Eliminate use of ExtPatterns class from Ast.

require "jsduck/serializer"

require "jsduck/evaluator"

require "jsduck/function_ast"

require "jsduck/ext_patterns"

require "jsduck/ast_node"

module JsDuck

    private

    def function?(ast)

      ast["type"] == "FunctionDeclaration" || ast["type"] == "FunctionExpression" || empty_fn?(ast)

      AstNode.new(ast).function?

    end

    def empty_fn?(ast)

      ast["type"] == "MemberExpression" && ext_pattern?("Ext.emptyFn", ast)

    end

    def ext_pattern?(pattern, ast)

      ExtPatterns.matches?(pattern, to_s(ast))

      AstNode.new(ast).ext_empty_fn?

    end

    def object?(ast)