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Implemented quasiquoting as a vau!

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This commit is contained in:
Nathan Braswell
2020-08-28 00:38:16 -04:00
parent a5f15f70f8
commit 241b4ca3f4
2 changed files with 56 additions and 1 deletions
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38
k_prime.krak
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@@ -789,6 +789,32 @@ fun main(argc: int, argv: **char): int {
return KPResult::Ok(kpNil())
}));
env->set(str("symbol?"), make_builtin_combiner(str("symbol?"), fun(params: vec<KPValue>, dynamic_env: *KPEnv): KPResult {
if params.size != 1 {
return KPResult::Err(kpString(str("Need 1 param to symbol?")))
}
var ip = EVAL(dynamic_env, params[0])
if is_err(ip) {
return ip
}
return KPResult::Ok(kpBool(get_value(ip).is_symbol()))
}));
env->set(str("get-text"), make_builtin_combiner(str("get-text"), fun(params: vec<KPValue>, dynamic_env: *KPEnv): KPResult {
if params.size != 1 {
return KPResult::Err(kpString(str("Need 1 param to get-text")))
}
var ip = EVAL(dynamic_env, params[0])
if is_err(ip) {
return ip
}
var iv = get_value(ip)
if !iv.is_symbol() {
return KPResult::Err(kpString(str("Called get-text with not a symbol")))
}
return KPResult::Ok(kpString(iv.get_symbol_text()))
}));
env->set(str("vector"), make_builtin_combiner(str("vector"), fun(params: vec<KPValue>, dynamic_env: *KPEnv): KPResult {
var evaled_params = vec<KPValue>()
for (var i = 0; i < params.size; i++;) {
@@ -800,6 +826,16 @@ fun main(argc: int, argv: **char): int {
}
return KPResult::Ok(kpVector(evaled_params))
}));
env->set(str("vector?"), make_builtin_combiner(str("vector?"), fun(params: vec<KPValue>, dynamic_env: *KPEnv): KPResult {
if params.size != 1 {
return KPResult::Err(kpString(str("Need 1 param to vector?")))
}
var ip = EVAL(dynamic_env, params[0])
if is_err(ip) {
return ip
}
return KPResult::Ok(kpBool(get_value(ip).is_vector()))
}));
env->set(str("len"), make_builtin_combiner(str("len"), fun(params: vec<KPValue>, dynamic_env: *KPEnv): KPResult {
if params.size != 1 {
return KPResult::Err(kpString(str("Need 1 param to len")))
@@ -852,7 +888,7 @@ fun main(argc: int, argv: **char): int {
return ip
}
var v = get_value(ip)
if !v.is_vector() { return KPResult::Err(kpString(str("Param ") + i + " to concat is not vector")); }
if !v.is_vector() { return KPResult::Err(kpString(str("Param ") + i + " to concat is not vector: " + pr_str(v, false))); }
to_ret += v.get_vector_rc().get()
}
return KPResult::Ok(kpVector(to_ret))

19
quasi.kp Normal file
View File

@@ -0,0 +1,19 @@
(fun print_through (x) (let (_ (println x)) x))
(fun is_pair? (x) (and (vector? x) (> (len x) 0)))
(set! quasiquote (vau de (x)
(cond (is_pair? x)
(cond (and (symbol? (idx x 0)) (= (get-text (idx x 0)) "unquote"))
(eval (idx x 1) de)
true
(cond (and (is_pair? (idx x 0)) (symbol? (idx (idx x 0) 0)) (= (get-text (idx (idx x 0) 0)) "splice-unquote"))
(concat (eval (idx (idx x 0) 1) de) (apply quasiquote [(slice x 1 -1)] de))
true
(concat [(apply quasiquote [(idx x 0)] de)] (apply quasiquote [(slice x 1 -1)] de))))
true x)))
(add_grammar_rule 'form '("`" optional_WS form) (lambda (_ _ f) ['quasiquote f]))
(add_grammar_rule 'form '("~" optional_WS form) (lambda (_ _ f) ['unquote f]))
(add_grammar_rule 'form '("," optional_WS form) (lambda (_ _ f) ['splice-unquote f]))