Fixed Syntax validation and autocompletion. Fixed unit tests

tests/core/formula/test_formula_engine.py

@@ -4,7 +4,8 @@ Tests for the FormulaEngine facade.
 import numpy as np
 import pytest
 
-from myfasthtml.core.formula.dsl.exceptions import FormulaSyntaxError, FormulaCycleError
+from myfasthtml.core.dsl.exceptions import DSLSyntaxError
+from myfasthtml.core.formula.dsl.exceptions import FormulaCycleError
 from myfasthtml.core.formula.engine import FormulaEngine
 
 
@@ -72,9 +73,9 @@ class TestSetFormula:
     assert totals[2] == 50
   
   def test_i_cannot_set_invalid_formula(self):
-    """Test that invalid formula syntax raises FormulaSyntaxError."""
+    """Test that invalid formula syntax raises DSLSyntaxError."""
     engine = make_engine()
-    with pytest.raises(FormulaSyntaxError):
+    with pytest.raises(DSLSyntaxError):
       engine.set_formula("t", "col", "{Price} * * {Qty}")
   
   def test_i_cannot_set_formula_with_cycle(self):

tests/core/formula/test_formula_parser.py

@@ -11,7 +11,7 @@ from myfasthtml.core.formula.dataclasses import (
   LiteralNode,
   FormulaDefinition,
 )
-from myfasthtml.core.formula.dsl.exceptions import FormulaSyntaxError
+from myfasthtml.core.dsl.exceptions import DSLSyntaxError
 from myfasthtml.core.formula.engine import parse_formula
 
 
@@ -177,12 +177,12 @@ def test_i_can_parse_nested_functions():
     "123 + + 456",  # double operator
 ])
 def test_i_cannot_parse_invalid_syntax(formula_text):
-  """Test that invalid syntax raises FormulaSyntaxError."""
-  with pytest.raises(FormulaSyntaxError):
+  """Test that invalid syntax raises DSLSyntaxError."""
+  with pytest.raises(DSLSyntaxError):
     parse_formula(formula_text)
 
 
 def test_i_cannot_parse_unclosed_brace():
-  """Test that an unclosed brace raises FormulaSyntaxError."""
-  with pytest.raises(FormulaSyntaxError):
+  """Test that an unclosed brace raises DSLSyntaxError."""
+  with pytest.raises(DSLSyntaxError):
     parse_formula("{Price")

tests/core/test_datagrid_registry.py

@@ -30,7 +30,9 @@ def session():
 
 @pytest.fixture
 def parent(session):
-  return SingleInstance(session=session, _id="test_parent_id")
+  instance = SingleInstance(session=session, _id="test_parent_id")
+  instance.get_formula_engine = lambda: None
+  return instance
 
 
 @pytest.fixture