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external/cmapscompress/parse.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.
+ */
+
+function parseAdobeCMap(content) {
+  let m = /(\bbegincmap\b[\s\S]*?)\bendcmap\b/.exec(content);
+  if (!m) {
+    throw new Error("cmap was not found");
+  }
+
+  const body = m[1].replaceAll(/\r\n?/g, "\n");
+  const result = {
+    type: 1,
+    wmode: 0,
+    comment:
+      "Copyright 1990-2009 Adobe Systems Incorporated.\nAll rights reserved.\nSee ./LICENSE",
+    usecmap: null,
+    body: [],
+  };
+  m = /\/CMapType\s+(\d+)\s+def\b/.exec(body);
+  result.type = +m[1];
+  m = /\/WMode\s+(\d+)\s+def\b/.exec(body);
+  result.wmode = +m[1];
+  m = /\/([\w-]+)\s+usecmap\b/.exec(body);
+  if (m) {
+    result.usecmap = m[1];
+  }
+  const re =
+    /(\d+)\s+(begincodespacerange|beginnotdefrange|begincidchar|begincidrange|beginbfchar|beginbfrange)\n([\s\S]*?)\n(endcodespacerange|endnotdefrange|endcidchar|endcidrange|endbfchar|endbfrange)/g;
+  while ((m = re.exec(body))) {
+    const lines = m[3].toLowerCase().split("\n");
+
+    switch (m[2]) {
+      case "begincodespacerange":
+        result.body.push({
+          type: 0,
+          items: lines.map(function (line) {
+            const m2 = /<(\w+)>\s+<(\w+)>/.exec(line);
+            return { start: m2[1], end: m2[2] };
+          }),
+        });
+        break;
+      case "beginnotdefrange":
+        result.body.push({
+          type: 1,
+          items: lines.map(function (line) {
+            const m2 = /<(\w+)>\s+<(\w+)>\s+(\d+)/.exec(line);
+            return { start: m2[1], end: m2[2], code: +m2[3] };
+          }),
+        });
+        break;
+      case "begincidchar":
+        result.body.push({
+          type: 2,
+          items: lines.map(function (line) {
+            const m2 = /<(\w+)>\s+(\d+)/.exec(line);
+            return { char: m2[1], code: +m2[2] };
+          }),
+        });
+        break;
+      case "begincidrange":
+        result.body.push({
+          type: 3,
+          items: lines.map(function (line) {
+            const m2 = /<(\w+)>\s+<(\w+)>\s+(\d+)/.exec(line);
+            return { start: m2[1], end: m2[2], code: +m2[3] };
+          }),
+        });
+        break;
+      case "beginbfchar":
+        result.body.push({
+          type: 4,
+          items: lines.map(function (line) {
+            const m2 = /<(\w+)>\s+<(\w+)>/.exec(line);
+            return { char: m2[1], code: m2[2] };
+          }),
+        });
+        break;
+      case "beginbfrange":
+        result.body.push({
+          type: 5,
+          items: lines.map(function (line) {
+            const m2 = /<(\w+)>\s+<(\w+)>\s+<(\w+)>/.exec(line);
+            return { start: m2[1], end: m2[2], code: m2[3] };
+          }),
+        });
+        break;
+    }
+  }
+
+  return result;
+}
+
+export { parseAdobeCMap };