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132 lines (123 loc) · 4.58 KB
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# Copyright 2025 Google LLC
#
# 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.
"""A sample CEL extension implemented entirely in Python."""
from typing import Any
from cel_expr_python import cel
class SampleCelExtension(cel.CelExtension):
"""A sample class for a CEL extension."""
def __init__(self):
super().__init__(
"sample_cel_extension",
functions=[
cel.FunctionDecl(
"translate",
[
cel.Overload(
"translate_inst",
return_type=cel.Type.STRING,
parameters=[
cel.Type.STRING,
cel.Type.STRING,
cel.Type.STRING,
],
is_member=True,
impl=self.translate,
)
],
),
cel.FunctionDecl(
"translate_late",
[
cel.Overload(
"late_bound_translation",
return_type=cel.Type.STRING,
parameters=[cel.Type.STRING],
is_member=False,
# Note: no impl provided here.
)
],
),
# Tests for type adaptation.
cel.FunctionDecl(
"lerp",
[
cel.Overload(
"lerp_int_int_double",
return_type=cel.Type.DOUBLE,
parameters=[
cel.Type.INT,
cel.Type.INT,
cel.Type.DOUBLE,
],
is_member=False,
impl=self.lerp,
),
cel.Overload(
"lerp_uint_uint_double",
return_type=cel.Type.DOUBLE,
parameters=[
cel.Type.UINT,
cel.Type.UINT,
cel.Type.DOUBLE,
],
is_member=False,
impl=self.lerp,
),
],
),
cel.FunctionDecl(
"getOrDefault",
[
cel.Overload(
"map_get_or_default_string_dyn",
return_type=cel.Type.DYN,
parameters=[
cel.Type.Map(cel.Type.STRING, cel.Type.DYN),
cel.Type.STRING,
cel.Type.DYN,
],
is_member=True,
impl=self.map_get_or_default,
),
cel.Overload(
"get_or_default_map_string_dyn",
return_type=cel.Type.DYN,
parameters=[
cel.Type.Map(cel.Type.STRING, cel.Type.DYN),
cel.Type.STRING,
cel.Type.DYN,
],
is_member=False,
impl=self.map_get_or_default,
),
],
),
],
)
def translate(self, text: str, from_lang: str, to_lang: str) -> str:
if from_lang != "en" or to_lang != "es":
raise ValueError("We can only translate from 'en' to 'es'")
if text != "Hello, world!":
raise ValueError("Come on, this is just 'Hello, world!'")
return "¡Hola Mundo!"
def lerp(self, a: int, b: int, t: float) -> float:
"""Linearly interpolate between a and b using t."""
if t < 0.0 or t > 1.0:
raise ValueError("t must be between 0.0 and 1.0")
return a + (b - a) * t
def map_get_or_default(
self, m: dict[str, Any], key: str, default: Any
) -> Any:
"""Get the value for the key from the map, or return the default value."""
return m.get(key, default)