Fixed #18 : Parsing and evaluating Python

tests/evaluators/test_PythonEvaluator.py

@@ -0,0 +1,58 @@
+import pytest
+
+from base import BaseTest
+from conftest import NewOntology
+from core.BuiltinConcepts import BuiltinConcepts
+from core.error import ErrorContext
+from evaluators.PythonEvaluator import PythonEvaluator
+from evaluators.PythonParser import PythonParser
+from helpers import _rv, _rvf, define_new_concept, get_concepts, get_metadata
+from parsers.ParserInput import ParserInput
+
+
+def get_parser_input_from(sheerka, context, command):
+    pi = ParserInput(command)
+    pi.init()
+    parser_start = _rv(sheerka.newn(BuiltinConcepts.PARSER_INPUT, pi=pi))
+    ret = PythonParser().eval(context, None, parser_start)
+    return ret.new[0]
+
+
+class TestPythonEvaluator(BaseTest):
+    @pytest.fixture()
+    def evaluator(self, sheerka):
+        return sheerka.evaluators[PythonEvaluator.NAME]
+
+    def test_i_can_match(self, sheerka, context, evaluator):
+        ret_val = _rv(sheerka.newn(BuiltinConcepts.PYTHON_CODE))
+        assert evaluator.matches(context, ret_val).status is True
+
+        ret_val = _rv(sheerka.newn(BuiltinConcepts.UNKNOWN_CONCEPT))  # it responds to USER_INPUT only
+        assert evaluator.matches(context, ret_val).status is False
+
+        ret_val = _rvf(sheerka.newn(BuiltinConcepts.PYTHON_CODE))  # status should be true
+        assert evaluator.matches(context, ret_val).status is False
+
+    @pytest.mark.parametrize("text, expected", [
+        ("1 + 1", 2),
+        ("echo('I have access to Sheerka !')", "I have access to Sheerka !"),
+        ("sheerka.echo('I have access to Sheerka !')", "I have access to Sheerka !"),
+        ("a=10\na", 10),
+    ])
+    def test_i_can_evaluate_simple_expression(self, sheerka, context, evaluator, text, expected):
+        start = get_parser_input_from(sheerka, context, text)
+        ret = evaluator.eval(context, None, start)
+        assert ret.eaten == [start]
+        assert len(ret.new) == 1
+        assert ret.new[0].status is True
+        assert ret.new[0].value == expected
+        assert ret.new[0].parents == [start]
+
+    def test_i_can_detect_evaluation_error(self, sheerka, context, evaluator):
+        start = get_parser_input_from(sheerka, context, "a")
+        ret = evaluator.eval(context, None, start)
+        assert ret.eaten == []
+        assert len(ret.new) == 1
+        assert ret.new[0].status is False
+        assert isinstance(ret.new[0].value, ErrorContext)
+        assert ret.new[0].parents == [start]