Business Natural Languages Development In Ruby

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The document discusses Business Natural Language (BNL) which aims to allow business users to specify business logic in a natural language format. BNL is a type of domain-specific language that sits between natural language and traditional programming languages. An example shows how a BNL rule for awarding loyalty points based on flight class can be translated into code. The benefits of BNL include improved efficiency and reduced time to market by allowing business users rather than just developers to specify logic.

Technology

Business Natural
Language (BNL)
Jay Fields
http://jayﬁelds.com

Beneﬁts
Managers
-Improve efﬁciency by
distributing workload

Beneﬁts
Developers
-Technical Decisions
not Business Details

Domain Speciﬁc Languages

YACC Excel Macros

Ruby on Rails
Cobol
Rake XML
etc...

The Difference
• Natural Language
• Written by the Business
- subject matter experts

Speciﬁcation
Award 2 points if the fare
class is A, C, D, J, Z

Code
account.award 2.points if
[A, C, D, J, Z].include?
fare

Code
Award 2 points if the fare
class is A, C, D, J, Z

Award 2 points if the fare
class is A, C, D, J, Z

Award 2 points if the fare
class is A, C, D, J, Z

account.award 2.points if
[A, C, D, J, Z].include?
fare

Award 2 points if the
fare class is A, C, D, J, Z

•account.instance_eval

Award 2 points if the
fare class is A, C, D, J, Z

•rule.gsub /^A/, “a”

award 2 points if the
fare class is A, C, D, J, Z

• rule.gsub /d /, ‘1.’

award 2.points if the
fare class is A, C, D, J, Z

•rule.gsub /class/, ‘’

award 2.points if the
fare is A, C, D, J, Z

•rule.gsub /class/, ‘’

award 2.points if the
fare is A, C, D, J, Z

•rule.gsub /([A-Z, ]+)/,
'[1]'

award 2.points if the
fare is [ A, C, D, J, Z ]

•rule.gsub /if the ([a-z]
+) is([.+])/, 'if
2.include? 1'

award 2.points if
[ A, C, D, J, Z].include? fare

•rule.gsub /if the ([a-z]
+) is([.+])/, 'if
2.include? 1'

award 2.points if
[ A, C, D, J, Z].include? fare

award 2.points if
[ A, C, D, J, Z].include? fare

account.award 2.points if
[A, C, D, J, Z].include? fare

award 2.points if
[ A, C, D, J, Z].include? fare

account.award 2.points if
[A, C, D, J, Z].include? fare
Speciﬁcation == Code

Descriptive And
Maintainable
Phrases (DAMP)

quot;A change that used to
take 3-4 days now takes
about 10 minutes.quot;

First Class /
Business Class / A, C, D, J, R, Z 2
BusinessFirst

Full Fare
Y, H 2
Economy Class

K, M, N, B,
Economy Class 1
O,V, U

BNL
When the fare class
is A, C, D, J, R, or Z
then award 2 points

When the fare class is A, C,
D, J, R, or Z then award 2
points

When the fare class is A, C,
D, J, R, or Z then award 2
points
rule.gsub /the fare class is /, ‘’

When A, C, D, J, R, or Z then
award 2 points

When A, C, D, J, R, or Z
then award 2 points

When A, C, D, J, R, or Z
then award 2 points

rule.gsub /^W/, ‘w’

when A, C, D, J, R, or Z then
award 2 points

when A, C, D, J, R, or Z then
award 2 points

rule.gsub / or /, ‘ ’

when A, C, D, J, R, Z then
award 2 points

when A, C, D, J, R, Z then
award 2 points

when A, C, D, J, R, Z then
award 2 points

rule.gsub /award /, ‘’

when A, C, D, J, R, Z then 2
points

when A, C, D, J, R, Z then 2
points

rule.gsub / points/, ‘’

when A, C, D, J, R, Z then 2

when A, C, D, J, R, Z then 2

rule.gsub /([A-Z])/,
'FareClass::1'

when FareClass::A,
FareClass::C, FareClass::D,
FareClass::J, FareClass::R,
FareClass::Z then 2

BusinessLogic.rules returns the
rules from the DB

Approver
Developer

Business

Production

Absolutely Not

•Language Workbench
•Syntax Checking

Absolutely Not

•Language Workbench
•Syntax Checking
•Test Environment

Absolutely Not

•Language Workbench
•Syntax Checking
•Test Environment
•Approval Workﬂow

Syntax Checking
When the fare class is A, C,
D, J, R, or Z then award 2
points

Syntax Checking
When the far

Did you mean ‘fare class’?

Commercial
Language
Workbenches
MPS - JetBrains
Intentional

Questions

bnl@jayﬁelds.com
Jay Fields
http://www.jayﬁelds.com

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