From d5d5e9c48a1583960ddb2db550e947926f9f869e Mon Sep 17 00:00:00 2001
From: mryouse
Date: Thu, 12 May 2022 02:12:48 +0000
Subject: type compare and Any type

---
 std.py    | 14 +++++++++++++-
 tokens.py |  2 +-
 2 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/std.py b/std.py
index 1393acf..26c6793 100644
--- a/std.py
+++ b/std.py
@@ -66,6 +66,13 @@ def std_if(cond, t_branch, f_branch):
         ret = evaluate_expression(f_branch)
     return ret
 
+# type validation
+def std_is_string(arg):
+    if isinstance(arg, NebString):
+        return NebBool(True)
+    else:
+        return NebBool(False)
+
 def evaluate_expression(expr):
     if not expr.symbol.name in STD:
         raise Exception(f"no such symbol: {expr.symbol.name}")
@@ -83,6 +90,7 @@ def evaluate_expression(expr):
             if isinstance(in_sig[idx], sig[idx]):
                 validated += 1
         if validated == len(sig):
+            print(f"{value.func.args}")
             ret = value.impl(*(expr.args))
             return ret
 
@@ -122,7 +130,11 @@ def build_std():
     STD["concat"] = [concat_string_string]
 
     # flow control
-    if_bool_expr_expr = FuncImpl(NebFunction("if", [NebBool, NebExpression, NebExpression], NebType.ANY), std_if)
+    if_bool_expr_expr = FuncImpl(NebFunction("if", [NebBool, NebExpression, NebExpression], NebAny), std_if)
     STD["if"] = [if_bool_expr_expr]
 
+    # type checking
+    is_string = FuncImpl(NebFunction("string?", [NebAny], NebBool), std_is_string)
+    STD["string?"] = [is_string]
+
 build_std()
diff --git a/tokens.py b/tokens.py
index a8f6268..66fb98d 100644
--- a/tokens.py
+++ b/tokens.py
@@ -31,7 +31,7 @@ class NebAny(NebBaseType):
     def __init__(self, type_name, type_):
         super().__init__("any", NebType.ANY)
 
-class NebLiteral(NebBaseType):
+class NebLiteral(NebAny):
 
     def __init__(self, type_name, type_, value):
         super().__init__(type_name, type_)
-- 
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