Class: Surveyor::Parser

Inherits:
Object
  • Object
show all
Defined in:
lib/surveyor/parser.rb

Class Attribute Summary collapse

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Parser

Instance methods



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# File 'lib/surveyor/parser.rb', line 55

def initialize
  self.context = {}
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(missing_method, *args, &block) ⇒ Object

This method_missing does all the heavy lifting for the DSL



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# File 'lib/surveyor/parser.rb', line 63

def method_missing(missing_method, *args, &block)
  method_name, reference_identifier = missing_method.to_s.split("_", 2)
  type = full(method_name)
  Surveyor::Parser.raise_error( "\"#{type}\" is not a surveyor method." )if !%w(survey survey_translation survey_section question_group question dependency dependency_condition answer validation validation_condition).include?(type)

  Surveyor::Parser.rake_trace(reference_identifier.blank? ? "#{type} #{args.map(&:inspect).join ', '}" : "#{type}_#{reference_identifier} #{args.map(&:inspect).join ', '}",
                              block_models.include?(type) ? 2 : 0)

  # check for blocks
  Surveyor::Parser.raise_error "A #{type.humanize.downcase} should take a block" if block_models.include?(type) && !block_given?
  Surveyor::Parser.raise_error "A #{type.humanize.downcase} doesn't take a block" if !block_models.include?(type) && block_given?

  # parse and build
  type.classify.constantize.new.extend("SurveyorParser#{type.classify}Methods".constantize).parse_and_build(context, args, method_name, reference_identifier)

  # evaluate and clear context for block models
  if block_models.include?(type)
    self.instance_eval(&block)
    if type == 'survey'
      resolve_dependency_condition_references
      resolve_question_correct_answers
      report_lost_and_duplicate_references
      Surveyor::Parser.rake_trace("", -2)
      if context[:survey].save
        Surveyor::Parser.rake_trace "Survey saved."
      else
        Surveyor::Parser.raise_error "Survey not saved: #{context[:survey].errors.full_messages.join(", ")}"
      end
    else
      Surveyor::Parser.rake_trace("", -2)
      context[type.to_sym].clear(context)
    end
  end
end

Class Attribute Details

.log ⇒ Object

Returns the value of attribute log.



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# File 'lib/surveyor/parser.rb', line 5

def log
  @log
end

.options ⇒ Object

Returns the value of attribute options.



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# File 'lib/surveyor/parser.rb', line 5

def options
  @options
end

Instance Attribute Details

#context ⇒ Object

Attributes



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# File 'lib/surveyor/parser.rb', line 8

def context
  @context
end

Class Method Details

.ensure_attrs ⇒ Object 



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# File 'lib/surveyor/parser.rb', line 19

def self.ensure_attrs
  self.options ||= {}
  self.log ||= {}
  self.log[:indent] ||= 0
  self.log[:source] ||= ""
end

.parse(str, options = {}) ⇒ Object

Class methods



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# File 'lib/surveyor/parser.rb', line 11

def self.parse(str, options={})
  self.ensure_attrs
  self.options = options
  self.log[:source] = str
  Surveyor::Parser.rake_trace "\n"
  Surveyor::Parser.new.parse(str)
  Surveyor::Parser.rake_trace "\n"
end

.raise_error(str, skip_trace = false) ⇒ Object

Raises:



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# File 'lib/surveyor/parser.rb', line 46

def self.raise_error(str, skip_trace = false)
  self.ensure_attrs
  line =  caller[1].split('/').last.split(':')[1].to_i

  raise Surveyor::ParserError, "#{str}\n" if skip_trace
  raise Surveyor::ParserError, "#{self.source_extract(line)}\nline \##{line}: #{str}\n"
end

.rake_trace(str, indent_increment = 0) ⇒ Object 



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# File 'lib/surveyor/parser.rb', line 25

def self.rake_trace(str, indent_increment=0)
  self.ensure_attrs
  unless str.blank?
    puts "#{' ' * self.log[:indent]}#{str}" if self.options[:trace] == true
  end
  self.log[:indent] += indent_increment
end

.source_extract(line) ⇒ Object

from github.com/rails/rails/blob/master/actionpack/lib/action_view/template/error.rb#L81



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# File 'lib/surveyor/parser.rb', line 33

def self.source_extract(line)
  source_code = self.log[:source].split("\n")
  radius = 3
  start_on_line = [ line - radius - 1, 0 ].max
  end_on_line   = [ line + radius - 1, source_code.length].min

  return unless source_code = source_code[start_on_line..end_on_line]
  line_counter = start_on_line
  source_code.sum do |line|
    line_counter += 1
    "#{line_counter}: #{line}\n"
  end
end

Instance Method Details

#parse(str) ⇒ Object 



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# File 'lib/surveyor/parser.rb', line 58

def parse(str)
  instance_eval(str)
  return context[:survey]
end