meco-core

meco-core is the pure-Rust engine for the Mongolian Encoding Converter. It converts among Zvvnmod, Delehi, MenkShape, MenkLetter, Z52, and canonical UTN #57 Unicode in both directions; conversions route through the Zvvnmod hub. Everything runs in process with no I/O, so the crate builds for wasm32-unknown-unknown as well as native targets. The minimum supported Rust version is 1.82.

Basic use

use meco_core::{translate, CodeType};

let input = "\u{E0E5}";
let output = translate(CodeType::MenkShape, CodeType::Zvvnmod, input)
    .expect("ZVVNMOD conversion should succeed");

Command line

The package also installs a meco binary without changing how Rust projects depend on the library:

cargo install meco-core --version 0.4.1 --locked
meco translate --from z52 --to menk_shape 'text'

Omit the final text argument to read UTF-8 from stdin. Output is written unchanged to stdout without an extra newline, so the command is safe in pipelines:

printf '%s' 'text' | meco translate --from z52 --to menk_shape

Run meco --help for the canonical encoding names and meco --version to verify the installed release.

UTN #57 output

Canonical UTN #57 Unicode output is part of the default build and uses the same API:

use meco_core::{translate, CodeType};

let input = "\u{E0E5}";
let output = translate(CodeType::MenkShape, CodeType::Utn57, input)
    .expect("UTN #57 conversion should succeed");
assert_eq!(output, "\u{180A}");

The conversion is performed in process by the pure-Rust zvvnmod-utn57 crate and its pinned mongol-norm normalizer. No Python, subprocess, installer, filesystem, or network access is involved, so the same code path runs on servers, desktops, mobile, and WebAssembly.

A failing conversion returns MecoError::Utn57(reason). Reverse conversion from UTN #57 remains unsupported and returns MecoError::Unsupported(CodeType::Utn57). Identity and blank-input conversions keep the normal short-circuit behavior.

The utn57-command feature from 0.2.x is kept as a deprecated no-op so existing --features utn57-command commands still build; it no longer changes anything.

The conversion path is:

source encoding
→ meco-core ZVVNMOD hub
→ zvvnmod-utn57 0.1.0 positioned written units
→ mongol-norm 0.1.1 (linked in)
→ canonical Unicode

For bindings, distribution, and the Java-oracle verification details, see the meco-rust repository.