1 files changed, 186 insertions, 0 deletions
diff --git a/Source/WebInspectorUI/UserInterface/Controllers/SourceMapManager.js b/Source/WebInspectorUI/UserInterface/Controllers/SourceMapManager.js
new file mode 100644
index 000000000..6bb8cefba
--- /dev/null
+++ b/Source/WebInspectorUI/UserInterface/Controllers/SourceMapManager.js
@@ -0,0 +1,186 @@
+/*
+ * Copyright (C) 2013 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+WebInspector.SourceMapManager = class SourceMapManager extends WebInspector.Object
+{
+    constructor()
+    {
+        super();
+
+        this._sourceMapURLMap = {};
+        this._downloadingSourceMaps = {};
+
+        WebInspector.Frame.addEventListener(WebInspector.Frame.Event.MainResourceDidChange, this._mainResourceDidChange, this);
+    }
+
+    // Public
+
+    sourceMapForURL(sourceMapURL)
+    {
+        return this._sourceMapURLMap[sourceMapURL];
+    }
+
+    downloadSourceMap(sourceMapURL, baseURL, originalSourceCode)
+    {
+        // The baseURL could have come from a "//# sourceURL". Attempt to get a
+        // reasonable absolute URL for the base by using the main resource's URL.
+        if (WebInspector.frameResourceManager.mainFrame)
+            baseURL = absoluteURL(baseURL, WebInspector.frameResourceManager.mainFrame.url);
+
+        if (sourceMapURL.startsWith("data:")) {
+            this._loadAndParseSourceMap(sourceMapURL, baseURL, originalSourceCode);
+            return;
+        }
+
+        sourceMapURL = absoluteURL(sourceMapURL, baseURL);
+        if (!sourceMapURL)
+            return;
+
+        console.assert(originalSourceCode.url);
+        if (!originalSourceCode.url)
+            return;
+
+        // FIXME: <rdar://problem/13265694> Source Maps: Better handle when multiple resources reference the same SourceMap
+
+        if (sourceMapURL in this._sourceMapURLMap)
+            return;
+
+        if (sourceMapURL in this._downloadingSourceMaps)
+            return;
+
+        function loadAndParseSourceMap()
+        {
+            this._loadAndParseSourceMap(sourceMapURL, baseURL, originalSourceCode);
+        }
+
+        if (!WebInspector.frameResourceManager.mainFrame) {
+            // If we don't have a main frame, then we are likely in the middle of building the resource tree.
+            // Delaying until the next runloop is enough in this case to then start loading the source map.
+            setTimeout(loadAndParseSourceMap.bind(this), 0);
+            return;
+        }
+
+        loadAndParseSourceMap.call(this);
+    }
+
+    // Private
+
+    _loadAndParseSourceMap(sourceMapURL, baseURL, originalSourceCode)
+    {
+        this._downloadingSourceMaps[sourceMapURL] = true;
+
+        function sourceMapLoaded(error, content, mimeType, statusCode)
+        {
+            if (error || statusCode >= 400) {
+                this._loadAndParseFailed(sourceMapURL);
+                return;
+            }
+
+            if (content.slice(0, 3) === ")]}") {
+                var firstNewlineIndex = content.indexOf("\n");
+                if (firstNewlineIndex === -1) {
+                    this._loadAndParseFailed(sourceMapURL);
+                    return;
+                }
+
+                content = content.substring(firstNewlineIndex);
+            }
+
+            try {
+                var payload = JSON.parse(content);
+                var baseURL = sourceMapURL.startsWith("data:") ? originalSourceCode.url : sourceMapURL;
+                var sourceMap = new WebInspector.SourceMap(baseURL, payload, originalSourceCode);
+                this._loadAndParseSucceeded(sourceMapURL, sourceMap);
+            } catch (e) {
+                this._loadAndParseFailed(sourceMapURL);
+            }
+        }
+
+        if (sourceMapURL.startsWith("data:")) {
+            let {mimeType, base64, data} = parseDataURL(sourceMapURL);
+            let content = base64 ? atob(data) : data;
+            sourceMapLoaded.call(this, null, content, mimeType, 0);
+            return;
+        }
+
+        // COMPATIBILITY (iOS 7): Network.loadResource did not exist.
+        // Also, JavaScript Debuggable may reach this.
+        if (!window.NetworkAgent || !NetworkAgent.loadResource) {
+            this._loadAndParseFailed(sourceMapURL);
+            return;
+        }
+
+        var frameIdentifier = null;
+        if (originalSourceCode instanceof WebInspector.Resource && originalSourceCode.parentFrame)
+            frameIdentifier = originalSourceCode.parentFrame.id;
+
+        if (!frameIdentifier)
+            frameIdentifier = WebInspector.frameResourceManager.mainFrame.id;
+
+        NetworkAgent.loadResource(frameIdentifier, sourceMapURL, sourceMapLoaded.bind(this));
+    }
+
+    _loadAndParseFailed(sourceMapURL)
+    {
+        delete this._downloadingSourceMaps[sourceMapURL];
+    }
+
+    _loadAndParseSucceeded(sourceMapURL, sourceMap)
+    {
+        if (!(sourceMapURL in this._downloadingSourceMaps))
+            return;
+
+        delete this._downloadingSourceMaps[sourceMapURL];
+
+        this._sourceMapURLMap[sourceMapURL] = sourceMap;
+
+        var sources = sourceMap.sources();
+        for (var i = 0; i < sources.length; ++i) {
+            var sourceMapResource = new WebInspector.SourceMapResource(sources[i], sourceMap);
+            sourceMap.addResource(sourceMapResource);
+        }
+
+        // Associate the SourceMap with the originalSourceCode.
+        sourceMap.originalSourceCode.addSourceMap(sourceMap);
+
+        // If the originalSourceCode was not a Resource, be sure to also associate with the Resource if one exists.
+        // FIXME: We should try to use the right frame instead of a global lookup by URL.
+        if (!(sourceMap.originalSourceCode instanceof WebInspector.Resource)) {
+            console.assert(sourceMap.originalSourceCode instanceof WebInspector.Script);
+            var resource = sourceMap.originalSourceCode.resource;
+            if (resource)
+                resource.addSourceMap(sourceMap);
+        }
+    }
+
+    _mainResourceDidChange(event)
+    {
+        if (!event.target.isMainFrame())
+            return;
+
+        this._sourceMapURLMap = {};
+        this._downloadingSourceMaps = {};
+    }
+};