Class: Mustache::Parser

Inherits:
Object
  • Object
show all
Defined in:
lib/ext/mustache.rb

Instance Method Summary collapse

Instance Method Details

#scan_tags ⇒ Object 



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# File 'lib/ext/mustache.rb', line 20

def scan_tags
  # Scan until we hit an opening delimiter.
  start_of_line = @scanner.beginning_of_line?
  pre_match_position = @scanner.pos
  last_index = @result.length

  return unless x = @scanner.scan(/([ \t]*)?#{Regexp.escape(otag)}/)
    padding = @scanner[1] || ''

  # Don't touch the preceding whitespace unless we're matching the start
  # of a new line.
  unless start_of_line
    @result << [:static, padding] unless padding.empty?
    pre_match_position += padding.length
    padding = ''
  end

  # Since {{= rewrites ctag, we store the ctag which should be used
  # when parsing this specific tag.
  current_ctag = self.ctag
  type = @scanner.scan(/#|\^|\/|=|!|<|>|&|\{/)
  @scanner.skip(/\s*/)

  # ANY_CONTENT tags allow any character inside of them, while
  # other tags (such as variables) are more strict.
  if ANY_CONTENT.include?(type)
    r = /\s*#{regexp(type)}?#{regexp(current_ctag)}/
      content = scan_until_exclusive(r)
  else
    content = @scanner.scan(ALLOWED_CONTENT)
  end

  # We found {{ but we can't figure out what's going on inside.
  error "Illegal content in tag" if content.empty?

  fetch = [:mustache, :fetch, content.split('.')]
  prev = @result

  # Based on the sigil, do what needs to be done.
  case type
  when '#'
    block = [:multi]
    @result << [:mustache, :section, fetch, block]
    @sections << [content, position, @result]
    @result = block
  when '^'
    block = [:multi]
    @result << [:mustache, :inverted_section, fetch, block]
    @sections << [content, position, @result]
    @result = block
  when '/'
    section, pos, result = @sections.pop
    raw = @scanner.pre_match[pos[3]...pre_match_position] + padding
    (@result = result).last << raw << [self.otag, self.ctag]

    if section.nil?
      error "Closing unopened #{content.inspect}"
    elsif section != content
      error "Unclosed section #{section.inspect}", pos
    end
  when '!'
    # ignore comments
  when '='
    self.otag, self.ctag = content.split(' ', 2)
  when '>'
    @result << [:mustache, :partial, content, padding]
  when '<'
    @result << [:mustache, :routes, content, padding]
  when '{', '&'
    # The closing } in unescaped tags is just a hack for
    # aesthetics.
    type = "}" if type == "{"
    @result << [:mustache, :utag, fetch]
  else
    @result << [:mustache, :etag, fetch]
  end

  # Skip whitespace and any balancing sigils after the content
  # inside this tag.
  @scanner.skip(/\s+/)
  @scanner.skip(regexp(type)) if type

  # Try to find the closing tag.
  unless close = @scanner.scan(regexp(current_ctag))
    error "Unclosed tag"
  end

  # If this tag was the only non-whitespace content on this line, strip
  # the remaining whitespace.  If not, but we've been hanging on to padding
  # from the beginning of the line, re-insert the padding as static text.
  if start_of_line && !@scanner.eos?
    if @scanner.peek(2) =~ /\r?\n/ && SKIP_WHITESPACE.include?(type)
      @scanner.skip(/\r?\n/)
    else
      prev.insert(last_index, [:static, padding]) unless padding.empty?
    end
  end

  # Store off the current scanner position now that we've closed the tag
  # and consumed any irrelevant whitespace.
  @sections.last[1] << @scanner.pos unless @sections.empty?

  return unless @result == [:multi]
end