update dependencies and resolver

Previously, the bytes displayed for invalid characters included bytes
from the byte stream that were peeked rather than consumed. This
resulted in certain bytes being displayed multiple times, since the
peeked byte could appear in the following character.

For example, `printf '\xce\x61' | utfdump_bin` would result in the byte
0xce being displayed twice, once at the end of the invalid character and
once as the valid character `a`.

This patch modifies `utfdump::utf8::Utf8Error` so it also stores the
number of consumed bad bytes, enabling the binary to output only the
consumed bad bytes.

.gitignore

@@ -1,5 +1,4 @@
 /target
-/build
-/build.sh
+pkg/
 __pycache__
 unicode_data_latest.txt

Cargo.lock

@@ -3,10 +3,10 @@
 version = 3
 
 [[package]]
-name = "adler"
-version = "1.0.2"
+name = "adler2"
+version = "2.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f26201604c87b1e01bd3d98f8d5d9a8fcbb815e8cedb41ffccbeb4bf593a35fe"
+checksum = "512761e0bb2578dd7380c6baaa0f4ce03e84f95e960231d1dec8bf4d7d6e2627"
 
 [[package]]
 name = "atty"
@@ -21,9 +21,9 @@ dependencies = [
 
 [[package]]
 name = "autocfg"
-version = "1.1.0"
+version = "1.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "d468802bab17cbc0cc575e9b053f41e72aa36bfa6b7f55e3529ffa43161b97fa"
+checksum = "ace50bade8e6234aa140d9a2f552bbee1db4d353f69b8217bc503490fc1a9f26"
 
 [[package]]
 name = "bitflags"
@@ -32,10 +32,16 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "bef38d45163c2f1dde094a7dfd33ccf595c92905c8f8f4fdc18d06fb1037718a"
 
 [[package]]
-name = "bytecount"
-version = "0.6.3"
+name = "bumpalo"
+version = "3.16.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2c676a478f63e9fa2dd5368a42f28bba0d6c560b775f38583c8bbaa7fcd67c9c"
+checksum = "79296716171880943b8470b5f8d03aa55eb2e645a4874bdbb28adb49162e012c"
+
+[[package]]
+name = "bytecount"
+version = "0.6.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5ce89b21cab1437276d2650d57e971f9d548a2d9037cc231abdc0562b97498ce"
 
 [[package]]
 name = "cfg-if"
@@ -70,7 +76,7 @@ dependencies = [
  "proc-macro-error",
  "proc-macro2",
  "quote",
- "syn",
+ "syn 1.0.109",
 ]
 
 [[package]]
@@ -84,18 +90,18 @@ dependencies = [
 
 [[package]]
 name = "crc32fast"
-version = "1.3.2"
+version = "1.4.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b540bd8bc810d3885c6ea91e2018302f68baba2129ab3e88f32389ee9370880d"
+checksum = "a97769d94ddab943e4510d138150169a2758b5ef3eb191a9ee688de3e23ef7b3"
 dependencies = [
  "cfg-if",
 ]
 
 [[package]]
 name = "flate2"
-version = "1.0.26"
+version = "1.0.34"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "3b9429470923de8e8cbd4d2dc513535400b4b3fef0319fb5c4e1f520a7bef743"
+checksum = "a1b589b4dc103969ad3cf85c950899926ec64300a1a46d76c03a6072957036f0"
 dependencies = [
  "crc32fast",
  "miniz_oxide",
@@ -140,38 +146,44 @@ dependencies = [
 
 [[package]]
 name = "libc"
-version = "0.2.144"
+version = "0.2.161"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2b00cc1c228a6782d0f076e7b232802e0c5689d41bb5df366f2a6b6621cfdfe1"
+checksum = "8e9489c2807c139ffd9c1794f4af0ebe86a828db53ecdc7fea2111d0fed085d1"
 
 [[package]]
 name = "libshire"
 version = "0.1.0"
-source = "git+https://github.com/pantonshire/libshire?branch=main#44e27e9d2387c092d66ddfd871932e85b135499f"
+source = "git+https://github.com/pantonshire/libshire?branch=main#7858cd68cff790f56af78b667acff5d2e6522da1"
 dependencies = [
  "serde",
 ]
 
 [[package]]
-name = "miniz_oxide"
-version = "0.7.1"
+name = "log"
+version = "0.4.22"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e7810e0be55b428ada41041c41f32c9f1a42817901b4ccf45fa3d4b6561e74c7"
+checksum = "a7a70ba024b9dc04c27ea2f0c0548feb474ec5c54bba33a7f72f873a39d07b24"
+
+[[package]]
+name = "miniz_oxide"
+version = "0.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e2d80299ef12ff69b16a84bb182e3b9df68b5a91574d3d4fa6e41b65deec4df1"
 dependencies = [
- "adler",
+ "adler2",
 ]
 
 [[package]]
 name = "once_cell"
-version = "1.17.2"
+version = "1.20.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9670a07f94779e00908f3e686eab508878ebb390ba6e604d3a284c00e8d0487b"
+checksum = "1261fe7e33c73b354eab43b1273a57c8f967d0391e80353e51f764ac02cf6775"
 
 [[package]]
 name = "os_str_bytes"
-version = "6.5.0"
+version = "6.6.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ceedf44fb00f2d1984b0bc98102627ce622e083e49a5bacdb3e514fa4238e267"
+checksum = "e2355d85b9a3786f481747ced0e0ff2ba35213a1f9bd406ed906554d7af805a1"
 
 [[package]]
 name = "papergrid"
@@ -193,7 +205,7 @@ dependencies = [
  "proc-macro-error-attr",
  "proc-macro2",
  "quote",
- "syn",
+ "syn 1.0.109",
  "version_check",
 ]
 
@@ -210,27 +222,41 @@ dependencies = [
 
 [[package]]
 name = "proc-macro2"
-version = "1.0.59"
+version = "1.0.88"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6aeca18b86b413c660b781aa319e4e2648a3e6f9eadc9b47e9038e6fe9f3451b"
+checksum = "7c3a7fc5db1e57d5a779a352c8cdb57b29aa4c40cc69c3a68a7fedc815fbf2f9"
 dependencies = [
  "unicode-ident",
 ]
 
 [[package]]
 name = "quote"
-version = "1.0.28"
+version = "1.0.37"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1b9ab9c7eadfd8df19006f1cf1a4aed13540ed5cbc047010ece5826e10825488"
+checksum = "b5b9d34b8991d19d98081b46eacdd8eb58c6f2b201139f7c5f643cc155a633af"
 dependencies = [
  "proc-macro2",
 ]
 
 [[package]]
 name = "serde"
-version = "1.0.163"
+version = "1.0.211"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "2113ab51b87a539ae008b5c6c02dc020ffa39afd2d83cffcb3f4eb2722cebec2"
+checksum = "1ac55e59090389fb9f0dd9e0f3c09615afed1d19094284d0b200441f13550793"
+dependencies = [
+ "serde_derive",
+]
+
+[[package]]
+name = "serde_derive"
+version = "1.0.211"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "54be4f245ce16bc58d57ef2716271d0d4519e0f6defa147f6e081005bcb278ff"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.82",
+]
 
 [[package]]
 name = "strsim"
@@ -249,6 +275,17 @@ dependencies = [
  "unicode-ident",
 ]
 
+[[package]]
+name = "syn"
+version = "2.0.82"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "83540f837a8afc019423a8edb95b52a8effe46957ee402287f4292fae35be021"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "unicode-ident",
+]
+
 [[package]]
 name = "tabled"
 version = "0.8.0"
@@ -270,7 +307,7 @@ dependencies = [
  "proc-macro-error",
  "proc-macro2",
  "quote",
- "syn",
+ "syn 1.0.109",
 ]
 
 [[package]]
@@ -281,34 +318,34 @@ checksum = "55937e1799185b12863d447f42597ed69d9928686b8d88a1df17376a097d8369"
 
 [[package]]
 name = "termcolor"
-version = "1.2.0"
+version = "1.4.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "be55cf8942feac5c765c2c993422806843c9a9a45d4d5c407ad6dd2ea95eb9b6"
+checksum = "06794f8f6c5c898b3275aebefa6b8a1cb24cd2c6c79397ab15774837a0bc5755"
 dependencies = [
  "winapi-util",
 ]
 
 [[package]]
 name = "textwrap"
-version = "0.16.0"
+version = "0.16.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "222a222a5bfe1bba4a77b45ec488a741b3cb8872e5e499451fd7d0129c9c7c3d"
+checksum = "23d434d3f8967a09480fb04132ebe0a3e088c173e6d0ee7897abbdf4eab0f8b9"
 
 [[package]]
 name = "unicode-ident"
-version = "1.0.9"
+version = "1.0.13"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "b15811caf2415fb889178633e7724bad2509101cde276048e013b9def5e51fa0"
+checksum = "e91b56cd4cadaeb79bbf1a5645f6b4f8dc5bde8834ad5894a8db35fda9efa1fe"
 
 [[package]]
 name = "unicode-width"
-version = "0.1.10"
+version = "0.1.14"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c0edd1e5b14653f783770bce4a4dabb4a5108a5370a5f5d8cfe8710c361f6c8b"
+checksum = "7dd6e30e90baa6f72411720665d41d89b9a3d039dc45b8faea1ddd07f617f6af"
 
 [[package]]
 name = "utfdump"
-version = "0.1.0"
+version = "0.2.0"
 dependencies = [
  "flate2",
  "tap",
@@ -316,7 +353,7 @@ dependencies = [
 
 [[package]]
 name = "utfdump_bin"
-version = "0.1.0"
+version = "0.2.0"
 dependencies = [
  "clap",
  "libshire",
@@ -325,14 +362,73 @@ dependencies = [
 ]
 
 [[package]]
-name = "utfdump_core"
+name = "utfdump_wasm"
 version = "0.1.0"
+dependencies = [
+ "utfdump",
+ "wasm-bindgen",
+]
 
 [[package]]
 name = "version_check"
-version = "0.9.4"
+version = "0.9.5"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "49874b5167b65d7193b8aba1567f5c7d93d001cafc34600cee003eda787e483f"
+checksum = "0b928f33d975fc6ad9f86c8f283853ad26bdd5b10b7f1542aa2fa15e2289105a"
+
+[[package]]
+name = "wasm-bindgen"
+version = "0.2.95"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "128d1e363af62632b8eb57219c8fd7877144af57558fb2ef0368d0087bddeb2e"
+dependencies = [
+ "cfg-if",
+ "once_cell",
+ "wasm-bindgen-macro",
+]
+
+[[package]]
+name = "wasm-bindgen-backend"
+version = "0.2.95"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cb6dd4d3ca0ddffd1dd1c9c04f94b868c37ff5fac97c30b97cff2d74fce3a358"
+dependencies = [
+ "bumpalo",
+ "log",
+ "once_cell",
+ "proc-macro2",
+ "quote",
+ "syn 2.0.82",
+ "wasm-bindgen-shared",
+]
+
+[[package]]
+name = "wasm-bindgen-macro"
+version = "0.2.95"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e79384be7f8f5a9dd5d7167216f022090cf1f9ec128e6e6a482a2cb5c5422c56"
+dependencies = [
+ "quote",
+ "wasm-bindgen-macro-support",
+]
+
+[[package]]
+name = "wasm-bindgen-macro-support"
+version = "0.2.95"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "26c6ab57572f7a24a4985830b120de1594465e5d500f24afe89e16b4e833ef68"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.82",
+ "wasm-bindgen-backend",
+ "wasm-bindgen-shared",
+]
+
+[[package]]
+name = "wasm-bindgen-shared"
+version = "0.2.95"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "65fc09f10666a9f147042251e0dda9c18f166ff7de300607007e96bdebc1068d"
 
 [[package]]
 name = "winapi"
@@ -352,11 +448,11 @@ checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
 
 [[package]]
 name = "winapi-util"
-version = "0.1.5"
+version = "0.1.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "70ec6ce85bb158151cae5e5c87f95a8e97d2c0c4b001223f33a334e3ce5de178"
+checksum = "cf221c93e13a30d793f7645a0e7762c55d169dbb0a49671918a2319d289b10bb"
 dependencies = [
- "winapi",
+ "windows-sys",
 ]
 
 [[package]]
@@ -364,3 +460,76 @@ name = "winapi-x86_64-pc-windows-gnu"
 version = "0.4.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
+
+[[package]]
+name = "windows-sys"
+version = "0.59.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1e38bc4d79ed67fd075bcc251a1c39b32a1776bbe92e5bef1f0bf1f8c531853b"
+dependencies = [
+ "windows-targets",
+]
+
+[[package]]
+name = "windows-targets"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "9b724f72796e036ab90c1021d4780d4d3d648aca59e491e6b98e725b84e99973"
+dependencies = [
+ "windows_aarch64_gnullvm",
+ "windows_aarch64_msvc",
+ "windows_i686_gnu",
+ "windows_i686_gnullvm",
+ "windows_i686_msvc",
+ "windows_x86_64_gnu",
+ "windows_x86_64_gnullvm",
+ "windows_x86_64_msvc",
+]
+
+[[package]]
+name = "windows_aarch64_gnullvm"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "32a4622180e7a0ec044bb555404c800bc9fd9ec262ec147edd5989ccd0c02cd3"
+
+[[package]]
+name = "windows_aarch64_msvc"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "09ec2a7bb152e2252b53fa7803150007879548bc709c039df7627cabbd05d469"
+
+[[package]]
+name = "windows_i686_gnu"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8e9b5ad5ab802e97eb8e295ac6720e509ee4c243f69d781394014ebfe8bbfa0b"
+
+[[package]]
+name = "windows_i686_gnullvm"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0eee52d38c090b3caa76c563b86c3a4bd71ef1a819287c19d586d7334ae8ed66"
+
+[[package]]
+name = "windows_i686_msvc"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "240948bc05c5e7c6dabba28bf89d89ffce3e303022809e73deaefe4f6ec56c66"
+
+[[package]]
+name = "windows_x86_64_gnu"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "147a5c80aabfbf0c7d901cb5895d1de30ef2907eb21fbbab29ca94c5b08b1a78"
+
+[[package]]
+name = "windows_x86_64_gnullvm"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "24d5b23dc417412679681396f2b49f3de8c1473deb516bd34410872eff51ed0d"
+
+[[package]]
+name = "windows_x86_64_msvc"
+version = "0.52.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "589f6da84c646204747d1270a2a5661ea66ed1cced2631d546fdfb155959f9ec"

Cargo.toml

@@ -2,4 +2,13 @@
 members = [
     "lib",
     "bin",
+    "wasm",
 ]
+resolver = "2"
+
+[profile.release]
+panic = "abort"
+lto = "fat"
+
+[profile.release.package.utfdump_wasm]
+opt-level = "z"

bin/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "utfdump_bin"
-version = "0.1.0"
+version = "0.2.0"
 edition = "2021"
 authors = ["Tom Panton <pantonshire@gmail.com>"]
 license = "MIT"

bin/src/main.rs

@@ -110,14 +110,14 @@ impl OutRow {
     }
 
     fn from_bad_char(err: Utf8Error) -> Self {
-        let (bad_bytes, num_bad_bytes) = err.into_parts();
+        let (bad_bytes, _num_bad_bytes, num_consumed_bad_bytes) = err.into_parts();
 
         Self {
             display_char: CappedString::new_truncating("\u{fffd}"),
             codepoint: Optional::None,
             utf_8_bytes: Utf8Bytes {
                 buf: bad_bytes,
-                len: num_bad_bytes,
+                len: num_consumed_bad_bytes,
             },
             name: Optional::Some("<invalid>"),
             category: Optional::None,

data.py

@@ -52,6 +52,12 @@ from enum import Enum
 from struct import pack
 from typing import Optional
 from gzip import compress
+from time import time
+import http.client
+
+unicode_data_host = 'www.unicode.org'
+unicode_data_url_path = '/Public/UCD/latest/ucd/UnicodeData.txt'
+out_data_path = 'lib/unicode_data_encoded.gz'
 
 class StringTableIndex:
     def __init__(self, bs: bytes):
@@ -247,19 +253,31 @@ def encode_char_data(
 
     return bytes(encoded)
 
-with open('unicode_data_latest.txt', 'r') as fd:
-    input_data = fd.read()
+print('Fetching Unicode data from {}...'.format(unicode_data_host))
+start_time = time()
+
+conn = http.client.HTTPConnection(unicode_data_host, timeout=30)
+conn.request('GET', unicode_data_url_path)
+resp = conn.getresponse()
+resp_data = resp.read()
+input_data = resp_data.decode('utf-8')
+
+end_time = time()
+print('Fetched Unicode data in {:.2f}s'.format(end_time - start_time))
 
 char_data_table = bytearray()
 string_table = StringTable()
-# FIXME: calculate cumulative offset required for codepoints after each group
 groups = []
 in_group = False
 prev_code = None
 
 uniq_vals = {}
 
-for row in input_data.splitlines():    
+rows = [row.strip() for row in input_data.splitlines() if len(row.strip()) > 0]
+
+print('Encoding {} rows...'.format(len(rows)))
+
+for row in rows:    
     is_group_start = False
 
     [
@@ -425,5 +443,9 @@ encoded_data.extend(string_table)
 
 compressed_data = compress(encoded_data)
 
-with open('unicode_data_encoded.gz', 'wb') as fd:
+print('Writing encoded data to {}...'.format(out_data_path))
+
+with open(out_data_path, 'wb') as fd:
     fd.write(compressed_data)
+
+print('Done!')

get_data.sh

@@ -1,2 +0,0 @@
-#!/bin/bash
-curl --proto '=https' --tlsv1.2 'https://www.unicode.org/Public/UCD/latest/ucd/UnicodeData.txt' > utfdump/unicode_data_latest.txt

lib/Cargo.toml

@@ -1,8 +1,11 @@
 [package]
 name = "utfdump"
-version = "0.1.0"
+version = "0.2.0"
 edition = "2021"
 
+[features]
+std = []
+
 [dependencies]
 tap = "1.0.1"
 

lib/build.rs

@@ -1,6 +1,6 @@
 use std::{env, fs::File, io, path::Path};
 
-const COMPRESSED_DATA_PATH: &str = "../unicode_data_encoded.gz";
+const COMPRESSED_DATA_PATH: &str = "unicode_data_encoded.gz";
 const OUT_DATA_PATH: &str = "unicode_data_encoded";
 
 fn main() -> io::Result<()> {

lib/src/lib.rs

@@ -1,3 +1,5 @@
+#![cfg_attr(not(feature = "std"), no_std)]
+
 pub mod character;
 pub mod unicode_data;
 pub mod utf8;

lib/src/utf8.rs

@@ -128,6 +128,7 @@ where
                 return Some(Err(Utf8Error {
                     bad_bytes: bytes_seen,
                     num_bad_bytes: 1,
+                    num_consumed_bad_bytes: 1,
                 }));
             },
         }
@@ -140,6 +141,7 @@ where
                 None => return Some(Err(Utf8Error {
                     bad_bytes: bytes_seen,
                     num_bad_bytes: usize::from(i) + 1,
+                    num_consumed_bad_bytes: usize::from(i),
                 })),
             };
 
@@ -149,6 +151,7 @@ where
                 return Some(Err(Utf8Error {
                     bad_bytes: bytes_seen,
                     num_bad_bytes: usize::from(i) + 2,
+                    num_consumed_bad_bytes: usize::from(i) + 1,
                 }));
             }
 
@@ -172,6 +175,7 @@ where
 pub struct Utf8Error {
     bad_bytes: [u8; 4],
     num_bad_bytes: usize,
+    num_consumed_bad_bytes: usize,
 }
 
 impl Utf8Error {
@@ -179,8 +183,9 @@ impl Utf8Error {
         &self.bad_bytes[..self.num_bad_bytes]
     }
 
-    pub fn into_parts(self) -> ([u8; 4], usize) {
-        (self.bad_bytes, self.num_bad_bytes)
+    // FIXME: return some type with u8 array + length
+    pub fn into_parts(self) -> ([u8; 4], usize, usize) {
+        (self.bad_bytes, self.num_bad_bytes, self.num_consumed_bad_bytes)
     }
 }
 
@@ -192,64 +197,49 @@ mod tests {
 
     #[test]
     fn test_utf8_decoder() {
-        assert_eq!(
-            &decode_collect_lossy(&[
+        assert_decodes_to(&[
             0x68, 0x65, 0x6c, 0x6c, 0x6f
-            ]),
-            "hello"
-        );
+        ], "hello");
     
-        assert_eq!(
-            &decode_collect_lossy(&[
+        assert_decodes_to(&[
             0xce, 0xba, 0xe1, 0xbd, 0xb9, 0xcf, 0x83, 0xce, 0xbc, 0xce, 0xb5
-            ]),
-            "κόσμε"
-        );
+        ], "κόσμε");
 
-        assert_eq!(
-            &decode_collect_lossy(&[
+        assert_decodes_to(&[
             0xf0, 0x9f, 0x8f, 0xb3, 0xef, 0xb8, 0x8f, 0xe2, 0x80, 0x8d, 0xe2, 0x9a, 0xa7, 0xef,
             0xb8, 0x8f
-            ]),
-            "\u{1f3f3}\u{fe0f}\u{200d}\u{26a7}\u{fe0f}"
-        );
+        ], "\u{1f3f3}\u{fe0f}\u{200d}\u{26a7}\u{fe0f}");
 
-        assert_eq!(
-            &decode_collect_lossy(&[
+        assert_decodes_to(&[
             0xce, 0x61
-            ]),
-            "\u{fffd}a"
-        );
+        ], "\u{fffd}a");
 
-        assert_eq!(
-            &decode_collect_lossy(&[
+        assert_decodes_to(&[
             0xce, 0xc2
-            ]),
-            "\u{fffd}\u{fffd}"
-        );
+        ], "\u{fffd}\u{fffd}");
 
-        assert_eq!(
-            &decode_collect_lossy(&[
+        assert_decodes_to(&[
             0x80
-            ]),
-            "\u{fffd}"
-        );
+        ], "\u{fffd}");
 
-        assert_eq!(
-            &decode_collect_lossy(&[
+        assert_decodes_to(&[
             0x80, 0x80
-            ]),
-            "\u{fffd}\u{fffd}"
-        );
+        ], "\u{fffd}\u{fffd}");
     }
 
-    fn decode_collect_lossy(bytes: &[u8]) -> String {
-        bytes
-            .decode_utf8()
-            .map(|res| match res {
-                Ok(c) => c,
-                Err(_) => REPLACEMENT_CHARACTER,
-            })
-            .collect()
+    fn assert_decodes_to(bytes: &[u8], expected: &str) {
+        let mut decoded = bytes.decode_utf8();
+
+        for expected_char in expected.chars() {
+            let decoded_char = match decoded.next() {
+                Some(Ok(c)) => Some(c),
+                Some(Err(_)) => Some(REPLACEMENT_CHARACTER),
+                None => None,
+            };
+
+            assert_eq!(decoded_char, Some(expected_char));
+        }
+
+        assert!(decoded.next().is_none());
     }
 }

wasm/Cargo.toml

@@ -0,0 +1,12 @@
+[package]
+name = "utfdump_wasm"
+version = "0.1.0"
+edition = "2021"
+rust-version = "1.70.0"
+
+[lib]
+crate-type = ["cdylib", "rlib"]
+
+[dependencies]
+utfdump = { path = "../lib" }
+wasm-bindgen = "0.2.86"

wasm/src/lib.rs

@@ -0,0 +1,133 @@
+use std::sync::OnceLock;
+
+use utfdump::{UnicodeData, CombiningClass, CharData};
+use wasm_bindgen::prelude::wasm_bindgen;
+
+#[wasm_bindgen]
+pub struct WbgCharData(CharData<'static>);
+
+#[wasm_bindgen]
+impl WbgCharData {
+    #[wasm_bindgen]
+    pub fn name(&self) -> String {
+        self.0.name().to_owned()
+    }
+
+    #[wasm_bindgen]
+    pub fn encoded_utf8(&self) -> Option<EncodedCodepoint> {
+        let c = char::try_from(self.0.codepoint()).ok()?;
+        let mut buf = [0u8; 4];
+        let len = c.encode_utf8(&mut buf).len() as u8;
+        Some(EncodedCodepoint::new(buf, len))
+    }
+
+    #[wasm_bindgen]
+    pub fn encoded_utf16_le(&self) -> Option<EncodedCodepoint> {
+        let (word_buf, num_words) = self.encoded_utf16()?;
+        let mut byte_buf = [0u8; 4];
+        for (i, word) in word_buf.iter().take(usize::from(num_words)).enumerate() {
+            let le_bytes = word.to_le_bytes();
+            byte_buf[(i * 2)..(i * 2 + 2)].copy_from_slice(&le_bytes);
+        }
+        Some(EncodedCodepoint::new(byte_buf, num_words * 2))
+    }
+
+    fn encoded_utf16(&self) -> Option<([u16; 2], u8)> {
+        let c = char::try_from(self.0.codepoint()).ok()?;
+        let mut word_buf = [0u16; 2];
+        let num_words = c.encode_utf16(&mut word_buf).len() as u8;
+        Some((word_buf, num_words))
+    }
+
+    #[wasm_bindgen]
+    pub fn category(&self) -> String {
+        self.0.category().abbreviation().to_owned()
+    }
+
+    #[wasm_bindgen]
+    pub fn category_full(&self) -> String {
+        self.0.category().full_name().to_owned()
+    }
+
+    #[wasm_bindgen]
+    pub fn combining_class(&self) -> u8 {
+        self.0.combining_class().0
+    }
+
+    #[wasm_bindgen]
+    pub fn bidi(&self) -> String {
+        self.0.bidi_category().abbreviation().to_owned()
+    }
+
+    #[wasm_bindgen]
+    pub fn bidi_full(&self) -> String {
+        self.0.bidi_category().full_name().to_owned()
+    }
+
+    #[wasm_bindgen]
+    pub fn numeric_value(&self) -> Option<String> {
+        self.0.numeric_value().map(ToOwned::to_owned)
+    }
+
+    #[wasm_bindgen]
+    pub fn mirrored(&self) -> bool {
+        self.0.mirrored()
+    }
+
+    #[wasm_bindgen]
+    pub fn decomp_string(&self) -> Option<String> {
+        self.0.decomp_mapping().map(|d| d.value().to_owned())
+    }
+
+    #[wasm_bindgen]
+    pub fn uppercase_string(&self) -> Option<String> {
+        self.0.uppercase().map(ToOwned::to_owned)
+    }
+
+    #[wasm_bindgen]
+    pub fn lowercase_string(&self) -> Option<String> {
+        self.0.lowercase().map(ToOwned::to_owned)
+    }
+
+    #[wasm_bindgen]
+    pub fn titlecase_string(&self) -> Option<String> {
+        self.0.titlecase().map(ToOwned::to_owned)
+    }
+}
+
+#[wasm_bindgen]
+pub fn combining_class_name(combining_class: u8) -> Option<String> {
+    CombiningClass(combining_class)
+        .name()
+        .map(ToOwned::to_owned)
+}
+
+static UNICODE_DATA: OnceLock<UnicodeData> = OnceLock::new();
+
+#[wasm_bindgen]
+pub fn codepoint_char_data(codepoint: u32) -> Option<WbgCharData> {
+    let unicode_data = UNICODE_DATA.get_or_init(|| {
+        UnicodeData::new()
+            .unwrap()
+    });
+    
+    unicode_data
+        .get(codepoint)
+        .map(WbgCharData)
+}
+
+#[wasm_bindgen]
+pub struct EncodedCodepoint {
+    // `wasm-bindgen` unfortunately does not support arrays :(
+    pub b0: u8,
+    pub b1: u8,
+    pub b2: u8,
+    pub b3: u8,
+    pub len: u8,
+}
+
+impl EncodedCodepoint {
+    fn new([b0, b1, b2, b3]: [u8; 4], len: u8) -> Self {
+        Self { b0, b1, b2, b3, len }
+    }
+}