bugfix: fail gracefully when parens are uneven

1 files changed, 7 insertions, 1 deletions

diff --git a/neb/parser.py b/neb/parser.py
index 5352ee5..08ab0be 100644
--- a/neb/parser.py
+++ b/neb/parser.py
@@ -1,4 +1,6 @@
 from .structs import *
+from .exceptions import ParseError
+
 
 def parseExpression(token, prev, tokens):
     idx = 0
@@ -6,6 +8,8 @@ def parseExpression(token, prev, tokens):
     prev = token
     while tokens[idx].type_ != TokenType.CLOSE_PAREN:
         token = tokens[idx]
+        if token.type_ == TokenType.EOF:
+            raise ParseError("uneven parens: not enough closing!", token.line)
         inc = 1
         if token.type_ == TokenType.OPEN_PAREN:
             expr, inc = parseExpression(token, prev, tokens[idx+1:])
@@ -49,7 +53,9 @@ def parse(tokens):
     while tokens[idx].type_ != TokenType.EOF:
         token = tokens[idx]
         counter = 1
-        if token.type_ == TokenType.OPEN_PAREN:
+        if token.type_ == TokenType.CLOSE_PAREN:
+            raise ParseError("uneven parens: too many closing!", token.line)
+        elif token.type_ == TokenType.OPEN_PAREN:
             expr, counter = parseExpression(token, prev, tokens[idx+1:])
             exprs.append(expr)
         elif token.type_ in (TokenType.FALSE, TokenType.TRUE, TokenType.STRING, TokenType.INT, TokenType.FLOAT):