Class: Cheri::Builder::TypeConnecter

Inherits:
Object
  • Object
show all
Defined in:
lib/cheri/builder/connecter.rb

Defined Under Namespace

Classes: SCtr, Sym, TCtr, Type

Instance Method Summary collapse

Constructor Details

#initialize(*parents, &block) ⇒ TypeConnecter

Returns a new instance of TypeConnecter.



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# File 'lib/cheri/builder/connecter.rb', line 30

def initialize(*parents,&block)
  @t = {}
  @s = {}
  @c = {}
  parents.each do |parent| merge!(parent); end
  instance_eval(&block) if block
end

Instance Method Details

#add_type(mod) ⇒ Object

used by simple builder-builder



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# File 'lib/cheri/builder/connecter.rb', line 155

def add_type(mod) #:nodoc:
  @t[mod] ||= Type.new(mod)
end

#merge!(other) ⇒ Object 



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# File 'lib/cheri/builder/connecter.rb', line 38

def merge!(other)
  raise Cheri.type_error(other,TypeConnecter) unless TypeConnecter === other
  t = @t
  s = @s
  other.get_types.each_pair do |mod,type|
    if (tmod = t[mod])
      tmod.merge(type)
    else
      t[mod] = type.copy
    end
  end
  other.get_syms.each_pair do |sym,symc|
    if (ssym = s[sym])
      ssym.merge(symc)
    else
      s[sym] = symc.copy
    end
  end
  self
end

#prepare(ctx, builder, obj, sym, props) ⇒ Object 



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# File 'lib/cheri/builder/connecter.rb', line 59

def prepare(ctx,builder,obj,sym,props)
  # try parent symbol matches first
  if (ssym = @s[builder.sym])
    # child symbol match?
    if (sctr = ssym.sctrs[sym])
      return sctr.prepare(ctx,builder,obj,sym,props) 
    end
    # child type match?
    unless ssym.tctrs.empty?
      anc = (class<<obj;self;end).ancestors
      ix = anc.length
      match = nil
      # match on nearest ancestor
      ssym.tctrs.each do |tctr|
        if (cix = anc.index(tctr.mod)) && cix < ix
          ix = cix
          match = tctr
        end
      end
      return match.prepare(ctx,builder,obj,sym,props) if match
    end
  end
  # then try parent type matches
  t = @t
  bld_anc = (class<<builder.object;self;end).ancestors
  anc ||= (class<<obj;self;end).ancestors
  key = [sym,bld_anc,anc]
  if (ctr = @c[key])
    return ctr.prepare(ctx,builder,obj,sym,props)
  end
  bld_anc.each do |a|
    if (type = t[a])
      # child symbol match?
      if (sctr = type.sctrs[sym])
        @c[key] = sctr
        return sctr.prepare(ctx,builder,obj,sym,props) 
      end
      # child type match?
      #anc ||= (class<<obj;self;end).ancestors
      ix ||= anc.length
      match = nil
      # match on nearest ancestor
      type.tctrs.each do |tctr|
        if (cix = anc.index(tctr.mod)) && cix < ix
          ix = cix
          match = tctr
        end
      end
      if match
        @c[key] = match
        return match.prepare(ctx,builder,obj,sym,props)
      end
    end
  end
  false
end

#type(mod, &k) ⇒ Object Also known as: types, symbol, symbols 



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# File 'lib/cheri/builder/connecter.rb', line 116

def type(mod,&k)
  if Module === mod
    tp = @t[mod] ||= Type.new(mod)
    tp.instance_eval(&k) if k
  elsif Symbol === mod
    sm = @s[mod] ||= Sym.new(mod)
    sm.instance_eval(&k) if k
  elsif Array === mod
    mod.each do |m|
      if Symbol === m
        sm = @s[m] ||= Sym.new(m)
        sm.instance_eval(&k) if k
      elsif Module === m
        tp = @t[m] ||= Type.new(m)
        tp.instance_eval(&k) if k
      else
        raise Cheri.type_error(m,Symbol,Class,Module)
      end
    end    
  else
    raise Cheri.type_error(mod,Class,Module,Symbol,Array)
  end
  nil
end