1 files changed, 44 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..a32bd95fac
--- /dev/null
+++ b/devtools/client/debugger/src/utils/function.js
@@ -0,0 +1,44 @@
+/* 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/>. */
+
+// @flow
+import { isFulfilled } from "./async-value";
+import { findClosestFunction } from "./ast";
+import { correctIndentation } from "./indentation";
+import type { SourceWithContent } from "../types";
+import type { Symbols } from "../reducers/ast";
+
+export function findFunctionText(
+  line: number,
+  source: SourceWithContent,
+  symbols: ?Symbols
+): ?string {
+  const func = findClosestFunction(symbols, {
+    sourceId: source.id,
+    line,
+    column: Infinity,
+  });
+
+  if (
+    source.isWasm ||
+    !func ||
+    !source.content ||
+    !isFulfilled(source.content) ||
+    source.content.value.type !== "text"
+  ) {
+    return null;
+  }
+
+  const {
+    location: { start, end },
+  } = func;
+  const lines = source.content.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;
+}