diff options
Diffstat (limited to 'module/hnh/util')
-rw-r--r-- | module/hnh/util/object.scm | 21 | ||||
-rw-r--r-- | module/hnh/util/type.scm | 46 |
2 files changed, 47 insertions, 20 deletions
diff --git a/module/hnh/util/object.scm b/module/hnh/util/object.scm index 4dbb45a8..4477b462 100644 --- a/module/hnh/util/object.scm +++ b/module/hnh/util/object.scm @@ -1,8 +1,8 @@ (define-module (hnh util object) - :use-module (srfi srfi-1) :use-module (srfi srfi-9 gnu) :use-module (ice-9 curried-definitions) :use-module (hnh util) + :use-module (hnh util type) :export (define-type)) @@ -35,25 +35,6 @@ -;; DSL for specifying type predicates -;; Basically a procedure body, but the variable to test is implicit. -(define-syntax build-validator-body - (syntax-rules (and or list-of) - ((_ variable (and clauses ...)) (and (build-validator-body variable clauses) ...)) - ((_ variable (or clauses ...)) (or (build-validator-body variable clauses) ...)) - ((_ variable (list-of (proc args ...))) - (and (list? variable) - (every (lambda (x) (build-validator-body x (proc args ...))) - variable))) - ((_ variable (list-of proc)) (and (list? variable) - (every proc variable))) - ((_ variable (pair-of a b)) (and (pair? variable) - (build-validator-body (car variable) a) - (build-validator-body (cdr variable) b))) - ((_ variable (proc args ...)) (proc variable args ...)) - ((_ variable proc) (proc variable)))) - - ;; Given (x type: predicate?), expand to a single `unless' form (otherwise #f) (define-syntax (validator stx) (syntax-case stx () diff --git a/module/hnh/util/type.scm b/module/hnh/util/type.scm new file mode 100644 index 00000000..800834e5 --- /dev/null +++ b/module/hnh/util/type.scm @@ -0,0 +1,46 @@ +(define-module (hnh util type) + :use-module ((srfi srfi-1) :select (every)) + :export (build-validator-body + list-of pair-of + typecheck + current-procedure-name)) + +(define-syntax list-of + (syntax-rules () + ((_ variable (rule ...)) + (and (list? variable) + (every (lambda (x) (build-validator-body x (rule ...))) variable))) + ((_ variable rule) + (and (list? variable) + (every rule variable))))) + +(define-syntax-rule (pair-of variable a b) + (and (pair? variable) + (build-validator-body (car variable) a) + (build-validator-body (cdr variable) b))) + +;; DSL for specifying type predicates +;; Basically a procedure body, but the variable to test is implicit. +(define-syntax build-validator-body + (syntax-rules (and or list-of) + ((_ variable (and clauses ...)) (and (build-validator-body variable clauses) ...)) + ((_ variable (or clauses ...)) (or (build-validator-body variable clauses) ...)) + ((_ variable (proc args ...)) (proc variable args ...)) + ((_ variable proc) (proc variable)))) + +(define-syntax-rule (current-procedure-name) + ;; 1 since make-stack is at top of stack + (frame-procedure-name (stack-ref (make-stack #t) 1))) + +(define-syntax typecheck + (syntax-rules () + ((_ variable type-clause) + (let ((procedure-name (current-procedure-name))) + (typecheck variable type-clause procedure-name))) + ((_ variable type-clause procedure-name) + (unless (build-validator-body variable type-clause) + (scm-error 'wrong-type-arg procedure-name + "Invalid value for ~s. Expected ~s, got ~s" + (list (quote variable) (quote type-clause) variable) + #f))))) + |