DSL premises
and only then for computers
Code is written for
people
Objects ---> Vocabulary
Grammar ---> Language
Domain Driven Design
DSL
DSL is advanced stuff
DSL example(by Martin Fowler)
DSL is a computer language with:
human language nature
limited expressiveness
domain focus
DSL types
internal external
language workbench
Internal DSLexample
External DSLexample
Language workbenchexample
More examples
regular expressions
CSSSQL
all XML
Unix config filesRuby on Rails
mocking frameworks
wiki syntax / markdown
LINQ
Using internal DSL(aka Fluent Interface)
Easy to do... no parsers, etc.
Full IDE support
Good
BadLimited by host language
Method chaining
Object scoping
Expression Builder
Using external DSL
Unlimited expressiveness
You choose execution environment
Good
Bad
Requires “more” work
No IDE support
DSLscript
parse
AST Semantic model
optional
You can parse DSL
manually (regexp, Tokenizer)
using some tool(ANTLR, yacc, ...)
Using Language Workbenches
Meta Programming System
Microsoft Oslo
Intentional Domain Workbench
Eclipse Modeling Project
concepts(language)
edit
you
AST(DSL script)
concepts(language)
edit
describe
you
AST(DSL script)
concepts(language)
edit
edit
describe
“user”
you
AST(DSL script)
concepts(language)
edit
describe
“user”
you
no text, just AST !
edit
useful stuff
(like java code)
AST(DSL script)
concepts(language)
edit
describe
transformed
“user”
you
edit
Module Project
Module Project
Solution
Language
Generator
DevKit
kind of
Model Module Project
Solution
Language
Generator
DevKit
kind of
Node Model Module Project
Solution
Language
Generator
DevKit
kind ofincludes
Conceptdefined
by
Internal DSLs rule! :)
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