1 files changed, 23 insertions, 1 deletions
diff --git a/src/sexp.c b/src/sexp.c
index b268414..5e80d07 100644
--- a/src/sexp.c
+++ b/src/sexp.c
@@ -1,8 +1,30 @@
 #include "sexp.h"
 #include "algds/vec.h"
 
+#include <inttypes.h>
+
+void SExpRef_show(SExpRef self, FILE* fp) { }
+
 void SExp_show(SExp self, FILE* fp) {
-    fprintf(fp, "{SEXP}");
+    if (self.type == kEmptySExp) fprintf(fp, "<EMPTY>");
+    else if (self.type == kIntegerSExp) fprintf(fp, "%"PRId64, self.integer);
+    else if (self.type == kRealSExp) fprintf(fp, "%lf", self.real);
+    else if (self.type == kBooleanSExp) {
+        if (self.boolean) fprintf(fp, "#t");
+        else fprintf(fp, "#f");
+    } else if (self.type == kNilSExp) fprintf(fp, "()");
+    else if (self.type == kCharSExp) fprintf(fp, "#\\%c", self.character);
+    else if (self.type == kStringSExp) fprintf(fp, "\"%s\"", self.str);
+    else if (self.type == kSymbolSExp) fprintf(fp, "'%s", self.str);
+    else if (self.type == kUserDataSExp) fprintf(fp, "<%p>", self.userdata);
+    else if (self.type == kFuncSExp) fprintf(fp, "<FUNCTION>");
+    else if (self.type == kPairSExp) {
+        fprintf(fp, "(<%d> . <%d>)", self.pair.car.idx, self.pair.cdr.idx);
+    }
+    else if (self.type == kEnvSExp) fprintf(fp, "<Env>");
+    else if (self.type == kBindingSExp) fprintf(fp, "<BINDING>");
+    else if (self.type == kMacroSExp) fprintf(fp, "<MACRO>");
 }
 
 VECTOR_IMPL(SExp);
+VECTOR_IMPL(SExpRef);