From 5d42cdd571144b115c01c4cc66a78fb1d34721cd Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Juan=20Manuel=20Tom=C3=A1s?= <jtomas1815@gmail.com>
Date: Fri, 1 May 2026 14:17:22 -0300
Subject: Start to revert dependency on cffi to use native struct handling

---
 header.lisp | 77 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 77 insertions(+)
 create mode 100644 header.lisp

(limited to 'header.lisp')

diff --git a/header.lisp b/header.lisp
new file mode 100644
index 0000000..36b34d9
--- /dev/null
+++ b/header.lisp
@@ -0,0 +1,77 @@
+(in-package #:header)
+
+; TODO: structs/unions, enums, typedefs, handle preprocessor stuff.
+
+(defparser whitespace ()
+  (optional (many (unit #'whitespace?))))
+
+(defparser preprocessor ()
+  (comp ((_ (unit #\#))
+         (keyword (many (unit #'alphanumericp)))
+         (_ whitespace)
+         (body (optional (many (one-of (unit (char/= it #\Newline))
+                                       (comp ((_ (unit #\Backslash))
+                                              (c (unit)))
+                                         c)))))
+         (_ (unit #\Newline)))
+    (cons (coerce keyword 'string) (coerce body 'string))))
+
+(defparser block-comment ()
+  (comp ((_ (literal "/*"))
+         (_ (optional
+              (many
+                (comp ((end? (optional (literal "*/")))
+                       (other (if end?
+                                (fail "Unreachable")
+                                (unit))))
+                  other))))
+         (_ (literal "*/")))
+    nil))
+
+(defparser line-comment ()
+  (comp ((_ (literal "//"))
+         (_ (optional (many (unit (char/= it #\Newline)))))
+         (_ (unit #\Newline)))
+    nil))
+
+(defun valid-char? (c first?)
+  (or (if first?
+        (alpha-char-p c)
+        (alphanumericp c))
+      (some (lambda (x) (char= c x))
+            '(#\_ #\@ #\# #\$))))
+
+(defparser identifier ()
+  (comp ((first (unit (valid-char? it t)))
+         (rest (optional (many (unit (valid-char? it nil))))))
+    (coerce (cons first rest) 'string)))
+
+(defparser function-declaration ()
+  (comp ((type identifier)
+         (_ whitespace)
+         (name identifier)
+         (_ whitespace)
+         (args (within
+                 (unit #\()
+                 (optional (interlinked
+                             (comp ((_ whitespace)
+                                    (type (identifier))
+                                    (_ whitespace)
+                                    (stars (optional (many (unit #\*))))
+                                    (_ whitespace)
+                                    (name (optional identifier))
+                                    (_ whitespace))
+                               (list type (length stars) name))
+                             (unit #\,)))
+                 (unit #\))))
+         (_ whitespace)
+         (_ (unit #\;)))
+    (list type name args)))
+
+(defparser parser ()
+  (optional (many (within whitespace
+                          (one-of block-comment
+                                  line-comment
+                                  preprocessor
+                                  function-declaration))
+                  :all t)))
-- 
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