Rebol / Red Parse html rules returns true but nothing is inserted

Question

I have a parse rules that returns true but it doesn't insert my text as expected : the html is unchanged whereas it should have inserted at the end of the main closing div. I tried to use a counter like How to parse inside HTML tags with REBOL?

Update: I also don't know how to break out of the parsing as soon as counter = 0 so as not to insert text before last closing div after main.

    content: {<div class="main">
      <h1>
        Big TITLE
      </h1>
      <div>
        <section>
          <p>a paragraph</p>
        </section>
         <section>
          <p>a paragraph</p>
        </section>
          <section>
          <p>a paragraph</p>
        </section>
       </div>
       <div>
          <p>Blah Blah</p>
       </div>

    </div>
    <div>
      Another Div
    </div>
    }

    rules: [
      thru <div class="main">
      (div-count: 1)
      some [
        to "<div" (++ div-count) thru "<div" thru ">"
        |
        to </div> mark: (-- div-count if div-count = 0 [insert mark "closing main div"]) thru </div>
      ]
      to end 
    ]
    parse content rules

Answer 1

Here a solution with probe to debug

rules: [
     thru <div class="main">
     (div-count: 1)
      some [
        "<div" (probe ++ div-count) skip
      |
        "</div>" mark:  ( probe -- div-count   if div-count = 0 [insert mark "closing main div"]) skip 
      |  skip
     ]
  ]
parse/all content rules 

The problems with your rules are, that the div-count is never or seldom subtracted. The parse pointer goes straight to the next opening div as to is always the first fulfilled condition.

You can break out or better return from parse if you add a to end after a successful condition. If you are unsure use brackets for grouping [ sucessful sub-rules ... to end ]

An example with an end-rule

end-rule: [] ; or none
rules: [
    thru <div class="main">
    (div-count: 1)
    some [
        ["<div" (++ div-count) skip]
    |
        ["</div>"mark:  (-- div-count   if div-count = 0 [insert mark "closing main div"  end-rule: [to end]]) end-rule ]
    |  skip
]

]