1 files changed, 37 insertions, 0 deletions
diff --git a/devtools/client/debugger/src/utils/function.js b/devtools/client/debugger/src/utils/function.js
new file mode 100644
index 0000000000..39d0f5a9a7
--- /dev/null
+++ b/devtools/client/debugger/src/utils/function.js
@@ -0,0 +1,37 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at <http://mozilla.org/MPL/2.0/>. */
+
+import { isFulfilled } from "./async-value";
+import { findClosestFunction } from "./ast";
+import { correctIndentation } from "./indentation";
+
+export function findFunctionText(line, source, sourceTextContent, symbols) {
+  const func = findClosestFunction(symbols, {
+    sourceId: source.id,
+    line,
+    column: Infinity,
+  });
+
+  if (
+    source.isWasm ||
+    !func ||
+    !sourceTextContent ||
+    !isFulfilled(sourceTextContent) ||
+    sourceTextContent.value.type !== "text"
+  ) {
+    return null;
+  }
+
+  const {
+    location: { start, end },
+  } = func;
+  const lines = sourceTextContent.value.value.split("\n");
+  const firstLine = lines[start.line - 1].slice(start.column);
+  const lastLine = lines[end.line - 1].slice(0, end.column);
+  const middle = lines.slice(start.line, end.line - 1);
+  const functionText = [firstLine, ...middle, lastLine].join("\n");
+  const indentedFunctionText = correctIndentation(functionText);
+
+  return indentedFunctionText;
+}