Fix radix numeric literals (#87)

They didn't fully work before:

$ echo 10r123 | glj
repl:1:6: invalid number: 10r123
$ echo 16rabc | glj
repl:1:6: invalid number: 16rabc

Author: ingydotnet

pkg/reader/reader.go

@@ -1013,7 +1013,7 @@ func (r *Reader) readSymbolicValue() (interface{}, error) {
 
 var (
 	numPrefixRegex = regexp.MustCompile(`^[-+]?([0-9]+|[1-9]+r)`)
-	radixRegex     = regexp.MustCompile(`^[-+]?([1-9]+)r(\d(\d|[a-zA-Z])*N?)$`)
+	radixRegex     = regexp.MustCompile(`^[-+]?([2-9]|[12][0-9]|3[0-6])r([0-9a-zA-Z]+N?)$`)
 	intRegex       = regexp.MustCompile(`^[-+]?\d+N?$`)
 	ratioRegex     = regexp.MustCompile(`^[-+]?\d+\/\d+$`)
 	hexRegex       = regexp.MustCompile(`^[-+]?0[xX]([a-fA-F]|\d)*N?$`)
@@ -1046,6 +1046,7 @@ func (r *Reader) readNumber(numStr string) (interface{}, error) {
 	}
 
 	base := 0 // infer from prefix
+	isRadixNumber := false
 	if match := radixRegex.FindStringSubmatch(numStr); match != nil {
 		sign := ""
 		if numStr[0] == '-' || numStr[0] == '+' {
@@ -1060,9 +1061,10 @@ func (r *Reader) readNumber(numStr string) (interface{}, error) {
 		}
 		base = radix
 		numStr = sign + match[2]
+		isRadixNumber = true
 	}
 
-	if intRegex.MatchString(numStr) || hexRegex.MatchString(numStr) {
+	if isRadixNumber || intRegex.MatchString(numStr) || hexRegex.MatchString(numStr) {
 		if strings.HasSuffix(numStr, "N") {
 			bi, err := lang.NewBigIntWithBase(numStr[:len(numStr)-1], base)
 			if err != nil {

test/glojure/test_glojure/numbers.glj

@@ -376,7 +376,7 @@
   ; divide by zero
   (is (thrown? go/any (rem 9 0)))  ;; TODO: replace w/ arithmetic exception
   (is (thrown? go/any (rem 0 0)))
-  
+
   (are [x y] (= x y)
     (rem 4 2) 0
     (rem 3 2) 1
@@ -407,7 +407,7 @@
     (rem 2 -5) 2
     (rem -2 5) -2
     (rem -2 -5) -2
-    
+
     ; num = 0, div != 0
     (rem 0 3) 0
     (rem 0 -3) 0
@@ -423,7 +423,7 @@
   ; divide by zero
   (is (thrown? go/any (quot 9 0)))  ;; TODO: replace w/ arithmetic exception
   (is (thrown? go/any (quot 0 0)))
-  
+
   (are [x y] (= x y)
     (quot 4 2) 2
     (quot 3 2) 1
@@ -940,4 +940,85 @@ Math/pow overflows to Infinity."
           (/ nan onan)
           (/ onan nan) ))))
 
+(deftest test-arbitrary-base-numbers
+  (testing "Arbitrary base numbers (2r-36r) should work correctly"
+    ;; Test base 2 (binary)
+    (are [x y] (= x y)
+         (read-string "2r1010") 10
+         (read-string "2r1111") 15
+         (read-string "2r1000000") 64)
+
+    ;; Test base 8 (octal)
+    (are [x y] (= x y)
+         (read-string "8r77") 63
+         (read-string "8r100") 64
+         (read-string "8r777") 511)
+
+    ;; Test base 10 (decimal) - should work the same as regular numbers
+    (are [x y] (= x y)
+         (read-string "10r90") 90
+         (read-string "10r123") 123
+         (read-string "10r0") 0)
+
+    ;; Test base 16 (hexadecimal) - the original bug case
+    (are [x y] (= x y)
+         (read-string "16rFF") 255
+         (read-string "16r99") 153
+         (read-string "16rAB") 171
+         (read-string "16r0") 0
+         (read-string "16rABCD") 43981)
+
+    ;; Test base 15 (example from user query)
+    (are [x y] (= x y)
+         (read-string "15rAB3") 2418)
+
+    ;; Test base 36 (maximum supported base)
+    (are [x y] (= x y)
+         (read-string "36rZ") 35
+         (read-string "36r10") 36
+         (read-string "36rZZ") 1295
+         (read-string "36r0") 0
+         (read-string "36rA") 10
+         (read-string "36r9") 9)
+
+    ;; Test with negative numbers
+    (are [x y] (= x y)
+         (read-string "-16rFF") -255
+         (read-string "-36rZ") -35
+         (read-string "-2r1010") -10)
+
+    ;; Test with BigInt suffix N
+    (are [x y] (= x y)
+         (read-string "16rFFN") 255N
+         (read-string "36rZZN") 1295N
+         (read-string "2r1000000N") 64N)
+
+    ;; Test mixed case letters (should be case insensitive)
+    (are [x y] (= x y)
+         (read-string "16rff") 255
+         (read-string "16rFf") 255
+         (read-string "16rfF") 255
+         (read-string "36rz") 35
+         (read-string "36rZz") 1295)))
+
+(deftest test-arbitrary-base-error-cases
+  (testing "Arbitrary base numbers should reject invalid cases"
+    ;; Base 37 should be rejected (max is 36)
+    (is (thrown? go/any (read-string "37rZ")))
+    (is (thrown? go/any (read-string "100r10")))
+
+    ;; Base 0 should be rejected
+    (is (thrown? go/any (read-string "0r10")))
+
+    ;; Invalid digits for the base should be rejected
+    (is (thrown? go/any (read-string "16rG")))  ; G is not valid in base 16
+    (is (thrown? go/any (read-string "10rA")))  ; A is not valid in base 10
+    (is (thrown? go/any (read-string "2r2")))   ; 2 is not valid in base 2
+
+    ;; Empty number part should be rejected
+    (is (thrown? go/any (read-string "16r")))
+
+    ;; Invalid format should be rejected
+    (is (thrown? go/any (read-string "16x10")))))  ; should be 'r' not 'x'
+
 (run-tests)