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authorJuan Manuel Tomás <jtomas1815@gmail.com>2024-11-08 15:06:17 -0300
committerJuan Manuel Tomás <jtomas1815@gmail.com>2024-11-08 15:06:17 -0300
commit688ade34430eb1d4d205698cae810c35c8f44d21 (patch)
treefe3e043c28eaf9beafe8f0be60c0ad6b43fe84bb /core.lisp
parent4e25074286e83a9e7b980e931284ad795361de94 (diff)
downloadmonparser-688ade34430eb1d4d205698cae810c35c8f44d21.tar.gz
monparser-688ade34430eb1d4d205698cae810c35c8f44d21.zip
Turn bind and one-of into macros to avoid eagerly evaluating argumentsHEADmain
Diffstat (limited to 'core.lisp')
-rw-r--r--core.lisp54
1 files changed, 27 insertions, 27 deletions
diff --git a/core.lisp b/core.lisp
index 2870f7b..4ba3cd7 100644
--- a/core.lisp
+++ b/core.lisp
@@ -30,33 +30,33 @@
:message (format nil "Expected: ~a, Got: ~a" ',predicate it))))
(make-failure :place input :message "Reached end of input."))))
-(defun one-of (first-parser second-parser &rest other-parsers)
- (lambda (input &key lazy)
- (declare (ignore lazy))
- (labels ((one-of-rec (parsers)
- (let ((intermediate-parsers '())
- (result (make-failure :place input
- :message "Exhausted options.")))
- (dolist (p parsers)
- (let ((r (funcall p
- input
- :lazy (> (length parsers) 1))))
- (cond ((functionp r)
- (push r intermediate-parsers))
- ((parsing-p r)
- (when (or (not (parsing-p result))
- (> (input-cursor (parsing-left r))
- (input-cursor (parsing-left result))))
- (setf result r)))
- ((failure-p r)
- (when (or (failure-p result)
- (= (length parsers) 1))
- (setf result r)))
- (t (error (format nil "Invalid return value: ~a" r))))))
- (if intermediate-parsers
- (one-of-rec intermediate-parsers)
- result))))
- (one-of-rec (cons first-parser (cons second-parser other-parsers))))))
+(defmacro one-of (first-parser second-parser &rest other-parsers)
+ `(lambda (input &key lazy)
+ (declare (ignore lazy))
+ (labels ((one-of-rec (parsers)
+ (let ((intermediate-parsers '())
+ (result (make-failure :place input
+ :message "Exhausted options.")))
+ (dolist (p parsers)
+ (let ((r (funcall p
+ input
+ :lazy (> (length parsers) 1))))
+ (cond ((functionp r)
+ (push r intermediate-parsers))
+ ((parsing-p r)
+ (when (or (not (parsing-p result))
+ (> (input-cursor (parsing-left r))
+ (input-cursor (parsing-left result))))
+ (setf result r)))
+ ((failure-p r)
+ (when (or (failure-p result)
+ (= (length parsers) 1))
+ (setf result r)))
+ (t (error (format nil "Invalid return value: ~a" r))))))
+ (if intermediate-parsers
+ (one-of-rec intermediate-parsers)
+ result))))
+ (one-of-rec (list ,first-parser ,second-parser ,@other-parsers)))))
(defmacro comp (bindings &body body)
(if (null bindings)