1 files changed, 138 insertions, 0 deletions
diff --git a/devtools/client/debugger/src/components/Editor/BlackboxLines.js b/devtools/client/debugger/src/components/Editor/BlackboxLines.js
new file mode 100644
index 0000000000..c81db9c598
--- /dev/null
+++ b/devtools/client/debugger/src/components/Editor/BlackboxLines.js
@@ -0,0 +1,138 @@
+/* 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 PropTypes from "prop-types";
+import { Component } from "react";
+import { toEditorLine, fromEditorLine } from "../../utils/editor";
+import { isLineBlackboxed } from "../../utils/source";
+import { isWasm } from "../../utils/wasm";
+
+// This renders blackbox line highlighting in the editor
+class BlackboxLines extends Component {
+  static get propTypes() {
+    return {
+      editor: PropTypes.object.isRequired,
+      selectedSource: PropTypes.object.isRequired,
+      blackboxedRangesForSelectedSource: PropTypes.array,
+      isSourceOnIgnoreList: PropTypes.bool,
+    };
+  }
+
+  componentDidMount() {
+    const { selectedSource, blackboxedRangesForSelectedSource, editor } =
+      this.props;
+
+    if (this.props.isSourceOnIgnoreList) {
+      this.setAllBlackboxLines(editor);
+      return;
+    }
+
+    // When `blackboxedRangesForSelectedSource` is defined and the array is empty,
+    // the whole source was blackboxed.
+    if (!blackboxedRangesForSelectedSource.length) {
+      this.setAllBlackboxLines(editor);
+    } else {
+      editor.codeMirror.operation(() => {
+        blackboxedRangesForSelectedSource.forEach(range => {
+          const start = toEditorLine(selectedSource.id, range.start.line);
+          const end = toEditorLine(selectedSource.id, range.end.line);
+          editor.codeMirror.eachLine(start, end, lineHandle => {
+            this.setBlackboxLine(editor, lineHandle);
+          });
+        });
+      });
+    }
+  }
+
+  componentDidUpdate() {
+    const {
+      selectedSource,
+      blackboxedRangesForSelectedSource,
+      editor,
+      isSourceOnIgnoreList,
+    } = this.props;
+
+    if (this.props.isSourceOnIgnoreList) {
+      this.setAllBlackboxLines(editor);
+      return;
+    }
+
+    // when unblackboxed
+    if (!blackboxedRangesForSelectedSource) {
+      this.clearAllBlackboxLines(editor);
+      return;
+    }
+
+    // When the whole source is blackboxed
+    if (!blackboxedRangesForSelectedSource.length) {
+      this.setAllBlackboxLines(editor);
+      return;
+    }
+
+    const sourceIsWasm = isWasm(selectedSource.id);
+
+    // TODO: Possible perf improvement. Instead of going
+    // over all the lines each time get diffs of what has
+    // changed and update those.
+    editor.codeMirror.operation(() => {
+      editor.codeMirror.eachLine(lineHandle => {
+        const line = fromEditorLine(
+          selectedSource.id,
+          editor.codeMirror.getLineNumber(lineHandle),
+          sourceIsWasm
+        );
+
+        if (
+          isLineBlackboxed(
+            blackboxedRangesForSelectedSource,
+            line,
+            isSourceOnIgnoreList
+          )
+        ) {
+          this.setBlackboxLine(editor, lineHandle);
+        } else {
+          this.clearBlackboxLine(editor, lineHandle);
+        }
+      });
+    });
+  }
+
+  componentWillUnmount() {
+    // Lets make sure we remove everything  relating to
+    // blackboxing lines when this component is unmounted.
+    this.clearAllBlackboxLines(this.props.editor);
+  }
+
+  clearAllBlackboxLines(editor) {
+    editor.codeMirror.operation(() => {
+      editor.codeMirror.eachLine(lineHandle => {
+        this.clearBlackboxLine(editor, lineHandle);
+      });
+    });
+  }
+
+  setAllBlackboxLines(editor) {
+    //TODO:We might be able to handle the whole source
+    // than adding the blackboxing line by line
+    editor.codeMirror.operation(() => {
+      editor.codeMirror.eachLine(lineHandle => {
+        this.setBlackboxLine(editor, lineHandle);
+      });
+    });
+  }
+
+  clearBlackboxLine(editor, lineHandle) {
+    editor.codeMirror.removeLineClass(lineHandle, "wrap", "blackboxed-line");
+  }
+
+  setBlackboxLine(editor, lineHandle) {
+    editor.codeMirror.addLineClass(lineHandle, "wrap", "blackboxed-line");
+  }
+
+  render() {
+    return null;
+  }
+}
+
+export default BlackboxLines;