Crate skey_engine 

skey-engine — Stateless Vietnamese input method engine.

Letter-based accumulator model for Vietnamese input. Key features:

• Stateless: input string → output string
• Letter struct with variant + tone tracking
• Modifier keys mutate the last vowel in place
• Precomputed UTF-8 tables for output
• Correct tone placement for all diphthong/triphthong cases

Modules

charset

Vietnamese charset conversion.

engine

Vietnamese IME engine — Letter-based accumulator model. Each keystroke produces a Letter struct. Modifier keys (w, tone, z) mutate the last matching vowel in place. UTF-8 output via precomputed tables.

spelling

Vietnamese CVC (Consonant-Vowel-Consonant) spelling validation.

tables

Precomposed UTF-8 Vietnamese character lookup tables. tone 0=none, 1=grave, 2=acute, 3=hook, 4=tilde, 5=dot

vseq

Vowel sequence table — models Vietnamese vowel clusters for hook/breve transformations (inspired by fcitx5-unikey’s VSeqList).

Structs

SkeyEngine

Opaque engine handle — holds only configuration.

Enums

Method

Input method.

Functions

skey_charset_decode^⚠

skey_charset_encode^⚠

skey_charset_free_buf^⚠

skey_charset_remove_tone^⚠

skey_engine_add_word^⚠

skey_engine_clear_words^⚠

skey_engine_dict_words^⚠

All embedded dictionary words joined by ‘\n’ (sorted). Caller frees with skey_free_string().

skey_engine_free^⚠

skey_engine_is_valid^⚠

skey_engine_new^⚠

skey_engine_set_auto_restore^⚠

skey_engine_set_bracket_uo^⚠

skey_engine_set_dict^⚠

skey_engine_set_free_marking^⚠

skey_engine_set_method^⚠

skey_engine_set_short_w^⚠

skey_engine_set_tone_style^⚠

tone_style: 0=traditional (hoà, thuỷ), 1=modern (hòa, thủy). Default modern.

skey_engine_transform^⚠

skey_free_string^⚠