Class: LiquidPlus::Var

Inherits:
Object
  • Object
show all
Defined in:
lib/jekyll-liquid-plus/helpers/var.rb

Constant Summary collapse

SYNTAX = 
/(#{Liquid::VariableSignature}+)\s*(=|\+=|\|\|=)\s*(.*)\s*/o

Class Method Summary collapse

Class Method Details

.determine_value(vars, context) ⇒ Object 



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# File 'lib/jekyll-liquid-plus/helpers/var.rb', line 29

def determine_value(vars, context)
  vars.each do |var|
    rendered = var.render(context)
    return rendered unless rendered.nil?
  end
  nil
end

.get_value(vars, context) ⇒ Object 



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# File 'lib/jekyll-liquid-plus/helpers/var.rb', line 37

def get_value(vars, context)
  vars = vars.gsub(/ or /, ' || ')
  vars = vars.strip.split(/ \|\| /).map do |v|
    Liquid::Variable.new(v.strip)
  end
  determine_value(vars, context)
end

.parse(markup, context) ⇒ Object 



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# File 'lib/jekyll-liquid-plus/helpers/var.rb', line 8

def parse(markup, context)
  if markup = Conditional.parse(markup, context)
    if markup =~ SYNTAX
      @to = $1
      @operator = $2
      @from = $3

      value = get_value(@from, context)

      if @operator == '+=' and !context.scopes.last[@to].nil?
        context.scopes.last[@to] += value
      elsif @operator == '=' or (@operator == '||=' and context.scopes.last[@to].nil?)
        context.scopes.last[@to] = value
      end
      context
    else
      raise SyntaxError.new("Syntax Error in 'assign' - Valid syntax: assign [var] = [source]")
    end
  end
end