The polyrex-schema gem builds a Polyrex document from a string representation of the schema.

gem install polyrex-schema

require 'polyrex-schema'

o = PolyrexSchema.new 'config/entry[name]/extension[string]/instruction[line,command]'
o.to_s

output:

<root>
  <config>
    <summary/>
    <records>
      <entry>
        <summary><name/></summary>
        <records>
          <extension>
            <summary><string/></summary>
            <records>
              <instruction>
                <summary><line/><command/></summary>
                <records/>
              </instruction>
            </records>
          </extension>
        </records>
      </entry>
    </records>
  </config>
</root>

Polyrex-schema version 3.0 can now handle a schema that contain siblings recursively e.g.

require 'polyrex-schema'



o = PolyrexSchema.new 'a/{c[name,count];c2[age]/{f[title];f2[colour]}}/d[title]'

puts o.to_doc.xml pretty: true

output:

  

    polyrex
    a/{c[name,count];c2[age]/{f[title];f2[colour]}}/d[title]
  
  
    
      

        
        
        c[name,count]/d[title]
        [!name] [!count]
      
      
        
          

            <title></title>
            d[title]
            [!title]
          
          
        
      
    
    
      

        
        c2[age]/{f[title];f2[colour]}/d[title]
        [!age]
      
      
        
          

            <title></title>
            f[title]/d[title]
            [!title]
          
          
            
              

                <title></title>
                d[title]
                [!title]
              
              
            
          
        
        
          

            
            f2[colour]/d[title]
            [!colour]
          
          
            
              

                <title></title>
                d[title]
                [!title]
              
              
            
          
        
      
    
  

• jrobertson's polyrex-schema at master [github.com]