spoofax: ontwikkeling van domeinspecifieke talen in eclipse
TRANSCRIPT
The SpoofaxLanguage Workbench
Eelco VisserLennart Kats
Spoofax tutorial hands-on material: www.strategoxt.org/Spoofax/Devnology
Spoofax
hands-on material:www.strategoxt.org/Spoofax/Devnology
Domain-Specific Languages (DSLs)
Domain:
• Mobile phone
• Web
• Financial
• Printer design
• ...
Spoofax tutorial hands-on material: www.strategoxt.org/Spoofax/Devnology
Can offer:
• Specialized syntax
• Specialized analysis
• Specialized optimizations
• Platform independence
Example DSL:
Spoofax tutorial hands-on material: www.strategoxt.org/Spoofax/Devnology
Syntax definition
★ concrete + abstract syntax
Static semantics
★ error checking
★ name resolution
★ type analysis
Model-to-model transformation
★ express constructs in core language
Code generation
★ translate core language models to implementation
Problem: building DSLs
parser generators
meta-programming
languages
meta-programming
libraries
templateengines
Spoofax tutorial hands-on material: www.strategoxt.org/Spoofax/Devnology
Problem: building DSLs (ct’d)
Spoofax tutorial hands-on material: www.strategoxt.org/Spoofax/Devnology
Editor Services
syntactic editor services
• syntax highlighting
• syntax checking
• outline view
• bracket matching, insertion
• automatic indentation
• syntax completion
• ...
semantic editor services
• error marking
• reference resolving
• hover help
• mark occurrences
• content completion
• refactoring
• ...
Spoofax tutorial hands-on material: www.strategoxt.org/Spoofax/Devnology
Syntax definition
Static semantics
Model-to-model transformation
Code generation
Syntactic Editor Services
Semantic Editor Services
} Spoofax
how can we make these things cheaply?
Spoofax tutorial hands-on material: www.strategoxt.org/Spoofax/Devnology
• <spoofax screenshot: lang def and lang use in Eclipse workspace>
Spoofax tutorial hands-on material: www.strategoxt.org/Spoofax/Devnology
#1 Syntax definition
• Basic expression language
1+2+3
Expr “+” Expr -> Expr {cons(“Plus”)}
Spoofax tutorial hands-on material: www.strategoxt.org/Spoofax/Devnology
#1 Syntax definition
• Basic expression language
1+2+3
21
3
++
213
++
is that or ?
what does the abstract syntax view say?
#1 Syntax definition
• Basic expression language
1+2*3
21
3
+
*21
3*is that or ?
what does the abstract syntax view say?
+
The Spoofax Solution:Declarative Syntax with SDF
Declarative, explicit disambigation rules
Clean abstract syntax
Composable syntax definitions
#2 Transformation
Tip. Some other operators:subtS, mulS, divS, gt, lt, eq
Transform 1+2 to <addition of> 1 and 2:
calc:
Add(Int(i), Int(j)) -> Int(<addS> (i, j))
#2 Transformation
Transform 1+2 to <addition of> 1 and 2:
calc:
Add(Int(i), Int(j)) -> Int(<addS> (i, j))
calculate = bottomup(try(calc))
Tip. Some other operators:subtS, mulS, divS, gt, lt, eq
#3 Equations
New syntax
New semantics
x = 2
y = 3
result = 90 * x + 30 * y
#3 Equations
x = 2
y = 3
result = 90 * x + 30 * y
Assign(“x”, INT(2))
calc: Assign(x, e) -> e
where rules(GetValue: x -> e)
calc: Var(x) -> <GetValue> x
New syntax
New semantics
x = 2
y = 3
result = 90 * x + 30 * z
#4 Error markers
(Var(“z”), “Variable z is not defined”)
transform
#4 Error markers
analyze = topdown(try(record-var))
record-var: Assign(x, e) -> Assign(x, e) with rules( GetVar :+ x -> e )
constraint-errors = collect-all(constraint-error, conc) constraint-error: Var(x) -> (x, $[Variable [x] is not defined]) where not(<GetVar> x)
#4 Error markers#5 Refinement
analyze = topdown(try(record-var))
record-var: Assign(x, e) -> Assign(x, e) with rules( GetVar :+ x -> e )
constraint-errors = collect-all(constraint-error, conc) constraint-error: Var(x) -> (x, $[Variable [x] is not defined]) where not(<GetVar> x)
#4 Error markers#5 Refinement
editor-resolve: (Var(x), position, ast, path, project-path) -> target where target := <GetVar> x
editor-complete: (Var(x), position, ast, path, project-path) -> proposals where proposals := <all-keys-GetVar> x
Refinement & Free play
Syntax definition
Static semantics
Model-to-model transformation
Code generation
Syntactic Editor Services
Semantic Editor Services
} Spoofax
www.spoofax.org