Class: QED::Patterns

Inherits:
Object
  • Object
show all
Defined in:
lib/qed/advice/patterns.rb

Overview

Pattern Advice (When)

This class encapsulates “When” advice on plain text.

Matches are evaluated in Scope context, via #instance_exec, so that the advice methods will have access to the same scope as the demonstrandum themselves.

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Patterns

Returns a new instance of Patterns.



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# File 'lib/qed/advice/patterns.rb', line 15

def initialize
  @when = []
end

Instance Attribute Details

#when ⇒ Object (readonly)

Returns the value of attribute when.



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# File 'lib/qed/advice/patterns.rb', line 13

def when
  @when
end

Instance Method Details

#add(patterns, &procedure) ⇒ Object 



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# File 'lib/qed/advice/patterns.rb', line 20

def add(patterns, &procedure)
  @when << [patterns, procedure]
end

#call(scope, section) ⇒ Object 



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# File 'lib/qed/advice/patterns.rb', line 25

def call(scope, section)
  match = section.text
  args  = section.args

  @when.each do |(patterns, proc)|
    compare = match
    matched = true
    params  = []
    patterns.each do |pattern|
      case pattern
      when Regexp
        regex = pattern
      else
        regex = when_string_to_regexp(pattern)
      end
      if md = regex.match(compare)
        params.concat(md[1..-1])
        compare = md.post_match
      else
        matched = false
        break
      end
    end
    if matched
      params += args
      #proc.call(*params)
      scope.instance_exec(*params, &proc)
    end
  end
end