to_s

Constructor Details

#initialize(top, bottom, source = nil) ⇒ GMeta

Creates a new GMeta

Parameter: top - the top end of the meta (in preparts) Parameter: bottom - the bottom end of the data (in preparts) Parameter: source - the source of the file



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# File 'lib/gtemplates/gmeta.rb', line 95

def initialize top, bottom, source=nil
  @top    = top
  @bottom = bottom
  @source = source
end

Class Method Details

.load(path) ⇒ Object 



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# File 'lib/gtemplates/gmeta.rb', line 29

def self.load path
  # Read file

  string = IO.read path

  # Prepartial types

  ptypes = [
    General::GExtend,
    General::GInclude,
    General::GYield,
    General::GPretext
  ]

  # Breakdown algorithm

  preparts = []
  m = nil
  loop do
    # Match the front of the string to a preprocessor

    prepart = ptypes.find { |ptype| m = ptype::REGEX.match(string) }

    # Raise error if no matching prepart can be found

    if prepart.nil?
      raise GError.new "Unmatched prepartial at #{(string.length <= 5 ? string : string[0..5] + "...").inspect}"
    end

    # Add the partial to the array

    preparts << prepart.new(m)

    # Trim the front of the string

    string = string[m.end(0)..-1]

    # End when string is empty

    break if string.length == 0
  end

  # Find an extend

  extindex = preparts.index { |prepart| prepart.is_a? General::GExtend }

  # Run extend algorithm (throw error if extend is found elsewhere)

  if extindex == 0
    preparts = GMeta.load(preparts[extindex].filename+General::GIO::EXTENSION).gextend(preparts[1..-1])
  elsif !extindex.nil? && extindex > 0
    raise GError.new "@@extend prepartial needs to be at beginning of template."
  end

  # Check for multiple yields

  yields = preparts.find_all{ |prepart| prepart.is_a? General::GYield  }
  if yields.length > 1
    raise GError.new "@@yield prepartial can only appear ONCE!"
  end

  # Find the yield

  yindex = preparts.index{ |prepart| prepart.is_a? General::GYield }

  # Return a new meta file if yield is found. Else default is end.

  unless yindex.nil?
    return self.new preparts[0...yindex], preparts[(yindex + 1)..-1], path
  else
    return self.new preparts, [], path
  end
end

Instance Method Details

#gextend(preparts) ⇒ Object

Extends the given preparts from the GMeta

Parameter: preparts - the preparts array to extend

Returns: the extended preparts



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# File 'lib/gtemplates/gmeta.rb', line 106

def gextend preparts
  return @top + preparts + [General::GPretext.new("\r\n")] + @bottom
end