Web Inspector: Cleanup DebuggerManager, reduce `delete` and use Maps instead of objects

[Matt Baker]

* SUMMARY
Cleanup DebuggerManager, reduce `delete` and use Maps instead of objects.

[Radar WebKit Bug Importer]

<rdar://problem/22954630>

[Matt Baker]

Created attachment 262371 [details]
[Patch] Proposed Fix

[Matt Baker]

No instances of delete to remove (other than those used to remove hashmap object properties), just the switch to using Map.

[Joseph Pecoraro]

Comment on attachment 262371 [details]
[Patch] Proposed Fix

View in context: https://bugs.webkit.org/attachment.cgi?id=262371&action=review

r=me

> Source/WebInspectorUI/UserInterface/Controllers/DebuggerManager.js:280
> +        if (this._breakpointURLMap.has(sourceCode.url)) {
> +            let urlBreakpoints = this._breakpointURLMap.get(sourceCode.url);

I tend to think we should reduce "has" && "get" to just a get.

    let urlBreakpoints = this._breakpointURLMap.get(sourceCode.url);
    if (urlBreakpoints) { ... }

> Source/WebInspectorUI/UserInterface/Controllers/DebuggerManager.js:286
> +        if (sourceCode instanceof WebInspector.Script && this._breakpointScriptIdentifierMap.has(sourceCode.id)) {
> +            let scriptIdentifierBreakpoints = this._breakpointScriptIdentifierMap.get(sourceCode.id);

Same here, but it would involve more rewriting.

> Source/WebInspectorUI/UserInterface/Controllers/DebuggerManager.js:296
> -        return this._breakpointIdMap[id];
> +        return this._breakpointIdMap.get(id);

We probably should do `|| null` here too.

> Source/WebInspectorUI/UserInterface/Controllers/DebuggerManager.js:301
> +        return this._scriptIdMap.get(id);

This should still have `|| null` to return `null` for missing values instead of `undefined`.

[Matt Baker]

Created attachment 262374 [details]
[Patch] For Landing

[WebKit Commit Bot]

Comment on attachment 262374 [details]
[Patch] For Landing

Clearing flags on attachment: 262374

Committed r190540: <http://trac.webkit.org/changeset/190540>

[WebKit Commit Bot]

All reviewed patches have been landed.  Closing bug.