102 lines
4.2 KiB
Rust
102 lines
4.2 KiB
Rust
use serde_json::{json, Value};
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use std::{env, fs, path::PathBuf};
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fn required_string<'a>(meta: &'a Value, key: &str, file: &str) -> &'a str {
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meta.get(key)
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.and_then(Value::as_str)
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.filter(|value| !value.trim().is_empty())
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.unwrap_or_else(|| panic!("{file}: meta.{key} must be a non-empty string"))
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}
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fn main() {
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let manifest_dir = PathBuf::from(env::var("CARGO_MANIFEST_DIR").expect("CARGO_MANIFEST_DIR"));
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let lang_dir = manifest_dir.join("lang");
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println!("cargo:rerun-if-changed={}", lang_dir.display());
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let mut files: Vec<PathBuf> = fs::read_dir(&lang_dir)
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.unwrap_or_else(|error| panic!("cannot read {}: {error}", lang_dir.display()))
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.filter_map(Result::ok)
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.map(|entry| entry.path())
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.filter(|path| path.extension().and_then(|ext| ext.to_str()) == Some("json"))
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.collect();
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files.sort();
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if files.is_empty() {
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panic!("no language files found in {}", lang_dir.display());
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}
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let mut assets = Vec::new();
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let mut manifest_languages = Vec::new();
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let mut has_english = false;
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for path in files {
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println!("cargo:rerun-if-changed={}", path.display());
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let filename = path.file_name().and_then(|v| v.to_str()).expect("UTF-8 language filename");
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let stem = path.file_stem().and_then(|v| v.to_str()).expect("UTF-8 language code");
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if !stem.chars().all(|ch| ch.is_ascii_alphanumeric() || ch == '-' || ch == '_') {
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panic!("{filename}: filename may only contain ASCII letters, digits, '-' and '_'");
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}
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let source = fs::read_to_string(&path)
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.unwrap_or_else(|error| panic!("cannot read {}: {error}", path.display()));
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let document: Value = serde_json::from_str(&source)
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.unwrap_or_else(|error| panic!("{filename}: invalid JSON: {error}"));
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let root_object = document.as_object().unwrap_or_else(|| panic!("{filename}: language pack root must be an object"));
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let unexpected: Vec<&str> = root_object.keys()
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.filter(|key| key.as_str() != "meta" && key.as_str() != "translations")
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.map(|key| key.as_str())
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.collect();
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if !unexpected.is_empty() {
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panic!("{filename}: unexpected top-level keys {:?}; translation keys must be inside 'translations'", unexpected);
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}
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let meta = document.get("meta").unwrap_or_else(|| panic!("{filename}: missing meta object"));
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let code = required_string(meta, "code", filename);
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let name = required_string(meta, "name", filename);
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let native_name = required_string(meta, "native_name", filename);
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let locale = required_string(meta, "locale", filename);
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if code != stem {
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panic!("{filename}: meta.code '{code}' must match filename '{stem}.json'");
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}
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if !document.get("translations").is_some_and(Value::is_object) {
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panic!("{filename}: translations must be a JSON object");
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}
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if code == "en" {
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has_english = true;
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}
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manifest_languages.push(json!({
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"code": code,
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"name": name,
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"native_name": native_name,
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"locale": locale,
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"path": format!("lang/{code}.json")
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}));
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assets.push((code.to_owned(), path));
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}
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if !has_english {
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panic!("lang/en.json is required as the default fallback language");
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}
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let manifest_json = serde_json::to_string(&json!({
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"default": "en",
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"languages": manifest_languages
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})).expect("serialize language manifest");
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let mut generated = String::new();
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generated.push_str("// @generated by build.rs - do not edit.\n");
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generated.push_str(&format!("pub const LANGUAGE_MANIFEST_JSON: &str = {:?};\n", manifest_json));
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generated.push_str("pub const LANGUAGE_ASSETS: &[(&str, &str)] = &[\n");
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for (code, path) in assets {
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generated.push_str(&format!(
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" ({:?}, include_str!({:?})),\n",
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code,
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path.to_string_lossy()
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));
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}
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generated.push_str("];\n");
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let out_dir = PathBuf::from(env::var("OUT_DIR").expect("OUT_DIR"));
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fs::write(out_dir.join("languages.rs"), generated).expect("write generated languages.rs");
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}
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