Text in search queries with examples in Perl 6

Using text in search queries with examples in Perl 6

It is about understanding human language

It is about understanding human language at a limited scale

whoyougle.com

Perl and Wolfram|Alpha

wolframalpha.com

Search queries Italy

Search queries Pisa

Search queries 10 miles in km

Search queries exchange rate of USD

Search queries rate of PHP

Search queries 100 USD in EUR

Search queries 100 £ in €

Scanners (parsers)

100 £ in € Area.pm Length.pm Calendar.pm Money.pm Energy.pm Mass.pm Force.pm Asking in parallel

100 £ in € Area.pm Length.pm Calendar.pm Money.pm Energy.pm Mass.pm Force.pm 120.71

Perl 5.10 is great for parsing

Perl 6 is even more

Named captures in 5.10’s regexes

Grammars in Perl 6

Examples in Perl 5.10 (5.12)

my $sentence = qr/ ^ (?: $Infolavka::Search::Grammar::how_many s (?<to> $currency ) s $Infolavka::Search::Grammar::convert s (?: (?<amount> $Infolavka::Search::Grammar::number ) s )? (?<from> $currency ) )| (?: (?: (?<amount> $Infolavka::Search::Grammar::number ) s )? (?<from> $currency ) s $Infolavka::Search::Grammar::equal )| (?: (?: $rate s )? (?: (?<amount> $Infolavka::Search::Grammar::number ) s? )? (?<from> $currency ) (?: s (?: $Infolavka::Search::Grammar::convert s )? (?<to> $currency ) )? ) $ /xop;

(?<amount> $Search::Grammar::number ) s? )? (?<from> $currency) (?: s (?: $Search::Grammar::convert s )? (?<to> $currency ) )?

(?<amount> $Search::Grammar::number ) s? )? (?<from> $currency) (?: s 100 £ in € (?: $Search::Grammar::convert s )? (?<to> $currency ) )?

(?<amount> 100 $Search::Grammar::number ) s? )? (?<from> $currency) £ (?: s (?: $Search::Grammar::convert in s )? )? (?<to> $currency ) €

Examples in Perl 6

grammar TestGrammar { rule TOP { ^ <sign>? <digit>+ $ } token sign { '-' | '+' } token digit { <[0..9]> } }

while my $string = prompt('> ') { if TestGrammar.parse($string) { say "OK"; } else { say "Failed"; } }

grammar CurrencyGrammar { rule TOP { ^ <rate_question> $ } rule rate_question { 'rate of' <currency_code> } token currency_code { <[A..Z]> ** 3 } }

my $result = CurrencyGrammar.parse($string); if $result { say "OK"; say $<rate_question><currency_code>; }

grammar CurrencyGrammar { rule TOP { ^ <rate_question> $ } rule rate_question { 'rate of'? <currency_code> [<ws> 'to' <ws> <currency_code>]? } token currency_code { <[A..Z]> ** 3 } }

my $result = CurrencyGrammar.parse($string); if $result { say "OK"; my ($from, $to) = $<rate_question><currency_code>; say "$from -> $to"; }

grammar CurrencyGrammar { rule TOP { ^ <rate_question> $ } rule rate_question { 'rate of'? <ws> <money> [<ws> 'to' <currency_code>]? } rule money { [<value> <ws>]? $<code>=(<currency_code>) } token value { <[0..9]>+ } token currency_code { <[A..Z]> ** 3 } }

say "OK"; my $value = $<rate_question><money><value> || 1; my $from = $<rate_question><money><code>; my $to = $<rate_question><currency_code> || 'EUR'; say "$value, $from -> $to";

rule money { [<value> <ws>]? $<code>=(<currency_code>) }

rule money { [<value> <ws>]? <code=currency_code> }

my %rate = EUR => 1, USD => 0.7564, LVL => 1.4116, RUB => 0.02539, PHP => 0.01676, UAH => 0.09587 ; my $codes = %rate.keys.join('|'); say $codes;

my $value = ~$<rate_question><money><value> || 1; my $from = $<rate_question><money><code>; my $to = $<rate_question><currency_code> || 'EUR'; my $ratio = 0 + %rate{~$from} / %rate{~$to}; say $ratio * $value;

my $value = ~$<rate_question><money><value> || 1; my $from = $<rate_question><money><code>; my $to = $<rate_question><currency_code> || 'EUR'; my $ratio = 0 + %rate{~$from} / %rate{~$to}; say $ratio * $value; :-/

Rakudo Star comes with HTTP::Daemon

Dispatching jobs with Gearman

gearman.org

Originally written in Perl

Rewritten in C

Clients in Perl, PHP, Phython, Java, C# (.NET)

Clients in Perl, PHP, Phython, Java, C# (.NET), even MySQL and PostgreSQL

Application Job

Application Job (or task)

Application Job gearmand

Application Job gearmand Job Worker

Application Job gearmand Job Response Worker

Application gearmand Worker Worker Worker

Application gearmand gearmand Worker Worker

Application Application gearmand gearmand Worker Worker

Workers are scalable

Run any number you need

Run on remote servers

Application only talks with gearmand server

Application only talks with gearmand server (one or more)

One or more application

One or more application Applications throw jobs

One or more job servers

One or more job servers Job servers dispatch jobs

One or more workers

One or more workers (clones or different)

One or more workers Workers do jobs

One or more workers Workers do jobs and may issue new jobs

Scalable also means redundant

Really need Gearman?

Really need Gearman? No!

Use HTTP servers instead

__END__ Andrew Shitov talks.shitov.ru | andy@shitov.ru

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Text in search queries with examples in Perl 6

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