go: step1_read_print print working.

1 files changed, 35 insertions, 0 deletions

diff --git a/go/src/printer/printer.go b/go/src/printer/printer.go
new file mode 100644
index 0000000..83d4c84
--- /dev/null
+++ b/go/src/printer/printer.go
@@ -0,0 +1,35 @@
+package printer
+
+import (
+    "fmt"
+    "strings"
+)
+
+import (
+    "types"
+)
+
+func Pr_str(obj types.MalType, print_readably bool) string {
+    switch tobj := obj.(type) {
+    case types.List:
+        str_list := make([]string, 0, len(tobj.Val))
+        for _, e := range tobj.Val {
+            str_list = append(str_list, Pr_str(e, print_readably))
+        }
+        return "(" + strings.Join(str_list, " ") + ")"
+    case string:
+        if print_readably {
+            // TODO: quote backslash, quote, and newline
+            return `"` + fmt.Sprintf("%v", obj) + `"`
+        } else {
+            return fmt.Sprintf("%v", obj)
+        }
+    case types.Symbol:
+        return tobj.Val
+    case nil:
+        return "nil"
+    default:
+        return fmt.Sprintf("%v", obj)
+    }
+    return "<printed>"
+}