Module: Facwparser::Parser

Defined in:
lib/facwparser/parser.rb

Constant Summary collapse

SPECIAL_CHARACTERS_REGEX = 
%w( [ ] \\ * + _ ? { } ! ^ ~ - ).map{|e| Regexp.escape(e)}.join

Class Method Summary collapse

Class Method Details

.add_headings_to_toc(elements, options) ⇒ Object 



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# File 'lib/facwparser/parser.rb', line 24

def self.add_headings_to_toc(elements, options)
  tocs = elements.select{ |e| e.is_a?(Element::TocMacro)}
  if !tocs.empty?
    headings = elements.select{ |e| e.is_a?(Element::Heading) && e.level == 1}
    id = 0
    headings.each { |h|
      h.id = 'heading_' + id.to_s
      id += 1
    }
    tocs.each {|t| t.headings = headings }
  end
  elements
end

.add_list_elements(elements, options) ⇒ Object 



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# File 'lib/facwparser/parser.rb', line 38

def self.add_list_elements(elements, options)
  processed = []
  list_stack = []
  elements.each { |e|
    case
    when e.is_a?(Element::ListItem)
      while list_stack.size > e.level
        list_stack.pop
      end
      while list_stack.size < e.level
        list = Element::List.new(e.symbols[list_stack.size])
        if list_stack.empty?
          processed << list
        else
          list_stack[-1].push list
        end
        list_stack << list
      end
      list_stack[-1].push e
    else
      list_stack.clear if list_stack.size > 0
      processed << e
    end
  }
  processed
end

.add_table_elements(elements, options) ⇒ Object 



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# File 'lib/facwparser/parser.rb', line 65

def self.add_table_elements(elements, options)
  processed = []
  table = nil
  elements.each { |e|
    if e.is_a?(Element::TableRow)
      if e.is_a?(Element::TableHeaders) || !table
        table = Element::Table.new
        processed << table
      end
      table.push e
    else
      table = nil
      processed << e
    end
  }
  processed
end

.parse(content, options = {}) ⇒ Object 



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

def self.parse(content, options = {})
  elements = parse_block(content, options)
  process_elements(elements, options)
end

.parse_block(content, options) ⇒ Object 



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# File 'lib/facwparser/parser.rb', line 83

def self.parse_block(content, options)
  s = StringScanner.new(content.gsub("\r", '').gsub(/[\t\f]/, ' ') + "\n")

  elements = []

  p = nil

  while s.rest?
    case
    when s.scan(/h(\d)\. +(.+)\n/)
      p = nil
      elements << Element::Heading.new(s[0], s[1].to_i, s[2])
    when s.scan(/----+\n/)
      p = nil
      elements << Element::HorizontalRule.new(s[0])
    when s.scan(/([*\-#]+) +(.+)\n/)
      p = nil
      elements << Element::ListItem.new(s[0], s[1], s[2])
    when s.scan(/(\|\|.+\|\|) *\n/)
      p = nil
      elements << Element::TableHeaders.new(s[0], s[1])
    when s.scan(/(\|.+\|) *\n/)
      p = nil
      elements << Element::TableData.new(s[0], s[1])
    when s.scan(/\{toc(:.*)?\} *\n/)
      p = nil
      elements << Element::TocMacro.new(s[0], s[1] ? s[1][1,] : nil)
    when s.scan(/\{noformat\} *\n(?m)(.+?\n)\{noformat\} *\n/)
      p = nil
      elements << Element::NoformatMacro.new(s[0], s[1])
    when s.scan(/\{code(:.*?)?\} *\n(?m)(.+?\n)\{code\} *\n/)
      p = nil
      elements << Element::CodeMacro.new(s[0], s[1], s[2])
    when s.scan(/\{quote\} *\n(?m)(.+?\n)\{quote\} *\n/)
      p = nil
      elements << Element::QuoteMacro.new(s[0], s[1])
    when s.scan(/ *\n/)
      p = nil
      elements << Element::Nop.new(s[0])
    when s.scan(/(.+)\n/)
      if p
        p.append(s[0])
      else
        p = Element::P.new(s[0])
        elements << p
      end
    else
      raise "Parse Error. line=#{s.rest}"
    end
  end
  elements
end

.parse_value(value, options) ⇒ Object 



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# File 'lib/facwparser/parser.rb', line 142

def self.parse_value(value, options)

  children = []

  value.split("\n").each { |l|
    s = StringScanner.new(l)
    while s.rest?
      case
      when s.scan(/\[(.+?)(?<!\\)\]/)
        children << Element::A.new(s[0], unescape_text(s[1]))
      when s.scan(/\*(.+?)(?<!\\)\*/)
        children << Element::Strong.new(s[0], unescape_text(s[1]))
      when s.scan(/\_(.+?)(?<!\\)\_/)
        children << Element::Emphasis.new(s[0], unescape_text(s[1]))
      when s.scan(/\-(.+?)(?<!\\)\-/)
        children << Element::Strike.new(s[0], unescape_text(s[1]))
      when s.scan(/\+(.+?)(?<!\\)\+/)
        children << Element::Under.new(s[0], unescape_text(s[1]))
      when s.scan(/\^(.+?)(?<!\\)\^/)
        children << Element::Sup.new(s[0], unescape_text(s[1]))
      when s.scan(/\~(.+?)(?<!\\)\~/)
        children << Element::Sub.new(s[0], unescape_text(s[1]))
      when s.scan(/\?\?(.+?)(?<!\\)\?\?/)
        children << Element::Q.new(s[0], unescape_text(s[1]))
      when s.scan(/\{\{(.+?)(?<!\\)\}\}/)
        children << Element::Monospace.new(s[0], unescape_text(s[1]))
      when s.scan(/\!(https?:(?:.+?))(?<!\\)\!/)
        children << Element::Image.new(s[0], unescape_text(s[1]))
      when s.scan(/\!(\/(?:.+?))(?<!\\)\!/)
        children << Element::Image.new(s[0], unescape_text(s[1]))
      when s.scan(/\{jira:(.+?)(?<!\\)\}/)
        children << Element::JiraMacro.new(s[0], unescape_text(s[1]))
      when s.scan(/\{color:(.+?)(?<!\\)\}/)
        children << Element::ColorMacroStart.new(s[0], unescape_text(s[1]))
      when s.scan(/\{color\}/)
        children << Element::ColorMacroEnd.new(s[0])
      when s.scan(/\\\\/)
        children << Element::Br.new(s[0])
      when s.scan(/\\([#{SPECIAL_CHARACTERS_REGEX}])/o)
        children << Element::Text.new(s[0], s[1])
      when s.scan(/[^#{SPECIAL_CHARACTERS_REGEX}]+/o)
        children << Element::Text.new(s[0], unescape_text(s[0]))
      else
        children << Element::Text.new(s.rest, unescape_text(s.rest))
        break
      end
    end
  }

  children
end

.process_elements(elements, options) ⇒ Object 



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# File 'lib/facwparser/parser.rb', line 17

def self.process_elements(elements, options)
  processed = add_list_elements(elements, options)
  processed = add_table_elements(processed, options)
  processed = add_headings_to_toc(processed, options)
  processed
end

.unescape_text(text) ⇒ Object 



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# File 'lib/facwparser/parser.rb', line 136

def self.unescape_text(text)
  text.gsub(/\\([#{SPECIAL_CHARACTERS_REGEX}])/o) {
    $1
  }
end