For questions about the syntax-rules macro facility of the Scheme programming language.
Questions tagged [syntax-rules]
21 questions
1
vote
1 answer
Why is my (guile) scheme macro evaluating its argument?
Within Guile, I am trying to learn define-syntax and syntax-rules. I was under the impression that scheme macros do not evaluate their arguments, but it seems like mine is doing so:
(define-syntax foo
(syntax-rules ()
((foo word)
…
beguiler
- 13
- 3
1
vote
1 answer
Scheme syntax-rules matching any number of pattern variable before a literal?
I'm trying to write a macro that substitutes some literal in an expression with a value,
such as (substitute 3 (+ 4 1 _ 1 5))
This is what I have so far,
(define-syntax substitute
(syntax-rules (_)
((substitute val (_ e1 ...))
(val e1…
Absolute Negativity
- 29
- 5
1
vote
1 answer
Provide syntax-rule Racket
How do I provide syntax rules in racket?
I have code which is similar to this:
(define-syntax SELECT
(syntax-rules (FROM WHERE star)
[(SELECT colnames FROM relnames)
...]
[(SELECT colnames FROM relnames WHERE . expression)
…
Atonic
- 509
- 1
- 5
- 14
1
vote
2 answers
How clojure macro parses special symbol?
When I re-implement a macro written in Scheme with Clojure, I get into a trouble.
The macro tries to load pairs of testing data into a all-tests var for later use.
Because the arguments for the macro is variable-length and contains special undefined…
GZ92
- 151
- 1
- 10
0
votes
0 answers
Is it possible to define anaphoric macros using syntax-rules only?
Is possible to write anaphoric macros (e.g. aif) using syntax-rules only? Such a macro would need to break the hygiene of the macro system. I know that this is possible with syntax-case, but is it somehow possible with syntax-rules in R5RS and…
Flux
- 9,805
- 5
- 46
- 92
0
votes
1 answer
Introducing a Named Variable with Syntax Rules
I am trying to write a super-tiny Object-oriented system with syntax-rules, mostly just to learn it. Anyway, I am trying to introduce a "this" variable. Here is what I would like to be able to do:
(oo-class Counter
(
(attr value 0)
…
johnnyb
- 622
- 5
- 17