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test/font/ttxdriver.mjs

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