ac03d7054d
This commit removes the final callbacks in this code by switching to a promises-based interface, overall simplifying the code. Moreover, we document why we write to files on disk and modernize the code using e.g. template strings.
72 lines
2.0 KiB
JavaScript
72 lines
2.0 KiB
JavaScript
/*
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* Copyright 2014 Mozilla Foundation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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import fs from "fs";
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import os from "os";
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import path from "path";
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import { spawn } from "child_process";
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let ttxTaskId = Date.now();
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function runTtx(fontPath) {
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return new Promise((resolve, reject) => {
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const ttx = spawn("ttx", [fontPath], { stdio: "ignore" });
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ttx.on("error", () => {
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reject(
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new Error(
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"Unable to execute `ttx`; make sure the `fonttools` dependency is installed"
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)
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);
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});
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ttx.on("close", () => {
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resolve();
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});
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});
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}
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async function translateFont(content) {
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const buffer = Buffer.from(content, "base64");
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const taskId = (ttxTaskId++).toString();
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const fontPath = path.join(os.tmpdir(), `pdfjs-font-test-${taskId}.otf`);
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const resultPath = path.join(os.tmpdir(), `pdfjs-font-test-${taskId}.ttx`);
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// Write the font data to a temporary file on disk (because TTX only accepts
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// files as input).
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fs.writeFileSync(fontPath, buffer);
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// Run TTX on the temporary font file.
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let ttxError;
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try {
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await runTtx(fontPath);
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} catch (error) {
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ttxError = error;
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}
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// Remove the temporary font/result files and report on the outcome.
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fs.unlinkSync(fontPath);
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if (ttxError) {
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throw ttxError;
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}
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if (!fs.existsSync(resultPath)) {
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throw new Error("TTX did not generate output");
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}
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const xml = fs.readFileSync(resultPath);
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fs.unlinkSync(resultPath);
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return xml;
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}
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export { translateFont };
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