Let’s read text documents and build up the table of contents from the headings hierarchy / tree.
Aside: What’s text with markdown formatting conventions?
Markdown uses hashtags (#) for marking up headings. Example:
# Heading Level 1
## Heading Level 2
### Heading Level 3
#### Heading Level 4
...
The challenge: Code a toc (table of contents) method that passes the RubyQuizTest :-).
def toc( txt )
# ...
end
For the starter level 1 build the table of contents (toc) for the ruby meetups in europe document / page in text with markdown formatting conventions. Turn:
## Europe
### Central Europe
#### Austria / Österreich (at)
#### Switzerland / Schweiz / Suisse / Confoederatio Helvetica (ch)
#### Germany / Deutschland (de)
#### Slovakia (sk)
#### Slovenia (si)
#### Czech Republic (cz)
#### Poland (pl)
#### Hungary (hu)
### Western Europe
#### England (en)
#### Scotland
#### Northern Ireland
#### Ireland / Éire (ie)
#### France (fr)
#### Belgium / België / Belgique (be)
#### Netherlands (nl)
### Southern Europe
#### Spain / España (es)
#### Portugal (pt)
#### Italy (it)
#### Croatia / Hrvatska (hr)
### Northern Europe
#### Denmark / Danmark (dk)
#### Sweden / Sverige (se)
#### Finland / Suomi (fi)
#### Norway / Norge (no)
#### Lithuania / Lietuva (lt)
### Eastern Europe
#### Belarus / Беларусь (by)
#### Bulgaria (bg)
#### Romania / România (ro)
#### Russia / Россия (ru)
#### Ukraine / Україна (ua)
(Note: All text stripped for clarity, that is, making it clear to see the heading hierarchy / tree structure of the page.)
into:
[[2, "Europe",
[[3, "Central Europe",
[[4, "Austria / \xC3\x96sterreich (at)"],
[4, "Switzerland / Schweiz / Suisse / Confoederatio Helvetica (ch)"],
[4, "Germany / Deutschland (de)"],
[4, "Slovakia (sk)"],
[4, "Slovenia (si)"],
[4, "Czech Republic (cz)"],
[4, "Poland (pl)"],
[4, "Hungary (hu)"]]],
[3, "Western Europe",
[[4, "England (en)"],
[4, "Scotland"],
[4, "Northern Ireland"],
[4, "Ireland / \xC3\x89ire (ie)"],
[4, "France (fr)"],
[4, "Belgium / Belgi\xC3\xAB / Belgique (be)"],
[4, "Netherlands (nl)"]]],
[3, "Southern Europe",
[[4, "Spain / Espa\xC3\xB1a (es)"],
[4, "Portugal (pt)"],
[4, "Italy (it)"],
[4, "Croatia / Hrvatska (hr)"]]],
[3, "Northern Europe",
[[4, "Denmark / Danmark (dk)"],
[4, "Sweden / Sverige (se)"],
[4, "Finland / Suomi (fi)"],
[4, "Norway / Norge (no)"],
[4, "Lithuania / Lietuva (lt)"]]],
[3, "Eastern Europe",
[[4, "Belarus / \xD0\x91\xD0\xB5\xD0\xBB\xD0\xB0\xD1\x80\xD1\x83\xD1\x81\xD1\x8C (by)"],
[4, "Bulgaria (bg)"],
[4, "Romania / Rom\xC3\xA2nia (ro)"],
[4, "Russia / \xD0\xA0\xD0\xBE\xD1\x81\xD1\x81\xD0\xB8\xD1\x8F (ru)"],
[4, "Ukraine / \xD0\xA3\xD0\xBA\xD1\x80\xD0\xB0\xD1\x97\xD0\xBD\xD0\xB0 (ua)"]]]]]]
Note: For easy reference and testing you can use the “local” page, see pages/meetups.md.
To qualify for solving the code challenge / puzzle you must pass the test:
require 'minitest/autorun'
class RubyQuizTest < MiniTest::Test
def test_toc
headings = [[2, "Europe",
[[3, "Central Europe",
[[4, "Austria / \xC3\x96sterreich (at)"],
[4, "Switzerland / Schweiz / Suisse / Confoederatio Helvetica (ch)"],
[4, "Germany / Deutschland (de)"],
[4, "Slovakia (sk)"],
[4, "Slovenia (si)"],
[4, "Czech Republic (cz)"],
[4, "Poland (pl)"],
[4, "Hungary (hu)"]]],
[3, "Western Europe",
[[4, "England (en)"],
[4, "Scotland"],
[4, "Northern Ireland"],
[4, "Ireland / \xC3\x89ire (ie)"],
[4, "France (fr)"],
[4, "Belgium / Belgi\xC3\xAB / Belgique (be)"],
[4, "Netherlands (nl)"]]],
[3, "Southern Europe",
[[4, "Spain / Espa\xC3\xB1a (es)"],
[4, "Portugal (pt)"],
[4, "Italy (it)"],
[4, "Croatia / Hrvatska (hr)"]]],
[3, "Northern Europe",
[[4, "Denmark / Danmark (dk)"],
[4, "Sweden / Sverige (se)"],
[4, "Finland / Suomi (fi)"],
[4, "Norway / Norge (no)"],
[4, "Lithuania / Lietuva (lt)"]]],
[3, "Eastern Europe",
[[4, "Belarus / \xD0\x91\xD0\xB5\xD0\xBB\xD0\xB0\xD1\x80\xD1\x83\xD1\x81\xD1\x8C (by)"],
[4, "Bulgaria (bg)"],
[4, "Romania / Rom\xC3\xA2nia (ro)"],
[4, "Russia / \xD0\xA0\xD0\xBE\xD1\x81\xD1\x81\xD0\xB8\xD1\x8F (ru)"],
[4, "Ukraine / \xD0\xA3\xD0\xBA\xD1\x80\xD0\xB0\xD1\x97\xD0\xBD\xD0\xB0 (ua)"]]]]]]
assert_equal headings, toc( File.open( "./pages/meetups.md", "r:utf-8" ).read )
end # method test_toc
end # class RubyQuizTest
Post your code snippets on the “official” Ruby Quiz Channel, that is, the ruby-talk mailing list.
Happy text processing with Ruby.