Class: PrawndownExt::Parser

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

Overview

Markdown to Prawn parser

Constant Summary collapse

MATCHERS = 
{
  #/^> (.+)/                  => '<quote>\1</quote>', # Quote
  /^# (.+)/                  => '<font size="HEADER1_SIZE"><b>\1</b></font>', # Header 1
  /^## (.+)/                 => '<font size="HEADER2_SIZE"><b>\1</b></font>', # Header 2
  /^### (.+)/                => '<font size="HEADER3_SIZE"><b>\1</b></font>', # Header 3
  /^#### (.+)/               => '<font size="HEADER4_SIZE"><b>\1</b></font>', # Header 4
  /^##### (.+)/              => '<font size="HEADER5_SIZE"><b>\1</b></font>', # Header 5
  /^###### (.+)/             => '<font size="HEADER6_SIZE"><b>\1</b></font>', # Header 6
  #/!\[([^\[]+)\]\(([^\)]+)\)/ => '<img href="\2" alt="\1">',        # Image
  /!\[([^\[]+)\]\(([^\)]+)\)/ => '',        # Images removed for now
  /<iframe ([^\[]+)<\/iframe>/ => '',        # Embeds are just removed
  /\[([^\[]+)\]\(([^\)]+)\)/ => '<link href="\2">\1</link>',        # Link
  /(\*\*|__)(.*?)\1/         => '<b>\2</b>',                        # Bold
  /(\*|_)(.*?)\1/            => '<i>\2</i>',                        # Italic
  /\~\~(.*?)\~\~/            => '<strikethrough>\1</strikethrough>' # Strikethrough
}

Instance Method Summary collapse

Constructor Details

#initialize(text, options) ⇒ Parser

Initialize a new Prawndown::Parser. text must a a valid Markdown string that only contains supported tags.

Supported tags are: Header 1-6, bold, italic, strikethrough and link.



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

def initialize(text, options)

  @text = text.to_s
	@header1_size = 28
	@header2_size = 24
	@header3_size = 20
	@header4_size = 18
	@header5_size = 16
	@header6_size = 14

	if !options.nil?
		if options.key?(:header1_size)
			@header1_size = options[:header1_size]
		end
		if options.key?(:header2_size)
			@header2_size = options[:header2_size]
		end
		if options.key?(:header3_size)
			@header3_size = options[:header3_size]
		end
		if options.key?(:header4_size)
			@header4_size = options[:header4_size]
		end
		if options.key?(:header5_size)
			@header5_size = options[:header5_size]
		end
		if options.key?(:header6_size)
			@header6_size = options[:header6_size]
		end
	end
	
end

Instance Method Details

#to_prawn ⇒ Object

Parses the Markdown text and outputs a Prawn compatible string



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# File 'lib/prawndown/parser.rb', line 59

def to_prawn

	# variable replacement
  _match = Marshal.load(Marshal.dump(MATCHERS))
  
  _match.each {
  	|x| puts 
  	x[1].gsub!("HEADER1_SIZE", @header1_size.to_s)
  	x[1].gsub!("HEADER2_SIZE", @header2_size.to_s)
  	x[1].gsub!("HEADER3_SIZE", @header3_size.to_s)
  	x[1].gsub!("HEADER4_SIZE", @header4_size.to_s)
  	x[1].gsub!("HEADER5_SIZE", @header5_size.to_s)
  	x[1].gsub!("HEADER6_SIZE", @header6_size.to_s)
  }

  result = _match.inject(@text) do |final_string, (markdown_matcher, prawn_tag)|
    final_string.gsub(markdown_matcher, prawn_tag)
  end
  

result
  
end