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In a fictional document management system, input documents are structured with weighted headings. Lowest weighted headings are the most important.

This is a sample document:

H1 All About Birds

H2 Kinds of Birds

H3 The Finch

H3 The Swan

H2 Habitats

H3 Wetlands

From this document we would like to produce an outline using nested ordered lists in HTML, which would look like this when rendered:

  1. All About Birds
    1. Kinds of Birds
      1. The Finch
      2. The Swan
    2. Habitats
      1. Wetlands

Your code only needs to take the input list and transform it into the expected data structure, which will be printed.

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    \$\begingroup\$ When you say "using nested ordered lists in HTML" do you mean we need to produce HTML? If so could you define its form for us? (Or may we just indent using a space (or a tab?)?) \$\endgroup\$ Commented May 11, 2019 at 20:37
  • \$\begingroup\$ Can the titles be assumed to only contain letters and spaces? \$\endgroup\$ Commented May 11, 2019 at 21:06
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    \$\begingroup\$ Hi and welcome to codegolf! To avoid having to answer questions like those you received, please note that we have a sandbox for proposed challenges which allows you to receive feedback before posting. As is you are missing a few important details, like those already asked about, and things like what the highest header level there will be (or if it is indefinite). \$\endgroup\$ Commented May 11, 2019 at 21:26
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    \$\begingroup\$ May the level be greater than \$9\$? \$\endgroup\$ Commented May 11, 2019 at 23:06
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    \$\begingroup\$ Are we guaranteed to always have level \$L+1\$ between levels \$L\$ and \$L+2\$? Are we supposed to return valid HTML? (with all trailing </ol> tags) \$\endgroup\$ Commented May 11, 2019 at 23:35

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Jelly, 53 50 bytes

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Try it online!

A monadic link taking a list of strings as input and outputting an HTML fragment with nested ordered lists. Should handle arbitrarily deep nesting of lists and return a syntactically valid HTML fragment.

Example:

H1 All About Birds H2 Kinds of Birds H3 The Finch H3 The Swan H2 Habitats H3 Wetlands H4 Types of wetlands H5 Very wet wetland H3 Coast H1 All about fish H2 Sharks

yields:

<ol><li>All About Birds</li><ol><li>Kinds of Birds</li><ol><li>The Finch</li><li>The Swan</li></ol><li>Habitats</li><ol><li>Wetlands</li><ol><li>Types of wetlands</li><ol><li>Very wet wetland</li></ol></ol><li>Coast</li></ol></ol><li>All about fish</li><ol><li>Sharks</li></ol></ol>
  1. All About Birds
    1. Kinds of Birds
      1. The Finch
      2. The Swan
    2. Habitats
      1. Wetlands
        1. Types of wetlands
          1. Very wet wetland
      2. Coast
  2. All about fish
    1. Sharks
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