Class: QED::Parser

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

Overview

The parser breaks down a demonstandum into structured object to passed thru the script evaluator.

Technically is defines it’s own markup language but for interoperability sake it …

Defined Under Namespace

Classes: CodeSection, Section, TextSection

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(file) ⇒ Parser

Returns a new instance of Parser.



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# File 'lib/qed/parser.rb', line 12

def initialize(file)
  @lines = File.readlines(file).to_a
  @ast = []
end

Instance Attribute Details

#ast ⇒ Object (readonly)

Returns the value of attribute ast.



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# File 'lib/qed/parser.rb', line 18

def ast
  @ast
end

Instance Method Details

#add_section(state, text, lineno) ⇒ Object 



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# File 'lib/qed/parser.rb', line 53

def add_section(state, text, lineno)
  case state
  when :code
    if ast.last.raw?
      @ast.last << text #clean_quote(text)
    else
      @ast << CodeSection.new(text, lineno)
    end
  else
    @ast << TextSection.new(text, lineno)
    #cont = (/\.\.\.\s*^/ =~ text ? true : false)
  end
end

#parse ⇒ Object 



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# File 'lib/qed/parser.rb', line 21

def parse
  state = :text
  linein = 0

  text  = ''

  @lines.each_with_index do |line, lineno|
    if /^\S/ =~ line
      if state == :code
        add_section(:code, text, linein)
        linein = lineno
        text = ''
      end
      state = :text
      text << line          
    else
      if state == :text
        next if text.strip.empty?
        add_section(:text, text, linein)
        linein = lineno
        text = ''
      end
      state = :code
      text << line          
    end
  end
  add_section(state, text, linein)
  @ast.reject!{ |sect| sect.type == :code && sect.text.strip.empty? }
  return @ast
end