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Eric Coissac
8c7017a99d
- Update obioptions.Version from "Release 4.4.29" to "/v/ Release v5" - Update version.txt from 4.29 → .30 (automated by Makefile)
23 lines
1.4 KiB
Markdown
23 lines
1.4 KiB
Markdown
## `ReadEmptyFile` Function — Semantic Description
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- **Package**: `obiformats`, part of the OBITools4 ecosystem for biological sequence handling.
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- **Purpose**: Creates and returns an *empty*, closed iterator over biosequences (`IBioSequence`).
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- **Signature**:
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`func ReadEmptyFile(options ...WithOption) (obiiter.IBioSequence, error)`
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- **Input**: Accepts variadic `WithOption` configuration functions (currently unused in this minimal implementation).
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- **Behavior**:
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- Instantiates a new `IBioSequence` iterator via `obiiter.MakeIBioSequence()`.
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- Immediately closes the stream using `.Close()` — indicating no data will be yielded.
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- **Output**:
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- Returns a *terminal* iterator (no elements), suitable as a safe default or fallback.
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- Error return is always `nil`, since no I/O occurs and the operation is deterministic.
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### Semantic Role & Use Cases
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- **Default/Placeholder**: Useful in conditional logic where a valid (but empty) sequence iterator is required when no input file exists or parsing fails.
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- **Consistency**: Ensures callers always receive a well-formed iterator, avoiding `nil` checks.
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- **Resource Safety**: The closed state prevents accidental iteration or memory leaks.
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### Design Notes
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- Reflects a *pure-functional* and *fail-safe* pattern: no side effects, deterministic behavior.
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- Aligns with iterator-based I/O design principles in OBITools4 (lazy, composable streams).
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