python_decoder

test_files/components/README.md

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+https://component-model.bytecodealliance.org/

test_files/components/python_decoder/.gitignore

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+__pycache__

test_files/components/python_decoder/README.md

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+How to create and build the Python component:
+
+1. `pip install componentize-py`
+2. Create the `python_decoder` folder
+3. `cd python_decoder`
+4. Create `.gitignore` with content `__pycache__`
+5. Create the `src` folder with the file `app.py`
+6. Create the `wit` folder with the file `world.wit`
+7. Update code as needed
+8. `componentize-py --wit-path wit/world.wit bindings src/bindings`
+9. `componentize-py --wit-path wit/world.wit componentize src.app --output python_decoder.wasm`

test_files/components/python_decoder/src/app.py

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+from .bindings.component import exports
+from .bindings.component.imports import host
+
+name = "Python Test Decoder"
+
+class Decoder(exports.Decoder):
+    def init(self) -> None:
+        host.log(f"{name} initialized")
+
+    def name(self) -> str:
+        return name
+
+    def format_signal_value(self, value: str) -> str:
+        return str + "!"

test_files/components/python_decoder/src/bindings/component/__init__.py

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+from typing import TypeVar, Generic, Union, Optional, Protocol, Tuple, List, Any, Self
+from enum import Flag, Enum, auto
+from dataclasses import dataclass
+from abc import abstractmethod
+import weakref
+
+from .types import Result, Ok, Err, Some
+
+
+
+class Component(Protocol):
+    pass

test_files/components/python_decoder/src/bindings/component/exports/__init__.py

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+from typing import TypeVar, Generic, Union, Optional, Protocol, Tuple, List, Any, Self
+from enum import Flag, Enum, auto
+from dataclasses import dataclass
+from abc import abstractmethod
+import weakref
+
+from ..types import Result, Ok, Err, Some
+
+
+class Decoder(Protocol):
+
+    @abstractmethod
+    def init(self) -> None:
+        raise NotImplementedError
+
+    @abstractmethod
+    def name(self) -> str:
+        raise NotImplementedError
+
+    @abstractmethod
+    def format_signal_value(self, value: str) -> str:
+        raise NotImplementedError
+
+

test_files/components/python_decoder/src/bindings/component/exports/decoder.py

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+from typing import TypeVar, Generic, Union, Optional, Protocol, Tuple, List, Any, Self
+from enum import Flag, Enum, auto
+from dataclasses import dataclass
+from abc import abstractmethod
+import weakref
+
+from ..types import Result, Ok, Err, Some
+
+

test_files/components/python_decoder/src/bindings/component/imports/host.py

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+from typing import TypeVar, Generic, Union, Optional, Protocol, Tuple, List, Any, Self
+from enum import Flag, Enum, auto
+from dataclasses import dataclass
+from abc import abstractmethod
+import weakref
+
+from ..types import Result, Ok, Err, Some
+
+
+
+def log(message: str) -> None:
+    raise NotImplementedError
+

test_files/components/python_decoder/src/bindings/component/types.py

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+from typing import TypeVar, Generic, Union, Optional, Protocol, Tuple, List, Any, Self
+from enum import Flag, Enum, auto
+from dataclasses import dataclass
+from abc import abstractmethod
+import weakref
+
+
+S = TypeVar('S')
+@dataclass
+class Some(Generic[S]):
+    value: S
+
+T = TypeVar('T')
+@dataclass
+class Ok(Generic[T]):
+    value: T
+
+E = TypeVar('E')
+@dataclass(frozen=True)
+class Err(Generic[E], Exception):
+    value: E
+
+Result = Union[Ok[T], Err[E]]

test_files/components/python_decoder/wit/world.wit

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+package component:python-decoder;
+
+interface host {
+    log: func(message: string);
+}
+
+interface decoder {
+    init: func();
+    name: func() -> string;
+    format-signal-value: func(value: string) -> string;
+}
+
+world component {
+    import host;
+    export decoder;
+}