46 lines
2 KiB
JavaScript
46 lines
2 KiB
JavaScript
#!/usr/bin/env node
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// Converts locales/en-US/main.ftl into web/locales/en-US.json: a flat
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// id -> string dictionary the browser can fetch with no parser of its own.
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//
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// Deliberately hand-rolled rather than a dependency on @fluent/syntax: the
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// source file only ever uses Fluent's simplest shape (comments, flat
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// `id = value` messages, `{ $var }` references, and `{"literal"}` string
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// inserts for embedded newlines) — confirmed by grep before writing this,
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// not assumed. If the file ever gains a select expression, a term, or a
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// multiline value, this script will need to grow with it; until then a
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// real parser is more dependency than the input justifies.
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import { readFileSync, writeFileSync, mkdirSync } from "node:fs";
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import { dirname, join } from "node:path";
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import { fileURLToPath } from "node:url";
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const root = dirname(dirname(fileURLToPath(import.meta.url)));
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const srcPath = join(root, "locales/en-US/main.ftl");
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const outPath = join(root, "web/locales/en-US.json");
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const MESSAGE = /^([a-zA-Z][a-zA-Z0-9_-]*)\s*=\s*(.*)$/;
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// A Fluent string literal, e.g. {"\u000A"} — only used in this file to
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// embed a literal newline inside an otherwise single-line value.
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const LITERAL = /\{"((?:[^"\\]|\\.)*)"\}/g;
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function unescapeLiteral(text) {
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return text.replace(/\\u([0-9a-fA-F]{4})/g, (_, hex) => String.fromCharCode(parseInt(hex, 16)))
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.replace(/\\(.)/g, "$1");
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}
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function parseFtl(text) {
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const messages = {};
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for (const line of text.split("\n")) {
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if (!line || line.startsWith("#")) continue; // blank line or comment
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const match = MESSAGE.exec(line);
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if (!match) continue;
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const [, id, rawValue] = match;
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messages[id] = rawValue.replace(LITERAL, (_, inner) => unescapeLiteral(inner));
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}
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return messages;
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}
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const messages = parseFtl(readFileSync(srcPath, "utf8"));
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mkdirSync(dirname(outPath), { recursive: true });
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writeFileSync(outPath, JSON.stringify(messages, null, 2) + "\n");
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console.log(`wrote ${Object.keys(messages).length} messages to ${outPath}`);
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