forked from mirrors/firefish
72 lines
1.7 KiB
Rust
72 lines
1.7 KiB
Rust
use napi::{bindgen_prelude::*, Error, Status};
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use napi_derive::napi;
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static CHAR_COLLECTION: &str = "0123456789abcdefghijklmnopqrstuvwxyz";
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// -- NAPI exports --
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#[napi]
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pub enum IdConvertType {
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MastodonId,
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FirefishId,
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}
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#[napi]
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pub fn convert_id(in_id: String, id_convert_type: IdConvertType) -> napi::Result<String> {
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println!("converting id: {}", in_id);
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use IdConvertType::*;
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match id_convert_type {
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MastodonId => {
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let mut out: i128 = 0;
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for (i, c) in in_id.to_lowercase().chars().rev().enumerate() {
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out += num_from_char(c)? as i128 * 36_i128.pow(i as u32);
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}
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Ok(out.to_string())
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}
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FirefishId => {
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let mut input: i128 = match in_id.parse() {
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Ok(s) => s,
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Err(_) => {
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return Err(Error::new(
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Status::InvalidArg,
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"Unable to parse ID as MastodonId",
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))
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}
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};
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let mut out = String::new();
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while input != 0 {
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out.insert(0, char_from_num((input % 36) as u8)?);
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input /= 36;
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}
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Ok(out)
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}
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}
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}
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// -- end --
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#[inline(always)]
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fn num_from_char(character: char) -> napi::Result<u8> {
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for (i, c) in CHAR_COLLECTION.chars().enumerate() {
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if c == character {
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return Ok(i as u8);
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}
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}
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Err(Error::new(
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Status::InvalidArg,
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"Invalid character in parsed base36 id",
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))
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}
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#[inline(always)]
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fn char_from_num(number: u8) -> napi::Result<char> {
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CHAR_COLLECTION
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.chars()
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.nth(number as usize)
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.ok_or(Error::from_status(Status::Unknown))
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}
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