Fixed SyaNodeParser false positive recognition issue

tests/core/test_tokenizer.py

@@ -4,7 +4,7 @@ from core.tokenizer import Tokenizer, Token, TokenKind, LexerError, Keywords
 
 def test_i_can_tokenize():
     source = "+*-/{}[]()    ,;:.?\n\n\r\r\r\nidentifier_0\t  \t10.15 10 'string\n' \"another string\"=|&<>c:name:"
-    source += "$£€!_identifier°~_^\\`==#"
+    source += "$£€!_identifier°~_^\\`==#__var__10"
     tokens = list(Tokenizer(source))
     assert tokens[0] == Token(TokenKind.PLUS, "+", 0, 1, 1)
     assert tokens[1] == Token(TokenKind.STAR, "*", 1, 1, 2)
@@ -54,8 +54,9 @@ def test_i_can_tokenize():
     assert tokens[45] == Token(TokenKind.BACK_QUOTE, '`', 108, 6, 50)
     assert tokens[46] == Token(TokenKind.EQUALSEQUALS, '==', 109, 6, 51)
     assert tokens[47] == Token(TokenKind.HASH, '#', 111, 6, 53)
+    assert tokens[48] == Token(TokenKind.VAR_DEF, '__var__10', 112, 6, 54)
 
-    assert tokens[48] == Token(TokenKind.EOF, '', 112, 6, 54)
+    assert tokens[49] == Token(TokenKind.EOF, '', 121, 6, 63)
 
 
 @pytest.mark.parametrize("text, expected", [
@@ -88,6 +89,19 @@ def test_i_can_parse_word(text):
     assert tokens[1].index == len(text)
 
 
+@pytest.mark.parametrize("text", [
+    "__var__0",
+    "__var__1",
+    "__var__10",
+    "__var__999",
+])
+def test_i_can_parse_var_def(text):
+    tokens = list(Tokenizer(text))
+    assert len(tokens) == 2
+    assert tokens[0].type == TokenKind.VAR_DEF
+    assert tokens[0].value == text
+
+
 @pytest.mark.parametrize("text, message, error_text, index, line, column", [
     ("'string", "Missing Trailing quote", "'string", 7, 1, 8),
     ('"string', "Missing Trailing quote", '"string', 7, 1, 8),