Added modulo operator '%'

- added OP_MOD, which performs a modulo operation on the 2 <number> values on the stack. Pops the 2 values and pushes the result.
- also added TOKEN_PERCENT to the lexer, and extended binary() in cparse.c to support it.

src/cvm.c

@@ -6,6 +6,8 @@
 #include <stdarg.h>
 #include <string.h>
 
+#include <math.h>
+
 COSMO_API void cosmoV_pushFString(CState *state, const char *format, ...) {
     va_list args;
     va_start(args, format);
@@ -802,6 +804,18 @@ int cosmoV_execute(CState *state) {
                 NUMBEROP(cosmoV_newNumber, /)
                 break;
             }
+            case OP_MOD: {
+                StkPtr valA = cosmoV_getTop(state, 1);
+                StkPtr valB = cosmoV_getTop(state, 0);
+                if (IS_NUMBER(*valA) && IS_NUMBER(*valB)) {
+                    cosmoV_setTop(state, 2); /* pop the 2 values */
+                    cosmoV_pushValue(state, cosmoV_newNumber(fmod(cosmoV_readNumber(*valA), cosmoV_readNumber(*valB))));
+                } else { \
+                    cosmoV_error(state, "Expected numbers, got %s and %s!", cosmoV_typeStr(*valA), cosmoV_typeStr(*valB));
+                    return -1; \
+                } \
+                break;
+            }
             case OP_NOT: {
                 cosmoV_pushBoolean(state, isFalsey(cosmoV_pop(state)));
                 break;