Add some documentation to the abi

[scheme.git] / ast.scm

diff --git a/ast.scm b/ast.scm
index 8dac3b68833ca430d27015b8a97263a72c531f37..a0899192e21a1d44b0fe3296e380604133a3f1d2 100644 (file)
--- a/ast.scm
+++ b/ast.scm
@@ -7,6 +7,7 @@
       ('! #t)
       ('= #t)
       ('bool->int #t)
+      ('print #t)
       (else #f)))
   (cond
    ((list? x)
@@ -15,14 +16,23 @@
       ('let 'let)
       ('lambda 'lambda)
       ('closure 'closure) ; only available in codegen
+      ('static-string 'static-string) ; only available in codegen
       (else 'app)))
    ((builtin? x) 'builtin)
    ((symbol? x) 'var)
    ((integer? x) 'int-literal)
-   ((boolean? x) 'bool-literal)))
+   ((boolean? x) 'bool-literal)
+   ((string? x) 'string-literal)))
 
-;; (define (ast-recurse f x)
-;;   (cond (
+(define (ast-traverse f x)
+  (case (ast-type x)
+    ('let `(let ,(map (lambda (x) (list (car x) (f (cadr x))))
+                     (let-bindings x))
+            ,@(map f (let-body x))))
+    ('app (map f x))
+    ('lambda `(lambda ,(lambda-args x) ,(f (lambda-body x))))
+    ('if `(if ,@(map f (cdr x))))
+    (else x)))
 
 (define let-bindings cadr)
 (define let-body cddr)