96 lines
3.8 KiB
TypeScript
96 lines
3.8 KiB
TypeScript
import type { BytesLike } from "./index.js";
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/**
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* The stanard normalization forms.
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*/
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export type UnicodeNormalizationForm = "NFC" | "NFD" | "NFKC" | "NFKD";
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/**
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* When using the UTF-8 error API the following errors can be intercepted
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* and processed as the %%reason%% passed to the [[Utf8ErrorFunc]].
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*
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* **``"UNEXPECTED_CONTINUE"``** - a continuation byte was present where there
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* was nothing to continue.
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*
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* **``"BAD_PREFIX"``** - an invalid (non-continuation) byte to start a
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* UTF-8 codepoint was found.
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*
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* **``"OVERRUN"``** - the string is too short to process the expected
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* codepoint length.
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*
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* **``"MISSING_CONTINUE"``** - a missing continuation byte was expected but
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* not found. The %%offset%% indicates the index the continuation byte
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* was expected at.
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*
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* **``"OUT_OF_RANGE"``** - the computed code point is outside the range
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* for UTF-8. The %%badCodepoint%% indicates the computed codepoint, which was
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* outside the valid UTF-8 range.
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*
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* **``"UTF16_SURROGATE"``** - the UTF-8 strings contained a UTF-16 surrogate
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* pair. The %%badCodepoint%% is the computed codepoint, which was inside the
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* UTF-16 surrogate range.
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*
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* **``"OVERLONG"``** - the string is an overlong representation. The
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* %%badCodepoint%% indicates the computed codepoint, which has already
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* been bounds checked.
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*
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*
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* @returns string
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*/
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export type Utf8ErrorReason = "UNEXPECTED_CONTINUE" | "BAD_PREFIX" | "OVERRUN" | "MISSING_CONTINUE" | "OUT_OF_RANGE" | "UTF16_SURROGATE" | "OVERLONG";
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/**
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* A callback that can be used with [[toUtf8String]] to analysis or
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* recovery from invalid UTF-8 data.
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*
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* Parsing UTF-8 data is done through a simple Finite-State Machine (FSM)
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* which calls the ``Utf8ErrorFunc`` if a fault is detected.
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*
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* The %%reason%% indicates where in the FSM execution the fault
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* occurred and the %%offset%% indicates where the input failed.
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*
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* The %%bytes%% represents the raw UTF-8 data that was provided and
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* %%output%% is the current array of UTF-8 code-points, which may
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* be updated by the ``Utf8ErrorFunc``.
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*
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* The value of the %%badCodepoint%% depends on the %%reason%%. See
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* [[Utf8ErrorReason]] for details.
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*
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* The function should return the number of bytes that should be skipped
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* when control resumes to the FSM.
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*/
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export type Utf8ErrorFunc = (reason: Utf8ErrorReason, offset: number, bytes: Uint8Array, output: Array<number>, badCodepoint?: number) => number;
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/**
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* A handful of popular, built-in UTF-8 error handling strategies.
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*
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* **``"error"``** - throws on ANY illegal UTF-8 sequence or
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* non-canonical (overlong) codepoints (this is the default)
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*
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* **``"ignore"``** - silently drops any illegal UTF-8 sequence
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* and accepts non-canonical (overlong) codepoints
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*
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* **``"replace"``** - replace any illegal UTF-8 sequence with the
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* UTF-8 replacement character (i.e. ``"\\ufffd"``) and accepts
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* non-canonical (overlong) codepoints
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*
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* @returns: Record<"error" | "ignore" | "replace", Utf8ErrorFunc>
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*/
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export declare const Utf8ErrorFuncs: Readonly<Record<"error" | "ignore" | "replace", Utf8ErrorFunc>>;
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/**
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* Returns the UTF-8 byte representation of %%str%%.
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*
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* If %%form%% is specified, the string is normalized.
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*/
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export declare function toUtf8Bytes(str: string, form?: UnicodeNormalizationForm): Uint8Array;
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/**
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* Returns the string represented by the UTF-8 data %%bytes%%.
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*
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* When %%onError%% function is specified, it is called on UTF-8
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* errors allowing recovery using the [[Utf8ErrorFunc]] API.
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* (default: [error](Utf8ErrorFuncs))
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*/
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export declare function toUtf8String(bytes: BytesLike, onError?: Utf8ErrorFunc): string;
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/**
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* Returns the UTF-8 code-points for %%str%%.
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*
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* If %%form%% is specified, the string is normalized.
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*/
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export declare function toUtf8CodePoints(str: string, form?: UnicodeNormalizationForm): Array<number>;
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