Class: Fabulator::Grammar::Actions::Grammar

Inherits:
Structural
  • Object
show all
Defined in:
lib/fabulator/grammar/actions/grammar.rb

Instance Method Summary collapse

Instance Method Details

#add_rule(r, m = :default) ⇒ Object 



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# File 'lib/fabulator/grammar/actions/grammar.rb', line 42

def add_rule(r, m = :default)
  return if r.nil?
  mode = ((r.mode.nil? || r.mode.to_sym == :default) ? m : r.mode).to_sym
  @modes[mode] ||= { }
  @modes[mode][r.name.to_sym] = r
end

#compile_xml(xml, context = nil) ⇒ Object 



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# File 'lib/fabulator/grammar/actions/grammar.rb', line 18

def compile_xml(xml, context = nil)
  super

  @modes = { :default => { } }

  @contexts.each do |c|
    c.tokens.each do |token|
      self.add_rule(token, c.mode)
    end
    c.rules.each do |rule|
      self.add_rule(rule, c.mode)
    end
  end
  @tokens.each do |token|
    self.add_rule(token)
  end
  @rules.each do |rule|
    self.add_rule(rule)
  end

  @tokens = nil
  @rules = nil
end

#get_rule(m, nom) ⇒ Object 



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# File 'lib/fabulator/grammar/actions/grammar.rb', line 49

def get_rule(m, nom)
  @modes[m.to_sym].nil? ? nil : @modes[m.to_sym][nom.to_sym]
end

#match(ctx, nom, s) ⇒ Object 



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# File 'lib/fabulator/grammar/actions/grammar.rb', line 61

def match(ctx, nom, s)
  cursor = Fabulator::Grammar::Cursor.new(self, ctx, s)
  !do_parse(nom, cursor).nil?
end

#parse(ctx, nom, s) ⇒ Object 



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# File 'lib/fabulator/grammar/actions/grammar.rb', line 53

def parse(ctx, nom, s)
  cursor = Fabulator::Grammar::Cursor.new(self, ctx, s)
  cursor.anchored = true
  ret = do_parse(nom, cursor)
  cursor.do_skip
  cursor.eof? ? ret : nil
end

#run_constraint(ctx, nom) ⇒ Object 



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# File 'lib/fabulator/grammar/actions/grammar.rb', line 109

def run_constraint(ctx, nom)
  # runs as a match and requires full anchored matching
  !self.parse(ctx, nom, ctx.root.to_s).nil?
end

#run_filter(ctx, nom) ⇒ Object 



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# File 'lib/fabulator/grammar/actions/grammar.rb', line 100

def run_filter(ctx, nom)
  # runs as a parser and replaces the string with the resulting
  # content that matched
  source = ctx.root.to_s
  cursor = Fabulator::Grammar::Cursor.new(self, ctx, source)
  ret = do_parse(nom, cursor)
  ctx.root.value = ret.nil? ? '' : source[cursor.start .. cursor.pos-1]
end

#run_function(context, nom, args) ⇒ Object 



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# File 'lib/fabulator/grammar/actions/grammar.rb', line 66

def run_function(context, nom, args)
  # treat these as mappings
  strings = args.collect{ |a| a.to_s }
  matching = false
  if nom =~ /\?$/
    matching = true
  end
  nom.gsub!(/\?$/, '')
  ret = matching ? strings.collect{ |s| self.match(context, nom, s) } :
                   strings.collect{ |s| self.parse(context, nom, s) }
  ret -= [ nil ]
  if matching
    ret = ret.collect{ |r| context.root.anon_node(!!r, [FAB_NS, 'boolean']) }
  else
    while ret.select{ |r| r.name.nil? && r.value.nil? }.size > 0
      ret = ret.collect{ |r|
        if r.name.nil? && r.value.nil?
          r.children
        else
          r
        end
      }.flatten - [ nil ]
    end
    if !ret.empty?
      new_ret = ret.first.roots['data'].anon_node(nil)
      ret.each do |r|
        new_ret.add_child(r)
      end
    end
    ret = [ new_ret ]
  end
  ret
end