Module: Zafu::ParsingRules

Defined in:
lib/zafu/parsing_rules.rb

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Instance Attribute Details

#context ⇒ Object (readonly)

The context informs the rendering element about the current Node, node class, existing ids, etc. The context is inherited by sub-elements.



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# File 'lib/zafu/parsing_rules.rb', line 7

def context
  @context
end

#helper ⇒ Object (readonly)

The helper is used to connect the compiler to the world of the application (read/write templates, access traductions, etc)



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# File 'lib/zafu/parsing_rules.rb', line 10

def helper
  @helper
end

#markup ⇒ Object

The markup (of class Markup) holds information on the tag (<li>), tag attributes (.. class=‘foo’) and indentation information that should be used when rendered. This context is not inherited.



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# File 'lib/zafu/parsing_rules.rb', line 14

def markup
  @markup
end

#sub_do ⇒ Object (readonly)

We need this flag to detect cases like <r:with part=‘list’ do=‘other list finder’/>



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# File 'lib/zafu/parsing_rules.rb', line 17

def sub_do
  @sub_do
end

Class Method Details

.included(base) ⇒ Object 



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# File 'lib/zafu/parsing_rules.rb', line 19

def self.included(base)
  base.before_parse :remove_erb
  base.before_process :unescape_ruby
end

Instance Method Details

#add_block(text_or_opts, at_start = false) ⇒ Object

Helper during compilation to make a block



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# File 'lib/zafu/parsing_rules.rb', line 309

def add_block(text_or_opts, at_start = false)
  # avoid wrapping objects in [void][/void]
  bak = @blocks
    @blocks = []
    if text_or_opts.kind_of?(String)
      new_blocks = make(:void, :method => 'void', :text => text_or_opts).blocks
    else
      new_blocks = [make(:void, text_or_opts)]
    end
    if at_start
      bak = new_blocks + bak
    else
      bak += new_blocks
    end
  @blocks = bak
  # Force descendants rebuild
  @all_descendants = nil
end

#extract_name ⇒ Object 



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# File 'lib/zafu/parsing_rules.rb', line 95

def extract_name
  @options[:name] ||
  (%w{input select textarea}.include?(@method) ? nil : @params[:name]) ||
  @markup.params[:id] ||
  @params[:id]
end

#remove_erb(text) ⇒ Object 



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# File 'lib/zafu/parsing_rules.rb', line 102

def remove_erb(text)
  text.gsub('<%', '&lt;%').gsub('%>', '%&gt;').gsub(/<\Z/, '&lt;')
end

#scan ⇒ Object

scan rules



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# File 'lib/zafu/parsing_rules.rb', line 127

def scan
  # puts "SCAN(#{@method}): [#{@text}]"
  if @text =~ %r{\A([^<]*?)(\s*)//!}m
    # comment
    flush $1
    eat $2
    scan_comment
  elsif @text =~ /\A([^<]*?)(^ *|)</m
    flush $1
    eat $2
    if @text[1..1] == '/'
      store $2
      scan_close_tag
    elsif @text[0..3] == '<!--'
      scan_html_comment(:space_before=> $2)
    elsif @text[0..8] == '<![CDATA['
      flush '<![CDATA['
    else
      scan_tag(:space_before=> $2)
    end
  else
    # no more tags
    flush
  end
end

#scan_asset ⇒ Object 



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# File 'lib/zafu/parsing_rules.rb', line 261

def scan_asset
  # puts "ASSET(#{object_id}) [#{@text}]"
  if @text =~ /\A<(\w+)([^>]*?)(\/?)>/
    eat $&
    @method = 'rename_asset'
    @markup.tag = $1
    @end_tag = $1
    closed = ($3 != '')
    @params = Markup.parse_params($2)
    if closed
      leave(:asset)
    elsif @markup.tag == 'script'
      enter(:void)
    else
      enter(:inside_asset)
    end
  else
    # error
    @method = 'void'
    flush
  end
end

#scan_close_tag ⇒ Object 



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# File 'lib/zafu/parsing_rules.rb', line 153

def scan_close_tag
  if @text =~ /\A<\/([^>]+)>( *\n+|)/m
    # puts "CLOSE:[#{$&}]}" # ztag
    # closing tag
    if $1 == @end_tag
      @end_tag_count -= 1
      if @end_tag_count == 0
        eat $&

        @markup.space_after = $2
        leave
      else
        # keep the tag (false alert)
        flush $&
      end
    elsif $1[0..1] == 'r:'
      # /rtag
      eat $&
      if $1 != @end_tag
        # error bad closing rtag
        store "<span class='parser_error'>#{$&.gsub('<', '&lt;').gsub('>','&gt;')} should be &lt;/#{@end_tag}&gt;</span>"
      end
      leave
    else
      # other html tag closing
      flush $&
    end
  else
    # error
    flush
  end
end

#scan_comment ⇒ Object 



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# File 'lib/zafu/parsing_rules.rb', line 200

def scan_comment
  if @text =~ %r{\A//!.*(\n|\Z)}
    # zafu html escaped
    eat $&
  else
    # error
    flush
  end
end

#scan_html_comment(opts = {}) ⇒ Object 



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# File 'lib/zafu/parsing_rules.rb', line 186

def scan_html_comment(opts={})
  if @text =~ /\A<!--\|(.*?)-->/m
    # zafu html escaped
    eat $&
    @text = opts[:space_before] + $1 + @text
  elsif @text =~ /\A<!--.*?-->/m
    # html comment
    flush $&
  else
    # error
    flush
  end
end

#scan_inside_asset ⇒ Object 



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# File 'lib/zafu/parsing_rules.rb', line 284

def scan_inside_asset
  if @text =~ /\A(.*?)<\/#{@end_tag.gsub('?', '\\?')}>/m
    eat $&
    store $1
    leave(:asset)
  else
    # never ending asset
    flush
  end
end

#scan_style ⇒ Object 



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# File 'lib/zafu/parsing_rules.rb', line 295

def scan_style
  if @text =~ /\A(.*?)<\/style>/m
    flush $&
    @method = 'rename_asset'
    @markup.tag = 'style'
    leave(:style)
  else
    # error
    @method = 'void'
    flush
  end
end

#scan_tag(opts = {}) ⇒ Object 



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# File 'lib/zafu/parsing_rules.rb', line 210

def scan_tag(opts={})
  #puts "TAG(#{@method}): [#{@text}]"
  if @text =~ /\A<r:([\w_]+\??)([^>]*?)(\/?)>/
    #puts "RTAG:#{$~.to_a.inspect}" # ztag
    eat $&
    opts.merge!(:method=>$1, :params=>$2)
    opts.merge!(:text=>'') if $3 != ''
    make(:void, opts)
  #elsif @text =~ /\A<(\w+)([^>]*?)do\s*=('([^>]*?[^\\]|)'|"([^>]*?[^\\]|)")([^>]*?)(\/?)>/
  elsif @text =~ /\A<(\w+)([^>]*?)do\s*=('|")([^\3]*?[^\\]|)\3([^>]*?)(\/?)>/
    #puts "DO:#{$~.to_a.inspect}" # do tag
    eat $&
    reg = $~
    opts.merge!(:method=> reg[4].gsub("\\#{reg[3]}", reg[3]), :html_tag=>reg[1], :html_tag_params=>reg[2], :params=>reg[5])
    opts.merge!(:text=>'') if reg[6] != ''
    make(:void, opts)
  elsif @text =~ /\A<(\w+)(([^>]*?)\#\{([^>]*?))(\/?)>/
    # html tag with dynamic params
    #puts "OTHER_DYN:[#{$&}]"

    eat $&
    opts.merge!(:method => 'void', :html_tag => $1, :html_tag_params => $2, :params => {})
    opts.merge!(:text=>'') if $5 != ''
    make(:void, opts)
  elsif @text =~ /\A<(\w+)([^>]*?)id\s*=('[^>]*?[^\\]'|"[^>]*?[^\\]")([^>]*?)(\/?)>/
    #puts "ID:#{$~.to_a.inspect}" # id tag
    eat $&
    opts.merge!(:method=>'void', :html_tag=>$1, :params=>{:id => $3[1..-2]}, :html_tag_params=>"#{$2}id=#{$3}#{$4}")
    opts.merge!(:text=>'') if $5 != ''
    make(:void, opts)
  elsif @end_tag && @text =~ /\A<#{@end_tag.gsub('?', '\\?')}([^>]*?)(\/?)>/
    #puts "SAME:#{$~.to_a.inspect}" # simple html tag same as end_tag
    flush $&
    @end_tag_count += 1 unless $2 == '/'
  elsif @text =~ /\A<(link|img|script)/
    #puts "HTML:[#{$&}]" # html
    make(:asset)
  elsif @text =~ /\A<style>/
    flush $&
    make(:style)
  elsif @text =~ /\A[^>]*?>/
    # html tag
    #puts "OTHER:[#{$&}]"
    store opts[:space_before]
    flush $&
  else
    # never closed tag
    flush
  end
end

#single_child_method ⇒ Object 



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# File 'lib/zafu/parsing_rules.rb', line 115

def single_child_method
  return @single_child_method if defined?(@single_child_method)
  @single_child_method = if @blocks.size == 1
    single_child = @blocks[0]
    return nil if single_child.kind_of?(String)
    single_child.markup.tag ? nil : single_child.method
  else
    nil
  end
end

#start(mode) ⇒ Object

This callback is run just after the block is initialized (Parser#initialize).



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# File 'lib/zafu/parsing_rules.rb', line 25

def start(mode)
  # tag_context
  @markup = Markup.new(@options.delete(:html_tag))

  # html_tag
  if html_params = @options.delete(:html_tag_params)
    # FIXME: make a better parser so that we do not have to worry with '>' at all.
    @markup.params = html_params.gsub('&gt;', '>')
  end

  # end_tag is used to know when to close parsing in sub-do
  # Example:
  # <li do='each' do='images'>
  #   <ul>
  #     <li><r:link/></li> <!-- do not close outer LI now: @end_tag_count != 0 -->
  #   </ul>
  # </li> <!-- close outer LI now: @end_tag_count == 0 -->
  #
  @end_tag = @markup.tag || @options.delete(:end_tag) || "r:#{@method}"
  @end_tag_count  = 1

  # code indentation
  @markup.space_before = @options.delete(:space_before) # @space_before

  if @params =~ /\A([^>]*?)do\s*=('|")([^\2]*?[^\\])\2([^>]*)\Z/
    #puts $~.to_a.inspect
    # we have a sub 'do'
    params = $1
    sub_params = $4
    sub_method = $3.gsub("\\#{$2}", $2)

    @params = Markup.parse_params(params)

    # We need this flag to detect cases cases like <r:with part='list' do='other list finder'/>
    @sub_do = true

    opts = {:method => sub_method, :params => sub_params}

    # the matching zafu tag will be parsed by the last 'do', we must inform it to halt properly :
    opts[:end_tag] = @end_tag

    sub = make(:void, opts)
    @markup.space_after = sub.markup.space_after
    sub.markup.space_after = ""
  else
    @params = Markup.parse_params(@params)
  end

  # set name used for include/replace from html_tag if not already set by superclass
  @name = extract_name

  if !@markup.tag && (@markup.tag = @params.delete(:tag))
    # Extract html tag parameters from @params
    @markup.steal_html_params_from(@params)
  end

  if @method == 'include' && @params[:template]
    include_template
  elsif mode == :tag && !sub
    scan_tag
  elsif !sub
    enter(mode)
  end
end

#to_s ⇒ Object

Used to debug parser.



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# File 'lib/zafu/parsing_rules.rb', line 91

def to_s
  "[#{@method}#{@name.blank? ? '' : " '#{@name}'"}#{@params.empty? ? '' : " #{@params.map{|k,v| ":#{k}=>#{v.inspect}"}.join(', ')}"}]" + (@blocks||[]).join('') + "[/#{@method}]"
end

#unescape_ruby ⇒ Object 



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# File 'lib/zafu/parsing_rules.rb', line 106

def unescape_ruby
  @params.each do |k,v|
    v.gsub!('&gt;', '>')
    v.gsub!('&lt;', '<')
  end
  @method.gsub!('&gt;', '>')
  @method.gsub!('&lt;', '<')
end

#wrap_in_block(text_or_opts) ⇒ Object

Helper during compilation to wrap current content in a new block



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# File 'lib/zafu/parsing_rules.rb', line 329

def wrap_in_block(text_or_opts)
  # avoid wrapping objects in [void][/void]
  bak = @blocks
  @blocks = []
  if text_or_opts.kind_of?(String)
    wrapper = make(:void, :method => 'void', :text => text_or_opts)
  else
    wrapper = make(:void, text_or_opts)
  end
  wrapper.blocks = bak
  @blocks = [wrapper]
  # Force descendants rebuild
  @all_descendants = nil
end