Exploring Types and DSL Tools in Lectures
Goals of my lectures
•
A way of adding types
•
DSL-making “tools”
•
Another DSL example
Goals of my lectures
•
A way of adding types
•
DSL-making “tools”
•
Another DSL example
•
Last time:
•
type-of, type=?, assign-type
•
define-type
•
check-type
•
#%datum
•
add1
•
This time:
•
#%app
•
lambda
•
Type constructors
•
Type checking types
Goals of my lectures
•
A way of adding types
•
DSL-making “tools”
•
Another DSL example
•
Last time (basic):
•
syntax-parse
•
Syntax objects
•
Syntax properties
•
Interposition:
#%app
,
#%datum
•
Today (deep end):
•
Phasing
•
Pattern expanders
•
Id macros
•
Syntax classes
•
Definition contexts
Goals of my lectures
•
A way of adding types
•
DSL-making “tools”
•
Another DSL example
•
Next time
Id macros are tricky!
•
Racket macro expansion algorithm:
•
For syntax object
#’(x y z)
:
•
If
x
is macro
•
Pass
#’(x y z)
to syntax transformer registered as macro
x
•
Else
•
Pass
#’(#%app x y z)
to
#%app
macro
•
Ambiguity: what if
x
= id macro that expands to
add1
•
We want to invoke
x
macro on just
x
,
•
but algorithm doesn’t do that
Delve into the realm of types and Domain-Specific Language (DSL) tools through various examples and discussions in academic lectures. The journey includes understanding, defining, and checking types to enhance knowledge and skills in DSL-making processes.
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Presentation Transcript
Goals of my lectures A way of adding types DSL-making tools Another DSL example
Goals of my lectures A way of adding types DSL-making tools Another DSL example Last time: type-of, type=?, assign-type define-type check-type #%datum add1 This time: #%app lambda Type constructors Type checking types
Goals of my lectures A way of adding types DSL-making tools Another DSL example Last time (basic): syntax-parse Syntax objects Syntax properties Interposition: #%app, #%datum Today (deep end): Phasing Pattern expanders Id macros Syntax classes Definition contexts
Goals of my lectures A way of adding types DSL-making tools Another DSL example Next time
Id macros are tricky! Racket macro expansion algorithm: For syntax object # (x y z): If x is macro Pass # (x y z) to syntax transformer registered as macro x Else Pass # (#%app x y z) to #%app macro Ambiguity: what if x = id macro that expands to add1 We want to invoke x macro on just x, but algorithm doesn t do that
