Class: Markascend::LineUnit

Inherits:
Struct
  • Object
show all
Defined in:
lib/markascend/line_unit.rb,
lib/markascend/line_unit.rb

Overview

process a line with (maybe) a followed up indented block

Instance Attribute Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#block ⇒ Object

Returns the value of attribute block

Returns:

  • (Object) —

    the current value of block



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# File 'lib/markascend/line_unit.rb', line 2

def block
  @block
end

#env ⇒ Object

Returns the value of attribute env

Returns:

  • (Object) —

    the current value of env



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# File 'lib/markascend/line_unit.rb', line 2

def env
  @env
end

#line ⇒ Object

Returns the value of attribute line

Returns:

  • (Object) —

    the current value of line



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# File 'lib/markascend/line_unit.rb', line 2

def line
  @line
end

Instance Method Details

#parse(out = nil) ⇒ Object 



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# File 'lib/markascend/line_unit.rb', line 5

def parse out=nil
  @out = []
  @src = ::StringScanner.new line
  parsers = env.line_units
  while parsers.any?{|p| send p}
  end

  if out
    @out.each do |token|
      out << token
    end
  else
    @out.join
  end
end

#parse_auto_link ⇒ Object 



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# File 'lib/markascend/line_unit.rb', line 48

def parse_auto_link
  # TODO make protocol configurable
  if (s = @src.scan /(https|http|ftp|mailto)\:\/\/\S+/)
    s.gsub! /"/, '\\"'
    @out << '<a href="#{s}">'
    @out << (::Markascend.escape_html s)
    @out << '</a>'
    true
  end
end

#parse_bold_italic(emit = true) ⇒ Object 



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# File 'lib/markascend/line_unit.rb', line 136

def parse_bold_italic emit=true
  pos = @src.pos
  if s = @src.scan(/\*\*/)
    term = /\*\*/
    out = ['<b>']
    out_end = '</b>'
  elsif s = @src.scan(/\*/)
    term = /\*/
    out = ['<i>']
    out_end = '</i>'
  else
    return
  end

  loop do
    if res = @src.scan(/\\[\\\*]/)
      out << res[1]
    elsif @src.scan(term)
      out << out_end
      break
    elsif res = parse_bold_italic(false)
      out << res
    elsif res = parse_char(false)
      out << res
    else
      # failed
      @src.pos = pos
      return
    end
  end

  if emit
    @out << out.join
    true
  else
    out.join
  end
end

#parse_char(emit = true) ⇒ Object 



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# File 'lib/markascend/line_unit.rb', line 175

def parse_char emit=true
  # entity list generated by:
  # ruby -rregexp_optimized_union -e'puts Regexp.optimized_union($stdin.read.scan(/(?<=ENTITY )\w+/)).source' < tools/html4_entities.dtd
  # dtd from http://www.w3.org/TR/html4/sgml/entities.html
  if c = @src.scan(/
      &(?:
        n(?:bsp|ot|tilde)|i(?:excl|quest|grave|acute|circ|uml)|c(?:e(?:nt|dil)|urren|opy|cedil)|p(?:ound|lusmn|ara)|y(?:en|acute|uml)|brvbar|s(?:ect|hy|up[123]|zlig)|u(?:ml|grave|acute|circ|uml)|o(?:rd[fm]|grave|acute|circ|tilde|uml|slash)|laquo|r(?:eg|aquo)|m(?:acr|i(?:cro|ddot))|d(?:eg|ivide)|a(?:c(?:ute|irc)|grave|acute|tilde|uml|ring|elig)|frac(?:1[24]|34)|A(?:grave|acute|circ|tilde|uml|ring|Elig)|Ccedil|E(?:grave|acute|circ|uml|TH)|I(?:grave|acute|circ|uml)|Ntilde|O(?:grave|acute|circ|tilde|uml|slash)|t(?:imes|horn)|U(?:grave|acute|circ|uml)|Yacute|THORN|e(?:grave|acute|circ|uml|th)
        |\#\d{4}
        |\#x\h{4}
      );
    /x)
  elsif c = @src.scan(/\\\W/)
    c = ::Markascend.escape_html c[1]
  elsif c = @src.scan(/\n/)
    c = :'<br>'
  elsif c = @src.scan(/./)
    c = ::Markascend.escape_html c
  else
    return
  end

  if emit
    @out << c
    true
  else
    c
  end
end

#parse_inline_code ⇒ Object

the same as markdown



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# File 'lib/markascend/line_unit.rb', line 22

def parse_inline_code
  if s = @src.scan(/
      (`{1,})(\ ?)
      .*?
      \2\1
    /x)
    s =~ /^
      (`{1,})(\ ?)
      (.*?)
      \2\1
    $/x
    @out << (::Markascend.hilite $3, env.hi, true)
    true
  end
end

#parse_link ⇒ Object 



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# File 'lib/markascend/line_unit.rb', line 74

def parse_link
  pos = @src.pos
  return unless @src.scan(/\[/)

  footnote = @src.scan(/[\.\:]/)
  content = ''
  loop do
    if res = @src.scan(/\]/)
      break
    elsif res = parse_char(false)
      content << res
    else
      # failed
      @src.pos = pos
      return
    end
  end

  if footnote and env.sandbox
    scan_lexical_parens || scan_recursive_braces
    @out << ::Markascend.escape_html(@src.string[pos..(@src.pos)])
    return true
  end

  case footnote
  when '.'
    unless explain = scan_lexical_parens || scan_recursive_braces
      @src.pos = pos
      return
    end

    footnotes = env.footnotes
    if content =~ /\A\s*\z/
      content = footnotes.size + 1
    end
    raise "Already defined footnote: #{content}" if footnotes.has_key?(content)
    footnotes[content] = explain
    # TODO id prefix configurable
    @out << %Q|<a href="#footnote-#{footnotes.size}">#{content}</a>|
    true
  when ':'
    footnotes = env.footnotes
    if content =~ /\A\s*(\d+)\s*\z/
      @out << [:footnote_id_ref, $1.to_i]
    else
      content.strip!
      @out << [:footnote_acronym_ref, content]
    end
    true
  else
    if addr = scan_lexical_parens || scan_recursive_braces
      # TODO smarter addr to recognize things like a.b.com
      addr = ::Markascend.escape_attr addr
      @out << %Q|<a href="#{addr}">#{content}</a>|
      true
    else
      @src.pos = pos
      nil
    end
  end
end

#parse_macro ⇒ Object 



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# File 'lib/markascend/line_unit.rb', line 59

def parse_macro
  start = @src.pos
  return unless macro = @src.scan(/\\(?!\d)\w+/)
  macro = macro[1..-1]
  if block = scan_lexical_parens
    inline_content = @src.string[start..(@src.pos)]
  elsif block = scan_recursive_braces
    inline_content = @src.string[start..(@src.pos)]
  else
    block = self.block
  end
  @out << ::Markascend::Macro.new(env, block, inline_content).parse(macro)
  true
end

#parse_math ⇒ Object

no escape chars, but \ and $ are treated as atomic parsing units



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# File 'lib/markascend/line_unit.rb', line 39

def parse_math
  if (s = @src.scan /\$(?:\\[\\\$]|[^\$])*\$/)
    @out << '<code class="math">'
    @out << (::Markascend.escape_html s[1...-1])
    @out << '</code>'
    true
  end
end

#scan_lexical_parens ⇒ Object

(…)



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# File 'lib/markascend/line_unit.rb', line 216

def scan_lexical_parens
  if s = @src.scan(/
      \(
        (?: \\ [\\\)] | [^\)] )+  # lexical rule
      \)
    /x)
    s[1...-1].gsub(/\\[\)\\]/){|x| x[1]}
  end
end

#scan_recursive_braces ⇒ Object

…



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# File 'lib/markascend/line_unit.rb', line 205

def scan_recursive_braces
  if s = @src.scan(/
      (?<braces> \{
        ([^\{]+ | \g<braces>)*  # recursive rule
      \})
    /x)
    s[1...-1]
  end
end