cel-python/cel_expr_python/cel_env_test.py at main · cel-expr/cel-python · GitHub

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# Licensed under the Apache License, Version 2.0 (the "License");

# you may not use this file except in compliance with the License.

# You may obtain a copy of the License at

# https://www.apache.org/licenses/LICENSE-2.0

# Unless required by applicable law or agreed to in writing, software

# distributed under the License is distributed on an "AS IS" BASIS,

# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

# See the License for the specific language governing permissions and

# limitations under the License.

"""Tests for Env/Config.

This module contains tests for the `cel.EnvConfig` class, focusing on its

ability to be created from and serialized to YAML format.

"""

import textwrap

from typing import Any

from absl.testing import absltest

from cel_expr_python import cel

from cel_expr_python.ext import ext_bindings

from cel_expr_python.ext import ext_math

from cel_expr_python.ext import ext_optional

from cel_expr_python.ext import ext_strings

from cel.expr.conformance.proto2 import test_all_types_pb2 as test_all_types_pb

class CelEnvTest(absltest.TestCase):

def test_env_config_from_and_to_yaml(self):

config: cel.EnvConfig = cel.NewEnvConfigFromYaml("""

container: test.container

stdlib:

exclude_macros:

- map

- filter

exclude_functions:

- name: "_+_"

extensions:

- name: math

variables:

- name: one

type: int

value: 1

functions:

- name: add

overloads:

- signature: "add(int,int)"

return: int

""")

yaml: str = config.to_yaml()

self.assertEqual(

normalize_yaml(yaml),

normalize_yaml("""

container: "test.container"

extensions:

- name: "math"

stdlib:

exclude_macros:

- "filter"

- "map"

exclude_functions:

- name: "_+_"

variables:

- name: "one"

type: "int"

value: 1

functions:

- name: "add"

overloads:

- signature: "add(int,int)"

return: "int"

"""),

)

def test_invalid_yaml(self):

with self.assertRaises(Exception) as e:

cel.NewEnvConfigFromYaml(" invalid yaml")

self.assertIn(

"1:2: Invalid CEL environment config YAML\n"

+ "| invalid yaml\n"

+ "| ^",

str(e.exception),

)

def test_parse_context_variable_config(self):

config = cel.NewEnvConfigFromYaml("""

context_variable:

type_name: "cel.expr.conformance.proto2.TestAllTypes"

""")

self.assertEqual(

config.context_type, "cel.expr.conformance.proto2.TestAllTypes"

)

def test_parse_context_variable_config_alternative_syntax(self):

config = cel.NewEnvConfigFromYaml("""

context_variable:

type: "cel.expr.conformance.proto2.TestAllTypes"

""")

self.assertEqual(

config.context_type, "cel.expr.conformance.proto2.TestAllTypes"

)

def test_parse_context_variable_malformed(self):

with self.assertRaisesRegex(

Exception, "Node 'context_variable' is not a map"

cel.NewEnvConfigFromYaml("context_variable: 123")

def test_parse_context_variable_malformed2(self):

with self.assertRaisesRegex(

Exception, "Node 'context_variable' does not have a valid type"

cel.NewEnvConfigFromYaml("""

context_variable:

type:

foo: bar

""")

def test_context_variable_basic(self):

config = cel.NewEnvConfigFromYaml("""

context_variable:

type_name: "cel.expr.conformance.proto2.TestAllTypes"

""")

env = cel.NewEnv(config=config)

ast = env.compile("single_int32 > 10")

self.assertIsNotNone(ast)

with self.assertRaises(Exception):

env.compile("non_existent_field > 10")

def test_config_export_container(self):

env: cel.Env = cel.NewEnv(container="test.container")

yaml: str = env.config().to_yaml()

self.assertEqual(

normalize_yaml(yaml),

normalize_yaml("""

container: "test.container"

"""),

)

def test_expression_container_abbreviations_and_aliases(self):

expr_container = cel.ExpressionContainer(

"test.container", abbreviations=["x.y.foo"], aliases={"abc": "x.y.bar"}

)

env: cel.Env = cel.NewEnv(

container=expr_container,

variables={

"x.y.foo": cel.Type.INT,

"x.y.bar": cel.Type.STRING,

)

res = env.compile("foo").eval(data={"x.y.foo": 42})

self.assertEqual(res.value(), 42)

res = env.compile("abc").eval(data={"x.y.bar": "chocolate"})

self.assertEqual(res.value(), "chocolate")

yaml: str = env.config().to_yaml()

self.assertEqual(

normalize_yaml(yaml),

normalize_yaml("""

container:

abbreviations:

- "x.y.foo"

aliases:

- alias: "abc"

qualified_name: "x.y.bar"

variables:

- name: "x.y.bar"

type: "string"

- name: "x.y.foo"

type: "int"

"""),

)

def test_abbreviations_and_aliases_from_yaml(self):

env: cel.Env = cel.NewEnv(config=cel.NewEnvConfigFromYaml("""

container:

abbreviations:

- "x.y.foo"

aliases:

- alias: "abc"

qualified_name: "x.y.bar"

variables:

- name: "x.y.bar"

type: "string"

- name: "x.y.foo"

type: "int"

"""))

res = env.compile("foo").eval(data={"x.y.foo": 42})

self.assertEqual(res.value(), 42)

res = env.compile("abc").eval(data={"x.y.bar": "chocolate"})

self.assertEqual(res.value(), "chocolate")

def test_abbreviations_and_aliases_combined(self):

env: cel.Env = cel.NewEnv(

config=cel.NewEnvConfigFromYaml("""

container:

abbreviations:

- "x.y.foo"

aliases:

- alias: "abc"

qualified_name: "x.y.bar"

variables:

- name: "x.y.bar"

type: "string"

- name: "x.y.foo"

type: "int"

- name: "a.b.qux"

type: "string"

- name: "a.b.baz"

type: "int"

"""),

container=cel.ExpressionContainer(

"test.container",

abbreviations=["a.b.baz"],

aliases={"def": "a.b.qux"},

)

res = env.compile("foo").eval(data={"x.y.foo": 42})

self.assertEqual(res.value(), 42)

res = env.compile("baz").eval(data={"a.b.baz": 24})

self.assertEqual(res.value(), 24)

res = env.compile("abc").eval(data={"x.y.bar": "chocolate"})

self.assertEqual(res.value(), "chocolate")

res = env.compile("def").eval(data={"a.b.qux": "vanilla"})

self.assertEqual(res.value(), "vanilla")

yaml: str = env.config().to_yaml()

self.assertEqual(

normalize_yaml(yaml),

normalize_yaml("""

container:

abbreviations:

- "a.b.baz"

- "x.y.foo"

aliases:

- alias: "abc"

qualified_name: "x.y.bar"

- alias: "def"

qualified_name: "a.b.qux"

variables:

- name: "a.b.baz"

type: "int"

- name: "a.b.qux"

type: "string"

- name: "x.y.bar"

type: "string"

- name: "x.y.foo"

type: "int"

"""),

)

def test_alias_redefinition_error(self):

with self.assertRaises(Exception) as e:

cel.NewEnv(

container=cel.ExpressionContainer(

"test.container", aliases={"abc": "x.y.bar"}

config=cel.NewEnvConfigFromYaml("""

container:

aliases:

- alias: "abc"

qualified_name: "x.y.baz"

"""),

)

self.assertIn(

"Alias 'abc' is already defined with a different qualified name:"

" x.y.baz",

str(e.exception),

)

def test_config_export_variables(self):

config: cel.Env = cel.NewEnv(

variables={

"var_bool": cel.Type.BOOL,

"var_int": cel.Type.INT,

"var_uint": cel.Type.UINT,

"var_double": cel.Type.DOUBLE,

"var_str": cel.Type.STRING,

"var_bytes": cel.Type.BYTES,

"var_msg": cel.Type("cel.expr.conformance.proto2.TestAllTypes"),

"var_string_list": cel.Type.List(cel.Type.STRING),

"var_timestamp": cel.Type.TIMESTAMP,

"var_duration": cel.Type.DURATION,

"var_dyn_list": cel.Type.LIST,

"var_int_map": cel.Type.Map(cel.Type.INT, cel.Type.STRING),

"var_string_map": cel.Type.Map(cel.Type.STRING, cel.Type.BOOL),

"var_dyn_map": cel.Type.MAP,

"var_dyn": cel.Type.DYN,

}

)

yaml: str = config.config().to_yaml()

self.assertEqual(

normalize_yaml(yaml),

normalize_yaml("""

variables:

- name: "var_bool"

type: "bool"

- name: "var_bytes"

type: "bytes"

- name: "var_double"

type: "double"

- name: "var_duration"

type: "duration"

- name: "var_dyn"

type: "dyn"

- name: "var_dyn_list"

type: "list<dyn>"

- name: "var_dyn_map"

type: "map<dyn,dyn>"

- name: "var_int"

type: "int"

- name: "var_int_map"

type: "map<int,string>"

- name: "var_msg"

type: "cel.expr.conformance.proto2.TestAllTypes"

- name: "var_str"

type: "string"

- name: "var_string_list"

type: "list<string>"

- name: "var_string_map"

type: "map<string,bool>"

- name: "var_timestamp"

type: "timestamp"

- name: "var_uint"

type: "uint"

"""),

)

def test_config_augmented_variables(self):

config = cel.NewEnvConfigFromYaml("""

variables:

- name: "var_bool"

type: "bool"

""")

env: cel.Env = cel.NewEnv(

config=config,

variables={

"var_msg": cel.Type("cel.expr.conformance.proto2.TestAllTypes"),

)

yaml: str = env.config().to_yaml()

self.assertEqual(

normalize_yaml(yaml),

normalize_yaml("""

variables:

- name: "var_bool"

type: "bool"

- name: "var_msg"

type: "cel.expr.conformance.proto2.TestAllTypes"

"""),

)

def test_config_variable_override(self):

config: cel.EnvConfig = cel.NewEnvConfigFromYaml("""

variables:

- name: "var_bool"

type: "bool"

""")

with self.assertRaises(Exception) as e:

cel.NewEnv(

config=config,

variables={

"var_bool": cel.Type.INT,

)

self.assertIn(

"Variable 'var_bool' is already included",

str(e.exception),

)

def test_config_variable_types(self):

config: cel.EnvConfig = cel.NewEnvConfigFromYaml("""

variables:

- name: "var_bool"

type: "bool"

- name: "var_int"

type: "int"

value: 42

""")

env: cel.Env = cel.NewEnv(

config=config,

variables={

"var_msg": cel.Type("cel.expr.conformance.proto2.TestAllTypes"),

)

data: dict[str, Any] = {

"var_bool": True,

"var_msg": test_all_types_pb.TestAllTypes(single_string="hello"),

}

res: cel.Value = env.compile("var_bool").eval(data=data)

self.assertEqual(res.type(), cel.Type.BOOL)

self.assertTrue(res.value())

res = env.compile("var_msg.single_string").eval(data=data)

self.assertEqual(res.type(), cel.Type.STRING)

self.assertEqual(res.value(), "hello")

res = env.compile("var_int").eval(data=data)

self.assertEqual(res.type(), cel.Type.INT)

self.assertEqual(res.value(), 42)

def test_config_export_extension_version(self):

env: cel.Env = cel.NewEnv(

extensions=[

ext_math.ExtMath(0),

ext_optional.ExtOptional(1),

ext_strings.ExtStrings(2),

ext_bindings.ExtBindings(),

)

yaml: str = env.config().to_yaml()

self.assertEqual(

normalize_yaml(yaml),

normalize_yaml("""

extensions:

- name: "bindings"

- name: "math"

version: 0

- name: "optional"

version: 1

- name: "strings"

version: 2

"""),

)

def test_config_extension_version_out_of_range(self):

cases = [

[

lambda: ext_math.ExtMath(42),

r"'math' extension version: 42 not in range \[0, \d+\]",

[

lambda: ext_optional.ExtOptional(6),

r"'optional' extension version: 6 not in range \[0, \d+\]",

[

lambda: ext_strings.ExtStrings(18),

r"'strings' extension version: 18 not in range \[0, \d+\]",

]

for test_case in cases:

with self.assertRaises(Exception) as e:

cel.NewEnv(

extensions=[test_case[0]()], # pyrefly: ignore[not-callable]

)

self.assertRegex(str(e.exception), test_case[1]) # pyrefly: ignore[bad-argument-type]

def test_config_extensions(self):

config: cel.EnvConfig = cel.NewEnvConfigFromYaml("""

extensions:

- name: math

- name: strings

""")

env: cel.Env = cel.NewEnv(

config=config,

extensions=[TestCelExtension()],

)

yaml: str = env.config().to_yaml()

self.assertEqual(

normalize_yaml(yaml),

normalize_yaml("""

extensions:

- name: "math"

- name: "strings"

- name: "test_cel_extension"

"""),

)

res: cel.Value = env.compile("'%.4f'.format([math.sqrt(2)])").eval()

self.assertEqual(res.value(), "1.4142")

res = env.compile("hello('World')").eval()

self.assertEqual(res.value(), "Hello, World!")

def test_standard_extensions_via_config(self):

config: cel.EnvConfig = cel.NewEnvConfigFromYaml("""

extensions:

- name: lists

- name: sets

- name: two-var-comprehensions

- name: optional

- name: regex

""")

env: cel.Env = cel.NewEnv(config=config)

# Test lists extension (e.g., reverse)

res = env.compile("[1, 2].reverse()").eval()

self.assertEqual(res.plain_value(), [2, 1])

# Test sets extension (e.g., intersects)

res = env.compile("sets.intersects([1, 2], [2, 3])").eval()

self.assertEqual(res.value(), True)

# Test two-var-comprehensions (e.g., all)

res = env.compile("[1, 2].all(i, v, v > 0)").eval()

self.assertEqual(res.value(), True)

# Test regex extension (e.g., replace)

expr = r"regex.replace('123-456', r'(\d+)-(\d+)', r'\2-\1')"

res = env.compile(expr).eval()

self.assertEqual(res.value(), "456-123")

def test_config_extension_override_same_version(self):

config: cel.EnvConfig = cel.NewEnvConfigFromYaml("""

extensions:

- name: cel.lib.ext.math

version: 1

- name: strings

version: 2

""")

env: cel.Env = cel.NewEnv(

config=config,

extensions=[ext_math.ExtMath(1), ext_strings.ExtStrings(2)],

)

res = env.compile("'%.3f'.format([math.floor(3.14)])").eval()

self.assertEqual(res.value(), "3.000")

def test_config_extension_override_different_version(self):

config = cel.NewEnvConfigFromYaml("""

extensions:

- name: math

version: 0

- name: cel.lib.ext.strings

version: 2

""")

with self.assertRaises(Exception) as e:

cel.NewEnv(

config=config,

extensions=[ext_math.ExtMath()],

)

self.assertIn(

"Extension 'math' version 0 is already included. Cannot"

" also include version 2",

str(e.exception),

)

with self.assertRaises(Exception) as e:

cel.NewEnv(

config=config,

extensions=[ext_strings.ExtStrings(1)],

)

self.assertIn(

"Extension 'cel.lib.ext.strings' version 2 is already included. Cannot"

" also include version 1",

str(e.exception),

)

def test_config_functions(self):

config: cel.EnvConfig = cel.NewEnvConfigFromYaml("""

functions:

- name: is_ok

overloads:

- signature: "string.is_ok()"

return: "bool"

""")

env: cel.Env = cel.NewEnv(

config=config,

functions=[

cel.FunctionDecl(

"hello",

[

cel.Overload(

signature="hello(string,string)",

return_type=cel.Type.STRING,

impl=lambda ampm, arg: (

"Good"

f" {'morning' if ampm == 'am' else 'afternoon'},"

f" {arg}!"

)

function_impls={

"string.is_ok()": lambda arg: arg in ["excellent", "good", "fair"],

)

yaml = env.config().to_yaml()

self.assertEqual(

normalize_yaml(yaml),

normalize_yaml("""

functions:

- name: "hello"

overloads:

- signature: "hello(string,string)"

return: "string"

- name: "is_ok"

overloads:

- signature: "string.is_ok()"

return: "bool"

"""),

)

res: cel.Value = env.compile("hello('am', 'Sunshine')").eval()

self.assertEqual(res.value(), "Good morning, Sunshine!")

res = env.compile("hello('pm', 'tea is served')").eval()

self.assertEqual(res.value(), "Good afternoon, tea is served!")

res = env.compile("'good'.is_ok()").eval()

self.assertTrue(res.value())

res = env.compile("'bad'.is_ok()").eval()

self.assertFalse(res.value())

def test_config_function_override(self):

config: cel.EnvConfig = cel.NewEnvConfigFromYaml("""

functions:

- name: foo

overloads:

- signature: "foo()"

""")

with self.assertRaises(Exception) as e:

cel.NewEnv(

config=config,

functions=[

cel.FunctionDecl(

"foo",

[

cel.Overload(

signature="foo()",

impl=lambda: "hello",

)

function_impls={

"foo()": lambda: "goodbye",

)

self.assertIn(

"An implementation for function overload 'foo()' already exists.",

str(e.exception),

)

def test_overload_signature_errors(self):

with self.assertRaises(ValueError) as e2:

cel.Overload(signature="greet(string)", parameters=[cel.Type.STRING])

self.assertIn(

"If 'signature' is specified, 'parameters' should not be specified",

str(e2.exception),

)

with self.assertRaises(ValueError) as e3:

cel.Overload()

self.assertIn(

"Either 'id' or 'signature' must be specified", str(e3.exception)

)

def test_config_functions_deprecated_syntax(self):

"""Test that the deprecated function syntax is still supported."""

config: cel.EnvConfig = cel.NewEnvConfigFromYaml("""

functions:

- name: is_ok

overloads:

- id: "is_ok_string"

target:

type_name: string

return:

type_name: bool

""")

env: cel.Env = cel.NewEnv(

config=config,

functions=[

cel.FunctionDecl(

"hello",

[

cel.Overload(

"good_time_of_day",

return_type=cel.Type.STRING,

parameters=[

cel.Type.STRING,

impl=lambda ampm, arg: (

"Good"

f" {'morning' if ampm == 'am' else 'afternoon'},"

f" {arg}!"

)

function_impls={

"is_ok_string": lambda arg: arg in ["excellent", "good", "fair"],

)

yaml = env.config().to_yaml()

self.assertEqual(

normalize_yaml(yaml),

normalize_yaml("""

functions:

- name: "hello"

overloads:

- id: "good_time_of_day"

signature: "hello(string,string)"

return: "string"

- name: "is_ok"

overloads:

- id: "is_ok_string"

signature: "string.is_ok()"

return: "bool"

"""),

)

res: cel.Value = env.compile("hello('am', 'Sunshine')").eval()

self.assertEqual(res.value(), "Good morning, Sunshine!")

res = env.compile("hello('pm', 'tea is served')").eval()

self.assertEqual(res.value(), "Good afternoon, tea is served!")

res = env.compile("'good'.is_ok()").eval()

self.assertTrue(res.value())

res = env.compile("'bad'.is_ok()").eval()

self.assertFalse(res.value())

def test_env_options(self):

options = cel.Options(enable_pratt_parser=True)

self.assertTrue(options.enable_pratt_parser)

self.assertEqual(repr(options), "Options(enable_pratt_parser=True)")

options.enable_pratt_parser = False

self.assertFalse(options.enable_pratt_parser)

self.assertEqual(repr(options), "Options(enable_pratt_parser=False)")

env = cel.NewEnv(options=cel.Options(enable_pratt_parser=True))

self.assertTrue(env.options().enable_pratt_parser)

default_env = cel.NewEnv()

self.assertFalse(default_env.options().enable_pratt_parser)

class TestCelExtension(cel.CelExtension):

"""An example CEL extension for testing."""

def __init__(self):

super().__init__(

"test_cel_extension",

functions=[

cel.FunctionDecl(

"hello",

[

cel.Overload(

"hello(string)",

return_type=cel.Type.STRING,

parameters=[

cel.Type.STRING,

impl=lambda arg: f"Hello, {arg}!",

)

def normalize_yaml(yaml: str) -> str:

return textwrap.dedent(yaml).strip()

if __name__ == "__main__":

absltest.main()

cel-python/cel_expr_python/cel_env_test.py at main · cel-expr/cel-python · GitHub

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