Ron Savage > WWW-Scraper-Wikipedia-ISO3166 > WWW::Scraper::Wikipedia::ISO3166

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NAME ^

WWW::Scraper::Wikipedia::ISO3166 - Gently scrape Wikipedia for ISO3166-2 data

Synopsis ^

Wikipedia has been scraped. You do not need to run the scripts which download pages from there.

Just use the SQLite database shipped with this module, share/www.scraper.wikipedia.iso3166.sqlite.

See scripts/export.*.pl and scripts/get.*.pl for sample code.

Methods which return hashrefs

        use WWW::Scraper::Wikipedia::ISO3166::Database;

        my($database)     = WWW::Scraper::Wikipedia::ISO3166::Database -> new;
        my($countries)    = $database -> read_countries_table;
        my($subcountries) = $database -> read_subcountries_table;
        my($categories)   = $database -> read_subcountry_categories_table;
        my($types)        = $database -> read_subcountry_info_table;
        ...

Each key in returned hashrefs points to a hashref of all columns for the given key.

So, $$countries{13} points to this hashref:

        {
                id                => 13,
                code2             => 'AU',
                code3             => '',
                fc_name           => 'australia',
                hash_subcountries => 'Yes',
                name              => 'Australia',
                number            => '036',
                timestamp         => '2012-05-08 04:04:43',
        }

One element of %$subcountries is $$subcountries{941}:

        {
                id                     => 941,
                country_id             => 13,
                code                   => 'AU-VIC',
                fc_name                => 'victoria',
                name                   => 'Victoria',
                sequence               => 7,
                subcountry_category_id => 8,
                timestamp              => '2012-05-08 04:05:27',
        }

Warnings

These hashrefs use the table's primary key as the hashref's key. In the case of the countries table, the primary key is the country's id, and is used as subcountries.country_id. But, in the case of the subcountries table, the id does not have any meaning apart from being a db primary key. See "What is the database schema?" for details.

Scripts which output to a file

Note: Many of these programs respond to the -h command line switch, but not create.tables.pl nor drop.tables.pl.

Some examples:

        shell> perl scripts/export.as.csv.pl -c countries.csv -s subcountries.csv
        shell> perl scripts/export.as.html.pl -w iso.3166-2.html
        shell> perl -Ilib scripts/populate.countries.pl -maxlevel debug
        shell> perl -Ilib scripts/populate.subcountries.pl -maxlevel debug

The HTML file is on-line at: http://savage.net.au/Perl-modules/html/WWW/Scraper/Wikipedia/ISO3166/iso.3166-2.html.

        shell>perl scripts/report.statistics.pl

        Output statistics:
        countries_in_db => 249
        has_subcounties => 200
        subcountries_in_db => 5297
        subcountry_files_downloaded => 249
        subcountry_info_in_db => 352

See also scripts/report.*.pl and t/report.t.

Description ^

WWW::Scraper::Wikipedia::ISO3166 is a pure Perl module.

It is used to download various ISO3166-related pages from Wikipedia, and to then import data (scraped from those pages) into an SQLite database.

The pages have already been downloaded, so that phase only needs to be run when pages are updated.

Likewise, the data has been imported.

This means you would normally only ever use the database in read-only mode.

Note: Many of these programs respond to the -h command line switch, but not create.tables.pl nor drop.tables.pl.

Scripts, all shipped in scripts/:

o build.database.sh

Mainly for use by me. It runs:

o perl -Ilib scripts/drop.tables.pl
o perl -Ilib scripts/create.tables.pl
o perl -Ilib scripts/populate.countries.pl -maxlevel debug
o perl -Ilib scripts/populate.subcountries.pl -maxlevel debug
o perl -Ilib scripts/export.as.html.pl -w data/iso.3166-2.html
o cp data/iso.3166-2.html $DR/

$DR is my web site's RAMdisk-based doc root.

perl -Ilib scripts/export.as.csv.pl \
o check.downloads.pl

Ensure each subcountry file has been downloaded, and report any which haven't been. Also report and unexpected subcountry files found in data/.

o perl -Ilib scripts/create.tables.pl
o perl -Ilib scripts/drop.tables.pl
o export.as.csv.pl -country_file c.csv -subcountry_file s.csv subcountry_info_file i.csv

Exports the country, subcountry and subcountry info data as CSV.

Input: share/www.scraper.wikipedia.iso3166.sqlite.

Output: data/countries.csv and data/subcountries.csv.

o export.as.html -w c.html

Exports the country and subcountry data as HTML.

Input: share/www.scraper.wikipedia.iso3166.sqlite.

Output: data/iso.3166-2.html.

On-line: http://savage.net.au/Perl-modules/html/WWW/Scraper/Wikipedia/ISO3166/iso.3166-2.html.

o find.db.pl

After installation, this will print the path to www.scraper.wikipedia.iso3166.sqlite.

o get.country.pages.pl

1: Downloads the ISO3166-1 and ISO3166-2 pages from Wikipedia.

Input: https://en.wikipedia.org/wiki/ISO_3166-1 and <https://en.wikipedia.org/wiki/ISO_3166-2>.

Output: data/en.wikipedia.org.wiki.ISO_3166-1.html and data/en.wikipedia.org.wiki.ISO_3166-2.html.

o get.subcountry.page.pl and scripts/get.subcountry.pages.pl

Downloads each countries' corresponding subcountries page.

Source: http://en.wikipedia.org/wiki/ISO_3166:$code2.html.

Output: data/en.wikipedia.org.wiki.ISO_3166-2.$code2.html.

o pod2html.sh

For use by the author. It converts each *.pm file into the corresponding *.html file, and outputs them to my web server's doc root.

o populate.countries.pl

Imports country data into an SQLite database.

Input: data/en.wikipedia.org.wiki.ISO_3166-1.html, data/en.wikipedia.org.wiki.ISO_3166-2.html.

Output: share/www.scraper.wikipedia.iso3166.sqlite.

o populate.subcountry.pl and scripts/populate.subcountries.pl

Imports subcountry data into the database.

Source: data/en.wikipedia.org.wiki.ISO_3166-2.$code2.html.

Output: share/www.scraper.wikipedia.iso3166.sqlite.

Note: When the distro is installed, this SQLite file is installed too. See "Where is the database?" for details.

o report.Australian.statistics.pl

A simple test program. See also the next script.

Run it with the '-max info' command line options.

o report.statistics.pl

A simple test program. See also the previous script.

Run it with the '-max info' command line options.

Constructor and initialization ^

new(...) returns an object of type WWW::Scraper::Wikipedia::ISO3166.

This is the class's contructor.

Usage: WWW::Scraper::Wikipedia::ISO3166 -> new().

This method takes a hash of options.

Call new() as new(option_1 => value_1, option_2 => value_2, ...).

Available options (these are also methods):

o config_file => $file_name

The name of the file containing config info, such as css_url and template_path. These are used by "as_html()" in WWW::Scraper::Wikipedia::ISO3166::Database::Export.

The code prefixes this name with the directory returned by "dist_dir()" in File::ShareDir.

Default: .htwww.scraper.wikipedia.iso3166.conf.

o logger => $aLoggerObject

Specify a logger compatible with Log::Handler, for the lexer and parser to use.

Default: A logger of type Log::Handler which writes to the screen.

To disable logging, just set 'logger' to the empty string (not undef).

o maxlevel => $logOption1

This option affects Log::Handler.

Possible values for maxlevel and minlevel are:

o debug

Generates the maximum amount of output.

o info
o notice

By default, notice is the highest level used.

o warning, warn
o error, err

By default, error is the lowest level used.

o critical, crit
o alert
o emergency, emerg

See the Log::Handler::Levels docs.

Default: 'notice'.

o minlevel => $logOption2

This option affects Log::Handler.

See the Log::Handler::Levels docs.

Default: 'error'.

No lower levels are used.

o sqlite_file => $file_name

The name of the SQLite database of country and subcountry data.

The code prefixes this name with the directory returned by "dist_dir()" in File::ShareDir.

Default: www.scraper.wikipedia.iso3166.sqlite.

Distributions ^

This module is available as a Unix-style distro (*.tgz).

Install WWW::Scraper::Wikipedia::ISO3166 as you would for any Perl module:

Run:

        cpanm WWW::Scraper::Wikipedia::ISO3166

or run:

        sudo cpan WWW::Scraper::Wikipedia::ISO3166

or unpack the distro, and then run:

        perl Makefile.PL
        make (or dmake)
        make test
        make install

See http://savage.net.au/Perl-modules.html for details.

See http://savage.net.au/Perl-modules/html/installing-a-module.html for help on unpacking and installing.

Methods ^

config_file($file_name)

Get or set the name of the config file.

The code prefixes this name with the directory returned by "dist_dir()" in File::ShareDir.

config_file is an option to "new()".

log($level, $s)

If a logger is defined, this logs the message $s at level $level.

logger([$logger_object])

Here, the [] indicate an optional parameter.

Get or set the logger object.

To disable logging, just set 'logger' to the empty string (not undef), in the call to "new()".

This logger is passed to other modules.

logger is a parameter to "new()". See "Constructor and Initialization" for details.

maxlevel([$string])

Here, the [] indicate an optional parameter.

Get or set the value used by the logger object.

This option is only used if an object of type Log::Handler is ceated. See Log::Handler::Levels.

maxlevel is a parameter to "new()". See "Constructor and Initialization" for details.

minlevel([$string])

Here, the [] indicate an optional parameter.

Get or set the value used by the logger object.

This option is only used if an object of type Log::Handler is created. See Log::Handler::Levels.

minlevel is a parameter to "new()". See "Constructor and Initialization" for details.

new()

See "Constructor and initialization".

sqlite_file($file_name)

Get or set the name of the database file.

The code prefixes this name with the directory returned by "dist_dir()" in File::ShareDir.

sqlite_file is an option to "new()".

FAQ ^

Design faults in ISO3166

Where ISO3166 uses Country Name, I would have used Long Name and Short Name.

Then we'd have:

        Long Name:  Bolivia (Plurinational State of)
        Short Name: Bolivia

This distro uses the values directly from Wikipedia, which is what I have called Long Name above, for all country and subcountry names.

Are any names modified by the code?

Yes. &#39; is converted into a single quote.

Where is the database?

It is shipped in share/www.scraper.wikipedia.iso3166.sqlite.

It is installed into the distro's shared dir, as returned by "dist_dir()" in File::ShareDir. Run scripts/find.db.pl to see what dir it is on your machine.

On my machine it's:

/home/ron/perl5/perlbrew/perls/perl-5.20.2/lib/site_perl/5.20.2/auto/share/dist/WWW-Scraper-Wikipedia-ISO3166/www.scraper.wikipedia.iso3166.sqlite

What is the database schema?

A single SQLite file holds 4 tables:

        countries           subcountries              subcountry_categories    subcountry_info
        ---------           ------------              ---------------------    ---------------
        id                  id                        id                       id
        code2               country_id                name                     country_id
        code3               subcountry_category_id    timestamp                name
        fc_name             fc_name                                            sequence
        has_subcountries    code                                               timestamp
        name                name
        number              sequence
        timestamp           timestamp

An SVG image of the schema is shipped as data/www.scraper.wikipedia.iso3166.schema.svg, and is on-line.

The schema of the countries table is basically taken straight from the big table on ISO_3166-1. Likewise for the subcountry_info table, it's taken from ISO_3166-2.

subcountries.country_id points to countries.id.

fc_name is output from calling fc($name). It's in UTF-8.

For decode(), see "THE PERL ENCODING API" in Encode.

For fc(), see "fc($str)" in Unicode::CaseFold.

$name is from a Wikipedia page.

has_subcountries is 'Yes' or 'No'.

name is in UTF-8.

number is the 3-digit number from the ISO_3166-1 page.

sequence is a number (1 .. N) indicating the order in which records for the same country_id should be accessed.

See the source code of WWW::Scraper::Wikipedia::ISO3166::Database::Create for details of the SQL used to create the tables.

Lastly, in WWW::Scraper::Wikipedia::ISO3166::Database, there are 4 methods for reading the 4 tables, as well as various more general methods.

A Warning about Creating the Database

See also "What is $ENV{AUTHOR_TESTING} used for?" below.

If you run scripts/drop.tables.pl and scripts/create.tables.pl before running scripts/populate.countries.pl and scripts/populate.subcountries, then the primary keys in the tables will start from 1. This is good because it preempts a source of confusion.

Without that step, SQLite will simply increment the primary keys starting from 1 more than was previously used.

What do I do if I find a mistake in the data?

What data? What mistake? How do you know it's wrong?

Also, you must decide what exactly you were expecting the data to be.

If the problem is the ISO data, report it to them.

If the problem is the Wikipedia data, get agreement from everyone concerned and update Wikipedia.

If the problem is the output from my code, try to identify the bug in the code and report it via the usual mechanism. See "Support".

If the problem is with your computer's display of the data, consider (in alphabetical order):

o CSV

Does the file display correctly in 'Emacs'? On the screen using 'less'?

scripts/export.as.csv.pl uses: use open ':utf8';

Is that not working?

o DBD::SQLite

Did you set the sqlite_unicode attribute? Use something like:

        my($dsn)        = 'dbi:SQLite:dbname=www.scraper.wikipedia.iso3166.sqlite'; # Sample only.
        my($attributes) = {AutoCommit => 1, RaiseError => 1, sqlite_unicode => 1};
        my($dbh)        = DBI -> connect($dsn, '', '', $attributes);

The SQLite file ships in the share/ directory of the distro, and must be found by File::ShareDir at run time.

Did you set the foreign_keys pragma (if needed)? Use:

        $dbh -> do('PRAGMA foreign_keys = ON');
o HTML

The template htdocs/assets/templates/www/scraper/wikipedia/iso3166/iso3166.report.tx which ships with this distro contains this line:

        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />

Is that not working?

o Locale

Here's my setup:

        shell>locale
        LANG=en_AU.utf8
        LANGUAGE=
        LC_CTYPE="en_AU.utf8"
        LC_NUMERIC="en_AU.utf8"
        LC_TIME="en_AU.utf8"
        LC_COLLATE="en_AU.utf8"
        LC_MONETARY="en_AU.utf8"
        LC_MESSAGES="en_AU.utf8"
        LC_PAPER="en_AU.utf8"
        LC_NAME="en_AU.utf8"
        LC_ADDRESS="en_AU.utf8"
        LC_TELEPHONE="en_AU.utf8"
        LC_MEASUREMENT="en_AU.utf8"
        LC_IDENTIFICATION="en_AU.utf8"
        LC_ALL=
o OS

Unicode is a moving target. Perhaps your OS's installed version of unicode files needs updating.

o SQLite

Both Oracle and SQLite.org ship a program called sqlite3. They are not compatible. Which one are you using? I use the one from the SQLite.org.

AFAICT, sqlite3 does not have command line options, or options while running, to set unicode or pragmas.

Why did you use Unicode::Normalize's fc() for sorting?

See http://www.perl.com/pub/2012/04, and specifically prescription # 1.

See also section 1.2 Normalization Forms in http://www.unicode.org/reports/tr15/.

See also http://www.unicode.org/faq/normalization.html.

What is $ENV{AUTHOR_TESTING} used for?

When this env var is 1, scripts output to share/*.sqlite within the distro's dir. That's how I populate the database tables. After installation, the database is elsewhere, and read-only, so you don't want the scripts writing to that copy anyway.

At run-time, File::ShareDir is used to find the installed version of *.sqlite.

Wikipedia's Terms of Use ^

See http://wikimediafoundation.org/wiki/Terms_of_use.

Also, since I'm distributing copies of Wikipedia-sourced material, reformatted but not changed by editing, I hereby give notice that their material is released under CC-BY-SA. See http://creativecommons.org/licenses/by-sa/3.0/ for that licence.

See Also ^

Locale::Codes by Sullivan Beck.

References ^

In no particular order:

http://en.wikipedia.org/wiki/ISO_3166-1

http://en.wikipedia.org/wiki/ISO_3166-2

http://savage.net.au/Perl-modules/html/WWW/Scraper/Wikipedia/ISO3166/iso.3166-2.html

http://www.statoids.com/

http://unicode.org/Public/cldr/latest/core.zip

This is complex set of XML files concerning currency, postal, etc, formats and other details for various countries and/or languages.

For Debian etc users: /usr/share/xml/iso-codes/iso_3166_2.xml, as installed from the iso-codes package, with:

        sudo apt-get install iso-codes

http://geonames.org

http://www.geonames.de/index.html

http://www.perl.com/pub/2012/04

Check the Monthly Archives at Perl.com, starting in April 2012, for a series of Unicode-specific articles by Tom Christiansen.

http://www.unicode.org/reports/tr15/

http://www.unicode.org/faq/normalization.html

Repository ^

https://github.com/ronsavage/WWW-Scraper-Wikipedia-ISO3166.git

Support ^

Email the author, or log a bug on RT:

https://rt.cpan.org/Public/Dist/Display.html?Name=WWW::Scraper::Wikipedia::ISO3166.

Author ^

WWW::Scraper::Wikipedia::ISO3166 was written by Ron Savage <ron@savage.net.au> in 2012.

Home page: http://savage.net.au/index.html.

Copyright ^

Australian copyright (c) 2012 Ron Savage.

        All Programs of mine are 'OSI Certified Open Source Software';
        you can redistribute them and/or modify them under the terms of
        The Artistic License, a copy of which is available at:
        http://www.opensource.org/licenses/index.html
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