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Code Issues 1 Releases Wiki Activity

Make loop macro more expressive

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This commit is contained in:
Calvin Rose 2018-05-26 13:46:27 -04:00
parent 8bcb5e0019
commit 4dc51915a9
2 changed files with 26 additions and 9 deletions
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1
.gitignore vendored
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@ -9,6 +9,7 @@ dst
# Generated files
*.gen.h
*.gen.c
# Generate test files
*.out

34
src/compiler/boot.dst
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@ -68,6 +68,7 @@
(defn fiber? [x] (= (type x) :fiber))
(defn string? [x] (= (type x) :string))
(defn symbol? [x] (= (type x) :symbol))
(defn keyword? [x] (if (not= (type x) :symbol) nil (= 58 (get x 0))))
(defn buffer? [x] (= (type x) :buffer))
(defn function? [x] (= (type x) :function))
(defn cfunction? [x] (= (type x) :cfunction))
@ -224,46 +225,61 @@ value."
(def head1 (ast.unwrap1 head))
(def len (length head1))
(defn doone
[i]
[i preds]
(default preds @['and])
(if (>= i len)
(tuple.prepend body 'do)
(do
(def bindings (get head1 i))
(def ubindings (ast.unwrap1 bindings))
(def verb (ast.unwrap1 (get head1 (+ i 1))))
(def object (ast.unwrap1 (get head1 (+ i 2))))
(if (= (ast.unwrap1 bindings) :where)
(tuple 'if verb (doone (+ i 2)))
(if (keyword? ubindings)
(switch
ubindings
:while (do
(array.push preds verb)
(doone (+ i 2) preds))
:let (tuple 'let verb (doone (+ i 2)))
:when (tuple 'if verb (doone (+ i 2)))
(error ("unexpected loop predicate: " verb)))
(switch
verb
:range (do
(def [start end _inc] (ast.unwrap1 object))
(def inc (if _inc _inc 1))
(def endsym (gensym))
(def preds @['and (tuple < bindings endsym)])
(def subloop (doone (+ i 3) preds))
(tuple 'do
(tuple 'var bindings start)
(tuple 'def endsym end)
(tuple 'while (tuple < bindings endsym)
(doone (+ i 3))
(tuple 'while (apply1 tuple preds)
subloop
(tuple ':= bindings (tuple + bindings inc)))))
:keys (do
(def $dict (gensym "dict"))
(def preds @['and (tuple not= nil bindings)])
(def subloop (doone (+ i 3) preds))
(tuple 'do
(tuple 'def $dict object)
(tuple 'var bindings (tuple next $dict nil))
(tuple 'while (tuple not= nil bindings)
(doone (+ i 3))
(tuple 'while (apply1 tuple preds)
subloop
(tuple ':= bindings (tuple next $dict bindings)))))
:in (do
(def $len (gensym "len"))
(def $i (gensym "i"))
(def $indexed (gensym "indexed"))
(def preds @['and (tuple < $i $len)])
(def subloop (doone (+ i 3) preds))
(tuple 'do
(tuple 'def $indexed object)
(tuple 'def $len (tuple length $indexed))
(tuple 'var $i 0)
(tuple 'while (tuple < $i $len)
(tuple 'while (apply1 tuple preds)
(tuple 'def bindings (tuple get $indexed $i))
(doone (+ i 3))
subloop
(tuple ':= $i (tuple + 1 $i)))))
(error ("unexpected loop verb: " verb)))))))
(doone 0))