1 files changed, 27 insertions, 0 deletions
diff --git a/nim/printer.nim b/nim/printer.nim
new file mode 100644
index 0000000..95eb840
--- /dev/null
+++ b/nim/printer.nim
@@ -0,0 +1,27 @@
+import strutils, sequtils, tables, types
+
+proc str_handle(x: string, pr = true): string =
+  if x.len > 0 and x[0] == '\xff':
+            result = ":" & x[1 .. x.high]
+  elif pr:  result = "\"" & x.replace("\\", "\\\\").replace("\"", "\\\"") & "\""
+  else:     result = x
+
+proc pr_str*(m: MalType, pr = true): string =
+  case m.kind
+  of Nil:     result = "nil"
+  of True:    result = "true"
+  of False:   result = "false"
+  of Fun:     result = "#<function>"
+  of MalFun:  result = "#<malfun>"
+  of Atom:    result = "(atom " & m.val[].pr_str & ")"
+  of Symbol:  result = m.str
+  of String:  result = m.str.str_handle(pr)
+  of Number:  result = $m.number
+  of List:    result = "(" & m.list.mapIt(string, it.pr_str(pr)).join(" ") & ")"
+  of Vector:  result = "[" & m.list.mapIt(string, it.pr_str(pr)).join(" ") & "]"
+  of HashMap:
+    result = "{"
+    for key, val in m.hash_map.pairs:
+      if result.len > 1: result.add " "
+      result.add key.str_handle & " " & val.pr_str(pr)
+    result.add "}"