Class: Zafu::Parser

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

Constant Summary collapse

TEXT_CALLBACKS = 
%w{before_parse after_parse before_wrap wrap after_wrap after_process}
PROCESS_CALLBACKS = 
%w{before_process expander process_unknown}
CALLBACKS = 
TEXT_CALLBACKS + PROCESS_CALLBACKS
@@callbacks = 
{}

Instance Attribute Summary collapse

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(text, opts = {}) ⇒ Parser

Returns a new instance of Parser.



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# File 'lib/zafu/parser.rb', line 165

def initialize(text, opts={})
  @stack   = []
  @ok      = true
  @blocks  = []
  @errors  = []

  @options = {:mode=>:void, :method=>'void'}.merge(opts)
  @params  = @options.delete(:params) || {}
  @method  = @options.delete(:method)
  @ids     = @options[:ids] ||= {}
  original_ids = @ids.dup
  @defined_ids = {} # ids defined in this node or this node's sub blocks
  mode     = @options.delete(:mode)
  @parent  = @options.delete(:parent)

  if opts[:sub]
    @text = text
  else
    @text = before_parse(text)
    if part = opts[:part]
      # Optimization: try to find part from id
      if @text =~ /^(.*?)<[^<>]+id='#{part}'/m
        eat $1
      end
    end
  end

  start(mode)

  # set name
  @name ||= extract_name
  @options[:ids][@name] = self if @name

  unless opts[:sub]
    @text = after_parse(@text)
  end

  @ids.keys.each do |k|
    if original_ids[k] != @ids[k]
      @defined_ids[k] = @ids[k]
    end
  end
  @ok
end

Instance Attribute Details

#blocks ⇒ Object

Returns the value of attribute blocks.



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# File 'lib/zafu/parser.rb', line 27

def blocks
  @blocks
end

#defined_ids ⇒ Object

Returns the value of attribute defined_ids.



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# File 'lib/zafu/parser.rb', line 27

def defined_ids
  @defined_ids
end

#errors ⇒ Object

Returns the value of attribute errors.



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# File 'lib/zafu/parser.rb', line 27

def errors
  @errors
end

#ids ⇒ Object

Returns the value of attribute ids.



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# File 'lib/zafu/parser.rb', line 27

def ids
  @ids
end

#method ⇒ Object

Returns the value of attribute method.



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# File 'lib/zafu/parser.rb', line 27

def method
  @method
end

#name ⇒ Object

Returns the value of attribute name.



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# File 'lib/zafu/parser.rb', line 27

def name
  @name
end

#options ⇒ Object

Returns the value of attribute options.



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# File 'lib/zafu/parser.rb', line 27

def options
  @options
end

#params ⇒ Object

Method parameters “<r:show attr=‘name’/>” (params contains => ‘name’).



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# File 'lib/zafu/parser.rb', line 30

def params
  @params
end

#parent ⇒ Object

Returns the value of attribute parent.



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# File 'lib/zafu/parser.rb', line 27

def parent
  @parent
end

#pass(elems = nil) ⇒ Object

Pass some contextual information to siblings



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# File 'lib/zafu/parser.rb', line 224

def pass
  @pass
end

#text ⇒ Object

Returns the value of attribute text.



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# File 'lib/zafu/parser.rb', line 27

def text
  @text
end

Class Method Details

.erb_safe(text) ⇒ Object 



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# File 'lib/zafu/parser.rb', line 56

def erb_safe(text)
  text.gsub('<%', '&lt;%').gsub('%>', '%&gt;')
end

.get_template_text(path, helper, base_path = nil, opts = {}) ⇒ Object

Retrieve the template text in the current folder or as an absolute path. This method is used when ‘including’ text



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# File 'lib/zafu/parser.rb', line 42

def get_template_text(path, helper, base_path=nil, opts={})
  cache = (visitor.zafu_cache ||= {})
  unless res = cache[path]
    res = helper.send(:get_template_text, path, base_path, opts)
    res = [parser_error("template '#{path}' not found", 'include'), nil, nil] unless res
    cache[path] = res
  end
  res
end

.new_with_url(path, opts = {}) ⇒ Object 



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# File 'lib/zafu/parser.rb', line 33

def new_with_url(path, opts={})
  helper = opts[:helper] || Zafu::MockHelper.new
  text, fullpath, base_path = self.get_template_text(path, helper)
  return parser_error("template '#{path}' not found", 'include') unless text
  self.new(text, :helper => helper, :base_path => base_path, :included_history => [fullpath], :root => path, :master_template => opts[:master_template])
end

.parser_error(message, method) ⇒ Object 



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# File 'lib/zafu/parser.rb', line 52

def parser_error(message, method)
  "<span class='parser_error'><span class='method'>#{erb_safe method}</span> <span class='message'>#{erb_safe message}</span></span>"
end

Instance Method Details

#all_descendants ⇒ Object Also known as: public_descendants

Return a hash of all descendants. Find a specific descendant with descendant for example.



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# File 'lib/zafu/parser.rb', line 402

def all_descendants
  @all_descendants ||= begin
    d = {}
    @blocks.each do |b|
      next if b.kind_of?(String)
      b.public_descendants.each do |k,v|
        d[k] ||= []
        d[k]  += v
      end
      # latest is used first: use direct children before grandchildren.
      d[b.method] ||= []
      d[b.method] << b
    end
    d
  end
end

#ancestor(keys) ⇒ Object

Return the last defined parent for the given keys.



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# File 'lib/zafu/parser.rb', line 447

def ancestor(keys)
  keys = Array(keys)
  ancestors.reverse_each do |a|
    if keys.include?(a.method)
      return a
    end
  end
  nil
end

#ancestors ⇒ Object 



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# File 'lib/zafu/parser.rb', line 434

def ancestors
  @ancestors ||= begin
    if parent
      parent.ancestors + [parent]
    else
      []
    end
  end
end

#check_params(*args) ⇒ Object 



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# File 'lib/zafu/parser.rb', line 567

def check_params(*args)
  missing = []
  if args[0].kind_of?(Array)
    # or groups
    ok = false
    args.each_index do |i|
      unless args[i].kind_of?(Array)
        missing[i] = [args[i]]
        next
      end
      missing[i] = []
      args[i].each do |arg|
        missing[i] << arg.to_s unless @params[arg]
      end
      if missing[i] == []
        ok = true
        break
      end
    end
    if ok
      return true
    else
      out "[#{@method} parameter(s) missing:#{missing[0].sort.join(', ')}]"
      return false
    end
  else
    args.each do |arg|
      missing << arg.to_s unless @params[arg]
    end
  end
  if missing != []
    out "[#{@method} parameter(s) missing:#{missing.sort.join(', ')}]"
    return false
  end
  true
end

#child ⇒ Object

Find a direct child with child[method].



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# File 'lib/zafu/parser.rb', line 420

def child
  Hash[*@blocks.map do |b|
    b.kind_of?(String) ? nil : [b.method, b]
  end.compact.flatten]
end

#default_expander ⇒ Object

Default processing



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# File 'lib/zafu/parser.rb', line 277

def default_expander
  if respond_to?("r_#{@method}".to_sym)
    do_method("r_#{@method}".to_sym)
  else
    do_method(:process_unknown)
  end
end

#default_unknown ⇒ Object

basic rule to display errors



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# File 'lib/zafu/parser.rb', line 308

def default_unknown
  sp = ""
  @params.each do |k,v|
    sp += " #{k}=#{v.inspect.gsub("'","TMPQUOTE").gsub('"',"'").gsub("TMPQUOTE",'"')}"
  end

  res = "<span class='parser_unknown'>&lt;r:#{@method}#{sp}"
  inner = expand_with
  if inner != ''
    res + "&gt;</span>#{inner}<span class='parser_unknown'>&lt;r:/#{@method}&gt;</span>"
  else
    res + "/&gt;</span>"
  end
end

#descendant(key) ⇒ Object

Return the last defined descendant for the given key.



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# File 'lib/zafu/parser.rb', line 458

def descendant(key)
  descendants(key).last
end

#descendants(key) ⇒ Object 



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# File 'lib/zafu/parser.rb', line 430

def descendants(key)
  all_descendants[key] || []
end

#do_method(sym) ⇒ Object 



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# File 'lib/zafu/parser.rb', line 285

def do_method(sym)
  res = self.send(sym)
  if res.kind_of?(String)
    @result << res
  elsif @result.blank?
    @result << (@errors.empty? ? '' : show_errors)
  end
  @result
end

#dynamic_blocks? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/zafu/parser.rb', line 426

def dynamic_blocks?
  @blocks.detect { |b| !b.kind_of?(String) }
end

#eat(arg) ⇒ Object

Advance parser.



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# File 'lib/zafu/parser.rb', line 505

def eat(arg)
  if arg.kind_of?(String)
    len = arg.length
  elsif arg.kind_of?(Fixnum)
    len = arg
  else
    raise
  end
  @text = @text[len..-1]
end

#empty? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/zafu/parser.rb', line 244

def empty?
  @blocks == [] && (@params == {} || @params == {:part => @params[:part]})
end

#enter(mode) ⇒ Object 



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# File 'lib/zafu/parser.rb', line 516

def enter(mode)
  @stack << mode
  # puts "ENTER(#{@method},:#{mode}) [#{@text}] #{@zafu_tag_count.inspect}"
  if mode == :void
    sym = :scan
  else
    sym = "scan_#{mode}".to_sym
  end
  while (@text != '' && @stack[-1] == mode)
    # puts "CONTINUE(#{@method},:#{mode}) [#{@text}] #{@zafu_tag_count.inspect}"
    self.send(sym)
  end
  # puts "LEAVE(#{@method},:#{mode}) [#{@text}] #{@zafu_tag_count.inspect}"
end

#expand_block(block, new_context = {}) ⇒ Object 



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# File 'lib/zafu/parser.rb', line 604

def expand_block(block, new_context={})
  block.process(@context.merge(new_context))
end

#expand_with(acontext = {}) ⇒ Object 



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# File 'lib/zafu/parser.rb', line 608

def expand_with(acontext={})

  blocks = acontext.delete(:blocks) || @blocks
  res = ""

  only   = acontext[:only]
  new_context = @context.merge(acontext)

  if acontext[:ignore]
    new_context[:ignore] = (@context[:ignore] || []) + (acontext[:ignore] || []).uniq
  end

  if acontext[:no_ignore]
    new_context[:ignore] = (new_context[:ignore] || []) - acontext[:no_ignore]
  end

  ignore = new_context[:ignore]

  blocks.each do |b|
    if b.kind_of?(String)
      if (!only || (only.kind_of?(Array) && only.include?(:string))) && (!ignore || !ignore.include?(:string))
        res << b
      end
    elsif (!only || (only.kind_of?(Array) && only.include?(b.method)) || only =~ b.method) && (!ignore || !ignore.include?(b.method))
      res << b.process(new_context.dup)
      if pass = b.pass
        new_context.merge!(pass)
      end
    end
  end
  res
end

#expander ⇒ Object 



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# File 'lib/zafu/parser.rb', line 85

def expander
  self.class.expander_callbacks.reverse_each do |callback|
    if res = send(callback)
      if res.kind_of?(String)
        @result << res
      end
      return @result
    end
  end
  nil
end

#extract_name ⇒ Object 



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

def extract_name
  @options[:name] || @params[:id]
end

#fail ⇒ Object 



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# File 'lib/zafu/parser.rb', line 562

def fail
  @ok   = false
  @stack = []
end

#flush(str = @text) ⇒ Object 



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# File 'lib/zafu/parser.rb', line 471

def flush(str=@text)
  return if str == ''
  if @blocks.last.kind_of?(String)
    @blocks[-1] << str
  else
    @blocks << str
  end
  @text = @text[str.length..-1]
end

#include_part(obj) ⇒ Object

Hook called when including a part “<r:include template=‘layout’ part=‘title’/>”



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# File 'lib/zafu/parser.rb', line 240

def include_part(obj)
  [obj]
end

#include_template ⇒ Object 



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# File 'lib/zafu/parser.rb', line 336

def include_template
  return parser_error("missing 'template' attribute") unless @params[:template]
  if @options[:part] && @options[:part] == @params[:part]
    # fetching only a part, do not open this element (same as original caller) as it is useless and will make us loop the loop.
    @method = 'ignore'
    enter(:void)
    return
  end
  @method = 'void'

  # fetch text
  @options[:included_history] ||= []

  included_text, absolute_url, base_path = self.class.get_template_text(@params[:template], @options[:helper], @options[:base_path])

  if absolute_url
    absolute_url += "::#{@params[:part].gsub('/','_')}" if @params[:part]
    absolute_url += "??#{@options[:part].gsub('/','_')}" if @options[:part]
    if @options[:included_history].include?(absolute_url)
      included_text = parser_error("infinity loop: #{(@options[:included_history] + [absolute_url]).join(' --&gt; ')}", 'include')
    else
      included_history  = @options[:included_history] + [absolute_url]
    end
  else
    # Error: included_text contains the error meessage
    @blocks = [included_text]
    return
  end

  res = self.class.new(included_text, :helper => @options[:helper], :base_path => base_path, :included_history => included_history, :part => @params[:part], :parent => self) # we set :part to avoid loop failure when doing self inclusion

  if @params[:part]
    if iblock = res.ids[@params[:part]]
      included_blocks = include_part(iblock)
      # get all ids from inside the included part:
      @ids.merge! iblock.defined_ids
    else
      included_blocks = [parser_error("'#{@params[:part]}' not found in template '#{@params[:template]}'", 'include')]
    end
  else
    included_blocks = res.blocks
    @ids.merge! res.ids
  end

  enter(:void) # normal scan on content
  # replace 'with'

  @blocks.each do |b|
    next if b.kind_of?(String) || b.method != 'with'
    if target = res.ids[b.params[:part]]
      if target.kind_of?(String)
        # error
      elsif b.empty?
        target.method = 'ignore'
      else
        target.replace_with(b)
      end
    else
      # part not found
      parser_error("'#{b.params[:part]}' not found in template '#{@params[:template]}'", 'with')
    end
  end
  @blocks = included_blocks
end

#inspect ⇒ Object 



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# File 'lib/zafu/parser.rb', line 641

def inspect
  attributes = []
  params = []
  (@params || {}).each do |k,v|
    unless v.nil?
      params << "#{k.inspect.gsub('"', "'")}=>'#{v}'"
    end
  end
  attributes << " {= #{params.sort.join(', ')}}" unless params == []

  context = []
  (@context || {}).each do |k,v|
    unless v.nil?
      context << "#{k.inspect.gsub('"', "'")}=>'#{v}'"
    end
  end
  attributes << " {> #{context.sort.join(', ')}}" unless context == []

  res = []
  @blocks.each do |b|
    if b.kind_of?(String)
      res << b
    else
      res << b.inspect
    end
  end
  result = "[#{@method}#{attributes.join('')}"
  if res != []
    result += "]#{res}[/#{@method}]"
  else
    result += "/]"
  end
  result + @text
end

#leave(mode = nil) ⇒ Object 



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# File 'lib/zafu/parser.rb', line 550

def leave(mode=nil)
  if mode.nil?
    @stack = []
    return
  end
  pop  = true
  while @stack != [] && pop
    pop = @stack.pop
    break if pop == mode
  end
end

#make(mode, opts = {}) ⇒ Object 



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# File 'lib/zafu/parser.rb', line 531

def make(mode, opts={})
  if opts[:text]
    custom_text = opts.delete(:text)
  end
  text = custom_text || @text
  opts = @options.merge(opts).merge(:sub => true, :mode => mode, :parent => self)
  new_obj = self.class.new(text, opts)
  if new_obj.success?
    @text = new_obj.text unless custom_text
    new_obj.text = ""
    store new_obj
  else
    flush @text[0..(new_obj.text.length - @text.length)] unless custom_text
  end
  # puts "MADE #{new_obj.inspect}"
  # puts "TEXT #{@text.inspect}"
  new_obj
end

#out(str) ⇒ Object

Output ERB code during ast processing.



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# File 'lib/zafu/parser.rb', line 491

def out(str)
  @result << str
  # Avoid double entry when this is the last call in a render method.
  true
end

#out_post(str) ⇒ Object

Output ERB code that will be inserted after @result.



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# File 'lib/zafu/parser.rb', line 498

def out_post(str)
  @out_post << str
  # Avoid double entry when this is the last call in a render method.
  true
end

#parser_continue(message, method = @method) ⇒ Object 



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# File 'lib/zafu/parser.rb', line 148

def parser_continue(message, method = @method)
  parser_error(message, method, false)
end

#parser_error(message, method = @method, halt = true) ⇒ Object 



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# File 'lib/zafu/parser.rb', line 139

def parser_error(message, method = @method, halt = true)
  if halt
    self.class.parser_error(message, method)
  else
    @errors << self.class.parser_error(message, method)
    nil
  end
end

#process(context = {}) ⇒ Object 



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# File 'lib/zafu/parser.rb', line 248

def process(context={})
  return '' if @method == 'ignore' || @method.blank?

  saved = save_state

  if @name
    # we pass the name as 'context' in the children tags
    @context = context.merge(:name => @name)
  else
    @context = context
  end
  # FIXME: replace with array and join (faster)
  @result   = ""
  @out_post = ""
  @pass     = nil

  before_process

  res = wrap(expander || default_expander)

  res = after_process(res)

  # restore state
  restore_state(saved)

  res
end

#process_unknown ⇒ Object 



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# File 'lib/zafu/parser.rb', line 152

def process_unknown
  self.class.process_unknown_callbacks.each do |callback|
    if res = send(callback)
      return res
    end
  end
  @errors.empty? ? default_unknown : show_errors
end

#r_expand_with ⇒ Object

Set context with variables (unsafe) from template.



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# File 'lib/zafu/parser.rb', line 324

def r_expand_with
  hash = {}
  @params.each do |k,v|
    hash["exp_#{k}"] = v.inspect
  end
  expand_with(hash)
end

#r_ignore ⇒ Object 



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# File 'lib/zafu/parser.rb', line 332

def r_ignore
  ''
end

#r_inspect ⇒ Object 



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# File 'lib/zafu/parser.rb', line 301

def r_inspect
  expand_with(:preflight=>true)
  @blocks = []
  self.inspect
end

#r_void ⇒ Object Also known as: to_s 



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

def r_void
  expand_with
end

#replace_with(obj) ⇒ Object

Hook called when replacing part of an included template with ‘<r:with part=’main’>…</r:with>‘ This replaces the current object ’self’ which is in the original included template, with the custom version ‘obj’.



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# File 'lib/zafu/parser.rb', line 232

def replace_with(obj)
  # keep @method (obj's method is always 'with')
  @blocks = obj.blocks.empty? ? @blocks : obj.blocks
  obj.params.delete(:part)
  @params.merge!(obj.params)
end

#restore_state(saved) ⇒ Object

Restore state from a hash



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# File 'lib/zafu/parser.rb', line 133

def restore_state(saved)
  saved.each do |key, value|
    instance_variable_set(key, value)
  end
end

#root ⇒ Object

Return the root block (the one opened first).



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# File 'lib/zafu/parser.rb', line 463

def root
  @root ||= parent ? parent.root : self
end

#save_state ⇒ Object

This method is called at the very beginning of the processing chain and is used to store state to make ‘process’ reintrant…



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# File 'lib/zafu/parser.rb', line 121

def save_state
  {
   :@context  => @context, # <== we need this when rendering twice the same part
   :@result   => @result,
   :@out_post => @out_post,
   :@params   => @params.dup,
   :@method   => @method,
   :@var      => @var,
  }
end

#show_errors ⇒ Object 



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# File 'lib/zafu/parser.rb', line 161

def show_errors
  @errors.join(' ')
end

#start(mode) ⇒ Object 



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# File 'lib/zafu/parser.rb', line 219

def start(mode)
  enter(mode)
end

#store(obj) ⇒ Object

Build blocks



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# File 'lib/zafu/parser.rb', line 482

def store(obj)
  if obj.kind_of?(String) && @blocks.last.kind_of?(String)
    @blocks[-1] << obj
  elsif obj != ''
    @blocks << obj
  end
end

#success? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/zafu/parser.rb', line 467

def success?
  return @ok
end

#to_erb(context) ⇒ Object 



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# File 'lib/zafu/parser.rb', line 214

def to_erb(context)
  context[:helper] ||= @options[:helper]
  process(context)
end

#wrap(text) ⇒ Object 



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# File 'lib/zafu/parser.rb', line 110

def wrap(text)
  after_wrap(
    wrap_callbacks(
      before_wrap(text) + @out_post
    )
    # @text contains unparsed data (white space)
  ) + @text
end

#wrap_callbacks ⇒ Object 



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# File 'lib/zafu/parser.rb', line 108

alias wrap_callbacks wrap