entities/dist/internal/decode-shared.d.ts

Encode & decode XML and HTML entities with ease & speed

/**
 * Decode a dictionary-encoded trie string back into its Uint16Array.
 *
 * Stream layout (consumed in this order):
 *   1. dict1 atoms — `dict1AtomCount` uint16 values, delta+RLE encoded.
 *   2. dict2 atoms — `atomCount - dict1AtomCount` values, delta+RLE.
 *   3. dict2 ngrams — `ngramCount - (dictSize - dict1AtomCount)` entries,
 *      each a pair of slot codes that resolve to earlier slots.
 *   4. dict1 ngrams — `dictSize - dict1AtomCount` entries, same shape.
 *   5. data — slot codes, each expanding to one or more uint16 values.
 *
 * Codes use a 91-char base (printable ASCII minus `"`, `$`, `\`):
 *   - char1 < dictSize  → 1-char code, slot = char1
 *   - char1 ≥ dictSize  → 2-char code, slot = dictSize + (char1 - dictSize)*91 + char2
 *
 * Slot index → token kind:
 *   [0, A)                  dict1 atoms     (1-char codes)
 *   [A, dictSize)           dict1 ngrams    (1-char codes)
 *   [dictSize, dictSize+D)  dict2 atoms     (2-char codes)
 *   [dictSize+D, end)       dict2 ngrams    (2-char codes)
 *
 * Both atom dicts decode before any ngram, and dict2 ngrams decode before
 * dict1 ngrams. So every ngram entry references slots whose contents are
 * already filled — no forward references to handle.
 *
 * This runs on library import. Flat typed arrays store each slot as either
 * a plain value (`single`, covering every atom) or a range in a shared
 * `pool` (ngrams).
 * @param input Packed trie string.
 * @param resultLength Expected number of uint16 values in the output.
 * @param atomCount Total number of distinct uint16 values in the trie.
 * @param dict1AtomCount Atoms in the 1-char range (`A` above).
 * @param ngramCount Total number of ngram entries (dict1 + dict2).
 * @param dictSize Number of 1-char code slots; the rest of `BASE - dictSize`
 *   first-byte values are 2-char codes.
 */
export declare function decodeTrieDict(input: string, resultLength: number, atomCount: number, dict1AtomCount: number, ngramCount: number, dictSize: number): Uint16Array;
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